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>
48 #include <rdma/iw_cm.h>
49 #include <rdma/ib_addr.h>
53 MODULE_AUTHOR("Tom Tucker");
54 MODULE_DESCRIPTION("iWARP CM");
55 MODULE_LICENSE("Dual BSD/GPL");
57 static struct workqueue_struct *iwcm_wq;
59 struct work_struct work;
60 struct iwcm_id_private *cm_id;
61 struct list_head list;
62 struct iw_cm_event event;
63 struct list_head free_list;
67 * The following services provide a mechanism for pre-allocating iwcm_work
68 * elements. The design pre-allocates them based on the cm_id type:
69 * LISTENING IDS: Get enough elements preallocated to handle the
71 * ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE
72 * PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE
74 * Allocating them in connect and listen avoids having to deal
75 * with allocation failures on the event upcall from the provider (which
76 * is called in the interrupt context).
78 * One exception is when creating the cm_id for incoming connection requests.
79 * There are two cases:
80 * 1) in the event upcall, cm_event_handler(), for a listening cm_id. If
81 * the backlog is exceeded, then no more connection request events will
82 * be processed. cm_event_handler() returns -ENOMEM in this case. Its up
83 * to the provider to reject the connection request.
84 * 2) in the connection request workqueue handler, cm_conn_req_handler().
85 * If work elements cannot be allocated for the new connect request cm_id,
86 * then IWCM will call the provider reject method. This is ok since
87 * cm_conn_req_handler() runs in the workqueue thread context.
90 static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv)
92 struct iwcm_work *work;
94 if (list_empty(&cm_id_priv->work_free_list))
96 work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work,
98 list_del_init(&work->free_list);
102 static void put_work(struct iwcm_work *work)
104 list_add(&work->free_list, &work->cm_id->work_free_list);
107 static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
109 struct list_head *e, *tmp;
111 list_for_each_safe(e, tmp, &cm_id_priv->work_free_list)
112 kfree(list_entry(e, struct iwcm_work, free_list));
115 static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
117 struct iwcm_work *work;
119 BUG_ON(!list_empty(&cm_id_priv->work_free_list));
121 work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL);
123 dealloc_work_entries(cm_id_priv);
126 work->cm_id = cm_id_priv;
127 INIT_LIST_HEAD(&work->list);
134 * Save private data from incoming connection requests to
135 * iw_cm_event, so the low level driver doesn't have to. Adjust
136 * the event ptr to point to the local copy.
138 static int copy_private_data(struct iw_cm_event *event)
142 p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC);
145 event->private_data = p;
149 static void free_cm_id(struct iwcm_id_private *cm_id_priv)
151 dealloc_work_entries(cm_id_priv);
156 * Release a reference on cm_id. If the last reference is being
157 * released, enable the waiting thread (in iw_destroy_cm_id) to
158 * get woken up, and return 1 if a thread is already waiting.
