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 const struct bus_type iscsi_flashnode_bus;
1205
iscsi_flashnode_bus_match(struct device * dev,const struct device_driver * drv)1206 int iscsi_flashnode_bus_match(struct device *dev,
1207 const 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 const 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 queue_limits lim;
1539 struct request_queue *q;
1540 char bsg_name[20];
1541
1542 if (!i->iscsi_transport->bsg_request)
1543 return -ENOTSUPP;
1544
1545 snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1546 scsi_init_limits(shost, &lim);
1547 q = bsg_setup_queue(dev, bsg_name, &lim, iscsi_bsg_host_dispatch, NULL,
1548 0);
1549 if (IS_ERR(q)) {
1550 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1551 "initialize - no request queue\n");
1552 return PTR_ERR(q);
1553 }
1554
1555 ihost->bsg_q = q;
1556 return 0;
1557 }
1558
iscsi_setup_host(struct transport_container * tc,struct device * dev,struct device * cdev)1559 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1560 struct device *cdev)
1561 {
1562 struct Scsi_Host *shost = dev_to_shost(dev);
1563 struct iscsi_cls_host *ihost = shost->shost_data;
1564
1565 memset(ihost, 0, sizeof(*ihost));
1566 mutex_init(&ihost->mutex);
1567
1568 iscsi_bsg_host_add(shost, ihost);
1569 /* ignore any bsg add error - we just can't do sgio */
1570
1571 return 0;
1572 }
1573
iscsi_remove_host(struct transport_container * tc,struct device * dev,struct device * cdev)1574 static int iscsi_remove_host(struct transport_container *tc,
1575 struct device *dev, struct device *cdev)
1576 {
1577 struct Scsi_Host *shost = dev_to_shost(dev);
1578 struct iscsi_cls_host *ihost = shost->shost_data;
1579
1580 bsg_remove_queue(ihost->bsg_q);
1581 return 0;
1582 }
1583
1584 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1585 "iscsi_host",
1586 iscsi_setup_host,
1587 iscsi_remove_host,
1588 NULL);
1589
1590 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1591 "iscsi_session",
1592 NULL,
1593 NULL,
1594 NULL);
1595
1596 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1597 "iscsi_connection",
1598 NULL,
1599 NULL,
1600 NULL);
1601
1602 static struct sock *nls;
1603 static DEFINE_MUTEX(rx_queue_mutex);
1604
1605 static LIST_HEAD(sesslist);
1606 static DEFINE_SPINLOCK(sesslock);
1607 static LIST_HEAD(connlist);
1608 static DEFINE_SPINLOCK(connlock);
1609
iscsi_conn_get_sid(struct iscsi_cls_conn * conn)1610 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1611 {
1612 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1613 return sess->sid;
1614 }
1615
1616 /*
1617 * Returns the matching session to a given sid
1618 */
iscsi_session_lookup(uint32_t sid)1619 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1620 {
1621 unsigned long flags;
1622 struct iscsi_cls_session *sess;
1623
1624 spin_lock_irqsave(&sesslock, flags);
1625 list_for_each_entry(sess, &sesslist, sess_list) {
1626 if (sess->sid == sid) {
1627 spin_unlock_irqrestore(&sesslock, flags);
1628 return sess;
1629 }
1630 }
1631 spin_unlock_irqrestore(&sesslock, flags);
1632 return NULL;
1633 }
1634
1635 /*
1636 * Returns the matching connection to a given sid / cid tuple
1637 */
iscsi_conn_lookup(uint32_t sid,uint32_t cid)1638 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1639 {
1640 unsigned long flags;
1641 struct iscsi_cls_conn *conn;
1642
1643 spin_lock_irqsave(&connlock, flags);
1644 list_for_each_entry(conn, &connlist, conn_list) {
1645 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1646 spin_unlock_irqrestore(&connlock, flags);
1647 return conn;
1648 }
1649 }
1650 spin_unlock_irqrestore(&connlock, flags);
1651 return NULL;
1652 }
1653
1654 /*
1655 * The following functions can be used by LLDs that allocate
1656 * their own scsi_hosts or by software iscsi LLDs
1657 */
1658 static struct {
1659 int value;
1660 char *name;
1661 } iscsi_session_state_names[] = {
1662 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
1663 { ISCSI_SESSION_FAILED, "FAILED" },
1664 { ISCSI_SESSION_FREE, "FREE" },
1665 };
1666
iscsi_session_state_name(int state)1667 static const char *iscsi_session_state_name(int state)
1668 {
1669 int i;
1670 char *name = NULL;
1671
1672 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1673 if (iscsi_session_state_names[i].value == state) {
1674 name = iscsi_session_state_names[i].name;
1675 break;
1676 }
1677 }
1678 return name;
1679 }
1680
1681 static char *iscsi_session_target_state_name[] = {
1682 [ISCSI_SESSION_TARGET_UNBOUND] = "UNBOUND",
1683 [ISCSI_SESSION_TARGET_ALLOCATED] = "ALLOCATED",
1684 [ISCSI_SESSION_TARGET_SCANNED] = "SCANNED",
1685 [ISCSI_SESSION_TARGET_UNBINDING] = "UNBINDING",
1686 };
1687
iscsi_session_chkready(struct iscsi_cls_session * session)1688 int iscsi_session_chkready(struct iscsi_cls_session *session)
1689 {
1690 int err;
1691
1692 switch (session->state) {
1693 case ISCSI_SESSION_LOGGED_IN:
1694 err = 0;
1695 break;
1696 case ISCSI_SESSION_FAILED:
1697 err = DID_IMM_RETRY << 16;
1698 break;
1699 case ISCSI_SESSION_FREE:
1700 err = DID_TRANSPORT_FAILFAST << 16;
1701 break;
1702 default:
1703 err = DID_NO_CONNECT << 16;
1704 break;
1705 }
1706 return err;
1707 }
1708 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1709
iscsi_is_session_online(struct iscsi_cls_session * session)1710 int iscsi_is_session_online(struct iscsi_cls_session *session)
1711 {
1712 unsigned long flags;
1713 int ret = 0;
1714
1715 spin_lock_irqsave(&session->lock, flags);
1716 if (session->state == ISCSI_SESSION_LOGGED_IN)
1717 ret = 1;
1718 spin_unlock_irqrestore(&session->lock, flags);
1719 return ret;
1720 }
1721 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1722
iscsi_session_release(struct device * dev)1723 static void iscsi_session_release(struct device *dev)
1724 {
1725 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1726 struct Scsi_Host *shost;
1727
1728 shost = iscsi_session_to_shost(session);
1729 scsi_host_put(shost);
1730 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1731 kfree(session);
1732 }
1733
iscsi_is_session_dev(const struct device * dev)1734 int iscsi_is_session_dev(const struct device *dev)
1735 {
1736 return dev->release == iscsi_session_release;
1737 }
1738 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1739
iscsi_iter_session_fn(struct device * dev,void * data)1740 static int iscsi_iter_session_fn(struct device *dev, void *data)
1741 {
1742 void (* fn) (struct iscsi_cls_session *) = data;
1743
1744 if (!iscsi_is_session_dev(dev))
1745 return 0;
1746 fn(iscsi_dev_to_session(dev));
1747 return 0;
1748 }
1749
iscsi_host_for_each_session(struct Scsi_Host * shost,void (* fn)(struct iscsi_cls_session *))1750 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1751 void (*fn)(struct iscsi_cls_session *))
1752 {
1753 device_for_each_child(&shost->shost_gendev, fn,
1754 iscsi_iter_session_fn);
1755 }
1756 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1757
1758 struct iscsi_scan_data {
1759 unsigned int channel;
1760 unsigned int id;
1761 u64 lun;
1762 enum scsi_scan_mode rescan;
1763 };
1764
iscsi_user_scan_session(struct device * dev,void * data)1765 static int iscsi_user_scan_session(struct device *dev, void *data)
1766 {
1767 struct iscsi_scan_data *scan_data = data;
1768 struct iscsi_cls_session *session;
1769 struct Scsi_Host *shost;
1770 struct iscsi_cls_host *ihost;
1771 unsigned long flags;
1772 unsigned int id;
1773
1774 if (!iscsi_is_session_dev(dev))
1775 return 0;
1776
1777 session = iscsi_dev_to_session(dev);
1778
1779 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1780
1781 shost = iscsi_session_to_shost(session);
1782 ihost = shost->shost_data;
1783
1784 mutex_lock(&ihost->mutex);
1785 spin_lock_irqsave(&session->lock, flags);
1786 if (session->state != ISCSI_SESSION_LOGGED_IN) {
1787 spin_unlock_irqrestore(&session->lock, flags);
1788 goto user_scan_exit;
1789 }
1790 id = session->target_id;
1791 spin_unlock_irqrestore(&session->lock, flags);
1792
1793 if (id != ISCSI_MAX_TARGET) {
1794 if ((scan_data->channel == SCAN_WILD_CARD ||
1795 scan_data->channel == 0) &&
1796 (scan_data->id == SCAN_WILD_CARD ||
1797 scan_data->id == id)) {
1798 scsi_scan_target(&session->dev, 0, id,
1799 scan_data->lun, scan_data->rescan);
1800 spin_lock_irqsave(&session->lock, flags);
1801 session->target_state = ISCSI_SESSION_TARGET_SCANNED;
1802 spin_unlock_irqrestore(&session->lock, flags);
1803 }
1804 }
1805
1806 user_scan_exit:
1807 mutex_unlock(&ihost->mutex);
1808 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1809 return 0;
1810 }
1811
iscsi_user_scan(struct Scsi_Host * shost,uint channel,uint id,u64 lun)1812 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1813 uint id, u64 lun)
1814 {
1815 struct iscsi_scan_data scan_data;
1816
1817 scan_data.channel = channel;
1818 scan_data.id = id;
1819 scan_data.lun = lun;
1820 scan_data.rescan = SCSI_SCAN_MANUAL;
1821
1822 return device_for_each_child(&shost->shost_gendev, &scan_data,
1823 iscsi_user_scan_session);
1824 }
1825
iscsi_scan_session(struct work_struct * work)1826 static void iscsi_scan_session(struct work_struct *work)
1827 {
1828 struct iscsi_cls_session *session =
1829 container_of(work, struct iscsi_cls_session, scan_work);
1830 struct iscsi_scan_data scan_data;
1831
1832 scan_data.channel = 0;
1833 scan_data.id = SCAN_WILD_CARD;
1834 scan_data.lun = SCAN_WILD_CARD;
1835 scan_data.rescan = SCSI_SCAN_RESCAN;
1836
1837 iscsi_user_scan_session(&session->dev, &scan_data);
1838 }
1839
1840 /**
1841 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1842 * @cmd: scsi cmd passed to scsi eh handler
1843 *
1844 * If the session is down this function will wait for the recovery
1845 * timer to fire or for the session to be logged back in. If the
1846 * recovery timer fires then FAST_IO_FAIL is returned. The caller
1847 * should pass this error value to the scsi eh.
1848 */
iscsi_block_scsi_eh(struct scsi_cmnd * cmd)1849 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1850 {
1851 struct iscsi_cls_session *session =
1852 starget_to_session(scsi_target(cmd->device));
1853 unsigned long flags;
1854 int ret = 0;
1855
1856 spin_lock_irqsave(&session->lock, flags);
1857 while (session->state != ISCSI_SESSION_LOGGED_IN) {
1858 if (session->state == ISCSI_SESSION_FREE) {
1859 ret = FAST_IO_FAIL;
1860 break;
1861 }
1862 spin_unlock_irqrestore(&session->lock, flags);
1863 msleep(1000);
1864 spin_lock_irqsave(&session->lock, flags);
1865 }
1866 spin_unlock_irqrestore(&session->lock, flags);
1867 return ret;
1868 }
1869 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1870
session_recovery_timedout(struct work_struct * work)1871 static void session_recovery_timedout(struct work_struct *work)
1872 {
1873 struct iscsi_cls_session *session =
1874 container_of(work, struct iscsi_cls_session,
1875 recovery_work.work);
1876 unsigned long flags;
1877
1878 iscsi_cls_session_printk(KERN_INFO, session,
1879 "session recovery timed out after %d secs\n",
1880 session->recovery_tmo);
1881
1882 spin_lock_irqsave(&session->lock, flags);
1883 switch (session->state) {
1884 case ISCSI_SESSION_FAILED:
1885 session->state = ISCSI_SESSION_FREE;
1886 break;
1887 case ISCSI_SESSION_LOGGED_IN:
1888 case ISCSI_SESSION_FREE:
1889 /* we raced with the unblock's flush */
1890 spin_unlock_irqrestore(&session->lock, flags);
1891 return;
1892 }
1893 spin_unlock_irqrestore(&session->lock, flags);
1894
1895 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1896 scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1897 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1898
1899 if (session->transport->session_recovery_timedout)
1900 session->transport->session_recovery_timedout(session);
1901 }
1902
__iscsi_unblock_session(struct work_struct * work)1903 static void __iscsi_unblock_session(struct work_struct *work)
1904 {
1905 struct iscsi_cls_session *session =
1906 container_of(work, struct iscsi_cls_session,
1907 unblock_work);
1908 unsigned long flags;
1909
1910 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1911
1912 cancel_delayed_work_sync(&session->recovery_work);
1913 spin_lock_irqsave(&session->lock, flags);
1914 session->state = ISCSI_SESSION_LOGGED_IN;
1915 spin_unlock_irqrestore(&session->lock, flags);
1916 /* start IO */
1917 scsi_target_unblock(&session->dev, SDEV_RUNNING);
1918 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1919 }
1920
1921 /**
1922 * iscsi_unblock_session - set a session as logged in and start IO.
1923 * @session: iscsi session
1924 *
1925 * Mark a session as ready to accept IO.
1926 */
iscsi_unblock_session(struct iscsi_cls_session * session)1927 void iscsi_unblock_session(struct iscsi_cls_session *session)
1928 {
1929 if (!cancel_work_sync(&session->block_work))
1930 cancel_delayed_work_sync(&session->recovery_work);
1931
1932 queue_work(session->workq, &session->unblock_work);
1933 /*
1934 * Blocking the session can be done from any context so we only
1935 * queue the block work. Make sure the unblock work has completed
1936 * because it flushes/cancels the other works and updates the state.
