[PATCH] IB: Add the kernel CM implementation

Add the kernel CM implementation
Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Hal Rosenstock <halr@voltaire.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/infiniband/core/Makefile

 EXTRA_CFLAGS += -Idrivers/infiniband/include
 
-obj-$(CONFIG_INFINIBAND) +=		ib_core.o ib_mad.o ib_sa.o ib_umad.o
+obj-$(CONFIG_INFINIBAND) +=		ib_core.o ib_mad.o ib_sa.o \
+					ib_cm.o ib_umad.o
 obj-$(CONFIG_INFINIBAND_USER_VERBS) +=	ib_uverbs.o
 
 ib_core-y :=			packer.o ud_header.o verbs.o sysfs.o \
@@ -10,6 +11,8 @@ ib_mad-y :=			mad.o smi.o agent.o mad_rmpp.o
 
 ib_sa-y :=			sa_query.o
 
+ib_cm-y :=			cm.o
+
 ib_umad-y :=			user_mad.o
 
 ib_uverbs-y :=			uverbs_main.o uverbs_cmd.o uverbs_mem.o

drivers/infiniband/core/cm.c

+/*
+ * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
+ * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
+ * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
+ * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id: cm.c 2821 2005-07-08 17:07:28Z sean.hefty $
+ */
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/idr.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/rbtree.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+
+#include <ib_cache.h>
+#include <ib_cm.h>
+#include "cm_msgs.h"
+
+MODULE_AUTHOR("Sean Hefty");
+MODULE_DESCRIPTION("InfiniBand CM");
+MODULE_LICENSE("Dual BSD/GPL");
+
+static void cm_add_one(struct ib_device *device);
+static void cm_remove_one(struct ib_device *device);
+
+static struct ib_client cm_client = {
+	.name   = "cm",
+	.add    = cm_add_one,
+	.remove = cm_remove_one
+};
+
+static struct ib_cm {
+	spinlock_t lock;
+	struct list_head device_list;
+	rwlock_t device_lock;
+	struct rb_root listen_service_table;
+	u64 listen_service_id;
+	/* struct rb_root peer_service_table; todo: fix peer to peer */
+	struct rb_root remote_qp_table;
+	struct rb_root remote_id_table;
+	struct rb_root remote_sidr_table;
+	struct idr local_id_table;
+	struct workqueue_struct *wq;
+} cm;
+
+struct cm_port {
+	struct cm_device *cm_dev;
+	struct ib_mad_agent *mad_agent;
+	u8 port_num;
+};
+
+struct cm_device {
+	struct list_head list;
+	struct ib_device *device;
+	u64 ca_guid;
+	struct cm_port port[0];
+};
+
+struct cm_av {
+	struct cm_port *port;
+	union ib_gid dgid;
+	struct ib_ah_attr ah_attr;
+	u16 pkey_index;
+	u8 packet_life_time;
+};
+
+struct cm_work {
+	struct work_struct work;
+	struct list_head list;
+	struct cm_port *port;
+	struct ib_mad_recv_wc *mad_recv_wc;	/* Received MADs */
+	u32 local_id;				/* Established / timewait */
+	u32 remote_id;
+	struct ib_cm_event cm_event;
+	struct ib_sa_path_rec path[0];
+};
+
+struct cm_timewait_info {
+	struct cm_work work;			/* Must be first. */
+	struct rb_node remote_qp_node;
+	struct rb_node remote_id_node;
+	u64 remote_ca_guid;
+	u32 remote_qpn;
+	u8 inserted_remote_qp;
+	u8 inserted_remote_id;
+};
+
+struct cm_id_private {
+	struct ib_cm_id	id;
+
+	struct rb_node service_node;
+	struct rb_node sidr_id_node;
+	spinlock_t lock;
+	wait_queue_head_t wait;
+	atomic_t refcount;
+
+	struct ib_mad_send_buf *msg;
+	struct cm_timewait_info *timewait_info;
+	/* todo: use alternate port on send failure */
+	struct cm_av av;
+	struct cm_av alt_av;
+
+	void *private_data;
+	u64 tid;
+	u32 local_qpn;
+	u32 remote_qpn;
+	u32 sq_psn;
+	u32 rq_psn;
+	int timeout_ms;
+	enum ib_mtu path_mtu;
+	u8 private_data_len;
+	u8 max_cm_retries;
+	u8 peer_to_peer;
+	u8 responder_resources;
+	u8 initiator_depth;
+	u8 local_ack_timeout;
+	u8 retry_count;
+	u8 rnr_retry_count;
+	u8 service_timeout;
+
+	struct list_head work_list;
+	atomic_t work_count;
+};
+
+static void cm_work_handler(void *data);
+
+static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
+{
+	if (atomic_dec_and_test(&cm_id_priv->refcount))
+		wake_up(&cm_id_priv->wait);
+}
+
+static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
+			struct ib_mad_send_buf **msg)
+{
+	struct ib_mad_agent *mad_agent;
+	struct ib_mad_send_buf *m;
+	struct ib_ah *ah;
+
+	mad_agent = cm_id_priv->av.port->mad_agent;
+	ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
+	if (IS_ERR(ah))
+		return PTR_ERR(ah);
+
+	m = ib_create_send_mad(mad_agent, 1, cm_id_priv->av.pkey_index,
+			       ah, 0, sizeof(struct ib_mad_hdr),
+			       sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr),
+			       GFP_ATOMIC);
+	if (IS_ERR(m)) {
+		ib_destroy_ah(ah);
+		return PTR_ERR(m);
+	}
+
+	/* Timeout set by caller if response is expected. */
+	m->send_wr.wr.ud.retries = cm_id_priv->max_cm_retries;
+
+	atomic_inc(&cm_id_priv->refcount);
+	m->context[0] = cm_id_priv;
+	*msg = m;
+	return 0;
+}
+
+static int cm_alloc_response_msg(struct cm_port *port,
+				 struct ib_mad_recv_wc *mad_recv_wc,
+				 struct ib_mad_send_buf **msg)
+{
+	struct ib_mad_send_buf *m;
+	struct ib_ah *ah;
+
+	ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
+				  mad_recv_wc->recv_buf.grh, port->port_num);
+	if (IS_ERR(ah))
+		return PTR_ERR(ah);
+
+	m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
+			       ah, 0, sizeof(struct ib_mad_hdr),
+			       sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr),
+			       GFP_ATOMIC);
+	if (IS_ERR(m)) {
+		ib_destroy_ah(ah);
+		return PTR_ERR(m);
+	}
+	*msg = m;
+	return 0;
+}
+
+static void cm_free_msg(struct ib_mad_send_buf *msg)
+{
+	ib_destroy_ah(msg->send_wr.wr.ud.ah);
+	if (msg->context[0])
+		cm_deref_id(msg->context[0]);
+	ib_free_send_mad(msg);
+}
+
+static void * cm_copy_private_data(const void *private_data,
+				   u8 private_data_len)
+{
+	void *data;
+
+	if (!private_data || !private_data_len)
+		return NULL;
+
+	data = kmalloc(private_data_len, GFP_KERNEL);
+	if (!data)
+		return ERR_PTR(-ENOMEM);
+
+	memcpy(data, private_data, private_data_len);
+	return data;
+}
+
+static void cm_set_private_data(struct cm_id_private *cm_id_priv,
+				 void *private_data, u8 private_data_len)
+{
+	if (cm_id_priv->private_data && cm_id_priv->private_data_len)
+		kfree(cm_id_priv->private_data);
+
+	cm_id_priv->private_data = private_data;
+	cm_id_priv->private_data_len = private_data_len;
+}
+
+static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num,
+			   u16 dlid, u8 sl, u16 src_path_bits)
+{
+	memset(ah_attr, 0, sizeof ah_attr);
+	ah_attr->dlid = be16_to_cpu(dlid);
+	ah_attr->sl = sl;
+	ah_attr->src_path_bits = src_path_bits;
+	ah_attr->port_num = port_num;
+}
+
+static void cm_init_av_for_response(struct cm_port *port,
+				    struct ib_wc *wc, struct cm_av *av)
+{
+	av->port = port;
+	av->pkey_index = wc->pkey_index;
+	cm_set_ah_attr(&av->ah_attr, port->port_num, cpu_to_be16(wc->slid),
+		       wc->sl, wc->dlid_path_bits);
+}
+
+static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
+{
+	struct cm_device *cm_dev;
+	struct cm_port *port = NULL;
+	unsigned long flags;
+	int ret;
+	u8 p;
+
+	read_lock_irqsave(&cm.device_lock, flags);
+	list_for_each_entry(cm_dev, &cm.device_list, list) {
+		if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
+					&p, NULL)) {
+			port = &cm_dev->port[p-1];
+			break;
+		}
+	}
+	read_unlock_irqrestore(&cm.device_lock, flags);
+
+	if (!port)
+		return -EINVAL;
+
+	ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
+				  be16_to_cpu(path->pkey), &av->pkey_index);
+	if (ret)
+		return ret;
+
+	av->port = port;
+	cm_set_ah_attr(&av->ah_attr, av->port->port_num, path->dlid,
+		       path->sl, path->slid & 0x7F);
+	av->packet_life_time = path->packet_life_time;
+	return 0;
+}
+
+static int cm_alloc_id(struct cm_id_private *cm_id_priv)
+{
+	unsigned long flags;
+	int ret;
+
+	do {
+		spin_lock_irqsave(&cm.lock, flags);
+		ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1,
+					(int *) &cm_id_priv->id.local_id);
+		spin_unlock_irqrestore(&cm.lock, flags);
+	} while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
+	return ret;
+}
+
+static void cm_free_id(u32 local_id)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cm.lock, flags);
+	idr_remove(&cm.local_id_table, (int) local_id);
+	spin_unlock_irqrestore(&cm.lock, flags);
+}
+
+static struct cm_id_private * cm_get_id(u32 local_id, u32 remote_id)
+{
+	struct cm_id_private *cm_id_priv;
+
+	cm_id_priv = idr_find(&cm.local_id_table, (int) local_id);
+	if (cm_id_priv) {
+		if (cm_id_priv->id.remote_id == remote_id)
+			atomic_inc(&cm_id_priv->refcount);
+		else
+			cm_id_priv = NULL;
+	}
+
+	return cm_id_priv;
+}
+
+static struct cm_id_private * cm_acquire_id(u32 local_id, u32 remote_id)
+{
+	struct cm_id_private *cm_id_priv;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cm.lock, flags);
+	cm_id_priv = cm_get_id(local_id, remote_id);
+	spin_unlock_irqrestore(&cm.lock, flags);
+
+	return cm_id_priv;
+}
+
+static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
+{
+	struct rb_node **link = &cm.listen_service_table.rb_node;
+	struct rb_node *parent = NULL;
+	struct cm_id_private *cur_cm_id_priv;
+	u64 service_id = cm_id_priv->id.service_id;
+	u64 service_mask = cm_id_priv->id.service_mask;
+
+	while (*link) {
+		parent = *link;
+		cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
+					  service_node);
+		if ((cur_cm_id_priv->id.service_mask & service_id) ==
+		    (service_mask & cur_cm_id_priv->id.service_id))
+			return cm_id_priv;
+		if (service_id < cur_cm_id_priv->id.service_id)
+			link = &(*link)->rb_left;
+		else
+			link = &(*link)->rb_right;
+	}
+	rb_link_node(&cm_id_priv->service_node, parent, link);
+	rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
+	return NULL;
+}
+
+static struct cm_id_private * cm_find_listen(u64 service_id)
+{
+	struct rb_node *node = cm.listen_service_table.rb_node;
+	struct cm_id_private *cm_id_priv;
+
+	while (node) {
+		cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
+		if ((cm_id_priv->id.service_mask & service_id) ==
+		    (cm_id_priv->id.service_mask & cm_id_priv->id.service_id))
+			return cm_id_priv;
+		if (service_id < cm_id_priv->id.service_id)
+			node = node->rb_left;
+		else
+			node = node->rb_right;
+	}
+	return NULL;
+}
+
+static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
+						     *timewait_info)
+{
+	struct rb_node **link = &cm.remote_id_table.rb_node;
+	struct rb_node *parent = NULL;
+	struct cm_timewait_info *cur_timewait_info;
+	u64 remote_ca_guid = timewait_info->remote_ca_guid;
+	u32 remote_id = timewait_info->work.remote_id;
+
+	while (*link) {
+		parent = *link;
+		cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
+					     remote_id_node);
+		if (remote_id < cur_timewait_info->work.remote_id)
+			link = &(*link)->rb_left;
+		else if (remote_id > cur_timewait_info->work.remote_id)
+			link = &(*link)->rb_right;
+		else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
+			link = &(*link)->rb_left;
+		else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
+			link = &(*link)->rb_right;
+		else
+			return cur_timewait_info;
+	}
+	timewait_info->inserted_remote_id = 1;
+	rb_link_node(&timewait_info->remote_id_node, parent, link);
+	rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
+	return NULL;
+}
+
+static struct cm_timewait_info * cm_find_remote_id(u64 remote_ca_guid,
+						   u32 remote_id)
+{
+	struct rb_node *node = cm.remote_id_table.rb_node;
+	struct cm_timewait_info *timewait_info;
+
+	while (node) {
+		timewait_info = rb_entry(node, struct cm_timewait_info,
+					 remote_id_node);
+		if (remote_id < timewait_info->work.remote_id)
+			node = node->rb_left;
+		else if (remote_id > timewait_info->work.remote_id)
+			node = node->rb_right;
+		else if (remote_ca_guid < timewait_info->remote_ca_guid)
+			node = node->rb_left;
+		else if (remote_ca_guid > timewait_info->remote_ca_guid)
+			node = node->rb_right;
+		else
+			return timewait_info;
+	}
+	return NULL;
+}
+
+static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
+						      *timewait_info)
+{
+	struct rb_node **link = &cm.remote_qp_table.rb_node;
+	struct rb_node *parent = NULL;
+	struct cm_timewait_info *cur_timewait_info;
+	u64 remote_ca_guid = timewait_info->remote_ca_guid;
+	u32 remote_qpn = timewait_info->remote_qpn;
+
+	while (*link) {
+		parent = *link;
+		cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
+					     remote_qp_node);
+		if (remote_qpn < cur_timewait_info->remote_qpn)
+			link = &(*link)->rb_left;
+		else if (remote_qpn > cur_timewait_info->remote_qpn)
+			link = &(*link)->rb_right;
+		else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
+			link = &(*link)->rb_left;
+		else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
+			link = &(*link)->rb_right;
+		else
+			return cur_timewait_info;
+	}
+	timewait_info->inserted_remote_qp = 1;
+	rb_link_node(&timewait_info->remote_qp_node, parent, link);
+	rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
+	return NULL;
+}
+
+static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
+						    *cm_id_priv)
+{
+	struct rb_node **link = &cm.remote_sidr_table.rb_node;
+	struct rb_node *parent = NULL;
+	struct cm_id_private *cur_cm_id_priv;
+	union ib_gid *port_gid = &cm_id_priv->av.dgid;
+	u32 remote_id = cm_id_priv->id.remote_id;
+
+	while (*link) {
+		parent = *link;
+		cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
+					  sidr_id_node);
+		if (remote_id < cur_cm_id_priv->id.remote_id)
+			link = &(*link)->rb_left;
+		else if (remote_id > cur_cm_id_priv->id.remote_id)
+			link = &(*link)->rb_right;
+		else {
+			int cmp;
+			cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
+				     sizeof *port_gid);
+			if (cmp < 0)
+				link = &(*link)->rb_left;
+			else if (cmp > 0)
+				link = &(*link)->rb_right;
+			else
+				return cur_cm_id_priv;
+		}
+	}
+	rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
+	rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
+	return NULL;
+}
+
+static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
+			       enum ib_cm_sidr_status status)
+{
+	struct ib_cm_sidr_rep_param param;
+
+	memset(&param, 0, sizeof param);
+	param.status = status;
+	ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
+}
+
+struct ib_cm_id *ib_create_cm_id(ib_cm_handler cm_handler,
+				 void *context)
+{
+	struct cm_id_private *cm_id_priv;
+	int ret;
+
+	cm_id_priv = kmalloc(sizeof *cm_id_priv, GFP_KERNEL);
+	if (!cm_id_priv)
+		return ERR_PTR(-ENOMEM);
+
+	memset(cm_id_priv, 0, sizeof *cm_id_priv);
+	cm_id_priv->id.state = IB_CM_IDLE;
+	cm_id_priv->id.cm_handler = cm_handler;
+	cm_id_priv->id.context = context;
+	ret = cm_alloc_id(cm_id_priv);
+	if (ret)
+		goto error;
+
+	spin_lock_init(&cm_id_priv->lock);
+	init_waitqueue_head(&cm_id_priv->wait);
+	INIT_LIST_HEAD(&cm_id_priv->work_list);
+	atomic_set(&cm_id_priv->work_count, -1);
+	atomic_set(&cm_id_priv->refcount, 1);
+	return &cm_id_priv->id;
+
+error:
+	kfree(cm_id_priv);
+	return ERR_PTR(-ENOMEM);
+}
+EXPORT_SYMBOL(ib_create_cm_id);
+
+static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
+{
+	struct cm_work *work;
+
+	if (list_empty(&cm_id_priv->work_list))
+		return NULL;
+
+	work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
+	list_del(&work->list);
+	return work;
+}
+
+static void cm_free_work(struct cm_work *work)
+{
+	if (work->mad_recv_wc)
+		ib_free_recv_mad(work->mad_recv_wc);
+	kfree(work);
+}
+
+static inline int cm_convert_to_ms(int iba_time)
+{
+	/* approximate conversion to ms from 4.096us x 2^iba_time */
+	return 1 << max(iba_time - 8, 0);
+}
+
+static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
+{
+	unsigned long flags;
+
+	if (!timewait_info->inserted_remote_id &&
+	    !timewait_info->inserted_remote_qp)
+	    return;
+
+	spin_lock_irqsave(&cm.lock, flags);
+	if (timewait_info->inserted_remote_id) {
+		rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
+		timewait_info->inserted_remote_id = 0;
+	}
+
+	if (timewait_info->inserted_remote_qp) {
+		rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
+		timewait_info->inserted_remote_qp = 0;
+	}
+	spin_unlock_irqrestore(&cm.lock, flags);
+}
+
+static struct cm_timewait_info * cm_create_timewait_info(u32 local_id)
+{
+	struct cm_timewait_info *timewait_info;
+
+	timewait_info = kmalloc(sizeof *timewait_info, GFP_KERNEL);
+	if (!timewait_info)
+		return ERR_PTR(-ENOMEM);
+	memset(timewait_info, 0, sizeof *timewait_info);
+
+	timewait_info->work.local_id = local_id;
+	INIT_WORK(&timewait_info->work.work, cm_work_handler,
+		  &timewait_info->work);
+	timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
+	return timewait_info;
+}
+
+static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
+{
+	int wait_time;
+
+	/*
+	 * The cm_id could be destroyed by the user before we exit timewait.