160 static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
162 BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
163 if (atomic_dec_and_test(&cm_id_priv->refcount)) {
164 BUG_ON(!list_empty(&cm_id_priv->work_list));
165 complete(&cm_id_priv->destroy_comp);
172 static void add_ref(struct iw_cm_id *cm_id)
174 struct iwcm_id_private *cm_id_priv;
175 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
176 atomic_inc(&cm_id_priv->refcount);
179 static void rem_ref(struct iw_cm_id *cm_id)
181 struct iwcm_id_private *cm_id_priv;
182 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
183 if (iwcm_deref_id(cm_id_priv) &&
184 test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags)) {
185 BUG_ON(!list_empty(&cm_id_priv->work_list));
186 free_cm_id(cm_id_priv);
190 static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
192 struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
193 iw_cm_handler cm_handler,
196 struct iwcm_id_private *cm_id_priv;
198 cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
200 return ERR_PTR(-ENOMEM);
202 cm_id_priv->state = IW_CM_STATE_IDLE;
203 cm_id_priv->id.device = device;
204 cm_id_priv->id.cm_handler = cm_handler;
205 cm_id_priv->id.context = context;
206 cm_id_priv->id.event_handler = cm_event_handler;
207 cm_id_priv->id.add_ref = add_ref;
208 cm_id_priv->id.rem_ref = rem_ref;
209 spin_lock_init(&cm_id_priv->lock);
210 atomic_set(&cm_id_priv->refcount, 1);
211 init_waitqueue_head(&cm_id_priv->connect_wait);
212 init_completion(&cm_id_priv->destroy_comp);
213 INIT_LIST_HEAD(&cm_id_priv->work_list);
214 INIT_LIST_HEAD(&cm_id_priv->work_free_list);
216 return &cm_id_priv->id;
218 EXPORT_SYMBOL(iw_create_cm_id);
221 static int iwcm_modify_qp_err(struct ib_qp *qp)
223 struct ib_qp_attr qp_attr;
228 qp_attr.qp_state = IB_QPS_ERR;
229 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
233 * This is really the RDMAC CLOSING state. It is most similar to the
236 static int iwcm_modify_qp_sqd(struct ib_qp *qp)
238 struct ib_qp_attr qp_attr;
241 qp_attr.qp_state = IB_QPS_SQD;
242 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
248 * Block if a passive or active connection is currently being processed. Then
249 * process the event as follows:
250 * - If we are ESTABLISHED, move to CLOSING and modify the QP state
251 * based on the abrupt flag
252 * - If the connection is already in the CLOSING or IDLE state, the peer is
253 * disconnecting concurrently with us and we've already seen the
254 * DISCONNECT event -- ignore the request and return 0
255 * - Disconnect on a listening endpoint returns -EINVAL
257 int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
259 struct iwcm_id_private *cm_id_priv;
262 struct ib_qp *qp = NULL;
264 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
265 /* Wait if we're currently in a connect or accept downcall */
266 wait_event(cm_id_priv->connect_wait,
267 !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
269 spin_lock_irqsave(&cm_id_priv->lock, flags);
270 switch (cm_id_priv->state) {
271 case IW_CM_STATE_ESTABLISHED:
272 cm_id_priv->state = IW_CM_STATE_CLOSING;
274 /* QP could be <nul> for user-mode client */
280 case IW_CM_STATE_LISTEN:
283 case IW_CM_STATE_CLOSING:
284 /* remote peer closed first */
285 case IW_CM_STATE_IDLE:
286 /* accept or connect returned !0 */
288 case IW_CM_STATE_CONN_RECV:
290 * App called disconnect before/without calling accept after
291 * connect_request event delivered.
294 case IW_CM_STATE_CONN_SENT:
295 /* Can only get here if wait above fails */
299 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
303 ret = iwcm_modify_qp_err(qp);
305 ret = iwcm_modify_qp_sqd(qp);
308 * If both sides are disconnecting the QP could
309 * already be in ERR or SQD states
316 EXPORT_SYMBOL(iw_cm_disconnect);
319 * CM_ID <-- DESTROYING
321 * Clean up all resources associated with the connection and release
322 * the initial reference taken by iw_create_cm_id.
324 static void destroy_cm_id(struct iw_cm_id *cm_id)
326 struct iwcm_id_private *cm_id_priv;
330 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
332 * Wait if we're currently in a connect or accept downcall. A
333 * listening endpoint should never block here.
335 wait_event(cm_id_priv->connect_wait,
336 !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
338 spin_lock_irqsave(&cm_id_priv->lock, flags);
339 switch (cm_id_priv->state) {
340 case IW_CM_STATE_LISTEN:
341 cm_id_priv->state = IW_CM_STATE_DESTROYING;
342 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
343 /* destroy the listening endpoint */
344 ret = cm_id->device->iwcm->destroy_listen(cm_id);
345 spin_lock_irqsave(&cm_id_priv->lock, flags);
347 case IW_CM_STATE_ESTABLISHED:
348 cm_id_priv->state = IW_CM_STATE_DESTROYING;
349 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
350 /* Abrupt close of the connection */
351 (void)iwcm_modify_qp_err(cm_id_priv->qp);
352 spin_lock_irqsave(&cm_id_priv->lock, flags);
354 case IW_CM_STATE_IDLE:
355 case IW_CM_STATE_CLOSING:
356 cm_id_priv->state = IW_CM_STATE_DESTROYING;
358 case IW_CM_STATE_CONN_RECV:
360 * App called destroy before/without calling accept after
361 * receiving connection request event notification or
362 * returned non zero from the event callback function.
