2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
5 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
7 * This Software is licensed under one of the following licenses:
9 * 1) under the terms of the "Common Public License 1.0" a copy of which is
10 * available from the Open Source Initiative, see
11 * http://www.opensource.org/licenses/cpl.php.
13 * 2) under the terms of the "The BSD License" a copy of which is
14 * available from the Open Source Initiative, see
15 * http://www.opensource.org/licenses/bsd-license.php.
17 * 3) under the terms of the "GNU General Public License (GPL) Version 2" a
18 * copy of which is available from the Open Source Initiative, see
19 * http://www.opensource.org/licenses/gpl-license.php.
21 * Licensee has the right to choose one of the above licenses.
23 * Redistributions of source code must retain the above copyright
24 * notice and one of the license notices.
26 * Redistributions in binary form must reproduce both the above copyright
27 * notice, one of the license notices in the documentation
28 * and/or other materials provided with the distribution.
32 #include <linux/completion.h>
34 #include <linux/in6.h>
35 #include <linux/mutex.h>
36 #include <linux/random.h>
37 #include <linux/idr.h>
38 #include <linux/inetdevice.h>
42 #include <rdma/rdma_cm.h>
43 #include <rdma/rdma_cm_ib.h>
44 #include <rdma/ib_cache.h>
45 #include <rdma/ib_cm.h>
46 #include <rdma/ib_sa.h>
47 #include <rdma/iw_cm.h>
49 MODULE_AUTHOR("Sean Hefty");
50 MODULE_DESCRIPTION("Generic RDMA CM Agent");
51 MODULE_LICENSE("Dual BSD/GPL");
53 #define CMA_CM_RESPONSE_TIMEOUT 20
54 #define CMA_MAX_CM_RETRIES 15
56 static void cma_add_one(struct ib_device *device);
57 static void cma_remove_one(struct ib_device *device);
59 static struct ib_client cma_client = {
62 .remove = cma_remove_one
65 static struct ib_sa_client sa_client;
66 static struct rdma_addr_client addr_client;
67 static LIST_HEAD(dev_list);
68 static LIST_HEAD(listen_any_list);
69 static DEFINE_MUTEX(lock);
70 static struct workqueue_struct *cma_wq;
71 static DEFINE_IDR(sdp_ps);
72 static DEFINE_IDR(tcp_ps);
73 static DEFINE_IDR(udp_ps);
76 struct list_head list;
77 struct ib_device *device;
79 struct completion comp;
81 struct list_head id_list;
98 struct rdma_bind_list {
100 struct hlist_head owners;
105 * Device removal can occur at anytime, so we need extra handling to
106 * serialize notifying the user of device removal with other callbacks.
107 * We do this by disabling removal notification while a callback is in process,
108 * and reporting it after the callback completes.
110 struct rdma_id_private {
111 struct rdma_cm_id id;
113 struct rdma_bind_list *bind_list;
114 struct hlist_node node;
115 struct list_head list;
116 struct list_head listen_list;
117 struct cma_device *cma_dev;
119 enum cma_state state;
121 struct completion comp;
123 wait_queue_head_t wait_remove;
128 struct ib_sa_query *query;
141 struct work_struct work;
142 struct rdma_id_private *id;
143 enum cma_state old_state;
144 enum cma_state new_state;
145 struct rdma_cm_event event;
158 u8 ip_version; /* IP version: 7:4 */
160 union cma_ip_addr src_addr;
161 union cma_ip_addr dst_addr;
166 u8 sdp_version; /* Major version: 7:4 */
167 u8 ip_version; /* IP version: 7:4 */
168 u8 sdp_specific1[10];
171 union cma_ip_addr src_addr;
172 union cma_ip_addr dst_addr;
180 #define CMA_VERSION 0x00
181 #define SDP_MAJ_VERSION 0x2
183 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
188 spin_lock_irqsave(&id_priv->lock, flags);
189 ret = (id_priv->state == comp);
190 spin_unlock_irqrestore(&id_priv->lock, flags);
194 static int cma_comp_exch(struct rdma_id_private *id_priv,
195 enum cma_state comp, enum cma_state exch)
200 spin_lock_irqsave(&id_priv->lock, flags);
201 if ((ret = (id_priv->state == comp)))
202 id_priv->state = exch;
203 spin_unlock_irqrestore(&id_priv->lock, flags);
207 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
213 spin_lock_irqsave(&id_priv->lock, flags);
214 old = id_priv->state;
215 id_priv->state = exch;
216 spin_unlock_irqrestore(&id_priv->lock, flags);
220 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
222 return hdr->ip_version >> 4;
225 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
227 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
230 static inline u8 sdp_get_majv(u8 sdp_version)
232 return sdp_version >> 4;
235 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
237 return hh->ip_version >> 4;
240 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
242 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
245 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
246 struct cma_device *cma_dev)
248 atomic_inc(&cma_dev->refcount);
249 id_priv->cma_dev = cma_dev;
250 id_priv->id.device = cma_dev->device;
251 list_add_tail(&id_priv->list, &cma_dev->id_list);
254 static inline void cma_deref_dev(struct cma_device *cma_dev)
256 if (atomic_dec_and_test(&cma_dev->refcount))
257 complete(&cma_dev->comp);
260 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
262 list_del(&id_priv->list);
263 cma_deref_dev(id_priv->cma_dev);
264 id_priv->cma_dev = NULL;
267 static int cma_acquire_dev(struct rdma_id_private *id_priv)
269 enum rdma_node_type dev_type = id_priv->id.route.addr.dev_addr.dev_type;
270 struct cma_device *cma_dev;
274 switch (rdma_node_get_transport(dev_type)) {
275 case RDMA_TRANSPORT_IB:
276 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
278 case RDMA_TRANSPORT_IWARP:
279 iw_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
285 list_for_each_entry(cma_dev, &dev_list, list) {
286 ret = ib_find_cached_gid(cma_dev->device, &gid,
287 &id_priv->id.port_num, NULL);
289 cma_attach_to_dev(id_priv, cma_dev);
296 static void cma_deref_id(struct rdma_id_private *id_priv)
298 if (atomic_dec_and_test(&id_priv->refcount))
299 complete(&id_priv->comp);
302 static void cma_release_remove(struct rdma_id_private *id_priv)
304 if (atomic_dec_and_test(&id_priv->dev_remove))
305 wake_up(&id_priv->wait_remove);
308 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
309 void *context, enum rdma_port_space ps)
311 struct rdma_id_private *id_priv;
313 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
315 return ERR_PTR(-ENOMEM);
317 id_priv->state = CMA_IDLE;
318 id_priv->id.context = context;
319 id_priv->id.event_handler = event_handler;
321 spin_lock_init(&id_priv->lock);
322 init_completion(&id_priv->comp);
323 atomic_set(&id_priv->refcount, 1);
324 init_waitqueue_head(&id_priv->wait_remove);
325 atomic_set(&id_priv->dev_remove, 0);
326 INIT_LIST_HEAD(&id_priv->listen_list);
327 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
331 EXPORT_SYMBOL(rdma_create_id);
333 static int cma_init_ib_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
335 struct ib_qp_attr qp_attr;
336 struct rdma_dev_addr *dev_addr;