+	 * To protect against this, we search for the cm_id after exiting
+	 * timewait before notifying the user that we've exited timewait.
+	 */
+	cm_id_priv->id.state = IB_CM_TIMEWAIT;
+	wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
+	queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
+			   msecs_to_jiffies(wait_time));
+	cm_id_priv->timewait_info = NULL;
+}
+
+static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
+{
+	cm_id_priv->id.state = IB_CM_IDLE;
+	if (cm_id_priv->timewait_info) {
+		cm_cleanup_timewait(cm_id_priv->timewait_info);
+		kfree(cm_id_priv->timewait_info);
+		cm_id_priv->timewait_info = NULL;
+	}
+}
+
+void ib_destroy_cm_id(struct ib_cm_id *cm_id)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_work *work;
+	unsigned long flags;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+retest:
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id->state) {
+	case IB_CM_LISTEN:
+		cm_id->state = IB_CM_IDLE;
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		spin_lock_irqsave(&cm.lock, flags);
+		rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
+		spin_unlock_irqrestore(&cm.lock, flags);
+		break;
+	case IB_CM_SIDR_REQ_SENT:
+		cm_id->state = IB_CM_IDLE;
+		ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+			      (unsigned long) cm_id_priv->msg);
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		break;
+	case IB_CM_SIDR_REQ_RCVD:
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
+		break;
+	case IB_CM_REQ_SENT:
+	case IB_CM_MRA_REQ_RCVD:
+	case IB_CM_REP_SENT:
+	case IB_CM_MRA_REP_RCVD:
+		ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+			      (unsigned long) cm_id_priv->msg);
+		/* Fall through */
+	case IB_CM_REQ_RCVD:
+	case IB_CM_MRA_REQ_SENT:
+	case IB_CM_REP_RCVD:
+	case IB_CM_MRA_REP_SENT:
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
+			       &cm_id_priv->av.port->cm_dev->ca_guid,
+			       sizeof cm_id_priv->av.port->cm_dev->ca_guid,
+			       NULL, 0);
+		break;
+	case IB_CM_ESTABLISHED:
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		ib_send_cm_dreq(cm_id, NULL, 0);
+		goto retest;
+	case IB_CM_DREQ_SENT:
+		ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+			      (unsigned long) cm_id_priv->msg);
+		cm_enter_timewait(cm_id_priv);
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		break;
+	case IB_CM_DREQ_RCVD:
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		ib_send_cm_drep(cm_id, NULL, 0);
+		break;
+	default:
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		break;
+	}
+
+	cm_free_id(cm_id->local_id);
+	atomic_dec(&cm_id_priv->refcount);
+	wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount));
+	while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
+		cm_free_work(work);
+	if (cm_id_priv->private_data && cm_id_priv->private_data_len)
+		kfree(cm_id_priv->private_data);
+	kfree(cm_id_priv);
+}
+EXPORT_SYMBOL(ib_destroy_cm_id);
+
+int ib_cm_listen(struct ib_cm_id *cm_id,
+		 u64 service_id,
+		 u64 service_mask)
+{
+	struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
+	unsigned long flags;
+	int ret = 0;
+
+	service_mask = service_mask ? service_mask : ~0ULL;
+	service_id &= service_mask;
+	if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
+	    (service_id != IB_CM_ASSIGN_SERVICE_ID))
+		return -EINVAL;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	BUG_ON(cm_id->state != IB_CM_IDLE);
+
+	cm_id->state = IB_CM_LISTEN;
+
+	spin_lock_irqsave(&cm.lock, flags);
+	if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
+		cm_id->service_id = __cpu_to_be64(cm.listen_service_id++);
+		cm_id->service_mask = ~0ULL;
+	} else {
+		cm_id->service_id = service_id;
+		cm_id->service_mask = service_mask;
+	}
+	cur_cm_id_priv = cm_insert_listen(cm_id_priv);
+	spin_unlock_irqrestore(&cm.lock, flags);
+
+	if (cur_cm_id_priv) {
+		cm_id->state = IB_CM_IDLE;
+		ret = -EBUSY;
+	}
+	return ret;
+}
+EXPORT_SYMBOL(ib_cm_listen);
+
+static u64 cm_form_tid(struct cm_id_private *cm_id_priv,
+		       enum cm_msg_sequence msg_seq)
+{
+	u64 hi_tid, low_tid;
+
+	hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
+	low_tid  = (u64) (cm_id_priv->id.local_id | (msg_seq << 30));
+	return cpu_to_be64(hi_tid | low_tid);
+}
+
+static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
+			      enum cm_msg_attr_id attr_id, u64 tid)
+{
+	hdr->base_version  = IB_MGMT_BASE_VERSION;
+	hdr->mgmt_class	   = IB_MGMT_CLASS_CM;
+	hdr->class_version = IB_CM_CLASS_VERSION;
+	hdr->method	   = IB_MGMT_METHOD_SEND;
+	hdr->attr_id	   = attr_id;
+	hdr->tid	   = tid;
+}
+
+static void cm_format_req(struct cm_req_msg *req_msg,
+			  struct cm_id_private *cm_id_priv,
+			  struct ib_cm_req_param *param)
+{
+	cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
+			  cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
+
+	req_msg->local_comm_id = cm_id_priv->id.local_id;
+	req_msg->service_id = param->service_id;
+	req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
+	cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
+	cm_req_set_resp_res(req_msg, param->responder_resources);
+	cm_req_set_init_depth(req_msg, param->initiator_depth);
+	cm_req_set_remote_resp_timeout(req_msg,
+				       param->remote_cm_response_timeout);
+	cm_req_set_qp_type(req_msg, param->qp_type);
+	cm_req_set_flow_ctrl(req_msg, param->flow_control);
+	cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
+	cm_req_set_local_resp_timeout(req_msg,
+				      param->local_cm_response_timeout);
+	cm_req_set_retry_count(req_msg, param->retry_count);
+	req_msg->pkey = param->primary_path->pkey;
+	cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
+	cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
+	cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
+	cm_req_set_srq(req_msg, param->srq);
+
+	req_msg->primary_local_lid = param->primary_path->slid;
+	req_msg->primary_remote_lid = param->primary_path->dlid;
+	req_msg->primary_local_gid = param->primary_path->sgid;
+	req_msg->primary_remote_gid = param->primary_path->dgid;
+	cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
+	cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
+	req_msg->primary_traffic_class = param->primary_path->traffic_class;
+	req_msg->primary_hop_limit = param->primary_path->hop_limit;
+	cm_req_set_primary_sl(req_msg, param->primary_path->sl);
+	cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
+	cm_req_set_primary_local_ack_timeout(req_msg,
+		min(31, param->primary_path->packet_life_time + 1));
+
+	if (param->alternate_path) {
+		req_msg->alt_local_lid = param->alternate_path->slid;
+		req_msg->alt_remote_lid = param->alternate_path->dlid;
+		req_msg->alt_local_gid = param->alternate_path->sgid;
+		req_msg->alt_remote_gid = param->alternate_path->dgid;
+		cm_req_set_alt_flow_label(req_msg,
+					  param->alternate_path->flow_label);
+		cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
+		req_msg->alt_traffic_class = param->alternate_path->traffic_class;
+		req_msg->alt_hop_limit = param->alternate_path->hop_limit;
+		cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
+		cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
+		cm_req_set_alt_local_ack_timeout(req_msg,
+			min(31, param->alternate_path->packet_life_time + 1));
+	}
+
+	if (param->private_data && param->private_data_len)
+		memcpy(req_msg->private_data, param->private_data,
+		       param->private_data_len);
+}
+
+static inline int cm_validate_req_param(struct ib_cm_req_param *param)
+{
+	/* peer-to-peer not supported */
+	if (param->peer_to_peer)
+		return -EINVAL;
+
+	if (!param->primary_path)
+		return -EINVAL;
+
+	if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
+		return -EINVAL;
+
+	if (param->private_data &&
+	    param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
+		return -EINVAL;
+
+	if (param->alternate_path &&
+	    (param->alternate_path->pkey != param->primary_path->pkey ||
+	     param->alternate_path->mtu != param->primary_path->mtu))
+		return -EINVAL;
+
+	return 0;
+}
+
+int ib_send_cm_req(struct ib_cm_id *cm_id,
+		   struct ib_cm_req_param *param)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_send_wr *bad_send_wr;
+	struct cm_req_msg *req_msg;
+	unsigned long flags;
+	int ret;
+
+	ret = cm_validate_req_param(param);
+	if (ret)
+		return ret;
+
+	/* Verify that we're not in timewait. */
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id->state != IB_CM_IDLE) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		ret = -EINVAL;
+		goto out;
+	}
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
+							    id.local_id);
+	if (IS_ERR(cm_id_priv->timewait_info))
+		goto out;
+
+	ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
+	if (ret)
+		goto error1;
+	if (param->alternate_path) {
+		ret = cm_init_av_by_path(param->alternate_path,
+					 &cm_id_priv->alt_av);
+		if (ret)
+			goto error1;
+	}
+	cm_id->service_id = param->service_id;
+	cm_id->service_mask = ~0ULL;
+	cm_id_priv->timeout_ms = cm_convert_to_ms(
+				    param->primary_path->packet_life_time) * 2 +
+				 cm_convert_to_ms(
+				    param->remote_cm_response_timeout);
+	cm_id_priv->max_cm_retries = param->max_cm_retries;
+	cm_id_priv->initiator_depth = param->initiator_depth;
+	cm_id_priv->responder_resources = param->responder_resources;
+	cm_id_priv->retry_count = param->retry_count;
+	cm_id_priv->path_mtu = param->primary_path->mtu;
+
+	ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
+	if (ret)
+		goto error1;
+
+	req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
+	cm_format_req(req_msg, cm_id_priv, param);
+	cm_id_priv->tid = req_msg->hdr.tid;
+	cm_id_priv->msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
+	cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
+
+	cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
+	cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
+	cm_id_priv->local_ack_timeout =
+				cm_req_get_primary_local_ack_timeout(req_msg);
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+				&cm_id_priv->msg->send_wr, &bad_send_wr);
+	if (ret) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		goto error2;
+	}
+	BUG_ON(cm_id->state != IB_CM_IDLE);
+	cm_id->state = IB_CM_REQ_SENT;
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return 0;
+
+error2:	cm_free_msg(cm_id_priv->msg);
+error1:	kfree(cm_id_priv->timewait_info);
+out:	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_req);
+
+static int cm_issue_rej(struct cm_port *port,
+			struct ib_mad_recv_wc *mad_recv_wc,
+			enum ib_cm_rej_reason reason,
+			enum cm_msg_response msg_rejected,
+			void *ari, u8 ari_length)
+{
+	struct ib_mad_send_buf *msg = NULL;
+	struct ib_send_wr *bad_send_wr;
+	struct cm_rej_msg *rej_msg, *rcv_msg;
+	int ret;
+
+	ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
+	if (ret)
+		return ret;
+
+	/* We just need common CM header information.  Cast to any message. */
+	rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
+	rej_msg = (struct cm_rej_msg *) msg->mad;
+
+	cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
+	rej_msg->remote_comm_id = rcv_msg->local_comm_id;
+	rej_msg->local_comm_id = rcv_msg->remote_comm_id;
+	cm_rej_set_msg_rejected(rej_msg, msg_rejected);
+	rej_msg->reason = reason;
+
+	if (ari && ari_length) {
+		cm_rej_set_reject_info_len(rej_msg, ari_length);
+		memcpy(rej_msg->ari, ari, ari_length);
+	}
+
+	ret = ib_post_send_mad(port->mad_agent, &msg->send_wr, &bad_send_wr);
+	if (ret)
+		cm_free_msg(msg);
+
+	return ret;
+}
+
+static inline int cm_is_active_peer(u64 local_ca_guid, u64 remote_ca_guid,
+				    u32 local_qpn, u32 remote_qpn)
+{
+	return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
+		((local_ca_guid == remote_ca_guid) &&
+		 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
+}
+
+static inline void cm_format_paths_from_req(struct cm_req_msg *req_msg,
+					    struct ib_sa_path_rec *primary_path,
+					    struct ib_sa_path_rec *alt_path)
+{
+	memset(primary_path, 0, sizeof *primary_path);
+	primary_path->dgid = req_msg->primary_local_gid;
+	primary_path->sgid = req_msg->primary_remote_gid;
+	primary_path->dlid = req_msg->primary_local_lid;
+	primary_path->slid = req_msg->primary_remote_lid;
+	primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
+	primary_path->hop_limit = req_msg->primary_hop_limit;
+	primary_path->traffic_class = req_msg->primary_traffic_class;
+	primary_path->reversible = 1;
+	primary_path->pkey = req_msg->pkey;
+	primary_path->sl = cm_req_get_primary_sl(req_msg);
+	primary_path->mtu_selector = IB_SA_EQ;
+	primary_path->mtu = cm_req_get_path_mtu(req_msg);
+	primary_path->rate_selector = IB_SA_EQ;
+	primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
+	primary_path->packet_life_time_selector = IB_SA_EQ;
+	primary_path->packet_life_time =
+		cm_req_get_primary_local_ack_timeout(req_msg);
+	primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
+
+	if (req_msg->alt_local_lid) {
+		memset(alt_path, 0, sizeof *alt_path);
+		alt_path->dgid = req_msg->alt_local_gid;
+		alt_path->sgid = req_msg->alt_remote_gid;
+		alt_path->dlid = req_msg->alt_local_lid;
+		alt_path->slid = req_msg->alt_remote_lid;
+		alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
+		alt_path->hop_limit = req_msg->alt_hop_limit;
+		alt_path->traffic_class = req_msg->alt_traffic_class;
+		alt_path->reversible = 1;
+		alt_path->pkey = req_msg->pkey;
+		alt_path->sl = cm_req_get_alt_sl(req_msg);
+		alt_path->mtu_selector = IB_SA_EQ;
+		alt_path->mtu = cm_req_get_path_mtu(req_msg);
+		alt_path->rate_selector = IB_SA_EQ;
+		alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
+		alt_path->packet_life_time_selector = IB_SA_EQ;
+		alt_path->packet_life_time =
+			cm_req_get_alt_local_ack_timeout(req_msg);
+		alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
+	}
+}
+
+static void cm_format_req_event(struct cm_work *work,
+				struct cm_id_private *cm_id_priv,
+				struct ib_cm_id *listen_id)
+{
+	struct cm_req_msg *req_msg;
+	struct ib_cm_req_event_param *param;
+
+	req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
+	param = &work->cm_event.param.req_rcvd;
+	param->listen_id = listen_id;
+	param->device = cm_id_priv->av.port->mad_agent->device;
+	param->port = cm_id_priv->av.port->port_num;
+	param->primary_path = &work->path[0];
+	if (req_msg->alt_local_lid)
+		param->alternate_path = &work->path[1];
+	else
+		param->alternate_path = NULL;
+	param->remote_ca_guid = req_msg->local_ca_guid;
+	param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
+	param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
+	param->qp_type = cm_req_get_qp_type(req_msg);
+	param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
+	param->responder_resources = cm_req_get_init_depth(req_msg);
+	param->initiator_depth = cm_req_get_resp_res(req_msg);
