cm.c 92.1 KB
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/*
 * 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>

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#include <rdma/ib_cache.h>
#include <rdma/ib_cm.h>
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#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;
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	__be64 ca_guid;
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	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 */
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	__be32 local_id;			/* Established / timewait */
	__be32 remote_id;
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	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;
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	__be64 remote_ca_guid;
	__be32 remote_qpn;
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	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;
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	__be64 tid;
	__be32 local_qpn;
	__be32 remote_qpn;
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	enum ib_qp_type qp_type;
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	__be32 sq_psn;
	__be32 rq_psn;
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	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);

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	m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 
			       cm_id_priv->av.pkey_index,
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			       0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
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			       GFP_ATOMIC);
	if (IS_ERR(m)) {
		ib_destroy_ah(ah);
		return PTR_ERR(m);
	}

	/* Timeout set by caller if response is expected. */
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	m->ah = ah;
	m->retries = cm_id_priv->max_cm_retries;
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	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,
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			       0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
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			       GFP_ATOMIC);
	if (IS_ERR(m)) {
		ib_destroy_ah(ah);
		return PTR_ERR(m);
	}
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	m->ah = ah;
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	*msg = m;
	return 0;
}

static void cm_free_msg(struct ib_mad_send_buf *msg)
{
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	ib_destroy_ah(msg->ah);
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	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);
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	ah_attr->dlid = dlid;
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	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;
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	cm_set_ah_attr(&av->ah_attr, port->port_num, wc->slid,
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		       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;
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	cm_set_ah_attr(&av->ah_attr, av->port->port_num,
		       be16_to_cpu(path->dlid), path->sl,
		       be16_to_cpu(path->slid) & 0x7F);
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	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;
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	static int next_id;
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	do {
		spin_lock_irqsave(&cm.lock, flags);
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		ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, next_id++,
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					(__force int *) &cm_id_priv->id.local_id);
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		spin_unlock_irqrestore(&cm.lock, flags);
	} while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
	return ret;
}

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static void cm_free_id(__be32 local_id)
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{
	unsigned long flags;

	spin_lock_irqsave(&cm.lock, flags);
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	idr_remove(&cm.local_id_table, (__force int) local_id);
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	spin_unlock_irqrestore(&cm.lock, flags);
}

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static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
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{
	struct cm_id_private *cm_id_priv;

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	cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id);
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	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;
}

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static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
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{
	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;
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	__be64 service_id = cm_id_priv->id.service_id;
	__be64 service_mask = cm_id_priv->id.service_mask;
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	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) ==
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		    (service_mask & cur_cm_id_priv->id.service_id) &&
		    (cm_id_priv->id.device == cur_cm_id_priv->id.device))
			return cur_cm_id_priv;

		if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
			link = &(*link)->rb_left;
		else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
			link = &(*link)->rb_right;
		else if (service_id < cur_cm_id_priv->id.service_id)
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			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;
}

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static struct cm_id_private * cm_find_listen(struct ib_device *device,
					     __be64 service_id)
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{
	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) ==
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		     cm_id_priv->id.service_id &&
		    (cm_id_priv->id.device == device))
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			return cm_id_priv;
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		if (device < cm_id_priv->id.device)
			node = node->rb_left;
		else if (device > cm_id_priv->id.device)
			node = node->rb_right;
		else if (service_id < cm_id_priv->id.service_id)
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			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;
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	__be64 remote_ca_guid = timewait_info->remote_ca_guid;
	__be32 remote_id = timewait_info->work.remote_id;
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	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;
}

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static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
						   __be32 remote_id)
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{
	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;
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	__be64 remote_ca_guid = timewait_info->remote_ca_guid;
	__be32 remote_qpn = timewait_info->remote_qpn;
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	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;
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	__be32 remote_id = cm_id_priv->id.remote_id;
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	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);
}

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struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
				 ib_cm_handler cm_handler,
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				 void *context)
{
	struct cm_id_private *cm_id_priv;
	int ret;

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	cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
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	if (!cm_id_priv)
		return ERR_PTR(-ENOMEM);

	cm_id_priv->id.state = IB_CM_IDLE;
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	cm_id_priv->id.device = device;
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	cm_id_priv->id.cm_handler = cm_handler;
	cm_id_priv->id.context = context;
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	cm_id_priv->id.remote_cm_qpn = 1;
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	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);
}

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static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
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{
	struct cm_timewait_info *timewait_info;

Roland Dreier's avatar
Roland Dreier committed
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	timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
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	if (!timewait_info)
		return ERR_PTR(-ENOMEM);

	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;
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		ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
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		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:
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		ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
		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;
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	case IB_CM_MRA_REQ_RCVD:
	case IB_CM_REP_SENT:
	case IB_CM_MRA_REP_RCVD:
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		ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
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		/* 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);
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		ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
			       NULL, 0, NULL, 0);
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		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:
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		ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
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		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,
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		 __be64 service_id,
		 __be64 service_mask)
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{
	struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
	unsigned long flags;
	int ret = 0;

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	service_mask = service_mask ? service_mask :
		       __constant_cpu_to_be64(~0ULL);
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	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) {
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		cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
		cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
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	} 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);

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static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
			  enum cm_msg_sequence msg_seq)
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{
	u64 hi_tid, low_tid;

	hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
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	low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
			  (msg_seq << 30));
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	return cpu_to_be64(hi_tid | low_tid);
}

static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
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			      __be16 attr_id, __be64 tid)
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{
	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);
}

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static int cm_validate_req_param(struct ib_cm_req_param *param)
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{
	/* 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 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;
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	cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
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	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;
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	cm_id_priv->qp_type = param->qp_type;
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	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;
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	cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
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	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);
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	ret = ib_post_send_mad(cm_id_priv->msg, NULL);
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	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 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);
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	rej_msg->reason = cpu_to_be16(reason);
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	if (ari && ari_length) {
		cm_rej_set_reject_info_len(rej_msg, ari_length);
		memcpy(rej_msg->ari, ari, ari_length);
	}

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	ret = ib_post_send_mad(msg, NULL);
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	if (ret)
		cm_free_msg(msg);

	return ret;
}

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static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
				    __be32 local_qpn, __be32 remote_qpn)
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{
	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))));
}

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static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
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					    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->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;
	}

1159
	rej_msg->reason = cpu_to_be16(reason);
1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
	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;
	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);

1201
	ret = ib_post_send_mad(msg, NULL);
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
	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. */
1241 1242
	listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
					   req_msg->service_id);
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269
	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;

1270
	cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
	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;
1297
	cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320

	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);
1321
	cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331

	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);
1332
	cm_id_priv->timewait_info = NULL;
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386
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;
	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);
1387
	msg->timeout_ms = cm_id_priv->timeout_ms;
1388 1389
	msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;

1390
	ret = ib_post_send_mad(msg, NULL);
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453
	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;
	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);

1454
	ret = ib_post_send_mad(msg, NULL);
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
	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;
	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);

1526
	ret = ib_post_send_mad(msg, NULL);
1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593
	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 */

1594
	ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627
	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;
	}

1628
	ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666
	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;

1667
	ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
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	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;
	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);
1725
	msg->timeout_ms = cm_id_priv->timeout_ms;
1726 1727
	msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;

1728
	ret = ib_post_send_mad(msg, NULL);
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	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;
	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);

1791
	ret = ib_post_send_mad(msg, NULL);