339 dev_addr = &id_priv->id.route.addr.dev_addr;
340 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
341 ib_addr_get_pkey(dev_addr),
342 &qp_attr.pkey_index);
346 qp_attr.qp_state = IB_QPS_INIT;
347 qp_attr.qp_access_flags = 0;
348 qp_attr.port_num = id_priv->id.port_num;
349 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS |
350 IB_QP_PKEY_INDEX | IB_QP_PORT);
353 static int cma_init_iw_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
355 struct ib_qp_attr qp_attr;
357 qp_attr.qp_state = IB_QPS_INIT;
358 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
360 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS);
363 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
364 struct ib_qp_init_attr *qp_init_attr)
366 struct rdma_id_private *id_priv;
370 id_priv = container_of(id, struct rdma_id_private, id);
371 if (id->device != pd->device)
374 qp = ib_create_qp(pd, qp_init_attr);
378 switch (rdma_node_get_transport(id->device->node_type)) {
379 case RDMA_TRANSPORT_IB:
380 ret = cma_init_ib_qp(id_priv, qp);
382 case RDMA_TRANSPORT_IWARP:
383 ret = cma_init_iw_qp(id_priv, qp);
394 id_priv->qp_num = qp->qp_num;
395 id_priv->srq = (qp->srq != NULL);
401 EXPORT_SYMBOL(rdma_create_qp);
403 void rdma_destroy_qp(struct rdma_cm_id *id)
405 ib_destroy_qp(id->qp);
407 EXPORT_SYMBOL(rdma_destroy_qp);
409 static int cma_modify_qp_rtr(struct rdma_cm_id *id)
411 struct ib_qp_attr qp_attr;
412 int qp_attr_mask, ret;
417 /* Need to update QP attributes from default values. */
418 qp_attr.qp_state = IB_QPS_INIT;
419 ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
423 ret = ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
427 qp_attr.qp_state = IB_QPS_RTR;
428 ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
432 return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
435 static int cma_modify_qp_rts(struct rdma_cm_id *id)
437 struct ib_qp_attr qp_attr;
438 int qp_attr_mask, ret;
443 qp_attr.qp_state = IB_QPS_RTS;
444 ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
448 return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
451 static int cma_modify_qp_err(struct rdma_cm_id *id)
453 struct ib_qp_attr qp_attr;
458 qp_attr.qp_state = IB_QPS_ERR;
459 return ib_modify_qp(id->qp, &qp_attr, IB_QP_STATE);
462 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
465 struct rdma_id_private *id_priv;
468 id_priv = container_of(id, struct rdma_id_private, id);
469 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
470 case RDMA_TRANSPORT_IB:
471 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
473 if (qp_attr->qp_state == IB_QPS_RTR)
474 qp_attr->rq_psn = id_priv->seq_num;
476 case RDMA_TRANSPORT_IWARP:
477 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
487 EXPORT_SYMBOL(rdma_init_qp_attr);
489 static inline int cma_zero_addr(struct sockaddr *addr)
491 struct in6_addr *ip6;
493 if (addr->sa_family == AF_INET)
494 return ZERONET(((struct sockaddr_in *) addr)->sin_addr.s_addr);
496 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
497 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
498 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
502 static inline int cma_loopback_addr(struct sockaddr *addr)
504 return LOOPBACK(((struct sockaddr_in *) addr)->sin_addr.s_addr);
507 static inline int cma_any_addr(struct sockaddr *addr)
509 return cma_zero_addr(addr) || cma_loopback_addr(addr);
512 static inline __be16 cma_port(struct sockaddr *addr)
514 if (addr->sa_family == AF_INET)
515 return ((struct sockaddr_in *) addr)->sin_port;
517 return ((struct sockaddr_in6 *) addr)->sin6_port;
520 static inline int cma_any_port(struct sockaddr *addr)
522 return !cma_port(addr);
525 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
526 u8 *ip_ver, __u16 *port,
527 union cma_ip_addr **src, union cma_ip_addr **dst)
531 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
535 *ip_ver = sdp_get_ip_ver(hdr);
536 *port = ((struct sdp_hh *) hdr)->port;
537 *src = &((struct sdp_hh *) hdr)->src_addr;
538 *dst = &((struct sdp_hh *) hdr)->dst_addr;
541 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
544 *ip_ver = cma_get_ip_ver(hdr);
545 *port = ((struct cma_hdr *) hdr)->port;
546 *src = &((struct cma_hdr *) hdr)->src_addr;
547 *dst = &((struct cma_hdr *) hdr)->dst_addr;
551 if (*ip_ver != 4 && *ip_ver != 6)
556 static void cma_save_net_info(struct rdma_addr *addr,
557 struct rdma_addr *listen_addr,
558 u8 ip_ver, __u16 port,
559 union cma_ip_addr *src, union cma_ip_addr *dst)
561 struct sockaddr_in *listen4, *ip4;
562 struct sockaddr_in6 *listen6, *ip6;
566 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
567 ip4 = (struct sockaddr_in *) &addr->src_addr;
568 ip4->sin_family = listen4->sin_family;
569 ip4->sin_addr.s_addr = dst->ip4.addr;
570 ip4->sin_port = listen4->sin_port;
572 ip4 = (struct sockaddr_in *) &addr->dst_addr;
573 ip4->sin_family = listen4->sin_family;
574 ip4->sin_addr.s_addr = src->ip4.addr;
575 ip4->sin_port = port;
578 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
579 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
580 ip6->sin6_family = listen6->sin6_family;
581 ip6->sin6_addr = dst->ip6;
582 ip6->sin6_port = listen6->sin6_port;
584 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
585 ip6->sin6_family = listen6->sin6_family;
586 ip6->sin6_addr = src->ip6;
587 ip6->sin6_port = port;
594 static inline int cma_user_data_offset(enum rdma_port_space ps)
600 return sizeof(struct cma_hdr);
604 static void cma_cancel_route(struct rdma_id_private *id_priv)
606 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
607 case RDMA_TRANSPORT_IB:
609 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
616 static inline int cma_internal_listen(struct rdma_id_private *id_priv)
618 return (id_priv->state == CMA_LISTEN) && id_priv->cma_dev &&
619 cma_any_addr(&id_priv->id.route.addr.src_addr);
622 static void cma_destroy_listen(struct rdma_id_private *id_priv)
624 cma_exch(id_priv, CMA_DESTROYING);
626 if (id_priv->cma_dev) {
627 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
628 case RDMA_TRANSPORT_IB:
629 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
630 ib_destroy_cm_id(id_priv->cm_id.ib);
632 case RDMA_TRANSPORT_IWARP:
633 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
634 iw_destroy_cm_id(id_priv->cm_id.iw);
639 cma_detach_from_dev(id_priv);
641 list_del(&id_priv->listen_list);
643 cma_deref_id(id_priv);
644 wait_for_completion(&id_priv->comp);
649 static void cma_cancel_listens(struct rdma_id_private *id_priv)
651 struct rdma_id_private *dev_id_priv;
654 list_del(&id_priv->list);
656 while (!list_empty(&id_priv->listen_list)) {
657 dev_id_priv = list_entry(id_priv->listen_list.next,
658 struct rdma_id_private, listen_list);
659 cma_destroy_listen(dev_id_priv);
664 static void cma_cancel_operation(struct rdma_id_private *id_priv,
665 enum cma_state state)
