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 atomic_t iscsi_session_nr; /* sysfs session id for next new session */
90 static struct workqueue_struct *iscsi_eh_timer_workq;
91
92 static struct workqueue_struct *iscsi_conn_cleanup_workq;
93
94 static DEFINE_IDA(iscsi_sess_ida);
95 /*
96 * list of registered transports and lock that must
97 * be held while accessing list. The iscsi_transport_lock must
98 * be acquired after the rx_queue_mutex.
99 */
100 static LIST_HEAD(iscsi_transports);
101 static DEFINE_SPINLOCK(iscsi_transport_lock);
102
103 #define to_iscsi_internal(tmpl) \
104 container_of(tmpl, struct iscsi_internal, t)
105
106 #define dev_to_iscsi_internal(_dev) \
107 container_of(_dev, struct iscsi_internal, dev)
108
iscsi_transport_release(struct device * dev)109 static void iscsi_transport_release(struct device *dev)
110 {
111 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
112 kfree(priv);
113 }
114
115 /*
116 * iscsi_transport_class represents the iscsi_transports that are
117 * registered.
118 */
119 static struct class iscsi_transport_class = {
120 .name = "iscsi_transport",
121 .dev_release = iscsi_transport_release,
122 };
123
124 static ssize_t
show_transport_handle(struct device * dev,struct device_attribute * attr,char * buf)125 show_transport_handle(struct device *dev, struct device_attribute *attr,
126 char *buf)
127 {
128 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
129
130 if (!capable(CAP_SYS_ADMIN))
131 return -EACCES;
132 return sysfs_emit(buf, "%llu\n",
133 (unsigned long long)iscsi_handle(priv->iscsi_transport));
134 }
135 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
136
137 #define show_transport_attr(name, format) \
138 static ssize_t \
139 show_transport_##name(struct device *dev, \
140 struct device_attribute *attr,char *buf) \
141 { \
142 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
143 return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
144 } \
145 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
146
147 show_transport_attr(caps, "0x%x");
148
149 static struct attribute *iscsi_transport_attrs[] = {
150 &dev_attr_handle.attr,
151 &dev_attr_caps.attr,
152 NULL,
153 };
154
155 static struct attribute_group iscsi_transport_group = {
156 .attrs = iscsi_transport_attrs,
157 };
158
159 /*
160 * iSCSI endpoint attrs
161 */
162 #define iscsi_dev_to_endpoint(_dev) \
163 container_of(_dev, struct iscsi_endpoint, dev)
164
165 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
166 struct device_attribute dev_attr_##_prefix##_##_name = \
167 __ATTR(_name,_mode,_show,_store)
168
iscsi_endpoint_release(struct device * dev)169 static void iscsi_endpoint_release(struct device *dev)
170 {
171 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
172 kfree(ep);
173 }
174
175 static struct class iscsi_endpoint_class = {
176 .name = "iscsi_endpoint",
177 .dev_release = iscsi_endpoint_release,
178 };
179
180 static ssize_t
show_ep_handle(struct device * dev,struct device_attribute * attr,char * buf)181 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
182 {
183 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
184 return sysfs_emit(buf, "%llu\n", (unsigned long long) ep->id);
185 }
186 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
187
188 static struct attribute *iscsi_endpoint_attrs[] = {
189 &dev_attr_ep_handle.attr,
190 NULL,
191 };
192
193 static struct attribute_group iscsi_endpoint_group = {
194 .attrs = iscsi_endpoint_attrs,
195 };
196
197 #define ISCSI_MAX_EPID -1
198
iscsi_match_epid(struct device * dev,const void * data)199 static int iscsi_match_epid(struct device *dev, const void *data)
200 {
201 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
202 const uint64_t *epid = data;
203
204 return *epid == ep->id;
205 }
206
207 struct iscsi_endpoint *
iscsi_create_endpoint(int dd_size)208 iscsi_create_endpoint(int dd_size)
209 {
210 struct device *dev;
211 struct iscsi_endpoint *ep;
212 uint64_t id;
213 int err;
214
215 for (id = 1; id < ISCSI_MAX_EPID; id++) {
216 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
217 iscsi_match_epid);
218 if (!dev)
219 break;
220 else
221 put_device(dev);
222 }
223 if (id == ISCSI_MAX_EPID) {
224 printk(KERN_ERR "Too many connections. Max supported %u\n",
225 ISCSI_MAX_EPID - 1);
226 return NULL;
227 }
228
229 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
230 if (!ep)
231 return NULL;
232
233 ep->id = id;
234 ep->dev.class = &iscsi_endpoint_class;
235 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
236 err = device_register(&ep->dev);
237 if (err)
238 goto free_ep;
239
240 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
241 if (err)
242 goto unregister_dev;
243
244 if (dd_size)
245 ep->dd_data = &ep[1];
246 return ep;
247
248 unregister_dev:
249 device_unregister(&ep->dev);
250 return NULL;
251
252 free_ep:
253 kfree(ep);
254 return NULL;
255 }
256 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
257
iscsi_destroy_endpoint(struct iscsi_endpoint * ep)258 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
259 {
260 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
261 device_unregister(&ep->dev);
262 }
263 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
264
iscsi_put_endpoint(struct iscsi_endpoint * ep)265 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
266 {
267 put_device(&ep->dev);
268 }
269 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
270
271 /**
272 * iscsi_lookup_endpoint - get ep from handle
273 * @handle: endpoint handle
274 *
275 * Caller must do a iscsi_put_endpoint.
276 */
iscsi_lookup_endpoint(u64 handle)277 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
278 {
279 struct device *dev;
280
281 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
282 iscsi_match_epid);
283 if (!dev)
284 return NULL;
285
286 return iscsi_dev_to_endpoint(dev);
287 }
288 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
289
290 /*
291 * Interface to display network param to sysfs
292 */
293
iscsi_iface_release(struct device * dev)294 static void iscsi_iface_release(struct device *dev)
295 {
296 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
297 struct device *parent = iface->dev.parent;
298
299 kfree(iface);
300 put_device(parent);
301 }
302
303
304 static struct class iscsi_iface_class = {
305 .name = "iscsi_iface",
306 .dev_release = iscsi_iface_release,
307 };
308
309 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
310 struct device_attribute dev_attr_##_prefix##_##_name = \
311 __ATTR(_name, _mode, _show, _store)
312
313 /* iface attrs show */
314 #define iscsi_iface_attr_show(type, name, param_type, param) \
315 static ssize_t \
316 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
317 char *buf) \
318 { \
319 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
320 struct iscsi_transport *t = iface->transport; \
321 return t->get_iface_param(iface, param_type, param, buf); \
322 } \
323
324 #define iscsi_iface_net_attr(type, name, param) \
325 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
326 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
327
328 #define iscsi_iface_attr(type, name, param) \
329 iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param) \
330 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
331
332 /* generic read only ipv4 attribute */
333 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
334 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
335 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
336 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
337 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
338 ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
339 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
340 ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
341 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
342 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
343 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
344 ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
345 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
346 ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
347 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
348 ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
349 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
350 ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
351 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
352 ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
353 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
354 ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
355 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
356 ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
357 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
358 ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
359 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
360 ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
361 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
362
363 /* generic read only ipv6 attribute */
364 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
365 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
366 ISCSI_NET_PARAM_IPV6_LINKLOCAL);
367 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
368 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
369 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
370 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
371 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
372 iscsi_iface_net_attr(ipv6_iface, link_local_state,
373 ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
374 iscsi_iface_net_attr(ipv6_iface, router_state,
375 ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
376 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
377 ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
378 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
379 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
380 iscsi_iface_net_attr(ipv6_iface, traffic_class,
381 ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
382 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
383 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
384 ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
385 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
386 ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
387 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
388 ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
389 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
390 ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
391 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
392 ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
393
394 /* common read only iface attribute */
395 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
396 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
397 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
398 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
399 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
400 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
401 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
402 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
403 iscsi_iface_net_attr(iface, tcp_nagle_disable,
404 ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
405 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
406 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
407 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
408 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
409 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
410 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
411
412 /* common iscsi specific settings attributes */
413 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
414 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
415 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
416 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
417 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
418 iscsi_iface_attr(iface, data_seq_in_order,
419 ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
420 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
421 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
422 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
423 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
424 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
425 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
426 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
427 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
428 iscsi_iface_attr(iface, discovery_auth_optional,
429 ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
430 iscsi_iface_attr(iface, discovery_logout,
431 ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
432 iscsi_iface_attr(iface, strict_login_comp_en,
433 ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
434 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
435
iscsi_iface_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)436 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
437 struct attribute *attr, int i)
438 {
439 struct device *dev = container_of(kobj, struct device, kobj);
440 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
441 struct iscsi_transport *t = iface->transport;
442 int param = -1;
443
444 if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
445 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
446 else if (attr == &dev_attr_iface_header_digest.attr)
447 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
448 else if (attr == &dev_attr_iface_data_digest.attr)
449 param = ISCSI_IFACE_PARAM_DATADGST_EN;
450 else if (attr == &dev_attr_iface_immediate_data.attr)
451 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
452 else if (attr == &dev_attr_iface_initial_r2t.attr)
453 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
454 else if (attr == &dev_attr_iface_data_seq_in_order.attr)
455 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
456 else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
457 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
458 else if (attr == &dev_attr_iface_erl.attr)
459 param = ISCSI_IFACE_PARAM_ERL;
460 else if (attr == &dev_attr_iface_max_recv_dlength.attr)
461 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
462 else if (attr == &dev_attr_iface_first_burst_len.attr)
463 param = ISCSI_IFACE_PARAM_FIRST_BURST;
464 else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
465 param = ISCSI_IFACE_PARAM_MAX_R2T;
466 else if (attr == &dev_attr_iface_max_burst_len.attr)
467 param = ISCSI_IFACE_PARAM_MAX_BURST;
468 else if (attr == &dev_attr_iface_chap_auth.attr)
469 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
470 else if (attr == &dev_attr_iface_bidi_chap.attr)
471 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
472 else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
473 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
474 else if (attr == &dev_attr_iface_discovery_logout.attr)
475 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
476 else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
477 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
478 else if (attr == &dev_attr_iface_initiator_name.attr)
479 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
480
481 if (param != -1)
482 return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
483
484 if (attr == &dev_attr_iface_enabled.attr)
485 param = ISCSI_NET_PARAM_IFACE_ENABLE;
486 else if (attr == &dev_attr_iface_vlan_id.attr)
487 param = ISCSI_NET_PARAM_VLAN_ID;
488 else if (attr == &dev_attr_iface_vlan_priority.attr)
489 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
490 else if (attr == &dev_attr_iface_vlan_enabled.attr)
491 param = ISCSI_NET_PARAM_VLAN_ENABLED;
492 else if (attr == &dev_attr_iface_mtu.attr)
493 param = ISCSI_NET_PARAM_MTU;
494 else if (attr == &dev_attr_iface_port.attr)
495 param = ISCSI_NET_PARAM_PORT;
496 else if (attr == &dev_attr_iface_ipaddress_state.attr)
497 param = ISCSI_NET_PARAM_IPADDR_STATE;
498 else if (attr == &dev_attr_iface_delayed_ack_en.attr)
499 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
500 else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
501 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
502 else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
503 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
504 else if (attr == &dev_attr_iface_tcp_wsf.attr)
505 param = ISCSI_NET_PARAM_TCP_WSF;
506 else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
507 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
508 else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
509 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
510 else if (attr == &dev_attr_iface_cache_id.attr)
511 param = ISCSI_NET_PARAM_CACHE_ID;
512 else if (attr == &dev_attr_iface_redirect_en.attr)
513 param = ISCSI_NET_PARAM_REDIRECT_EN;
514 else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
515 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
516 param = ISCSI_NET_PARAM_IPV4_ADDR;
517 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
518 param = ISCSI_NET_PARAM_IPV4_GW;
519 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
520 param = ISCSI_NET_PARAM_IPV4_SUBNET;
521 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
522 param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
523 else if (attr ==
524 &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
525 param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
526 else if (attr ==
527 &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
528 param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
529 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
530 param = ISCSI_NET_PARAM_IPV4_TOS_EN;
531 else if (attr == &dev_attr_ipv4_iface_tos.attr)
532 param = ISCSI_NET_PARAM_IPV4_TOS;
533 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
534 param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
535 else if (attr ==
536 &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
537 param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
538 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
539 param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
540 else if (attr ==
541 &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
542 param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
543 else if (attr ==
544 &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
545 param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
546 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
547 param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
548 else if (attr ==
549 &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
550 param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
551 else if (attr ==
552 &dev_attr_ipv4_iface_fragment_disable.attr)
553 param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
554 else if (attr ==
555 &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
556 param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
557 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
558 param = ISCSI_NET_PARAM_IPV4_TTL;
559 else
560 return 0;
561 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
562 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
563 param = ISCSI_NET_PARAM_IPV6_ADDR;
564 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
565 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
566 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
567 param = ISCSI_NET_PARAM_IPV6_ROUTER;
568 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
569 param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
570 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
571 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
572 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
573 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
574 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
575 param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
576 else if (attr ==
577 &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
578 param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
579 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
580 param = ISCSI_NET_PARAM_IPV6_MLD_EN;
581 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
582 param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
583 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
584 param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
585 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
586 param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
587 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
588 param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
589 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
590 param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
591 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
592 param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
593 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
594 param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
595 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
596 param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
597 else
598 return 0;
599 } else {
600 WARN_ONCE(1, "Invalid iface attr");
601 return 0;
602 }
603
604 return t->attr_is_visible(ISCSI_NET_PARAM, param);
605 }
606
607 static struct attribute *iscsi_iface_attrs[] = {
608 &dev_attr_iface_enabled.attr,
609 &dev_attr_iface_vlan_id.attr,
610 &dev_attr_iface_vlan_priority.attr,
611 &dev_attr_iface_vlan_enabled.attr,
612 &dev_attr_ipv4_iface_ipaddress.attr,
613 &dev_attr_ipv4_iface_gateway.attr,
614 &dev_attr_ipv4_iface_subnet.attr,
615 &dev_attr_ipv4_iface_bootproto.attr,
616 &dev_attr_ipv6_iface_ipaddress.attr,
617 &dev_attr_ipv6_iface_link_local_addr.attr,
618 &dev_attr_ipv6_iface_router_addr.attr,
619 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
620 &dev_attr_ipv6_iface_link_local_autocfg.attr,
621 &dev_attr_iface_mtu.attr,
622 &dev_attr_iface_port.attr,
623 &dev_attr_iface_ipaddress_state.attr,
624 &dev_attr_iface_delayed_ack_en.attr,
625 &dev_attr_iface_tcp_nagle_disable.attr,
626 &dev_attr_iface_tcp_wsf_disable.attr,
627 &dev_attr_iface_tcp_wsf.attr,
628 &dev_attr_iface_tcp_timer_scale.attr,
629 &dev_attr_iface_tcp_timestamp_en.attr,
630 &dev_attr_iface_cache_id.attr,
631 &dev_attr_iface_redirect_en.attr,
632 &dev_attr_iface_def_taskmgmt_tmo.attr,
633 &dev_attr_iface_header_digest.attr,
634 &dev_attr_iface_data_digest.attr,
635 &dev_attr_iface_immediate_data.attr,
636 &dev_attr_iface_initial_r2t.attr,
637 &dev_attr_iface_data_seq_in_order.attr,
638 &dev_attr_iface_data_pdu_in_order.attr,
639 &dev_attr_iface_erl.attr,
640 &dev_attr_iface_max_recv_dlength.attr,
641 &dev_attr_iface_first_burst_len.attr,
642 &dev_attr_iface_max_outstanding_r2t.attr,
643 &dev_attr_iface_max_burst_len.attr,
644 &dev_attr_iface_chap_auth.attr,
645 &dev_attr_iface_bidi_chap.attr,
646 &dev_attr_iface_discovery_auth_optional.attr,
647 &dev_attr_iface_discovery_logout.attr,
648 &dev_attr_iface_strict_login_comp_en.attr,
649 &dev_attr_iface_initiator_name.attr,
650 &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
651 &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
652 &dev_attr_ipv4_iface_tos_en.attr,
653 &dev_attr_ipv4_iface_tos.attr,
654 &dev_attr_ipv4_iface_grat_arp_en.attr,
655 &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
656 &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
657 &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
658 &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
659 &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
660 &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
