2 * Copyright (c) 2004, 2005 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
7 * Copyright (c) 2005 Network Appliance, Inc. All rights reserved.
9 * This software is available to you under a choice of one of two
10 * licenses. You may choose to be licensed under the terms of the GNU
11 * General Public License (GPL) Version 2, available from the file
12 * COPYING in the main directory of this source tree, or the
13 * OpenIB.org BSD license below:
15 * Redistribution and use in source and binary forms, with or
16 * without modification, are permitted provided that the following
19 * - Redistributions of source code must retain the above
20 * copyright notice, this list of conditions and the following
23 * - Redistributions in binary form must reproduce the above
24 * copyright notice, this list of conditions and the following
25 * disclaimer in the documentation and/or other materials
26 * provided with the distribution.
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
38 #include <linux/dma-mapping.h>
39 #include <linux/err.h>
40 #include <linux/idr.h>
41 #include <linux/interrupt.h>
42 #include <linux/rbtree.h>
43 #include <linux/sched.h>
44 #include <linux/spinlock.h>
45 #include <linux/workqueue.h>
46 #include <linux/completion.h>
47 #include <linux/slab.h>
48 #include <linux/module.h>
50 #include <rdma/iw_cm.h>
51 #include <rdma/ib_addr.h>
55 MODULE_AUTHOR("Tom Tucker");
56 MODULE_DESCRIPTION("iWARP CM");
57 MODULE_LICENSE("Dual BSD/GPL");
59 static struct workqueue_struct
*iwcm_wq
;
61 struct work_struct work
;
62 struct iwcm_id_private
*cm_id
;
63 struct list_head list
;
64 struct iw_cm_event event
;
65 struct list_head free_list
;
69 * The following services provide a mechanism for pre-allocating iwcm_work
70 * elements. The design pre-allocates them based on the cm_id type:
71 * LISTENING IDS: Get enough elements preallocated to handle the
73 * ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE
74 * PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE
76 * Allocating them in connect and listen avoids having to deal
77 * with allocation failures on the event upcall from the provider (which
78 * is called in the interrupt context).
80 * One exception is when creating the cm_id for incoming connection requests.
81 * There are two cases:
82 * 1) in the event upcall, cm_event_handler(), for a listening cm_id. If
83 * the backlog is exceeded, then no more connection request events will
84 * be processed. cm_event_handler() returns -ENOMEM in this case. Its up
85 * to the provider to reject the connection request.
86 * 2) in the connection request workqueue handler, cm_conn_req_handler().
87 * If work elements cannot be allocated for the new connect request cm_id,
88 * then IWCM will call the provider reject method. This is ok since
89 * cm_conn_req_handler() runs in the workqueue thread context.
92 static struct iwcm_work
*get_work(struct iwcm_id_private
*cm_id_priv
)
94 struct iwcm_work
*work
;
96 if (list_empty(&cm_id_priv
->work_free_list
))
98 work
= list_entry(cm_id_priv
->work_free_list
.next
, struct iwcm_work
,
100 list_del_init(&work
->free_list
);
104 static void put_work(struct iwcm_work
*work
)
106 list_add(&work
->free_list
, &work
->cm_id
->work_free_list
);
109 static void dealloc_work_entries(struct iwcm_id_private
*cm_id_priv
)
111 struct list_head
*e
, *tmp
;
113 list_for_each_safe(e
, tmp
, &cm_id_priv
->work_free_list
)
114 kfree(list_entry(e
, struct iwcm_work
, free_list
));
117 static int alloc_work_entries(struct iwcm_id_private
*cm_id_priv
, int count
)
119 struct iwcm_work
*work
;
121 BUG_ON(!list_empty(&cm_id_priv
->work_free_list
));
123 work
= kmalloc(sizeof(struct iwcm_work
), GFP_KERNEL
);
125 dealloc_work_entries(cm_id_priv
);
128 work
->cm_id
= cm_id_priv
;
129 INIT_LIST_HEAD(&work
->list
);
136 * Save private data from incoming connection requests to
137 * iw_cm_event, so the low level driver doesn't have to. Adjust
138 * the event ptr to point to the local copy.
140 static int copy_private_data(struct iw_cm_event
*event
)
144 p
= kmemdup(event
->private_data
, event
->private_data_len
, GFP_ATOMIC
);
147 event
->private_data
= p
;
151 static void free_cm_id(struct iwcm_id_private
*cm_id_priv
)
153 dealloc_work_entries(cm_id_priv
);
158 * Release a reference on cm_id. If the last reference is being
159 * released, enable the waiting thread (in iw_destroy_cm_id) to
160 * get woken up, and return 1 if a thread is already waiting.