+	param->local_cm_response_timeout =
+					cm_req_get_remote_resp_timeout(req_msg);
+	param->flow_control = cm_req_get_flow_ctrl(req_msg);
+	param->remote_cm_response_timeout =
+					cm_req_get_local_resp_timeout(req_msg);
+	param->retry_count = cm_req_get_retry_count(req_msg);
+	param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
+	param->srq = cm_req_get_srq(req_msg);
+	work->cm_event.private_data = &req_msg->private_data;
+}
+
+static void cm_process_work(struct cm_id_private *cm_id_priv,
+			    struct cm_work *work)
+{
+	unsigned long flags;
+	int ret;
+
+	/* We will typically only have the current event to report. */
+	ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
+	cm_free_work(work);
+
+	while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
+		spin_lock_irqsave(&cm_id_priv->lock, flags);
+		work = cm_dequeue_work(cm_id_priv);
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		BUG_ON(!work);
+		ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
+						&work->cm_event);
+		cm_free_work(work);
+	}
+	cm_deref_id(cm_id_priv);
+	if (ret)
+		ib_destroy_cm_id(&cm_id_priv->id);
+}
+
+static void cm_format_mra(struct cm_mra_msg *mra_msg,
+			  struct cm_id_private *cm_id_priv,
+			  enum cm_msg_response msg_mraed, u8 service_timeout,
+			  const void *private_data, u8 private_data_len)
+{
+	cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
+	cm_mra_set_msg_mraed(mra_msg, msg_mraed);
+	mra_msg->local_comm_id = cm_id_priv->id.local_id;
+	mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
+	cm_mra_set_service_timeout(mra_msg, service_timeout);
+
+	if (private_data && private_data_len)
+		memcpy(mra_msg->private_data, private_data, private_data_len);
+}
+
+static void cm_format_rej(struct cm_rej_msg *rej_msg,
+			  struct cm_id_private *cm_id_priv,
+			  enum ib_cm_rej_reason reason,
+			  void *ari,
+			  u8 ari_length,
+			  const void *private_data,
+			  u8 private_data_len)
+{
+	cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
+	rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
+
+	switch(cm_id_priv->id.state) {
+	case IB_CM_REQ_RCVD:
+		rej_msg->local_comm_id = 0;
+		cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
+		break;
+	case IB_CM_MRA_REQ_SENT:
+		rej_msg->local_comm_id = cm_id_priv->id.local_id;
+		cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
+		break;
+	case IB_CM_REP_RCVD:
+	case IB_CM_MRA_REP_SENT:
+		rej_msg->local_comm_id = cm_id_priv->id.local_id;
+		cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
+		break;
+	default:
+		rej_msg->local_comm_id = cm_id_priv->id.local_id;
+		cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
+		break;
+	}
+
+	rej_msg->reason = reason;
+	if (ari && ari_length) {
+		cm_rej_set_reject_info_len(rej_msg, ari_length);
+		memcpy(rej_msg->ari, ari, ari_length);
+	}
+
+	if (private_data && private_data_len)
+		memcpy(rej_msg->private_data, private_data, private_data_len);
+}
+
+static void cm_dup_req_handler(struct cm_work *work,
+			       struct cm_id_private *cm_id_priv)
+{
+	struct ib_mad_send_buf *msg = NULL;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	/* Quick state check to discard duplicate REQs. */
+	if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
+		return;
+
+	ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
+	if (ret)
+		return;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id_priv->id.state) {
+	case IB_CM_MRA_REQ_SENT:
+		cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
+			      CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
+			      cm_id_priv->private_data,
+			      cm_id_priv->private_data_len);
+		break;
+	case IB_CM_TIMEWAIT:
+		cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
+			      IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
+		break;
+	default:
+		goto unlock;
+	}
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
+			       &bad_send_wr);
+	if (ret)
+		goto free;
+	return;
+
+unlock:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+free:	cm_free_msg(msg);
+}
+
+static struct cm_id_private * cm_match_req(struct cm_work *work,
+					   struct cm_id_private *cm_id_priv)
+{
+	struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
+	struct cm_timewait_info *timewait_info;
+	struct cm_req_msg *req_msg;
+	unsigned long flags;
+
+	req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
+
+	/* Check for duplicate REQ and stale connections. */
+	spin_lock_irqsave(&cm.lock, flags);
+	timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
+	if (!timewait_info)
+		timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
+
+	if (timewait_info) {
+		cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
+					   timewait_info->work.remote_id);
+		spin_unlock_irqrestore(&cm.lock, flags);
+		if (cur_cm_id_priv) {
+			cm_dup_req_handler(work, cur_cm_id_priv);
+			cm_deref_id(cur_cm_id_priv);
+		} else
+			cm_issue_rej(work->port, work->mad_recv_wc,
+				     IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
+				     NULL, 0);
+		goto error;
+	}
+
+	/* Find matching listen request. */
+	listen_cm_id_priv = cm_find_listen(req_msg->service_id);
+	if (!listen_cm_id_priv) {
+		spin_unlock_irqrestore(&cm.lock, flags);
+		cm_issue_rej(work->port, work->mad_recv_wc,
+			     IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
+			     NULL, 0);
+		goto error;
+	}
+	atomic_inc(&listen_cm_id_priv->refcount);
+	atomic_inc(&cm_id_priv->refcount);
+	cm_id_priv->id.state = IB_CM_REQ_RCVD;
+	atomic_inc(&cm_id_priv->work_count);
+	spin_unlock_irqrestore(&cm.lock, flags);
+	return listen_cm_id_priv;
+
+error:	cm_cleanup_timewait(cm_id_priv->timewait_info);
+	return NULL;
+}
+
+static int cm_req_handler(struct cm_work *work)
+{
+	struct ib_cm_id *cm_id;
+	struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
+	struct cm_req_msg *req_msg;
+	int ret;
+
+	req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
+
+	cm_id = ib_create_cm_id(NULL, NULL);
+	if (IS_ERR(cm_id))
+		return PTR_ERR(cm_id);
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	cm_id_priv->id.remote_id = req_msg->local_comm_id;
+	cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
+				&cm_id_priv->av);
+	cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
+							    id.local_id);
+	if (IS_ERR(cm_id_priv->timewait_info)) {
+		ret = PTR_ERR(cm_id_priv->timewait_info);
+		goto error1;
+	}
+	cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
+	cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
+	cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
+
+	listen_cm_id_priv = cm_match_req(work, cm_id_priv);
+	if (!listen_cm_id_priv) {
+		ret = -EINVAL;
+		goto error2;
+	}
+
+	cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
+	cm_id_priv->id.context = listen_cm_id_priv->id.context;
+	cm_id_priv->id.service_id = req_msg->service_id;
+	cm_id_priv->id.service_mask = ~0ULL;
+
+	cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
+	ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
+	if (ret)
+		goto error3;
+	if (req_msg->alt_local_lid) {
+		ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
+		if (ret)
+			goto error3;
+	}
+	cm_id_priv->tid = req_msg->hdr.tid;
+	cm_id_priv->timeout_ms = cm_convert_to_ms(
+					cm_req_get_local_resp_timeout(req_msg));
+	cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
+	cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
+	cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
+	cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
+	cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
+	cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
+	cm_id_priv->local_ack_timeout =
+				cm_req_get_primary_local_ack_timeout(req_msg);
+	cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
+	cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
+
+	cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
+	cm_process_work(cm_id_priv, work);
+	cm_deref_id(listen_cm_id_priv);
+	return 0;
+
+error3:	atomic_dec(&cm_id_priv->refcount);
+	cm_deref_id(listen_cm_id_priv);
+	cm_cleanup_timewait(cm_id_priv->timewait_info);
+error2:	kfree(cm_id_priv->timewait_info);
+error1:	ib_destroy_cm_id(&cm_id_priv->id);
+	return ret;
+}
+
+static void cm_format_rep(struct cm_rep_msg *rep_msg,
+			  struct cm_id_private *cm_id_priv,
+			  struct ib_cm_rep_param *param)
+{
+	cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
+	rep_msg->local_comm_id = cm_id_priv->id.local_id;
+	rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
+	cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
+	cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
+	rep_msg->resp_resources = param->responder_resources;
+	rep_msg->initiator_depth = param->initiator_depth;
+	cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
+	cm_rep_set_failover(rep_msg, param->failover_accepted);
+	cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
+	cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
+	cm_rep_set_srq(rep_msg, param->srq);
+	rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
+
+	if (param->private_data && param->private_data_len)
+		memcpy(rep_msg->private_data, param->private_data,
+		       param->private_data_len);
+}
+
+int ib_send_cm_rep(struct ib_cm_id *cm_id,
+		   struct ib_cm_rep_param *param)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct cm_rep_msg *rep_msg;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	if (param->private_data &&
+	    param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
+		return -EINVAL;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id->state != IB_CM_REQ_RCVD &&
+	    cm_id->state != IB_CM_MRA_REQ_SENT) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = cm_alloc_msg(cm_id_priv, &msg);
+	if (ret)
+		goto out;
+
+	rep_msg = (struct cm_rep_msg *) msg->mad;
+	cm_format_rep(rep_msg, cm_id_priv, param);
+	msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
+	msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
+
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+			       &msg->send_wr, &bad_send_wr);
+	if (ret) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		cm_free_msg(msg);
+		return ret;
+	}
+
+	cm_id->state = IB_CM_REP_SENT;
+	cm_id_priv->msg = msg;
+	cm_id_priv->initiator_depth = param->initiator_depth;
+	cm_id_priv->responder_resources = param->responder_resources;
+	cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
+	cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
+
+out:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_rep);
+
+static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
+			  struct cm_id_private *cm_id_priv,
+			  const void *private_data,
+			  u8 private_data_len)
+{
+	cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
+	rtu_msg->local_comm_id = cm_id_priv->id.local_id;
+	rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
+
+	if (private_data && private_data_len)
+		memcpy(rtu_msg->private_data, private_data, private_data_len);
+}
+
+int ib_send_cm_rtu(struct ib_cm_id *cm_id,
+		   const void *private_data,
+		   u8 private_data_len)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	void *data;
+	int ret;
+
+	if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
+		return -EINVAL;
+
+	data = cm_copy_private_data(private_data, private_data_len);
+	if (IS_ERR(data))
+		return PTR_ERR(data);
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id->state != IB_CM_REP_RCVD &&
+	    cm_id->state != IB_CM_MRA_REP_SENT) {
+		ret = -EINVAL;
+		goto error;
+	}
+
+	ret = cm_alloc_msg(cm_id_priv, &msg);
+	if (ret)
+		goto error;
+
+	cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
+		      private_data, private_data_len);
+
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+			       &msg->send_wr, &bad_send_wr);
+	if (ret) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		cm_free_msg(msg);
+		kfree(data);
+		return ret;
+	}
+
+	cm_id->state = IB_CM_ESTABLISHED;
+	cm_set_private_data(cm_id_priv, data, private_data_len);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return 0;
+
+error:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	kfree(data);
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_rtu);
+
+static void cm_format_rep_event(struct cm_work *work)
+{
+	struct cm_rep_msg *rep_msg;
+	struct ib_cm_rep_event_param *param;
+
+	rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
+	param = &work->cm_event.param.rep_rcvd;
+	param->remote_ca_guid = rep_msg->local_ca_guid;
+	param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
+	param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
+	param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
+	param->responder_resources = rep_msg->initiator_depth;
+	param->initiator_depth = rep_msg->resp_resources;
+	param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
+	param->failover_accepted = cm_rep_get_failover(rep_msg);
+	param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
+	param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
+	param->srq = cm_rep_get_srq(rep_msg);
+	work->cm_event.private_data = &rep_msg->private_data;
+}
+
+static void cm_dup_rep_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_rep_msg *rep_msg;
+	struct ib_mad_send_buf *msg = NULL;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
+				   rep_msg->local_comm_id);
+	if (!cm_id_priv)
+		return;
+
+	ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
+	if (ret)
+		goto deref;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
+		cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
+			      cm_id_priv->private_data,
+			      cm_id_priv->private_data_len);
+	else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
+		cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
+			      CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
+			      cm_id_priv->private_data,
+			      cm_id_priv->private_data_len);
+	else
+		goto unlock;
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
+			       &bad_send_wr);
+	if (ret)
+		goto free;
+	goto deref;
+
+unlock:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+free:	cm_free_msg(msg);
+deref:	cm_deref_id(cm_id_priv);
+}
+
+static int cm_rep_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_rep_msg *rep_msg;
+	unsigned long flags;
+	int ret;
+
+	rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
+	if (!cm_id_priv) {
+		cm_dup_rep_handler(work);
+		return -EINVAL;
+	}
+
+	cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
+	cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
+	cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
+
+	spin_lock_irqsave(&cm.lock, flags);
+	/* Check for duplicate REP. */
+	if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
+		spin_unlock_irqrestore(&cm.lock, flags);
+		ret = -EINVAL;
+		goto error;
+	}
+	/* Check for a stale connection. */
