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