661 &dev_attr_ipv4_iface_fragment_disable.attr,
662 &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
663 &dev_attr_ipv4_iface_ttl.attr,
664 &dev_attr_ipv6_iface_link_local_state.attr,
665 &dev_attr_ipv6_iface_router_state.attr,
666 &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
667 &dev_attr_ipv6_iface_mld_en.attr,
668 &dev_attr_ipv6_iface_flow_label.attr,
669 &dev_attr_ipv6_iface_traffic_class.attr,
670 &dev_attr_ipv6_iface_hop_limit.attr,
671 &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
672 &dev_attr_ipv6_iface_nd_rexmit_time.attr,
673 &dev_attr_ipv6_iface_nd_stale_tmo.attr,
674 &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
675 &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
676 NULL,
677 };
678
679 static struct attribute_group iscsi_iface_group = {
680 .attrs = iscsi_iface_attrs,
681 .is_visible = iscsi_iface_attr_is_visible,
682 };
683
684 /* convert iscsi_ipaddress_state values to ascii string name */
685 static const struct {
686 enum iscsi_ipaddress_state value;
687 char *name;
688 } iscsi_ipaddress_state_names[] = {
689 {ISCSI_IPDDRESS_STATE_UNCONFIGURED, "Unconfigured" },
690 {ISCSI_IPDDRESS_STATE_ACQUIRING, "Acquiring" },
691 {ISCSI_IPDDRESS_STATE_TENTATIVE, "Tentative" },
692 {ISCSI_IPDDRESS_STATE_VALID, "Valid" },
693 {ISCSI_IPDDRESS_STATE_DISABLING, "Disabling" },
694 {ISCSI_IPDDRESS_STATE_INVALID, "Invalid" },
695 {ISCSI_IPDDRESS_STATE_DEPRECATED, "Deprecated" },
696 };
697
iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)698 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
699 {
700 int i;
701 char *state = NULL;
702
703 for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
704 if (iscsi_ipaddress_state_names[i].value == port_state) {
705 state = iscsi_ipaddress_state_names[i].name;
706 break;
707 }
708 }
709 return state;
710 }
711 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
712
713 /* convert iscsi_router_state values to ascii string name */
714 static const struct {
715 enum iscsi_router_state value;
716 char *name;
717 } iscsi_router_state_names[] = {
718 {ISCSI_ROUTER_STATE_UNKNOWN, "Unknown" },
719 {ISCSI_ROUTER_STATE_ADVERTISED, "Advertised" },
720 {ISCSI_ROUTER_STATE_MANUAL, "Manual" },
721 {ISCSI_ROUTER_STATE_STALE, "Stale" },
722 };
723
iscsi_get_router_state_name(enum iscsi_router_state router_state)724 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
725 {
726 int i;
727 char *state = NULL;
728
729 for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
730 if (iscsi_router_state_names[i].value == router_state) {
731 state = iscsi_router_state_names[i].name;
732 break;
733 }
734 }
735 return state;
736 }
737 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
738
739 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)740 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
741 uint32_t iface_type, uint32_t iface_num, int dd_size)
742 {
743 struct iscsi_iface *iface;
744 int err;
745
746 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
747 if (!iface)
748 return NULL;
749
750 iface->transport = transport;
751 iface->iface_type = iface_type;
752 iface->iface_num = iface_num;
753 iface->dev.release = iscsi_iface_release;
754 iface->dev.class = &iscsi_iface_class;
755 /* parent reference released in iscsi_iface_release */
756 iface->dev.parent = get_device(&shost->shost_gendev);
757 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
758 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
759 iface_num);
760 else
761 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
762 iface_num);
763
764 err = device_register(&iface->dev);
765 if (err)
766 goto free_iface;
767
768 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
769 if (err)
770 goto unreg_iface;
771
772 if (dd_size)
773 iface->dd_data = &iface[1];
774 return iface;
775
776 unreg_iface:
777 device_unregister(&iface->dev);
778 return NULL;
779
780 free_iface:
781 put_device(iface->dev.parent);
782 kfree(iface);
783 return NULL;
784 }
785 EXPORT_SYMBOL_GPL(iscsi_create_iface);
786
iscsi_destroy_iface(struct iscsi_iface * iface)787 void iscsi_destroy_iface(struct iscsi_iface *iface)
788 {
789 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
790 device_unregister(&iface->dev);
791 }
792 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
793
794 /*
795 * Interface to display flash node params to sysfs
796 */
797
798 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store) \
799 struct device_attribute dev_attr_##_prefix##_##_name = \
800 __ATTR(_name, _mode, _show, _store)
801
802 /* flash node session attrs show */
803 #define iscsi_flashnode_sess_attr_show(type, name, param) \
804 static ssize_t \
805 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
806 char *buf) \
807 { \
808 struct iscsi_bus_flash_session *fnode_sess = \
809 iscsi_dev_to_flash_session(dev);\
810 struct iscsi_transport *t = fnode_sess->transport; \
811 return t->get_flashnode_param(fnode_sess, param, buf); \
812 } \
813
814
815 #define iscsi_flashnode_sess_attr(type, name, param) \
816 iscsi_flashnode_sess_attr_show(type, name, param) \
817 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO, \
818 show_##type##_##name, NULL);
819
820 /* Flash node session attributes */
821
822 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
823 ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
824 iscsi_flashnode_sess_attr(fnode, discovery_session,
825 ISCSI_FLASHNODE_DISCOVERY_SESS);
826 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
827 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
828 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
829 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
830 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
831 ISCSI_FLASHNODE_DATASEQ_INORDER);
832 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
833 ISCSI_FLASHNODE_PDU_INORDER);
834 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
835 iscsi_flashnode_sess_attr(fnode, discovery_logout,
836 ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
837 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
838 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
839 ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
840 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
841 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
842 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
843 iscsi_flashnode_sess_attr(fnode, def_time2retain,
844 ISCSI_FLASHNODE_DEF_TIME2RETAIN);
845 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
846 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
847 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
848 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
849 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
850 ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
851 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
852 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
853 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
854 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
855 ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
856 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
857 ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
858 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
859 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
860 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
861 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
862 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
863 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
864 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
865
866 static struct attribute *iscsi_flashnode_sess_attrs[] = {
867 &dev_attr_fnode_auto_snd_tgt_disable.attr,
868 &dev_attr_fnode_discovery_session.attr,
869 &dev_attr_fnode_portal_type.attr,
870 &dev_attr_fnode_entry_enable.attr,
871 &dev_attr_fnode_immediate_data.attr,
872 &dev_attr_fnode_initial_r2t.attr,
873 &dev_attr_fnode_data_seq_in_order.attr,
874 &dev_attr_fnode_data_pdu_in_order.attr,
875 &dev_attr_fnode_chap_auth.attr,
876 &dev_attr_fnode_discovery_logout.attr,
877 &dev_attr_fnode_bidi_chap.attr,
878 &dev_attr_fnode_discovery_auth_optional.attr,
879 &dev_attr_fnode_erl.attr,
880 &dev_attr_fnode_first_burst_len.attr,
881 &dev_attr_fnode_def_time2wait.attr,
882 &dev_attr_fnode_def_time2retain.attr,
883 &dev_attr_fnode_max_outstanding_r2t.attr,
884 &dev_attr_fnode_isid.attr,
885 &dev_attr_fnode_tsid.attr,
886 &dev_attr_fnode_max_burst_len.attr,
887 &dev_attr_fnode_def_taskmgmt_tmo.attr,
888 &dev_attr_fnode_targetalias.attr,
889 &dev_attr_fnode_targetname.attr,
890 &dev_attr_fnode_tpgt.attr,
891 &dev_attr_fnode_discovery_parent_idx.attr,
892 &dev_attr_fnode_discovery_parent_type.attr,
893 &dev_attr_fnode_chap_in_idx.attr,
894 &dev_attr_fnode_chap_out_idx.attr,
895 &dev_attr_fnode_username.attr,
896 &dev_attr_fnode_username_in.attr,
897 &dev_attr_fnode_password.attr,
898 &dev_attr_fnode_password_in.attr,
899 &dev_attr_fnode_is_boot_target.attr,
900 NULL,
901 };
902
iscsi_flashnode_sess_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)903 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
904 struct attribute *attr,
905 int i)
906 {
907 struct device *dev = container_of(kobj, struct device, kobj);
908 struct iscsi_bus_flash_session *fnode_sess =
909 iscsi_dev_to_flash_session(dev);
910 struct iscsi_transport *t = fnode_sess->transport;
911 int param;
912
913 if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
914 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
915 } else if (attr == &dev_attr_fnode_discovery_session.attr) {
916 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
917 } else if (attr == &dev_attr_fnode_portal_type.attr) {
918 param = ISCSI_FLASHNODE_PORTAL_TYPE;
919 } else if (attr == &dev_attr_fnode_entry_enable.attr) {
920 param = ISCSI_FLASHNODE_ENTRY_EN;
921 } else if (attr == &dev_attr_fnode_immediate_data.attr) {
922 param = ISCSI_FLASHNODE_IMM_DATA_EN;
923 } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
924 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
925 } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
926 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
927 } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
928 param = ISCSI_FLASHNODE_PDU_INORDER;
929 } else if (attr == &dev_attr_fnode_chap_auth.attr) {
930 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
931 } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
932 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
933 } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
934 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
935 } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
936 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
937 } else if (attr == &dev_attr_fnode_erl.attr) {
938 param = ISCSI_FLASHNODE_ERL;
939 } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
940 param = ISCSI_FLASHNODE_FIRST_BURST;
941 } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
942 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
943 } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
944 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
945 } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
946 param = ISCSI_FLASHNODE_MAX_R2T;
947 } else if (attr == &dev_attr_fnode_isid.attr) {
948 param = ISCSI_FLASHNODE_ISID;
949 } else if (attr == &dev_attr_fnode_tsid.attr) {
950 param = ISCSI_FLASHNODE_TSID;
951 } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
952 param = ISCSI_FLASHNODE_MAX_BURST;
953 } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
954 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
955 } else if (attr == &dev_attr_fnode_targetalias.attr) {
956 param = ISCSI_FLASHNODE_ALIAS;
957 } else if (attr == &dev_attr_fnode_targetname.attr) {
958 param = ISCSI_FLASHNODE_NAME;
959 } else if (attr == &dev_attr_fnode_tpgt.attr) {
960 param = ISCSI_FLASHNODE_TPGT;
961 } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
962 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
963 } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
964 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
965 } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
966 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
967 } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
968 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
969 } else if (attr == &dev_attr_fnode_username.attr) {
970 param = ISCSI_FLASHNODE_USERNAME;
971 } else if (attr == &dev_attr_fnode_username_in.attr) {
972 param = ISCSI_FLASHNODE_USERNAME_IN;
973 } else if (attr == &dev_attr_fnode_password.attr) {
974 param = ISCSI_FLASHNODE_PASSWORD;
975 } else if (attr == &dev_attr_fnode_password_in.attr) {
976 param = ISCSI_FLASHNODE_PASSWORD_IN;
977 } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
978 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
979 } else {
980 WARN_ONCE(1, "Invalid flashnode session attr");
981 return 0;
982 }
983
984 return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
985 }
986
987 static struct attribute_group iscsi_flashnode_sess_attr_group = {
988 .attrs = iscsi_flashnode_sess_attrs,
989 .is_visible = iscsi_flashnode_sess_attr_is_visible,
990 };
991
992 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
993 &iscsi_flashnode_sess_attr_group,
994 NULL,
995 };
996
iscsi_flashnode_sess_release(struct device * dev)997 static void iscsi_flashnode_sess_release(struct device *dev)
998 {
999 struct iscsi_bus_flash_session *fnode_sess =
1000 iscsi_dev_to_flash_session(dev);
1001
1002 kfree(fnode_sess->targetname);
1003 kfree(fnode_sess->targetalias);
1004 kfree(fnode_sess->portal_type);
1005 kfree(fnode_sess);
1006 }
1007
1008 static const struct device_type iscsi_flashnode_sess_dev_type = {
1009 .name = "iscsi_flashnode_sess_dev_type",
1010 .groups = iscsi_flashnode_sess_attr_groups,
1011 .release = iscsi_flashnode_sess_release,
1012 };
1013
1014 /* flash node connection attrs show */
1015 #define iscsi_flashnode_conn_attr_show(type, name, param) \
1016 static ssize_t \
1017 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1018 char *buf) \
1019 { \
1020 struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1021 struct iscsi_bus_flash_session *fnode_sess = \
1022 iscsi_flash_conn_to_flash_session(fnode_conn);\
1023 struct iscsi_transport *t = fnode_conn->transport; \
1024 return t->get_flashnode_param(fnode_sess, param, buf); \
1025 } \
1026
1027
1028 #define iscsi_flashnode_conn_attr(type, name, param) \
1029 iscsi_flashnode_conn_attr_show(type, name, param) \
1030 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO, \
1031 show_##type##_##name, NULL);
1032
1033 /* Flash node connection attributes */
1034
1035 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1036 ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1037 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1038 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1039 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1040 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1041 ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1042 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1043 ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1044 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1045 ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1046 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1047 ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1049 ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1050 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1051 ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1052 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1053 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1054 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1055 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1056 ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1057 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1058 ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1059 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1060 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1061 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1062 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1063 ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1064 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1065 ISCSI_FLASHNODE_REDIRECT_IPADDR);
1066 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1067 ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1068 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1069 ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1070 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1071 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1072 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1073 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1074
1075 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1076 &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1077 &dev_attr_fnode_header_digest.attr,
1078 &dev_attr_fnode_data_digest.attr,
1079 &dev_attr_fnode_snack_req.attr,
1080 &dev_attr_fnode_tcp_timestamp_stat.attr,
1081 &dev_attr_fnode_tcp_nagle_disable.attr,
1082 &dev_attr_fnode_tcp_wsf_disable.attr,
1083 &dev_attr_fnode_tcp_timer_scale.attr,
1084 &dev_attr_fnode_tcp_timestamp_enable.attr,
1085 &dev_attr_fnode_fragment_disable.attr,
1086 &dev_attr_fnode_max_recv_dlength.attr,
1087 &dev_attr_fnode_max_xmit_dlength.attr,
1088 &dev_attr_fnode_keepalive_tmo.attr,
1089 &dev_attr_fnode_port.attr,
1090 &dev_attr_fnode_ipaddress.attr,
1091 &dev_attr_fnode_redirect_ipaddr.attr,
1092 &dev_attr_fnode_max_segment_size.attr,
1093 &dev_attr_fnode_local_port.attr,
1094 &dev_attr_fnode_ipv4_tos.attr,
1095 &dev_attr_fnode_ipv6_traffic_class.attr,
1096 &dev_attr_fnode_ipv6_flow_label.attr,
1097 &dev_attr_fnode_link_local_ipv6.attr,
1098 &dev_attr_fnode_tcp_xmit_wsf.attr,
1099 &dev_attr_fnode_tcp_recv_wsf.attr,
1100 &dev_attr_fnode_statsn.attr,
1101 &dev_attr_fnode_exp_statsn.attr,
1102 NULL,
1103 };
1104
iscsi_flashnode_conn_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)1105 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1106 struct attribute *attr,
1107 int i)
1108 {
1109 struct device *dev = container_of(kobj, struct device, kobj);
1110 struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1111 struct iscsi_transport *t = fnode_conn->transport;
1112 int param;
1113
1114 if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1115 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1116 } else if (attr == &dev_attr_fnode_header_digest.attr) {
1117 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1118 } else if (attr == &dev_attr_fnode_data_digest.attr) {
1119 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1120 } else if (attr == &dev_attr_fnode_snack_req.attr) {
1121 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1122 } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1123 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1124 } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1125 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1126 } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1127 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1128 } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1129 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1130 } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1131 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1132 } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1133 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1134 } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1135 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1136 } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1137 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1138 } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1139 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1140 } else if (attr == &dev_attr_fnode_port.attr) {
1141 param = ISCSI_FLASHNODE_PORT;
1142 } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1143 param = ISCSI_FLASHNODE_IPADDR;
1144 } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1145 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1146 } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1147 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1148 } else if (attr == &dev_attr_fnode_local_port.attr) {
1149 param = ISCSI_FLASHNODE_LOCAL_PORT;
1150 } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1151 param = ISCSI_FLASHNODE_IPV4_TOS;
1152 } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1153 param = ISCSI_FLASHNODE_IPV6_TC;
1154 } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1155 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1156 } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1157 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1158 } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1159 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1160 } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1161 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1162 } else if (attr == &dev_attr_fnode_statsn.attr) {
1163 param = ISCSI_FLASHNODE_STATSN;
1164 } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1165 param = ISCSI_FLASHNODE_EXP_STATSN;
1166 } else {
1167 WARN_ONCE(1, "Invalid flashnode connection attr");
1168 return 0;
1169 }
1170
1171 return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1172 }
1173
1174 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1175 .attrs = iscsi_flashnode_conn_attrs,
1176 .is_visible = iscsi_flashnode_conn_attr_is_visible,
1177 };
1178
1179 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1180 &iscsi_flashnode_conn_attr_group,
1181 NULL,
1182 };
1183
iscsi_flashnode_conn_release(struct device * dev)1184 static void iscsi_flashnode_conn_release(struct device *dev)
1185 {
1186 struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1187
1188 kfree(fnode_conn->ipaddress);
1189 kfree(fnode_conn->redirect_ipaddr);
1190 kfree(fnode_conn->link_local_ipv6_addr);
1191 kfree(fnode_conn);
1192 }
1193
1194 static const struct device_type iscsi_flashnode_conn_dev_type = {
1195 .name = "iscsi_flashnode_conn_dev_type",
1196 .groups = iscsi_flashnode_conn_attr_groups,
1197 .release = iscsi_flashnode_conn_release,
1198 };
1199
1200 static struct bus_type iscsi_flashnode_bus;
1201
iscsi_flashnode_bus_match(struct device * dev,struct device_driver * drv)1202 int iscsi_flashnode_bus_match(struct device *dev,
1203 struct device_driver *drv)
1204 {
1205 if (dev->bus == &iscsi_flashnode_bus)
1206 return 1;
1207 return 0;
1208 }
1209 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1210
1211 static struct bus_type iscsi_flashnode_bus = {
1212 .name = "iscsi_flashnode",
1213 .match = &iscsi_flashnode_bus_match,
1214 };
1215
1216 /**
1217 * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1218 * @shost: pointer to host data
1219 * @index: index of flashnode to add in sysfs
1220 * @transport: pointer to transport data
1221 * @dd_size: total size to allocate
1222 *
1223 * Adds a sysfs entry for the flashnode session attributes
1224 *
1225 * Returns:
1226 * pointer to allocated flashnode sess on success
1227 * %NULL on failure
1228 */
1229 struct iscsi_bus_flash_session *
iscsi_create_flashnode_sess(struct Scsi_Host * shost,int index,struct iscsi_transport * transport,int dd_size)1230 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1231 struct iscsi_transport *transport,
1232 int dd_size)
1233 {
1234 struct iscsi_bus_flash_session *fnode_sess;
1235 int err;
1236
1237 fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1238 if (!fnode_sess)
1239 return NULL;
1240
1241 fnode_sess->transport = transport;