162 static int iwcm_deref_id(struct iwcm_id_private
*cm_id_priv
)
164 BUG_ON(atomic_read(&cm_id_priv
->refcount
)==0);
165 if (atomic_dec_and_test(&cm_id_priv
->refcount
)) {
166 BUG_ON(!list_empty(&cm_id_priv
->work_list
));
167 complete(&cm_id_priv
->destroy_comp
);
174 static void add_ref(struct iw_cm_id
*cm_id
)
176 struct iwcm_id_private
*cm_id_priv
;
177 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
178 atomic_inc(&cm_id_priv
->refcount
);
181 static void rem_ref(struct iw_cm_id
*cm_id
)
183 struct iwcm_id_private
*cm_id_priv
;
186 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
189 * Test bit before deref in case the cm_id gets freed on another
192 cb_destroy
= test_bit(IWCM_F_CALLBACK_DESTROY
, &cm_id_priv
->flags
);
193 if (iwcm_deref_id(cm_id_priv
) && cb_destroy
) {
194 BUG_ON(!list_empty(&cm_id_priv
->work_list
));
195 free_cm_id(cm_id_priv
);
199 static int cm_event_handler(struct iw_cm_id
*cm_id
, struct iw_cm_event
*event
);
201 struct iw_cm_id
*iw_create_cm_id(struct ib_device
*device
,
202 iw_cm_handler cm_handler
,
205 struct iwcm_id_private
*cm_id_priv
;
207 cm_id_priv
= kzalloc(sizeof(*cm_id_priv
), GFP_KERNEL
);
209 return ERR_PTR(-ENOMEM
);
211 cm_id_priv
->state
= IW_CM_STATE_IDLE
;
212 cm_id_priv
->id
.device
= device
;
213 cm_id_priv
->id
.cm_handler
= cm_handler
;
214 cm_id_priv
->id
.context
= context
;
215 cm_id_priv
->id
.event_handler
= cm_event_handler
;
216 cm_id_priv
->id
.add_ref
= add_ref
;
217 cm_id_priv
->id
.rem_ref
= rem_ref
;
218 spin_lock_init(&cm_id_priv
->lock
);
219 atomic_set(&cm_id_priv
->refcount
, 1);
220 init_waitqueue_head(&cm_id_priv
->connect_wait
);
221 init_completion(&cm_id_priv
->destroy_comp
);
222 INIT_LIST_HEAD(&cm_id_priv
->work_list
);
223 INIT_LIST_HEAD(&cm_id_priv
->work_free_list
);
225 return &cm_id_priv
->id
;
227 EXPORT_SYMBOL(iw_create_cm_id
);
230 static int iwcm_modify_qp_err(struct ib_qp
*qp
)
232 struct ib_qp_attr qp_attr
;
237 qp_attr
.qp_state
= IB_QPS_ERR
;
238 return ib_modify_qp(qp
, &qp_attr
, IB_QP_STATE
);
242 * This is really the RDMAC CLOSING state. It is most similar to the
245 static int iwcm_modify_qp_sqd(struct ib_qp
*qp
)
247 struct ib_qp_attr qp_attr
;
250 qp_attr
.qp_state
= IB_QPS_SQD
;
251 return ib_modify_qp(qp
, &qp_attr
, IB_QP_STATE
);
257 * Block if a passive or active connection is currently being processed. Then
258 * process the event as follows:
259 * - If we are ESTABLISHED, move to CLOSING and modify the QP state
260 * based on the abrupt flag
261 * - If the connection is already in the CLOSING or IDLE state, the peer is
262 * disconnecting concurrently with us and we've already seen the
263 * DISCONNECT event -- ignore the request and return 0
264 * - Disconnect on a listening endpoint returns -EINVAL
266 int iw_cm_disconnect(struct iw_cm_id
*cm_id
, int abrupt
)
268 struct iwcm_id_private
*cm_id_priv
;
271 struct ib_qp
*qp
= NULL
;
273 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
274 /* Wait if we're currently in a connect or accept downcall */
275 wait_event(cm_id_priv
->connect_wait
,
276 !test_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
));
278 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
279 switch (cm_id_priv
->state
) {
280 case IW_CM_STATE_ESTABLISHED
:
281 cm_id_priv
->state
= IW_CM_STATE_CLOSING
;
283 /* QP could be <nul> for user-mode client */
289 case IW_CM_STATE_LISTEN
:
292 case IW_CM_STATE_CLOSING
:
293 /* remote peer closed first */
294 case IW_CM_STATE_IDLE
:
295 /* accept or connect returned !0 */
297 case IW_CM_STATE_CONN_RECV
:
299 * App called disconnect before/without calling accept after
300 * connect_request event delivered.
