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git.proxmox.com Git - mirror_ubuntu-eoan-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/scsi.h>
36 #include <scsi/scsi_host.h>
37 #include <scsi/scsi_device.h>
38 #include <scsi/scsi_cmnd.h>
39 #include <scsi/libfc.h>
41 #include <target/target_core_base.h>
42 #include <target/target_core_fabric.h>
43 #include <target/target_core_configfs.h>
44 #include <target/configfs_macros.h>
48 static void ft_sess_delete_all(struct ft_tport
*);
51 * Lookup or allocate target local port.
52 * Caller holds ft_lport_lock.
54 static struct ft_tport
*ft_tport_get(struct fc_lport
*lport
)
57 struct ft_tport
*tport
;
60 tport
= rcu_dereference_protected(lport
->prov
[FC_TYPE_FCP
],
61 lockdep_is_held(&ft_lport_lock
));
62 if (tport
&& tport
->tpg
)
65 tpg
= ft_lport_find_tpg(lport
);
75 tport
= kzalloc(sizeof(*tport
), GFP_KERNEL
);
82 for (i
= 0; i
< FT_SESS_HASH_SIZE
; i
++)
83 INIT_HLIST_HEAD(&tport
->hash
[i
]);
85 rcu_assign_pointer(lport
->prov
[FC_TYPE_FCP
], tport
);
90 * Delete a target local port.
91 * Caller holds ft_lport_lock.
93 static void ft_tport_delete(struct ft_tport
*tport
)
95 struct fc_lport
*lport
;
98 ft_sess_delete_all(tport
);
100 BUG_ON(tport
!= lport
->prov
[FC_TYPE_FCP
]);
101 RCU_INIT_POINTER(lport
->prov
[FC_TYPE_FCP
], NULL
);
108 kfree_rcu(tport
, rcu
);
113 * Called thru fc_lport_iterate().
115 void ft_lport_add(struct fc_lport
*lport
, void *arg
)
117 mutex_lock(&ft_lport_lock
);
119 mutex_unlock(&ft_lport_lock
);
124 * Called thru fc_lport_iterate().
126 void ft_lport_del(struct fc_lport
*lport
, void *arg
)
128 struct ft_tport
*tport
;
130 mutex_lock(&ft_lport_lock
);
131 tport
= lport
->prov
[FC_TYPE_FCP
];
133 ft_tport_delete(tport
);
134 mutex_unlock(&ft_lport_lock
);
138 * Notification of local port change from libfc.
139 * Create or delete local port and associated tport.
141 int ft_lport_notify(struct notifier_block
*nb
, unsigned long event
, void *arg
)
143 struct fc_lport
*lport
= arg
;
146 case FC_LPORT_EV_ADD
:
147 ft_lport_add(lport
, NULL
);
149 case FC_LPORT_EV_DEL
:
150 ft_lport_del(lport
, NULL
);
157 * Hash function for FC_IDs.
159 static u32
ft_sess_hash(u32 port_id
)
161 return hash_32(port_id
, FT_SESS_HASH_BITS
);
165 * Find session in local port.
166 * Sessions and hash lists are RCU-protected.
167 * A reference is taken which must be eventually freed.
169 static struct ft_sess
*ft_sess_get(struct fc_lport
*lport
, u32 port_id
)
171 struct ft_tport
*tport
;
172 struct hlist_head
*head
;
173 struct ft_sess
*sess
;
176 tport
= rcu_dereference(lport
->prov
[FC_TYPE_FCP
]);
180 head
= &tport
->hash
[ft_sess_hash(port_id
)];
181 hlist_for_each_entry_rcu(sess
, head
, hash
) {
182 if (sess
->port_id
== port_id
) {
183 kref_get(&sess
->kref
);
185 pr_debug("port_id %x found %p\n", port_id
, sess
);
191 pr_debug("port_id %x not found\n", port_id
);
196 * Allocate session and enter it in the hash for the local port.
197 * Caller holds ft_lport_lock.