669 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
671 case CMA_ROUTE_QUERY:
672 cma_cancel_route(id_priv);
675 if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
677 cma_cancel_listens(id_priv);
684 static void cma_release_port(struct rdma_id_private *id_priv)
686 struct rdma_bind_list *bind_list = id_priv->bind_list;
692 hlist_del(&id_priv->node);
693 if (hlist_empty(&bind_list->owners)) {
694 idr_remove(bind_list->ps, bind_list->port);
700 void rdma_destroy_id(struct rdma_cm_id *id)
702 struct rdma_id_private *id_priv;
703 enum cma_state state;
705 id_priv = container_of(id, struct rdma_id_private, id);
706 state = cma_exch(id_priv, CMA_DESTROYING);
707 cma_cancel_operation(id_priv, state);
710 if (id_priv->cma_dev) {
712 switch (rdma_node_get_transport(id->device->node_type)) {
713 case RDMA_TRANSPORT_IB:
714 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
715 ib_destroy_cm_id(id_priv->cm_id.ib);
717 case RDMA_TRANSPORT_IWARP:
718 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
719 iw_destroy_cm_id(id_priv->cm_id.iw);
725 cma_detach_from_dev(id_priv);
729 cma_release_port(id_priv);
730 cma_deref_id(id_priv);
731 wait_for_completion(&id_priv->comp);
733 kfree(id_priv->id.route.path_rec);
736 EXPORT_SYMBOL(rdma_destroy_id);
738 static int cma_rep_recv(struct rdma_id_private *id_priv)
742 ret = cma_modify_qp_rtr(&id_priv->id);
746 ret = cma_modify_qp_rts(&id_priv->id);
750 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
756 cma_modify_qp_err(&id_priv->id);
757 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
762 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
764 if (id_priv->id.ps == RDMA_PS_SDP &&
765 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
772 static void cma_set_rep_event_data(struct rdma_cm_event *event,
773 struct ib_cm_rep_event_param *rep_data,
776 event->param.conn.private_data = private_data;
777 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
778 event->param.conn.responder_resources = rep_data->responder_resources;
779 event->param.conn.initiator_depth = rep_data->initiator_depth;
780 event->param.conn.flow_control = rep_data->flow_control;
781 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
782 event->param.conn.srq = rep_data->srq;
783 event->param.conn.qp_num = rep_data->remote_qpn;
786 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
788 struct rdma_id_private *id_priv = cm_id->context;
789 struct rdma_cm_event event;
792 atomic_inc(&id_priv->dev_remove);
793 if (!cma_comp(id_priv, CMA_CONNECT))
796 memset(&event, 0, sizeof event);
797 switch (ib_event->event) {
798 case IB_CM_REQ_ERROR:
799 case IB_CM_REP_ERROR:
800 event.event = RDMA_CM_EVENT_UNREACHABLE;
801 event.status = -ETIMEDOUT;
803 case IB_CM_REP_RECEIVED:
804 event.status = cma_verify_rep(id_priv, ib_event->private_data);
806 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
807 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
808 event.status = cma_rep_recv(id_priv);
809 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
810 RDMA_CM_EVENT_ESTABLISHED;
812 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
813 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
814 ib_event->private_data);
816 case IB_CM_RTU_RECEIVED:
817 case IB_CM_USER_ESTABLISHED:
818 event.event = RDMA_CM_EVENT_ESTABLISHED;
820 case IB_CM_DREQ_ERROR:
821 event.status = -ETIMEDOUT; /* fall through */
822 case IB_CM_DREQ_RECEIVED:
823 case IB_CM_DREP_RECEIVED:
824 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
826 event.event = RDMA_CM_EVENT_DISCONNECTED;
828 case IB_CM_TIMEWAIT_EXIT:
829 case IB_CM_MRA_RECEIVED:
832 case IB_CM_REJ_RECEIVED:
833 cma_modify_qp_err(&id_priv->id);
834 event.status = ib_event->param.rej_rcvd.reason;
835 event.event = RDMA_CM_EVENT_REJECTED;
836 event.param.conn.private_data = ib_event->private_data;
837 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
840 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
845 ret = id_priv->id.event_handler(&id_priv->id, &event);
847 /* Destroy the CM ID by returning a non-zero value. */
848 id_priv->cm_id.ib = NULL;
849 cma_exch(id_priv, CMA_DESTROYING);
850 cma_release_remove(id_priv);
851 rdma_destroy_id(&id_priv->id);
855 cma_release_remove(id_priv);
859 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
860 struct ib_cm_event *ib_event)
862 struct rdma_id_private *id_priv;
863 struct rdma_cm_id *id;
864 struct rdma_route *rt;
865 union cma_ip_addr *src, *dst;
869 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
870 &ip_ver, &port, &src, &dst))
873 id = rdma_create_id(listen_id->event_handler, listen_id->context,
878 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
879 ip_ver, port, src, dst);
882 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
883 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
888 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
889 if (rt->num_paths == 2)
890 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
892 ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
893 ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
894 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
895 rt->addr.dev_addr.dev_type = RDMA_NODE_IB_CA;
897 id_priv = container_of(id, struct rdma_id_private, id);
898 id_priv->state = CMA_CONNECT;
907 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
908 struct ib_cm_event *ib_event)
910 struct rdma_id_private *id_priv;
911 struct rdma_cm_id *id;
912 union cma_ip_addr *src, *dst;
917 id = rdma_create_id(listen_id->event_handler, listen_id->context,
923 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
924 &ip_ver, &port, &src, &dst))
927 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
928 ip_ver, port, src, dst);
930 ret = rdma_translate_ip(&id->route.addr.src_addr,
931 &id->route.addr.dev_addr);
935 id_priv = container_of(id, struct rdma_id_private, id);
936 id_priv->state = CMA_CONNECT;
943 static void cma_set_req_event_data(struct rdma_cm_event *event,
944 struct ib_cm_req_event_param *req_data,
945 void *private_data, int offset)
947 event->param.conn.private_data = private_data + offset;
948 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
949 event->param.conn.responder_resources = req_data->responder_resources;
950 event->param.conn.initiator_depth = req_data->initiator_depth;
951 event->param.conn.flow_control = req_data->flow_control;
952 event->param.conn.retry_count = req_data->retry_count;
953 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
954 event->param.conn.srq = req_data->srq;
955 event->param.conn.qp_num = req_data->remote_qpn;
958 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
960 struct rdma_id_private *listen_id, *conn_id;
961 struct rdma_cm_event event;
964 listen_id = cm_id->context;
965 atomic_inc(&listen_id->dev_remove);
966 if (!cma_comp(listen_id, CMA_LISTEN)) {
971 memset(&event, 0, sizeof event);