1937 */
1938 flush_work(&session->unblock_work);
1939 }
1940 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1941
__iscsi_block_session(struct work_struct * work)1942 static void __iscsi_block_session(struct work_struct *work)
1943 {
1944 struct iscsi_cls_session *session =
1945 container_of(work, struct iscsi_cls_session,
1946 block_work);
1947 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1948 unsigned long flags;
1949
1950 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1951 spin_lock_irqsave(&session->lock, flags);
1952 session->state = ISCSI_SESSION_FAILED;
1953 spin_unlock_irqrestore(&session->lock, flags);
1954 scsi_block_targets(shost, &session->dev);
1955 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1956 if (session->recovery_tmo >= 0)
1957 queue_delayed_work(session->workq,
1958 &session->recovery_work,
1959 session->recovery_tmo * HZ);
1960 }
1961
iscsi_block_session(struct iscsi_cls_session * session)1962 void iscsi_block_session(struct iscsi_cls_session *session)
1963 {
1964 queue_work(session->workq, &session->block_work);
1965 }
1966 EXPORT_SYMBOL_GPL(iscsi_block_session);
1967
__iscsi_unbind_session(struct work_struct * work)1968 static void __iscsi_unbind_session(struct work_struct *work)
1969 {
1970 struct iscsi_cls_session *session =
1971 container_of(work, struct iscsi_cls_session,
1972 unbind_work);
1973 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1974 struct iscsi_cls_host *ihost = shost->shost_data;
1975 unsigned long flags;
1976 unsigned int target_id;
1977 bool remove_target = true;
1978
1979 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1980
1981 /* Prevent new scans and make sure scanning is not in progress */
1982 mutex_lock(&ihost->mutex);
1983 spin_lock_irqsave(&session->lock, flags);
1984 if (session->target_state == ISCSI_SESSION_TARGET_ALLOCATED) {
1985 remove_target = false;
1986 } else if (session->target_state != ISCSI_SESSION_TARGET_SCANNED) {
1987 spin_unlock_irqrestore(&session->lock, flags);
1988 mutex_unlock(&ihost->mutex);
1989 ISCSI_DBG_TRANS_SESSION(session,
1990 "Skipping target unbinding: Session is unbound/unbinding.\n");
1991 return;
1992 }
1993
1994 session->target_state = ISCSI_SESSION_TARGET_UNBINDING;
1995 target_id = session->target_id;
1996 session->target_id = ISCSI_MAX_TARGET;
1997 spin_unlock_irqrestore(&session->lock, flags);
1998 mutex_unlock(&ihost->mutex);
1999
2000 if (remove_target)
2001 scsi_remove_target(&session->dev);
2002
2003 if (session->ida_used)
2004 ida_free(&iscsi_sess_ida, target_id);
2005
2006 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2007 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2008
2009 spin_lock_irqsave(&session->lock, flags);
2010 session->target_state = ISCSI_SESSION_TARGET_UNBOUND;
2011 spin_unlock_irqrestore(&session->lock, flags);
2012 }
2013
__iscsi_destroy_session(struct work_struct * work)2014 static void __iscsi_destroy_session(struct work_struct *work)
2015 {
2016 struct iscsi_cls_session *session =
2017 container_of(work, struct iscsi_cls_session, destroy_work);
2018
2019 session->transport->destroy_session(session);
2020 }
2021
2022 struct iscsi_cls_session *
iscsi_alloc_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size)2023 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2024 int dd_size)
2025 {
2026 struct iscsi_cls_session *session;
2027
2028 session = kzalloc(sizeof(*session) + dd_size,
2029 GFP_KERNEL);
2030 if (!session)
2031 return NULL;
2032
2033 session->transport = transport;
2034 session->creator = -1;
2035 session->recovery_tmo = 120;
2036 session->recovery_tmo_sysfs_override = false;
2037 session->state = ISCSI_SESSION_FREE;
2038 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2039 INIT_LIST_HEAD(&session->sess_list);
2040 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2041 INIT_WORK(&session->block_work, __iscsi_block_session);
2042 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2043 INIT_WORK(&session->scan_work, iscsi_scan_session);
2044 INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2045 spin_lock_init(&session->lock);
2046
2047 /* this is released in the dev's release function */
2048 scsi_host_get(shost);
2049 session->dev.parent = &shost->shost_gendev;
2050 session->dev.release = iscsi_session_release;
2051 device_initialize(&session->dev);
2052 if (dd_size)
2053 session->dd_data = &session[1];
2054
2055 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2056 return session;
2057 }
2058 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2059
iscsi_add_session(struct iscsi_cls_session * session,unsigned int target_id)2060 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2061 {
2062 struct Scsi_Host *shost = iscsi_session_to_shost(session);
2063 unsigned long flags;
2064 int id = 0;
2065 int err;
2066
2067 session->sid = atomic_add_return(1, &iscsi_session_nr);
2068
2069 session->workq = alloc_workqueue("iscsi_ctrl_%d:%d",
2070 WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
2071 shost->host_no, session->sid);
2072 if (!session->workq)
2073 return -ENOMEM;
2074
2075 if (target_id == ISCSI_MAX_TARGET) {
2076 id = ida_alloc(&iscsi_sess_ida, GFP_KERNEL);
2077
2078 if (id < 0) {
2079 iscsi_cls_session_printk(KERN_ERR, session,
2080 "Failure in Target ID Allocation\n");
2081 err = id;
2082 goto destroy_wq;
2083 }
2084 session->target_id = (unsigned int)id;
2085 session->ida_used = true;
2086 } else
2087 session->target_id = target_id;
2088 spin_lock_irqsave(&session->lock, flags);
2089 session->target_state = ISCSI_SESSION_TARGET_ALLOCATED;
2090 spin_unlock_irqrestore(&session->lock, flags);
2091
2092 dev_set_name(&session->dev, "session%u", session->sid);
2093 err = device_add(&session->dev);
2094 if (err) {
2095 iscsi_cls_session_printk(KERN_ERR, session,
2096 "could not register session's dev\n");
2097 goto release_ida;
2098 }
2099 err = transport_register_device(&session->dev);
2100 if (err) {
2101 iscsi_cls_session_printk(KERN_ERR, session,
2102 "could not register transport's dev\n");
2103 goto release_dev;
2104 }
2105
2106 spin_lock_irqsave(&sesslock, flags);
2107 list_add(&session->sess_list, &sesslist);
2108 spin_unlock_irqrestore(&sesslock, flags);
2109
2110 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2111 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2112 return 0;
2113
2114 release_dev:
2115 device_del(&session->dev);
2116 release_ida:
2117 if (session->ida_used)
2118 ida_free(&iscsi_sess_ida, session->target_id);
2119 destroy_wq:
2120 destroy_workqueue(session->workq);
2121 return err;
2122 }
2123 EXPORT_SYMBOL_GPL(iscsi_add_session);
2124
2125 /**
2126 * iscsi_create_session - create iscsi class session
2127 * @shost: scsi host
2128 * @transport: iscsi transport
2129 * @dd_size: private driver data size
2130 * @target_id: which target
2131 *
2132 * This can be called from a LLD or iscsi_transport.
2133 */
2134 struct iscsi_cls_session *
iscsi_create_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size,unsigned int target_id)2135 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2136 int dd_size, unsigned int target_id)
2137 {
2138 struct iscsi_cls_session *session;
2139
2140 session = iscsi_alloc_session(shost, transport, dd_size);
2141 if (!session)
2142 return NULL;
2143
2144 if (iscsi_add_session(session, target_id)) {
2145 iscsi_free_session(session);
2146 return NULL;
2147 }
2148 return session;
2149 }
2150 EXPORT_SYMBOL_GPL(iscsi_create_session);
2151
iscsi_conn_release(struct device * dev)2152 static void iscsi_conn_release(struct device *dev)
2153 {
2154 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2155 struct device *parent = conn->dev.parent;
2156
2157 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2158 kfree(conn);
2159 put_device(parent);
2160 }
2161
iscsi_is_conn_dev(const struct device * dev)2162 static int iscsi_is_conn_dev(const struct device *dev)
2163 {
2164 return dev->release == iscsi_conn_release;
2165 }
2166
iscsi_iter_destroy_conn_fn(struct device * dev,void * data)2167 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2168 {
2169 if (!iscsi_is_conn_dev(dev))
2170 return 0;
2171
2172 iscsi_remove_conn(iscsi_dev_to_conn(dev));
2173 iscsi_put_conn(iscsi_dev_to_conn(dev));
2174
2175 return 0;
2176 }
2177
iscsi_remove_session(struct iscsi_cls_session * session)2178 void iscsi_remove_session(struct iscsi_cls_session *session)
2179 {
2180 unsigned long flags;
2181 int err;
2182
2183 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2184
2185 spin_lock_irqsave(&sesslock, flags);
2186 if (!list_empty(&session->sess_list))
2187 list_del(&session->sess_list);
2188 spin_unlock_irqrestore(&sesslock, flags);
2189
2190 if (!cancel_work_sync(&session->block_work))
2191 cancel_delayed_work_sync(&session->recovery_work);
2192 cancel_work_sync(&session->unblock_work);
2193 /*
2194 * If we are blocked let commands flow again. The lld or iscsi
2195 * layer should set up the queuecommand to fail commands.
2196 * We assume that LLD will not be calling block/unblock while
2197 * removing the session.
2198 */
2199 spin_lock_irqsave(&session->lock, flags);
2200 session->state = ISCSI_SESSION_FREE;
2201 spin_unlock_irqrestore(&session->lock, flags);
2202
2203 scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2204 /*
2205 * qla4xxx can perform it's own scans when it runs in kernel only
2206 * mode. Make sure to flush those scans.
2207 */
2208 flush_work(&session->scan_work);
2209 /* flush running unbind operations */
2210 flush_work(&session->unbind_work);
2211 __iscsi_unbind_session(&session->unbind_work);
2212
2213 /* hw iscsi may not have removed all connections from session */
2214 err = device_for_each_child(&session->dev, NULL,
2215 iscsi_iter_destroy_conn_fn);
2216 if (err)
2217 iscsi_cls_session_printk(KERN_ERR, session,
2218 "Could not delete all connections "
2219 "for session. Error %d.\n", err);
2220
2221 transport_unregister_device(&session->dev);
2222
2223 destroy_workqueue(session->workq);
2224
2225 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2226 device_del(&session->dev);
2227 }
2228 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2229
iscsi_stop_conn(struct iscsi_cls_conn * conn,int flag)2230 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2231 {
2232 ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2233
2234 switch (flag) {
2235 case STOP_CONN_RECOVER:
2236 WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2237 break;
2238 case STOP_CONN_TERM:
2239 WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2240 break;
2241 default:
2242 iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2243 flag);
2244 return;
2245 }
2246
2247 conn->transport->stop_conn(conn, flag);
2248 ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2249 }
2250
iscsi_ep_disconnect(struct iscsi_cls_conn * conn,bool is_active)2251 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2252 {
2253 struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2254 struct iscsi_endpoint *ep;
2255
2256 ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2257 WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2258
2259 if (!conn->ep || !session->transport->ep_disconnect)
2260 return;
2261
2262 ep = conn->ep;
2263 conn->ep = NULL;
2264
2265 session->transport->unbind_conn(conn, is_active);
2266 session->transport->ep_disconnect(ep);
2267 ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2268 }
2269
iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn * conn,struct iscsi_endpoint * ep,bool is_active)2270 static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2271 struct iscsi_endpoint *ep,
2272 bool is_active)
2273 {
2274 /* Check if this was a conn error and the kernel took ownership */
2275 spin_lock_irq(&conn->lock);
2276 if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2277 spin_unlock_irq(&conn->lock);
2278 iscsi_ep_disconnect(conn, is_active);
2279 } else {
2280 spin_unlock_irq(&conn->lock);
2281 ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2282 mutex_unlock(&conn->ep_mutex);
2283
2284 flush_work(&conn->cleanup_work);
2285 /*
2286 * Userspace is now done with the EP so we can release the ref
2287 * iscsi_cleanup_conn_work_fn took.
2288 */
2289 iscsi_put_endpoint(ep);
2290 mutex_lock(&conn->ep_mutex);
2291 }
2292 }
2293
iscsi_if_stop_conn(struct iscsi_cls_conn * conn,int flag)2294 static int iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2295 {
2296 ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2297 /*
2298 * For offload, iscsid may not know about the ep like when iscsid is
2299 * restarted or for kernel based session shutdown iscsid is not even
2300 * up. For these cases, we do the disconnect now.
2301 */
2302 mutex_lock(&conn->ep_mutex);
2303 if (conn->ep)
2304 iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
2305 mutex_unlock(&conn->ep_mutex);
2306
2307 /*
2308 * If this is a termination we have to call stop_conn with that flag
2309 * so the correct states get set. If we haven't run the work yet try to
2310 * avoid the extra run.
2311 */
2312 if (flag == STOP_CONN_TERM) {
2313 cancel_work_sync(&conn->cleanup_work);
2314 iscsi_stop_conn(conn, flag);
2315 } else {
2316 /*
2317 * Figure out if it was the kernel or userspace initiating this.
2318 */
2319 spin_lock_irq(&conn->lock);
2320 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2321 spin_unlock_irq(&conn->lock);
2322 iscsi_stop_conn(conn, flag);
2323 } else {
2324 spin_unlock_irq(&conn->lock);
2325 ISCSI_DBG_TRANS_CONN(conn,
2326 "flush kernel conn cleanup.\n");
2327 flush_work(&conn->cleanup_work);
2328 }
2329 /*
2330 * Only clear for recovery to avoid extra cleanup runs during
2331 * termination.
2332 */
2333 spin_lock_irq(&conn->lock);
2334 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2335 spin_unlock_irq(&conn->lock);
2336 }
2337 ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2338 return 0;
2339 }
2340
iscsi_cleanup_conn_work_fn(struct work_struct * work)2341 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2342 {
2343 struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2344 cleanup_work);
2345 struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2346
2347 mutex_lock(&conn->ep_mutex);
2348 /*
2349 * Get a ref to the ep, so we don't release its ID until after
2350 * userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2351 */
2352 if (conn->ep)
2353 get_device(&conn->ep->dev);
2354 iscsi_ep_disconnect(conn, false);
2355
2356 if (system_state != SYSTEM_RUNNING) {
2357 /*
2358 * If the user has set up for the session to never timeout
2359 * then hang like they wanted. For all other cases fail right
2360 * away since userspace is not going to relogin.
2361 */
2362 if (session->recovery_tmo > 0)
2363 session->recovery_tmo = 0;
2364 }
2365
2366 iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2367 mutex_unlock(&conn->ep_mutex);
2368 ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2369 }
2370
iscsi_iter_force_destroy_conn_fn(struct device * dev,void * data)2371 static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data)
2372 {
2373 struct iscsi_transport *transport;
2374 struct iscsi_cls_conn *conn;
2375
2376 if (!iscsi_is_conn_dev(dev))
2377 return 0;
2378
2379 conn = iscsi_dev_to_conn(dev);
2380 transport = conn->transport;
2381
2382 if (READ_ONCE(conn->state) != ISCSI_CONN_DOWN)
2383 iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2384
2385 transport->destroy_conn(conn);
2386 return 0;
2387 }
2388
2389 /**
2390 * iscsi_force_destroy_session - destroy a session from the kernel
2391 * @session: session to destroy
2392 *
2393 * Force the destruction of a session from the kernel. This should only be
2394 * used when userspace is no longer running during system shutdown.
2395 */
iscsi_force_destroy_session(struct iscsi_cls_session * session)2396 void iscsi_force_destroy_session(struct iscsi_cls_session *session)
2397 {
2398 struct iscsi_transport *transport = session->transport;
2399 unsigned long flags;
2400
2401 WARN_ON_ONCE(system_state == SYSTEM_RUNNING);
2402
2403 spin_lock_irqsave(&sesslock, flags);
2404 if (list_empty(&session->sess_list)) {
2405 spin_unlock_irqrestore(&sesslock, flags);
2406 /*
2407 * Conn/ep is already freed. Session is being torn down via
2408 * async path. For shutdown we don't care about it so return.