303 case IW_CM_STATE_CONN_SENT
:
304 /* Can only get here if wait above fails */
308 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
312 ret
= iwcm_modify_qp_err(qp
);
314 ret
= iwcm_modify_qp_sqd(qp
);
317 * If both sides are disconnecting the QP could
318 * already be in ERR or SQD states
325 EXPORT_SYMBOL(iw_cm_disconnect
);
328 * CM_ID <-- DESTROYING
330 * Clean up all resources associated with the connection and release
331 * the initial reference taken by iw_create_cm_id.
333 static void destroy_cm_id(struct iw_cm_id
*cm_id
)
335 struct iwcm_id_private
*cm_id_priv
;
339 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
341 * Wait if we're currently in a connect or accept downcall. A
342 * listening endpoint should never block here.
344 wait_event(cm_id_priv
->connect_wait
,
345 !test_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
));
347 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
348 switch (cm_id_priv
->state
) {
349 case IW_CM_STATE_LISTEN
:
350 cm_id_priv
->state
= IW_CM_STATE_DESTROYING
;
351 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
352 /* destroy the listening endpoint */
353 ret
= cm_id
->device
->iwcm
->destroy_listen(cm_id
);
354 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
356 case IW_CM_STATE_ESTABLISHED
:
357 cm_id_priv
->state
= IW_CM_STATE_DESTROYING
;
358 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
359 /* Abrupt close of the connection */
360 (void)iwcm_modify_qp_err(cm_id_priv
->qp
);
361 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
363 case IW_CM_STATE_IDLE
:
364 case IW_CM_STATE_CLOSING
:
365 cm_id_priv
->state
= IW_CM_STATE_DESTROYING
;
367 case IW_CM_STATE_CONN_RECV
:
369 * App called destroy before/without calling accept after
370 * receiving connection request event notification or
371 * returned non zero from the event callback function.
372 * In either case, must tell the provider to reject.
374 cm_id_priv
->state
= IW_CM_STATE_DESTROYING
;
375 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
376 cm_id
->device
->iwcm
->reject(cm_id
, NULL
, 0);
377 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
379 case IW_CM_STATE_CONN_SENT
:
380 case IW_CM_STATE_DESTROYING
:
385 if (cm_id_priv
->qp
) {
386 cm_id_priv
->id
.device
->iwcm
->rem_ref(cm_id_priv
->qp
);
387 cm_id_priv
->qp
= NULL
;
389 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
391 (void)iwcm_deref_id(cm_id_priv
);
395 * This function is only called by the application thread and cannot
396 * be called by the event thread. The function will wait for all
397 * references to be released on the cm_id and then kfree the cm_id
400 void iw_destroy_cm_id(struct iw_cm_id
*cm_id
)
402 struct iwcm_id_private
*cm_id_priv
;
404 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
405 BUG_ON(test_bit(IWCM_F_CALLBACK_DESTROY
, &cm_id_priv
->flags
));
407 destroy_cm_id(cm_id
);
409 wait_for_completion(&cm_id_priv
->destroy_comp
);
411 free_cm_id(cm_id_priv
);
413 EXPORT_SYMBOL(iw_destroy_cm_id
);
418 * Start listening for connect requests. Generates one CONNECT_REQUEST
419 * event for each inbound connect request.
421 int iw_cm_listen(struct iw_cm_id
*cm_id
, int backlog
)
423 struct iwcm_id_private
*cm_id_priv
;
427 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
429 ret
= alloc_work_entries(cm_id_priv
, backlog
);
433 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
434 switch (cm_id_priv
->state
) {
435 case IW_CM_STATE_IDLE
:
436 cm_id_priv
->state
= IW_CM_STATE_LISTEN
;
437 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
438 ret
= cm_id
->device
->iwcm
->create_listen(cm_id
, backlog
);
440 cm_id_priv
->state
= IW_CM_STATE_IDLE
;
441 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
446 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
450 EXPORT_SYMBOL(iw_cm_listen
);
455 * Rejects an inbound connection request. No events are generated.