363 * In either case, must tell the provider to reject.
365 cm_id_priv->state = IW_CM_STATE_DESTROYING;
366 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
367 cm_id->device->iwcm->reject(cm_id, NULL, 0);
368 spin_lock_irqsave(&cm_id_priv->lock, flags);
370 case IW_CM_STATE_CONN_SENT:
371 case IW_CM_STATE_DESTROYING:
376 if (cm_id_priv->qp) {
377 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
378 cm_id_priv->qp = NULL;
380 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
382 (void)iwcm_deref_id(cm_id_priv);
386 * This function is only called by the application thread and cannot
387 * be called by the event thread. The function will wait for all
388 * references to be released on the cm_id and then kfree the cm_id
391 void iw_destroy_cm_id(struct iw_cm_id *cm_id)
393 struct iwcm_id_private *cm_id_priv;
395 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
396 BUG_ON(test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags));
398 destroy_cm_id(cm_id);
400 wait_for_completion(&cm_id_priv->destroy_comp);
402 free_cm_id(cm_id_priv);
404 EXPORT_SYMBOL(iw_destroy_cm_id);
409 * Start listening for connect requests. Generates one CONNECT_REQUEST
410 * event for each inbound connect request.
412 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
414 struct iwcm_id_private *cm_id_priv;
418 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
420 ret = alloc_work_entries(cm_id_priv, backlog);
424 spin_lock_irqsave(&cm_id_priv->lock, flags);
425 switch (cm_id_priv->state) {
426 case IW_CM_STATE_IDLE:
427 cm_id_priv->state = IW_CM_STATE_LISTEN;
428 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
429 ret = cm_id->device->iwcm->create_listen(cm_id, backlog);
431 cm_id_priv->state = IW_CM_STATE_IDLE;
432 spin_lock_irqsave(&cm_id_priv->lock, flags);
437 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
441 EXPORT_SYMBOL(iw_cm_listen);
446 * Rejects an inbound connection request. No events are generated.
448 int iw_cm_reject(struct iw_cm_id *cm_id,
449 const void *private_data,
452 struct iwcm_id_private *cm_id_priv;
456 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
457 set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
459 spin_lock_irqsave(&cm_id_priv->lock, flags);
460 if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
461 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
462 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
463 wake_up_all(&cm_id_priv->connect_wait);
466 cm_id_priv->state = IW_CM_STATE_IDLE;
467 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
469 ret = cm_id->device->iwcm->reject(cm_id, private_data,
472 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
473 wake_up_all(&cm_id_priv->connect_wait);
477 EXPORT_SYMBOL(iw_cm_reject);
480 * CM_ID <-- ESTABLISHED
482 * Accepts an inbound connection request and generates an ESTABLISHED
483 * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
484 * until the ESTABLISHED event is received from the provider.
486 int iw_cm_accept(struct iw_cm_id *cm_id,
487 struct iw_cm_conn_param *iw_param)
489 struct iwcm_id_private *cm_id_priv;
494 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
495 set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
497 spin_lock_irqsave(&cm_id_priv->lock, flags);
498 if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
499 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
500 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
501 wake_up_all(&cm_id_priv->connect_wait);
504 /* Get the ib_qp given the QPN */
505 qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
507 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
510 cm_id->device->iwcm->add_ref(qp);
512 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
514 ret = cm_id->device->iwcm->accept(cm_id, iw_param);
516 /* An error on accept precludes provider events */
517 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
518 cm_id_priv->state = IW_CM_STATE_IDLE;
519 spin_lock_irqsave(&cm_id_priv->lock, flags);
520 if (cm_id_priv->qp) {
521 cm_id->device->iwcm->rem_ref(qp);
522 cm_id_priv->qp = NULL;
524 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
525 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
526 wake_up_all(&cm_id_priv->connect_wait);
531 EXPORT_SYMBOL(iw_cm_accept);
534 * Active Side: CM_ID <-- CONN_SENT
536 * If successful, results in the generation of a CONNECT_REPLY
537 * event. iw_cm_disconnect and iw_cm_destroy will block until the
538 * CONNECT_REPLY event is received from the provider.
