[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>

3 files changed, 4147 insertions, 1 deletions

diff --git a/drivers/infiniband/core/Makefile b/drivers/infiniband/core/Makefile
index 96b8eba95849..216cb281abdd 100644
--- a/drivers/infiniband/core/Makefile
+++ b/drivers/infiniband/core/Makefile
@@ -1,6 +1,7 @@
 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
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
new file mode 100644
index 000000000000..403ed125d8f4
--- /dev/null
+++ b/drivers/infiniband/core/cm.c
@@ -0,0 +1,3324 @@
+/*
+ * 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);
+
diff --git a/drivers/infiniband/core/cm_msgs.h b/drivers/infiniband/core/cm_msgs.h
new file mode 100644
index 000000000000..15a309a77b2b
--- /dev/null
+++ b/drivers/infiniband/core/cm_msgs.h
@@ -0,0 +1,819 @@
+/*
+ * 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 */