1242 fnode_sess->target_id = index;
1243 fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1244 fnode_sess->dev.bus = &iscsi_flashnode_bus;
1245 fnode_sess->dev.parent = &shost->shost_gendev;
1246 dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1247 shost->host_no, index);
1248
1249 err = device_register(&fnode_sess->dev);
1250 if (err)
1251 goto free_fnode_sess;
1252
1253 if (dd_size)
1254 fnode_sess->dd_data = &fnode_sess[1];
1255
1256 return fnode_sess;
1257
1258 free_fnode_sess:
1259 kfree(fnode_sess);
1260 return NULL;
1261 }
1262 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1263
1264 /**
1265 * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1266 * @shost: pointer to host data
1267 * @fnode_sess: pointer to the parent flashnode session entry
1268 * @transport: pointer to transport data
1269 * @dd_size: total size to allocate
1270 *
1271 * Adds a sysfs entry for the flashnode connection attributes
1272 *
1273 * Returns:
1274 * pointer to allocated flashnode conn on success
1275 * %NULL on failure
1276 */
1277 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)1278 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1279 struct iscsi_bus_flash_session *fnode_sess,
1280 struct iscsi_transport *transport,
1281 int dd_size)
1282 {
1283 struct iscsi_bus_flash_conn *fnode_conn;
1284 int err;
1285
1286 fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1287 if (!fnode_conn)
1288 return NULL;
1289
1290 fnode_conn->transport = transport;
1291 fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1292 fnode_conn->dev.bus = &iscsi_flashnode_bus;
1293 fnode_conn->dev.parent = &fnode_sess->dev;
1294 dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1295 shost->host_no, fnode_sess->target_id);
1296
1297 err = device_register(&fnode_conn->dev);
1298 if (err)
1299 goto free_fnode_conn;
1300
1301 if (dd_size)
1302 fnode_conn->dd_data = &fnode_conn[1];
1303
1304 return fnode_conn;
1305
1306 free_fnode_conn:
1307 kfree(fnode_conn);
1308 return NULL;
1309 }
1310 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1311
1312 /**
1313 * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1314 * @dev: device to verify
1315 * @data: pointer to data containing value to use for verification
1316 *
1317 * Verifies if the passed device is flashnode conn device
1318 *
1319 * Returns:
1320 * 1 on success
1321 * 0 on failure
1322 */
iscsi_is_flashnode_conn_dev(struct device * dev,void * data)1323 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1324 {
1325 return dev->bus == &iscsi_flashnode_bus;
1326 }
1327
iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn * fnode_conn)1328 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1329 {
1330 device_unregister(&fnode_conn->dev);
1331 return 0;
1332 }
1333
flashnode_match_index(struct device * dev,void * data)1334 static int flashnode_match_index(struct device *dev, void *data)
1335 {
1336 struct iscsi_bus_flash_session *fnode_sess = NULL;
1337 int ret = 0;
1338
1339 if (!iscsi_flashnode_bus_match(dev, NULL))
1340 goto exit_match_index;
1341
1342 fnode_sess = iscsi_dev_to_flash_session(dev);
1343 ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1344
1345 exit_match_index:
1346 return ret;
1347 }
1348
1349 /**
1350 * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1351 * @shost: pointer to host data
1352 * @idx: index to match
1353 *
1354 * Finds the flashnode session object for the passed index
1355 *
1356 * Returns:
1357 * pointer to found flashnode session object on success
1358 * %NULL on failure
1359 */
1360 static struct iscsi_bus_flash_session *
iscsi_get_flashnode_by_index(struct Scsi_Host * shost,uint32_t idx)1361 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1362 {
1363 struct iscsi_bus_flash_session *fnode_sess = NULL;
1364 struct device *dev;
1365
1366 dev = device_find_child(&shost->shost_gendev, &idx,
1367 flashnode_match_index);
1368 if (dev)
1369 fnode_sess = iscsi_dev_to_flash_session(dev);
1370
1371 return fnode_sess;
1372 }
1373
1374 /**
1375 * iscsi_find_flashnode_sess - finds flashnode session entry
1376 * @shost: pointer to host data
1377 * @data: pointer to data containing value to use for comparison
1378 * @fn: function pointer that does actual comparison
1379 *
1380 * Finds the flashnode session object comparing the data passed using logic
1381 * defined in passed function pointer
1382 *
1383 * Returns:
1384 * pointer to found flashnode session device object on success
1385 * %NULL on failure
1386 */
1387 struct device *
iscsi_find_flashnode_sess(struct Scsi_Host * shost,void * data,int (* fn)(struct device * dev,void * data))1388 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1389 int (*fn)(struct device *dev, void *data))
1390 {
1391 return device_find_child(&shost->shost_gendev, data, fn);
1392 }
1393 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1394
1395 /**
1396 * iscsi_find_flashnode_conn - finds flashnode connection entry
1397 * @fnode_sess: pointer to parent flashnode session entry
1398 *
1399 * Finds the flashnode connection object comparing the data passed using logic
1400 * defined in passed function pointer
1401 *
1402 * Returns:
1403 * pointer to found flashnode connection device object on success
1404 * %NULL on failure
1405 */
1406 struct device *
iscsi_find_flashnode_conn(struct iscsi_bus_flash_session * fnode_sess)1407 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1408 {
1409 return device_find_child(&fnode_sess->dev, NULL,
1410 iscsi_is_flashnode_conn_dev);
1411 }
1412 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1413
iscsi_iter_destroy_flashnode_conn_fn(struct device * dev,void * data)1414 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1415 {
1416 if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1417 return 0;
1418
1419 return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1420 }
1421
1422 /**
1423 * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1424 * @fnode_sess: pointer to flashnode session entry to be destroyed
1425 *
1426 * Deletes the flashnode session entry and all children flashnode connection
1427 * entries from sysfs
1428 */
iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session * fnode_sess)1429 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1430 {
1431 int err;
1432
1433 err = device_for_each_child(&fnode_sess->dev, NULL,
1434 iscsi_iter_destroy_flashnode_conn_fn);
1435 if (err)
1436 pr_err("Could not delete all connections for %s. Error %d.\n",
1437 fnode_sess->dev.kobj.name, err);
1438
1439 device_unregister(&fnode_sess->dev);
1440 }
1441 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1442
iscsi_iter_destroy_flashnode_fn(struct device * dev,void * data)1443 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1444 {
1445 if (!iscsi_flashnode_bus_match(dev, NULL))
1446 return 0;
1447
1448 iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1449 return 0;
1450 }
1451
1452 /**
1453 * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1454 * @shost: pointer to host data
1455 *
1456 * Destroys all the flashnode session entries and all corresponding children
1457 * flashnode connection entries from sysfs
1458 */
iscsi_destroy_all_flashnode(struct Scsi_Host * shost)1459 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1460 {
1461 device_for_each_child(&shost->shost_gendev, NULL,
1462 iscsi_iter_destroy_flashnode_fn);
1463 }
1464 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1465
1466 /*
1467 * BSG support
1468 */
1469 /**
1470 * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1471 * @job: bsg job to be processed
1472 */
iscsi_bsg_host_dispatch(struct bsg_job * job)1473 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1474 {
1475 struct Scsi_Host *shost = iscsi_job_to_shost(job);
1476 struct iscsi_bsg_request *req = job->request;
1477 struct iscsi_bsg_reply *reply = job->reply;
1478 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1479 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
1480 int ret;
1481
1482 /* check if we have the msgcode value at least */
1483 if (job->request_len < sizeof(uint32_t)) {
1484 ret = -ENOMSG;
1485 goto fail_host_msg;
1486 }
1487
1488 /* Validate the host command */
1489 switch (req->msgcode) {
1490 case ISCSI_BSG_HST_VENDOR:
1491 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1492 if ((shost->hostt->vendor_id == 0L) ||
1493 (req->rqst_data.h_vendor.vendor_id !=
1494 shost->hostt->vendor_id)) {
1495 ret = -ESRCH;
1496 goto fail_host_msg;
1497 }
1498 break;
1499 default:
1500 ret = -EBADR;
1501 goto fail_host_msg;
1502 }
1503
1504 /* check if we really have all the request data needed */
1505 if (job->request_len < cmdlen) {
1506 ret = -ENOMSG;
1507 goto fail_host_msg;
1508 }
1509
1510 ret = i->iscsi_transport->bsg_request(job);
1511 if (!ret)
1512 return 0;
1513
1514 fail_host_msg:
1515 /* return the errno failure code as the only status */
1516 BUG_ON(job->reply_len < sizeof(uint32_t));
1517 reply->reply_payload_rcv_len = 0;
1518 reply->result = ret;
1519 job->reply_len = sizeof(uint32_t);
1520 bsg_job_done(job, ret, 0);
1521 return 0;
1522 }
1523
1524 /**
1525 * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1526 * @shost: shost for iscsi_host
1527 * @ihost: iscsi_cls_host adding the structures to
1528 */
1529 static int
iscsi_bsg_host_add(struct Scsi_Host * shost,struct iscsi_cls_host * ihost)1530 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1531 {
1532 struct device *dev = &shost->shost_gendev;
1533 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1534 struct request_queue *q;
1535 char bsg_name[20];
1536
1537 if (!i->iscsi_transport->bsg_request)
1538 return -ENOTSUPP;
1539
1540 snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1541 q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1542 if (IS_ERR(q)) {
1543 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1544 "initialize - no request queue\n");
1545 return PTR_ERR(q);
1546 }
1547 __scsi_init_queue(shost, q);
1548
1549 ihost->bsg_q = q;
1550 return 0;
1551 }
1552
iscsi_setup_host(struct transport_container * tc,struct device * dev,struct device * cdev)1553 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1554 struct device *cdev)
1555 {
1556 struct Scsi_Host *shost = dev_to_shost(dev);
1557 struct iscsi_cls_host *ihost = shost->shost_data;
1558
1559 memset(ihost, 0, sizeof(*ihost));
1560 atomic_set(&ihost->nr_scans, 0);
1561 mutex_init(&ihost->mutex);
1562
1563 iscsi_bsg_host_add(shost, ihost);
1564 /* ignore any bsg add error - we just can't do sgio */
1565
1566 return 0;
1567 }
1568
iscsi_remove_host(struct transport_container * tc,struct device * dev,struct device * cdev)1569 static int iscsi_remove_host(struct transport_container *tc,
1570 struct device *dev, struct device *cdev)
1571 {
1572 struct Scsi_Host *shost = dev_to_shost(dev);
1573 struct iscsi_cls_host *ihost = shost->shost_data;
1574
1575 bsg_remove_queue(ihost->bsg_q);
1576 return 0;
1577 }
1578
1579 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1580 "iscsi_host",
1581 iscsi_setup_host,
1582 iscsi_remove_host,
1583 NULL);
1584
1585 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1586 "iscsi_session",
1587 NULL,
1588 NULL,
1589 NULL);
1590
1591 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1592 "iscsi_connection",
1593 NULL,
1594 NULL,
1595 NULL);
1596
1597 static struct sock *nls;
1598 static DEFINE_MUTEX(rx_queue_mutex);
1599
1600 static LIST_HEAD(sesslist);
1601 static DEFINE_SPINLOCK(sesslock);
1602 static LIST_HEAD(connlist);
1603 static LIST_HEAD(connlist_err);
1604 static DEFINE_SPINLOCK(connlock);
1605
iscsi_conn_get_sid(struct iscsi_cls_conn * conn)1606 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1607 {
1608 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1609 return sess->sid;
1610 }
1611
1612 /*
1613 * Returns the matching session to a given sid
1614 */
iscsi_session_lookup(uint32_t sid)1615 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1616 {
1617 unsigned long flags;
1618 struct iscsi_cls_session *sess;
1619
1620 spin_lock_irqsave(&sesslock, flags);
1621 list_for_each_entry(sess, &sesslist, sess_list) {
1622 if (sess->sid == sid) {
1623 spin_unlock_irqrestore(&sesslock, flags);
1624 return sess;
1625 }
1626 }
1627 spin_unlock_irqrestore(&sesslock, flags);
1628 return NULL;
1629 }
1630
1631 /*
1632 * Returns the matching connection to a given sid / cid tuple
1633 */
iscsi_conn_lookup(uint32_t sid,uint32_t cid)1634 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1635 {
1636 unsigned long flags;
1637 struct iscsi_cls_conn *conn;
1638
1639 spin_lock_irqsave(&connlock, flags);
1640 list_for_each_entry(conn, &connlist, conn_list) {
1641 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1642 spin_unlock_irqrestore(&connlock, flags);
1643 return conn;
1644 }
1645 }
1646 spin_unlock_irqrestore(&connlock, flags);
1647 return NULL;
1648 }
1649
1650 /*
1651 * The following functions can be used by LLDs that allocate
1652 * their own scsi_hosts or by software iscsi LLDs
1653 */
1654 static struct {
1655 int value;
1656 char *name;
1657 } iscsi_session_state_names[] = {
1658 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
1659 { ISCSI_SESSION_FAILED, "FAILED" },
1660 { ISCSI_SESSION_FREE, "FREE" },
1661 };
1662
iscsi_session_state_name(int state)1663 static const char *iscsi_session_state_name(int state)
1664 {
1665 int i;
1666 char *name = NULL;
1667
1668 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1669 if (iscsi_session_state_names[i].value == state) {
1670 name = iscsi_session_state_names[i].name;
1671 break;
1672 }
1673 }
1674 return name;
1675 }
1676
1677 static char *iscsi_session_target_state_name[] = {
1678 [ISCSI_SESSION_TARGET_UNBOUND] = "UNBOUND",
1679 [ISCSI_SESSION_TARGET_ALLOCATED] = "ALLOCATED",
1680 [ISCSI_SESSION_TARGET_SCANNED] = "SCANNED",
1681 [ISCSI_SESSION_TARGET_UNBINDING] = "UNBINDING",
1682 };
1683
iscsi_session_chkready(struct iscsi_cls_session * session)1684 int iscsi_session_chkready(struct iscsi_cls_session *session)
1685 {
1686 unsigned long flags;
1687 int err;
1688
1689 spin_lock_irqsave(&session->lock, flags);
1690 switch (session->state) {
1691 case ISCSI_SESSION_LOGGED_IN:
1692 err = 0;
1693 break;
1694 case ISCSI_SESSION_FAILED:
1695 err = DID_IMM_RETRY << 16;
1696 break;
1697 case ISCSI_SESSION_FREE:
1698 err = DID_TRANSPORT_FAILFAST << 16;
1699 break;
1700 default:
1701 err = DID_NO_CONNECT << 16;
1702 break;
1703 }
1704 spin_unlock_irqrestore(&session->lock, flags);
1705 return err;
1706 }
1707 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1708
iscsi_is_session_online(struct iscsi_cls_session * session)1709 int iscsi_is_session_online(struct iscsi_cls_session *session)
1710 {
1711 unsigned long flags;
1712 int ret = 0;
1713
1714 spin_lock_irqsave(&session->lock, flags);
1715 if (session->state == ISCSI_SESSION_LOGGED_IN)
1716 ret = 1;
1717 spin_unlock_irqrestore(&session->lock, flags);
1718 return ret;
1719 }
1720 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1721
iscsi_session_release(struct device * dev)1722 static void iscsi_session_release(struct device *dev)
1723 {
1724 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1725 struct Scsi_Host *shost;
1726
1727 shost = iscsi_session_to_shost(session);
1728 scsi_host_put(shost);
1729 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1730 kfree(session);
1731 }
1732
iscsi_is_session_dev(const struct device * dev)1733 int iscsi_is_session_dev(const struct device *dev)
1734 {
1735 return dev->release == iscsi_session_release;
1736 }
1737 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1738
iscsi_iter_session_fn(struct device * dev,void * data)1739 static int iscsi_iter_session_fn(struct device *dev, void *data)
1740 {
1741 void (* fn) (struct iscsi_cls_session *) = data;
1742
1743 if (!iscsi_is_session_dev(dev))
1744 return 0;
1745 fn(iscsi_dev_to_session(dev));
1746 return 0;
1747 }
1748
iscsi_host_for_each_session(struct Scsi_Host * shost,void (* fn)(struct iscsi_cls_session *))1749 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1750 void (*fn)(struct iscsi_cls_session *))
1751 {
1752 device_for_each_child(&shost->shost_gendev, fn,
1753 iscsi_iter_session_fn);
1754 }
1755 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1756
1757 /**
1758 * iscsi_scan_finished - helper to report when running scans are done
1759 * @shost: scsi host
1760 * @time: scan run time
1761 *
1762 * This function can be used by drives like qla4xxx to report to the scsi
1763 * layer when the scans it kicked off at module load time are done.
1764 */
iscsi_scan_finished(struct Scsi_Host * shost,unsigned long time)1765 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1766 {
1767 struct iscsi_cls_host *ihost = shost->shost_data;
1768 /*
1769 * qla4xxx will have kicked off some session unblocks before calling
1770 * scsi_scan_host, so just wait for them to complete.
1771 */
1772 return !atomic_read(&ihost->nr_scans);
1773 }
1774 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1775
1776 struct iscsi_scan_data {
1777 unsigned int channel;
1778 unsigned int id;
1779 u64 lun;
1780 enum scsi_scan_mode rescan;
1781 };
1782
iscsi_user_scan_session(struct device * dev,void * data)1783 static int iscsi_user_scan_session(struct device *dev, void *data)
1784 {
1785 struct iscsi_scan_data *scan_data = data;
1786 struct iscsi_cls_session *session;
1787 struct Scsi_Host *shost;
1788 struct iscsi_cls_host *ihost;
1789 unsigned long flags;
1790 unsigned int id;
1791
1792 if (!iscsi_is_session_dev(dev))
1793 return 0;
1794
1795 session = iscsi_dev_to_session(dev);
1796
1797 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1798
1799 shost = iscsi_session_to_shost(session);
1800 ihost = shost->shost_data;
1801
1802 mutex_lock(&ihost->mutex);
1803 spin_lock_irqsave(&session->lock, flags);
1804 if (session->state != ISCSI_SESSION_LOGGED_IN) {
1805 spin_unlock_irqrestore(&session->lock, flags);
1806 goto user_scan_exit;
1807 }
1808 id = session->target_id;
1809 spin_unlock_irqrestore(&session->lock, flags);
1810
1811 if (id != ISCSI_MAX_TARGET) {
1812 if ((scan_data->channel == SCAN_WILD_CARD ||
1813 scan_data->channel == 0) &&
1814 (scan_data->id == SCAN_WILD_CARD ||
1815 scan_data->id == id)) {
1816 scsi_scan_target(&session->dev, 0, id,
1817 scan_data->lun, scan_data->rescan);
1818 spin_lock_irqsave(&session->lock, flags);
1819 session->target_state = ISCSI_SESSION_TARGET_SCANNED;
1820 spin_unlock_irqrestore(&session->lock, flags);
1821 }
1822 }
1823
1824 user_scan_exit:
1825 mutex_unlock(&ihost->mutex);
1826 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1827 return 0;
1828 }
1829
iscsi_user_scan(struct Scsi_Host * shost,uint channel,uint id,u64 lun)1830 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1831 uint id, u64 lun)
1832 {
1833 struct iscsi_scan_data scan_data;
1834
1835 scan_data.channel = channel;
1836 scan_data.id = id;
1837 scan_data.lun = lun;
1838 scan_data.rescan = SCSI_SCAN_MANUAL;
1839
1840 return device_for_each_child(&shost->shost_gendev, &scan_data,
1841 iscsi_user_scan_session);
1842 }
1843
iscsi_scan_session(struct work_struct * work)1844 static void iscsi_scan_session(struct work_struct *work)
1845 {
1846 struct iscsi_cls_session *session =
1847 container_of(work, struct iscsi_cls_session, scan_work);
1848 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1849 struct iscsi_cls_host *ihost = shost->shost_data;
1850 struct iscsi_scan_data scan_data;
1851
1852 scan_data.channel = 0;
1853 scan_data.id = SCAN_WILD_CARD;
1854 scan_data.lun = SCAN_WILD_CARD;
1855 scan_data.rescan = SCSI_SCAN_RESCAN;
1856
1857 iscsi_user_scan_session(&session->dev, &scan_data);
1858 atomic_dec(&ihost->nr_scans);
1859 }
1860
1861 /**
1862 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1863 * @cmd: scsi cmd passed to scsi eh handler
1864 *
1865 * If the session is down this function will wait for the recovery
1866 * timer to fire or for the session to be logged back in. If the
1867 * recovery timer fires then FAST_IO_FAIL is returned. The caller
1868 * should pass this error value to the scsi eh.
1869 */
iscsi_block_scsi_eh(struct scsi_cmnd * cmd)1870 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1871 {
1872 struct iscsi_cls_session *session =
1873 starget_to_session(scsi_target(cmd->device));
1874 unsigned long flags;
1875 int ret = 0;
1876
1877 spin_lock_irqsave(&session->lock, flags);
1878 while (session->state != ISCSI_SESSION_LOGGED_IN) {
1879 if (session->state == ISCSI_SESSION_FREE) {
1880 ret = FAST_IO_FAIL;
1881 break;
1882 }
1883 spin_unlock_irqrestore(&session->lock, flags);
1884 msleep(1000);
1885 spin_lock_irqsave(&session->lock, flags);
1886 }
1887 spin_unlock_irqrestore(&session->lock, flags);
1888 return ret;
1889 }
1890 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1891
session_recovery_timedout(struct work_struct * work)1892 static void session_recovery_timedout(struct work_struct *work)
1893 {
1894 struct iscsi_cls_session *session =
1895 container_of(work, struct iscsi_cls_session,
1896 recovery_work.work);
1897 unsigned long flags;
1898
1899 iscsi_cls_session_printk(KERN_INFO, session,
1900 "session recovery timed out after %d secs\n",
1901 session->recovery_tmo);
1902
1903 spin_lock_irqsave(&session->lock, flags);
1904 switch (session->state) {
1905 case ISCSI_SESSION_FAILED:
1906 session->state = ISCSI_SESSION_FREE;
1907 break;
1908 case ISCSI_SESSION_LOGGED_IN:
1909 case ISCSI_SESSION_FREE:
1910 /* we raced with the unblock's flush */
1911 spin_unlock_irqrestore(&session->lock, flags);
1912 return;
1913 }
1914 spin_unlock_irqrestore(&session->lock, flags);
1915
1916 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1917 scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1918 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1919
1920 if (session->transport->session_recovery_timedout)
1921 session->transport->session_recovery_timedout(session);
1922 }
1923
__iscsi_unblock_session(struct work_struct * work)1924 static void __iscsi_unblock_session(struct work_struct *work)
1925 {
1926 struct iscsi_cls_session *session =
1927 container_of(work, struct iscsi_cls_session,
1928 unblock_work);
1929 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1930 struct iscsi_cls_host *ihost = shost->shost_data;
1931 unsigned long flags;
1932
1933 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1934 /*
1935 * The recovery and unblock work get run from the same workqueue,
1936 * so try to cancel it if it was going to run after this unblock.
1937 */
1938 cancel_delayed_work(&session->recovery_work);
1939 spin_lock_irqsave(&session->lock, flags);
1940 session->state = ISCSI_SESSION_LOGGED_IN;
1941 spin_unlock_irqrestore(&session->lock, flags);
1942 /* start IO */
1943 scsi_target_unblock(&session->dev, SDEV_RUNNING);
1944 /*
1945 * Only do kernel scanning if the driver is properly hooked into
1946 * the async scanning code (drivers like iscsi_tcp do login and
1947 * scanning from userspace).
1948 */
1949 if (shost->hostt->scan_finished) {
1950 if (scsi_queue_work(shost, &session->scan_work))
1951 atomic_inc(&ihost->nr_scans);
1952 }
1953 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1954 }
1955
1956 /**
1957 * iscsi_unblock_session - set a session as logged in and start IO.
1958 * @session: iscsi session
1959 *
1960 * Mark a session as ready to accept IO.
1961 */
iscsi_unblock_session(struct iscsi_cls_session * session)1962 void iscsi_unblock_session(struct iscsi_cls_session *session)
1963 {
1964 flush_work(&session->block_work);
1965
1966 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1967 /*
1968 * Blocking the session can be done from any context so we only
1969 * queue the block work. Make sure the unblock work has completed
1970 * because it flushes/cancels the other works and updates the state.