457 int iw_cm_reject(struct iw_cm_id
*cm_id
,
458 const void *private_data
,
461 struct iwcm_id_private
*cm_id_priv
;
465 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
466 set_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
468 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
469 if (cm_id_priv
->state
!= IW_CM_STATE_CONN_RECV
) {
470 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
471 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
472 wake_up_all(&cm_id_priv
->connect_wait
);
475 cm_id_priv
->state
= IW_CM_STATE_IDLE
;
476 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
478 ret
= cm_id
->device
->iwcm
->reject(cm_id
, private_data
,
481 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
482 wake_up_all(&cm_id_priv
->connect_wait
);
486 EXPORT_SYMBOL(iw_cm_reject
);
489 * CM_ID <-- ESTABLISHED
491 * Accepts an inbound connection request and generates an ESTABLISHED
492 * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
493 * until the ESTABLISHED event is received from the provider.
495 int iw_cm_accept(struct iw_cm_id
*cm_id
,
496 struct iw_cm_conn_param
*iw_param
)
498 struct iwcm_id_private
*cm_id_priv
;
503 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
504 set_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
506 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
507 if (cm_id_priv
->state
!= IW_CM_STATE_CONN_RECV
) {
508 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
509 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
510 wake_up_all(&cm_id_priv
->connect_wait
);
513 /* Get the ib_qp given the QPN */
514 qp
= cm_id
->device
->iwcm
->get_qp(cm_id
->device
, iw_param
->qpn
);
516 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
517 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
518 wake_up_all(&cm_id_priv
->connect_wait
);
521 cm_id
->device
->iwcm
->add_ref(qp
);
523 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
525 ret
= cm_id
->device
->iwcm
->accept(cm_id
, iw_param
);
527 /* An error on accept precludes provider events */
528 BUG_ON(cm_id_priv
->state
!= IW_CM_STATE_CONN_RECV
);
529 cm_id_priv
->state
= IW_CM_STATE_IDLE
;
530 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
531 if (cm_id_priv
->qp
) {
532 cm_id
->device
->iwcm
->rem_ref(qp
);
533 cm_id_priv
->qp
= NULL
;
535 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
536 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
537 wake_up_all(&cm_id_priv
->connect_wait
);
542 EXPORT_SYMBOL(iw_cm_accept
);
545 * Active Side: CM_ID <-- CONN_SENT
547 * If successful, results in the generation of a CONNECT_REPLY
548 * event. iw_cm_disconnect and iw_cm_destroy will block until the
549 * CONNECT_REPLY event is received from the provider.
551 int iw_cm_connect(struct iw_cm_id
*cm_id
, struct iw_cm_conn_param
*iw_param
)
553 struct iwcm_id_private
*cm_id_priv
;
558 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
560 ret
= alloc_work_entries(cm_id_priv
, 4);
564 set_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
565 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
567 if (cm_id_priv
->state
!= IW_CM_STATE_IDLE
) {
568 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
569 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
570 wake_up_all(&cm_id_priv
->connect_wait
);
574 /* Get the ib_qp given the QPN */
575 qp
= cm_id
->device
->iwcm
->get_qp(cm_id
->device
, iw_param
->qpn
);
577 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
578 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
579 wake_up_all(&cm_id_priv
->connect_wait
);
582 cm_id
->device
->iwcm
->add_ref(qp
);
584 cm_id_priv
->state
= IW_CM_STATE_CONN_SENT
;
585 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
587 ret
= cm_id
->device
->iwcm
->connect(cm_id
, iw_param
);
589 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
590 if (cm_id_priv
->qp
) {
591 cm_id
->device
->iwcm
->rem_ref(qp
);
592 cm_id_priv
->qp
= NULL
;
594 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
595 BUG_ON(cm_id_priv
->state
!= IW_CM_STATE_CONN_SENT
);
596 cm_id_priv
->state
= IW_CM_STATE_IDLE
;
597 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
598 wake_up_all(&cm_id_priv
->connect_wait
);
603 EXPORT_SYMBOL(iw_cm_connect
);
606 * Passive Side: new CM_ID <-- CONN_RECV
608 * Handles an inbound connect request. The function creates a new
609 * iw_cm_id to represent the new connection and inherits the client
610 * callback function and other attributes from the listening parent.
