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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/target/tcm_fc/tfc_sess.c
2 * Copyright (c) 2010 Cisco Systems, Inc.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 /* XXX TBD some includes may be extraneous */
20 #include <linux/module.h>
21 #include <linux/moduleparam.h>
22 #include <linux/utsname.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/kthread.h>
26 #include <linux/types.h>
27 #include <linux/string.h>
28 #include <linux/configfs.h>
29 #include <linux/ctype.h>
30 #include <linux/hash.h>
31 #include <linux/rcupdate.h>
32 #include <linux/rculist.h>
33 #include <linux/kref.h>
34 #include <asm/unaligned.h>
35 #include <scsi/libfc.h>
37 #include <target/target_core_base.h>
38 #include <target/target_core_fabric.h>
39 #include <target/configfs_macros.h>
43 static void ft_sess_delete_all(struct ft_tport
*);
46 * Lookup or allocate target local port.
47 * Caller holds ft_lport_lock.
49 static struct ft_tport
*ft_tport_get(struct fc_lport
*lport
)
52 struct ft_tport
*tport
;
55 tport
= rcu_dereference_protected(lport
->prov
[FC_TYPE_FCP
],
56 lockdep_is_held(&ft_lport_lock
));
57 if (tport
&& tport
->tpg
)
60 tpg
= ft_lport_find_tpg(lport
);
70 tport
= kzalloc(sizeof(*tport
), GFP_KERNEL
);
77 for (i
= 0; i
< FT_SESS_HASH_SIZE
; i
++)
78 INIT_HLIST_HEAD(&tport
->hash
[i
]);
80 rcu_assign_pointer(lport
->prov
[FC_TYPE_FCP
], tport
);
85 * Delete a target local port.
86 * Caller holds ft_lport_lock.
88 static void ft_tport_delete(struct ft_tport
*tport
)
90 struct fc_lport
*lport
;
93 ft_sess_delete_all(tport
);
95 BUG_ON(tport
!= lport
->prov
[FC_TYPE_FCP
]);
96 RCU_INIT_POINTER(lport
->prov
[FC_TYPE_FCP
], NULL
);
103 kfree_rcu(tport
, rcu
);
108 * Called thru fc_lport_iterate().
110 void ft_lport_add(struct fc_lport
*lport
, void *arg
)
112 mutex_lock(&ft_lport_lock
);
114 mutex_unlock(&ft_lport_lock
);
119 * Called thru fc_lport_iterate().
121 void ft_lport_del(struct fc_lport
*lport
, void *arg
)
123 struct ft_tport
*tport
;
125 mutex_lock(&ft_lport_lock
);
126 tport
= lport
->prov
[FC_TYPE_FCP
];
128 ft_tport_delete(tport
);
129 mutex_unlock(&ft_lport_lock
);
133 * Notification of local port change from libfc.
134 * Create or delete local port and associated tport.
136 int ft_lport_notify(struct notifier_block
*nb
, unsigned long event
, void *arg
)
138 struct fc_lport
*lport
= arg
;
141 case FC_LPORT_EV_ADD
:
142 ft_lport_add(lport
, NULL
);
144 case FC_LPORT_EV_DEL
:
145 ft_lport_del(lport
, NULL
);
152 * Hash function for FC_IDs.
154 static u32
ft_sess_hash(u32 port_id
)
156 return hash_32(port_id
, FT_SESS_HASH_BITS
);
160 * Find session in local port.
161 * Sessions and hash lists are RCU-protected.
162 * A reference is taken which must be eventually freed.
164 static struct ft_sess
*ft_sess_get(struct fc_lport
*lport
, u32 port_id
)
166 struct ft_tport
*tport
;
167 struct hlist_head
*head
;
168 struct ft_sess
*sess
;
171 tport
= rcu_dereference(lport
->prov
[FC_TYPE_FCP
]);
175 head
= &tport
->hash
[ft_sess_hash(port_id
)];
176 hlist_for_each_entry_rcu(sess
, head
, hash
) {
177 if (sess
->port_id
== port_id
) {
178 kref_get(&sess
->kref
);
180 pr_debug("port_id %x found %p\n", port_id
, sess
);
186 pr_debug("port_id %x not found\n", port_id
);
191 * Allocate session and enter it in the hash for the local port.
192 * Caller holds ft_lport_lock.