199 static struct ft_sess
*ft_sess_create(struct ft_tport
*tport
, u32 port_id
,
200 struct ft_node_acl
*acl
)
202 struct ft_sess
*sess
;
203 struct hlist_head
*head
;
205 head
= &tport
->hash
[ft_sess_hash(port_id
)];
206 hlist_for_each_entry_rcu(sess
, head
, hash
)
207 if (sess
->port_id
== port_id
)
210 sess
= kzalloc(sizeof(*sess
), GFP_KERNEL
);
214 sess
->se_sess
= transport_init_session_tags(TCM_FC_DEFAULT_TAGS
,
215 sizeof(struct ft_cmd
),
217 if (IS_ERR(sess
->se_sess
)) {
221 sess
->se_sess
->se_node_acl
= &acl
->se_node_acl
;
223 sess
->port_id
= port_id
;
224 kref_init(&sess
->kref
); /* ref for table entry */
225 hlist_add_head_rcu(&sess
->hash
, head
);
228 pr_debug("port_id %x sess %p\n", port_id
, sess
);
230 transport_register_session(&tport
->tpg
->se_tpg
, &acl
->se_node_acl
,
231 sess
->se_sess
, sess
);
236 * Unhash the session.
237 * Caller holds ft_lport_lock.
239 static void ft_sess_unhash(struct ft_sess
*sess
)
241 struct ft_tport
*tport
= sess
->tport
;
243 hlist_del_rcu(&sess
->hash
);
244 BUG_ON(!tport
->sess_count
);
251 * Delete session from hash.
252 * Caller holds ft_lport_lock.
254 static struct ft_sess
*ft_sess_delete(struct ft_tport
*tport
, u32 port_id
)
256 struct hlist_head
*head
;
257 struct ft_sess
*sess
;
259 head
= &tport
->hash
[ft_sess_hash(port_id
)];
260 hlist_for_each_entry_rcu(sess
, head
, hash
) {
261 if (sess
->port_id
== port_id
) {
262 ft_sess_unhash(sess
);
270 * Delete all sessions from tport.
271 * Caller holds ft_lport_lock.
273 static void ft_sess_delete_all(struct ft_tport
*tport
)
275 struct hlist_head
*head
;
276 struct ft_sess
*sess
;
278 for (head
= tport
->hash
;
279 head
< &tport
->hash
[FT_SESS_HASH_SIZE
]; head
++) {
280 hlist_for_each_entry_rcu(sess
, head
, hash
) {
281 ft_sess_unhash(sess
);
282 transport_deregister_session_configfs(sess
->se_sess
);
283 ft_sess_put(sess
); /* release from table */
289 * TCM ops for sessions.
293 * Determine whether session is allowed to be shutdown in the current context.
294 * Returns non-zero if the session should be shutdown.
296 int ft_sess_shutdown(struct se_session
*se_sess
)
298 struct ft_sess
*sess
= se_sess
->fabric_sess_ptr
;
300 pr_debug("port_id %x\n", sess
->port_id
);
305 * Remove session and send PRLO.
306 * This is called when the ACL is being deleted or queue depth is changing.
308 void ft_sess_close(struct se_session
*se_sess
)
310 struct ft_sess
*sess
= se_sess
->fabric_sess_ptr
;
313 mutex_lock(&ft_lport_lock
);
314 port_id
= sess
->port_id
;
316 mutex_unlock(&ft_lport_lock
);
319 pr_debug("port_id %x\n", port_id
);
320 ft_sess_unhash(sess
);
321 mutex_unlock(&ft_lport_lock
);
322 transport_deregister_session_configfs(se_sess
);
324 /* XXX Send LOGO or PRLO */
325 synchronize_rcu(); /* let transport deregister happen */
328 u32
ft_sess_get_index(struct se_session
*se_sess
)
330 struct ft_sess
*sess
= se_sess
->fabric_sess_ptr
;
332 return sess
->port_id
; /* XXX TBD probably not what is needed */
335 u32
ft_sess_get_port_name(struct se_session
*se_sess
,
336 unsigned char *buf
, u32 len
)
338 struct ft_sess
*sess
= se_sess
->fabric_sess_ptr
;
340 return ft_format_wwn(buf
, len
, sess
->port_name
);
344 * libfc ops involving sessions.
347 static int ft_prli_locked(struct fc_rport_priv
*rdata
, u32 spp_len
,
348 const struct fc_els_spp
*rspp
, struct fc_els_spp
*spp
)
350 struct ft_tport
*tport
;
351 struct ft_sess
*sess
;
352 struct ft_node_acl
*acl
;
355 tport
= ft_tport_get(rdata
->local_port
);
357 goto not_target
; /* not a target for this local port */
359 acl
= ft_acl_get(tport
->tpg
, rdata
);
361 goto not_target
; /* no target for this remote */
366 if (rspp
->spp_flags
& (FC_SPP_OPA_VAL
| FC_SPP_RPA_VAL
))
367 return FC_SPP_RESP_NO_PA
;
370 * If both target and initiator bits are off, the SPP is invalid.