612 * The work item contains a pointer to the listen_cm_id and the event. The
613 * listen_cm_id contains the client cm_handler, context and
614 * device. These are copied when the device is cloned. The event
615 * contains the new four tuple.
617 * An error on the child should not affect the parent, so this
618 * function does not return a value.
620 static void cm_conn_req_handler(struct iwcm_id_private
*listen_id_priv
,
621 struct iw_cm_event
*iw_event
)
624 struct iw_cm_id
*cm_id
;
625 struct iwcm_id_private
*cm_id_priv
;
629 * The provider should never generate a connection request
630 * event with a bad status.
632 BUG_ON(iw_event
->status
);
634 cm_id
= iw_create_cm_id(listen_id_priv
->id
.device
,
635 listen_id_priv
->id
.cm_handler
,
636 listen_id_priv
->id
.context
);
637 /* If the cm_id could not be created, ignore the request */
641 cm_id
->provider_data
= iw_event
->provider_data
;
642 cm_id
->local_addr
= iw_event
->local_addr
;
643 cm_id
->remote_addr
= iw_event
->remote_addr
;
645 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
646 cm_id_priv
->state
= IW_CM_STATE_CONN_RECV
;
649 * We could be destroying the listening id. If so, ignore this
652 spin_lock_irqsave(&listen_id_priv
->lock
, flags
);
653 if (listen_id_priv
->state
!= IW_CM_STATE_LISTEN
) {
654 spin_unlock_irqrestore(&listen_id_priv
->lock
, flags
);
655 iw_cm_reject(cm_id
, NULL
, 0);
656 iw_destroy_cm_id(cm_id
);
659 spin_unlock_irqrestore(&listen_id_priv
->lock
, flags
);
661 ret
= alloc_work_entries(cm_id_priv
, 3);
663 iw_cm_reject(cm_id
, NULL
, 0);
664 iw_destroy_cm_id(cm_id
);
668 /* Call the client CM handler */
669 ret
= cm_id
->cm_handler(cm_id
, iw_event
);
671 iw_cm_reject(cm_id
, NULL
, 0);
672 set_bit(IWCM_F_CALLBACK_DESTROY
, &cm_id_priv
->flags
);
673 destroy_cm_id(cm_id
);
674 if (atomic_read(&cm_id_priv
->refcount
)==0)
675 free_cm_id(cm_id_priv
);
679 if (iw_event
->private_data_len
)
680 kfree(iw_event
->private_data
);
684 * Passive Side: CM_ID <-- ESTABLISHED
686 * The provider generated an ESTABLISHED event which means that
687 * the MPA negotion has completed successfully and we are now in MPA
690 * This event can only be received in the CONN_RECV state. If the
691 * remote peer closed, the ESTABLISHED event would be received followed
692 * by the CLOSE event. If the app closes, it will block until we wake
693 * it up after processing this event.
695 static int cm_conn_est_handler(struct iwcm_id_private
*cm_id_priv
,
696 struct iw_cm_event
*iw_event
)
701 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
704 * We clear the CONNECT_WAIT bit here to allow the callback
705 * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
706 * from a callback handler is not allowed.
708 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
709 BUG_ON(cm_id_priv
->state
!= IW_CM_STATE_CONN_RECV
);
710 cm_id_priv
->state
= IW_CM_STATE_ESTABLISHED
;
711 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
712 ret
= cm_id_priv
->id
.cm_handler(&cm_id_priv
->id
, iw_event
);
713 wake_up_all(&cm_id_priv
->connect_wait
);
719 * Active Side: CM_ID <-- ESTABLISHED
721 * The app has called connect and is waiting for the established event to
722 * post it's requests to the server. This event will wake up anyone
723 * blocked in iw_cm_disconnect or iw_destroy_id.