2409 */
2410 return;
2411 }
2412 spin_unlock_irqrestore(&sesslock, flags);
2413
2414 device_for_each_child(&session->dev, NULL,
2415 iscsi_iter_force_destroy_conn_fn);
2416 transport->destroy_session(session);
2417 }
2418 EXPORT_SYMBOL_GPL(iscsi_force_destroy_session);
2419
iscsi_free_session(struct iscsi_cls_session * session)2420 void iscsi_free_session(struct iscsi_cls_session *session)
2421 {
2422 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2423 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2424 put_device(&session->dev);
2425 }
2426 EXPORT_SYMBOL_GPL(iscsi_free_session);
2427
2428 /**
2429 * iscsi_alloc_conn - alloc iscsi class connection
2430 * @session: iscsi cls session
2431 * @dd_size: private driver data size
2432 * @cid: connection id
2433 */
2434 struct iscsi_cls_conn *
iscsi_alloc_conn(struct iscsi_cls_session * session,int dd_size,uint32_t cid)2435 iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2436 {
2437 struct iscsi_transport *transport = session->transport;
2438 struct iscsi_cls_conn *conn;
2439
2440 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2441 if (!conn)
2442 return NULL;
2443 if (dd_size)
2444 conn->dd_data = &conn[1];
2445
2446 mutex_init(&conn->ep_mutex);
2447 spin_lock_init(&conn->lock);
2448 INIT_LIST_HEAD(&conn->conn_list);
2449 INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2450 conn->transport = transport;
2451 conn->cid = cid;
2452 WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2453
2454 /* this is released in the dev's release function */
2455 if (!get_device(&session->dev))
2456 goto free_conn;
2457
2458 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2459 device_initialize(&conn->dev);
2460 conn->dev.parent = &session->dev;
2461 conn->dev.release = iscsi_conn_release;
2462
2463 return conn;
2464
2465 free_conn:
2466 kfree(conn);
2467 return NULL;
2468 }
2469 EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
2470
2471 /**
2472 * iscsi_add_conn - add iscsi class connection
2473 * @conn: iscsi cls connection
2474 *
2475 * This will expose iscsi_cls_conn to sysfs so make sure the related
2476 * resources for sysfs attributes are initialized before calling this.
2477 */
iscsi_add_conn(struct iscsi_cls_conn * conn)2478 int iscsi_add_conn(struct iscsi_cls_conn *conn)
2479 {
2480 int err;
2481 unsigned long flags;
2482 struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
2483
2484 err = device_add(&conn->dev);
2485 if (err) {
2486 iscsi_cls_session_printk(KERN_ERR, session,
2487 "could not register connection's dev\n");
2488 return err;
2489 }
2490 err = transport_register_device(&conn->dev);
2491 if (err) {
2492 iscsi_cls_session_printk(KERN_ERR, session,
2493 "could not register transport's dev\n");
2494 device_del(&conn->dev);
2495 return err;
2496 }
2497
2498 spin_lock_irqsave(&connlock, flags);
2499 list_add(&conn->conn_list, &connlist);
2500 spin_unlock_irqrestore(&connlock, flags);
2501
2502 return 0;
2503 }
2504 EXPORT_SYMBOL_GPL(iscsi_add_conn);
2505
2506 /**
2507 * iscsi_remove_conn - remove iscsi class connection from sysfs
2508 * @conn: iscsi cls connection
2509 *
2510 * Remove iscsi_cls_conn from sysfs, and wait for previous
2511 * read/write of iscsi_cls_conn's attributes in sysfs to finish.
2512 */
iscsi_remove_conn(struct iscsi_cls_conn * conn)2513 void iscsi_remove_conn(struct iscsi_cls_conn *conn)
2514 {
2515 unsigned long flags;
2516
2517 spin_lock_irqsave(&connlock, flags);
2518 list_del(&conn->conn_list);
2519 spin_unlock_irqrestore(&connlock, flags);
2520
2521 transport_unregister_device(&conn->dev);
2522 device_del(&conn->dev);
2523 }
2524 EXPORT_SYMBOL_GPL(iscsi_remove_conn);
2525
iscsi_put_conn(struct iscsi_cls_conn * conn)2526 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2527 {
2528 put_device(&conn->dev);
2529 }
2530 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2531
iscsi_get_conn(struct iscsi_cls_conn * conn)2532 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2533 {
2534 get_device(&conn->dev);
2535 }
2536 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2537
2538 /*
2539 * iscsi interface functions
2540 */
2541 static struct iscsi_internal *
iscsi_if_transport_lookup(struct iscsi_transport * tt)2542 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2543 {
2544 struct iscsi_internal *priv;
2545 unsigned long flags;
2546
2547 spin_lock_irqsave(&iscsi_transport_lock, flags);
2548 list_for_each_entry(priv, &iscsi_transports, list) {
2549 if (tt == priv->iscsi_transport) {
2550 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2551 return priv;
2552 }
2553 }
2554 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2555 return NULL;
2556 }
2557
2558 static int
iscsi_multicast_skb(struct sk_buff * skb,uint32_t group,gfp_t gfp)2559 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2560 {
2561 return nlmsg_multicast(nls, skb, 0, group, gfp);
2562 }
2563
2564 static int
iscsi_unicast_skb(struct sk_buff * skb,u32 portid)2565 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2566 {
2567 return nlmsg_unicast(nls, skb, portid);
2568 }
2569
iscsi_recv_pdu(struct iscsi_cls_conn * conn,struct iscsi_hdr * hdr,char * data,uint32_t data_size)2570 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2571 char *data, uint32_t data_size)
2572 {
2573 struct nlmsghdr *nlh;
2574 struct sk_buff *skb;
2575 struct iscsi_uevent *ev;
2576 char *pdu;
2577 struct iscsi_internal *priv;
2578 int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2579 data_size);
2580
2581 priv = iscsi_if_transport_lookup(conn->transport);
2582 if (!priv)
2583 return -EINVAL;
2584
2585 skb = alloc_skb(len, GFP_ATOMIC);
2586 if (!skb) {
2587 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2588 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2589 "control PDU: OOM\n");
2590 return -ENOMEM;
2591 }
2592
2593 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2594 ev = nlmsg_data(nlh);
2595 memset(ev, 0, sizeof(*ev));
2596 ev->transport_handle = iscsi_handle(conn->transport);
2597 ev->type = ISCSI_KEVENT_RECV_PDU;
2598 ev->r.recv_req.cid = conn->cid;
2599 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2600 pdu = (char*)ev + sizeof(*ev);
2601 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2602 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2603
2604 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2605 }
2606 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2607
iscsi_offload_mesg(struct Scsi_Host * shost,struct iscsi_transport * transport,uint32_t type,char * data,uint16_t data_size)2608 int iscsi_offload_mesg(struct Scsi_Host *shost,
2609 struct iscsi_transport *transport, uint32_t type,
2610 char *data, uint16_t data_size)
2611 {
2612 struct nlmsghdr *nlh;
2613 struct sk_buff *skb;
2614 struct iscsi_uevent *ev;
2615 int len = nlmsg_total_size(sizeof(*ev) + data_size);
2616
2617 skb = alloc_skb(len, GFP_ATOMIC);
2618 if (!skb) {
2619 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2620 return -ENOMEM;
2621 }
2622
2623 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2624 ev = nlmsg_data(nlh);
2625 memset(ev, 0, sizeof(*ev));
2626 ev->type = type;
2627 ev->transport_handle = iscsi_handle(transport);
2628 switch (type) {
2629 case ISCSI_KEVENT_PATH_REQ:
2630 ev->r.req_path.host_no = shost->host_no;
2631 break;
2632 case ISCSI_KEVENT_IF_DOWN:
2633 ev->r.notify_if_down.host_no = shost->host_no;
2634 break;
2635 }
2636
2637 memcpy((char *)ev + sizeof(*ev), data, data_size);
2638
2639 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2640 }
2641 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2642
iscsi_conn_error_event(struct iscsi_cls_conn * conn,enum iscsi_err error)2643 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2644 {
2645 struct nlmsghdr *nlh;
2646 struct sk_buff *skb;
2647 struct iscsi_uevent *ev;
2648 struct iscsi_internal *priv;
2649 int len = nlmsg_total_size(sizeof(*ev));
2650 unsigned long flags;
2651 int state;
2652
2653 spin_lock_irqsave(&conn->lock, flags);
2654 /*
2655 * Userspace will only do a stop call if we are at least bound. And, we
2656 * only need to do the in kernel cleanup if in the UP state so cmds can
2657 * be released to upper layers. If in other states just wait for
2658 * userspace to avoid races that can leave the cleanup_work queued.
2659 */
2660 state = READ_ONCE(conn->state);
2661 switch (state) {
2662 case ISCSI_CONN_BOUND:
2663 case ISCSI_CONN_UP:
2664 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2665 &conn->flags)) {
2666 queue_work(iscsi_conn_cleanup_workq,
2667 &conn->cleanup_work);
2668 }
2669 break;
2670 default:
2671 ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2672 state);
2673 break;
2674 }
2675 spin_unlock_irqrestore(&conn->lock, flags);
2676
2677 priv = iscsi_if_transport_lookup(conn->transport);
2678 if (!priv)
2679 return;
2680
2681 skb = alloc_skb(len, GFP_ATOMIC);
2682 if (!skb) {
2683 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2684 "conn error (%d)\n", error);
2685 return;
2686 }
2687
2688 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2689 ev = nlmsg_data(nlh);
2690 ev->transport_handle = iscsi_handle(conn->transport);
2691 ev->type = ISCSI_KEVENT_CONN_ERROR;
2692 ev->r.connerror.error = error;
2693 ev->r.connerror.cid = conn->cid;
2694 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2695
2696 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2697
2698 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2699 error);
2700 }
2701 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2702
iscsi_conn_login_event(struct iscsi_cls_conn * conn,enum iscsi_conn_state state)2703 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2704 enum iscsi_conn_state state)
2705 {
2706 struct nlmsghdr *nlh;
2707 struct sk_buff *skb;
2708 struct iscsi_uevent *ev;
2709 struct iscsi_internal *priv;
2710 int len = nlmsg_total_size(sizeof(*ev));
2711
2712 priv = iscsi_if_transport_lookup(conn->transport);
2713 if (!priv)
2714 return;
2715
2716 skb = alloc_skb(len, GFP_ATOMIC);
2717 if (!skb) {
2718 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2719 "conn login (%d)\n", state);
2720 return;
2721 }
2722
2723 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2724 ev = nlmsg_data(nlh);
2725 ev->transport_handle = iscsi_handle(conn->transport);
2726 ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2727 ev->r.conn_login.state = state;
2728 ev->r.conn_login.cid = conn->cid;
2729 ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2730 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2731
2732 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2733 state);
2734 }
2735 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2736
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)2737 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2738 enum iscsi_host_event_code code, uint32_t data_size,
2739 uint8_t *data)
2740 {
2741 struct nlmsghdr *nlh;
2742 struct sk_buff *skb;
2743 struct iscsi_uevent *ev;
2744 int len = nlmsg_total_size(sizeof(*ev) + data_size);
2745
2746 skb = alloc_skb(len, GFP_NOIO);
2747 if (!skb) {
2748 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2749 host_no, code);
2750 return;
2751 }
2752
2753 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2754 ev = nlmsg_data(nlh);
2755 ev->transport_handle = iscsi_handle(transport);
2756 ev->type = ISCSI_KEVENT_HOST_EVENT;
2757 ev->r.host_event.host_no = host_no;
2758 ev->r.host_event.code = code;
2759 ev->r.host_event.data_size = data_size;
2760
2761 if (data_size)
2762 memcpy((char *)ev + sizeof(*ev), data, data_size);
2763
2764 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2765 }
2766 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2767
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)2768 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2769 uint32_t status, uint32_t pid, uint32_t data_size,
2770 uint8_t *data)
2771 {
2772 struct nlmsghdr *nlh;
2773 struct sk_buff *skb;
2774 struct iscsi_uevent *ev;
2775 int len = nlmsg_total_size(sizeof(*ev) + data_size);
2776
2777 skb = alloc_skb(len, GFP_NOIO);
2778 if (!skb) {
2779 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2780 return;
2781 }
2782
2783 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2784 ev = nlmsg_data(nlh);
2785 ev->transport_handle = iscsi_handle(transport);
2786 ev->type = ISCSI_KEVENT_PING_COMP;
2787 ev->r.ping_comp.host_no = host_no;
2788 ev->r.ping_comp.status = status;
2789 ev->r.ping_comp.pid = pid;
2790 ev->r.ping_comp.data_size = data_size;
2791 memcpy((char *)ev + sizeof(*ev), data, data_size);
2792
2793 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2794 }
2795 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2796
2797 static int
iscsi_if_send_reply(u32 portid,int type,void * payload,int size)2798 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2799 {
2800 struct sk_buff *skb;
2801 struct nlmsghdr *nlh;
2802 int len = nlmsg_total_size(size);
2803
2804 skb = alloc_skb(len, GFP_ATOMIC);
2805 if (!skb) {
2806 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2807 return -ENOMEM;
2808 }
2809
2810 nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2811 memcpy(nlmsg_data(nlh), payload, size);
2812 return iscsi_unicast_skb(skb, portid);
2813 }
2814
2815 static int
iscsi_if_get_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)2816 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2817 {
2818 struct iscsi_uevent *ev = nlmsg_data(nlh);
2819 struct iscsi_stats *stats;
2820 struct sk_buff *skbstat;
2821 struct iscsi_cls_conn *conn;
2822 struct nlmsghdr *nlhstat;
2823 struct iscsi_uevent *evstat;
2824 struct iscsi_internal *priv;
2825 int len = nlmsg_total_size(sizeof(*ev) +
2826 sizeof(struct iscsi_stats) +
2827 sizeof(struct iscsi_stats_custom) *
2828 ISCSI_STATS_CUSTOM_MAX);
2829 int err = 0;
2830
2831 priv = iscsi_if_transport_lookup(transport);
2832 if (!priv)
2833 return -EINVAL;
2834
2835 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2836 if (!conn)
2837 return -EEXIST;
2838
2839 do {
2840 int actual_size;
2841
2842 skbstat = alloc_skb(len, GFP_ATOMIC);
2843 if (!skbstat) {
2844 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2845 "deliver stats: OOM\n");
2846 return -ENOMEM;
2847 }
2848
2849 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2850 (len - sizeof(*nlhstat)), 0);
2851 evstat = nlmsg_data(nlhstat);