972 offset = cma_user_data_offset(listen_id->id.ps);
973 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
974 if (listen_id->id.ps == RDMA_PS_UDP) {
975 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
976 event.param.ud.private_data = ib_event->private_data + offset;
977 event.param.ud.private_data_len =
978 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
980 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
981 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
982 ib_event->private_data, offset);
989 atomic_inc(&conn_id->dev_remove);
991 ret = cma_acquire_dev(conn_id);
994 goto release_conn_id;
996 conn_id->cm_id.ib = cm_id;
997 cm_id->context = conn_id;
998 cm_id->cm_handler = cma_ib_handler;
1000 ret = conn_id->id.event_handler(&conn_id->id, &event);
1004 /* Destroy the CM ID by returning a non-zero value. */
1005 conn_id->cm_id.ib = NULL;
1008 cma_exch(conn_id, CMA_DESTROYING);
1009 cma_release_remove(conn_id);
1010 rdma_destroy_id(&conn_id->id);
1013 cma_release_remove(listen_id);
1017 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1019 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1022 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1023 struct ib_cm_compare_data *compare)
1025 struct cma_hdr *cma_data, *cma_mask;
1026 struct sdp_hh *sdp_data, *sdp_mask;
1028 struct in6_addr ip6_addr;
1030 memset(compare, 0, sizeof *compare);
1031 cma_data = (void *) compare->data;
1032 cma_mask = (void *) compare->mask;
1033 sdp_data = (void *) compare->data;
1034 sdp_mask = (void *) compare->mask;
1036 switch (addr->sa_family) {
1038 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1039 if (ps == RDMA_PS_SDP) {
1040 sdp_set_ip_ver(sdp_data, 4);
1041 sdp_set_ip_ver(sdp_mask, 0xF);
1042 sdp_data->dst_addr.ip4.addr = ip4_addr;
1043 sdp_mask->dst_addr.ip4.addr = ~0;
1045 cma_set_ip_ver(cma_data, 4);
1046 cma_set_ip_ver(cma_mask, 0xF);
1047 cma_data->dst_addr.ip4.addr = ip4_addr;
1048 cma_mask->dst_addr.ip4.addr = ~0;
1052 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1053 if (ps == RDMA_PS_SDP) {
1054 sdp_set_ip_ver(sdp_data, 6);
1055 sdp_set_ip_ver(sdp_mask, 0xF);
1056 sdp_data->dst_addr.ip6 = ip6_addr;
1057 memset(&sdp_mask->dst_addr.ip6, 0xFF,
1058 sizeof sdp_mask->dst_addr.ip6);
1060 cma_set_ip_ver(cma_data, 6);
1061 cma_set_ip_ver(cma_mask, 0xF);
1062 cma_data->dst_addr.ip6 = ip6_addr;
1063 memset(&cma_mask->dst_addr.ip6, 0xFF,
1064 sizeof cma_mask->dst_addr.ip6);
1072 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1074 struct rdma_id_private *id_priv = iw_id->context;
1075 struct rdma_cm_event event;
1076 struct sockaddr_in *sin;
1079 memset(&event, 0, sizeof event);
1080 atomic_inc(&id_priv->dev_remove);
1082 switch (iw_event->event) {
1083 case IW_CM_EVENT_CLOSE:
1084 event.event = RDMA_CM_EVENT_DISCONNECTED;
1086 case IW_CM_EVENT_CONNECT_REPLY:
1087 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1088 *sin = iw_event->local_addr;
1089 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1090 *sin = iw_event->remote_addr;
1091 if (iw_event->status)
1092 event.event = RDMA_CM_EVENT_REJECTED;
1094 event.event = RDMA_CM_EVENT_ESTABLISHED;
1096 case IW_CM_EVENT_ESTABLISHED:
1097 event.event = RDMA_CM_EVENT_ESTABLISHED;
1103 event.status = iw_event->status;
1104 event.param.conn.private_data = iw_event->private_data;
1105 event.param.conn.private_data_len = iw_event->private_data_len;
1106 ret = id_priv->id.event_handler(&id_priv->id, &event);
1108 /* Destroy the CM ID by returning a non-zero value. */
1109 id_priv->cm_id.iw = NULL;
1110 cma_exch(id_priv, CMA_DESTROYING);
1111 cma_release_remove(id_priv);
1112 rdma_destroy_id(&id_priv->id);
1116 cma_release_remove(id_priv);
1120 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1121 struct iw_cm_event *iw_event)
1123 struct rdma_cm_id *new_cm_id;
1124 struct rdma_id_private *listen_id, *conn_id;
1125 struct sockaddr_in *sin;
1126 struct net_device *dev = NULL;
1127 struct rdma_cm_event event;
1130 listen_id = cm_id->context;
1131 atomic_inc(&listen_id->dev_remove);
1132 if (!cma_comp(listen_id, CMA_LISTEN)) {
1133 ret = -ECONNABORTED;
1137 /* Create a new RDMA id for the new IW CM ID */
1138 new_cm_id = rdma_create_id(listen_id->id.event_handler,
1139 listen_id->id.context,
1145 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1146 atomic_inc(&conn_id->dev_remove);
1147 conn_id->state = CMA_CONNECT;
1149 dev = ip_dev_find(iw_event->local_addr.sin_addr.s_addr);
1151 ret = -EADDRNOTAVAIL;
1152 cma_release_remove(conn_id);
1153 rdma_destroy_id(new_cm_id);
1156 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1158 cma_release_remove(conn_id);
1159 rdma_destroy_id(new_cm_id);
1164 ret = cma_acquire_dev(conn_id);
1165 mutex_unlock(&lock);
1167 cma_release_remove(conn_id);
1168 rdma_destroy_id(new_cm_id);
1172 conn_id->cm_id.iw = cm_id;
1173 cm_id->context = conn_id;
1174 cm_id->cm_handler = cma_iw_handler;
1176 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1177 *sin = iw_event->local_addr;
1178 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1179 *sin = iw_event->remote_addr;
1181 memset(&event, 0, sizeof event);
1182 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1183 event.param.conn.private_data = iw_event->private_data;
1184 event.param.conn.private_data_len = iw_event->private_data_len;
1185 ret = conn_id->id.event_handler(&conn_id->id, &event);
1187 /* User wants to destroy the CM ID */
1188 conn_id->cm_id.iw = NULL;
1189 cma_exch(conn_id, CMA_DESTROYING);
1190 cma_release_remove(conn_id);
1191 rdma_destroy_id(&conn_id->id);
1197 cma_release_remove(listen_id);
1201 static int cma_ib_listen(struct rdma_id_private *id_priv)
1203 struct ib_cm_compare_data compare_data;
1204 struct sockaddr *addr;
1208 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1210 if (IS_ERR(id_priv->cm_id.ib))
1211 return PTR_ERR(id_priv->cm_id.ib);
1213 addr = &id_priv->id.route.addr.src_addr;
1214 svc_id = cma_get_service_id(id_priv->id.ps, addr);
1215 if (cma_any_addr(addr))
1216 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1218 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1219 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1223 ib_destroy_cm_id(id_priv->cm_id.ib);
1224 id_priv->cm_id.ib = NULL;
1230 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1233 struct sockaddr_in *sin;
1235 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1236 iw_conn_req_handler,
1238 if (IS_ERR(id_priv->cm_id.iw))
1239 return PTR_ERR(id_priv->cm_id.iw);
1241 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1242 id_priv->cm_id.iw->local_addr = *sin;
1244 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1247 iw_destroy_cm_id(id_priv->cm_id.iw);
1248 id_priv->cm_id.iw = NULL;
1254 static int cma_listen_handler(struct rdma_cm_id *id,
1255 struct rdma_cm_event *event)
1257 struct rdma_id_private *id_priv = id->context;