1971 */
1972 flush_work(&session->unblock_work);
1973 }
1974 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1975
__iscsi_block_session(struct work_struct * work)1976 static void __iscsi_block_session(struct work_struct *work)
1977 {
1978 struct iscsi_cls_session *session =
1979 container_of(work, struct iscsi_cls_session,
1980 block_work);
1981 unsigned long flags;
1982
1983 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1984 spin_lock_irqsave(&session->lock, flags);
1985 session->state = ISCSI_SESSION_FAILED;
1986 spin_unlock_irqrestore(&session->lock, flags);
1987 scsi_target_block(&session->dev);
1988 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1989 if (session->recovery_tmo >= 0)
1990 queue_delayed_work(iscsi_eh_timer_workq,
1991 &session->recovery_work,
1992 session->recovery_tmo * HZ);
1993 }
1994
iscsi_block_session(struct iscsi_cls_session * session)1995 void iscsi_block_session(struct iscsi_cls_session *session)
1996 {
1997 queue_work(iscsi_eh_timer_workq, &session->block_work);
1998 }
1999 EXPORT_SYMBOL_GPL(iscsi_block_session);
2000
__iscsi_unbind_session(struct work_struct * work)2001 static void __iscsi_unbind_session(struct work_struct *work)
2002 {
2003 struct iscsi_cls_session *session =
2004 container_of(work, struct iscsi_cls_session,
2005 unbind_work);
2006 struct Scsi_Host *shost = iscsi_session_to_shost(session);
2007 struct iscsi_cls_host *ihost = shost->shost_data;
2008 unsigned long flags;
2009 unsigned int target_id;
2010 bool remove_target = true;
2011
2012 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2013
2014 /* Prevent new scans and make sure scanning is not in progress */
2015 mutex_lock(&ihost->mutex);
2016 spin_lock_irqsave(&session->lock, flags);
2017 if (session->target_state == ISCSI_SESSION_TARGET_ALLOCATED) {
2018 remove_target = false;
2019 } else if (session->target_state != ISCSI_SESSION_TARGET_SCANNED) {
2020 spin_unlock_irqrestore(&session->lock, flags);
2021 mutex_unlock(&ihost->mutex);
2022 ISCSI_DBG_TRANS_SESSION(session,
2023 "Skipping target unbinding: Session is unbound/unbinding.\n");
2024 return;
2025 }
2026
2027 session->target_state = ISCSI_SESSION_TARGET_UNBINDING;
2028 target_id = session->target_id;
2029 session->target_id = ISCSI_MAX_TARGET;
2030 spin_unlock_irqrestore(&session->lock, flags);
2031 mutex_unlock(&ihost->mutex);
2032
2033 if (remove_target)
2034 scsi_remove_target(&session->dev);
2035
2036 if (session->ida_used)
2037 ida_simple_remove(&iscsi_sess_ida, target_id);
2038
2039 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2040 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2041
2042 spin_lock_irqsave(&session->lock, flags);
2043 session->target_state = ISCSI_SESSION_TARGET_UNBOUND;
2044 spin_unlock_irqrestore(&session->lock, flags);
2045 }
2046
__iscsi_destroy_session(struct work_struct * work)2047 static void __iscsi_destroy_session(struct work_struct *work)
2048 {
2049 struct iscsi_cls_session *session =
2050 container_of(work, struct iscsi_cls_session, destroy_work);
2051
2052 session->transport->destroy_session(session);
2053 }
2054
2055 struct iscsi_cls_session *
iscsi_alloc_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size)2056 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2057 int dd_size)
2058 {
2059 struct iscsi_cls_session *session;
2060
2061 session = kzalloc(sizeof(*session) + dd_size,
2062 GFP_KERNEL);
2063 if (!session)
2064 return NULL;
2065
2066 session->transport = transport;
2067 session->creator = -1;
2068 session->recovery_tmo = 120;
2069 session->recovery_tmo_sysfs_override = false;
2070 session->state = ISCSI_SESSION_FREE;
2071 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2072 INIT_LIST_HEAD(&session->sess_list);
2073 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2074 INIT_WORK(&session->block_work, __iscsi_block_session);
2075 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2076 INIT_WORK(&session->scan_work, iscsi_scan_session);
2077 INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2078 spin_lock_init(&session->lock);
2079
2080 /* this is released in the dev's release function */
2081 scsi_host_get(shost);
2082 session->dev.parent = &shost->shost_gendev;
2083 session->dev.release = iscsi_session_release;
2084 device_initialize(&session->dev);
2085 if (dd_size)
2086 session->dd_data = &session[1];
2087
2088 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2089 return session;
2090 }
2091 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2092
iscsi_add_session(struct iscsi_cls_session * session,unsigned int target_id)2093 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2094 {
2095 unsigned long flags;
2096 int id = 0;
2097 int err;
2098
2099 session->sid = atomic_add_return(1, &iscsi_session_nr);
2100
2101 if (target_id == ISCSI_MAX_TARGET) {
2102 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2103
2104 if (id < 0) {
2105 iscsi_cls_session_printk(KERN_ERR, session,
2106 "Failure in Target ID Allocation\n");
2107 return id;
2108 }
2109 session->target_id = (unsigned int)id;
2110 session->ida_used = true;
2111 } else
2112 session->target_id = target_id;
2113 spin_lock_irqsave(&session->lock, flags);
2114 session->target_state = ISCSI_SESSION_TARGET_ALLOCATED;
2115 spin_unlock_irqrestore(&session->lock, flags);
2116
2117 dev_set_name(&session->dev, "session%u", session->sid);
2118 err = device_add(&session->dev);
2119 if (err) {
2120 iscsi_cls_session_printk(KERN_ERR, session,
2121 "could not register session's dev\n");
2122 goto release_ida;
2123 }
2124 err = transport_register_device(&session->dev);
2125 if (err) {
2126 iscsi_cls_session_printk(KERN_ERR, session,
2127 "could not register transport's dev\n");
2128 goto release_dev;
2129 }
2130
2131 spin_lock_irqsave(&sesslock, flags);
2132 list_add(&session->sess_list, &sesslist);
2133 spin_unlock_irqrestore(&sesslock, flags);
2134
2135 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2136 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2137 return 0;
2138
2139 release_dev:
2140 device_del(&session->dev);
2141 release_ida:
2142 if (session->ida_used)
2143 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2144
2145 return err;
2146 }
2147 EXPORT_SYMBOL_GPL(iscsi_add_session);
2148
2149 /**
2150 * iscsi_create_session - create iscsi class session
2151 * @shost: scsi host
2152 * @transport: iscsi transport
2153 * @dd_size: private driver data size
2154 * @target_id: which target
2155 *
2156 * This can be called from a LLD or iscsi_transport.
2157 */
2158 struct iscsi_cls_session *
iscsi_create_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size,unsigned int target_id)2159 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2160 int dd_size, unsigned int target_id)
2161 {
2162 struct iscsi_cls_session *session;
2163
2164 session = iscsi_alloc_session(shost, transport, dd_size);
2165 if (!session)
2166 return NULL;
2167
2168 if (iscsi_add_session(session, target_id)) {
2169 iscsi_free_session(session);
2170 return NULL;
2171 }
2172 return session;
2173 }
2174 EXPORT_SYMBOL_GPL(iscsi_create_session);
2175
iscsi_conn_release(struct device * dev)2176 static void iscsi_conn_release(struct device *dev)
2177 {
2178 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2179 struct device *parent = conn->dev.parent;
2180
2181 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2182 kfree(conn);
2183 put_device(parent);
2184 }
2185
iscsi_is_conn_dev(const struct device * dev)2186 static int iscsi_is_conn_dev(const struct device *dev)
2187 {
2188 return dev->release == iscsi_conn_release;
2189 }
2190
iscsi_iter_destroy_conn_fn(struct device * dev,void * data)2191 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2192 {
2193 if (!iscsi_is_conn_dev(dev))
2194 return 0;
2195 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2196 }
2197
iscsi_remove_session(struct iscsi_cls_session * session)2198 void iscsi_remove_session(struct iscsi_cls_session *session)
2199 {
2200 unsigned long flags;
2201 int err;
2202
2203 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2204
2205 spin_lock_irqsave(&sesslock, flags);
2206 if (!list_empty(&session->sess_list))
2207 list_del(&session->sess_list);
2208 spin_unlock_irqrestore(&sesslock, flags);
2209
2210 flush_work(&session->block_work);
2211 flush_work(&session->unblock_work);
2212 cancel_delayed_work_sync(&session->recovery_work);
2213 /*
2214 * If we are blocked let commands flow again. The lld or iscsi
2215 * layer should set up the queuecommand to fail commands.
2216 * We assume that LLD will not be calling block/unblock while
2217 * removing the session.
2218 */
2219 spin_lock_irqsave(&session->lock, flags);
2220 session->state = ISCSI_SESSION_FREE;
2221 spin_unlock_irqrestore(&session->lock, flags);
2222
2223 scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2224 /* flush running scans then delete devices */
2225 flush_work(&session->scan_work);
2226 /* flush running unbind operations */
2227 flush_work(&session->unbind_work);
2228 __iscsi_unbind_session(&session->unbind_work);
2229
2230 /* hw iscsi may not have removed all connections from session */
2231 err = device_for_each_child(&session->dev, NULL,
2232 iscsi_iter_destroy_conn_fn);
2233 if (err)
2234 iscsi_cls_session_printk(KERN_ERR, session,
2235 "Could not delete all connections "
2236 "for session. Error %d.\n", err);
2237
2238 transport_unregister_device(&session->dev);
2239
2240 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2241 device_del(&session->dev);
2242 }
2243 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2244
iscsi_stop_conn(struct iscsi_cls_conn * conn,int flag)2245 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2246 {
2247 ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2248
2249 switch (flag) {
2250 case STOP_CONN_RECOVER:
2251 WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2252 break;
2253 case STOP_CONN_TERM:
2254 WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2255 break;
2256 default:
2257 iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2258 flag);
2259 return;
2260 }
2261
2262 conn->transport->stop_conn(conn, flag);
2263 ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2264 }
2265
iscsi_ep_disconnect(struct iscsi_cls_conn * conn,bool is_active)2266 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2267 {
2268 struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2269 struct iscsi_endpoint *ep;
2270
2271 ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2272 WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2273
2274 if (!conn->ep || !session->transport->ep_disconnect)
2275 return;
2276
2277 ep = conn->ep;
2278 conn->ep = NULL;
2279
2280 session->transport->unbind_conn(conn, is_active);
2281 session->transport->ep_disconnect(ep);
2282 ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2283 }
2284
iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn * conn,struct iscsi_endpoint * ep,bool is_active)2285 static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2286 struct iscsi_endpoint *ep,
2287 bool is_active)
2288 {
2289 /* Check if this was a conn error and the kernel took ownership */
2290 spin_lock_irq(&conn->lock);
2291 if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2292 spin_unlock_irq(&conn->lock);
2293 iscsi_ep_disconnect(conn, is_active);
2294 } else {
2295 spin_unlock_irq(&conn->lock);
2296 ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2297 mutex_unlock(&conn->ep_mutex);
2298
2299 flush_work(&conn->cleanup_work);
2300 /*
2301 * Userspace is now done with the EP so we can release the ref
2302 * iscsi_cleanup_conn_work_fn took.
2303 */
2304 iscsi_put_endpoint(ep);
2305 mutex_lock(&conn->ep_mutex);
2306 }
2307 }
2308
iscsi_if_stop_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)2309 static int iscsi_if_stop_conn(struct iscsi_transport *transport,
2310 struct iscsi_uevent *ev)
2311 {
2312 int flag = ev->u.stop_conn.flag;
2313 struct iscsi_cls_conn *conn;
2314
2315 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2316 if (!conn)
2317 return -EINVAL;
2318
2319 ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2320 /*
2321 * If this is a termination we have to call stop_conn with that flag
2322 * so the correct states get set. If we haven't run the work yet try to
2323 * avoid the extra run.
2324 */
2325 if (flag == STOP_CONN_TERM) {
2326 cancel_work_sync(&conn->cleanup_work);
2327 iscsi_stop_conn(conn, flag);
2328 } else {
2329 /*
2330 * For offload, when iscsid is restarted it won't know about
2331 * existing endpoints so it can't do a ep_disconnect. We clean
2332 * it up here for userspace.
2333 */
2334 mutex_lock(&conn->ep_mutex);
2335 if (conn->ep)
2336 iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
2337 mutex_unlock(&conn->ep_mutex);
2338
2339 /*
2340 * Figure out if it was the kernel or userspace initiating this.
2341 */
2342 spin_lock_irq(&conn->lock);
2343 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2344 spin_unlock_irq(&conn->lock);
2345 iscsi_stop_conn(conn, flag);
2346 } else {
2347 spin_unlock_irq(&conn->lock);
2348 ISCSI_DBG_TRANS_CONN(conn,
2349 "flush kernel conn cleanup.\n");
2350 flush_work(&conn->cleanup_work);
2351 }
2352 /*
2353 * Only clear for recovery to avoid extra cleanup runs during
2354 * termination.
2355 */
2356 spin_lock_irq(&conn->lock);
2357 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2358 spin_unlock_irq(&conn->lock);
2359 }
2360 ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2361 return 0;
2362 }
2363
iscsi_cleanup_conn_work_fn(struct work_struct * work)2364 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2365 {
2366 struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2367 cleanup_work);
2368 struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2369
2370 mutex_lock(&conn->ep_mutex);
2371 /*
2372 * Get a ref to the ep, so we don't release its ID until after
2373 * userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2374 */
2375 if (conn->ep)
2376 get_device(&conn->ep->dev);
2377 iscsi_ep_disconnect(conn, false);
2378
2379 if (system_state != SYSTEM_RUNNING) {
2380 /*
2381 * If the user has set up for the session to never timeout
2382 * then hang like they wanted. For all other cases fail right
2383 * away since userspace is not going to relogin.
2384 */
2385 if (session->recovery_tmo > 0)
2386 session->recovery_tmo = 0;
2387 }
2388
2389 iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2390 mutex_unlock(&conn->ep_mutex);
2391 ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2392 }
2393
iscsi_free_session(struct iscsi_cls_session * session)2394 void iscsi_free_session(struct iscsi_cls_session *session)
2395 {
2396 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2397 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2398 put_device(&session->dev);
2399 }
2400 EXPORT_SYMBOL_GPL(iscsi_free_session);
2401
2402 /**
2403 * iscsi_create_conn - create iscsi class connection
2404 * @session: iscsi cls session
2405 * @dd_size: private driver data size
2406 * @cid: connection id
2407 *
2408 * This can be called from a LLD or iscsi_transport. The connection
2409 * is child of the session so cid must be unique for all connections
2410 * on the session.
2411 *
2412 * Since we do not support MCS, cid will normally be zero. In some cases
2413 * for software iscsi we could be trying to preallocate a connection struct
2414 * in which case there could be two connection structs and cid would be
2415 * non-zero.
2416 */
2417 struct iscsi_cls_conn *
iscsi_create_conn(struct iscsi_cls_session * session,int dd_size,uint32_t cid)2418 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2419 {
2420 struct iscsi_transport *transport = session->transport;
2421 struct iscsi_cls_conn *conn;
2422 unsigned long flags;
2423 int err;
2424
2425 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2426 if (!conn)
2427 return NULL;
2428 if (dd_size)
2429 conn->dd_data = &conn[1];
2430
2431 mutex_init(&conn->ep_mutex);
2432 spin_lock_init(&conn->lock);
2433 INIT_LIST_HEAD(&conn->conn_list);
2434 INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2435 conn->transport = transport;
2436 conn->cid = cid;
2437 WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2438
2439 /* this is released in the dev's release function */
2440 if (!get_device(&session->dev))
2441 goto free_conn;
2442
2443 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2444 conn->dev.parent = &session->dev;
2445 conn->dev.release = iscsi_conn_release;
2446 err = device_register(&conn->dev);
2447 if (err) {
2448 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2449 "register connection's dev\n");
2450 goto release_parent_ref;
2451 }
2452 err = transport_register_device(&conn->dev);
2453 if (err) {
2454 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2455 "register transport's dev\n");
2456 goto release_conn_ref;
2457 }
2458
2459 spin_lock_irqsave(&connlock, flags);
2460 list_add(&conn->conn_list, &connlist);
2461 spin_unlock_irqrestore(&connlock, flags);
2462
2463 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2464 return conn;
2465
2466 release_conn_ref:
2467 device_unregister(&conn->dev);
2468 put_device(&session->dev);
2469 return NULL;
2470 release_parent_ref:
2471 put_device(&session->dev);
2472 free_conn:
2473 kfree(conn);
2474 return NULL;
2475 }
2476
2477 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2478
2479 /**
2480 * iscsi_destroy_conn - destroy iscsi class connection
2481 * @conn: iscsi cls session
2482 *
2483 * This can be called from a LLD or iscsi_transport.
2484 */
iscsi_destroy_conn(struct iscsi_cls_conn * conn)2485 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2486 {
2487 unsigned long flags;
2488
2489 spin_lock_irqsave(&connlock, flags);
2490 list_del(&conn->conn_list);
2491 spin_unlock_irqrestore(&connlock, flags);
2492
2493 transport_unregister_device(&conn->dev);
2494 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2495 device_unregister(&conn->dev);
2496 return 0;
2497 }
2498 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2499
iscsi_put_conn(struct iscsi_cls_conn * conn)2500 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2501 {
2502 put_device(&conn->dev);
2503 }
2504 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2505
iscsi_get_conn(struct iscsi_cls_conn * conn)2506 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2507 {
2508 get_device(&conn->dev);
2509 }
2510 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2511
2512 /*
2513 * iscsi interface functions
2514 */
2515 static struct iscsi_internal *
iscsi_if_transport_lookup(struct iscsi_transport * tt)2516 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2517 {
2518 struct iscsi_internal *priv;
2519 unsigned long flags;
2520
2521 spin_lock_irqsave(&iscsi_transport_lock, flags);
2522 list_for_each_entry(priv, &iscsi_transports, list) {
2523 if (tt == priv->iscsi_transport) {
2524 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2525 return priv;
2526 }
2527 }
2528 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2529 return NULL;
2530 }
2531
2532 static int
iscsi_multicast_skb(struct sk_buff * skb,uint32_t group,gfp_t gfp)2533 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2534 {
2535 return nlmsg_multicast(nls, skb, 0, group, gfp);
2536 }
2537
2538 static int
iscsi_unicast_skb(struct sk_buff * skb,u32 portid)2539 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2540 {
2541 return nlmsg_unicast(nls, skb, portid);
2542 }
2543
iscsi_recv_pdu(struct iscsi_cls_conn * conn,struct iscsi_hdr * hdr,char * data,uint32_t data_size)2544 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2545 char *data, uint32_t data_size)
2546 {
2547 struct nlmsghdr *nlh;
2548 struct sk_buff *skb;
2549 struct iscsi_uevent *ev;
2550 char *pdu;
2551 struct iscsi_internal *priv;
2552 int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2553 data_size);
2554
2555 priv = iscsi_if_transport_lookup(conn->transport);
2556 if (!priv)
2557 return -EINVAL;
2558
2559 skb = alloc_skb(len, GFP_ATOMIC);
2560 if (!skb) {
2561 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2562 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2563 "control PDU: OOM\n");
2564 return -ENOMEM;
2565 }
2566
2567 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2568 ev = nlmsg_data(nlh);
2569 memset(ev, 0, sizeof(*ev));
2570 ev->transport_handle = iscsi_handle(conn->transport);
2571 ev->type = ISCSI_KEVENT_RECV_PDU;
2572 ev->r.recv_req.cid = conn->cid;
2573 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2574 pdu = (char*)ev + sizeof(*ev);
2575 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2576 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2577
2578 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2579 }
2580 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2581
iscsi_offload_mesg(struct Scsi_Host * shost,struct iscsi_transport * transport,uint32_t type,char * data,uint16_t data_size)2582 int iscsi_offload_mesg(struct Scsi_Host *shost,
2583 struct iscsi_transport *transport, uint32_t type,
2584 char *data, uint16_t data_size)
2585 {
2586 struct nlmsghdr *nlh;
2587 struct sk_buff *skb;
2588 struct iscsi_uevent *ev;
2589 int len = nlmsg_total_size(sizeof(*ev) + data_size);
2590
2591 skb = alloc_skb(len, GFP_ATOMIC);
2592 if (!skb) {
2593 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2594 return -ENOMEM;
2595 }
2596
2597 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2598 ev = nlmsg_data(nlh);
2599 memset(ev, 0, sizeof(*ev));
2600 ev->type = type;
2601 ev->transport_handle = iscsi_handle(transport);
2602 switch (type) {
2603 case ISCSI_KEVENT_PATH_REQ:
2604 ev->r.req_path.host_no = shost->host_no;
2605 break;
2606 case ISCSI_KEVENT_IF_DOWN:
2607 ev->r.notify_if_down.host_no = shost->host_no;
2608 break;
2609 }
2610
2611 memcpy((char *)ev + sizeof(*ev), data, data_size);
2612
2613 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2614 }
2615 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2616
iscsi_conn_error_event(struct iscsi_cls_conn * conn,enum iscsi_err error)2617 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2618 {
2619 struct nlmsghdr *nlh;
2620 struct sk_buff *skb;
2621 struct iscsi_uevent *ev;
2622 struct iscsi_internal *priv;
2623 int len = nlmsg_total_size(sizeof(*ev));
2624 unsigned long flags;
2625 int state;
2626
2627 spin_lock_irqsave(&conn->lock, flags);
2628 /*
2629 * Userspace will only do a stop call if we are at least bound. And, we
2630 * only need to do the in kernel cleanup if in the UP state so cmds can
2631 * be released to upper layers. If in other states just wait for
2632 * userspace to avoid races that can leave the cleanup_work queued.