2852 memset(evstat, 0, sizeof(*evstat));
2853 evstat->transport_handle = iscsi_handle(conn->transport);
2854 evstat->type = nlh->nlmsg_type;
2855 evstat->u.get_stats.cid =
2856 ev->u.get_stats.cid;
2857 evstat->u.get_stats.sid =
2858 ev->u.get_stats.sid;
2859 stats = (struct iscsi_stats *)
2860 ((char*)evstat + sizeof(*evstat));
2861 memset(stats, 0, sizeof(*stats));
2862
2863 transport->get_stats(conn, stats);
2864 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2865 sizeof(struct iscsi_stats) +
2866 sizeof(struct iscsi_stats_custom) *
2867 stats->custom_length);
2868 actual_size -= sizeof(*nlhstat);
2869 actual_size = nlmsg_msg_size(actual_size);
2870 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2871 nlhstat->nlmsg_len = actual_size;
2872
2873 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2874 GFP_ATOMIC);
2875 } while (err < 0 && err != -ECONNREFUSED);
2876
2877 return err;
2878 }
2879
2880 /**
2881 * iscsi_session_event - send session destr. completion event
2882 * @session: iscsi class session
2883 * @event: type of event
2884 */
iscsi_session_event(struct iscsi_cls_session * session,enum iscsi_uevent_e event)2885 int iscsi_session_event(struct iscsi_cls_session *session,
2886 enum iscsi_uevent_e event)
2887 {
2888 struct iscsi_internal *priv;
2889 struct Scsi_Host *shost;
2890 struct iscsi_uevent *ev;
2891 struct sk_buff *skb;
2892 struct nlmsghdr *nlh;
2893 int rc, len = nlmsg_total_size(sizeof(*ev));
2894
2895 priv = iscsi_if_transport_lookup(session->transport);
2896 if (!priv)
2897 return -EINVAL;
2898 shost = iscsi_session_to_shost(session);
2899
2900 skb = alloc_skb(len, GFP_KERNEL);
2901 if (!skb) {
2902 iscsi_cls_session_printk(KERN_ERR, session,
2903 "Cannot notify userspace of session "
2904 "event %u\n", event);
2905 return -ENOMEM;
2906 }
2907
2908 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2909 ev = nlmsg_data(nlh);
2910 ev->transport_handle = iscsi_handle(session->transport);
2911
2912 ev->type = event;
2913 switch (event) {
2914 case ISCSI_KEVENT_DESTROY_SESSION:
2915 ev->r.d_session.host_no = shost->host_no;
2916 ev->r.d_session.sid = session->sid;
2917 break;
2918 case ISCSI_KEVENT_CREATE_SESSION:
2919 ev->r.c_session_ret.host_no = shost->host_no;
2920 ev->r.c_session_ret.sid = session->sid;
2921 break;
2922 case ISCSI_KEVENT_UNBIND_SESSION:
2923 ev->r.unbind_session.host_no = shost->host_no;
2924 ev->r.unbind_session.sid = session->sid;
2925 break;
2926 default:
2927 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2928 "%u.\n", event);
2929 kfree_skb(skb);
2930 return -EINVAL;
2931 }
2932
2933 /*
2934 * this will occur if the daemon is not up, so we just warn
2935 * the user and when the daemon is restarted it will handle it
2936 */
2937 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2938 if (rc == -ESRCH)
2939 iscsi_cls_session_printk(KERN_ERR, session,
2940 "Cannot notify userspace of session "
2941 "event %u. Check iscsi daemon\n",
2942 event);
2943
2944 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2945 event, rc);
2946 return rc;
2947 }
2948 EXPORT_SYMBOL_GPL(iscsi_session_event);
2949
2950 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)2951 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2952 struct iscsi_uevent *ev, pid_t pid,
2953 uint32_t initial_cmdsn, uint16_t cmds_max,
2954 uint16_t queue_depth)
2955 {
2956 struct iscsi_transport *transport = priv->iscsi_transport;
2957 struct iscsi_cls_session *session;
2958 struct Scsi_Host *shost;
2959
2960 session = transport->create_session(ep, cmds_max, queue_depth,
2961 initial_cmdsn);
2962 if (!session)
2963 return -ENOMEM;
2964
2965 session->creator = pid;
2966 shost = iscsi_session_to_shost(session);
2967 ev->r.c_session_ret.host_no = shost->host_no;
2968 ev->r.c_session_ret.sid = session->sid;
2969 ISCSI_DBG_TRANS_SESSION(session,
2970 "Completed creating transport session\n");
2971 return 0;
2972 }
2973
2974 static int
iscsi_if_create_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)2975 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2976 {
2977 struct iscsi_cls_conn *conn;
2978 struct iscsi_cls_session *session;
2979
2980 session = iscsi_session_lookup(ev->u.c_conn.sid);
2981 if (!session) {
2982 printk(KERN_ERR "iscsi: invalid session %d.\n",
2983 ev->u.c_conn.sid);
2984 return -EINVAL;
2985 }
2986
2987 conn = transport->create_conn(session, ev->u.c_conn.cid);
2988 if (!conn) {
2989 iscsi_cls_session_printk(KERN_ERR, session,
2990 "couldn't create a new connection.");
2991 return -ENOMEM;
2992 }
2993
2994 ev->r.c_conn_ret.sid = session->sid;
2995 ev->r.c_conn_ret.cid = conn->cid;
2996
2997 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2998 return 0;
2999 }
3000
3001 static int
iscsi_if_destroy_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)3002 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3003 {
3004 struct iscsi_cls_conn *conn;
3005
3006 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
3007 if (!conn)
3008 return -EINVAL;
3009
3010 ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
3011 flush_work(&conn->cleanup_work);
3012 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
3013
3014 if (transport->destroy_conn)
3015 transport->destroy_conn(conn);
3016 return 0;
3017 }
3018
3019 static int
iscsi_if_set_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3020 iscsi_if_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3021 {
3022 char *data = (char*)ev + sizeof(*ev);
3023 struct iscsi_cls_conn *conn;
3024 struct iscsi_cls_session *session;
3025 int err = 0, value = 0, state;
3026
3027 if (ev->u.set_param.len > rlen ||
3028 ev->u.set_param.len > PAGE_SIZE)
3029 return -EINVAL;
3030
3031 session = iscsi_session_lookup(ev->u.set_param.sid);
3032 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
3033 if (!conn || !session)
3034 return -EINVAL;
3035
3036 /* data will be regarded as NULL-ended string, do length check */
3037 if (strlen(data) > ev->u.set_param.len)
3038 return -EINVAL;
3039
3040 switch (ev->u.set_param.param) {
3041 case ISCSI_PARAM_SESS_RECOVERY_TMO:
3042 sscanf(data, "%d", &value);
3043 if (!session->recovery_tmo_sysfs_override)
3044 session->recovery_tmo = value;
3045 break;
3046 default:
3047 state = READ_ONCE(conn->state);
3048 if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
3049 err = transport->set_param(conn, ev->u.set_param.param,
3050 data, ev->u.set_param.len);
3051 } else {
3052 return -ENOTCONN;
3053 }
3054 }
3055
3056 return err;
3057 }
3058
iscsi_if_ep_connect(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type)3059 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3060 struct iscsi_uevent *ev, int msg_type)
3061 {
3062 struct iscsi_endpoint *ep;
3063 struct sockaddr *dst_addr;
3064 struct Scsi_Host *shost = NULL;
3065 int non_blocking, err = 0;
3066
3067 if (!transport->ep_connect)
3068 return -EINVAL;
3069
3070 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3071 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
3072 if (!shost) {
3073 printk(KERN_ERR "ep connect failed. Could not find "
3074 "host no %u\n",
3075 ev->u.ep_connect_through_host.host_no);
3076 return -ENODEV;
3077 }
3078 non_blocking = ev->u.ep_connect_through_host.non_blocking;
3079 } else
3080 non_blocking = ev->u.ep_connect.non_blocking;
3081
3082 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3083 ep = transport->ep_connect(shost, dst_addr, non_blocking);
3084 if (IS_ERR(ep)) {
3085 err = PTR_ERR(ep);
3086 goto release_host;
3087 }
3088
3089 ev->r.ep_connect_ret.handle = ep->id;
3090 release_host:
3091 if (shost)
3092 scsi_host_put(shost);
3093 return err;
3094 }
3095
iscsi_if_ep_disconnect(struct iscsi_transport * transport,u64 ep_handle)3096 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3097 u64 ep_handle)
3098 {
3099 struct iscsi_cls_conn *conn;
3100 struct iscsi_endpoint *ep;
3101
3102 if (!transport->ep_disconnect)
3103 return -EINVAL;
3104
3105 ep = iscsi_lookup_endpoint(ep_handle);
3106 if (!ep)
3107 return -EINVAL;
3108
3109 conn = ep->conn;
3110 if (!conn) {
3111 /*
3112 * conn was not even bound yet, so we can't get iscsi conn
3113 * failures yet.
3114 */
3115 transport->ep_disconnect(ep);
3116 goto put_ep;
3117 }
3118
3119 mutex_lock(&conn->ep_mutex);
3120 iscsi_if_disconnect_bound_ep(conn, ep, false);
3121 mutex_unlock(&conn->ep_mutex);
3122 put_ep:
3123 iscsi_put_endpoint(ep);
3124 return 0;
3125 }
3126
3127 static int
iscsi_if_transport_ep(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type,u32 rlen)3128 iscsi_if_transport_ep(struct iscsi_transport *transport,
3129 struct iscsi_uevent *ev, int msg_type, u32 rlen)
3130 {
3131 struct iscsi_endpoint *ep;
3132 int rc = 0;
3133
3134 switch (msg_type) {
3135 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3136 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3137 if (rlen < sizeof(struct sockaddr))
3138 rc = -EINVAL;
3139 else
3140 rc = iscsi_if_ep_connect(transport, ev, msg_type);
3141 break;
3142 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3143 if (!transport->ep_poll)
3144 return -EINVAL;
3145
3146 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3147 if (!ep)
3148 return -EINVAL;
3149
3150 ev->r.retcode = transport->ep_poll(ep,
3151 ev->u.ep_poll.timeout_ms);
3152 iscsi_put_endpoint(ep);
3153 break;
3154 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3155 rc = iscsi_if_ep_disconnect(transport,
3156 ev->u.ep_disconnect.ep_handle);
3157 break;
3158 }
3159 return rc;
3160 }
3161
3162 static int
iscsi_tgt_dscvr(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3163 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3164 struct iscsi_uevent *ev, u32 rlen)
3165 {
3166 struct Scsi_Host *shost;
3167 struct sockaddr *dst_addr;
3168 int err;
3169
3170 if (rlen < sizeof(*dst_addr))
3171 return -EINVAL;
3172
3173 if (!transport->tgt_dscvr)
3174 return -EINVAL;
3175
3176 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3177 if (!shost) {
3178 printk(KERN_ERR "target discovery could not find host no %u\n",
3179 ev->u.tgt_dscvr.host_no);
3180 return -ENODEV;
3181 }
3182
3183
3184 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3185 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3186 ev->u.tgt_dscvr.enable, dst_addr);
3187 scsi_host_put(shost);
3188 return err;
3189 }
3190
3191 static int
iscsi_set_host_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3192 iscsi_set_host_param(struct iscsi_transport *transport,
3193 struct iscsi_uevent *ev, u32 rlen)
3194 {
3195 char *data = (char*)ev + sizeof(*ev);
3196 struct Scsi_Host *shost;
3197 int err;
3198
3199 if (!transport->set_host_param)
3200 return -ENOSYS;
3201
3202 if (ev->u.set_host_param.len > rlen ||
3203 ev->u.set_host_param.len > PAGE_SIZE)
3204 return -EINVAL;
3205
3206 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3207 if (!shost) {
3208 printk(KERN_ERR "set_host_param could not find host no %u\n",
3209 ev->u.set_host_param.host_no);
3210 return -ENODEV;
3211 }
3212
3213 /* see similar check in iscsi_if_set_param() */
3214 if (strlen(data) > ev->u.set_host_param.len) {
3215 err = -EINVAL;
3216 goto out;
3217 }
3218
3219 err = transport->set_host_param(shost, ev->u.set_host_param.param,
3220 data, ev->u.set_host_param.len);
3221 out:
3222 scsi_host_put(shost);
3223 return err;
3224 }
3225
3226 static int
iscsi_set_path(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3227 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3228 {
3229 struct Scsi_Host *shost;
3230 struct iscsi_path *params;
3231 int err;
3232
3233 if (rlen < sizeof(*params))
3234 return -EINVAL;
3235
3236 if (!transport->set_path)
3237 return -ENOSYS;
3238
3239 shost = scsi_host_lookup(ev->u.set_path.host_no);
3240 if (!shost) {
3241 printk(KERN_ERR "set path could not find host no %u\n",
3242 ev->u.set_path.host_no);
3243 return -ENODEV;
3244 }
3245
3246 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3247 err = transport->set_path(shost, params);
3248
3249 scsi_host_put(shost);
3250 return err;
3251 }
3252
iscsi_session_has_conns(int sid)3253 static int iscsi_session_has_conns(int sid)
3254 {
3255 struct iscsi_cls_conn *conn;
3256 unsigned long flags;
3257 int found = 0;
3258
3259 spin_lock_irqsave(&connlock, flags);
3260 list_for_each_entry(conn, &connlist, conn_list) {
3261 if (iscsi_conn_get_sid(conn) == sid) {
3262 found = 1;
3263 break;
3264 }
3265 }
3266 spin_unlock_irqrestore(&connlock, flags);
3267
3268 return found;
3269 }
3270
3271 static int
iscsi_set_iface_params(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3272 iscsi_set_iface_params(struct iscsi_transport *transport,
3273 struct iscsi_uevent *ev, uint32_t len)
3274 {
3275 char *data = (char *)ev + sizeof(*ev);
3276 struct Scsi_Host *shost;
3277 int err;
3278
3279 if (!transport->set_iface_param)
3280 return -ENOSYS;
3281
3282 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3283 if (!shost) {
3284 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3285 ev->u.set_iface_params.host_no);
3286 return -ENODEV;
3287 }
3288
3289 err = transport->set_iface_param(shost, data, len);
3290 scsi_host_put(shost);
3291 return err;
3292 }
3293
3294 static int
iscsi_send_ping(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3295 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3296 {
3297 struct Scsi_Host *shost;
3298 struct sockaddr *dst_addr;
3299 int err;
3300
3301 if (rlen < sizeof(*dst_addr))
3302 return -EINVAL;
3303
3304 if (!transport->send_ping)
3305 return -ENOSYS;
3306
3307 shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3308 if (!shost) {
3309 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3310 ev->u.iscsi_ping.host_no);
3311 return -ENODEV;
3312 }
3313
3314 dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3315 err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3316 ev->u.iscsi_ping.iface_type,
3317 ev->u.iscsi_ping.payload_size,
3318 ev->u.iscsi_ping.pid,
3319 dst_addr);
3320 scsi_host_put(shost);
3321 return err;
3322 }
3323
3324 static int
iscsi_get_chap(struct iscsi_transport * transport,struct nlmsghdr * nlh)3325 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3326 {
3327 struct iscsi_uevent *ev = nlmsg_data(nlh);
3328 struct Scsi_Host *shost = NULL;
3329 struct iscsi_chap_rec *chap_rec;
3330 struct iscsi_internal *priv;
3331 struct sk_buff *skbchap;