1259 id->context = id_priv->id.context;
1260 id->event_handler = id_priv->id.event_handler;
1261 return id_priv->id.event_handler(id, event);
1264 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1265 struct cma_device *cma_dev)
1267 struct rdma_id_private *dev_id_priv;
1268 struct rdma_cm_id *id;
1271 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1275 dev_id_priv = container_of(id, struct rdma_id_private, id);
1277 dev_id_priv->state = CMA_ADDR_BOUND;
1278 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1279 ip_addr_size(&id_priv->id.route.addr.src_addr));
1281 cma_attach_to_dev(dev_id_priv, cma_dev);
1282 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1284 ret = rdma_listen(id, id_priv->backlog);
1290 cma_destroy_listen(dev_id_priv);
1293 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1295 struct cma_device *cma_dev;
1298 list_add_tail(&id_priv->list, &listen_any_list);
1299 list_for_each_entry(cma_dev, &dev_list, list)
1300 cma_listen_on_dev(id_priv, cma_dev);
1301 mutex_unlock(&lock);
1304 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1306 struct sockaddr_in addr_in;
1308 memset(&addr_in, 0, sizeof addr_in);
1309 addr_in.sin_family = af;
1310 return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1313 int rdma_listen(struct rdma_cm_id *id, int backlog)
1315 struct rdma_id_private *id_priv;
1318 id_priv = container_of(id, struct rdma_id_private, id);
1319 if (id_priv->state == CMA_IDLE) {
1320 ret = cma_bind_any(id, AF_INET);
1325 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1328 id_priv->backlog = backlog;
1330 switch (rdma_node_get_transport(id->device->node_type)) {
1331 case RDMA_TRANSPORT_IB:
1332 ret = cma_ib_listen(id_priv);
1336 case RDMA_TRANSPORT_IWARP:
1337 ret = cma_iw_listen(id_priv, backlog);
1346 cma_listen_on_all(id_priv);
1350 id_priv->backlog = 0;
1351 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1354 EXPORT_SYMBOL(rdma_listen);
1356 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1359 struct cma_work *work = context;
1360 struct rdma_route *route;
1362 route = &work->id->id.route;
1365 route->num_paths = 1;
1366 *route->path_rec = *path_rec;
1368 work->old_state = CMA_ROUTE_QUERY;
1369 work->new_state = CMA_ADDR_RESOLVED;
1370 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1371 work->event.status = status;
1374 queue_work(cma_wq, &work->work);
1377 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1378 struct cma_work *work)
1380 struct rdma_dev_addr *addr = &id_priv->id.route.addr.dev_addr;
1381 struct ib_sa_path_rec path_rec;
1383 memset(&path_rec, 0, sizeof path_rec);
1384 ib_addr_get_sgid(addr, &path_rec.sgid);
1385 ib_addr_get_dgid(addr, &path_rec.dgid);
1386 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(addr));
1387 path_rec.numb_path = 1;
1389 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1390 id_priv->id.port_num, &path_rec,
1391 IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1392 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH,
1393 timeout_ms, GFP_KERNEL,
1394 cma_query_handler, work, &id_priv->query);
1396 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1399 static void cma_work_handler(struct work_struct *_work)
1401 struct cma_work *work = container_of(_work, struct cma_work, work);
1402 struct rdma_id_private *id_priv = work->id;
1405 atomic_inc(&id_priv->dev_remove);
1406 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1409 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1410 cma_exch(id_priv, CMA_DESTROYING);
1414 cma_release_remove(id_priv);
1415 cma_deref_id(id_priv);
1417 rdma_destroy_id(&id_priv->id);
1421 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1423 struct rdma_route *route = &id_priv->id.route;
1424 struct cma_work *work;
1427 work = kzalloc(sizeof *work, GFP_KERNEL);
1432 INIT_WORK(&work->work, cma_work_handler);
1433 work->old_state = CMA_ROUTE_QUERY;
1434 work->new_state = CMA_ROUTE_RESOLVED;
1435 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1437 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1438 if (!route->path_rec) {
1443 ret = cma_query_ib_route(id_priv, timeout_ms, work);
1449 kfree(route->path_rec);
1450 route->path_rec = NULL;
1456 int rdma_set_ib_paths(struct rdma_cm_id *id,
1457 struct ib_sa_path_rec *path_rec, int num_paths)
1459 struct rdma_id_private *id_priv;
1462 id_priv = container_of(id, struct rdma_id_private, id);
1463 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1466 id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1467 if (!id->route.path_rec) {
1472 memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1475 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1478 EXPORT_SYMBOL(rdma_set_ib_paths);
1480 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1482 struct cma_work *work;
1484 work = kzalloc(sizeof *work, GFP_KERNEL);
1489 INIT_WORK(&work->work, cma_work_handler);
1490 work->old_state = CMA_ROUTE_QUERY;
1491 work->new_state = CMA_ROUTE_RESOLVED;
1492 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1493 queue_work(cma_wq, &work->work);
1497 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1499 struct rdma_id_private *id_priv;
1502 id_priv = container_of(id, struct rdma_id_private, id);
1503 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1506 atomic_inc(&id_priv->refcount);
1507 switch (rdma_node_get_transport(id->device->node_type)) {
1508 case RDMA_TRANSPORT_IB:
1509 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1511 case RDMA_TRANSPORT_IWARP:
1512 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1523 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1524 cma_deref_id(id_priv);
1527 EXPORT_SYMBOL(rdma_resolve_route);
1529 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1531 struct cma_device *cma_dev;
1532 struct ib_port_attr port_attr;
1539 if (list_empty(&dev_list)) {
1543 list_for_each_entry(cma_dev, &dev_list, list)
1544 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1545 if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1546 port_attr.state == IB_PORT_ACTIVE)
1550 cma_dev = list_entry(dev_list.next, struct cma_device, list);
1553 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1557 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1561 ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1562 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1563 id_priv->id.port_num = p;
1564 cma_attach_to_dev(id_priv, cma_dev);
1566 mutex_unlock(&lock);
1570 static void addr_handler(int status, struct sockaddr *src_addr,
1571 struct rdma_dev_addr *dev_addr, void *context)
1573 struct rdma_id_private *id_priv = context;
1574 struct rdma_cm_event event;
1576 memset(&event, 0, sizeof event);
1577 atomic_inc(&id_priv->dev_remove);
1580 * Grab mutex to block rdma_destroy_id() from removing the device while
1581 * we're trying to acquire it.