194 static struct ft_sess
*ft_sess_create(struct ft_tport
*tport
, u32 port_id
,
195 struct ft_node_acl
*acl
)
197 struct ft_sess
*sess
;
198 struct hlist_head
*head
;
200 head
= &tport
->hash
[ft_sess_hash(port_id
)];
201 hlist_for_each_entry_rcu(sess
, head
, hash
)
202 if (sess
->port_id
== port_id
)
205 sess
= kzalloc(sizeof(*sess
), GFP_KERNEL
);
209 sess
->se_sess
= transport_init_session_tags(TCM_FC_DEFAULT_TAGS
,
210 sizeof(struct ft_cmd
),
212 if (IS_ERR(sess
->se_sess
)) {
216 sess
->se_sess
->se_node_acl
= &acl
->se_node_acl
;
218 sess
->port_id
= port_id
;
219 kref_init(&sess
->kref
); /* ref for table entry */
220 hlist_add_head_rcu(&sess
->hash
, head
);
223 pr_debug("port_id %x sess %p\n", port_id
, sess
);
225 transport_register_session(&tport
->tpg
->se_tpg
, &acl
->se_node_acl
,
226 sess
->se_sess
, sess
);
231 * Unhash the session.
232 * Caller holds ft_lport_lock.
234 static void ft_sess_unhash(struct ft_sess
*sess
)
236 struct ft_tport
*tport
= sess
->tport
;
238 hlist_del_rcu(&sess
->hash
);
239 BUG_ON(!tport
->sess_count
);
246 * Delete session from hash.
247 * Caller holds ft_lport_lock.
249 static struct ft_sess
*ft_sess_delete(struct ft_tport
*tport
, u32 port_id
)
251 struct hlist_head
*head
;
252 struct ft_sess
*sess
;
254 head
= &tport
->hash
[ft_sess_hash(port_id
)];
255 hlist_for_each_entry_rcu(sess
, head
, hash
) {
256 if (sess
->port_id
== port_id
) {
257 ft_sess_unhash(sess
);
265 * Delete all sessions from tport.
266 * Caller holds ft_lport_lock.
268 static void ft_sess_delete_all(struct ft_tport
*tport
)
270 struct hlist_head
*head
;
271 struct ft_sess
*sess
;
273 for (head
= tport
->hash
;
274 head
< &tport
->hash
[FT_SESS_HASH_SIZE
]; head
++) {
275 hlist_for_each_entry_rcu(sess
, head
, hash
) {
276 ft_sess_unhash(sess
);
277 transport_deregister_session_configfs(sess
->se_sess
);
278 ft_sess_put(sess
); /* release from table */
284 * TCM ops for sessions.
288 * Determine whether session is allowed to be shutdown in the current context.
289 * Returns non-zero if the session should be shutdown.
291 int ft_sess_shutdown(struct se_session
*se_sess
)
293 struct ft_sess
*sess
= se_sess
->fabric_sess_ptr
;
295 pr_debug("port_id %x\n", sess
->port_id
);
300 * Remove session and send PRLO.
301 * This is called when the ACL is being deleted or queue depth is changing.
303 void ft_sess_close(struct se_session
*se_sess
)
305 struct ft_sess
*sess
= se_sess
->fabric_sess_ptr
;
308 mutex_lock(&ft_lport_lock
);
309 port_id
= sess
->port_id
;
311 mutex_unlock(&ft_lport_lock
);
314 pr_debug("port_id %x\n", port_id
);
315 ft_sess_unhash(sess
);
316 mutex_unlock(&ft_lport_lock
);
317 transport_deregister_session_configfs(se_sess
);
319 /* XXX Send LOGO or PRLO */
320 synchronize_rcu(); /* let transport deregister happen */
323 u32
ft_sess_get_index(struct se_session
*se_sess
)
325 struct ft_sess
*sess
= se_sess
->fabric_sess_ptr
;
327 return sess
->port_id
; /* XXX TBD probably not what is needed */
330 u32
ft_sess_get_port_name(struct se_session
*se_sess
,
331 unsigned char *buf
, u32 len
)
333 struct ft_sess
*sess
= se_sess
->fabric_sess_ptr
;
335 return ft_format_wwn(buf
, len
, sess
->port_name
);
339 * libfc ops involving sessions.
342 static int ft_prli_locked(struct fc_rport_priv
*rdata
, u32 spp_len
,
343 const struct fc_els_spp
*rspp
, struct fc_els_spp
*spp
)
345 struct ft_tport
*tport
;
346 struct ft_sess
*sess
;
347 struct ft_node_acl
*acl
;
350 tport
= ft_tport_get(rdata
->local_port
);
352 goto not_target
; /* not a target for this local port */
354 acl
= ft_acl_get(tport
->tpg
, rdata
);
356 goto not_target
; /* no target for this remote */
361 if (rspp
->spp_flags
& (FC_SPP_OPA_VAL
| FC_SPP_RPA_VAL
))
362 return FC_SPP_RESP_NO_PA
;
365 * If both target and initiator bits are off, the SPP is invalid.