+	if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
+		spin_unlock_irqrestore(&cm.lock, flags);
+		cm_issue_rej(work->port, work->mad_recv_wc,
+			     IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
+			     NULL, 0);
+		ret = -EINVAL;
+		goto error;
+	}
+	spin_unlock_irqrestore(&cm.lock, flags);
+
+	cm_format_rep_event(work);
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id_priv->id.state) {
+	case IB_CM_REQ_SENT:
+	case IB_CM_MRA_REQ_RCVD:
+		break;
+	default:
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		ret = -EINVAL;
+		goto error;
+	}
+	cm_id_priv->id.state = IB_CM_REP_RCVD;
+	cm_id_priv->id.remote_id = rep_msg->local_comm_id;
+	cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
+	cm_id_priv->initiator_depth = rep_msg->resp_resources;
+	cm_id_priv->responder_resources = rep_msg->initiator_depth;
+	cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
+	cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
+
+	/* todo: handle peer_to_peer */
+
+	ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+		      (unsigned long) cm_id_priv->msg);
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+
+error:	cm_cleanup_timewait(cm_id_priv->timewait_info);
+	cm_deref_id(cm_id_priv);
+	return ret;
+}
+
+static int cm_establish_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	unsigned long flags;
+	int ret;
+
+	/* See comment in ib_cm_establish about lookup. */
+	cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
+	if (!cm_id_priv)
+		return -EINVAL;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		goto out;
+	}
+
+	ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+		      (unsigned long) cm_id_priv->msg);
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+out:
+	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+static int cm_rtu_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_rtu_msg *rtu_msg;
+	unsigned long flags;
+	int ret;
+
+	rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
+				   rtu_msg->local_comm_id);
+	if (!cm_id_priv)
+		return -EINVAL;
+
+	work->cm_event.private_data = &rtu_msg->private_data;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id_priv->id.state != IB_CM_REP_SENT &&
+	    cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		goto out;
+	}
+	cm_id_priv->id.state = IB_CM_ESTABLISHED;
+
+	ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+		      (unsigned long) cm_id_priv->msg);
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+out:
+	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
+			  struct cm_id_private *cm_id_priv,
+			  const void *private_data,
+			  u8 private_data_len)
+{
+	cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
+			  cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
+	dreq_msg->local_comm_id = cm_id_priv->id.local_id;
+	dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
+	cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
+
+	if (private_data && private_data_len)
+		memcpy(dreq_msg->private_data, private_data, private_data_len);
+}
+
+int ib_send_cm_dreq(struct ib_cm_id *cm_id,
+		    const void *private_data,
+		    u8 private_data_len)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
+		return -EINVAL;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id->state != IB_CM_ESTABLISHED) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = cm_alloc_msg(cm_id_priv, &msg);
+	if (ret) {
+		cm_enter_timewait(cm_id_priv);
+		goto out;
+	}
+
+	cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
+		       private_data, private_data_len);
+	msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
+	msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
+
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+			       &msg->send_wr, &bad_send_wr);
+	if (ret) {
+		cm_enter_timewait(cm_id_priv);
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		cm_free_msg(msg);
+		return ret;
+	}
+
+	cm_id->state = IB_CM_DREQ_SENT;
+	cm_id_priv->msg = msg;
+out:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_dreq);
+
+static void cm_format_drep(struct cm_drep_msg *drep_msg,
+			  struct cm_id_private *cm_id_priv,
+			  const void *private_data,
+			  u8 private_data_len)
+{
+	cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
+	drep_msg->local_comm_id = cm_id_priv->id.local_id;
+	drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
+
+	if (private_data && private_data_len)
+		memcpy(drep_msg->private_data, private_data, private_data_len);
+}
+
+int ib_send_cm_drep(struct ib_cm_id *cm_id,
+		    const void *private_data,
+		    u8 private_data_len)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	void *data;
+	int ret;
+
+	if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
+		return -EINVAL;
+
+	data = cm_copy_private_data(private_data, private_data_len);
+	if (IS_ERR(data))
+		return PTR_ERR(data);
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id->state != IB_CM_DREQ_RCVD) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		kfree(data);
+		return -EINVAL;
+	}
+
+	cm_set_private_data(cm_id_priv, data, private_data_len);
+	cm_enter_timewait(cm_id_priv);
+
+	ret = cm_alloc_msg(cm_id_priv, &msg);
+	if (ret)
+		goto out;
+
+	cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
+		       private_data, private_data_len);
+
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
+			       &bad_send_wr);
+	if (ret) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		cm_free_msg(msg);
+		return ret;
+	}
+
+out:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_drep);
+
+static int cm_dreq_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_dreq_msg *dreq_msg;
+	struct ib_mad_send_buf *msg = NULL;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
+				   dreq_msg->local_comm_id);
+	if (!cm_id_priv)
+		return -EINVAL;
+
+	work->cm_event.private_data = &dreq_msg->private_data;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
+		goto unlock;
+
+	switch (cm_id_priv->id.state) {
+	case IB_CM_REP_SENT:
+	case IB_CM_DREQ_SENT:
+		ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+			      (unsigned long) cm_id_priv->msg);
+		break;
+	case IB_CM_ESTABLISHED:
+	case IB_CM_MRA_REP_RCVD:
+		break;
+	case IB_CM_TIMEWAIT:
+		if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
+			goto unlock;
+
+		cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
+			       cm_id_priv->private_data,
+			       cm_id_priv->private_data_len);
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+		if (ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+				     &msg->send_wr, &bad_send_wr))
+			cm_free_msg(msg);
+		goto deref;
+	default:
+		goto unlock;
+	}
+	cm_id_priv->id.state = IB_CM_DREQ_RCVD;
+	cm_id_priv->tid = dreq_msg->hdr.tid;
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+
+unlock:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+deref:	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+static int cm_drep_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_drep_msg *drep_msg;
+	unsigned long flags;
+	int ret;
+
+	drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
+				   drep_msg->local_comm_id);
+	if (!cm_id_priv)
+		return -EINVAL;
+
+	work->cm_event.private_data = &drep_msg->private_data;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
+	    cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		goto out;
+	}
+	cm_enter_timewait(cm_id_priv);
+
+	ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+		      (unsigned long) cm_id_priv->msg);
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+out:
+	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+int ib_send_cm_rej(struct ib_cm_id *cm_id,
+		   enum ib_cm_rej_reason reason,
+		   void *ari,
+		   u8 ari_length,
+		   const void *private_data,
+		   u8 private_data_len)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
+	    (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
+		return -EINVAL;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id->state) {
+	case IB_CM_REQ_SENT:
+	case IB_CM_MRA_REQ_RCVD:
+	case IB_CM_REQ_RCVD:
+	case IB_CM_MRA_REQ_SENT:
+	case IB_CM_REP_RCVD:
+	case IB_CM_MRA_REP_SENT:
+		ret = cm_alloc_msg(cm_id_priv, &msg);
+		if (!ret)
+			cm_format_rej((struct cm_rej_msg *) msg->mad,
+				      cm_id_priv, reason, ari, ari_length,
+				      private_data, private_data_len);
+
+		cm_reset_to_idle(cm_id_priv);
+		break;
+	case IB_CM_REP_SENT:
+	case IB_CM_MRA_REP_RCVD:
+		ret = cm_alloc_msg(cm_id_priv, &msg);
+		if (!ret)
+			cm_format_rej((struct cm_rej_msg *) msg->mad,
+				      cm_id_priv, reason, ari, ari_length,
+				      private_data, private_data_len);
+
+		cm_enter_timewait(cm_id_priv);
+		break;
+	default:
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (ret)
+		goto out;
+
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+			       &msg->send_wr, &bad_send_wr);
+	if (ret)
+		cm_free_msg(msg);
+
+out:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_rej);
+
+static void cm_format_rej_event(struct cm_work *work)
+{
+	struct cm_rej_msg *rej_msg;
+	struct ib_cm_rej_event_param *param;
+
+	rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
+	param = &work->cm_event.param.rej_rcvd;
+	param->ari = rej_msg->ari;
+	param->ari_length = cm_rej_get_reject_info_len(rej_msg);
+	param->reason = rej_msg->reason;
+	work->cm_event.private_data = &rej_msg->private_data;
+}
+
+static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
+{
+	struct cm_timewait_info *timewait_info;
+	struct cm_id_private *cm_id_priv;
+	unsigned long flags;
+	u32 remote_id;
+
+	remote_id = rej_msg->local_comm_id;
+
+	if (rej_msg->reason == IB_CM_REJ_TIMEOUT) {
+		spin_lock_irqsave(&cm.lock, flags);
+		timewait_info = cm_find_remote_id( *((u64 *) rej_msg->ari),
+						  remote_id);
+		if (!timewait_info) {
+			spin_unlock_irqrestore(&cm.lock, flags);
+			return NULL;
+		}
+		cm_id_priv = idr_find(&cm.local_id_table,
+				      (int) timewait_info->work.local_id);
+		if (cm_id_priv) {
+			if (cm_id_priv->id.remote_id == remote_id)
+				atomic_inc(&cm_id_priv->refcount);
+			else
+				cm_id_priv = NULL;
+		}
+		spin_unlock_irqrestore(&cm.lock, flags);
+	} else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
+		cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
+	else
+		cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
+
+	return cm_id_priv;
+}
+
+static int cm_rej_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_rej_msg *rej_msg;
+	unsigned long flags;
+	int ret;
+
+	rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_rejected_id(rej_msg);
+	if (!cm_id_priv)
+		return -EINVAL;
+
+	cm_format_rej_event(work);
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id_priv->id.state) {
+	case IB_CM_REQ_SENT:
+	case IB_CM_MRA_REQ_RCVD:
+	case IB_CM_REP_SENT:
+	case IB_CM_MRA_REP_RCVD:
+		ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+			      (unsigned long) cm_id_priv->msg);
+		/* fall through */
+	case IB_CM_REQ_RCVD:
+	case IB_CM_MRA_REQ_SENT:
+		if (rej_msg->reason == IB_CM_REJ_STALE_CONN)
+			cm_enter_timewait(cm_id_priv);
+		else
+			cm_reset_to_idle(cm_id_priv);
+		break;
+	case IB_CM_DREQ_SENT:
+		ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+			      (unsigned long) cm_id_priv->msg);
+		/* fall through */
+	case IB_CM_REP_RCVD:
+	case IB_CM_MRA_REP_SENT:
+	case IB_CM_ESTABLISHED:
+		cm_enter_timewait(cm_id_priv);
+		break;
+	default:
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+out:
+	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+int ib_send_cm_mra(struct ib_cm_id *cm_id,
+		   u8 service_timeout,
+		   const void *private_data,
+		   u8 private_data_len)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct ib_send_wr *bad_send_wr;
+	void *data;
+	unsigned long flags;
+	int ret;
+
+	if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
+		return -EINVAL;
+
+	data = cm_copy_private_data(private_data, private_data_len);
+	if (IS_ERR(data))
+		return PTR_ERR(data);
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch(cm_id_priv->id.state) {
+	case IB_CM_REQ_RCVD:
+		ret = cm_alloc_msg(cm_id_priv, &msg);
+		if (ret)
+			goto error1;
+
+		cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
+			      CM_MSG_RESPONSE_REQ, service_timeout,
+			      private_data, private_data_len);
+		ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+				       &msg->send_wr, &bad_send_wr);
+		if (ret)
+			goto error2;
+		cm_id->state = IB_CM_MRA_REQ_SENT;
+		break;
+	case IB_CM_REP_RCVD:
+		ret = cm_alloc_msg(cm_id_priv, &msg);
+		if (ret)
+			goto error1;
+
+		cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
+			      CM_MSG_RESPONSE_REP, service_timeout,
+			      private_data, private_data_len);
+		ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+				       &msg->send_wr, &bad_send_wr);
+		if (ret)
+			goto error2;
+		cm_id->state = IB_CM_MRA_REP_SENT;
+		break;
+	case IB_CM_ESTABLISHED:
+		ret = cm_alloc_msg(cm_id_priv, &msg);
+		if (ret)
+			goto error1;
+
+		cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
+			      CM_MSG_RESPONSE_OTHER, service_timeout,
+			      private_data, private_data_len);
+		ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+				       &msg->send_wr, &bad_send_wr);
+		if (ret)
+			goto error2;
+		cm_id->lap_state = IB_CM_MRA_LAP_SENT;
+		break;
+	default:
+		ret = -EINVAL;
+		goto error1;
+	}
+	cm_id_priv->service_timeout = service_timeout;
+	cm_set_private_data(cm_id_priv, data, private_data_len);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return 0;
+
+error1:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	kfree(data);
+	return ret;
+
+error2:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	kfree(data);
+	cm_free_msg(msg);
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_mra);
+
+static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
+{
+	switch (cm_mra_get_msg_mraed(mra_msg)) {
+	case CM_MSG_RESPONSE_REQ:
+		return cm_acquire_id(mra_msg->remote_comm_id, 0);
+	case CM_MSG_RESPONSE_REP:
+	case CM_MSG_RESPONSE_OTHER:
+		return cm_acquire_id(mra_msg->remote_comm_id,
+				     mra_msg->local_comm_id);
+	default:
+		return NULL;
+	}
+}
+
+static int cm_mra_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_mra_msg *mra_msg;
+	unsigned long flags;
+	int timeout, ret;
+
+	mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_mraed_id(mra_msg);
+	if (!cm_id_priv)
+		return -EINVAL;
+
+	work->cm_event.private_data = &mra_msg->private_data;
+	work->cm_event.param.mra_rcvd.service_timeout =
+					cm_mra_get_service_timeout(mra_msg);
+	timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
+		  cm_convert_to_ms(cm_id_priv->av.packet_life_time);
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id_priv->id.state) {
+	case IB_CM_REQ_SENT:
+		if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