725 static int cm_conn_rep_handler(struct iwcm_id_private
*cm_id_priv
,
726 struct iw_cm_event
*iw_event
)
731 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
733 * Clear the connect wait bit so a callback function calling
734 * iw_cm_disconnect will not wait and deadlock this thread
736 clear_bit(IWCM_F_CONNECT_WAIT
, &cm_id_priv
->flags
);
737 BUG_ON(cm_id_priv
->state
!= IW_CM_STATE_CONN_SENT
);
738 if (iw_event
->status
== 0) {
739 cm_id_priv
->id
.local_addr
= iw_event
->local_addr
;
740 cm_id_priv
->id
.remote_addr
= iw_event
->remote_addr
;
741 cm_id_priv
->state
= IW_CM_STATE_ESTABLISHED
;
743 /* REJECTED or RESET */
744 cm_id_priv
->id
.device
->iwcm
->rem_ref(cm_id_priv
->qp
);
745 cm_id_priv
->qp
= NULL
;
746 cm_id_priv
->state
= IW_CM_STATE_IDLE
;
748 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
749 ret
= cm_id_priv
->id
.cm_handler(&cm_id_priv
->id
, iw_event
);
751 if (iw_event
->private_data_len
)
752 kfree(iw_event
->private_data
);
754 /* Wake up waiters on connect complete */
755 wake_up_all(&cm_id_priv
->connect_wait
);
763 * If in the ESTABLISHED state, move to CLOSING.
765 static void cm_disconnect_handler(struct iwcm_id_private
*cm_id_priv
,
766 struct iw_cm_event
*iw_event
)
770 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
771 if (cm_id_priv
->state
== IW_CM_STATE_ESTABLISHED
)
772 cm_id_priv
->state
= IW_CM_STATE_CLOSING
;
773 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
779 * If in the ESTBLISHED or CLOSING states, the QP will have have been
780 * moved by the provider to the ERR state. Disassociate the CM_ID from
781 * the QP, move to IDLE, and remove the 'connected' reference.
783 * If in some other state, the cm_id was destroyed asynchronously.
784 * This is the last reference that will result in waking up
785 * the app thread blocked in iw_destroy_cm_id.
787 static int cm_close_handler(struct iwcm_id_private
*cm_id_priv
,
788 struct iw_cm_event
*iw_event
)
792 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
794 if (cm_id_priv
->qp
) {
795 cm_id_priv
->id
.device
->iwcm
->rem_ref(cm_id_priv
->qp
);
796 cm_id_priv
->qp
= NULL
;
798 switch (cm_id_priv
->state
) {
799 case IW_CM_STATE_ESTABLISHED
:
800 case IW_CM_STATE_CLOSING
:
801 cm_id_priv
->state
= IW_CM_STATE_IDLE
;
802 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
803 ret
= cm_id_priv
->id
.cm_handler(&cm_id_priv
->id
, iw_event
);
804 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
806 case IW_CM_STATE_DESTROYING
:
811 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
816 static int process_event(struct iwcm_id_private
*cm_id_priv
,
817 struct iw_cm_event
*iw_event
)
821 switch (iw_event
->event
) {
822 case IW_CM_EVENT_CONNECT_REQUEST
:
823 cm_conn_req_handler(cm_id_priv
, iw_event
);
825 case IW_CM_EVENT_CONNECT_REPLY
:
826 ret
= cm_conn_rep_handler(cm_id_priv
, iw_event
);
828 case IW_CM_EVENT_ESTABLISHED
:
829 ret
= cm_conn_est_handler(cm_id_priv
, iw_event
);
831 case IW_CM_EVENT_DISCONNECT
:
832 cm_disconnect_handler(cm_id_priv
, iw_event
);
834 case IW_CM_EVENT_CLOSE
:
835 ret
= cm_close_handler(cm_id_priv
, iw_event
);
845 * Process events on the work_list for the cm_id. If the callback
846 * function requests that the cm_id be deleted, a flag is set in the
847 * cm_id flags to indicate that when the last reference is
848 * removed, the cm_id is to be destroyed. This is necessary to
849 * distinguish between an object that will be destroyed by the app
850 * thread asleep on the destroy_comp list vs. an object destroyed
851 * here synchronously when the last reference is removed.
853 static void cm_work_handler(struct work_struct
*_work
)
855 struct iwcm_work
*work
= container_of(_work
, struct iwcm_work
, work
);
856 struct iw_cm_event levent
;
857 struct iwcm_id_private
*cm_id_priv
= work
->cm_id
;
863 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
864 empty
= list_empty(&cm_id_priv
->work_list
);
866 work
= list_entry(cm_id_priv
->work_list
.next
,
867 struct iwcm_work
, list
);
868 list_del_init(&work
->list
);
869 empty
= list_empty(&cm_id_priv
->work_list
);
870 levent
= work
->event
;
872 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
874 ret
= process_event(cm_id_priv
, &levent
);
876 set_bit(IWCM_F_CALLBACK_DESTROY
, &cm_id_priv
->flags
);
877 destroy_cm_id(&cm_id_priv
->id
);
879 BUG_ON(atomic_read(&cm_id_priv
->refcount
)==0);
880 destroy_id
= test_bit(IWCM_F_CALLBACK_DESTROY
, &cm_id_priv
->flags
);
881 if (iwcm_deref_id(cm_id_priv
)) {
883 BUG_ON(!list_empty(&cm_id_priv
->work_list
));
884 free_cm_id(cm_id_priv
);
890 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
892 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
896 * This function is called on interrupt context. Schedule events on
897 * the iwcm_wq thread to allow callback functions to downcall into
898 * the CM and/or block. Events are queued to a per-CM_ID
899 * work_list. If this is the first event on the work_list, the work
900 * element is also queued on the iwcm_wq thread.