367 fcp_parm
= ntohl(rspp
->spp_params
);
368 if (!(fcp_parm
& (FCP_SPPF_INIT_FCN
| FCP_SPPF_TARG_FCN
)))
369 return FC_SPP_RESP_INVL
;
372 * Create session (image pair) only if requested by
373 * EST_IMG_PAIR flag and if the requestor is an initiator.
375 if (rspp
->spp_flags
& FC_SPP_EST_IMG_PAIR
) {
376 spp
->spp_flags
|= FC_SPP_EST_IMG_PAIR
;
377 if (!(fcp_parm
& FCP_SPPF_INIT_FCN
))
378 return FC_SPP_RESP_CONF
;
379 sess
= ft_sess_create(tport
, rdata
->ids
.port_id
, acl
);
381 return FC_SPP_RESP_RES
;
384 sess
->params
= fcp_parm
;
385 sess
->port_name
= rdata
->ids
.port_name
;
386 sess
->max_frame
= rdata
->maxframe_size
;
388 /* XXX TBD - clearing actions. unit attn, see 4.10 */
392 * OR in our service parameters with other provider (initiator), if any.
395 fcp_parm
= ntohl(spp
->spp_params
);
396 fcp_parm
&= ~FCP_SPPF_RETRY
;
397 spp
->spp_params
= htonl(fcp_parm
| FCP_SPPF_TARG_FCN
);
398 return FC_SPP_RESP_ACK
;
401 fcp_parm
= ntohl(spp
->spp_params
);
402 fcp_parm
&= ~FCP_SPPF_TARG_FCN
;
403 spp
->spp_params
= htonl(fcp_parm
);
408 * tcm_fcp_prli() - Handle incoming or outgoing PRLI for the FCP target
409 * @rdata: remote port private
410 * @spp_len: service parameter page length
411 * @rspp: received service parameter page (NULL for outgoing PRLI)
412 * @spp: response service parameter page
414 * Returns spp response code.
416 static int ft_prli(struct fc_rport_priv
*rdata
, u32 spp_len
,
417 const struct fc_els_spp
*rspp
, struct fc_els_spp
*spp
)
421 mutex_lock(&ft_lport_lock
);
422 ret
= ft_prli_locked(rdata
, spp_len
, rspp
, spp
);
423 mutex_unlock(&ft_lport_lock
);
424 pr_debug("port_id %x flags %x ret %x\n",
425 rdata
->ids
.port_id
, rspp
? rspp
->spp_flags
: 0, ret
);
429 static void ft_sess_free(struct kref
*kref
)
431 struct ft_sess
*sess
= container_of(kref
, struct ft_sess
, kref
);
433 transport_deregister_session(sess
->se_sess
);
434 kfree_rcu(sess
, rcu
);
437 void ft_sess_put(struct ft_sess
*sess
)
439 int sess_held
= atomic_read(&sess
->kref
.refcount
);
442 kref_put(&sess
->kref
, ft_sess_free
);
445 static void ft_prlo(struct fc_rport_priv
*rdata
)
447 struct ft_sess
*sess
;
448 struct ft_tport
*tport
;
450 mutex_lock(&ft_lport_lock
);
451 tport
= rcu_dereference_protected(rdata
->local_port
->prov
[FC_TYPE_FCP
],
452 lockdep_is_held(&ft_lport_lock
));
455 mutex_unlock(&ft_lport_lock
);
458 sess
= ft_sess_delete(tport
, rdata
->ids
.port_id
);
460 mutex_unlock(&ft_lport_lock
);
463 mutex_unlock(&ft_lport_lock
);
464 transport_deregister_session_configfs(sess
->se_sess
);
465 ft_sess_put(sess
); /* release from table */
467 /* XXX TBD - clearing actions. unit attn, see 4.10 */
471 * Handle incoming FCP request.
472 * Caller has verified that the frame is type FCP.
474 static void ft_recv(struct fc_lport
*lport
, struct fc_frame
*fp
)
476 struct ft_sess
*sess
;
477 u32 sid
= fc_frame_sid(fp
);
479 pr_debug("sid %x\n", sid
);
481 sess
= ft_sess_get(lport
, sid
);
483 pr_debug("sid %x sess lookup failed\n", sid
);
484 /* TBD XXX - if FCP_CMND, send PRLO */
488 ft_recv_req(sess
, fp
); /* must do ft_sess_put() */
492 * Provider ops for libfc.
494 struct fc4_prov ft_prov
= {
498 .module
= THIS_MODULE
,