540 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
542 struct iwcm_id_private *cm_id_priv;
547 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
549 ret = alloc_work_entries(cm_id_priv, 4);
553 set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
554 spin_lock_irqsave(&cm_id_priv->lock, flags);
556 if (cm_id_priv->state != IW_CM_STATE_IDLE) {
557 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
558 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
559 wake_up_all(&cm_id_priv->connect_wait);
563 /* Get the ib_qp given the QPN */
564 qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
566 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
569 cm_id->device->iwcm->add_ref(qp);
571 cm_id_priv->state = IW_CM_STATE_CONN_SENT;
572 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
574 ret = cm_id->device->iwcm->connect(cm_id, iw_param);
576 spin_lock_irqsave(&cm_id_priv->lock, flags);
577 if (cm_id_priv->qp) {
578 cm_id->device->iwcm->rem_ref(qp);
579 cm_id_priv->qp = NULL;
581 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
582 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
583 cm_id_priv->state = IW_CM_STATE_IDLE;
584 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
585 wake_up_all(&cm_id_priv->connect_wait);
590 EXPORT_SYMBOL(iw_cm_connect);
593 * Passive Side: new CM_ID <-- CONN_RECV
595 * Handles an inbound connect request. The function creates a new
596 * iw_cm_id to represent the new connection and inherits the client
597 * callback function and other attributes from the listening parent.
599 * The work item contains a pointer to the listen_cm_id and the event. The
600 * listen_cm_id contains the client cm_handler, context and
601 * device. These are copied when the device is cloned. The event
602 * contains the new four tuple.
604 * An error on the child should not affect the parent, so this
605 * function does not return a value.
607 static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
608 struct iw_cm_event *iw_event)
611 struct iw_cm_id *cm_id;
612 struct iwcm_id_private *cm_id_priv;
616 * The provider should never generate a connection request
617 * event with a bad status.
619 BUG_ON(iw_event->status);
622 * We could be destroying the listening id. If so, ignore this
625 spin_lock_irqsave(&listen_id_priv->lock, flags);
626 if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
627 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
630 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
632 cm_id = iw_create_cm_id(listen_id_priv->id.device,
633 listen_id_priv->id.cm_handler,
634 listen_id_priv->id.context);
635 /* If the cm_id could not be created, ignore the request */
639 cm_id->provider_data = iw_event->provider_data;
640 cm_id->local_addr = iw_event->local_addr;
641 cm_id->remote_addr = iw_event->remote_addr;
643 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
644 cm_id_priv->state = IW_CM_STATE_CONN_RECV;
646 ret = alloc_work_entries(cm_id_priv, 3);
648 iw_cm_reject(cm_id, NULL, 0);
649 iw_destroy_cm_id(cm_id);
653 /* Call the client CM handler */
654 ret = cm_id->cm_handler(cm_id, iw_event);
656 iw_cm_reject(cm_id, NULL, 0);
657 set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
658 destroy_cm_id(cm_id);
659 if (atomic_read(&cm_id_priv->refcount)==0)
660 free_cm_id(cm_id_priv);
664 if (iw_event->private_data_len)
665 kfree(iw_event->private_data);
669 * Passive Side: CM_ID <-- ESTABLISHED
671 * The provider generated an ESTABLISHED event which means that
672 * the MPA negotion has completed successfully and we are now in MPA
675 * This event can only be received in the CONN_RECV state. If the
676 * remote peer closed, the ESTABLISHED event would be received followed
677 * by the CLOSE event. If the app closes, it will block until we wake
678 * it up after processing this event.