2633 */
2634 state = READ_ONCE(conn->state);
2635 switch (state) {
2636 case ISCSI_CONN_BOUND:
2637 case ISCSI_CONN_UP:
2638 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2639 &conn->flags)) {
2640 queue_work(iscsi_conn_cleanup_workq,
2641 &conn->cleanup_work);
2642 }
2643 break;
2644 default:
2645 ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2646 state);
2647 break;
2648 }
2649 spin_unlock_irqrestore(&conn->lock, flags);
2650
2651 priv = iscsi_if_transport_lookup(conn->transport);
2652 if (!priv)
2653 return;
2654
2655 skb = alloc_skb(len, GFP_ATOMIC);
2656 if (!skb) {
2657 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2658 "conn error (%d)\n", error);
2659 return;
2660 }
2661
2662 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2663 ev = nlmsg_data(nlh);
2664 ev->transport_handle = iscsi_handle(conn->transport);
2665 ev->type = ISCSI_KEVENT_CONN_ERROR;
2666 ev->r.connerror.error = error;
2667 ev->r.connerror.cid = conn->cid;
2668 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2669
2670 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2671
2672 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2673 error);
2674 }
2675 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2676
iscsi_conn_login_event(struct iscsi_cls_conn * conn,enum iscsi_conn_state state)2677 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2678 enum iscsi_conn_state state)
2679 {
2680 struct nlmsghdr *nlh;
2681 struct sk_buff *skb;
2682 struct iscsi_uevent *ev;
2683 struct iscsi_internal *priv;
2684 int len = nlmsg_total_size(sizeof(*ev));
2685
2686 priv = iscsi_if_transport_lookup(conn->transport);
2687 if (!priv)
2688 return;
2689
2690 skb = alloc_skb(len, GFP_ATOMIC);
2691 if (!skb) {
2692 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2693 "conn login (%d)\n", state);
2694 return;
2695 }
2696
2697 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2698 ev = nlmsg_data(nlh);
2699 ev->transport_handle = iscsi_handle(conn->transport);
2700 ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2701 ev->r.conn_login.state = state;
2702 ev->r.conn_login.cid = conn->cid;
2703 ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2704 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2705
2706 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2707 state);
2708 }
2709 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2710
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)2711 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2712 enum iscsi_host_event_code code, uint32_t data_size,
2713 uint8_t *data)
2714 {
2715 struct nlmsghdr *nlh;
2716 struct sk_buff *skb;
2717 struct iscsi_uevent *ev;
2718 int len = nlmsg_total_size(sizeof(*ev) + data_size);
2719
2720 skb = alloc_skb(len, GFP_NOIO);
2721 if (!skb) {
2722 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2723 host_no, code);
2724 return;
2725 }
2726
2727 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2728 ev = nlmsg_data(nlh);
2729 ev->transport_handle = iscsi_handle(transport);
2730 ev->type = ISCSI_KEVENT_HOST_EVENT;
2731 ev->r.host_event.host_no = host_no;
2732 ev->r.host_event.code = code;
2733 ev->r.host_event.data_size = data_size;
2734
2735 if (data_size)
2736 memcpy((char *)ev + sizeof(*ev), data, data_size);
2737
2738 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2739 }
2740 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2741
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)2742 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2743 uint32_t status, uint32_t pid, uint32_t data_size,
2744 uint8_t *data)
2745 {
2746 struct nlmsghdr *nlh;
2747 struct sk_buff *skb;
2748 struct iscsi_uevent *ev;
2749 int len = nlmsg_total_size(sizeof(*ev) + data_size);
2750
2751 skb = alloc_skb(len, GFP_NOIO);
2752 if (!skb) {
2753 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2754 return;
2755 }
2756
2757 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2758 ev = nlmsg_data(nlh);
2759 ev->transport_handle = iscsi_handle(transport);
2760 ev->type = ISCSI_KEVENT_PING_COMP;
2761 ev->r.ping_comp.host_no = host_no;
2762 ev->r.ping_comp.status = status;
2763 ev->r.ping_comp.pid = pid;
2764 ev->r.ping_comp.data_size = data_size;
2765 memcpy((char *)ev + sizeof(*ev), data, data_size);
2766
2767 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2768 }
2769 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2770
2771 static int
iscsi_if_send_reply(u32 portid,int type,void * payload,int size)2772 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2773 {
2774 struct sk_buff *skb;
2775 struct nlmsghdr *nlh;
2776 int len = nlmsg_total_size(size);
2777
2778 skb = alloc_skb(len, GFP_ATOMIC);
2779 if (!skb) {
2780 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2781 return -ENOMEM;
2782 }
2783
2784 nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2785 memcpy(nlmsg_data(nlh), payload, size);
2786 return iscsi_unicast_skb(skb, portid);
2787 }
2788
2789 static int
iscsi_if_get_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)2790 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2791 {
2792 struct iscsi_uevent *ev = nlmsg_data(nlh);
2793 struct iscsi_stats *stats;
2794 struct sk_buff *skbstat;
2795 struct iscsi_cls_conn *conn;
2796 struct nlmsghdr *nlhstat;
2797 struct iscsi_uevent *evstat;
2798 struct iscsi_internal *priv;
2799 int len = nlmsg_total_size(sizeof(*ev) +
2800 sizeof(struct iscsi_stats) +
2801 sizeof(struct iscsi_stats_custom) *
2802 ISCSI_STATS_CUSTOM_MAX);
2803 int err = 0;
2804
2805 priv = iscsi_if_transport_lookup(transport);
2806 if (!priv)
2807 return -EINVAL;
2808
2809 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2810 if (!conn)
2811 return -EEXIST;
2812
2813 do {
2814 int actual_size;
2815
2816 skbstat = alloc_skb(len, GFP_ATOMIC);
2817 if (!skbstat) {
2818 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2819 "deliver stats: OOM\n");
2820 return -ENOMEM;
2821 }
2822
2823 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2824 (len - sizeof(*nlhstat)), 0);
2825 evstat = nlmsg_data(nlhstat);
2826 memset(evstat, 0, sizeof(*evstat));
2827 evstat->transport_handle = iscsi_handle(conn->transport);
2828 evstat->type = nlh->nlmsg_type;
2829 evstat->u.get_stats.cid =
2830 ev->u.get_stats.cid;
2831 evstat->u.get_stats.sid =
2832 ev->u.get_stats.sid;
2833 stats = (struct iscsi_stats *)
2834 ((char*)evstat + sizeof(*evstat));
2835 memset(stats, 0, sizeof(*stats));
2836
2837 transport->get_stats(conn, stats);
2838 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2839 sizeof(struct iscsi_stats) +
2840 sizeof(struct iscsi_stats_custom) *
2841 stats->custom_length);
2842 actual_size -= sizeof(*nlhstat);
2843 actual_size = nlmsg_msg_size(actual_size);
2844 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2845 nlhstat->nlmsg_len = actual_size;
2846
2847 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2848 GFP_ATOMIC);
2849 } while (err < 0 && err != -ECONNREFUSED);
2850
2851 return err;
2852 }
2853
2854 /**
2855 * iscsi_session_event - send session destr. completion event
2856 * @session: iscsi class session
2857 * @event: type of event
2858 */
iscsi_session_event(struct iscsi_cls_session * session,enum iscsi_uevent_e event)2859 int iscsi_session_event(struct iscsi_cls_session *session,
2860 enum iscsi_uevent_e event)
2861 {
2862 struct iscsi_internal *priv;
2863 struct Scsi_Host *shost;
2864 struct iscsi_uevent *ev;
2865 struct sk_buff *skb;
2866 struct nlmsghdr *nlh;
2867 int rc, len = nlmsg_total_size(sizeof(*ev));
2868
2869 priv = iscsi_if_transport_lookup(session->transport);
2870 if (!priv)
2871 return -EINVAL;
2872 shost = iscsi_session_to_shost(session);
2873
2874 skb = alloc_skb(len, GFP_KERNEL);
2875 if (!skb) {
2876 iscsi_cls_session_printk(KERN_ERR, session,
2877 "Cannot notify userspace of session "
2878 "event %u\n", event);
2879 return -ENOMEM;
2880 }
2881
2882 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2883 ev = nlmsg_data(nlh);
2884 ev->transport_handle = iscsi_handle(session->transport);
2885
2886 ev->type = event;
2887 switch (event) {
2888 case ISCSI_KEVENT_DESTROY_SESSION:
2889 ev->r.d_session.host_no = shost->host_no;
2890 ev->r.d_session.sid = session->sid;
2891 break;
2892 case ISCSI_KEVENT_CREATE_SESSION:
2893 ev->r.c_session_ret.host_no = shost->host_no;
2894 ev->r.c_session_ret.sid = session->sid;
2895 break;
2896 case ISCSI_KEVENT_UNBIND_SESSION:
2897 ev->r.unbind_session.host_no = shost->host_no;
2898 ev->r.unbind_session.sid = session->sid;
2899 break;
2900 default:
2901 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2902 "%u.\n", event);
2903 kfree_skb(skb);
2904 return -EINVAL;
2905 }
2906
2907 /*
2908 * this will occur if the daemon is not up, so we just warn
2909 * the user and when the daemon is restarted it will handle it
2910 */
2911 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2912 if (rc == -ESRCH)
2913 iscsi_cls_session_printk(KERN_ERR, session,
2914 "Cannot notify userspace of session "
2915 "event %u. Check iscsi daemon\n",
2916 event);
2917
2918 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2919 event, rc);
2920 return rc;
2921 }
2922 EXPORT_SYMBOL_GPL(iscsi_session_event);
2923
2924 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)2925 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2926 struct iscsi_uevent *ev, pid_t pid,
2927 uint32_t initial_cmdsn, uint16_t cmds_max,
2928 uint16_t queue_depth)
2929 {
2930 struct iscsi_transport *transport = priv->iscsi_transport;
2931 struct iscsi_cls_session *session;
2932 struct Scsi_Host *shost;
2933
2934 session = transport->create_session(ep, cmds_max, queue_depth,
2935 initial_cmdsn);
2936 if (!session)
2937 return -ENOMEM;
2938
2939 session->creator = pid;
2940 shost = iscsi_session_to_shost(session);
2941 ev->r.c_session_ret.host_no = shost->host_no;
2942 ev->r.c_session_ret.sid = session->sid;
2943 ISCSI_DBG_TRANS_SESSION(session,
2944 "Completed creating transport session\n");
2945 return 0;
2946 }
2947
2948 static int
iscsi_if_create_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)2949 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2950 {
2951 struct iscsi_cls_conn *conn;
2952 struct iscsi_cls_session *session;
2953
2954 session = iscsi_session_lookup(ev->u.c_conn.sid);
2955 if (!session) {
2956 printk(KERN_ERR "iscsi: invalid session %d.\n",
2957 ev->u.c_conn.sid);
2958 return -EINVAL;
2959 }
2960
2961 conn = transport->create_conn(session, ev->u.c_conn.cid);
2962 if (!conn) {
2963 iscsi_cls_session_printk(KERN_ERR, session,
2964 "couldn't create a new connection.");
2965 return -ENOMEM;
2966 }
2967
2968 ev->r.c_conn_ret.sid = session->sid;
2969 ev->r.c_conn_ret.cid = conn->cid;
2970
2971 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2972 return 0;
2973 }
2974
2975 static int
iscsi_if_destroy_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)2976 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2977 {
2978 struct iscsi_cls_conn *conn;
2979
2980 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2981 if (!conn)
2982 return -EINVAL;
2983
2984 ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
2985 flush_work(&conn->cleanup_work);
2986 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2987
2988 if (transport->destroy_conn)
2989 transport->destroy_conn(conn);
2990 return 0;
2991 }
2992
2993 static int
iscsi_if_set_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)2994 iscsi_if_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
2995 {
2996 char *data = (char*)ev + sizeof(*ev);
2997 struct iscsi_cls_conn *conn;
2998 struct iscsi_cls_session *session;
2999 int err = 0, value = 0, state;
3000
3001 if (ev->u.set_param.len > rlen ||
3002 ev->u.set_param.len > PAGE_SIZE)
3003 return -EINVAL;
3004
3005 session = iscsi_session_lookup(ev->u.set_param.sid);
3006 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
3007 if (!conn || !session)
3008 return -EINVAL;
3009
3010 /* data will be regarded as NULL-ended string, do length check */
3011 if (strlen(data) > ev->u.set_param.len)
3012 return -EINVAL;
3013
3014 switch (ev->u.set_param.param) {
3015 case ISCSI_PARAM_SESS_RECOVERY_TMO:
3016 sscanf(data, "%d", &value);
3017 if (!session->recovery_tmo_sysfs_override)
3018 session->recovery_tmo = value;
3019 break;
3020 default:
3021 state = READ_ONCE(conn->state);
3022 if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
3023 err = transport->set_param(conn, ev->u.set_param.param,
3024 data, ev->u.set_param.len);
3025 } else {
3026 return -ENOTCONN;
3027 }
3028 }
3029
3030 return err;
3031 }
3032
iscsi_if_ep_connect(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type)3033 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3034 struct iscsi_uevent *ev, int msg_type)
3035 {
3036 struct iscsi_endpoint *ep;
3037 struct sockaddr *dst_addr;
3038 struct Scsi_Host *shost = NULL;
3039 int non_blocking, err = 0;
3040
3041 if (!transport->ep_connect)
3042 return -EINVAL;
3043
3044 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3045 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
3046 if (!shost) {
3047 printk(KERN_ERR "ep connect failed. Could not find "
3048 "host no %u\n",
3049 ev->u.ep_connect_through_host.host_no);
3050 return -ENODEV;
3051 }
3052 non_blocking = ev->u.ep_connect_through_host.non_blocking;
3053 } else
3054 non_blocking = ev->u.ep_connect.non_blocking;
3055
3056 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3057 ep = transport->ep_connect(shost, dst_addr, non_blocking);
3058 if (IS_ERR(ep)) {
3059 err = PTR_ERR(ep);
3060 goto release_host;
3061 }
3062
3063 ev->r.ep_connect_ret.handle = ep->id;
3064 release_host:
3065 if (shost)
3066 scsi_host_put(shost);
3067 return err;
3068 }
3069
iscsi_if_ep_disconnect(struct iscsi_transport * transport,u64 ep_handle)3070 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3071 u64 ep_handle)
3072 {
3073 struct iscsi_cls_conn *conn;
3074 struct iscsi_endpoint *ep;
3075
3076 if (!transport->ep_disconnect)
3077 return -EINVAL;
3078
3079 ep = iscsi_lookup_endpoint(ep_handle);
3080 if (!ep)
3081 return -EINVAL;
3082
3083 conn = ep->conn;
3084 if (!conn) {
3085 /*
3086 * conn was not even bound yet, so we can't get iscsi conn
3087 * failures yet.