+		    ib_modify_mad(cm_id_priv->av.port->mad_agent,
+				  (unsigned long) cm_id_priv->msg, timeout))
+			goto out;
+		cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
+		break;
+	case IB_CM_REP_SENT:
+		if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
+		    ib_modify_mad(cm_id_priv->av.port->mad_agent,
+				  (unsigned long) cm_id_priv->msg, timeout))
+			goto out;
+		cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
+		break;
+	case IB_CM_ESTABLISHED:
+		if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
+		    cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
+		    ib_modify_mad(cm_id_priv->av.port->mad_agent,
+				  (unsigned long) cm_id_priv->msg, timeout))
+			goto out;
+		cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
+		break;
+	default:
+		goto out;
+	}
+
+	cm_id_priv->msg->context[1] = (void *) (unsigned long)
+				      cm_id_priv->id.state;
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+out:
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+static void cm_format_lap(struct cm_lap_msg *lap_msg,
+			  struct cm_id_private *cm_id_priv,
+			  struct ib_sa_path_rec *alternate_path,
+			  const void *private_data,
+			  u8 private_data_len)
+{
+	cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
+			  cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
+	lap_msg->local_comm_id = cm_id_priv->id.local_id;
+	lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
+	cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
+	/* todo: need remote CM response timeout */
+	cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
+	lap_msg->alt_local_lid = alternate_path->slid;
+	lap_msg->alt_remote_lid = alternate_path->dlid;
+	lap_msg->alt_local_gid = alternate_path->sgid;
+	lap_msg->alt_remote_gid = alternate_path->dgid;
+	cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
+	cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
+	lap_msg->alt_hop_limit = alternate_path->hop_limit;
+	cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
+	cm_lap_set_sl(lap_msg, alternate_path->sl);
+	cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
+	cm_lap_set_local_ack_timeout(lap_msg,
+		min(31, alternate_path->packet_life_time + 1));
+
+	if (private_data && private_data_len)
+		memcpy(lap_msg->private_data, private_data, private_data_len);
+}
+
+int ib_send_cm_lap(struct ib_cm_id *cm_id,
+		   struct ib_sa_path_rec *alternate_path,
+		   const void *private_data,
+		   u8 private_data_len)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
+		return -EINVAL;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id->state != IB_CM_ESTABLISHED ||
+	    cm_id->lap_state != IB_CM_LAP_IDLE) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = cm_alloc_msg(cm_id_priv, &msg);
+	if (ret)
+		goto out;
+
+	cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
+		      alternate_path, private_data, private_data_len);
+	msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
+	msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
+
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+			       &msg->send_wr, &bad_send_wr);
+	if (ret) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		cm_free_msg(msg);
+		return ret;
+	}
+
+	cm_id->lap_state = IB_CM_LAP_SENT;
+	cm_id_priv->msg = msg;
+
+out:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_lap);
+
+static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
+				    struct cm_lap_msg *lap_msg)
+{
+	memset(path, 0, sizeof *path);
+	path->dgid = lap_msg->alt_local_gid;
+	path->sgid = lap_msg->alt_remote_gid;
+	path->dlid = lap_msg->alt_local_lid;
+	path->slid = lap_msg->alt_remote_lid;
+	path->flow_label = cm_lap_get_flow_label(lap_msg);
+	path->hop_limit = lap_msg->alt_hop_limit;
+	path->traffic_class = cm_lap_get_traffic_class(lap_msg);
+	path->reversible = 1;
+	/* pkey is same as in REQ */
+	path->sl = cm_lap_get_sl(lap_msg);
+	path->mtu_selector = IB_SA_EQ;
+	/* mtu is same as in REQ */
+	path->rate_selector = IB_SA_EQ;
+	path->rate = cm_lap_get_packet_rate(lap_msg);
+	path->packet_life_time_selector = IB_SA_EQ;
+	path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
+	path->packet_life_time -= (path->packet_life_time > 0);
+}
+
+static int cm_lap_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_lap_msg *lap_msg;
+	struct ib_cm_lap_event_param *param;
+	struct ib_mad_send_buf *msg = NULL;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	/* todo: verify LAP request and send reject APR if invalid. */
+	lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
+				   lap_msg->local_comm_id);
+	if (!cm_id_priv)
+		return -EINVAL;
+
+	param = &work->cm_event.param.lap_rcvd;
+	param->alternate_path = &work->path[0];
+	cm_format_path_from_lap(param->alternate_path, lap_msg);
+	work->cm_event.private_data = &lap_msg->private_data;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
+		goto unlock;
+
+	switch (cm_id_priv->id.lap_state) {
+	case IB_CM_LAP_IDLE:
+		break;
+	case IB_CM_MRA_LAP_SENT:
+		if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
+			goto unlock;
+
+		cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
+			      CM_MSG_RESPONSE_OTHER,
+			      cm_id_priv->service_timeout,
+			      cm_id_priv->private_data,
+			      cm_id_priv->private_data_len);
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+		if (ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+				     &msg->send_wr, &bad_send_wr))
+			cm_free_msg(msg);
+		goto deref;
+	default:
+		goto unlock;
+	}
+
+	cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
+	cm_id_priv->tid = lap_msg->hdr.tid;
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+
+unlock:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+deref:	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+static void cm_format_apr(struct cm_apr_msg *apr_msg,
+			  struct cm_id_private *cm_id_priv,
+			  enum ib_cm_apr_status status,
+			  void *info,
+			  u8 info_length,
+			  const void *private_data,
+			  u8 private_data_len)
+{
+	cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
+	apr_msg->local_comm_id = cm_id_priv->id.local_id;
+	apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
+	apr_msg->ap_status = (u8) status;
+
+	if (info && info_length) {
+		apr_msg->info_length = info_length;
+		memcpy(apr_msg->info, info, info_length);
+	}
+
+	if (private_data && private_data_len)
+		memcpy(apr_msg->private_data, private_data, private_data_len);
+}
+
+int ib_send_cm_apr(struct ib_cm_id *cm_id,
+		   enum ib_cm_apr_status status,
+		   void *info,
+		   u8 info_length,
+		   const void *private_data,
+		   u8 private_data_len)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
+	    (info && info_length > IB_CM_APR_INFO_LENGTH))
+		return -EINVAL;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id->state != IB_CM_ESTABLISHED ||
+	    (cm_id->lap_state != IB_CM_LAP_RCVD &&
+	     cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = cm_alloc_msg(cm_id_priv, &msg);
+	if (ret)
+		goto out;
+
+	cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
+		      info, info_length, private_data, private_data_len);
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+			       &msg->send_wr, &bad_send_wr);
+	if (ret) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		cm_free_msg(msg);
+		return ret;
+	}
+
+	cm_id->lap_state = IB_CM_LAP_IDLE;
+out:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_apr);
+
+static int cm_apr_handler(struct cm_work *work)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_apr_msg *apr_msg;
+	unsigned long flags;
+	int ret;
+
+	apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
+				   apr_msg->local_comm_id);
+	if (!cm_id_priv)
+		return -EINVAL; /* Unmatched reply. */
+
+	work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
+	work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
+	work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
+	work->cm_event.private_data = &apr_msg->private_data;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
+	    (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
+	     cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		goto out;
+	}
+	cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
+	ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+		      (unsigned long) cm_id_priv->msg);
+	cm_id_priv->msg = NULL;
+
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+out:
+	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+static int cm_timewait_handler(struct cm_work *work)
+{
+	struct cm_timewait_info *timewait_info;
+	struct cm_id_private *cm_id_priv;
+	unsigned long flags;
+	int ret;
+
+	timewait_info = (struct cm_timewait_info *)work;
+	cm_cleanup_timewait(timewait_info);
+
+	cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
+				   timewait_info->work.remote_id);
+	if (!cm_id_priv)
+		return -EINVAL;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
+	    cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		goto out;
+	}
+	cm_id_priv->id.state = IB_CM_IDLE;
+	ret = atomic_inc_and_test(&cm_id_priv->work_count);
+	if (!ret)
+		list_add_tail(&work->list, &cm_id_priv->work_list);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret)
+		cm_process_work(cm_id_priv, work);
+	else
+		cm_deref_id(cm_id_priv);
+	return 0;
+out:
+	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
+			       struct cm_id_private *cm_id_priv,
+			       struct ib_cm_sidr_req_param *param)
+{
+	cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
+			  cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
+	sidr_req_msg->request_id = cm_id_priv->id.local_id;
+	sidr_req_msg->pkey = param->pkey;
+	sidr_req_msg->service_id = param->service_id;
+
+	if (param->private_data && param->private_data_len)
+		memcpy(sidr_req_msg->private_data, param->private_data,
+		       param->private_data_len);
+}
+
+int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
+			struct ib_cm_sidr_req_param *param)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	if (!param->path || (param->private_data &&
+	     param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
+		return -EINVAL;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
+	if (ret)
+		goto out;
+
+	cm_id->service_id = param->service_id;
+	cm_id->service_mask = ~0ULL;
+	cm_id_priv->timeout_ms = param->timeout_ms;
+	cm_id_priv->max_cm_retries = param->max_cm_retries;
+	ret = cm_alloc_msg(cm_id_priv, &msg);
+	if (ret)
+		goto out;
+
+	cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
+			   param);
+	msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
+	msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id->state == IB_CM_IDLE)
+		ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+				       &msg->send_wr, &bad_send_wr);
+	else
+		ret = -EINVAL;
+
+	if (ret) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		cm_free_msg(msg);
+		goto out;
+	}
+	cm_id->state = IB_CM_SIDR_REQ_SENT;
+	cm_id_priv->msg = msg;
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+out:
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_sidr_req);
+
+static void cm_format_sidr_req_event(struct cm_work *work,
+				     struct ib_cm_id *listen_id)
+{
+	struct cm_sidr_req_msg *sidr_req_msg;
+	struct ib_cm_sidr_req_event_param *param;
+
+	sidr_req_msg = (struct cm_sidr_req_msg *)
+				work->mad_recv_wc->recv_buf.mad;
+	param = &work->cm_event.param.sidr_req_rcvd;
+	param->pkey = sidr_req_msg->pkey;
+	param->listen_id = listen_id;
+	param->device = work->port->mad_agent->device;
+	param->port = work->port->port_num;
+	work->cm_event.private_data = &sidr_req_msg->private_data;
+}
+
+static int cm_sidr_req_handler(struct cm_work *work)
+{
+	struct ib_cm_id *cm_id;
+	struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
+	struct cm_sidr_req_msg *sidr_req_msg;
+	struct ib_wc *wc;
+	unsigned long flags;
+
+	cm_id = ib_create_cm_id(NULL, NULL);
+	if (IS_ERR(cm_id))
+		return PTR_ERR(cm_id);
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+
+	/* Record SGID/SLID and request ID for lookup. */
+	sidr_req_msg = (struct cm_sidr_req_msg *)
+				work->mad_recv_wc->recv_buf.mad;
+	wc = work->mad_recv_wc->wc;
+	cm_id_priv->av.dgid.global.subnet_prefix = wc->slid;
+	cm_id_priv->av.dgid.global.interface_id = 0;
+	cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
+				&cm_id_priv->av);
+	cm_id_priv->id.remote_id = sidr_req_msg->request_id;
+	cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
+	cm_id_priv->tid = sidr_req_msg->hdr.tid;
+	atomic_inc(&cm_id_priv->work_count);
+
+	spin_lock_irqsave(&cm.lock, flags);
+	cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
+	if (cur_cm_id_priv) {
+		spin_unlock_irqrestore(&cm.lock, flags);
+		goto out; /* Duplicate message. */
+	}
+	cur_cm_id_priv = cm_find_listen(sidr_req_msg->service_id);
+	if (!cur_cm_id_priv) {
+		rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
+		spin_unlock_irqrestore(&cm.lock, flags);
+		/* todo: reply with no match */
+		goto out; /* No match. */
+	}
+	atomic_inc(&cur_cm_id_priv->refcount);
+	spin_unlock_irqrestore(&cm.lock, flags);
+
+	cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
+	cm_id_priv->id.context = cur_cm_id_priv->id.context;
+	cm_id_priv->id.service_id = sidr_req_msg->service_id;
+	cm_id_priv->id.service_mask = ~0ULL;
+
+	cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
+	cm_process_work(cm_id_priv, work);
+	cm_deref_id(cur_cm_id_priv);
+	return 0;
+out:
+	ib_destroy_cm_id(&cm_id_priv->id);
+	return -EINVAL;
+}
+
+static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
+			       struct cm_id_private *cm_id_priv,
+			       struct ib_cm_sidr_rep_param *param)
+{
+	cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
+			  cm_id_priv->tid);
+	sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
+	sidr_rep_msg->status = param->status;
+	cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
+	sidr_rep_msg->service_id = cm_id_priv->id.service_id;
+	sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
+
+	if (param->info && param->info_length)
+		memcpy(sidr_rep_msg->info, param->info, param->info_length);
+
+	if (param->private_data && param->private_data_len)
+		memcpy(sidr_rep_msg->private_data, param->private_data,
+		       param->private_data_len);
+}
+
+int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
+			struct ib_cm_sidr_rep_param *param)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_mad_send_buf *msg;
+	struct ib_send_wr *bad_send_wr;
+	unsigned long flags;
+	int ret;
+
+	if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
+	    (param->private_data &&
+	     param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
+		return -EINVAL;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
+		ret = -EINVAL;
+		goto error;
+	}
+
+	ret = cm_alloc_msg(cm_id_priv, &msg);
+	if (ret)