902 * Each event holds a reference on the cm_id. Until the last posted
903 * event has been delivered and processed, the cm_id cannot be
907 * 0 - the event was handled.
908 * -ENOMEM - the event was not handled due to lack of resources.
910 static int cm_event_handler(struct iw_cm_id
*cm_id
,
911 struct iw_cm_event
*iw_event
)
913 struct iwcm_work
*work
;
914 struct iwcm_id_private
*cm_id_priv
;
918 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
920 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
921 work
= get_work(cm_id_priv
);
927 INIT_WORK(&work
->work
, cm_work_handler
);
928 work
->cm_id
= cm_id_priv
;
929 work
->event
= *iw_event
;
931 if ((work
->event
.event
== IW_CM_EVENT_CONNECT_REQUEST
||
932 work
->event
.event
== IW_CM_EVENT_CONNECT_REPLY
) &&
933 work
->event
.private_data_len
) {
934 ret
= copy_private_data(&work
->event
);
941 atomic_inc(&cm_id_priv
->refcount
);
942 if (list_empty(&cm_id_priv
->work_list
)) {
943 list_add_tail(&work
->list
, &cm_id_priv
->work_list
);
944 queue_work(iwcm_wq
, &work
->work
);
946 list_add_tail(&work
->list
, &cm_id_priv
->work_list
);
948 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
952 static int iwcm_init_qp_init_attr(struct iwcm_id_private
*cm_id_priv
,
953 struct ib_qp_attr
*qp_attr
,
959 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
960 switch (cm_id_priv
->state
) {
961 case IW_CM_STATE_IDLE
:
962 case IW_CM_STATE_CONN_SENT
:
963 case IW_CM_STATE_CONN_RECV
:
964 case IW_CM_STATE_ESTABLISHED
:
965 *qp_attr_mask
= IB_QP_STATE
| IB_QP_ACCESS_FLAGS
;
966 qp_attr
->qp_access_flags
= IB_ACCESS_REMOTE_WRITE
|
967 IB_ACCESS_REMOTE_READ
;
974 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
978 static int iwcm_init_qp_rts_attr(struct iwcm_id_private
*cm_id_priv
,
979 struct ib_qp_attr
*qp_attr
,
985 spin_lock_irqsave(&cm_id_priv
->lock
, flags
);
986 switch (cm_id_priv
->state
) {
987 case IW_CM_STATE_IDLE
:
988 case IW_CM_STATE_CONN_SENT
:
989 case IW_CM_STATE_CONN_RECV
:
990 case IW_CM_STATE_ESTABLISHED
:
998 spin_unlock_irqrestore(&cm_id_priv
->lock
, flags
);
1002 int iw_cm_init_qp_attr(struct iw_cm_id
*cm_id
,
1003 struct ib_qp_attr
*qp_attr
,
1006 struct iwcm_id_private
*cm_id_priv
;
1009 cm_id_priv
= container_of(cm_id
, struct iwcm_id_private
, id
);
1010 switch (qp_attr
->qp_state
) {
1013 ret
= iwcm_init_qp_init_attr(cm_id_priv
,
1014 qp_attr
, qp_attr_mask
);
1017 ret
= iwcm_init_qp_rts_attr(cm_id_priv
,
1018 qp_attr
, qp_attr_mask
);
1026 EXPORT_SYMBOL(iw_cm_init_qp_attr
);
1028 static int __init
iw_cm_init(void)
1030 iwcm_wq
= create_singlethread_workqueue("iw_cm_wq");
1037 static void __exit
iw_cm_cleanup(void)
1039 destroy_workqueue(iwcm_wq
);
1042 module_init(iw_cm_init
);
1043 module_exit(iw_cm_cleanup
);