3088 */
3089 transport->ep_disconnect(ep);
3090 goto put_ep;
3091 }
3092
3093 mutex_lock(&conn->ep_mutex);
3094 iscsi_if_disconnect_bound_ep(conn, ep, false);
3095 mutex_unlock(&conn->ep_mutex);
3096 put_ep:
3097 iscsi_put_endpoint(ep);
3098 return 0;
3099 }
3100
3101 static int
iscsi_if_transport_ep(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type,u32 rlen)3102 iscsi_if_transport_ep(struct iscsi_transport *transport,
3103 struct iscsi_uevent *ev, int msg_type, u32 rlen)
3104 {
3105 struct iscsi_endpoint *ep;
3106 int rc = 0;
3107
3108 switch (msg_type) {
3109 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3110 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3111 if (rlen < sizeof(struct sockaddr))
3112 rc = -EINVAL;
3113 else
3114 rc = iscsi_if_ep_connect(transport, ev, msg_type);
3115 break;
3116 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3117 if (!transport->ep_poll)
3118 return -EINVAL;
3119
3120 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3121 if (!ep)
3122 return -EINVAL;
3123
3124 ev->r.retcode = transport->ep_poll(ep,
3125 ev->u.ep_poll.timeout_ms);
3126 iscsi_put_endpoint(ep);
3127 break;
3128 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3129 rc = iscsi_if_ep_disconnect(transport,
3130 ev->u.ep_disconnect.ep_handle);
3131 break;
3132 }
3133 return rc;
3134 }
3135
3136 static int
iscsi_tgt_dscvr(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3137 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3138 struct iscsi_uevent *ev, u32 rlen)
3139 {
3140 struct Scsi_Host *shost;
3141 struct sockaddr *dst_addr;
3142 int err;
3143
3144 if (rlen < sizeof(*dst_addr))
3145 return -EINVAL;
3146
3147 if (!transport->tgt_dscvr)
3148 return -EINVAL;
3149
3150 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3151 if (!shost) {
3152 printk(KERN_ERR "target discovery could not find host no %u\n",
3153 ev->u.tgt_dscvr.host_no);
3154 return -ENODEV;
3155 }
3156
3157
3158 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3159 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3160 ev->u.tgt_dscvr.enable, dst_addr);
3161 scsi_host_put(shost);
3162 return err;
3163 }
3164
3165 static int
iscsi_set_host_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3166 iscsi_set_host_param(struct iscsi_transport *transport,
3167 struct iscsi_uevent *ev, u32 rlen)
3168 {
3169 char *data = (char*)ev + sizeof(*ev);
3170 struct Scsi_Host *shost;
3171 int err;
3172
3173 if (!transport->set_host_param)
3174 return -ENOSYS;
3175
3176 if (ev->u.set_host_param.len > rlen ||
3177 ev->u.set_host_param.len > PAGE_SIZE)
3178 return -EINVAL;
3179
3180 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3181 if (!shost) {
3182 printk(KERN_ERR "set_host_param could not find host no %u\n",
3183 ev->u.set_host_param.host_no);
3184 return -ENODEV;
3185 }
3186
3187 /* see similar check in iscsi_if_set_param() */
3188 if (strlen(data) > ev->u.set_host_param.len)
3189 return -EINVAL;
3190
3191 err = transport->set_host_param(shost, ev->u.set_host_param.param,
3192 data, ev->u.set_host_param.len);
3193 scsi_host_put(shost);
3194 return err;
3195 }
3196
3197 static int
iscsi_set_path(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3198 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3199 {
3200 struct Scsi_Host *shost;
3201 struct iscsi_path *params;
3202 int err;
3203
3204 if (rlen < sizeof(*params))
3205 return -EINVAL;
3206
3207 if (!transport->set_path)
3208 return -ENOSYS;
3209
3210 shost = scsi_host_lookup(ev->u.set_path.host_no);
3211 if (!shost) {
3212 printk(KERN_ERR "set path could not find host no %u\n",
3213 ev->u.set_path.host_no);
3214 return -ENODEV;
3215 }
3216
3217 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3218 err = transport->set_path(shost, params);
3219
3220 scsi_host_put(shost);
3221 return err;
3222 }
3223
iscsi_session_has_conns(int sid)3224 static int iscsi_session_has_conns(int sid)
3225 {
3226 struct iscsi_cls_conn *conn;
3227 unsigned long flags;
3228 int found = 0;
3229
3230 spin_lock_irqsave(&connlock, flags);
3231 list_for_each_entry(conn, &connlist, conn_list) {
3232 if (iscsi_conn_get_sid(conn) == sid) {
3233 found = 1;
3234 break;
3235 }
3236 }
3237 spin_unlock_irqrestore(&connlock, flags);
3238
3239 return found;
3240 }
3241
3242 static int
iscsi_set_iface_params(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3243 iscsi_set_iface_params(struct iscsi_transport *transport,
3244 struct iscsi_uevent *ev, uint32_t len)
3245 {
3246 char *data = (char *)ev + sizeof(*ev);
3247 struct Scsi_Host *shost;
3248 int err;
3249
3250 if (!transport->set_iface_param)
3251 return -ENOSYS;
3252
3253 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3254 if (!shost) {
3255 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3256 ev->u.set_iface_params.host_no);
3257 return -ENODEV;
3258 }
3259
3260 err = transport->set_iface_param(shost, data, len);
3261 scsi_host_put(shost);
3262 return err;
3263 }
3264
3265 static int
iscsi_send_ping(struct iscsi_transport * transport,struct iscsi_uevent * ev,u32 rlen)3266 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3267 {
3268 struct Scsi_Host *shost;
3269 struct sockaddr *dst_addr;
3270 int err;
3271
3272 if (rlen < sizeof(*dst_addr))
3273 return -EINVAL;
3274
3275 if (!transport->send_ping)
3276 return -ENOSYS;
3277
3278 shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3279 if (!shost) {
3280 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3281 ev->u.iscsi_ping.host_no);
3282 return -ENODEV;
3283 }
3284
3285 dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3286 err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3287 ev->u.iscsi_ping.iface_type,
3288 ev->u.iscsi_ping.payload_size,
3289 ev->u.iscsi_ping.pid,
3290 dst_addr);
3291 scsi_host_put(shost);
3292 return err;
3293 }
3294
3295 static int
iscsi_get_chap(struct iscsi_transport * transport,struct nlmsghdr * nlh)3296 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3297 {
3298 struct iscsi_uevent *ev = nlmsg_data(nlh);
3299 struct Scsi_Host *shost = NULL;
3300 struct iscsi_chap_rec *chap_rec;
3301 struct iscsi_internal *priv;
3302 struct sk_buff *skbchap;
3303 struct nlmsghdr *nlhchap;
3304 struct iscsi_uevent *evchap;
3305 uint32_t chap_buf_size;
3306 int len, err = 0;
3307 char *buf;
3308
3309 if (!transport->get_chap)
3310 return -EINVAL;
3311
3312 priv = iscsi_if_transport_lookup(transport);
3313 if (!priv)
3314 return -EINVAL;
3315
3316 chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3317 len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3318
3319 shost = scsi_host_lookup(ev->u.get_chap.host_no);
3320 if (!shost) {
3321 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3322 __func__, ev->u.get_chap.host_no);
3323 return -ENODEV;
3324 }
3325
3326 do {
3327 int actual_size;
3328
3329 skbchap = alloc_skb(len, GFP_KERNEL);
3330 if (!skbchap) {
3331 printk(KERN_ERR "can not deliver chap: OOM\n");
3332 err = -ENOMEM;
3333 goto exit_get_chap;
3334 }
3335
3336 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3337 (len - sizeof(*nlhchap)), 0);
3338 evchap = nlmsg_data(nlhchap);
3339 memset(evchap, 0, sizeof(*evchap));
3340 evchap->transport_handle = iscsi_handle(transport);
3341 evchap->type = nlh->nlmsg_type;
3342 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3343 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3344 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3345 buf = (char *)evchap + sizeof(*evchap);
3346 memset(buf, 0, chap_buf_size);
3347
3348 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3349 &evchap->u.get_chap.num_entries, buf);
3350
3351 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3352 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3353 nlhchap->nlmsg_len = actual_size;
3354
3355 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3356 GFP_KERNEL);
3357 } while (err < 0 && err != -ECONNREFUSED);
3358
3359 exit_get_chap:
3360 scsi_host_put(shost);
3361 return err;
3362 }
3363
iscsi_set_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3364 static int iscsi_set_chap(struct iscsi_transport *transport,
3365 struct iscsi_uevent *ev, uint32_t len)
3366 {
3367 char *data = (char *)ev + sizeof(*ev);
3368 struct Scsi_Host *shost;
3369 int err = 0;
3370
3371 if (!transport->set_chap)
3372 return -ENOSYS;
3373
3374 shost = scsi_host_lookup(ev->u.set_path.host_no);
3375 if (!shost) {
3376 pr_err("%s could not find host no %u\n",
3377 __func__, ev->u.set_path.host_no);
3378 return -ENODEV;
3379 }
3380
3381 err = transport->set_chap(shost, data, len);
3382 scsi_host_put(shost);
3383 return err;
3384 }
3385
iscsi_delete_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev)3386 static int iscsi_delete_chap(struct iscsi_transport *transport,
3387 struct iscsi_uevent *ev)
3388 {
3389 struct Scsi_Host *shost;
3390 int err = 0;
3391
3392 if (!transport->delete_chap)
3393 return -ENOSYS;
3394
3395 shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3396 if (!shost) {
3397 printk(KERN_ERR "%s could not find host no %u\n",
3398 __func__, ev->u.delete_chap.host_no);
3399 return -ENODEV;
3400 }
3401
3402 err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3403 scsi_host_put(shost);
3404 return err;
3405 }
3406
3407 static const struct {
3408 enum iscsi_discovery_parent_type value;
3409 char *name;
3410 } iscsi_discovery_parent_names[] = {
3411 {ISCSI_DISC_PARENT_UNKNOWN, "Unknown" },
3412 {ISCSI_DISC_PARENT_SENDTGT, "Sendtarget" },
3413 {ISCSI_DISC_PARENT_ISNS, "isns" },
3414 };
3415
iscsi_get_discovery_parent_name(int parent_type)3416 char *iscsi_get_discovery_parent_name(int parent_type)
3417 {
3418 int i;
3419 char *state = "Unknown!";
3420
3421 for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3422 if (iscsi_discovery_parent_names[i].value & parent_type) {
3423 state = iscsi_discovery_parent_names[i].name;
3424 break;
3425 }
3426 }
3427 return state;
3428 }
3429 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3430
iscsi_set_flashnode_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3431 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3432 struct iscsi_uevent *ev, uint32_t len)
3433 {
3434 char *data = (char *)ev + sizeof(*ev);
3435 struct Scsi_Host *shost;
3436 struct iscsi_bus_flash_session *fnode_sess;
3437 struct iscsi_bus_flash_conn *fnode_conn;
3438 struct device *dev;
3439 uint32_t idx;
3440 int err = 0;
3441
3442 if (!transport->set_flashnode_param) {
3443 err = -ENOSYS;
3444 goto exit_set_fnode;
3445 }
3446
3447 shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3448 if (!shost) {
3449 pr_err("%s could not find host no %u\n",
3450 __func__, ev->u.set_flashnode.host_no);
3451 err = -ENODEV;
3452 goto exit_set_fnode;
3453 }
3454
3455 idx = ev->u.set_flashnode.flashnode_idx;
3456 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3457 if (!fnode_sess) {
3458 pr_err("%s could not find flashnode %u for host no %u\n",
3459 __func__, idx, ev->u.set_flashnode.host_no);
3460 err = -ENODEV;
3461 goto put_host;
3462 }
3463
3464 dev = iscsi_find_flashnode_conn(fnode_sess);
3465 if (!dev) {
3466 err = -ENODEV;
3467 goto put_sess;
3468 }
3469
3470 fnode_conn = iscsi_dev_to_flash_conn(dev);
3471 err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3472 put_device(dev);
3473
3474 put_sess:
3475 put_device(&fnode_sess->dev);
3476
3477 put_host:
3478 scsi_host_put(shost);
3479
3480 exit_set_fnode:
3481 return err;
3482 }
3483
iscsi_new_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3484 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3485 struct iscsi_uevent *ev, uint32_t len)
3486 {
3487 char *data = (char *)ev + sizeof(*ev);
3488 struct Scsi_Host *shost;
3489 int index;
3490 int err = 0;
3491
3492 if (!transport->new_flashnode) {
3493 err = -ENOSYS;
3494 goto exit_new_fnode;
3495 }
3496
3497 shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3498 if (!shost) {
3499 pr_err("%s could not find host no %u\n",
3500 __func__, ev->u.new_flashnode.host_no);
3501 err = -ENODEV;
3502 goto put_host;
3503 }
3504
3505 index = transport->new_flashnode(shost, data, len);
3506
3507 if (index >= 0)
3508 ev->r.new_flashnode_ret.flashnode_idx = index;
3509 else
3510 err = -EIO;
3511
3512 put_host:
3513 scsi_host_put(shost);
3514
3515 exit_new_fnode:
3516 return err;
3517 }
3518
iscsi_del_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3519 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3520 struct iscsi_uevent *ev)
3521 {
3522 struct Scsi_Host *shost;
3523 struct iscsi_bus_flash_session *fnode_sess;
3524 uint32_t idx;
3525 int err = 0;
3526
3527 if (!transport->del_flashnode) {
3528 err = -ENOSYS;
3529 goto exit_del_fnode;
3530 }
3531
3532 shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3533 if (!shost) {
3534 pr_err("%s could not find host no %u\n",
3535 __func__, ev->u.del_flashnode.host_no);
3536 err = -ENODEV;
3537 goto put_host;
3538 }
3539
3540 idx = ev->u.del_flashnode.flashnode_idx;
3541 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3542 if (!fnode_sess) {
3543 pr_err("%s could not find flashnode %u for host no %u\n",
3544 __func__, idx, ev->u.del_flashnode.host_no);
3545 err = -ENODEV;
3546 goto put_host;
3547 }
3548
3549 err = transport->del_flashnode(fnode_sess);
3550 put_device(&fnode_sess->dev);
3551
3552 put_host:
3553 scsi_host_put(shost);
3554
3555 exit_del_fnode:
3556 return err;
3557 }
3558
iscsi_login_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3559 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3560 struct iscsi_uevent *ev)
3561 {
3562 struct Scsi_Host *shost;
3563 struct iscsi_bus_flash_session *fnode_sess;
3564 struct iscsi_bus_flash_conn *fnode_conn;
3565 struct device *dev;
3566 uint32_t idx;
3567 int err = 0;
3568
3569 if (!transport->login_flashnode) {
3570 err = -ENOSYS;
3571 goto exit_login_fnode;
3572 }
3573
3574 shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3575 if (!shost) {
3576 pr_err("%s could not find host no %u\n",
3577 __func__, ev->u.login_flashnode.host_no);
3578 err = -ENODEV;
3579 goto put_host;
3580 }
3581
3582 idx = ev->u.login_flashnode.flashnode_idx;
3583 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3584 if (!fnode_sess) {
3585 pr_err("%s could not find flashnode %u for host no %u\n",
3586 __func__, idx, ev->u.login_flashnode.host_no);
3587 err = -ENODEV;
3588 goto put_host;
3589 }
3590
3591 dev = iscsi_find_flashnode_conn(fnode_sess);
3592 if (!dev) {
3593 err = -ENODEV;
3594 goto put_sess;
3595 }
3596
3597 fnode_conn = iscsi_dev_to_flash_conn(dev);
3598 err = transport->login_flashnode(fnode_sess, fnode_conn);
3599 put_device(dev);
3600
3601 put_sess:
3602 put_device(&fnode_sess->dev);
3603
3604 put_host:
3605 scsi_host_put(shost);
3606
3607 exit_login_fnode:
3608 return err;
3609 }
3610
iscsi_logout_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3611 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3612 struct iscsi_uevent *ev)
3613 {
3614 struct Scsi_Host *shost;
3615 struct iscsi_bus_flash_session *fnode_sess;
3616 struct iscsi_bus_flash_conn *fnode_conn;
3617 struct device *dev;
3618 uint32_t idx;
3619 int err = 0;
3620
3621 if (!transport->logout_flashnode) {
3622 err = -ENOSYS;
3623 goto exit_logout_fnode;
3624 }
3625
3626 shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3627 if (!shost) {
3628 pr_err("%s could not find host no %u\n",
3629 __func__, ev->u.logout_flashnode.host_no);
3630 err = -ENODEV;
3631 goto put_host;
3632 }
3633
3634 idx = ev->u.logout_flashnode.flashnode_idx;
3635 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3636 if (!fnode_sess) {
3637 pr_err("%s could not find flashnode %u for host no %u\n",
3638 __func__, idx, ev->u.logout_flashnode.host_no);
3639 err = -ENODEV;
3640 goto put_host;
3641 }
3642
3643 dev = iscsi_find_flashnode_conn(fnode_sess);
3644 if (!dev) {
3645 err = -ENODEV;
3646 goto put_sess;
3647 }
3648
3649 fnode_conn = iscsi_dev_to_flash_conn(dev);
3650
3651 err = transport->logout_flashnode(fnode_sess, fnode_conn);
3652 put_device(dev);
3653
3654 put_sess:
3655 put_device(&fnode_sess->dev);
3656
3657 put_host:
3658 scsi_host_put(shost);
3659
3660 exit_logout_fnode:
3661 return err;
3662 }
3663
iscsi_logout_flashnode_sid(struct iscsi_transport * transport,struct iscsi_uevent * ev)3664 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3665 struct iscsi_uevent *ev)
3666 {
3667 struct Scsi_Host *shost;
3668 struct iscsi_cls_session *session;
3669 int err = 0;
3670
3671 if (!transport->logout_flashnode_sid) {
3672 err = -ENOSYS;
3673 goto exit_logout_sid;
3674 }
3675
3676 shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3677 if (!shost) {
3678 pr_err("%s could not find host no %u\n",
3679 __func__, ev->u.logout_flashnode.host_no);
3680 err = -ENODEV;
3681 goto put_host;
3682 }
3683
3684 session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3685 if (!session) {
3686 pr_err("%s could not find session id %u\n",
3687 __func__, ev->u.logout_flashnode_sid.sid);
3688 err = -EINVAL;
3689 goto put_host;
3690 }
3691
3692 err = transport->logout_flashnode_sid(session);
3693
3694 put_host:
3695 scsi_host_put(shost);
3696
3697 exit_logout_sid:
3698 return err;
3699 }
3700
3701 static int
iscsi_get_host_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)3702 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3703 {
3704 struct iscsi_uevent *ev = nlmsg_data(nlh);
3705 struct Scsi_Host *shost = NULL;
3706 struct iscsi_internal *priv;
3707 struct sk_buff *skbhost_stats;
3708 struct nlmsghdr *nlhhost_stats;
3709 struct iscsi_uevent *evhost_stats;
3710 int host_stats_size = 0;
3711 int len, err = 0;
3712 char *buf;
3713
3714 if (!transport->get_host_stats)
3715 return -ENOSYS;
3716
3717 priv = iscsi_if_transport_lookup(transport);
3718 if (!priv)
3719 return -EINVAL;
3720
3721 host_stats_size = sizeof(struct iscsi_offload_host_stats);
3722 len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3723
3724 shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3725 if (!shost) {
3726 pr_err("%s: failed. Could not find host no %u\n",
3727 __func__, ev->u.get_host_stats.host_no);
3728 return -ENODEV;
3729 }
3730
3731 do {
3732 int actual_size;
3733
3734 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3735 if (!skbhost_stats) {
3736 pr_err("cannot deliver host stats: OOM\n");
3737 err = -ENOMEM;
3738 goto exit_host_stats;
3739 }
3740
3741 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3742 (len - sizeof(*nlhhost_stats)), 0);
3743 evhost_stats = nlmsg_data(nlhhost_stats);
3744 memset(evhost_stats, 0, sizeof(*evhost_stats));
3745 evhost_stats->transport_handle = iscsi_handle(transport);
3746 evhost_stats->type = nlh->nlmsg_type;
3747 evhost_stats->u.get_host_stats.host_no =
3748 ev->u.get_host_stats.host_no;
3749 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3750 memset(buf, 0, host_stats_size);
3751
3752 err = transport->get_host_stats(shost, buf, host_stats_size);
3753 if (err) {
3754 kfree_skb(skbhost_stats);
3755 goto exit_host_stats;
3756 }
3757
3758 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3759 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3760 nlhhost_stats->nlmsg_len = actual_size;
3761
3762 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3763 GFP_KERNEL);
3764 } while (err < 0 && err != -ECONNREFUSED);
3765
3766 exit_host_stats:
3767 scsi_host_put(shost);
3768 return err;
3769 }
3770
iscsi_if_transport_conn(struct iscsi_transport * transport,struct nlmsghdr * nlh,u32 pdu_len)3771 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3772 struct nlmsghdr *nlh, u32 pdu_len)
3773 {
3774 struct iscsi_uevent *ev = nlmsg_data(nlh);
3775 struct iscsi_cls_session *session;
3776 struct iscsi_cls_conn *conn = NULL;
3777 struct iscsi_endpoint *ep;
3778 int err = 0;
3779
3780 switch (nlh->nlmsg_type) {
3781 case ISCSI_UEVENT_CREATE_CONN:
3782 return iscsi_if_create_conn(transport, ev);
3783 case ISCSI_UEVENT_DESTROY_CONN:
3784 return iscsi_if_destroy_conn(transport, ev);
3785 case ISCSI_UEVENT_STOP_CONN:
3786 return iscsi_if_stop_conn(transport, ev);
3787 }
3788
3789 /*
3790 * The following cmds need to be run under the ep_mutex so in kernel
3791 * conn cleanup (ep_disconnect + unbind and conn) is not done while
3792 * these are running. They also must not run if we have just run a conn
3793 * cleanup because they would set the state in a way that might allow
3794 * IO or send IO themselves.
3795 */
3796 switch (nlh->nlmsg_type) {
3797 case ISCSI_UEVENT_START_CONN:
3798 conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3799 ev->u.start_conn.cid);
3800 break;
3801 case ISCSI_UEVENT_BIND_CONN:
3802 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3803 break;
3804 case ISCSI_UEVENT_SEND_PDU:
3805 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3806 break;
3807 }
3808
3809 if (!conn)
3810 return -EINVAL;
3811
3812 mutex_lock(&conn->ep_mutex);
3813 spin_lock_irq(&conn->lock);
3814 if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3815 spin_unlock_irq(&conn->lock);
3816 mutex_unlock(&conn->ep_mutex);
3817 ev->r.retcode = -ENOTCONN;
3818 return 0;
3819 }
3820 spin_unlock_irq(&conn->lock);
3821
3822 switch (nlh->nlmsg_type) {
3823 case ISCSI_UEVENT_BIND_CONN:
3824 session = iscsi_session_lookup(ev->u.b_conn.sid);
3825 if (!session) {
3826 err = -EINVAL;
3827 break;
3828 }
3829
3830 ev->r.retcode = transport->bind_conn(session, conn,
3831 ev->u.b_conn.transport_eph,
3832 ev->u.b_conn.is_leading);
3833 if (!ev->r.retcode)
3834 WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3835
3836 if (ev->r.retcode || !transport->ep_connect)
3837 break;
3838
3839 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3840 if (ep) {
3841 ep->conn = conn;
3842 conn->ep = ep;
3843 iscsi_put_endpoint(ep);
3844 } else {
3845 err = -ENOTCONN;
3846 iscsi_cls_conn_printk(KERN_ERR, conn,
3847 "Could not set ep conn binding\n");
3848 }
3849 break;
3850 case ISCSI_UEVENT_START_CONN:
3851 ev->r.retcode = transport->start_conn(conn);
3852 if (!ev->r.retcode)
3853 WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3854
3855 break;
3856 case ISCSI_UEVENT_SEND_PDU:
3857 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3858 (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3859 err = -EINVAL;
3860 break;
3861 }
3862
3863 ev->r.retcode = transport->send_pdu(conn,
3864 (struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3865 (char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3866 ev->u.send_pdu.data_size);
3867 break;
3868 default:
3869 err = -ENOSYS;
3870 }
3871
3872 mutex_unlock(&conn->ep_mutex);
3873 return err;
3874 }
3875
3876 static int
iscsi_if_recv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,uint32_t * group)3877 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3878 {
3879 int err = 0;
3880 u32 portid;
3881 struct iscsi_uevent *ev = nlmsg_data(nlh);
3882 struct iscsi_transport *transport = NULL;
3883 struct iscsi_internal *priv;
3884 struct iscsi_cls_session *session;
3885 struct iscsi_endpoint *ep = NULL;
3886 u32 rlen;
3887
3888 if (!netlink_capable(skb, CAP_SYS_ADMIN))
3889 return -EPERM;
3890
3891 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3892 *group = ISCSI_NL_GRP_UIP;
3893 else
3894 *group = ISCSI_NL_GRP_ISCSID;
3895
3896 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3897 if (!priv)
3898 return -EINVAL;
3899 transport = priv->iscsi_transport;
3900
3901 if (!try_module_get(transport->owner))
3902 return -EINVAL;
3903
3904 portid = NETLINK_CB(skb).portid;
3905
3906 /*
3907 * Even though the remaining payload may not be regarded as nlattr,
3908 * (like address or something else), calculate the remaining length
3909 * here to ease following length checks.