+		goto error;
+
+	cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
+			   param);
+	ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
+			       &msg->send_wr, &bad_send_wr);
+	if (ret) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		cm_free_msg(msg);
+		return ret;
+	}
+	cm_id->state = IB_CM_IDLE;
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	spin_lock_irqsave(&cm.lock, flags);
+	rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
+	spin_unlock_irqrestore(&cm.lock, flags);
+	return 0;
+
+error:	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(ib_send_cm_sidr_rep);
+
+static void cm_format_sidr_rep_event(struct cm_work *work)
+{
+	struct cm_sidr_rep_msg *sidr_rep_msg;
+	struct ib_cm_sidr_rep_event_param *param;
+
+	sidr_rep_msg = (struct cm_sidr_rep_msg *)
+				work->mad_recv_wc->recv_buf.mad;
+	param = &work->cm_event.param.sidr_rep_rcvd;
+	param->status = sidr_rep_msg->status;
+	param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
+	param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
+	param->info = &sidr_rep_msg->info;
+	param->info_len = sidr_rep_msg->info_length;
+	work->cm_event.private_data = &sidr_rep_msg->private_data;
+}
+
+static int cm_sidr_rep_handler(struct cm_work *work)
+{
+	struct cm_sidr_rep_msg *sidr_rep_msg;
+	struct cm_id_private *cm_id_priv;
+	unsigned long flags;
+
+	sidr_rep_msg = (struct cm_sidr_rep_msg *)
+				work->mad_recv_wc->recv_buf.mad;
+	cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
+	if (!cm_id_priv)
+		return -EINVAL; /* Unmatched reply. */
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
+		spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+		goto out;
+	}
+	cm_id_priv->id.state = IB_CM_IDLE;
+	ib_cancel_mad(cm_id_priv->av.port->mad_agent,
+		      (unsigned long) cm_id_priv->msg);
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	cm_format_sidr_rep_event(work);
+	cm_process_work(cm_id_priv, work);
+	return 0;
+out:
+	cm_deref_id(cm_id_priv);
+	return -EINVAL;
+}
+
+static void cm_process_send_error(struct ib_mad_send_buf *msg,
+				  enum ib_wc_status wc_status)
+{
+	struct cm_id_private *cm_id_priv;
+	struct ib_cm_event cm_event;
+	enum ib_cm_state state;
+	unsigned long flags;
+	int ret;
+
+	memset(&cm_event, 0, sizeof cm_event);
+	cm_id_priv = msg->context[0];
+
+	/* Discard old sends or ones without a response. */
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	state = (enum ib_cm_state) (unsigned long) msg->context[1];
+	if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
+		goto discard;
+
+	switch (state) {
+	case IB_CM_REQ_SENT:
+	case IB_CM_MRA_REQ_RCVD:
+		cm_reset_to_idle(cm_id_priv);
+		cm_event.event = IB_CM_REQ_ERROR;
+		break;
+	case IB_CM_REP_SENT:
+	case IB_CM_MRA_REP_RCVD:
+		cm_reset_to_idle(cm_id_priv);
+		cm_event.event = IB_CM_REP_ERROR;
+		break;
+	case IB_CM_DREQ_SENT:
+		cm_enter_timewait(cm_id_priv);
+		cm_event.event = IB_CM_DREQ_ERROR;
+		break;
+	case IB_CM_SIDR_REQ_SENT:
+		cm_id_priv->id.state = IB_CM_IDLE;
+		cm_event.event = IB_CM_SIDR_REQ_ERROR;
+		break;
+	default:
+		goto discard;
+	}
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	cm_event.param.send_status = wc_status;
+
+	/* No other events can occur on the cm_id at this point. */
+	ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
+	cm_free_msg(msg);
+	if (ret)
+		ib_destroy_cm_id(&cm_id_priv->id);
+	return;
+discard:
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	cm_free_msg(msg);
+}
+
+static void cm_send_handler(struct ib_mad_agent *mad_agent,
+			    struct ib_mad_send_wc *mad_send_wc)
+{
+	struct ib_mad_send_buf *msg;
+
+	msg = (struct ib_mad_send_buf *)(unsigned long)mad_send_wc->wr_id;
+
+	switch (mad_send_wc->status) {
+	case IB_WC_SUCCESS:
+	case IB_WC_WR_FLUSH_ERR:
+		cm_free_msg(msg);
+		break;
+	default:
+		if (msg->context[0] && msg->context[1])
+			cm_process_send_error(msg, mad_send_wc->status);
+		else
+			cm_free_msg(msg);
+		break;
+	}
+}
+
+static void cm_work_handler(void *data)
+{
+	struct cm_work *work = data;
+	int ret;
+
+	switch (work->cm_event.event) {
+	case IB_CM_REQ_RECEIVED:
+		ret = cm_req_handler(work);
+		break;
+	case IB_CM_MRA_RECEIVED:
+		ret = cm_mra_handler(work);
+		break;
+	case IB_CM_REJ_RECEIVED:
+		ret = cm_rej_handler(work);
+		break;
+	case IB_CM_REP_RECEIVED:
+		ret = cm_rep_handler(work);
+		break;
+	case IB_CM_RTU_RECEIVED:
+		ret = cm_rtu_handler(work);
+		break;
+	case IB_CM_USER_ESTABLISHED:
+		ret = cm_establish_handler(work);
+		break;
+	case IB_CM_DREQ_RECEIVED:
+		ret = cm_dreq_handler(work);
+		break;
+	case IB_CM_DREP_RECEIVED:
+		ret = cm_drep_handler(work);
+		break;
+	case IB_CM_SIDR_REQ_RECEIVED:
+		ret = cm_sidr_req_handler(work);
+		break;
+	case IB_CM_SIDR_REP_RECEIVED:
+		ret = cm_sidr_rep_handler(work);
+		break;
+	case IB_CM_LAP_RECEIVED:
+		ret = cm_lap_handler(work);
+		break;
+	case IB_CM_APR_RECEIVED:
+		ret = cm_apr_handler(work);
+		break;
+	case IB_CM_TIMEWAIT_EXIT:
+		ret = cm_timewait_handler(work);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	if (ret)
+		cm_free_work(work);
+}
+
+int ib_cm_establish(struct ib_cm_id *cm_id)
+{
+	struct cm_id_private *cm_id_priv;
+	struct cm_work *work;
+	unsigned long flags;
+	int ret = 0;
+
+	work = kmalloc(sizeof *work, GFP_ATOMIC);
+	if (!work)
+		return -ENOMEM;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id->state)
+	{
+	case IB_CM_REP_SENT:
+	case IB_CM_MRA_REP_RCVD:
+		cm_id->state = IB_CM_ESTABLISHED;
+		break;
+	case IB_CM_ESTABLISHED:
+		ret = -EISCONN;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+
+	if (ret) {
+		kfree(work);
+		goto out;
+	}
+
+	/*
+	 * The CM worker thread may try to destroy the cm_id before it
+	 * can execute this work item.  To prevent potential deadlock,
+	 * we need to find the cm_id once we're in the context of the
+	 * worker thread, rather than holding a reference on it.
+	 */
+	INIT_WORK(&work->work, cm_work_handler, work);
+	work->local_id = cm_id->local_id;
+	work->remote_id = cm_id->remote_id;
+	work->mad_recv_wc = NULL;
+	work->cm_event.event = IB_CM_USER_ESTABLISHED;
+	queue_work(cm.wq, &work->work);
+out:
+	return ret;
+}
+EXPORT_SYMBOL(ib_cm_establish);
+
+static void cm_recv_handler(struct ib_mad_agent *mad_agent,
+			    struct ib_mad_recv_wc *mad_recv_wc)
+{
+	struct cm_work *work;
+	enum ib_cm_event_type event;
+	int paths = 0;
+
+	switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
+	case CM_REQ_ATTR_ID:
+		paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
+						    alt_local_lid != 0);
+		event = IB_CM_REQ_RECEIVED;
+		break;
+	case CM_MRA_ATTR_ID:
+		event = IB_CM_MRA_RECEIVED;
+		break;
+	case CM_REJ_ATTR_ID:
+		event = IB_CM_REJ_RECEIVED;
+		break;
+	case CM_REP_ATTR_ID:
+		event = IB_CM_REP_RECEIVED;
+		break;
+	case CM_RTU_ATTR_ID:
+		event = IB_CM_RTU_RECEIVED;
+		break;
+	case CM_DREQ_ATTR_ID:
+		event = IB_CM_DREQ_RECEIVED;
+		break;
+	case CM_DREP_ATTR_ID:
+		event = IB_CM_DREP_RECEIVED;
+		break;
+	case CM_SIDR_REQ_ATTR_ID:
+		event = IB_CM_SIDR_REQ_RECEIVED;
+		break;
+	case CM_SIDR_REP_ATTR_ID:
+		event = IB_CM_SIDR_REP_RECEIVED;
+		break;
+	case CM_LAP_ATTR_ID:
+		paths = 1;
+		event = IB_CM_LAP_RECEIVED;
+		break;
+	case CM_APR_ATTR_ID:
+		event = IB_CM_APR_RECEIVED;
+		break;
+	default:
+		ib_free_recv_mad(mad_recv_wc);
+		return;
+	}
+
+	work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
+		       GFP_KERNEL);
+	if (!work) {
+		ib_free_recv_mad(mad_recv_wc);
+		return;
+	}
+
+	INIT_WORK(&work->work, cm_work_handler, work);
+	work->cm_event.event = event;
+	work->mad_recv_wc = mad_recv_wc;
+	work->port = (struct cm_port *)mad_agent->context;
+	queue_work(cm.wq, &work->work);
+}
+
+static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
+				struct ib_qp_attr *qp_attr,
+				int *qp_attr_mask)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id_priv->id.state) {
+	case IB_CM_REQ_SENT:
+	case IB_CM_MRA_REQ_RCVD:
+	case IB_CM_REQ_RCVD:
+	case IB_CM_MRA_REQ_SENT:
+	case IB_CM_REP_RCVD:
+	case IB_CM_MRA_REP_SENT:
+	case IB_CM_REP_SENT:
+	case IB_CM_MRA_REP_RCVD:
+	case IB_CM_ESTABLISHED:
+		*qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
+				IB_QP_PKEY_INDEX | IB_QP_PORT;
+		qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE;
+		if (cm_id_priv->responder_resources)
+			qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_WRITE |
+						    IB_ACCESS_REMOTE_READ;
+		qp_attr->pkey_index = cm_id_priv->av.pkey_index;
+		qp_attr->port_num = cm_id_priv->av.port->port_num;
+		ret = 0;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+
+static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
+			       struct ib_qp_attr *qp_attr,
+			       int *qp_attr_mask)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id_priv->id.state) {
+	case IB_CM_REQ_RCVD:
+	case IB_CM_MRA_REQ_SENT:
+	case IB_CM_REP_RCVD:
+	case IB_CM_MRA_REP_SENT:
+	case IB_CM_REP_SENT:
+	case IB_CM_MRA_REP_RCVD:
+	case IB_CM_ESTABLISHED:
+		*qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
+				IB_QP_DEST_QPN | IB_QP_RQ_PSN |
+				IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
+		qp_attr->ah_attr = cm_id_priv->av.ah_attr;
+		qp_attr->path_mtu = cm_id_priv->path_mtu;
+		qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
+		qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
+		qp_attr->max_dest_rd_atomic = cm_id_priv->responder_resources;
+		qp_attr->min_rnr_timer = 0;
+		if (cm_id_priv->alt_av.ah_attr.dlid) {
+			*qp_attr_mask |= IB_QP_ALT_PATH;
+			qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
+		}
+		ret = 0;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+
+static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
+			       struct ib_qp_attr *qp_attr,
+			       int *qp_attr_mask)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&cm_id_priv->lock, flags);
+	switch (cm_id_priv->id.state) {
+	case IB_CM_REP_RCVD:
+	case IB_CM_MRA_REP_SENT:
+	case IB_CM_REP_SENT:
+	case IB_CM_MRA_REP_RCVD:
+	case IB_CM_ESTABLISHED:
+		*qp_attr_mask = IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
+				IB_QP_RNR_RETRY | IB_QP_SQ_PSN |
+				IB_QP_MAX_QP_RD_ATOMIC;
+		qp_attr->timeout = cm_id_priv->local_ack_timeout;
+		qp_attr->retry_cnt = cm_id_priv->retry_count;
+		qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
+		qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
+		qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
+		if (cm_id_priv->alt_av.ah_attr.dlid) {
+			*qp_attr_mask |= IB_QP_PATH_MIG_STATE;
+			qp_attr->path_mig_state = IB_MIG_REARM;
+		}
+		ret = 0;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	spin_unlock_irqrestore(&cm_id_priv->lock, flags);
+	return ret;
+}
+
+int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
+		       struct ib_qp_attr *qp_attr,
+		       int *qp_attr_mask)
+{
+	struct cm_id_private *cm_id_priv;
+	int ret;
+
+	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
+	switch (qp_attr->qp_state) {
+	case IB_QPS_INIT:
+		ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
+		break;
+	case IB_QPS_RTR:
+		ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
+		break;
+	case IB_QPS_RTS:
+		ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+EXPORT_SYMBOL(ib_cm_init_qp_attr);
+
+static u64 cm_get_ca_guid(struct ib_device *device)
+{
+	struct ib_device_attr *device_attr;
+	u64 guid;
+	int ret;
+
+	device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
+	if (!device_attr)
+		return 0;
+
+	ret = ib_query_device(device, device_attr);
+	guid = ret ? 0 : device_attr->node_guid;
+	kfree(device_attr);
+	return guid;
+}
+
+static void cm_add_one(struct ib_device *device)
+{
+	struct cm_device *cm_dev;
+	struct cm_port *port;
+	struct ib_mad_reg_req reg_req = {
+		.mgmt_class = IB_MGMT_CLASS_CM,
+		.mgmt_class_version = IB_CM_CLASS_VERSION
+	};
+	struct ib_port_modify port_modify = {
+		.set_port_cap_mask = IB_PORT_CM_SUP
+	};
+	unsigned long flags;
+	int ret;
+	u8 i;
+
+	cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
+			 device->phys_port_cnt, GFP_KERNEL);
+	if (!cm_dev)
+		return;
+
+	cm_dev->device = device;
+	cm_dev->ca_guid = cm_get_ca_guid(device);
+	if (!cm_dev->ca_guid)
+		goto error1;
+
+	set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
+	for (i = 1; i <= device->phys_port_cnt; i++) {
+		port = &cm_dev->port[i-1];
+		port->cm_dev = cm_dev;
+		port->port_num = i;
+		port->mad_agent = ib_register_mad_agent(device, i,
+							IB_QPT_GSI,
+							&reg_req,
+							0,
+							cm_send_handler,
+							cm_recv_handler,
+							port);
+		if (IS_ERR(port->mad_agent))
+			goto error2;
+
+		ret = ib_modify_port(device, i, 0, &port_modify);
+		if (ret)
+			goto error3;
+	}
+	ib_set_client_data(device, &cm_client, cm_dev);
+
+	write_lock_irqsave(&cm.device_lock, flags);
+	list_add_tail(&cm_dev->list, &cm.device_list);
+	write_unlock_irqrestore(&cm.device_lock, flags);
+	return;
+
+error3:
+	ib_unregister_mad_agent(port->mad_agent);
+error2:
+	port_modify.set_port_cap_mask = 0;
+	port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
+	while (--i) {
+		port = &cm_dev->port[i-1];
+		ib_modify_port(device, port->port_num, 0, &port_modify);
+		ib_unregister_mad_agent(port->mad_agent);
+	}
+error1:
+	kfree(cm_dev);
+}
+
+static void cm_remove_one(struct ib_device *device)
+{
+	struct cm_device *cm_dev;
+	struct cm_port *port;
+	struct ib_port_modify port_modify = {
+		.clr_port_cap_mask = IB_PORT_CM_SUP
+	};
+	unsigned long flags;
+	int i;
+
+	cm_dev = ib_get_client_data(device, &cm_client);
+	if (!cm_dev)
+		return;
+
+	write_lock_irqsave(&cm.device_lock, flags);
+	list_del(&cm_dev->list);
+	write_unlock_irqrestore(&cm.device_lock, flags);
+
+	for (i = 1; i <= device->phys_port_cnt; i++) {
+		port = &cm_dev->port[i-1];
+		ib_modify_port(device, port->port_num, 0, &port_modify);
+		ib_unregister_mad_agent(port->mad_agent);
+	}
+	kfree(cm_dev);
+}
+
+static int __init ib_cm_init(void)
+{
+	int ret;
+
+	memset(&cm, 0, sizeof cm);
+	INIT_LIST_HEAD(&cm.device_list);
+	rwlock_init(&cm.device_lock);
+	spin_lock_init(&cm.lock);
+	cm.listen_service_table = RB_ROOT;
+	cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
+	cm.remote_id_table = RB_ROOT;
+	cm.remote_qp_table = RB_ROOT;
+	cm.remote_sidr_table = RB_ROOT;
+	idr_init(&cm.local_id_table);
+	idr_pre_get(&cm.local_id_table, GFP_KERNEL);
+
+	cm.wq = create_workqueue("ib_cm");
+	if (!cm.wq)
+		return -ENOMEM;
+
+	ret = ib_register_client(&cm_client);
+	if (ret)
+		goto error;
+
+	return 0;
+error:
+	destroy_workqueue(cm.wq);
+	return ret;
+}
+
+static void __exit ib_cm_cleanup(void)
+{
+	flush_workqueue(cm.wq);
+	destroy_workqueue(cm.wq);
+	ib_unregister_client(&cm_client);
+}
+
+module_init(ib_cm_init);
+module_exit(ib_cm_cleanup);
+

drivers/infiniband/core/cm_msgs.h

+/*
+ * Copyright (c) 2004 Intel Corporation.  All rights reserved.
+ * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
+ * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING the madirectory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use source and binary forms, with or
+ *     withmodification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retathe above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHWARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS THE
+ * SOFTWARE.
+ */
+#if !defined(CM_MSGS_H)
+#define CM_MSGS_H
+
+#include <ib_mad.h>
+
+/*
+ * Parameters to routines below should be in network-byte order, and values
+ * are returned in network-byte order.
+ */
+
+#define IB_CM_CLASS_VERSION	2 /* IB specification 1.2 */
+
+enum cm_msg_attr_id {
+	CM_REQ_ATTR_ID	    = __constant_htons(0x0010),
+	CM_MRA_ATTR_ID	    = __constant_htons(0x0011),
+	CM_REJ_ATTR_ID	    = __constant_htons(0x0012),
+	CM_REP_ATTR_ID	    = __constant_htons(0x0013),
+	CM_RTU_ATTR_ID	    = __constant_htons(0x0014),
+	CM_DREQ_ATTR_ID	    = __constant_htons(0x0015),
+	CM_DREP_ATTR_ID	    = __constant_htons(0x0016),
+	CM_SIDR_REQ_ATTR_ID = __constant_htons(0x0017),
+	CM_SIDR_REP_ATTR_ID = __constant_htons(0x0018),
+	CM_LAP_ATTR_ID      = __constant_htons(0x0019),
+	CM_APR_ATTR_ID      = __constant_htons(0x001A)
+};
+
+enum cm_msg_sequence {
+	CM_MSG_SEQUENCE_REQ,
+	CM_MSG_SEQUENCE_LAP,
+	CM_MSG_SEQUENCE_DREQ,
+	CM_MSG_SEQUENCE_SIDR
+};
+
+struct cm_req_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 local_comm_id;
+	u32 rsvd4;
+	u64 service_id;
+	u64 local_ca_guid;
+	u32 rsvd24;
+	u32 local_qkey;
+	/* local QPN:24, responder resources:8 */
+	u32 offset32;
+	/* local EECN:24, initiator depth:8 */
+	u32 offset36;
+	/*
+	 * remote EECN:24, remote CM response timeout:5,
+	 * transport service type:2, end-to-end flow control:1
+	 */
+	u32 offset40;
+	/* starting PSN:24, local CM response timeout:5, retry count:3 */
+	u32 offset44;
+	u16 pkey;
+	/* path MTU:4, RDC exists:1, RNR retry count:3. */
+	u8 offset50;
+	/* max CM Retries:4, SRQ:1, rsvd:3 */
+	u8 offset51;
+
+	u16 primary_local_lid;
+	u16 primary_remote_lid;
+	union ib_gid primary_local_gid;
+	union ib_gid primary_remote_gid;
+	/* flow label:20, rsvd:6, packet rate:6 */
+	u32 primary_offset88;
+	u8 primary_traffic_class;
+	u8 primary_hop_limit;
+	/* SL:4, subnet local:1, rsvd:3 */
+	u8 primary_offset94;
+	/* local ACK timeout:5, rsvd:3 */
+	u8 primary_offset95;
+
+	u16 alt_local_lid;
+	u16 alt_remote_lid;
+	union ib_gid alt_local_gid;
+	union ib_gid alt_remote_gid;
+	/* flow label:20, rsvd:6, packet rate:6 */
+	u32 alt_offset132;
+	u8 alt_traffic_class;
+	u8 alt_hop_limit;
+	/* SL:4, subnet local:1, rsvd:3 */
+	u8 alt_offset138;
+	/* local ACK timeout:5, rsvd:3 */
+	u8 alt_offset139;
+
+	u8 private_data[IB_CM_REQ_PRIVATE_DATA_SIZE];
+
+} __attribute__ ((packed));
+
+static inline u32 cm_req_get_local_qpn(struct cm_req_msg *req_msg)
+{
+	return cpu_to_be32(be32_to_cpu(req_msg->offset32) >> 8);
+}
+
+static inline void cm_req_set_local_qpn(struct cm_req_msg *req_msg, u32 qpn)
+{
+	req_msg->offset32 = cpu_to_be32((be32_to_cpu(qpn) << 8) |
+					 (be32_to_cpu(req_msg->offset32) &
+					  0x000000FF));
+}
+
+static inline u8 cm_req_get_resp_res(struct cm_req_msg *req_msg)
+{
+	return (u8) be32_to_cpu(req_msg->offset32);
+}
+
+static inline void cm_req_set_resp_res(struct cm_req_msg *req_msg, u8 resp_res)
+{
+	req_msg->offset32 = cpu_to_be32(resp_res |
+					(be32_to_cpu(req_msg->offset32) &
+					 0xFFFFFF00));
+}
+
+static inline u8 cm_req_get_init_depth(struct cm_req_msg *req_msg)
+{
+	return (u8) be32_to_cpu(req_msg->offset36);
+}
+
+static inline void cm_req_set_init_depth(struct cm_req_msg *req_msg,
+					 u8 init_depth)
+{
+	req_msg->offset36 = cpu_to_be32(init_depth |
+					(be32_to_cpu(req_msg->offset36) &
+					 0xFFFFFF00));
+}
+
+static inline u8 cm_req_get_remote_resp_timeout(struct cm_req_msg *req_msg)
+{
+	return (u8) ((be32_to_cpu(req_msg->offset40) & 0xF8) >> 3);
+}
+
+static inline void cm_req_set_remote_resp_timeout(struct cm_req_msg *req_msg,
+						  u8 resp_timeout)
+{
+	req_msg->offset40 = cpu_to_be32((resp_timeout << 3) |
+					 (be32_to_cpu(req_msg->offset40) &
+					  0xFFFFFF07));
+}
+
+static inline enum ib_qp_type cm_req_get_qp_type(struct cm_req_msg *req_msg)
+{
+	u8 transport_type = (u8) (be32_to_cpu(req_msg->offset40) & 0x06) >> 1;
+	switch(transport_type) {
+	case 0: return IB_QPT_RC;
+	case 1: return IB_QPT_UC;
+	default: return 0;
+	}
+}
+
+static inline void cm_req_set_qp_type(struct cm_req_msg *req_msg,
+				      enum ib_qp_type qp_type)
+{
+	switch(qp_type) {
+	case IB_QPT_UC:
+		req_msg->offset40 = cpu_to_be32((be32_to_cpu(
+						  req_msg->offset40) &
+						   0xFFFFFFF9) | 0x2);
+	default:
+		req_msg->offset40 = cpu_to_be32(be32_to_cpu(
+						 req_msg->offset40) &
+						  0xFFFFFFF9);
+	}
+}
+
+static inline u8 cm_req_get_flow_ctrl(struct cm_req_msg *req_msg)
+{
+	return be32_to_cpu(req_msg->offset40) & 0x1;
+}
+
+static inline void cm_req_set_flow_ctrl(struct cm_req_msg *req_msg,
+					u8 flow_ctrl)
+{
+	req_msg->offset40 = cpu_to_be32((flow_ctrl & 0x1) |
+					 (be32_to_cpu(req_msg->offset40) &
+					  0xFFFFFFFE));
+}
+
+static inline u32 cm_req_get_starting_psn(struct cm_req_msg *req_msg)
+{
+	return cpu_to_be32(be32_to_cpu(req_msg->offset44) >> 8);
+}
+
+static inline void cm_req_set_starting_psn(struct cm_req_msg *req_msg,
+					   u32 starting_psn)
+{
+	req_msg->offset44 = cpu_to_be32((be32_to_cpu(starting_psn) << 8) |
+			    (be32_to_cpu(req_msg->offset44) & 0x000000FF));
+}
+
+static inline u8 cm_req_get_local_resp_timeout(struct cm_req_msg *req_msg)
+{
+	return (u8) ((be32_to_cpu(req_msg->offset44) & 0xF8) >> 3);
+}
+
+static inline void cm_req_set_local_resp_timeout(struct cm_req_msg *req_msg,
+						 u8 resp_timeout)
+{
+	req_msg->offset44 = cpu_to_be32((resp_timeout << 3) |
+			    (be32_to_cpu(req_msg->offset44) & 0xFFFFFF07));
+}
+
+static inline u8 cm_req_get_retry_count(struct cm_req_msg *req_msg)
+{
+	return (u8) (be32_to_cpu(req_msg->offset44) & 0x7);
+}
+
+static inline void cm_req_set_retry_count(struct cm_req_msg *req_msg,
+					  u8 retry_count)
+{
+	req_msg->offset44 = cpu_to_be32((retry_count & 0x7) |
+			    (be32_to_cpu(req_msg->offset44) & 0xFFFFFFF8));
+}
+
+static inline u8 cm_req_get_path_mtu(struct cm_req_msg *req_msg)
+{
+	return req_msg->offset50 >> 4;
+}
+
+static inline void cm_req_set_path_mtu(struct cm_req_msg *req_msg, u8 path_mtu)
+{
+	req_msg->offset50 = (u8) ((req_msg->offset50 & 0xF) | (path_mtu << 4));
+}
+
+static inline u8 cm_req_get_rnr_retry_count(struct cm_req_msg *req_msg)
+{
+	return req_msg->offset50 & 0x7;
+}
+
+static inline void cm_req_set_rnr_retry_count(struct cm_req_msg *req_msg,
+					      u8 rnr_retry_count)
+{
+	req_msg->offset50 = (u8) ((req_msg->offset50 & 0xF8) |
+				  (rnr_retry_count & 0x7));
+}
+
+static inline u8 cm_req_get_max_cm_retries(struct cm_req_msg *req_msg)
+{
+	return req_msg->offset51 >> 4;
+}
+
+static inline void cm_req_set_max_cm_retries(struct cm_req_msg *req_msg,
+					     u8 retries)
+{
+	req_msg->offset51 = (u8) ((req_msg->offset51 & 0xF) | (retries << 4));
+}
+
+static inline u8 cm_req_get_srq(struct cm_req_msg *req_msg)
+{
+	return (req_msg->offset51 & 0x8) >> 3;
+}
+
+static inline void cm_req_set_srq(struct cm_req_msg *req_msg, u8 srq)
+{
+	req_msg->offset51 = (u8) ((req_msg->offset51 & 0xF7) |
+				  ((srq & 0x1) << 3));
+}
+
+static inline u32 cm_req_get_primary_flow_label(struct cm_req_msg *req_msg)
+{
+	return cpu_to_be32((be32_to_cpu(req_msg->primary_offset88) >> 12));
+}
+
+static inline void cm_req_set_primary_flow_label(struct cm_req_msg *req_msg,
+						 u32 flow_label)
+{
+	req_msg->primary_offset88 = cpu_to_be32(
+				    (be32_to_cpu(req_msg->primary_offset88) &
+				     0x00000FFF) |
+				     (be32_to_cpu(flow_label) << 12));
+}
+
+static inline u8 cm_req_get_primary_packet_rate(struct cm_req_msg *req_msg)
+{
+	return (u8) (be32_to_cpu(req_msg->primary_offset88) & 0x3F);
+}
+
+static inline void cm_req_set_primary_packet_rate(struct cm_req_msg *req_msg,
+						  u8 rate)
+{
+	req_msg->primary_offset88 = cpu_to_be32(
+				    (be32_to_cpu(req_msg->primary_offset88) &
+				     0xFFFFFFC0) | (rate & 0x3F));
+}
+
+static inline u8 cm_req_get_primary_sl(struct cm_req_msg *req_msg)
+{
+	return (u8) (req_msg->primary_offset94 >> 4);
+}
+
+static inline void cm_req_set_primary_sl(struct cm_req_msg *req_msg, u8 sl)
+{
+	req_msg->primary_offset94 = (u8) ((req_msg->primary_offset94 & 0x0F) |
+					  (sl << 4));
+}
+
+static inline u8 cm_req_get_primary_subnet_local(struct cm_req_msg *req_msg)
+{
+	return (u8) ((req_msg->primary_offset94 & 0x08) >> 3);
+}
+
+static inline void cm_req_set_primary_subnet_local(struct cm_req_msg *req_msg,
+						   u8 subnet_local)
+{
+	req_msg->primary_offset94 = (u8) ((req_msg->primary_offset94 & 0xF7) |
+					  ((subnet_local & 0x1) << 3));
+}
+
+static inline u8 cm_req_get_primary_local_ack_timeout(struct cm_req_msg *req_msg)
+{
+	return (u8) (req_msg->primary_offset95 >> 3);
+}
+
+static inline void cm_req_set_primary_local_ack_timeout(struct cm_req_msg *req_msg,
+							u8 local_ack_timeout)
+{
+	req_msg->primary_offset95 = (u8) ((req_msg->primary_offset95 & 0x07) |
+					  (local_ack_timeout << 3));
+}
+
+static inline u32 cm_req_get_alt_flow_label(struct cm_req_msg *req_msg)
+{
+	return cpu_to_be32((be32_to_cpu(req_msg->alt_offset132) >> 12));
+}
+
+static inline void cm_req_set_alt_flow_label(struct cm_req_msg *req_msg,
+					     u32 flow_label)
+{
+	req_msg->alt_offset132 = cpu_to_be32(
+				 (be32_to_cpu(req_msg->alt_offset132) &
+				  0x00000FFF) |
+				  (be32_to_cpu(flow_label) << 12));
+}
+
+static inline u8 cm_req_get_alt_packet_rate(struct cm_req_msg *req_msg)
+{
+	return (u8) (be32_to_cpu(req_msg->alt_offset132) & 0x3F);
+}
+
+static inline void cm_req_set_alt_packet_rate(struct cm_req_msg *req_msg,
+					      u8 rate)
+{
+	req_msg->alt_offset132 = cpu_to_be32(
+				 (be32_to_cpu(req_msg->alt_offset132) &
+				  0xFFFFFFC0) | (rate & 0x3F));
+}
+
+static inline u8 cm_req_get_alt_sl(struct cm_req_msg *req_msg)
+{
+	return (u8) (req_msg->alt_offset138 >> 4);
+}
+
+static inline void cm_req_set_alt_sl(struct cm_req_msg *req_msg, u8 sl)
+{
+	req_msg->alt_offset138 = (u8) ((req_msg->alt_offset138 & 0x0F) |
+				       (sl << 4));
+}
+
+static inline u8 cm_req_get_alt_subnet_local(struct cm_req_msg *req_msg)
+{
+	return (u8) ((req_msg->alt_offset138 & 0x08) >> 3);
+}
+
+static inline void cm_req_set_alt_subnet_local(struct cm_req_msg *req_msg,
+					       u8 subnet_local)
+{