1584 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1585 mutex_unlock(&lock);
1589 if (!status && !id_priv->cma_dev)
1590 status = cma_acquire_dev(id_priv);
1591 mutex_unlock(&lock);
1594 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1596 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1597 event.status = status;
1599 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1600 ip_addr_size(src_addr));
1601 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1604 if (id_priv->id.event_handler(&id_priv->id, &event)) {
1605 cma_exch(id_priv, CMA_DESTROYING);
1606 cma_release_remove(id_priv);
1607 cma_deref_id(id_priv);
1608 rdma_destroy_id(&id_priv->id);
1612 cma_release_remove(id_priv);
1613 cma_deref_id(id_priv);
1616 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1618 struct cma_work *work;
1619 struct sockaddr_in *src_in, *dst_in;
1623 work = kzalloc(sizeof *work, GFP_KERNEL);
1627 if (!id_priv->cma_dev) {
1628 ret = cma_bind_loopback(id_priv);
1633 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1634 ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1636 if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
1637 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1638 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1639 src_in->sin_family = dst_in->sin_family;
1640 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1644 INIT_WORK(&work->work, cma_work_handler);
1645 work->old_state = CMA_ADDR_QUERY;
1646 work->new_state = CMA_ADDR_RESOLVED;
1647 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1648 queue_work(cma_wq, &work->work);
1655 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1656 struct sockaddr *dst_addr)
1658 if (src_addr && src_addr->sa_family)
1659 return rdma_bind_addr(id, src_addr);
1661 return cma_bind_any(id, dst_addr->sa_family);
1664 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1665 struct sockaddr *dst_addr, int timeout_ms)
1667 struct rdma_id_private *id_priv;
1670 id_priv = container_of(id, struct rdma_id_private, id);
1671 if (id_priv->state == CMA_IDLE) {
1672 ret = cma_bind_addr(id, src_addr, dst_addr);
1677 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1680 atomic_inc(&id_priv->refcount);
1681 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1682 if (cma_any_addr(dst_addr))
1683 ret = cma_resolve_loopback(id_priv);
1685 ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
1686 dst_addr, &id->route.addr.dev_addr,
1687 timeout_ms, addr_handler, id_priv);
1693 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1694 cma_deref_id(id_priv);
1697 EXPORT_SYMBOL(rdma_resolve_addr);
1699 static void cma_bind_port(struct rdma_bind_list *bind_list,
1700 struct rdma_id_private *id_priv)
1702 struct sockaddr_in *sin;
1704 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1705 sin->sin_port = htons(bind_list->port);
1706 id_priv->bind_list = bind_list;
1707 hlist_add_head(&id_priv->node, &bind_list->owners);
1710 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1711 unsigned short snum)
1713 struct rdma_bind_list *bind_list;
1714 int port, start, ret;
1716 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1720 start = snum ? snum : sysctl_local_port_range[0];
1723 ret = idr_get_new_above(ps, bind_list, start, &port);
1724 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1729 if ((snum && port != snum) ||
1730 (!snum && port > sysctl_local_port_range[1])) {
1731 idr_remove(ps, port);
1732 ret = -EADDRNOTAVAIL;
1737 bind_list->port = (unsigned short) port;
1738 cma_bind_port(bind_list, id_priv);
1745 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
1747 struct rdma_id_private *cur_id;
1748 struct sockaddr_in *sin, *cur_sin;
1749 struct rdma_bind_list *bind_list;
1750 struct hlist_node *node;
1751 unsigned short snum;
1753 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1754 snum = ntohs(sin->sin_port);
1755 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
1758 bind_list = idr_find(ps, snum);
1760 return cma_alloc_port(ps, id_priv, snum);
1763 * We don't support binding to any address if anyone is bound to
1764 * a specific address on the same port.
1766 if (cma_any_addr(&id_priv->id.route.addr.src_addr))
1767 return -EADDRNOTAVAIL;
1769 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
1770 if (cma_any_addr(&cur_id->id.route.addr.src_addr))
1771 return -EADDRNOTAVAIL;
1773 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
1774 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
1778 cma_bind_port(bind_list, id_priv);
1782 static int cma_get_port(struct rdma_id_private *id_priv)
1787 switch (id_priv->id.ps) {
1798 return -EPROTONOSUPPORT;
1802 if (cma_any_port(&id_priv->id.route.addr.src_addr))
1803 ret = cma_alloc_port(ps, id_priv, 0);
1805 ret = cma_use_port(ps, id_priv);
1806 mutex_unlock(&lock);
1811 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
1813 struct rdma_id_private *id_priv;
1816 if (addr->sa_family != AF_INET)
1817 return -EAFNOSUPPORT;
1819 id_priv = container_of(id, struct rdma_id_private, id);
1820 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
1823 if (!cma_any_addr(addr)) {
1824 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
1829 ret = cma_acquire_dev(id_priv);
1830 mutex_unlock(&lock);
1835 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
1836 ret = cma_get_port(id_priv);
1842 if (!cma_any_addr(addr)) {
1844 cma_detach_from_dev(id_priv);
1845 mutex_unlock(&lock);
1848 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
1851 EXPORT_SYMBOL(rdma_bind_addr);
1853 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
1854 struct rdma_route *route)
1856 struct sockaddr_in *src4, *dst4;
1857 struct cma_hdr *cma_hdr;
1858 struct sdp_hh *sdp_hdr;
1860 src4 = (struct sockaddr_in *) &route->addr.src_addr;
1861 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
1866 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
1868 sdp_set_ip_ver(sdp_hdr, 4);
1869 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
1870 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
1871 sdp_hdr->port = src4->sin_port;
1875 cma_hdr->cma_version = CMA_VERSION;
1876 cma_set_ip_ver(cma_hdr, 4);
1877 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
1878 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
1879 cma_hdr->port = src4->sin_port;
1885 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
1886 struct ib_cm_event *ib_event)
1888 struct rdma_id_private *id_priv = cm_id->context;
1889 struct rdma_cm_event event;
1890 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
1893 memset(&event, 0, sizeof event);
1894 atomic_inc(&id_priv->dev_remove);
1895 if (!cma_comp(id_priv, CMA_CONNECT))
1898 switch (ib_event->event) {