3332 struct nlmsghdr *nlhchap;
3333 struct iscsi_uevent *evchap;
3334 uint32_t chap_buf_size;
3335 int len, err = 0;
3336 char *buf;
3337
3338 if (!transport->get_chap)
3339 return -EINVAL;
3340
3341 priv = iscsi_if_transport_lookup(transport);
3342 if (!priv)
3343 return -EINVAL;
3344
3345 chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3346 len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3347
3348 shost = scsi_host_lookup(ev->u.get_chap.host_no);
3349 if (!shost) {
3350 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3351 __func__, ev->u.get_chap.host_no);
3352 return -ENODEV;
3353 }
3354
3355 do {
3356 int actual_size;
3357
3358 skbchap = alloc_skb(len, GFP_KERNEL);
3359 if (!skbchap) {
3360 printk(KERN_ERR "can not deliver chap: OOM\n");
3361 err = -ENOMEM;
3362 goto exit_get_chap;
3363 }
3364
3365 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3366 (len - sizeof(*nlhchap)), 0);
3367 evchap = nlmsg_data(nlhchap);
3368 memset(evchap, 0, sizeof(*evchap));
3369 evchap->transport_handle = iscsi_handle(transport);
3370 evchap->type = nlh->nlmsg_type;
3371 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3372 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3373 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3374 buf = (char *)evchap + sizeof(*evchap);
3375 memset(buf, 0, chap_buf_size);
3376
3377 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3378 &evchap->u.get_chap.num_entries, buf);
3379
3380 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3381 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3382 nlhchap->nlmsg_len = actual_size;
3383
3384 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3385 GFP_KERNEL);
3386 } while (err < 0 && err != -ECONNREFUSED);
3387
3388 exit_get_chap:
3389 scsi_host_put(shost);
3390 return err;
3391 }
3392
iscsi_set_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3393 static int iscsi_set_chap(struct iscsi_transport *transport,
3394 struct iscsi_uevent *ev, uint32_t len)
3395 {
3396 char *data = (char *)ev + sizeof(*ev);
3397 struct Scsi_Host *shost;
3398 int err = 0;
3399
3400 if (!transport->set_chap)
3401 return -ENOSYS;
3402
3403 shost = scsi_host_lookup(ev->u.set_path.host_no);
3404 if (!shost) {
3405 pr_err("%s could not find host no %u\n",
3406 __func__, ev->u.set_path.host_no);
3407 return -ENODEV;
3408 }
3409
3410 err = transport->set_chap(shost, data, len);
3411 scsi_host_put(shost);
3412 return err;
3413 }
3414
iscsi_delete_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev)3415 static int iscsi_delete_chap(struct iscsi_transport *transport,
3416 struct iscsi_uevent *ev)
3417 {
3418 struct Scsi_Host *shost;
3419 int err = 0;
3420
3421 if (!transport->delete_chap)
3422 return -ENOSYS;
3423
3424 shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3425 if (!shost) {
3426 printk(KERN_ERR "%s could not find host no %u\n",
3427 __func__, ev->u.delete_chap.host_no);
3428 return -ENODEV;
3429 }
3430
3431 err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3432 scsi_host_put(shost);
3433 return err;
3434 }
3435
3436 static const struct {
3437 enum iscsi_discovery_parent_type value;
3438 char *name;
3439 } iscsi_discovery_parent_names[] = {
3440 {ISCSI_DISC_PARENT_UNKNOWN, "Unknown" },
3441 {ISCSI_DISC_PARENT_SENDTGT, "Sendtarget" },
3442 {ISCSI_DISC_PARENT_ISNS, "isns" },
3443 };
3444
iscsi_get_discovery_parent_name(int parent_type)3445 char *iscsi_get_discovery_parent_name(int parent_type)
3446 {
3447 int i;
3448 char *state = "Unknown!";
3449
3450 for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3451 if (iscsi_discovery_parent_names[i].value & parent_type) {
3452 state = iscsi_discovery_parent_names[i].name;
3453 break;
3454 }
3455 }
3456 return state;
3457 }
3458 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3459
iscsi_set_flashnode_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3460 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3461 struct iscsi_uevent *ev, uint32_t len)
3462 {
3463 char *data = (char *)ev + sizeof(*ev);
3464 struct Scsi_Host *shost;
3465 struct iscsi_bus_flash_session *fnode_sess;
3466 struct iscsi_bus_flash_conn *fnode_conn;
3467 struct device *dev;
3468 uint32_t idx;
3469 int err = 0;
3470
3471 if (!transport->set_flashnode_param) {
3472 err = -ENOSYS;
3473 goto exit_set_fnode;
3474 }
3475
3476 shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3477 if (!shost) {
3478 pr_err("%s could not find host no %u\n",
3479 __func__, ev->u.set_flashnode.host_no);
3480 err = -ENODEV;
3481 goto exit_set_fnode;
3482 }
3483
3484 idx = ev->u.set_flashnode.flashnode_idx;
3485 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3486 if (!fnode_sess) {
3487 pr_err("%s could not find flashnode %u for host no %u\n",
3488 __func__, idx, ev->u.set_flashnode.host_no);
3489 err = -ENODEV;
3490 goto put_host;
3491 }
3492
3493 dev = iscsi_find_flashnode_conn(fnode_sess);
3494 if (!dev) {
3495 err = -ENODEV;
3496 goto put_sess;
3497 }
3498
3499 fnode_conn = iscsi_dev_to_flash_conn(dev);
3500 err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3501 put_device(dev);
3502
3503 put_sess:
3504 put_device(&fnode_sess->dev);
3505
3506 put_host:
3507 scsi_host_put(shost);
3508
3509 exit_set_fnode:
3510 return err;
3511 }
3512
iscsi_new_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3513 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3514 struct iscsi_uevent *ev, uint32_t len)
3515 {
3516 char *data = (char *)ev + sizeof(*ev);
3517 struct Scsi_Host *shost;
3518 int index;
3519 int err = 0;
3520
3521 if (!transport->new_flashnode) {
3522 err = -ENOSYS;
3523 goto exit_new_fnode;
3524 }
3525
3526 shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3527 if (!shost) {
3528 pr_err("%s could not find host no %u\n",
3529 __func__, ev->u.new_flashnode.host_no);
3530 err = -ENODEV;
3531 goto exit_new_fnode;
3532 }
3533
3534 index = transport->new_flashnode(shost, data, len);
3535
3536 if (index >= 0)
3537 ev->r.new_flashnode_ret.flashnode_idx = index;
3538 else
3539 err = -EIO;
3540
3541 scsi_host_put(shost);
3542
3543 exit_new_fnode:
3544 return err;
3545 }
3546
iscsi_del_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3547 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3548 struct iscsi_uevent *ev)
3549 {
3550 struct Scsi_Host *shost;
3551 struct iscsi_bus_flash_session *fnode_sess;
3552 uint32_t idx;
3553 int err = 0;
3554
3555 if (!transport->del_flashnode) {
3556 err = -ENOSYS;
3557 goto exit_del_fnode;
3558 }
3559
3560 shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3561 if (!shost) {
3562 pr_err("%s could not find host no %u\n",
3563 __func__, ev->u.del_flashnode.host_no);
3564 err = -ENODEV;
3565 goto exit_del_fnode;
3566 }
3567
3568 idx = ev->u.del_flashnode.flashnode_idx;
3569 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3570 if (!fnode_sess) {
3571 pr_err("%s could not find flashnode %u for host no %u\n",
3572 __func__, idx, ev->u.del_flashnode.host_no);
3573 err = -ENODEV;
3574 goto put_host;
3575 }
3576
3577 err = transport->del_flashnode(fnode_sess);
3578 put_device(&fnode_sess->dev);
3579
3580 put_host:
3581 scsi_host_put(shost);
3582
3583 exit_del_fnode:
3584 return err;
3585 }
3586
iscsi_login_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3587 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3588 struct iscsi_uevent *ev)
3589 {
3590 struct Scsi_Host *shost;
3591 struct iscsi_bus_flash_session *fnode_sess;
3592 struct iscsi_bus_flash_conn *fnode_conn;
3593 struct device *dev;
3594 uint32_t idx;
3595 int err = 0;
3596
3597 if (!transport->login_flashnode) {
3598 err = -ENOSYS;
3599 goto exit_login_fnode;
3600 }
3601
3602 shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3603 if (!shost) {
3604 pr_err("%s could not find host no %u\n",
3605 __func__, ev->u.login_flashnode.host_no);
3606 err = -ENODEV;
3607 goto exit_login_fnode;
3608 }
3609
3610 idx = ev->u.login_flashnode.flashnode_idx;
3611 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3612 if (!fnode_sess) {
3613 pr_err("%s could not find flashnode %u for host no %u\n",
3614 __func__, idx, ev->u.login_flashnode.host_no);
3615 err = -ENODEV;
3616 goto put_host;
3617 }
3618
3619 dev = iscsi_find_flashnode_conn(fnode_sess);
3620 if (!dev) {
3621 err = -ENODEV;
3622 goto put_sess;
3623 }
3624
3625 fnode_conn = iscsi_dev_to_flash_conn(dev);
3626 err = transport->login_flashnode(fnode_sess, fnode_conn);
3627 put_device(dev);
3628
3629 put_sess:
3630 put_device(&fnode_sess->dev);
3631
3632 put_host:
3633 scsi_host_put(shost);
3634
3635 exit_login_fnode:
3636 return err;
3637 }
3638
iscsi_logout_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3639 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3640 struct iscsi_uevent *ev)
3641 {
3642 struct Scsi_Host *shost;
3643 struct iscsi_bus_flash_session *fnode_sess;
3644 struct iscsi_bus_flash_conn *fnode_conn;
3645 struct device *dev;
3646 uint32_t idx;
3647 int err = 0;
3648
3649 if (!transport->logout_flashnode) {
3650 err = -ENOSYS;
3651 goto exit_logout_fnode;
3652 }
3653
3654 shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3655 if (!shost) {
3656 pr_err("%s could not find host no %u\n",
3657 __func__, ev->u.logout_flashnode.host_no);
3658 err = -ENODEV;
3659 goto exit_logout_fnode;
3660 }
3661
3662 idx = ev->u.logout_flashnode.flashnode_idx;
3663 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3664 if (!fnode_sess) {
3665 pr_err("%s could not find flashnode %u for host no %u\n",
3666 __func__, idx, ev->u.logout_flashnode.host_no);
3667 err = -ENODEV;
3668 goto put_host;
3669 }
3670
3671 dev = iscsi_find_flashnode_conn(fnode_sess);
3672 if (!dev) {
3673 err = -ENODEV;
3674 goto put_sess;
3675 }
3676
3677 fnode_conn = iscsi_dev_to_flash_conn(dev);
3678
3679 err = transport->logout_flashnode(fnode_sess, fnode_conn);
3680 put_device(dev);
3681
3682 put_sess:
3683 put_device(&fnode_sess->dev);
3684
3685 put_host:
3686 scsi_host_put(shost);
3687
3688 exit_logout_fnode:
3689 return err;
3690 }
3691
iscsi_logout_flashnode_sid(struct iscsi_transport * transport,struct iscsi_uevent * ev)3692 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3693 struct iscsi_uevent *ev)
3694 {
3695 struct Scsi_Host *shost;
3696 struct iscsi_cls_session *session;
3697 int err = 0;
3698
3699 if (!transport->logout_flashnode_sid) {
3700 err = -ENOSYS;
3701 goto exit_logout_sid;
3702 }
3703
3704 shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3705 if (!shost) {
3706 pr_err("%s could not find host no %u\n",
3707 __func__, ev->u.logout_flashnode.host_no);
3708 err = -ENODEV;
3709 goto exit_logout_sid;
3710 }
3711
3712 session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3713 if (!session) {
3714 pr_err("%s could not find session id %u\n",
3715 __func__, ev->u.logout_flashnode_sid.sid);
3716 err = -EINVAL;
3717 goto put_host;
3718 }
3719
3720 err = transport->logout_flashnode_sid(session);
3721
3722 put_host:
3723 scsi_host_put(shost);
3724
3725 exit_logout_sid:
3726 return err;
3727 }
3728
3729 static int
iscsi_get_host_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)3730 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3731 {
3732 struct iscsi_uevent *ev = nlmsg_data(nlh);
3733 struct Scsi_Host *shost = NULL;
3734 struct iscsi_internal *priv;
3735 struct sk_buff *skbhost_stats;
3736 struct nlmsghdr *nlhhost_stats;
3737 struct iscsi_uevent *evhost_stats;
3738 int host_stats_size = 0;
3739 int len, err = 0;
3740 char *buf;
3741
3742 if (!transport->get_host_stats)
3743 return -ENOSYS;
3744
3745 priv = iscsi_if_transport_lookup(transport);
3746 if (!priv)
3747 return -EINVAL;
3748
3749 host_stats_size = sizeof(struct iscsi_offload_host_stats);
3750 len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3751
3752 shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3753 if (!shost) {
3754 pr_err("%s: failed. Could not find host no %u\n",
3755 __func__, ev->u.get_host_stats.host_no);
3756 return -ENODEV;
3757 }
3758
3759 do {
3760 int actual_size;
3761
3762 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3763 if (!skbhost_stats) {
3764 pr_err("cannot deliver host stats: OOM\n");
3765 err = -ENOMEM;
3766 goto exit_host_stats;
3767 }
3768
3769 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3770 (len - sizeof(*nlhhost_stats)), 0);
3771 evhost_stats = nlmsg_data(nlhhost_stats);
3772 memset(evhost_stats, 0, sizeof(*evhost_stats));
3773 evhost_stats->transport_handle = iscsi_handle(transport);
3774 evhost_stats->type = nlh->nlmsg_type;
3775 evhost_stats->u.get_host_stats.host_no =
3776 ev->u.get_host_stats.host_no;
3777 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3778 memset(buf, 0, host_stats_size);
3779
3780 err = transport->get_host_stats(shost, buf, host_stats_size);
3781 if (err) {
3782 kfree_skb(skbhost_stats);
3783 goto exit_host_stats;
3784 }
3785
3786 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3787 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3788 nlhhost_stats->nlmsg_len = actual_size;
3789
3790 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3791 GFP_KERNEL);
3792 } while (err < 0 && err != -ECONNREFUSED);
3793
3794 exit_host_stats:
3795 scsi_host_put(shost);
3796 return err;
3797 }
3798
iscsi_if_transport_conn(struct iscsi_transport * transport,struct nlmsghdr * nlh,u32 pdu_len)3799 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3800 struct nlmsghdr *nlh, u32 pdu_len)
3801 {
3802 struct iscsi_uevent *ev = nlmsg_data(nlh);
3803 struct iscsi_cls_session *session;
3804 struct iscsi_cls_conn *conn = NULL;
3805 struct iscsi_endpoint *ep;
3806 int err = 0;
3807
3808 switch (nlh->nlmsg_type) {
3809 case ISCSI_UEVENT_CREATE_CONN:
3810 return iscsi_if_create_conn(transport, ev);
3811 case ISCSI_UEVENT_DESTROY_CONN:
3812 return iscsi_if_destroy_conn(transport, ev);
3813 case ISCSI_UEVENT_STOP_CONN:
3814 conn = iscsi_conn_lookup(ev->u.stop_conn.sid,
3815 ev->u.stop_conn.cid);
3816 if (!conn)
3817 return -EINVAL;
3818
3819 return iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3820 }
3821
3822 /*
3823 * The following cmds need to be run under the ep_mutex so in kernel
3824 * conn cleanup (ep_disconnect + unbind and conn) is not done while
3825 * these are running. They also must not run if we have just run a conn
3826 * cleanup because they would set the state in a way that might allow
3827 * IO or send IO themselves.