680 static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
681 struct iw_cm_event *iw_event)
686 spin_lock_irqsave(&cm_id_priv->lock, flags);
689 * We clear the CONNECT_WAIT bit here to allow the callback
690 * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
691 * from a callback handler is not allowed.
693 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
694 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
695 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
696 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
697 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
698 wake_up_all(&cm_id_priv->connect_wait);
704 * Active Side: CM_ID <-- ESTABLISHED
706 * The app has called connect and is waiting for the established event to
707 * post it's requests to the server. This event will wake up anyone
708 * blocked in iw_cm_disconnect or iw_destroy_id.
710 static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
711 struct iw_cm_event *iw_event)
716 spin_lock_irqsave(&cm_id_priv->lock, flags);
718 * Clear the connect wait bit so a callback function calling
719 * iw_cm_disconnect will not wait and deadlock this thread
721 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
722 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
723 if (iw_event->status == IW_CM_EVENT_STATUS_ACCEPTED) {
724 cm_id_priv->id.local_addr = iw_event->local_addr;
725 cm_id_priv->id.remote_addr = iw_event->remote_addr;
726 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
728 /* REJECTED or RESET */
729 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
730 cm_id_priv->qp = NULL;
731 cm_id_priv->state = IW_CM_STATE_IDLE;
733 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
734 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
736 if (iw_event->private_data_len)
737 kfree(iw_event->private_data);
739 /* Wake up waiters on connect complete */
740 wake_up_all(&cm_id_priv->connect_wait);
748 * If in the ESTABLISHED state, move to CLOSING.
750 static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
751 struct iw_cm_event *iw_event)
755 spin_lock_irqsave(&cm_id_priv->lock, flags);
756 if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
757 cm_id_priv->state = IW_CM_STATE_CLOSING;
758 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
764 * If in the ESTBLISHED or CLOSING states, the QP will have have been
765 * moved by the provider to the ERR state. Disassociate the CM_ID from
766 * the QP, move to IDLE, and remove the 'connected' reference.
768 * If in some other state, the cm_id was destroyed asynchronously.
769 * This is the last reference that will result in waking up
770 * the app thread blocked in iw_destroy_cm_id.
772 static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
773 struct iw_cm_event *iw_event)
777 spin_lock_irqsave(&cm_id_priv->lock, flags);
779 if (cm_id_priv->qp) {
780 cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
781 cm_id_priv->qp = NULL;
783 switch (cm_id_priv->state) {
784 case IW_CM_STATE_ESTABLISHED:
785 case IW_CM_STATE_CLOSING:
786 cm_id_priv->state = IW_CM_STATE_IDLE;
787 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
788 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
789 spin_lock_irqsave(&cm_id_priv->lock, flags);
791 case IW_CM_STATE_DESTROYING:
796 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
801 static int process_event(struct iwcm_id_private *cm_id_priv,
802 struct iw_cm_event *iw_event)
806 switch (iw_event->event) {
807 case IW_CM_EVENT_CONNECT_REQUEST:
808 cm_conn_req_handler(cm_id_priv, iw_event);
810 case IW_CM_EVENT_CONNECT_REPLY:
811 ret = cm_conn_rep_handler(cm_id_priv, iw_event);
813 case IW_CM_EVENT_ESTABLISHED:
814 ret = cm_conn_est_handler(cm_id_priv, iw_event);
816 case IW_CM_EVENT_DISCONNECT:
817 cm_disconnect_handler(cm_id_priv, iw_event);
819 case IW_CM_EVENT_CLOSE:
820 ret = cm_close_handler(cm_id_priv, iw_event);
830 * Process events on the work_list for the cm_id. If the callback
831 * function requests that the cm_id be deleted, a flag is set in the
832 * cm_id flags to indicate that when the last reference is
833 * removed, the cm_id is to be destroyed. This is necessary to
834 * distinguish between an object that will be destroyed by the app
835 * thread asleep on the destroy_comp list vs. an object destroyed
836 * here synchronously when the last reference is removed.