1899 case IB_CM_SIDR_REQ_ERROR:
1900 event.event = RDMA_CM_EVENT_UNREACHABLE;
1901 event.status = -ETIMEDOUT;
1903 case IB_CM_SIDR_REP_RECEIVED:
1904 event.param.ud.private_data = ib_event->private_data;
1905 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
1906 if (rep->status != IB_SIDR_SUCCESS) {
1907 event.event = RDMA_CM_EVENT_UNREACHABLE;
1908 event.status = ib_event->param.sidr_rep_rcvd.status;
1911 if (rep->qkey != RDMA_UD_QKEY) {
1912 event.event = RDMA_CM_EVENT_UNREACHABLE;
1913 event.status = -EINVAL;
1916 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
1917 id_priv->id.route.path_rec,
1918 &event.param.ud.ah_attr);
1919 event.param.ud.qp_num = rep->qpn;
1920 event.param.ud.qkey = rep->qkey;
1921 event.event = RDMA_CM_EVENT_ESTABLISHED;
1925 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
1930 ret = id_priv->id.event_handler(&id_priv->id, &event);
1932 /* Destroy the CM ID by returning a non-zero value. */
1933 id_priv->cm_id.ib = NULL;
1934 cma_exch(id_priv, CMA_DESTROYING);
1935 cma_release_remove(id_priv);
1936 rdma_destroy_id(&id_priv->id);
1940 cma_release_remove(id_priv);
1944 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
1945 struct rdma_conn_param *conn_param)
1947 struct ib_cm_sidr_req_param req;
1948 struct rdma_route *route;
1951 req.private_data_len = sizeof(struct cma_hdr) +
1952 conn_param->private_data_len;
1953 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
1954 if (!req.private_data)
1957 if (conn_param->private_data && conn_param->private_data_len)
1958 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
1959 conn_param->private_data, conn_param->private_data_len);
1961 route = &id_priv->id.route;
1962 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
1966 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
1967 cma_sidr_rep_handler, id_priv);
1968 if (IS_ERR(id_priv->cm_id.ib)) {
1969 ret = PTR_ERR(id_priv->cm_id.ib);
1973 req.path = route->path_rec;
1974 req.service_id = cma_get_service_id(id_priv->id.ps,
1975 &route->addr.dst_addr);
1976 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
1977 req.max_cm_retries = CMA_MAX_CM_RETRIES;
1979 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
1981 ib_destroy_cm_id(id_priv->cm_id.ib);
1982 id_priv->cm_id.ib = NULL;
1985 kfree(req.private_data);
1989 static int cma_connect_ib(struct rdma_id_private *id_priv,
1990 struct rdma_conn_param *conn_param)
1992 struct ib_cm_req_param req;
1993 struct rdma_route *route;
1997 memset(&req, 0, sizeof req);
1998 offset = cma_user_data_offset(id_priv->id.ps);
1999 req.private_data_len = offset + conn_param->private_data_len;
2000 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2004 if (conn_param->private_data && conn_param->private_data_len)
2005 memcpy(private_data + offset, conn_param->private_data,
2006 conn_param->private_data_len);
2008 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2010 if (IS_ERR(id_priv->cm_id.ib)) {
2011 ret = PTR_ERR(id_priv->cm_id.ib);
2015 route = &id_priv->id.route;
2016 ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2019 req.private_data = private_data;
2021 req.primary_path = &route->path_rec[0];
2022 if (route->num_paths == 2)
2023 req.alternate_path = &route->path_rec[1];
2025 req.service_id = cma_get_service_id(id_priv->id.ps,
2026 &route->addr.dst_addr);
2027 req.qp_num = id_priv->qp_num;
2028 req.qp_type = IB_QPT_RC;
2029 req.starting_psn = id_priv->seq_num;
2030 req.responder_resources = conn_param->responder_resources;
2031 req.initiator_depth = conn_param->initiator_depth;
2032 req.flow_control = conn_param->flow_control;
2033 req.retry_count = conn_param->retry_count;
2034 req.rnr_retry_count = conn_param->rnr_retry_count;
2035 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2036 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2037 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2038 req.srq = id_priv->srq ? 1 : 0;
2040 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2042 if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2043 ib_destroy_cm_id(id_priv->cm_id.ib);
2044 id_priv->cm_id.ib = NULL;
2047 kfree(private_data);
2051 static int cma_connect_iw(struct rdma_id_private *id_priv,
2052 struct rdma_conn_param *conn_param)
2054 struct iw_cm_id *cm_id;
2055 struct sockaddr_in* sin;
2057 struct iw_cm_conn_param iw_param;
2059 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2060 if (IS_ERR(cm_id)) {
2061 ret = PTR_ERR(cm_id);
2065 id_priv->cm_id.iw = cm_id;
2067 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2068 cm_id->local_addr = *sin;
2070 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2071 cm_id->remote_addr = *sin;
2073 ret = cma_modify_qp_rtr(&id_priv->id);
2077 iw_param.ord = conn_param->initiator_depth;
2078 iw_param.ird = conn_param->responder_resources;
2079 iw_param.private_data = conn_param->private_data;
2080 iw_param.private_data_len = conn_param->private_data_len;
2082 iw_param.qpn = id_priv->qp_num;
2084 iw_param.qpn = conn_param->qp_num;
2085 ret = iw_cm_connect(cm_id, &iw_param);
2087 if (ret && !IS_ERR(cm_id)) {
2088 iw_destroy_cm_id(cm_id);
2089 id_priv->cm_id.iw = NULL;
2094 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2096 struct rdma_id_private *id_priv;
2099 id_priv = container_of(id, struct rdma_id_private, id);
2100 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2104 id_priv->qp_num = conn_param->qp_num;
2105 id_priv->srq = conn_param->srq;
2108 switch (rdma_node_get_transport(id->device->node_type)) {
2109 case RDMA_TRANSPORT_IB:
2110 if (id->ps == RDMA_PS_UDP)
2111 ret = cma_resolve_ib_udp(id_priv, conn_param);
2113 ret = cma_connect_ib(id_priv, conn_param);
2115 case RDMA_TRANSPORT_IWARP:
2116 ret = cma_connect_iw(id_priv, conn_param);
2127 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2130 EXPORT_SYMBOL(rdma_connect);
2132 static int cma_accept_ib(struct rdma_id_private *id_priv,
2133 struct rdma_conn_param *conn_param)
2135 struct ib_cm_rep_param rep;
2136 struct ib_qp_attr qp_attr;
2137 int qp_attr_mask, ret;
2139 if (id_priv->id.qp) {
2140 ret = cma_modify_qp_rtr(&id_priv->id);
2144 qp_attr.qp_state = IB_QPS_RTS;
2145 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, &qp_attr,
2150 qp_attr.max_rd_atomic = conn_param->initiator_depth;
2151 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
2156 memset(&rep, 0, sizeof rep);
2157 rep.qp_num = id_priv->qp_num;
2158 rep.starting_psn = id_priv->seq_num;
2159 rep.private_data = conn_param->private_data;
2160 rep.private_data_len = conn_param->private_data_len;
2161 rep.responder_resources = conn_param->responder_resources;
2162 rep.initiator_depth = conn_param->initiator_depth;