3828 */
3829 switch (nlh->nlmsg_type) {
3830 case ISCSI_UEVENT_START_CONN:
3831 conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3832 ev->u.start_conn.cid);
3833 break;
3834 case ISCSI_UEVENT_BIND_CONN:
3835 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3836 break;
3837 case ISCSI_UEVENT_SEND_PDU:
3838 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3839 break;
3840 }
3841
3842 if (!conn)
3843 return -EINVAL;
3844
3845 mutex_lock(&conn->ep_mutex);
3846 spin_lock_irq(&conn->lock);
3847 if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3848 spin_unlock_irq(&conn->lock);
3849 mutex_unlock(&conn->ep_mutex);
3850 ev->r.retcode = -ENOTCONN;
3851 return 0;
3852 }
3853 spin_unlock_irq(&conn->lock);
3854
3855 switch (nlh->nlmsg_type) {
3856 case ISCSI_UEVENT_BIND_CONN:
3857 session = iscsi_session_lookup(ev->u.b_conn.sid);
3858 if (!session) {
3859 err = -EINVAL;
3860 break;
3861 }
3862
3863 ev->r.retcode = transport->bind_conn(session, conn,
3864 ev->u.b_conn.transport_eph,
3865 ev->u.b_conn.is_leading);
3866 if (!ev->r.retcode)
3867 WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3868
3869 if (ev->r.retcode || !transport->ep_connect)
3870 break;
3871
3872 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3873 if (ep) {
3874 ep->conn = conn;
3875 conn->ep = ep;
3876 iscsi_put_endpoint(ep);
3877 } else {
3878 err = -ENOTCONN;
3879 iscsi_cls_conn_printk(KERN_ERR, conn,
3880 "Could not set ep conn binding\n");
3881 }
3882 break;
3883 case ISCSI_UEVENT_START_CONN:
3884 ev->r.retcode = transport->start_conn(conn);
3885 if (!ev->r.retcode)
3886 WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3887
3888 break;
3889 case ISCSI_UEVENT_SEND_PDU:
3890 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3891 (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3892 err = -EINVAL;
3893 break;
3894 }
3895
3896 ev->r.retcode = transport->send_pdu(conn,
3897 (struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3898 (char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3899 ev->u.send_pdu.data_size);
3900 break;
3901 default:
3902 err = -ENOSYS;
3903 }
3904
3905 mutex_unlock(&conn->ep_mutex);
3906 return err;
3907 }
3908
3909 static int
iscsi_if_recv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,uint32_t * group)3910 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3911 {
3912 int err = 0;
3913 u32 portid;
3914 struct iscsi_uevent *ev = nlmsg_data(nlh);
3915 struct iscsi_transport *transport = NULL;
3916 struct iscsi_internal *priv;
3917 struct iscsi_cls_session *session;
3918 struct iscsi_endpoint *ep = NULL;
3919 u32 rlen;
3920
3921 if (!netlink_capable(skb, CAP_SYS_ADMIN))
3922 return -EPERM;
3923
3924 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3925 *group = ISCSI_NL_GRP_UIP;
3926 else
3927 *group = ISCSI_NL_GRP_ISCSID;
3928
3929 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3930 if (!priv)
3931 return -EINVAL;
3932 transport = priv->iscsi_transport;
3933
3934 if (!try_module_get(transport->owner))
3935 return -EINVAL;
3936
3937 portid = NETLINK_CB(skb).portid;
3938
3939 /*
3940 * Even though the remaining payload may not be regarded as nlattr,
3941 * (like address or something else), calculate the remaining length
3942 * here to ease following length checks.
3943 */
3944 rlen = nlmsg_attrlen(nlh, sizeof(*ev));
3945
3946 switch (nlh->nlmsg_type) {
3947 case ISCSI_UEVENT_CREATE_SESSION:
3948 err = iscsi_if_create_session(priv, ep, ev,
3949 portid,
3950 ev->u.c_session.initial_cmdsn,
3951 ev->u.c_session.cmds_max,
3952 ev->u.c_session.queue_depth);
3953 break;
3954 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3955 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3956 if (!ep) {
3957 err = -EINVAL;
3958 break;
3959 }
3960
3961 err = iscsi_if_create_session(priv, ep, ev,
3962 portid,
3963 ev->u.c_bound_session.initial_cmdsn,
3964 ev->u.c_bound_session.cmds_max,
3965 ev->u.c_bound_session.queue_depth);
3966 iscsi_put_endpoint(ep);
3967 break;
3968 case ISCSI_UEVENT_DESTROY_SESSION:
3969 session = iscsi_session_lookup(ev->u.d_session.sid);
3970 if (!session)
3971 err = -EINVAL;
3972 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3973 err = -EBUSY;
3974 else
3975 transport->destroy_session(session);
3976 break;
3977 case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3978 session = iscsi_session_lookup(ev->u.d_session.sid);
3979 if (!session)
3980 err = -EINVAL;
3981 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3982 err = -EBUSY;
3983 else {
3984 unsigned long flags;
3985
3986 /* Prevent this session from being found again */
3987 spin_lock_irqsave(&sesslock, flags);
3988 list_del_init(&session->sess_list);
3989 spin_unlock_irqrestore(&sesslock, flags);
3990
3991 queue_work(system_unbound_wq, &session->destroy_work);
3992 }
3993 break;
3994 case ISCSI_UEVENT_UNBIND_SESSION:
3995 session = iscsi_session_lookup(ev->u.d_session.sid);
3996 if (session)
3997 queue_work(session->workq, &session->unbind_work);
3998 else
3999 err = -EINVAL;
4000 break;
4001 case ISCSI_UEVENT_SET_PARAM:
4002 err = iscsi_if_set_param(transport, ev, rlen);
4003 break;
4004 case ISCSI_UEVENT_CREATE_CONN:
4005 case ISCSI_UEVENT_DESTROY_CONN:
4006 case ISCSI_UEVENT_STOP_CONN:
4007 case ISCSI_UEVENT_START_CONN:
4008 case ISCSI_UEVENT_BIND_CONN:
4009 case ISCSI_UEVENT_SEND_PDU:
4010 err = iscsi_if_transport_conn(transport, nlh, rlen);
4011 break;
4012 case ISCSI_UEVENT_GET_STATS:
4013 err = iscsi_if_get_stats(transport, nlh);
4014 break;
4015 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
4016 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
4017 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
4018 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
4019 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type, rlen);
4020 break;
4021 case ISCSI_UEVENT_TGT_DSCVR:
4022 err = iscsi_tgt_dscvr(transport, ev, rlen);
4023 break;
4024 case ISCSI_UEVENT_SET_HOST_PARAM:
4025 err = iscsi_set_host_param(transport, ev, rlen);
4026 break;
4027 case ISCSI_UEVENT_PATH_UPDATE:
4028 err = iscsi_set_path(transport, ev, rlen);
4029 break;
4030 case ISCSI_UEVENT_SET_IFACE_PARAMS:
4031 err = iscsi_set_iface_params(transport, ev, rlen);
4032 break;
4033 case ISCSI_UEVENT_PING:
4034 err = iscsi_send_ping(transport, ev, rlen);
4035 break;
4036 case ISCSI_UEVENT_GET_CHAP:
4037 err = iscsi_get_chap(transport, nlh);
4038 break;
4039 case ISCSI_UEVENT_DELETE_CHAP:
4040 err = iscsi_delete_chap(transport, ev);
4041 break;
4042 case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
4043 err = iscsi_set_flashnode_param(transport, ev, rlen);
4044 break;
4045 case ISCSI_UEVENT_NEW_FLASHNODE:
4046 err = iscsi_new_flashnode(transport, ev, rlen);
4047 break;
4048 case ISCSI_UEVENT_DEL_FLASHNODE:
4049 err = iscsi_del_flashnode(transport, ev);
4050 break;
4051 case ISCSI_UEVENT_LOGIN_FLASHNODE:
4052 err = iscsi_login_flashnode(transport, ev);
4053 break;
4054 case ISCSI_UEVENT_LOGOUT_FLASHNODE:
4055 err = iscsi_logout_flashnode(transport, ev);
4056 break;
4057 case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
4058 err = iscsi_logout_flashnode_sid(transport, ev);
4059 break;
4060 case ISCSI_UEVENT_SET_CHAP:
4061 err = iscsi_set_chap(transport, ev, rlen);
4062 break;
4063 case ISCSI_UEVENT_GET_HOST_STATS:
4064 err = iscsi_get_host_stats(transport, nlh);
4065 break;
4066 default:
4067 err = -ENOSYS;
4068 break;
4069 }
4070
4071 module_put(transport->owner);
4072 return err;
4073 }
4074
4075 /*
4076 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
4077 * Malformed skbs with wrong lengths or invalid creds are not processed.
4078 */
4079 static void
iscsi_if_rx(struct sk_buff * skb)4080 iscsi_if_rx(struct sk_buff *skb)
4081 {
4082 u32 portid = NETLINK_CB(skb).portid;
4083
4084 mutex_lock(&rx_queue_mutex);
4085 while (skb->len >= NLMSG_HDRLEN) {
4086 int err;
4087 uint32_t rlen;
4088 struct nlmsghdr *nlh;
4089 struct iscsi_uevent *ev;
4090 uint32_t group;
4091 int retries = ISCSI_SEND_MAX_ALLOWED;
4092
4093 nlh = nlmsg_hdr(skb);
4094 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4095 skb->len < nlh->nlmsg_len) {
4096 break;
4097 }
4098
4099 ev = nlmsg_data(nlh);
4100 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4101 if (rlen > skb->len)
4102 rlen = skb->len;
4103
4104 err = iscsi_if_recv_msg(skb, nlh, &group);
4105 if (err) {
4106 ev->type = ISCSI_KEVENT_IF_ERROR;
4107 ev->iferror = err;
4108 }
4109 do {
4110 /*
4111 * special case for GET_STATS, GET_CHAP and GET_HOST_STATS:
4112 * on success - sending reply and stats from
4113 * inside of if_recv_msg(),
4114 * on error - fall through.
4115 */
4116 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4117 break;
4118 if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4119 break;
4120 if (ev->type == ISCSI_UEVENT_GET_HOST_STATS && !err)
4121 break;
4122 err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4123 ev, sizeof(*ev));
4124 if (err == -EAGAIN && --retries < 0) {
4125 printk(KERN_WARNING "Send reply failed, error %d\n", err);
4126 break;
4127 }
4128 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4129 skb_pull(skb, rlen);
4130 }
4131 mutex_unlock(&rx_queue_mutex);
4132 }
4133
4134 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
4135 struct device_attribute dev_attr_##_prefix##_##_name = \
4136 __ATTR(_name,_mode,_show,_store)
4137
4138 /*
4139 * iSCSI connection attrs
4140 */
4141 #define iscsi_conn_attr_show(param) \
4142 static ssize_t \
4143 show_conn_param_##param(struct device *dev, \
4144 struct device_attribute *attr, char *buf) \
4145 { \
4146 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
4147 struct iscsi_transport *t = conn->transport; \
4148 return t->get_conn_param(conn, param, buf); \
4149 }
4150
4151 #define iscsi_conn_attr(field, param) \
4152 iscsi_conn_attr_show(param) \
4153 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
4154 NULL);
4155
4156 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4157 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4158 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4159 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4160 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4161 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4162 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4163 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4164 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4165 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4166 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4167 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4168 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4169 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4170 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4171 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4172 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4173 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4174 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4175 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4176 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4177 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4178 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4179 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4180 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4181 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4182 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4183 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4184
4185 static const char *const connection_state_names[] = {
4186 [ISCSI_CONN_UP] = "up",
4187 [ISCSI_CONN_DOWN] = "down",
4188 [ISCSI_CONN_FAILED] = "failed",
4189 [ISCSI_CONN_BOUND] = "bound"
4190 };
4191
show_conn_state(struct device * dev,struct device_attribute * attr,char * buf)4192 static ssize_t show_conn_state(struct device *dev,
4193 struct device_attribute *attr, char *buf)
4194 {
4195 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4196 const char *state = "unknown";
4197 int conn_state = READ_ONCE(conn->state);
4198
4199 if (conn_state >= 0 &&
4200 conn_state < ARRAY_SIZE(connection_state_names))
4201 state = connection_state_names[conn_state];
4202
4203 return sysfs_emit(buf, "%s\n", state);
4204 }
4205 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4206 NULL);
4207
4208 #define iscsi_conn_ep_attr_show(param) \
4209 static ssize_t show_conn_ep_param_##param(struct device *dev, \
4210 struct device_attribute *attr,\
4211 char *buf) \
4212 { \
4213 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
4214 struct iscsi_transport *t = conn->transport; \
4215 struct iscsi_endpoint *ep; \
4216 ssize_t rc; \
4217 \
4218 /* \
4219 * Need to make sure ep_disconnect does not free the LLD's \
4220 * interconnect resources while we are trying to read them. \
4221 */ \
4222 mutex_lock(&conn->ep_mutex); \
4223 ep = conn->ep; \
4224 if (!ep && t->ep_connect) { \
4225 mutex_unlock(&conn->ep_mutex); \
4226 return -ENOTCONN; \
4227 } \
4228 \
4229 if (ep) \
4230 rc = t->get_ep_param(ep, param, buf); \
4231 else \
4232 rc = t->get_conn_param(conn, param, buf); \
4233 mutex_unlock(&conn->ep_mutex); \
4234 return rc; \
4235 }
4236
4237 #define iscsi_conn_ep_attr(field, param) \
4238 iscsi_conn_ep_attr_show(param) \
4239 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
4240 show_conn_ep_param_##param, NULL);
4241
4242 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4243 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4244
4245 static struct attribute *iscsi_conn_attrs[] = {
4246 &dev_attr_conn_max_recv_dlength.attr,
4247 &dev_attr_conn_max_xmit_dlength.attr,
4248 &dev_attr_conn_header_digest.attr,
4249 &dev_attr_conn_data_digest.attr,
4250 &dev_attr_conn_ifmarker.attr,
4251 &dev_attr_conn_ofmarker.attr,
4252 &dev_attr_conn_address.attr,
4253 &dev_attr_conn_port.attr,
4254 &dev_attr_conn_exp_statsn.attr,
4255 &dev_attr_conn_persistent_address.attr,
4256 &dev_attr_conn_persistent_port.attr,
4257 &dev_attr_conn_ping_tmo.attr,
4258 &dev_attr_conn_recv_tmo.attr,
4259 &dev_attr_conn_local_port.attr,
4260 &dev_attr_conn_statsn.attr,
4261 &dev_attr_conn_keepalive_tmo.attr,
4262 &dev_attr_conn_max_segment_size.attr,
4263 &dev_attr_conn_tcp_timestamp_stat.attr,
4264 &dev_attr_conn_tcp_wsf_disable.attr,
4265 &dev_attr_conn_tcp_nagle_disable.attr,
4266 &dev_attr_conn_tcp_timer_scale.attr,
4267 &dev_attr_conn_tcp_timestamp_enable.attr,
4268 &dev_attr_conn_fragment_disable.attr,
4269 &dev_attr_conn_ipv4_tos.attr,
4270 &dev_attr_conn_ipv6_traffic_class.attr,
4271 &dev_attr_conn_ipv6_flow_label.attr,
4272 &dev_attr_conn_is_fw_assigned_ipv6.attr,
4273 &dev_attr_conn_tcp_xmit_wsf.attr,
4274 &dev_attr_conn_tcp_recv_wsf.attr,
4275 &dev_attr_conn_local_ipaddr.attr,
4276 &dev_attr_conn_state.attr,
4277 NULL,
4278 };
4279