+	req_msg->alt_offset138 = (u8) ((req_msg->alt_offset138 & 0xF7) |
+				       ((subnet_local & 0x1) << 3));
+}
+
+static inline u8 cm_req_get_alt_local_ack_timeout(struct cm_req_msg *req_msg)
+{
+	return (u8) (req_msg->alt_offset139 >> 3);
+}
+
+static inline void cm_req_set_alt_local_ack_timeout(struct cm_req_msg *req_msg,
+						    u8 local_ack_timeout)
+{
+	req_msg->alt_offset139 = (u8) ((req_msg->alt_offset139 & 0x07) |
+				       (local_ack_timeout << 3));
+}
+
+/* Message REJected or MRAed */
+enum cm_msg_response {
+	CM_MSG_RESPONSE_REQ = 0x0,
+	CM_MSG_RESPONSE_REP = 0x1,
+	CM_MSG_RESPONSE_OTHER = 0x2
+};
+
+ struct cm_mra_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 local_comm_id;
+	u32 remote_comm_id;
+	/* message MRAed:2, rsvd:6 */
+	u8 offset8;
+	/* service timeout:5, rsvd:3 */
+	u8 offset9;
+
+	u8 private_data[IB_CM_MRA_PRIVATE_DATA_SIZE];
+
+} __attribute__ ((packed));
+
+static inline u8 cm_mra_get_msg_mraed(struct cm_mra_msg *mra_msg)
+{
+	return (u8) (mra_msg->offset8 >> 6);
+}
+
+static inline void cm_mra_set_msg_mraed(struct cm_mra_msg *mra_msg, u8 msg)
+{
+	mra_msg->offset8 = (u8) ((mra_msg->offset8 & 0x3F) | (msg << 6));
+}
+
+static inline u8 cm_mra_get_service_timeout(struct cm_mra_msg *mra_msg)
+{
+	return (u8) (mra_msg->offset9 >> 3);
+}
+
+static inline void cm_mra_set_service_timeout(struct cm_mra_msg *mra_msg,
+					      u8 service_timeout)
+{
+	mra_msg->offset9 = (u8) ((mra_msg->offset9 & 0x07) |
+				 (service_timeout << 3));
+}
+
+struct cm_rej_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 local_comm_id;
+	u32 remote_comm_id;
+	/* message REJected:2, rsvd:6 */
+	u8 offset8;
+	/* reject info length:7, rsvd:1. */
+	u8 offset9;
+	u16 reason;
+	u8 ari[IB_CM_REJ_ARI_LENGTH];
+
+	u8 private_data[IB_CM_REJ_PRIVATE_DATA_SIZE];
+
+} __attribute__ ((packed));
+
+static inline u8 cm_rej_get_msg_rejected(struct cm_rej_msg *rej_msg)
+{
+	return (u8) (rej_msg->offset8 >> 6);
+}
+
+static inline void cm_rej_set_msg_rejected(struct cm_rej_msg *rej_msg, u8 msg)
+{
+	rej_msg->offset8 = (u8) ((rej_msg->offset8 & 0x3F) | (msg << 6));
+}
+
+static inline u8 cm_rej_get_reject_info_len(struct cm_rej_msg *rej_msg)
+{
+	return (u8) (rej_msg->offset9 >> 1);
+}
+
+static inline void cm_rej_set_reject_info_len(struct cm_rej_msg *rej_msg,
+					      u8 len)
+{
+	rej_msg->offset9 = (u8) ((rej_msg->offset9 & 0x1) | (len << 1));
+}
+
+struct cm_rep_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 local_comm_id;
+	u32 remote_comm_id;
+	u32 local_qkey;
+	/* local QPN:24, rsvd:8 */
+	u32 offset12;
+	/* local EECN:24, rsvd:8 */
+	u32 offset16;
+	/* starting PSN:24 rsvd:8 */
+	u32 offset20;
+	u8 resp_resources;
+	u8 initiator_depth;
+	/* target ACK delay:5, failover accepted:2, end-to-end flow control:1 */
+	u8 offset26;
+	/* RNR retry count:3, SRQ:1, rsvd:5 */
+	u8 offset27;
+	u64 local_ca_guid;
+
+	u8 private_data[IB_CM_REP_PRIVATE_DATA_SIZE];
+
+} __attribute__ ((packed));
+
+static inline u32 cm_rep_get_local_qpn(struct cm_rep_msg *rep_msg)
+{
+	return cpu_to_be32(be32_to_cpu(rep_msg->offset12) >> 8);
+}
+
+static inline void cm_rep_set_local_qpn(struct cm_rep_msg *rep_msg, u32 qpn)
+{
+	rep_msg->offset12 = cpu_to_be32((be32_to_cpu(qpn) << 8) |
+			    (be32_to_cpu(rep_msg->offset12) & 0x000000FF));
+}
+
+static inline u32 cm_rep_get_starting_psn(struct cm_rep_msg *rep_msg)
+{
+	return cpu_to_be32(be32_to_cpu(rep_msg->offset20) >> 8);
+}
+
+static inline void cm_rep_set_starting_psn(struct cm_rep_msg *rep_msg,
+					   u32 starting_psn)
+{
+	rep_msg->offset20 = cpu_to_be32((be32_to_cpu(starting_psn) << 8) |
+			    (be32_to_cpu(rep_msg->offset20) & 0x000000FF));
+}
+
+static inline u8 cm_rep_get_target_ack_delay(struct cm_rep_msg *rep_msg)
+{
+	return (u8) (rep_msg->offset26 >> 3);
+}
+
+static inline void cm_rep_set_target_ack_delay(struct cm_rep_msg *rep_msg,
+					       u8 target_ack_delay)
+{
+	rep_msg->offset26 = (u8) ((rep_msg->offset26 & 0x07) |
+				  (target_ack_delay << 3));
+}
+
+static inline u8 cm_rep_get_failover(struct cm_rep_msg *rep_msg)
+{
+	return (u8) ((rep_msg->offset26 & 0x06) >> 1);
+}
+
+static inline void cm_rep_set_failover(struct cm_rep_msg *rep_msg, u8 failover)
+{
+	rep_msg->offset26 = (u8) ((rep_msg->offset26 & 0xF9) |
+				  ((failover & 0x3) << 1));
+}
+
+static inline u8 cm_rep_get_flow_ctrl(struct cm_rep_msg *rep_msg)
+{
+	return (u8) (rep_msg->offset26 & 0x01);
+}
+
+static inline void cm_rep_set_flow_ctrl(struct cm_rep_msg *rep_msg,
+					    u8 flow_ctrl)
+{
+	rep_msg->offset26 = (u8) ((rep_msg->offset26 & 0xFE) |
+				  (flow_ctrl & 0x1));
+}
+
+static inline u8 cm_rep_get_rnr_retry_count(struct cm_rep_msg *rep_msg)
+{
+	return (u8) (rep_msg->offset27 >> 5);
+}
+
+static inline void cm_rep_set_rnr_retry_count(struct cm_rep_msg *rep_msg,
+					      u8 rnr_retry_count)
+{
+	rep_msg->offset27 = (u8) ((rep_msg->offset27 & 0x1F) |
+				  (rnr_retry_count << 5));
+}
+
+static inline u8 cm_rep_get_srq(struct cm_rep_msg *rep_msg)
+{
+	return (u8) ((rep_msg->offset27 >> 4) & 0x1);
+}
+
+static inline void cm_rep_set_srq(struct cm_rep_msg *rep_msg, u8 srq)
+{
+	rep_msg->offset27 = (u8) ((rep_msg->offset27 & 0xEF) |
+				  ((srq & 0x1) << 4));
+}
+
+struct cm_rtu_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 local_comm_id;
+	u32 remote_comm_id;
+
+	u8 private_data[IB_CM_RTU_PRIVATE_DATA_SIZE];
+
+} __attribute__ ((packed));
+
+struct cm_dreq_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 local_comm_id;
+	u32 remote_comm_id;
+	/* remote QPN/EECN:24, rsvd:8 */
+	u32 offset8;
+
+	u8 private_data[IB_CM_DREQ_PRIVATE_DATA_SIZE];
+
+} __attribute__ ((packed));
+
+static inline u32 cm_dreq_get_remote_qpn(struct cm_dreq_msg *dreq_msg)
+{
+	return cpu_to_be32(be32_to_cpu(dreq_msg->offset8) >> 8);
+}
+
+static inline void cm_dreq_set_remote_qpn(struct cm_dreq_msg *dreq_msg, u32 qpn)
+{
+	dreq_msg->offset8 = cpu_to_be32((be32_to_cpu(qpn) << 8) |
+			    (be32_to_cpu(dreq_msg->offset8) & 0x000000FF));
+}
+
+struct cm_drep_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 local_comm_id;
+	u32 remote_comm_id;
+
+	u8 private_data[IB_CM_DREP_PRIVATE_DATA_SIZE];
+
+} __attribute__ ((packed));
+
+struct cm_lap_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 local_comm_id;
+	u32 remote_comm_id;
+
+	u32 rsvd8;
+	/* remote QPN/EECN:24, remote CM response timeout:5, rsvd:3 */
+	u32 offset12;
+	u32 rsvd16;
+
+	u16 alt_local_lid;
+	u16 alt_remote_lid;
+	union ib_gid alt_local_gid;
+	union ib_gid alt_remote_gid;
+	/* flow label:20, rsvd:4, traffic class:8 */
+	u32 offset56;
+	u8 alt_hop_limit;
+	/* rsvd:2, packet rate:6 */
+	uint8_t offset61;
+	/* SL:4, subnet local:1, rsvd:3 */
+	uint8_t offset62;
+	/* local ACK timeout:5, rsvd:3 */
+	uint8_t offset63;
+
+	u8 private_data[IB_CM_LAP_PRIVATE_DATA_SIZE];
+} __attribute__  ((packed));
+
+static inline u32 cm_lap_get_remote_qpn(struct cm_lap_msg *lap_msg)
+{
+	return cpu_to_be32(be32_to_cpu(lap_msg->offset12) >> 8);
+}
+
+static inline void cm_lap_set_remote_qpn(struct cm_lap_msg *lap_msg, u32 qpn)
+{
+	lap_msg->offset12 = cpu_to_be32((be32_to_cpu(qpn) << 8) |
+					 (be32_to_cpu(lap_msg->offset12) &
+					  0x000000FF));
+}
+
+static inline u8 cm_lap_get_remote_resp_timeout(struct cm_lap_msg *lap_msg)
+{
+	return (u8) ((be32_to_cpu(lap_msg->offset12) & 0xF8) >> 3);
+}
+
+static inline void cm_lap_set_remote_resp_timeout(struct cm_lap_msg *lap_msg,
+						  u8 resp_timeout)
+{
+	lap_msg->offset12 = cpu_to_be32((resp_timeout << 3) |
+					 (be32_to_cpu(lap_msg->offset12) &
+					  0xFFFFFF07));
+}
+
+static inline u32 cm_lap_get_flow_label(struct cm_lap_msg *lap_msg)
+{
+	return be32_to_cpu(lap_msg->offset56) >> 12;
+}
+
+static inline void cm_lap_set_flow_label(struct cm_lap_msg *lap_msg,
+					 u32 flow_label)
+{
+	lap_msg->offset56 = cpu_to_be32((flow_label << 12) |
+					 (be32_to_cpu(lap_msg->offset56) &
+					  0x00000FFF));
+}
+
+static inline u8 cm_lap_get_traffic_class(struct cm_lap_msg *lap_msg)
+{
+	return (u8) be32_to_cpu(lap_msg->offset56);
+}
+
+static inline void cm_lap_set_traffic_class(struct cm_lap_msg *lap_msg,
+					    u8 traffic_class)
+{
+	lap_msg->offset56 = cpu_to_be32(traffic_class |
+					 (be32_to_cpu(lap_msg->offset56) &
+					  0xFFFFFF00));
+}
+
+static inline u8 cm_lap_get_packet_rate(struct cm_lap_msg *lap_msg)
+{
+	return lap_msg->offset61 & 0x3F;
+}
+
+static inline void cm_lap_set_packet_rate(struct cm_lap_msg *lap_msg,
+					  u8 packet_rate)
+{
+	lap_msg->offset61 = (packet_rate & 0x3F) | (lap_msg->offset61 & 0xC0);
+}
+
+static inline u8 cm_lap_get_sl(struct cm_lap_msg *lap_msg)
+{
+	return lap_msg->offset62 >> 4;
+}
+
+static inline void cm_lap_set_sl(struct cm_lap_msg *lap_msg, u8 sl)
+{
+	lap_msg->offset62 = (sl << 4) | (lap_msg->offset62 & 0x0F);
+}
+
+static inline u8 cm_lap_get_subnet_local(struct cm_lap_msg *lap_msg)
+{
+	return (lap_msg->offset62 >> 3) & 0x1;
+}
+
+static inline void cm_lap_set_subnet_local(struct cm_lap_msg *lap_msg,
+					   u8 subnet_local)
+{
+	lap_msg->offset62 = ((subnet_local & 0x1) << 3) |
+			     (lap_msg->offset61 & 0xF7);
+}
+static inline u8 cm_lap_get_local_ack_timeout(struct cm_lap_msg *lap_msg)
+{
+	return lap_msg->offset63 >> 3;
+}
+
+static inline void cm_lap_set_local_ack_timeout(struct cm_lap_msg *lap_msg,
+						u8 local_ack_timeout)
+{
+	lap_msg->offset63 = (local_ack_timeout << 3) |
+			    (lap_msg->offset63 & 0x07);
+}
+
+struct cm_apr_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 local_comm_id;
+	u32 remote_comm_id;
+
+	u8 info_length;
+	u8 ap_status;
+	u8 info[IB_CM_APR_INFO_LENGTH];
+
+	u8 private_data[IB_CM_APR_PRIVATE_DATA_SIZE];
+} __attribute__ ((packed));
+
+struct cm_sidr_req_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 request_id;
+	u16 pkey;
+	u16 rsvd;
+	u64 service_id;
+
+	u8 private_data[IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE];
+} __attribute__ ((packed));
+
+struct cm_sidr_rep_msg {
+	struct ib_mad_hdr hdr;
+
+	u32 request_id;
+	u8 status;
+	u8 info_length;
+	u16 rsvd;
+	/* QPN:24, rsvd:8 */
+	u32 offset8;
+	u64 service_id;
+	u32 qkey;
+	u8 info[IB_CM_SIDR_REP_INFO_LENGTH];
+
+	u8 private_data[IB_CM_SIDR_REP_PRIVATE_DATA_SIZE];
+} __attribute__ ((packed));
+
+static inline u32 cm_sidr_rep_get_qpn(struct cm_sidr_rep_msg *sidr_rep_msg)
+{
+	return cpu_to_be32(be32_to_cpu(sidr_rep_msg->offset8) >> 8);
+}
+
+static inline void cm_sidr_rep_set_qpn(struct cm_sidr_rep_msg *sidr_rep_msg,
+				       u32 qpn)
+{
+	sidr_rep_msg->offset8 = cpu_to_be32((be32_to_cpu(qpn) << 8) |
+					(be32_to_cpu(sidr_rep_msg->offset8) &
+					 0x000000FF));
+}
+
+#endif /* CM_MSGS_H */