2163 rep.target_ack_delay = CMA_CM_RESPONSE_TIMEOUT;
2164 rep.failover_accepted = 0;
2165 rep.flow_control = conn_param->flow_control;
2166 rep.rnr_retry_count = conn_param->rnr_retry_count;
2167 rep.srq = id_priv->srq ? 1 : 0;
2169 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2174 static int cma_accept_iw(struct rdma_id_private *id_priv,
2175 struct rdma_conn_param *conn_param)
2177 struct iw_cm_conn_param iw_param;
2180 ret = cma_modify_qp_rtr(&id_priv->id);
2184 iw_param.ord = conn_param->initiator_depth;
2185 iw_param.ird = conn_param->responder_resources;
2186 iw_param.private_data = conn_param->private_data;
2187 iw_param.private_data_len = conn_param->private_data_len;
2188 if (id_priv->id.qp) {
2189 iw_param.qpn = id_priv->qp_num;
2191 iw_param.qpn = conn_param->qp_num;
2193 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2196 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2197 enum ib_cm_sidr_status status,
2198 const void *private_data, int private_data_len)
2200 struct ib_cm_sidr_rep_param rep;
2202 memset(&rep, 0, sizeof rep);
2203 rep.status = status;
2204 if (status == IB_SIDR_SUCCESS) {
2205 rep.qp_num = id_priv->qp_num;
2206 rep.qkey = RDMA_UD_QKEY;
2208 rep.private_data = private_data;
2209 rep.private_data_len = private_data_len;
2211 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2214 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2216 struct rdma_id_private *id_priv;
2219 id_priv = container_of(id, struct rdma_id_private, id);
2220 if (!cma_comp(id_priv, CMA_CONNECT))
2223 if (!id->qp && conn_param) {
2224 id_priv->qp_num = conn_param->qp_num;
2225 id_priv->srq = conn_param->srq;
2228 switch (rdma_node_get_transport(id->device->node_type)) {
2229 case RDMA_TRANSPORT_IB:
2230 if (id->ps == RDMA_PS_UDP)
2231 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2232 conn_param->private_data,
2233 conn_param->private_data_len);
2234 else if (conn_param)
2235 ret = cma_accept_ib(id_priv, conn_param);
2237 ret = cma_rep_recv(id_priv);
2239 case RDMA_TRANSPORT_IWARP:
2240 ret = cma_accept_iw(id_priv, conn_param);
2252 cma_modify_qp_err(id);
2253 rdma_reject(id, NULL, 0);
2256 EXPORT_SYMBOL(rdma_accept);
2258 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2260 struct rdma_id_private *id_priv;
2263 id_priv = container_of(id, struct rdma_id_private, id);
2264 if (!cma_comp(id_priv, CMA_CONNECT))
2267 switch (id->device->node_type) {
2268 case RDMA_NODE_IB_CA:
2269 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2277 EXPORT_SYMBOL(rdma_notify);
2279 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2280 u8 private_data_len)
2282 struct rdma_id_private *id_priv;
2285 id_priv = container_of(id, struct rdma_id_private, id);
2286 if (!cma_comp(id_priv, CMA_CONNECT))
2289 switch (rdma_node_get_transport(id->device->node_type)) {
2290 case RDMA_TRANSPORT_IB:
2291 if (id->ps == RDMA_PS_UDP)
2292 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2293 private_data, private_data_len);
2295 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2296 IB_CM_REJ_CONSUMER_DEFINED, NULL,
2297 0, private_data, private_data_len);
2299 case RDMA_TRANSPORT_IWARP:
2300 ret = iw_cm_reject(id_priv->cm_id.iw,
2301 private_data, private_data_len);
2309 EXPORT_SYMBOL(rdma_reject);
2311 int rdma_disconnect(struct rdma_cm_id *id)
2313 struct rdma_id_private *id_priv;
2316 id_priv = container_of(id, struct rdma_id_private, id);
2317 if (!cma_comp(id_priv, CMA_CONNECT) &&
2318 !cma_comp(id_priv, CMA_DISCONNECT))
2321 switch (rdma_node_get_transport(id->device->node_type)) {
2322 case RDMA_TRANSPORT_IB:
2323 ret = cma_modify_qp_err(id);
2326 /* Initiate or respond to a disconnect. */
2327 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2328 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2330 case RDMA_TRANSPORT_IWARP:
2331 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2340 EXPORT_SYMBOL(rdma_disconnect);
2342 static void cma_add_one(struct ib_device *device)
2344 struct cma_device *cma_dev;
2345 struct rdma_id_private *id_priv;
2347 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2351 cma_dev->device = device;
2352 cma_dev->node_guid = device->node_guid;
2354 init_completion(&cma_dev->comp);
2355 atomic_set(&cma_dev->refcount, 1);
2356 INIT_LIST_HEAD(&cma_dev->id_list);
2357 ib_set_client_data(device, &cma_client, cma_dev);
2360 list_add_tail(&cma_dev->list, &dev_list);
2361 list_for_each_entry(id_priv, &listen_any_list, list)
2362 cma_listen_on_dev(id_priv, cma_dev);
2363 mutex_unlock(&lock);
2366 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2368 struct rdma_cm_event event;
2369 enum cma_state state;
2371 /* Record that we want to remove the device */
2372 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2373 if (state == CMA_DESTROYING)
2376 cma_cancel_operation(id_priv, state);
2377 wait_event(id_priv->wait_remove, !atomic_read(&id_priv->dev_remove));
2379 /* Check for destruction from another callback. */
2380 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2383 memset(&event, 0, sizeof event);
2384 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2385 return id_priv->id.event_handler(&id_priv->id, &event);
2388 static void cma_process_remove(struct cma_device *cma_dev)
2390 struct rdma_id_private *id_priv;
2394 while (!list_empty(&cma_dev->id_list)) {
2395 id_priv = list_entry(cma_dev->id_list.next,
2396 struct rdma_id_private, list);
2398 if (cma_internal_listen(id_priv)) {
2399 cma_destroy_listen(id_priv);
2403 list_del_init(&id_priv->list);
2404 atomic_inc(&id_priv->refcount);
2405 mutex_unlock(&lock);
2407 ret = cma_remove_id_dev(id_priv);
2408 cma_deref_id(id_priv);
2410 rdma_destroy_id(&id_priv->id);
2414 mutex_unlock(&lock);
2416 cma_deref_dev(cma_dev);
2417 wait_for_completion(&cma_dev->comp);
2420 static void cma_remove_one(struct ib_device *device)
2422 struct cma_device *cma_dev;
2424 cma_dev = ib_get_client_data(device, &cma_client);
2429 list_del(&cma_dev->list);
2430 mutex_unlock(&lock);
2432 cma_process_remove(cma_dev);
2436 static int cma_init(void)
2440 cma_wq = create_singlethread_workqueue("rdma_cm_wq");
2444 ib_sa_register_client(&sa_client);
2445 rdma_addr_register_client(&addr_client);
2447 ret = ib_register_client(&cma_client);
2453 rdma_addr_unregister_client(&addr_client);
2454 ib_sa_unregister_client(&sa_client);
2455 destroy_workqueue(cma_wq);
2459 static void cma_cleanup(void)
2461 ib_unregister_client(&cma_client);
2462 rdma_addr_unregister_client(&addr_client);
2463 ib_sa_unregister_client(&sa_client);
2464 destroy_workqueue(cma_wq);
2465 idr_destroy(&sdp_ps);
2466 idr_destroy(&tcp_ps);
2467 idr_destroy(&udp_ps);
2470 module_init(cma_init);
2471 module_exit(cma_cleanup);