iscsi_conn_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4280 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4281 struct attribute *attr, int i)
4282 {
4283 struct device *cdev = container_of(kobj, struct device, kobj);
4284 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4285 struct iscsi_transport *t = conn->transport;
4286 int param;
4287
4288 if (attr == &dev_attr_conn_max_recv_dlength.attr)
4289 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4290 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4291 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4292 else if (attr == &dev_attr_conn_header_digest.attr)
4293 param = ISCSI_PARAM_HDRDGST_EN;
4294 else if (attr == &dev_attr_conn_data_digest.attr)
4295 param = ISCSI_PARAM_DATADGST_EN;
4296 else if (attr == &dev_attr_conn_ifmarker.attr)
4297 param = ISCSI_PARAM_IFMARKER_EN;
4298 else if (attr == &dev_attr_conn_ofmarker.attr)
4299 param = ISCSI_PARAM_OFMARKER_EN;
4300 else if (attr == &dev_attr_conn_address.attr)
4301 param = ISCSI_PARAM_CONN_ADDRESS;
4302 else if (attr == &dev_attr_conn_port.attr)
4303 param = ISCSI_PARAM_CONN_PORT;
4304 else if (attr == &dev_attr_conn_exp_statsn.attr)
4305 param = ISCSI_PARAM_EXP_STATSN;
4306 else if (attr == &dev_attr_conn_persistent_address.attr)
4307 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4308 else if (attr == &dev_attr_conn_persistent_port.attr)
4309 param = ISCSI_PARAM_PERSISTENT_PORT;
4310 else if (attr == &dev_attr_conn_ping_tmo.attr)
4311 param = ISCSI_PARAM_PING_TMO;
4312 else if (attr == &dev_attr_conn_recv_tmo.attr)
4313 param = ISCSI_PARAM_RECV_TMO;
4314 else if (attr == &dev_attr_conn_local_port.attr)
4315 param = ISCSI_PARAM_LOCAL_PORT;
4316 else if (attr == &dev_attr_conn_statsn.attr)
4317 param = ISCSI_PARAM_STATSN;
4318 else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4319 param = ISCSI_PARAM_KEEPALIVE_TMO;
4320 else if (attr == &dev_attr_conn_max_segment_size.attr)
4321 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4322 else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4323 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4324 else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4325 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4326 else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4327 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4328 else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4329 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4330 else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4331 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4332 else if (attr == &dev_attr_conn_fragment_disable.attr)
4333 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4334 else if (attr == &dev_attr_conn_ipv4_tos.attr)
4335 param = ISCSI_PARAM_IPV4_TOS;
4336 else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4337 param = ISCSI_PARAM_IPV6_TC;
4338 else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4339 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4340 else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4341 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4342 else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4343 param = ISCSI_PARAM_TCP_XMIT_WSF;
4344 else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4345 param = ISCSI_PARAM_TCP_RECV_WSF;
4346 else if (attr == &dev_attr_conn_local_ipaddr.attr)
4347 param = ISCSI_PARAM_LOCAL_IPADDR;
4348 else if (attr == &dev_attr_conn_state.attr)
4349 return S_IRUGO;
4350 else {
4351 WARN_ONCE(1, "Invalid conn attr");
4352 return 0;
4353 }
4354
4355 return t->attr_is_visible(ISCSI_PARAM, param);
4356 }
4357
4358 static struct attribute_group iscsi_conn_group = {
4359 .attrs = iscsi_conn_attrs,
4360 .is_visible = iscsi_conn_attr_is_visible,
4361 };
4362
4363 /*
4364 * iSCSI session attrs
4365 */
4366 #define iscsi_session_attr_show(param, perm) \
4367 static ssize_t \
4368 show_session_param_##param(struct device *dev, \
4369 struct device_attribute *attr, char *buf) \
4370 { \
4371 struct iscsi_cls_session *session = \
4372 iscsi_dev_to_session(dev->parent); \
4373 struct iscsi_transport *t = session->transport; \
4374 \
4375 if (perm && !capable(CAP_SYS_ADMIN)) \
4376 return -EACCES; \
4377 return t->get_session_param(session, param, buf); \
4378 }
4379
4380 #define iscsi_session_attr(field, param, perm) \
4381 iscsi_session_attr_show(param, perm) \
4382 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4383 NULL);
4384 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4385 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4386 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4387 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4388 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4389 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4390 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4391 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4392 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4393 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4394 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4395 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4396 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4397 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4398 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4399 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4400 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4401 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4402 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4403 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4404 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4405 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4406 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4407 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4408 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4409 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4410 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4411 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4412 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4413 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4414 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4415 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4416 iscsi_session_attr(discovery_auth_optional,
4417 ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4418 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4419 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4420 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4421 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4422 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4423 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4424 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4425
4426 static ssize_t
show_priv_session_target_state(struct device * dev,struct device_attribute * attr,char * buf)4427 show_priv_session_target_state(struct device *dev, struct device_attribute *attr,
4428 char *buf)
4429 {
4430 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4431
4432 return sysfs_emit(buf, "%s\n",
4433 iscsi_session_target_state_name[session->target_state]);
4434 }
4435
4436 static ISCSI_CLASS_ATTR(priv_sess, target_state, S_IRUGO,
4437 show_priv_session_target_state, NULL);
4438
4439 static ssize_t
show_priv_session_state(struct device * dev,struct device_attribute * attr,char * buf)4440 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4441 char *buf)
4442 {
4443 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4444 return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4445 }
4446 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4447 NULL);
4448 static ssize_t
show_priv_session_creator(struct device * dev,struct device_attribute * attr,char * buf)4449 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4450 char *buf)
4451 {
4452 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4453 return sysfs_emit(buf, "%d\n", session->creator);
4454 }
4455 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4456 NULL);
4457 static ssize_t
show_priv_session_target_id(struct device * dev,struct device_attribute * attr,char * buf)4458 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4459 char *buf)
4460 {
4461 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4462 return sysfs_emit(buf, "%d\n", session->target_id);
4463 }
4464 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4465 show_priv_session_target_id, NULL);
4466
4467 #define iscsi_priv_session_attr_show(field, format) \
4468 static ssize_t \
4469 show_priv_session_##field(struct device *dev, \
4470 struct device_attribute *attr, char *buf) \
4471 { \
4472 struct iscsi_cls_session *session = \
4473 iscsi_dev_to_session(dev->parent); \
4474 if (session->field == -1) \
4475 return sysfs_emit(buf, "off\n"); \
4476 return sysfs_emit(buf, format"\n", session->field); \
4477 }
4478
4479 #define iscsi_priv_session_attr_store(field) \
4480 static ssize_t \
4481 store_priv_session_##field(struct device *dev, \
4482 struct device_attribute *attr, \
4483 const char *buf, size_t count) \
4484 { \
4485 int val; \
4486 char *cp; \
4487 struct iscsi_cls_session *session = \
4488 iscsi_dev_to_session(dev->parent); \
4489 if ((session->state == ISCSI_SESSION_FREE) || \
4490 (session->state == ISCSI_SESSION_FAILED)) \
4491 return -EBUSY; \
4492 if (strncmp(buf, "off", 3) == 0) { \
4493 session->field = -1; \
4494 session->field##_sysfs_override = true; \
4495 } else { \
4496 val = simple_strtoul(buf, &cp, 0); \
4497 if (*cp != '\0' && *cp != '\n') \
4498 return -EINVAL; \
4499 session->field = val; \
4500 session->field##_sysfs_override = true; \
4501 } \
4502 return count; \
4503 }
4504
4505 #define iscsi_priv_session_rw_attr(field, format) \
4506 iscsi_priv_session_attr_show(field, format) \
4507 iscsi_priv_session_attr_store(field) \
4508 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
4509 show_priv_session_##field, \
4510 store_priv_session_##field)
4511
4512 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4513
4514 static struct attribute *iscsi_session_attrs[] = {
4515 &dev_attr_sess_initial_r2t.attr,
4516 &dev_attr_sess_max_outstanding_r2t.attr,
4517 &dev_attr_sess_immediate_data.attr,
4518 &dev_attr_sess_first_burst_len.attr,
4519 &dev_attr_sess_max_burst_len.attr,
4520 &dev_attr_sess_data_pdu_in_order.attr,
4521 &dev_attr_sess_data_seq_in_order.attr,
4522 &dev_attr_sess_erl.attr,
4523 &dev_attr_sess_targetname.attr,
4524 &dev_attr_sess_tpgt.attr,
4525 &dev_attr_sess_password.attr,
4526 &dev_attr_sess_password_in.attr,
4527 &dev_attr_sess_username.attr,
4528 &dev_attr_sess_username_in.attr,
4529 &dev_attr_sess_fast_abort.attr,
4530 &dev_attr_sess_abort_tmo.attr,
4531 &dev_attr_sess_lu_reset_tmo.attr,
4532 &dev_attr_sess_tgt_reset_tmo.attr,
4533 &dev_attr_sess_ifacename.attr,
4534 &dev_attr_sess_initiatorname.attr,
4535 &dev_attr_sess_targetalias.attr,
4536 &dev_attr_sess_boot_root.attr,
4537 &dev_attr_sess_boot_nic.attr,
4538 &dev_attr_sess_boot_target.attr,
4539 &dev_attr_priv_sess_recovery_tmo.attr,
4540 &dev_attr_priv_sess_state.attr,
4541 &dev_attr_priv_sess_target_state.attr,
4542 &dev_attr_priv_sess_creator.attr,
4543 &dev_attr_sess_chap_out_idx.attr,
4544 &dev_attr_sess_chap_in_idx.attr,
4545 &dev_attr_priv_sess_target_id.attr,
4546 &dev_attr_sess_auto_snd_tgt_disable.attr,
4547 &dev_attr_sess_discovery_session.attr,
4548 &dev_attr_sess_portal_type.attr,
4549 &dev_attr_sess_chap_auth.attr,
4550 &dev_attr_sess_discovery_logout.attr,
4551 &dev_attr_sess_bidi_chap.attr,
4552 &dev_attr_sess_discovery_auth_optional.attr,
4553 &dev_attr_sess_def_time2wait.attr,
4554 &dev_attr_sess_def_time2retain.attr,
4555 &dev_attr_sess_isid.attr,
4556 &dev_attr_sess_tsid.attr,
4557 &dev_attr_sess_def_taskmgmt_tmo.attr,
4558 &dev_attr_sess_discovery_parent_idx.attr,
4559 &dev_attr_sess_discovery_parent_type.attr,
4560 NULL,
4561 };
4562
iscsi_session_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4563 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4564 struct attribute *attr, int i)
4565 {
4566 struct device *cdev = container_of(kobj, struct device, kobj);
4567 struct iscsi_cls_session *session = transport_class_to_session(cdev);
4568 struct iscsi_transport *t = session->transport;
4569 int param;
4570
4571 if (attr == &dev_attr_sess_initial_r2t.attr)
4572 param = ISCSI_PARAM_INITIAL_R2T_EN;
4573 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4574 param = ISCSI_PARAM_MAX_R2T;
4575 else if (attr == &dev_attr_sess_immediate_data.attr)
4576 param = ISCSI_PARAM_IMM_DATA_EN;
4577 else if (attr == &dev_attr_sess_first_burst_len.attr)
4578 param = ISCSI_PARAM_FIRST_BURST;
4579 else if (attr == &dev_attr_sess_max_burst_len.attr)
4580 param = ISCSI_PARAM_MAX_BURST;
4581 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4582 param = ISCSI_PARAM_PDU_INORDER_EN;
4583 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4584 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4585 else if (attr == &dev_attr_sess_erl.attr)
4586 param = ISCSI_PARAM_ERL;
4587 else if (attr == &dev_attr_sess_targetname.attr)
4588 param = ISCSI_PARAM_TARGET_NAME;
4589 else if (attr == &dev_attr_sess_tpgt.attr)
4590 param = ISCSI_PARAM_TPGT;
4591 else if (attr == &dev_attr_sess_chap_in_idx.attr)
4592 param = ISCSI_PARAM_CHAP_IN_IDX;
4593 else if (attr == &dev_attr_sess_chap_out_idx.attr)
4594 param = ISCSI_PARAM_CHAP_OUT_IDX;
4595 else if (attr == &dev_attr_sess_password.attr)
4596 param = ISCSI_PARAM_USERNAME;
4597 else if (attr == &dev_attr_sess_password_in.attr)
4598 param = ISCSI_PARAM_USERNAME_IN;
4599 else if (attr == &dev_attr_sess_username.attr)
4600 param = ISCSI_PARAM_PASSWORD;
4601 else if (attr == &dev_attr_sess_username_in.attr)
4602 param = ISCSI_PARAM_PASSWORD_IN;
4603 else if (attr == &dev_attr_sess_fast_abort.attr)
4604 param = ISCSI_PARAM_FAST_ABORT;
4605 else if (attr == &dev_attr_sess_abort_tmo.attr)
4606 param = ISCSI_PARAM_ABORT_TMO;
4607 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4608 param = ISCSI_PARAM_LU_RESET_TMO;
4609 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4610 param = ISCSI_PARAM_TGT_RESET_TMO;
4611 else if (attr == &dev_attr_sess_ifacename.attr)
4612 param = ISCSI_PARAM_IFACE_NAME;
4613 else if (attr == &dev_attr_sess_initiatorname.attr)
4614 param = ISCSI_PARAM_INITIATOR_NAME;
4615 else if (attr == &dev_attr_sess_targetalias.attr)
4616 param = ISCSI_PARAM_TARGET_ALIAS;
4617 else if (attr == &dev_attr_sess_boot_root.attr)
4618 param = ISCSI_PARAM_BOOT_ROOT;
4619 else if (attr == &dev_attr_sess_boot_nic.attr)
4620 param = ISCSI_PARAM_BOOT_NIC;
4621 else if (attr == &dev_attr_sess_boot_target.attr)
4622 param = ISCSI_PARAM_BOOT_TARGET;
4623 else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4624 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4625 else if (attr == &dev_attr_sess_discovery_session.attr)