838 static void cm_work_handler(struct work_struct *_work)
840 struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
841 struct iw_cm_event levent;
842 struct iwcm_id_private *cm_id_priv = work->cm_id;
848 spin_lock_irqsave(&cm_id_priv->lock, flags);
849 empty = list_empty(&cm_id_priv->work_list);
851 work = list_entry(cm_id_priv->work_list.next,
852 struct iwcm_work, list);
853 list_del_init(&work->list);
854 empty = list_empty(&cm_id_priv->work_list);
855 levent = work->event;
857 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
859 ret = process_event(cm_id_priv, &levent);
861 set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
862 destroy_cm_id(&cm_id_priv->id);
864 BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
865 destroy_id = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
866 if (iwcm_deref_id(cm_id_priv)) {
868 BUG_ON(!list_empty(&cm_id_priv->work_list));
869 free_cm_id(cm_id_priv);
873 spin_lock_irqsave(&cm_id_priv->lock, flags);
875 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
879 * This function is called on interrupt context. Schedule events on
880 * the iwcm_wq thread to allow callback functions to downcall into
881 * the CM and/or block. Events are queued to a per-CM_ID
882 * work_list. If this is the first event on the work_list, the work
883 * element is also queued on the iwcm_wq thread.
885 * Each event holds a reference on the cm_id. Until the last posted
886 * event has been delivered and processed, the cm_id cannot be
890 * 0 - the event was handled.
891 * -ENOMEM - the event was not handled due to lack of resources.
893 static int cm_event_handler(struct iw_cm_id *cm_id,
894 struct iw_cm_event *iw_event)
896 struct iwcm_work *work;
897 struct iwcm_id_private *cm_id_priv;
901 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
903 spin_lock_irqsave(&cm_id_priv->lock, flags);
904 work = get_work(cm_id_priv);
910 INIT_WORK(&work->work, cm_work_handler);
911 work->cm_id = cm_id_priv;
912 work->event = *iw_event;
914 if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
915 work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
916 work->event.private_data_len) {
917 ret = copy_private_data(&work->event);
924 atomic_inc(&cm_id_priv->refcount);
925 if (list_empty(&cm_id_priv->work_list)) {
926 list_add_tail(&work->list, &cm_id_priv->work_list);
927 queue_work(iwcm_wq, &work->work);
929 list_add_tail(&work->list, &cm_id_priv->work_list);
931 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
935 static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
936 struct ib_qp_attr *qp_attr,
942 spin_lock_irqsave(&cm_id_priv->lock, flags);
943 switch (cm_id_priv->state) {
944 case IW_CM_STATE_IDLE:
945 case IW_CM_STATE_CONN_SENT:
946 case IW_CM_STATE_CONN_RECV:
947 case IW_CM_STATE_ESTABLISHED:
948 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
949 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
950 IB_ACCESS_REMOTE_READ;
957 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
961 static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
962 struct ib_qp_attr *qp_attr,
968 spin_lock_irqsave(&cm_id_priv->lock, flags);
969 switch (cm_id_priv->state) {
970 case IW_CM_STATE_IDLE:
971 case IW_CM_STATE_CONN_SENT:
972 case IW_CM_STATE_CONN_RECV:
973 case IW_CM_STATE_ESTABLISHED:
981 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
985 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
986 struct ib_qp_attr *qp_attr,
989 struct iwcm_id_private *cm_id_priv;
992 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
993 switch (qp_attr->qp_state) {
996 ret = iwcm_init_qp_init_attr(cm_id_priv,
997 qp_attr, qp_attr_mask);
1000 ret = iwcm_init_qp_rts_attr(cm_id_priv,
1001 qp_attr, qp_attr_mask);
1009 EXPORT_SYMBOL(iw_cm_init_qp_attr);
1011 static int __init iw_cm_init(void)
1013 iwcm_wq = create_singlethread_workqueue("iw_cm_wq");
1020 static void __exit iw_cm_cleanup(void)
1022 destroy_workqueue(iwcm_wq);
1025 module_init(iw_cm_init);
1026 module_exit(iw_cm_cleanup);