372 fcp_parm
= ntohl(rspp
->spp_params
);
373 if (!(fcp_parm
& (FCP_SPPF_INIT_FCN
| FCP_SPPF_TARG_FCN
)))
374 return FC_SPP_RESP_INVL
;
377 * Create session (image pair) only if requested by
378 * EST_IMG_PAIR flag and if the requestor is an initiator.
380 if (rspp
->spp_flags
& FC_SPP_EST_IMG_PAIR
) {
381 spp
->spp_flags
|= FC_SPP_EST_IMG_PAIR
;
382 if (!(fcp_parm
& FCP_SPPF_INIT_FCN
))
383 return FC_SPP_RESP_CONF
;
384 sess
= ft_sess_create(tport
, rdata
->ids
.port_id
, acl
);
386 return FC_SPP_RESP_RES
;
389 sess
->params
= fcp_parm
;
390 sess
->port_name
= rdata
->ids
.port_name
;
391 sess
->max_frame
= rdata
->maxframe_size
;
393 /* XXX TBD - clearing actions. unit attn, see 4.10 */
397 * OR in our service parameters with other provider (initiator), if any.
400 fcp_parm
= ntohl(spp
->spp_params
);
401 fcp_parm
&= ~FCP_SPPF_RETRY
;
402 spp
->spp_params
= htonl(fcp_parm
| FCP_SPPF_TARG_FCN
);
403 return FC_SPP_RESP_ACK
;
406 fcp_parm
= ntohl(spp
->spp_params
);
407 fcp_parm
&= ~FCP_SPPF_TARG_FCN
;
408 spp
->spp_params
= htonl(fcp_parm
);
413 * tcm_fcp_prli() - Handle incoming or outgoing PRLI for the FCP target
414 * @rdata: remote port private
415 * @spp_len: service parameter page length
416 * @rspp: received service parameter page (NULL for outgoing PRLI)
417 * @spp: response service parameter page
419 * Returns spp response code.
421 static int ft_prli(struct fc_rport_priv
*rdata
, u32 spp_len
,
422 const struct fc_els_spp
*rspp
, struct fc_els_spp
*spp
)
426 mutex_lock(&ft_lport_lock
);
427 ret
= ft_prli_locked(rdata
, spp_len
, rspp
, spp
);
428 mutex_unlock(&ft_lport_lock
);
429 pr_debug("port_id %x flags %x ret %x\n",
430 rdata
->ids
.port_id
, rspp
? rspp
->spp_flags
: 0, ret
);
434 static void ft_sess_free(struct kref
*kref
)
436 struct ft_sess
*sess
= container_of(kref
, struct ft_sess
, kref
);
438 transport_deregister_session(sess
->se_sess
);
439 kfree_rcu(sess
, rcu
);
442 void ft_sess_put(struct ft_sess
*sess
)
444 int sess_held
= atomic_read(&sess
->kref
.refcount
);
447 kref_put(&sess
->kref
, ft_sess_free
);
450 static void ft_prlo(struct fc_rport_priv
*rdata
)
452 struct ft_sess
*sess
;
453 struct ft_tport
*tport
;
455 mutex_lock(&ft_lport_lock
);
456 tport
= rcu_dereference_protected(rdata
->local_port
->prov
[FC_TYPE_FCP
],
457 lockdep_is_held(&ft_lport_lock
));
460 mutex_unlock(&ft_lport_lock
);
463 sess
= ft_sess_delete(tport
, rdata
->ids
.port_id
);
465 mutex_unlock(&ft_lport_lock
);
468 mutex_unlock(&ft_lport_lock
);
469 transport_deregister_session_configfs(sess
->se_sess
);
470 ft_sess_put(sess
); /* release from table */
472 /* XXX TBD - clearing actions. unit attn, see 4.10 */
476 * Handle incoming FCP request.
477 * Caller has verified that the frame is type FCP.
479 static void ft_recv(struct fc_lport
*lport
, struct fc_frame
*fp
)
481 struct ft_sess
*sess
;
482 u32 sid
= fc_frame_sid(fp
);
484 pr_debug("sid %x\n", sid
);
486 sess
= ft_sess_get(lport
, sid
);
488 pr_debug("sid %x sess lookup failed\n", sid
);
489 /* TBD XXX - if FCP_CMND, send PRLO */
493 ft_recv_req(sess
, fp
); /* must do ft_sess_put() */
497 * Provider ops for libfc.
499 struct fc4_prov ft_prov
= {
503 .module
= THIS_MODULE
,