4626 param = ISCSI_PARAM_DISCOVERY_SESS;
4627 else if (attr == &dev_attr_sess_portal_type.attr)
4628 param = ISCSI_PARAM_PORTAL_TYPE;
4629 else if (attr == &dev_attr_sess_chap_auth.attr)
4630 param = ISCSI_PARAM_CHAP_AUTH_EN;
4631 else if (attr == &dev_attr_sess_discovery_logout.attr)
4632 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4633 else if (attr == &dev_attr_sess_bidi_chap.attr)
4634 param = ISCSI_PARAM_BIDI_CHAP_EN;
4635 else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4636 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4637 else if (attr == &dev_attr_sess_def_time2wait.attr)
4638 param = ISCSI_PARAM_DEF_TIME2WAIT;
4639 else if (attr == &dev_attr_sess_def_time2retain.attr)
4640 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4641 else if (attr == &dev_attr_sess_isid.attr)
4642 param = ISCSI_PARAM_ISID;
4643 else if (attr == &dev_attr_sess_tsid.attr)
4644 param = ISCSI_PARAM_TSID;
4645 else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4646 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4647 else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4648 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4649 else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4650 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4651 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4652 return S_IRUGO | S_IWUSR;
4653 else if (attr == &dev_attr_priv_sess_state.attr)
4654 return S_IRUGO;
4655 else if (attr == &dev_attr_priv_sess_target_state.attr)
4656 return S_IRUGO;
4657 else if (attr == &dev_attr_priv_sess_creator.attr)
4658 return S_IRUGO;
4659 else if (attr == &dev_attr_priv_sess_target_id.attr)
4660 return S_IRUGO;
4661 else {
4662 WARN_ONCE(1, "Invalid session attr");
4663 return 0;
4664 }
4665
4666 return t->attr_is_visible(ISCSI_PARAM, param);
4667 }
4668
4669 static struct attribute_group iscsi_session_group = {
4670 .attrs = iscsi_session_attrs,
4671 .is_visible = iscsi_session_attr_is_visible,
4672 };
4673
4674 /*
4675 * iSCSI host attrs
4676 */
4677 #define iscsi_host_attr_show(param) \
4678 static ssize_t \
4679 show_host_param_##param(struct device *dev, \
4680 struct device_attribute *attr, char *buf) \
4681 { \
4682 struct Scsi_Host *shost = transport_class_to_shost(dev); \
4683 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4684 return priv->iscsi_transport->get_host_param(shost, param, buf); \
4685 }
4686
4687 #define iscsi_host_attr(field, param) \
4688 iscsi_host_attr_show(param) \
4689 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
4690 NULL);
4691
4692 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4693 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4694 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4695 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4696 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4697 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4698
4699 static struct attribute *iscsi_host_attrs[] = {
4700 &dev_attr_host_netdev.attr,
4701 &dev_attr_host_hwaddress.attr,
4702 &dev_attr_host_ipaddress.attr,
4703 &dev_attr_host_initiatorname.attr,
4704 &dev_attr_host_port_state.attr,
4705 &dev_attr_host_port_speed.attr,
4706 NULL,
4707 };
4708
iscsi_host_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4709 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4710 struct attribute *attr, int i)
4711 {
4712 struct device *cdev = container_of(kobj, struct device, kobj);
4713 struct Scsi_Host *shost = transport_class_to_shost(cdev);
4714 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4715 int param;
4716
4717 if (attr == &dev_attr_host_netdev.attr)
4718 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4719 else if (attr == &dev_attr_host_hwaddress.attr)
4720 param = ISCSI_HOST_PARAM_HWADDRESS;
4721 else if (attr == &dev_attr_host_ipaddress.attr)
4722 param = ISCSI_HOST_PARAM_IPADDRESS;
4723 else if (attr == &dev_attr_host_initiatorname.attr)
4724 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4725 else if (attr == &dev_attr_host_port_state.attr)
4726 param = ISCSI_HOST_PARAM_PORT_STATE;
4727 else if (attr == &dev_attr_host_port_speed.attr)
4728 param = ISCSI_HOST_PARAM_PORT_SPEED;
4729 else {
4730 WARN_ONCE(1, "Invalid host attr");
4731 return 0;
4732 }
4733
4734 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4735 }
4736
4737 static struct attribute_group iscsi_host_group = {
4738 .attrs = iscsi_host_attrs,
4739 .is_visible = iscsi_host_attr_is_visible,
4740 };
4741
4742 /* convert iscsi_port_speed values to ascii string name */
4743 static const struct {
4744 enum iscsi_port_speed value;
4745 char *name;
4746 } iscsi_port_speed_names[] = {
4747 {ISCSI_PORT_SPEED_UNKNOWN, "Unknown" },
4748 {ISCSI_PORT_SPEED_10MBPS, "10 Mbps" },
4749 {ISCSI_PORT_SPEED_100MBPS, "100 Mbps" },
4750 {ISCSI_PORT_SPEED_1GBPS, "1 Gbps" },
4751 {ISCSI_PORT_SPEED_10GBPS, "10 Gbps" },
4752 {ISCSI_PORT_SPEED_25GBPS, "25 Gbps" },
4753 {ISCSI_PORT_SPEED_40GBPS, "40 Gbps" },
4754 };
4755
iscsi_get_port_speed_name(struct Scsi_Host * shost)4756 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4757 {
4758 int i;
4759 char *speed = "Unknown!";
4760 struct iscsi_cls_host *ihost = shost->shost_data;
4761 uint32_t port_speed = ihost->port_speed;
4762
4763 for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4764 if (iscsi_port_speed_names[i].value & port_speed) {
4765 speed = iscsi_port_speed_names[i].name;
4766 break;
4767 }
4768 }
4769 return speed;
4770 }
4771 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4772
4773 /* convert iscsi_port_state values to ascii string name */
4774 static const struct {
4775 enum iscsi_port_state value;
4776 char *name;
4777 } iscsi_port_state_names[] = {
4778 {ISCSI_PORT_STATE_DOWN, "LINK DOWN" },
4779 {ISCSI_PORT_STATE_UP, "LINK UP" },
4780 };
4781
iscsi_get_port_state_name(struct Scsi_Host * shost)4782 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4783 {
4784 int i;
4785 char *state = "Unknown!";
4786 struct iscsi_cls_host *ihost = shost->shost_data;
4787 uint32_t port_state = ihost->port_state;
4788
4789 for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4790 if (iscsi_port_state_names[i].value & port_state) {
4791 state = iscsi_port_state_names[i].name;
4792 break;
4793 }
4794 }
4795 return state;
4796 }
4797 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4798
iscsi_session_match(struct attribute_container * cont,struct device * dev)4799 static int iscsi_session_match(struct attribute_container *cont,
4800 struct device *dev)
4801 {
4802 struct iscsi_cls_session *session;
4803 struct Scsi_Host *shost;
4804 struct iscsi_internal *priv;
4805
4806 if (!iscsi_is_session_dev(dev))
4807 return 0;
4808
4809 session = iscsi_dev_to_session(dev);
4810 shost = iscsi_session_to_shost(session);
4811 if (!shost->transportt)
4812 return 0;
4813
4814 priv = to_iscsi_internal(shost->transportt);
4815 if (priv->session_cont.ac.class != &iscsi_session_class.class)
4816 return 0;
4817
4818 return &priv->session_cont.ac == cont;
4819 }
4820
iscsi_conn_match(struct attribute_container * cont,struct device * dev)4821 static int iscsi_conn_match(struct attribute_container *cont,
4822 struct device *dev)
4823 {
4824 struct iscsi_cls_session *session;
4825 struct iscsi_cls_conn *conn;
4826 struct Scsi_Host *shost;
4827 struct iscsi_internal *priv;
4828
4829 if (!iscsi_is_conn_dev(dev))
4830 return 0;
4831
4832 conn = iscsi_dev_to_conn(dev);
4833 session = iscsi_dev_to_session(conn->dev.parent);
4834 shost = iscsi_session_to_shost(session);
4835
4836 if (!shost->transportt)
4837 return 0;
4838
4839 priv = to_iscsi_internal(shost->transportt);
4840 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4841 return 0;
4842
4843 return &priv->conn_cont.ac == cont;
4844 }
4845
iscsi_host_match(struct attribute_container * cont,struct device * dev)4846 static int iscsi_host_match(struct attribute_container *cont,
4847 struct device *dev)
4848 {
4849 struct Scsi_Host *shost;
4850 struct iscsi_internal *priv;
4851
4852 if (!scsi_is_host_device(dev))
4853 return 0;
4854
4855 shost = dev_to_shost(dev);
4856 if (!shost->transportt ||
4857 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4858 return 0;
4859
4860 priv = to_iscsi_internal(shost->transportt);
4861 return &priv->t.host_attrs.ac == cont;
4862 }
4863
4864 struct scsi_transport_template *
iscsi_register_transport(struct iscsi_transport * tt)4865 iscsi_register_transport(struct iscsi_transport *tt)
4866 {
4867 struct iscsi_internal *priv;
4868 unsigned long flags;
4869 int err;
4870
4871 BUG_ON(!tt);
4872 WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4873
4874 priv = iscsi_if_transport_lookup(tt);
4875 if (priv)
4876 return NULL;
4877
4878 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4879 if (!priv)
4880 return NULL;
4881 INIT_LIST_HEAD(&priv->list);
4882 priv->iscsi_transport = tt;
4883 priv->t.user_scan = iscsi_user_scan;
4884
4885 priv->dev.class = &iscsi_transport_class;
4886 dev_set_name(&priv->dev, "%s", tt->name);
4887 err = device_register(&priv->dev);
4888 if (err)
4889 goto put_dev;
4890
4891 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4892 if (err)
4893 goto unregister_dev;
4894
4895 /* host parameters */
4896 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4897 priv->t.host_attrs.ac.match = iscsi_host_match;
4898 priv->t.host_attrs.ac.grp = &iscsi_host_group;
4899 priv->t.host_size = sizeof(struct iscsi_cls_host);
4900 transport_container_register(&priv->t.host_attrs);
4901
4902 /* connection parameters */
4903 priv->conn_cont.ac.class = &iscsi_connection_class.class;
4904 priv->conn_cont.ac.match = iscsi_conn_match;
4905 priv->conn_cont.ac.grp = &iscsi_conn_group;
4906 transport_container_register(&priv->conn_cont);
4907
4908 /* session parameters */
4909 priv->session_cont.ac.class = &iscsi_session_class.class;
4910 priv->session_cont.ac.match = iscsi_session_match;
4911 priv->session_cont.ac.grp = &iscsi_session_group;
4912 transport_container_register(&priv->session_cont);
4913
4914 spin_lock_irqsave(&iscsi_transport_lock, flags);
4915 list_add(&priv->list, &iscsi_transports);
4916 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4917
4918 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4919 return &priv->t;
4920
4921 unregister_dev:
4922 device_unregister(&priv->dev);
4923 return NULL;
4924 put_dev:
4925 put_device(&priv->dev);
4926 return NULL;
4927 }
4928 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4929
iscsi_unregister_transport(struct iscsi_transport * tt)4930 void iscsi_unregister_transport(struct iscsi_transport *tt)
4931 {
4932 struct iscsi_internal *priv;
4933 unsigned long flags;
4934
4935 BUG_ON(!tt);
4936
4937 mutex_lock(&rx_queue_mutex);
4938
4939 priv = iscsi_if_transport_lookup(tt);
4940 BUG_ON (!priv);
4941
4942 spin_lock_irqsave(&iscsi_transport_lock, flags);
4943 list_del(&priv->list);
4944 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4945
4946 transport_container_unregister(&priv->conn_cont);
4947 transport_container_unregister(&priv->session_cont);
4948 transport_container_unregister(&priv->t.host_attrs);
4949
4950 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4951 device_unregister(&priv->dev);
4952 mutex_unlock(&rx_queue_mutex);
4953 }
4954 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4955
iscsi_dbg_trace(void (* trace)(struct device * dev,struct va_format *),struct device * dev,const char * fmt,...)4956 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4957 struct device *dev, const char *fmt, ...)
4958 {
4959 struct va_format vaf;
4960 va_list args;
4961
4962 va_start(args, fmt);
4963 vaf.fmt = fmt;
4964 vaf.va = &args;
4965 trace(dev, &vaf);
4966 va_end(args);
4967 }
4968 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4969
iscsi_transport_init(void)4970 static __init int iscsi_transport_init(void)
4971 {
4972 int err;
4973 struct netlink_kernel_cfg cfg = {
4974 .groups = 1,
4975 .input = iscsi_if_rx,
4976 };
4977 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4978 ISCSI_TRANSPORT_VERSION);
4979
4980 atomic_set(&iscsi_session_nr, 0);
4981
4982 err = class_register(&iscsi_transport_class);
4983 if (err)
4984 return err;
4985
4986 err = class_register(&iscsi_endpoint_class);
4987 if (err)
4988 goto unregister_transport_class;
4989
4990 err = class_register(&iscsi_iface_class);
4991 if (err)
4992 goto unregister_endpoint_class;
4993
4994 err = transport_class_register(&iscsi_host_class);
4995 if (err)
4996 goto unregister_iface_class;
4997
4998 err = transport_class_register(&iscsi_connection_class);
4999 if (err)
5000 goto unregister_host_class;
5001
5002 err = transport_class_register(&iscsi_session_class);
5003 if (err)
5004 goto unregister_conn_class;
5005
5006 err = bus_register(&iscsi_flashnode_bus);
5007 if (err)
5008 goto unregister_session_class;
5009
5010 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
5011 if (!nls) {
5012 err = -ENOBUFS;
5013 goto unregister_flashnode_bus;
5014 }
5015
5016 iscsi_conn_cleanup_workq = alloc_workqueue("%s",
5017 WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
5018 "iscsi_conn_cleanup");
5019 if (!iscsi_conn_cleanup_workq) {
5020 err = -ENOMEM;
5021 goto release_nls;
5022 }
5023
5024 return 0;
5025
5026 release_nls:
5027 netlink_kernel_release(nls);
5028 unregister_flashnode_bus:
5029 bus_unregister(&iscsi_flashnode_bus);
5030 unregister_session_class:
5031 transport_class_unregister(&iscsi_session_class);
5032 unregister_conn_class:
5033 transport_class_unregister(&iscsi_connection_class);
5034 unregister_host_class:
5035 transport_class_unregister(&iscsi_host_class);
5036 unregister_iface_class:
5037 class_unregister(&iscsi_iface_class);
5038 unregister_endpoint_class:
5039 class_unregister(&iscsi_endpoint_class);
5040 unregister_transport_class:
5041 class_unregister(&iscsi_transport_class);
5042 return err;
5043 }
5044
iscsi_transport_exit(void)5045 static void __exit iscsi_transport_exit(void)
5046 {
5047 destroy_workqueue(iscsi_conn_cleanup_workq);
5048 netlink_kernel_release(nls);
5049 bus_unregister(&iscsi_flashnode_bus);
5050 transport_class_unregister(&iscsi_connection_class);
5051 transport_class_unregister(&iscsi_session_class);
5052 transport_class_unregister(&iscsi_host_class);
5053 class_unregister(&iscsi_endpoint_class);
5054 class_unregister(&iscsi_iface_class);
5055 class_unregister(&iscsi_transport_class);
5056 }
5057
5058 module_init(iscsi_transport_init);
5059 module_exit(iscsi_transport_exit);
5060
5061 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
5062 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
5063 "Alex Aizman <itn780@yahoo.com>");
5064 MODULE_DESCRIPTION("iSCSI Transport Interface");
5065 MODULE_LICENSE("GPL");
5066 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
5067 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
5068