3910 */
3911 rlen = nlmsg_attrlen(nlh, sizeof(*ev));
3912
3913 switch (nlh->nlmsg_type) {
3914 case ISCSI_UEVENT_CREATE_SESSION:
3915 err = iscsi_if_create_session(priv, ep, ev,
3916 portid,
3917 ev->u.c_session.initial_cmdsn,
3918 ev->u.c_session.cmds_max,
3919 ev->u.c_session.queue_depth);
3920 break;
3921 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3922 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3923 if (!ep) {
3924 err = -EINVAL;
3925 break;
3926 }
3927
3928 err = iscsi_if_create_session(priv, ep, ev,
3929 portid,
3930 ev->u.c_bound_session.initial_cmdsn,
3931 ev->u.c_bound_session.cmds_max,
3932 ev->u.c_bound_session.queue_depth);
3933 iscsi_put_endpoint(ep);
3934 break;
3935 case ISCSI_UEVENT_DESTROY_SESSION:
3936 session = iscsi_session_lookup(ev->u.d_session.sid);
3937 if (!session)
3938 err = -EINVAL;
3939 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3940 err = -EBUSY;
3941 else
3942 transport->destroy_session(session);
3943 break;
3944 case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3945 session = iscsi_session_lookup(ev->u.d_session.sid);
3946 if (!session)
3947 err = -EINVAL;
3948 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3949 err = -EBUSY;
3950 else {
3951 unsigned long flags;
3952
3953 /* Prevent this session from being found again */
3954 spin_lock_irqsave(&sesslock, flags);
3955 list_del_init(&session->sess_list);
3956 spin_unlock_irqrestore(&sesslock, flags);
3957
3958 queue_work(system_unbound_wq, &session->destroy_work);
3959 }
3960 break;
3961 case ISCSI_UEVENT_UNBIND_SESSION:
3962 session = iscsi_session_lookup(ev->u.d_session.sid);
3963 if (session)
3964 scsi_queue_work(iscsi_session_to_shost(session),
3965 &session->unbind_work);
3966 else
3967 err = -EINVAL;
3968 break;
3969 case ISCSI_UEVENT_SET_PARAM:
3970 err = iscsi_if_set_param(transport, ev, rlen);
3971 break;
3972 case ISCSI_UEVENT_CREATE_CONN:
3973 case ISCSI_UEVENT_DESTROY_CONN:
3974 case ISCSI_UEVENT_STOP_CONN:
3975 case ISCSI_UEVENT_START_CONN:
3976 case ISCSI_UEVENT_BIND_CONN:
3977 case ISCSI_UEVENT_SEND_PDU:
3978 err = iscsi_if_transport_conn(transport, nlh, rlen);
3979 break;
3980 case ISCSI_UEVENT_GET_STATS:
3981 err = iscsi_if_get_stats(transport, nlh);
3982 break;
3983 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3984 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3985 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3986 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3987 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type, rlen);
3988 break;
3989 case ISCSI_UEVENT_TGT_DSCVR:
3990 err = iscsi_tgt_dscvr(transport, ev, rlen);
3991 break;
3992 case ISCSI_UEVENT_SET_HOST_PARAM:
3993 err = iscsi_set_host_param(transport, ev, rlen);
3994 break;
3995 case ISCSI_UEVENT_PATH_UPDATE:
3996 err = iscsi_set_path(transport, ev, rlen);
3997 break;
3998 case ISCSI_UEVENT_SET_IFACE_PARAMS:
3999 err = iscsi_set_iface_params(transport, ev, rlen);
4000 break;
4001 case ISCSI_UEVENT_PING:
4002 err = iscsi_send_ping(transport, ev, rlen);
4003 break;
4004 case ISCSI_UEVENT_GET_CHAP:
4005 err = iscsi_get_chap(transport, nlh);
4006 break;
4007 case ISCSI_UEVENT_DELETE_CHAP:
4008 err = iscsi_delete_chap(transport, ev);
4009 break;
4010 case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
4011 err = iscsi_set_flashnode_param(transport, ev, rlen);
4012 break;
4013 case ISCSI_UEVENT_NEW_FLASHNODE:
4014 err = iscsi_new_flashnode(transport, ev, rlen);
4015 break;
4016 case ISCSI_UEVENT_DEL_FLASHNODE:
4017 err = iscsi_del_flashnode(transport, ev);
4018 break;
4019 case ISCSI_UEVENT_LOGIN_FLASHNODE:
4020 err = iscsi_login_flashnode(transport, ev);
4021 break;
4022 case ISCSI_UEVENT_LOGOUT_FLASHNODE:
4023 err = iscsi_logout_flashnode(transport, ev);
4024 break;
4025 case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
4026 err = iscsi_logout_flashnode_sid(transport, ev);
4027 break;
4028 case ISCSI_UEVENT_SET_CHAP:
4029 err = iscsi_set_chap(transport, ev, rlen);
4030 break;
4031 case ISCSI_UEVENT_GET_HOST_STATS:
4032 err = iscsi_get_host_stats(transport, nlh);
4033 break;
4034 default:
4035 err = -ENOSYS;
4036 break;
4037 }
4038
4039 module_put(transport->owner);
4040 return err;
4041 }
4042
4043 /*
4044 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
4045 * Malformed skbs with wrong lengths or invalid creds are not processed.
4046 */
4047 static void
iscsi_if_rx(struct sk_buff * skb)4048 iscsi_if_rx(struct sk_buff *skb)
4049 {
4050 u32 portid = NETLINK_CB(skb).portid;
4051
4052 mutex_lock(&rx_queue_mutex);
4053 while (skb->len >= NLMSG_HDRLEN) {
4054 int err;
4055 uint32_t rlen;
4056 struct nlmsghdr *nlh;
4057 struct iscsi_uevent *ev;
4058 uint32_t group;
4059 int retries = ISCSI_SEND_MAX_ALLOWED;
4060
4061 nlh = nlmsg_hdr(skb);
4062 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4063 skb->len < nlh->nlmsg_len) {
4064 break;
4065 }
4066
4067 ev = nlmsg_data(nlh);
4068 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4069 if (rlen > skb->len)
4070 rlen = skb->len;
4071
4072 err = iscsi_if_recv_msg(skb, nlh, &group);
4073 if (err) {
4074 ev->type = ISCSI_KEVENT_IF_ERROR;
4075 ev->iferror = err;
4076 }
4077 do {
4078 /*
4079 * special case for GET_STATS:
4080 * on success - sending reply and stats from
4081 * inside of if_recv_msg(),
4082 * on error - fall through.
4083 */
4084 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4085 break;
4086 if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4087 break;
4088 err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4089 ev, sizeof(*ev));
4090 if (err == -EAGAIN && --retries < 0) {
4091 printk(KERN_WARNING "Send reply failed, error %d\n", err);
4092 break;
4093 }
4094 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4095 skb_pull(skb, rlen);
4096 }
4097 mutex_unlock(&rx_queue_mutex);
4098 }
4099
4100 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
4101 struct device_attribute dev_attr_##_prefix##_##_name = \
4102 __ATTR(_name,_mode,_show,_store)
4103
4104 /*
4105 * iSCSI connection attrs
4106 */
4107 #define iscsi_conn_attr_show(param) \
4108 static ssize_t \
4109 show_conn_param_##param(struct device *dev, \
4110 struct device_attribute *attr, char *buf) \
4111 { \
4112 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
4113 struct iscsi_transport *t = conn->transport; \
4114 return t->get_conn_param(conn, param, buf); \
4115 }
4116
4117 #define iscsi_conn_attr(field, param) \
4118 iscsi_conn_attr_show(param) \
4119 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
4120 NULL);
4121
4122 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4123 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4124 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4125 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4126 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4127 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4128 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4129 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4130 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4131 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4132 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4133 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4134 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4135 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4136 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4137 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4138 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4139 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4140 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4141 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4142 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4143 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4144 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4145 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4146 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4147 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4148 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4149 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4150
4151 static const char *const connection_state_names[] = {
4152 [ISCSI_CONN_UP] = "up",
4153 [ISCSI_CONN_DOWN] = "down",
4154 [ISCSI_CONN_FAILED] = "failed",
4155 [ISCSI_CONN_BOUND] = "bound"
4156 };
4157
show_conn_state(struct device * dev,struct device_attribute * attr,char * buf)4158 static ssize_t show_conn_state(struct device *dev,
4159 struct device_attribute *attr, char *buf)
4160 {
4161 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4162 const char *state = "unknown";
4163 int conn_state = READ_ONCE(conn->state);
4164
4165 if (conn_state >= 0 &&
4166 conn_state < ARRAY_SIZE(connection_state_names))
4167 state = connection_state_names[conn_state];
4168
4169 return sysfs_emit(buf, "%s\n", state);
4170 }
4171 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4172 NULL);
4173
4174 #define iscsi_conn_ep_attr_show(param) \
4175 static ssize_t show_conn_ep_param_##param(struct device *dev, \
4176 struct device_attribute *attr,\
4177 char *buf) \
4178 { \
4179 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
4180 struct iscsi_transport *t = conn->transport; \
4181 struct iscsi_endpoint *ep; \
4182 ssize_t rc; \
4183 \
4184 /* \
4185 * Need to make sure ep_disconnect does not free the LLD's \
4186 * interconnect resources while we are trying to read them. \
4187 */ \
4188 mutex_lock(&conn->ep_mutex); \
4189 ep = conn->ep; \
4190 if (!ep && t->ep_connect) { \
4191 mutex_unlock(&conn->ep_mutex); \
4192 return -ENOTCONN; \
4193 } \
4194 \
4195 if (ep) \
4196 rc = t->get_ep_param(ep, param, buf); \
4197 else \
4198 rc = t->get_conn_param(conn, param, buf); \
4199 mutex_unlock(&conn->ep_mutex); \
4200 return rc; \
4201 }
4202
4203 #define iscsi_conn_ep_attr(field, param) \
4204 iscsi_conn_ep_attr_show(param) \
4205 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
4206 show_conn_ep_param_##param, NULL);
4207
4208 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4209 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4210
4211 static struct attribute *iscsi_conn_attrs[] = {
4212 &dev_attr_conn_max_recv_dlength.attr,
4213 &dev_attr_conn_max_xmit_dlength.attr,
4214 &dev_attr_conn_header_digest.attr,
4215 &dev_attr_conn_data_digest.attr,
4216 &dev_attr_conn_ifmarker.attr,
4217 &dev_attr_conn_ofmarker.attr,
4218 &dev_attr_conn_address.attr,
4219 &dev_attr_conn_port.attr,
4220 &dev_attr_conn_exp_statsn.attr,
4221 &dev_attr_conn_persistent_address.attr,
4222 &dev_attr_conn_persistent_port.attr,
4223 &dev_attr_conn_ping_tmo.attr,
4224 &dev_attr_conn_recv_tmo.attr,
4225 &dev_attr_conn_local_port.attr,
4226 &dev_attr_conn_statsn.attr,
4227 &dev_attr_conn_keepalive_tmo.attr,
4228 &dev_attr_conn_max_segment_size.attr,
4229 &dev_attr_conn_tcp_timestamp_stat.attr,
4230 &dev_attr_conn_tcp_wsf_disable.attr,
4231 &dev_attr_conn_tcp_nagle_disable.attr,
4232 &dev_attr_conn_tcp_timer_scale.attr,
4233 &dev_attr_conn_tcp_timestamp_enable.attr,
4234 &dev_attr_conn_fragment_disable.attr,
4235 &dev_attr_conn_ipv4_tos.attr,
4236 &dev_attr_conn_ipv6_traffic_class.attr,
4237 &dev_attr_conn_ipv6_flow_label.attr,
4238 &dev_attr_conn_is_fw_assigned_ipv6.attr,
4239 &dev_attr_conn_tcp_xmit_wsf.attr,
4240 &dev_attr_conn_tcp_recv_wsf.attr,
4241 &dev_attr_conn_local_ipaddr.attr,
4242 &dev_attr_conn_state.attr,
4243 NULL,
4244 };
4245
iscsi_conn_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4246 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4247 struct attribute *attr, int i)
4248 {
4249 struct device *cdev = container_of(kobj, struct device, kobj);
4250 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4251 struct iscsi_transport *t = conn->transport;
4252 int param;
4253
4254 if (attr == &dev_attr_conn_max_recv_dlength.attr)
4255 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4256 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4257 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4258 else if (attr == &dev_attr_conn_header_digest.attr)
4259 param = ISCSI_PARAM_HDRDGST_EN;
4260 else if (attr == &dev_attr_conn_data_digest.attr)
4261 param = ISCSI_PARAM_DATADGST_EN;
4262 else if (attr == &dev_attr_conn_ifmarker.attr)
4263 param = ISCSI_PARAM_IFMARKER_EN;
4264 else if (attr == &dev_attr_conn_ofmarker.attr)
4265 param = ISCSI_PARAM_OFMARKER_EN;
4266 else if (attr == &dev_attr_conn_address.attr)
4267 param = ISCSI_PARAM_CONN_ADDRESS;
4268 else if (attr == &dev_attr_conn_port.attr)
4269 param = ISCSI_PARAM_CONN_PORT;
4270 else if (attr == &dev_attr_conn_exp_statsn.attr)
4271 param = ISCSI_PARAM_EXP_STATSN;
4272 else if (attr == &dev_attr_conn_persistent_address.attr)
4273 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4274 else if (attr == &dev_attr_conn_persistent_port.attr)
4275 param = ISCSI_PARAM_PERSISTENT_PORT;
4276 else if (attr == &dev_attr_conn_ping_tmo.attr)
4277 param = ISCSI_PARAM_PING_TMO;
4278 else if (attr == &dev_attr_conn_recv_tmo.attr)
4279 param = ISCSI_PARAM_RECV_TMO;
4280 else if (attr == &dev_attr_conn_local_port.attr)
4281 param = ISCSI_PARAM_LOCAL_PORT;
4282 else if (attr == &dev_attr_conn_statsn.attr)
4283 param = ISCSI_PARAM_STATSN;
4284 else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4285 param = ISCSI_PARAM_KEEPALIVE_TMO;
4286 else if (attr == &dev_attr_conn_max_segment_size.attr)
4287 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4288 else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4289 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4290 else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4291 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4292 else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4293 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4294 else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4295 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4296 else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4297 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4298 else if (attr == &dev_attr_conn_fragment_disable.attr)
4299 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4300 else if (attr == &dev_attr_conn_ipv4_tos.attr)
4301 param = ISCSI_PARAM_IPV4_TOS;
4302 else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4303 param = ISCSI_PARAM_IPV6_TC;
4304 else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4305 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4306 else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4307 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4308 else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4309 param = ISCSI_PARAM_TCP_XMIT_WSF;
4310 else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4311 param = ISCSI_PARAM_TCP_RECV_WSF;
4312 else if (attr == &dev_attr_conn_local_ipaddr.attr)
4313 param = ISCSI_PARAM_LOCAL_IPADDR;
4314 else if (attr == &dev_attr_conn_state.attr)
4315 return S_IRUGO;
4316 else {
4317 WARN_ONCE(1, "Invalid conn attr");
4318 return 0;
4319 }
4320
4321 return t->attr_is_visible(ISCSI_PARAM, param);
4322 }
4323
4324 static struct attribute_group iscsi_conn_group = {
4325 .attrs = iscsi_conn_attrs,
4326 .is_visible = iscsi_conn_attr_is_visible,
4327 };
4328
4329 /*
4330 * iSCSI session attrs
4331 */
4332 #define iscsi_session_attr_show(param, perm) \
4333 static ssize_t \
4334 show_session_param_##param(struct device *dev, \
4335 struct device_attribute *attr, char *buf) \
4336 { \
4337 struct iscsi_cls_session *session = \
4338 iscsi_dev_to_session(dev->parent); \
4339 struct iscsi_transport *t = session->transport; \
4340 \
4341 if (perm && !capable(CAP_SYS_ADMIN)) \
4342 return -EACCES; \
4343 return t->get_session_param(session, param, buf); \
4344 }
4345
4346 #define iscsi_session_attr(field, param, perm) \
4347 iscsi_session_attr_show(param, perm) \
4348 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4349 NULL);
4350 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4351 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4352 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4353 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4354 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4355 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4356 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4357 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4358 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4359 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4360 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4361 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4362 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4363 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4364 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4365 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4366 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4367 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4368 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4369 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4370 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4371 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4372 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4373 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4374 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4375 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4376 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4377 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4378 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4379 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4380 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4381 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4382 iscsi_session_attr(discovery_auth_optional,
4383 ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4384 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4385 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4386 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4387 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4388 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4389 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4390 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4391
4392 static ssize_t
show_priv_session_target_state(struct device * dev,struct device_attribute * attr,char * buf)4393 show_priv_session_target_state(struct device *dev, struct device_attribute *attr,
4394 char *buf)
4395 {
4396 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4397
4398 return sysfs_emit(buf, "%s\n",
4399 iscsi_session_target_state_name[session->target_state]);
4400 }
4401
4402 static ISCSI_CLASS_ATTR(priv_sess, target_state, S_IRUGO,
4403 show_priv_session_target_state, NULL);
4404
4405 static ssize_t
show_priv_session_state(struct device * dev,struct device_attribute * attr,char * buf)4406 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4407 char *buf)
4408 {
4409 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4410 return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4411 }
4412 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4413 NULL);
4414 static ssize_t
show_priv_session_creator(struct device * dev,struct device_attribute * attr,char * buf)4415 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4416 char *buf)
4417 {
4418 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4419 return sysfs_emit(buf, "%d\n", session->creator);
4420 }
4421 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4422 NULL);
4423 static ssize_t
show_priv_session_target_id(struct device * dev,struct device_attribute * attr,char * buf)4424 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4425 char *buf)
4426 {
4427 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4428 return sysfs_emit(buf, "%d\n", session->target_id);
4429 }
4430 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4431 show_priv_session_target_id, NULL);
4432
4433 #define iscsi_priv_session_attr_show(field, format) \
4434 static ssize_t \
4435 show_priv_session_##field(struct device *dev, \
4436 struct device_attribute *attr, char *buf) \
4437 { \
4438 struct iscsi_cls_session *session = \
4439 iscsi_dev_to_session(dev->parent); \
4440 if (session->field == -1) \
4441 return sysfs_emit(buf, "off\n"); \
4442 return sysfs_emit(buf, format"\n", session->field); \
4443 }
4444
4445 #define iscsi_priv_session_attr_store(field) \
4446 static ssize_t \
4447 store_priv_session_##field(struct device *dev, \
4448 struct device_attribute *attr, \
4449 const char *buf, size_t count) \
4450 { \
4451 int val; \
4452 char *cp; \
4453 struct iscsi_cls_session *session = \
4454 iscsi_dev_to_session(dev->parent); \
4455 if ((session->state == ISCSI_SESSION_FREE) || \
4456 (session->state == ISCSI_SESSION_FAILED)) \
4457 return -EBUSY; \
4458 if (strncmp(buf, "off", 3) == 0) { \
4459 session->field = -1; \
4460 session->field##_sysfs_override = true; \
4461 } else { \
4462 val = simple_strtoul(buf, &cp, 0); \
4463 if (*cp != '\0' && *cp != '\n') \
4464 return -EINVAL; \
4465 session->field = val; \
4466 session->field##_sysfs_override = true; \
4467 } \
4468 return count; \
4469 }
4470
4471 #define iscsi_priv_session_rw_attr(field, format) \
4472 iscsi_priv_session_attr_show(field, format) \
4473 iscsi_priv_session_attr_store(field) \
4474 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
4475 show_priv_session_##field, \
4476 store_priv_session_##field)
4477
4478 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4479
4480 static struct attribute *iscsi_session_attrs[] = {
4481 &dev_attr_sess_initial_r2t.attr,
4482 &dev_attr_sess_max_outstanding_r2t.attr,
4483 &dev_attr_sess_immediate_data.attr,
4484 &dev_attr_sess_first_burst_len.attr,
4485 &dev_attr_sess_max_burst_len.attr,
4486 &dev_attr_sess_data_pdu_in_order.attr,
4487 &dev_attr_sess_data_seq_in_order.attr,
4488 &dev_attr_sess_erl.attr,
4489 &dev_attr_sess_targetname.attr,
4490 &dev_attr_sess_tpgt.attr,
4491 &dev_attr_sess_password.attr,
4492 &dev_attr_sess_password_in.attr,
4493 &dev_attr_sess_username.attr,
4494 &dev_attr_sess_username_in.attr,
4495 &dev_attr_sess_fast_abort.attr,
4496 &dev_attr_sess_abort_tmo.attr,
4497 &dev_attr_sess_lu_reset_tmo.attr,
4498 &dev_attr_sess_tgt_reset_tmo.attr,
4499 &dev_attr_sess_ifacename.attr,
4500 &dev_attr_sess_initiatorname.attr,
4501 &dev_attr_sess_targetalias.attr,
4502 &dev_attr_sess_boot_root.attr,
4503 &dev_attr_sess_boot_nic.attr,
4504 &dev_attr_sess_boot_target.attr,
4505 &dev_attr_priv_sess_recovery_tmo.attr,
4506 &dev_attr_priv_sess_state.attr,
4507 &dev_attr_priv_sess_target_state.attr,
4508 &dev_attr_priv_sess_creator.attr,
4509 &dev_attr_sess_chap_out_idx.attr,
4510 &dev_attr_sess_chap_in_idx.attr,
4511 &dev_attr_priv_sess_target_id.attr,
4512 &dev_attr_sess_auto_snd_tgt_disable.attr,
4513 &dev_attr_sess_discovery_session.attr,
4514 &dev_attr_sess_portal_type.attr,
4515 &dev_attr_sess_chap_auth.attr,
4516 &dev_attr_sess_discovery_logout.attr,
4517 &dev_attr_sess_bidi_chap.attr,
4518 &dev_attr_sess_discovery_auth_optional.attr,
4519 &dev_attr_sess_def_time2wait.attr,
4520 &dev_attr_sess_def_time2retain.attr,
4521 &dev_attr_sess_isid.attr,
4522 &dev_attr_sess_tsid.attr,
4523 &dev_attr_sess_def_taskmgmt_tmo.attr,
4524 &dev_attr_sess_discovery_parent_idx.attr,
4525 &dev_attr_sess_discovery_parent_type.attr,
4526 NULL,
4527 };
4528
iscsi_session_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4529 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4530 struct attribute *attr, int i)
4531 {
4532 struct device *cdev = container_of(kobj, struct device, kobj);
4533 struct iscsi_cls_session *session = transport_class_to_session(cdev);
4534 struct iscsi_transport *t = session->transport;
4535 int param;
4536
4537 if (attr == &dev_attr_sess_initial_r2t.attr)
4538 param = ISCSI_PARAM_INITIAL_R2T_EN;
4539 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4540 param = ISCSI_PARAM_MAX_R2T;
4541 else if (attr == &dev_attr_sess_immediate_data.attr)
4542 param = ISCSI_PARAM_IMM_DATA_EN;
4543 else if (attr == &dev_attr_sess_first_burst_len.attr)
4544 param = ISCSI_PARAM_FIRST_BURST;
4545 else if (attr == &dev_attr_sess_max_burst_len.attr)
4546 param = ISCSI_PARAM_MAX_BURST;
4547 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4548 param = ISCSI_PARAM_PDU_INORDER_EN;
4549 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4550 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4551 else if (attr == &dev_attr_sess_erl.attr)
4552 param = ISCSI_PARAM_ERL;
4553 else if (attr == &dev_attr_sess_targetname.attr)
4554 param = ISCSI_PARAM_TARGET_NAME;
4555 else if (attr == &dev_attr_sess_tpgt.attr)
4556 param = ISCSI_PARAM_TPGT;
4557 else if (attr == &dev_attr_sess_chap_in_idx.attr)
4558 param = ISCSI_PARAM_CHAP_IN_IDX;
4559 else if (attr == &dev_attr_sess_chap_out_idx.attr)
4560 param = ISCSI_PARAM_CHAP_OUT_IDX;
4561 else if (attr == &dev_attr_sess_password.attr)
4562 param = ISCSI_PARAM_USERNAME;
4563 else if (attr == &dev_attr_sess_password_in.attr)
4564 param = ISCSI_PARAM_USERNAME_IN;
4565 else if (attr == &dev_attr_sess_username.attr)
4566 param = ISCSI_PARAM_PASSWORD;
4567 else if (attr == &dev_attr_sess_username_in.attr)
4568 param = ISCSI_PARAM_PASSWORD_IN;
4569 else if (attr == &dev_attr_sess_fast_abort.attr)
4570 param = ISCSI_PARAM_FAST_ABORT;
4571 else if (attr == &dev_attr_sess_abort_tmo.attr)
4572 param = ISCSI_PARAM_ABORT_TMO;
4573 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4574 param = ISCSI_PARAM_LU_RESET_TMO;
4575 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4576 param = ISCSI_PARAM_TGT_RESET_TMO;
4577 else if (attr == &dev_attr_sess_ifacename.attr)
4578 param = ISCSI_PARAM_IFACE_NAME;
4579 else if (attr == &dev_attr_sess_initiatorname.attr)
4580 param = ISCSI_PARAM_INITIATOR_NAME;
4581 else if (attr == &dev_attr_sess_targetalias.attr)
4582 param = ISCSI_PARAM_TARGET_ALIAS;
4583 else if (attr == &dev_attr_sess_boot_root.attr)
4584 param = ISCSI_PARAM_BOOT_ROOT;
4585 else if (attr == &dev_attr_sess_boot_nic.attr)
4586 param = ISCSI_PARAM_BOOT_NIC;
4587 else if (attr == &dev_attr_sess_boot_target.attr)
4588 param = ISCSI_PARAM_BOOT_TARGET;
4589 else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4590 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4591 else if (attr == &dev_attr_sess_discovery_session.attr)
4592 param = ISCSI_PARAM_DISCOVERY_SESS;
4593 else if (attr == &dev_attr_sess_portal_type.attr)
4594 param = ISCSI_PARAM_PORTAL_TYPE;
4595 else if (attr == &dev_attr_sess_chap_auth.attr)
4596 param = ISCSI_PARAM_CHAP_AUTH_EN;
4597 else if (attr == &dev_attr_sess_discovery_logout.attr)
4598 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4599 else if (attr == &dev_attr_sess_bidi_chap.attr)
4600 param = ISCSI_PARAM_BIDI_CHAP_EN;
4601 else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4602 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4603 else if (attr == &dev_attr_sess_def_time2wait.attr)
4604 param = ISCSI_PARAM_DEF_TIME2WAIT;
4605 else if (attr == &dev_attr_sess_def_time2retain.attr)
4606 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4607 else if (attr == &dev_attr_sess_isid.attr)
4608 param = ISCSI_PARAM_ISID;
4609 else if (attr == &dev_attr_sess_tsid.attr)
4610 param = ISCSI_PARAM_TSID;
4611 else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4612 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4613 else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4614 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4615 else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4616 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4617 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4618 return S_IRUGO | S_IWUSR;
4619 else if (attr == &dev_attr_priv_sess_state.attr)
4620 return S_IRUGO;
4621 else if (attr == &dev_attr_priv_sess_target_state.attr)
4622 return S_IRUGO;
4623 else if (attr == &dev_attr_priv_sess_creator.attr)
4624 return S_IRUGO;
4625 else if (attr == &dev_attr_priv_sess_target_id.attr)
4626 return S_IRUGO;
4627 else {
4628 WARN_ONCE(1, "Invalid session attr");
4629 return 0;
4630 }
4631
4632 return t->attr_is_visible(ISCSI_PARAM, param);
4633 }
4634
4635 static struct attribute_group iscsi_session_group = {
4636 .attrs = iscsi_session_attrs,
4637 .is_visible = iscsi_session_attr_is_visible,
4638 };
4639
4640 /*
4641 * iSCSI host attrs
4642 */
4643 #define iscsi_host_attr_show(param) \
4644 static ssize_t \
4645 show_host_param_##param(struct device *dev, \
4646 struct device_attribute *attr, char *buf) \
4647 { \
4648 struct Scsi_Host *shost = transport_class_to_shost(dev); \
4649 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4650 return priv->iscsi_transport->get_host_param(shost, param, buf); \
4651 }
4652
4653 #define iscsi_host_attr(field, param) \
4654 iscsi_host_attr_show(param) \
4655 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
4656 NULL);
4657
4658 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4659 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4660 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4661 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4662 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4663 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4664
4665 static struct attribute *iscsi_host_attrs[] = {
4666 &dev_attr_host_netdev.attr,
4667 &dev_attr_host_hwaddress.attr,
4668 &dev_attr_host_ipaddress.attr,
4669 &dev_attr_host_initiatorname.attr,
4670 &dev_attr_host_port_state.attr,
4671 &dev_attr_host_port_speed.attr,
4672 NULL,
4673 };
4674
iscsi_host_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4675 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4676 struct attribute *attr, int i)
4677 {
4678 struct device *cdev = container_of(kobj, struct device, kobj);
4679 struct Scsi_Host *shost = transport_class_to_shost(cdev);
4680 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4681 int param;
4682
4683 if (attr == &dev_attr_host_netdev.attr)
4684 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4685 else if (attr == &dev_attr_host_hwaddress.attr)
4686 param = ISCSI_HOST_PARAM_HWADDRESS;
4687 else if (attr == &dev_attr_host_ipaddress.attr)
4688 param = ISCSI_HOST_PARAM_IPADDRESS;
4689 else if (attr == &dev_attr_host_initiatorname.attr)
4690 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4691 else if (attr == &dev_attr_host_port_state.attr)
4692 param = ISCSI_HOST_PARAM_PORT_STATE;
4693 else if (attr == &dev_attr_host_port_speed.attr)
4694 param = ISCSI_HOST_PARAM_PORT_SPEED;
4695 else {
4696 WARN_ONCE(1, "Invalid host attr");
4697 return 0;
4698 }
4699
4700 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4701 }
4702
4703 static struct attribute_group iscsi_host_group = {
4704 .attrs = iscsi_host_attrs,
4705 .is_visible = iscsi_host_attr_is_visible,
4706 };
4707
4708 /* convert iscsi_port_speed values to ascii string name */
4709 static const struct {
4710 enum iscsi_port_speed value;
4711 char *name;
4712 } iscsi_port_speed_names[] = {
4713 {ISCSI_PORT_SPEED_UNKNOWN, "Unknown" },
4714 {ISCSI_PORT_SPEED_10MBPS, "10 Mbps" },
4715 {ISCSI_PORT_SPEED_100MBPS, "100 Mbps" },
4716 {ISCSI_PORT_SPEED_1GBPS, "1 Gbps" },
4717 {ISCSI_PORT_SPEED_10GBPS, "10 Gbps" },
4718 {ISCSI_PORT_SPEED_25GBPS, "25 Gbps" },
4719 {ISCSI_PORT_SPEED_40GBPS, "40 Gbps" },
4720 };
4721
iscsi_get_port_speed_name(struct Scsi_Host * shost)4722 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4723 {
4724 int i;
4725 char *speed = "Unknown!";
4726 struct iscsi_cls_host *ihost = shost->shost_data;
4727 uint32_t port_speed = ihost->port_speed;
4728
4729 for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4730 if (iscsi_port_speed_names[i].value & port_speed) {
4731 speed = iscsi_port_speed_names[i].name;
4732 break;
4733 }
4734 }
4735 return speed;
4736 }
4737 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4738
4739 /* convert iscsi_port_state values to ascii string name */
4740 static const struct {
4741 enum iscsi_port_state value;
4742 char *name;
4743 } iscsi_port_state_names[] = {
4744 {ISCSI_PORT_STATE_DOWN, "LINK DOWN" },
4745 {ISCSI_PORT_STATE_UP, "LINK UP" },
4746 };
4747
iscsi_get_port_state_name(struct Scsi_Host * shost)4748 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4749 {
4750 int i;
4751 char *state = "Unknown!";
4752 struct iscsi_cls_host *ihost = shost->shost_data;
4753 uint32_t port_state = ihost->port_state;
4754
4755 for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4756 if (iscsi_port_state_names[i].value & port_state) {
4757 state = iscsi_port_state_names[i].name;
4758 break;
4759 }
4760 }
4761 return state;
4762 }
4763 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4764
iscsi_session_match(struct attribute_container * cont,struct device * dev)4765 static int iscsi_session_match(struct attribute_container *cont,
4766 struct device *dev)
4767 {
4768 struct iscsi_cls_session *session;
4769 struct Scsi_Host *shost;
4770 struct iscsi_internal *priv;
4771
4772 if (!iscsi_is_session_dev(dev))
4773 return 0;
4774
4775 session = iscsi_dev_to_session(dev);
4776 shost = iscsi_session_to_shost(session);
4777 if (!shost->transportt)
4778 return 0;
4779
4780 priv = to_iscsi_internal(shost->transportt);
4781 if (priv->session_cont.ac.class != &iscsi_session_class.class)
4782 return 0;
4783
4784 return &priv->session_cont.ac == cont;
4785 }
4786
iscsi_conn_match(struct attribute_container * cont,struct device * dev)4787 static int iscsi_conn_match(struct attribute_container *cont,
4788 struct device *dev)
4789 {
4790 struct iscsi_cls_session *session;
4791 struct iscsi_cls_conn *conn;
4792 struct Scsi_Host *shost;
4793 struct iscsi_internal *priv;
4794
4795 if (!iscsi_is_conn_dev(dev))
4796 return 0;
4797
4798 conn = iscsi_dev_to_conn(dev);
4799 session = iscsi_dev_to_session(conn->dev.parent);
4800 shost = iscsi_session_to_shost(session);
4801
4802 if (!shost->transportt)
4803 return 0;
4804
4805 priv = to_iscsi_internal(shost->transportt);
4806 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4807 return 0;
4808
4809 return &priv->conn_cont.ac == cont;
4810 }
4811
iscsi_host_match(struct attribute_container * cont,struct device * dev)4812 static int iscsi_host_match(struct attribute_container *cont,
4813 struct device *dev)
4814 {
4815 struct Scsi_Host *shost;
4816 struct iscsi_internal *priv;
4817
4818 if (!scsi_is_host_device(dev))
4819 return 0;
4820
4821 shost = dev_to_shost(dev);
4822 if (!shost->transportt ||
4823 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4824 return 0;
4825
4826 priv = to_iscsi_internal(shost->transportt);
4827 return &priv->t.host_attrs.ac == cont;
4828 }
4829
4830 struct scsi_transport_template *
iscsi_register_transport(struct iscsi_transport * tt)4831 iscsi_register_transport(struct iscsi_transport *tt)
4832 {
4833 struct iscsi_internal *priv;
4834 unsigned long flags;
4835 int err;
4836
4837 BUG_ON(!tt);
4838 WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4839
4840 priv = iscsi_if_transport_lookup(tt);
4841 if (priv)
4842 return NULL;
4843
4844 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4845 if (!priv)
4846 return NULL;
4847 INIT_LIST_HEAD(&priv->list);
4848 priv->iscsi_transport = tt;
4849 priv->t.user_scan = iscsi_user_scan;
4850 priv->t.create_work_queue = 1;
4851
4852 priv->dev.class = &iscsi_transport_class;
4853 dev_set_name(&priv->dev, "%s", tt->name);
4854 err = device_register(&priv->dev);
4855 if (err)
4856 goto free_priv;
4857
4858 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4859 if (err)
4860 goto unregister_dev;
4861
4862 /* host parameters */
4863 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4864 priv->t.host_attrs.ac.match = iscsi_host_match;
4865 priv->t.host_attrs.ac.grp = &iscsi_host_group;
4866 priv->t.host_size = sizeof(struct iscsi_cls_host);
4867 transport_container_register(&priv->t.host_attrs);
4868
4869 /* connection parameters */
4870 priv->conn_cont.ac.class = &iscsi_connection_class.class;
4871 priv->conn_cont.ac.match = iscsi_conn_match;
4872 priv->conn_cont.ac.grp = &iscsi_conn_group;
4873 transport_container_register(&priv->conn_cont);
4874
4875 /* session parameters */
4876 priv->session_cont.ac.class = &iscsi_session_class.class;
4877 priv->session_cont.ac.match = iscsi_session_match;
4878 priv->session_cont.ac.grp = &iscsi_session_group;
4879 transport_container_register(&priv->session_cont);
4880
4881 spin_lock_irqsave(&iscsi_transport_lock, flags);
4882 list_add(&priv->list, &iscsi_transports);
4883 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4884
4885 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4886 return &priv->t;
4887
4888 unregister_dev:
4889 device_unregister(&priv->dev);
4890 return NULL;
4891 free_priv:
4892 kfree(priv);
4893 return NULL;
4894 }
4895 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4896
iscsi_unregister_transport(struct iscsi_transport * tt)4897 int iscsi_unregister_transport(struct iscsi_transport *tt)
4898 {
4899 struct iscsi_internal *priv;
4900 unsigned long flags;
4901
4902 BUG_ON(!tt);
4903
4904 mutex_lock(&rx_queue_mutex);
4905
4906 priv = iscsi_if_transport_lookup(tt);
4907 BUG_ON (!priv);
4908
4909 spin_lock_irqsave(&iscsi_transport_lock, flags);
4910 list_del(&priv->list);
4911 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4912
4913 transport_container_unregister(&priv->conn_cont);
4914 transport_container_unregister(&priv->session_cont);
4915 transport_container_unregister(&priv->t.host_attrs);
4916
4917 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4918 device_unregister(&priv->dev);
4919 mutex_unlock(&rx_queue_mutex);
4920
4921 return 0;
4922 }
4923 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4924
iscsi_dbg_trace(void (* trace)(struct device * dev,struct va_format *),struct device * dev,const char * fmt,...)4925 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4926 struct device *dev, const char *fmt, ...)
4927 {
4928 struct va_format vaf;
4929 va_list args;
4930
4931 va_start(args, fmt);
4932 vaf.fmt = fmt;
4933 vaf.va = &args;
4934 trace(dev, &vaf);
4935 va_end(args);
4936 }
4937 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4938
iscsi_transport_init(void)4939 static __init int iscsi_transport_init(void)
4940 {
4941 int err;
4942 struct netlink_kernel_cfg cfg = {
4943 .groups = 1,
4944 .input = iscsi_if_rx,
4945 };
4946 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4947 ISCSI_TRANSPORT_VERSION);
4948
4949 atomic_set(&iscsi_session_nr, 0);
4950
4951 err = class_register(&iscsi_transport_class);
4952 if (err)
4953 return err;
4954
4955 err = class_register(&iscsi_endpoint_class);
4956 if (err)
4957 goto unregister_transport_class;
4958
4959 err = class_register(&iscsi_iface_class);
4960 if (err)
4961 goto unregister_endpoint_class;
4962
4963 err = transport_class_register(&iscsi_host_class);
4964 if (err)
4965 goto unregister_iface_class;
4966
4967 err = transport_class_register(&iscsi_connection_class);
4968 if (err)
4969 goto unregister_host_class;
4970
4971 err = transport_class_register(&iscsi_session_class);
4972 if (err)
4973 goto unregister_conn_class;
4974
4975 err = bus_register(&iscsi_flashnode_bus);
4976 if (err)
4977 goto unregister_session_class;
4978
4979 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4980 if (!nls) {
4981 err = -ENOBUFS;
4982 goto unregister_flashnode_bus;
4983 }
4984
4985 iscsi_eh_timer_workq = alloc_workqueue("%s",
4986 WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4987 1, "iscsi_eh");
4988 if (!iscsi_eh_timer_workq) {
4989 err = -ENOMEM;
4990 goto release_nls;
4991 }
4992
4993 iscsi_conn_cleanup_workq = alloc_workqueue("%s",
4994 WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
4995 "iscsi_conn_cleanup");
4996 if (!iscsi_conn_cleanup_workq) {
4997 err = -ENOMEM;
4998 goto destroy_wq;
4999 }
5000
5001 return 0;
5002
5003 destroy_wq:
5004 destroy_workqueue(iscsi_eh_timer_workq);
5005 release_nls:
5006 netlink_kernel_release(nls);
5007 unregister_flashnode_bus:
5008 bus_unregister(&iscsi_flashnode_bus);
5009 unregister_session_class:
5010 transport_class_unregister(&iscsi_session_class);
5011 unregister_conn_class:
5012 transport_class_unregister(&iscsi_connection_class);
5013 unregister_host_class:
5014 transport_class_unregister(&iscsi_host_class);
5015 unregister_iface_class:
5016 class_unregister(&iscsi_iface_class);
5017 unregister_endpoint_class:
5018 class_unregister(&iscsi_endpoint_class);
5019 unregister_transport_class:
5020 class_unregister(&iscsi_transport_class);
5021 return err;
5022 }
5023
iscsi_transport_exit(void)5024 static void __exit iscsi_transport_exit(void)
5025 {
5026 destroy_workqueue(iscsi_conn_cleanup_workq);
5027 destroy_workqueue(iscsi_eh_timer_workq);
5028 netlink_kernel_release(nls);
5029 bus_unregister(&iscsi_flashnode_bus);
5030 transport_class_unregister(&iscsi_connection_class);
5031 transport_class_unregister(&iscsi_session_class);
5032 transport_class_unregister(&iscsi_host_class);
5033 class_unregister(&iscsi_endpoint_class);
5034 class_unregister(&iscsi_iface_class);
5035 class_unregister(&iscsi_transport_class);
5036 }
5037
5038 module_init(iscsi_transport_init);
5039 module_exit(iscsi_transport_exit);
5040
5041 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
5042 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
5043 "Alex Aizman <itn780@yahoo.com>");
5044 MODULE_DESCRIPTION("iSCSI Transport Interface");
5045 MODULE_LICENSE("GPL");
5046 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
5047 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
5048