drivers/infiniband/core/cma.c

/*
 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
 * Copyright (c) 2005-2006 Intel 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 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.
 */

#include <linux/completion.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/idr.h>
#include <linux/inetdevice.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <net/route.h>

#include <net/tcp.h>
#include <net/ipv6.h>

#include <rdma/rdma_cm.h>
#include <rdma/rdma_cm_ib.h>
#include <rdma/rdma_netlink.h>
#include <rdma/ib.h>
#include <rdma/ib_cache.h>
#include <rdma/ib_cm.h>
#include <rdma/ib_sa.h>
#include <rdma/iw_cm.h>

MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("Generic RDMA CM Agent");
MODULE_LICENSE("Dual BSD/GPL");

#define CMA_CM_RESPONSE_TIMEOUT 20
#define CMA_MAX_CM_RETRIES 15
#define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
#define CMA_IBOE_PACKET_LIFETIME 18

static const char * const cma_events[] = {
	[RDMA_CM_EVENT_ADDR_RESOLVED]	 = "address resolved",
	[RDMA_CM_EVENT_ADDR_ERROR]	 = "address error",
	[RDMA_CM_EVENT_ROUTE_RESOLVED]	 = "route resolved ",
	[RDMA_CM_EVENT_ROUTE_ERROR]	 = "route error",
	[RDMA_CM_EVENT_CONNECT_REQUEST]	 = "connect request",
	[RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
	[RDMA_CM_EVENT_CONNECT_ERROR]	 = "connect error",
	[RDMA_CM_EVENT_UNREACHABLE]	 = "unreachable",
	[RDMA_CM_EVENT_REJECTED]	 = "rejected",
	[RDMA_CM_EVENT_ESTABLISHED]	 = "established",
	[RDMA_CM_EVENT_DISCONNECTED]	 = "disconnected",
	[RDMA_CM_EVENT_DEVICE_REMOVAL]	 = "device removal",
	[RDMA_CM_EVENT_MULTICAST_JOIN]	 = "multicast join",
	[RDMA_CM_EVENT_MULTICAST_ERROR]	 = "multicast error",
	[RDMA_CM_EVENT_ADDR_CHANGE]	 = "address change",
	[RDMA_CM_EVENT_TIMEWAIT_EXIT]	 = "timewait exit",
};

const char *rdma_event_msg(enum rdma_cm_event_type event)
{
	size_t index = event;

	return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
			cma_events[index] : "unrecognized event";
}
EXPORT_SYMBOL(rdma_event_msg);

static void cma_add_one(struct ib_device *device);
static void cma_remove_one(struct ib_device *device);

static struct ib_client cma_client = {
	.name   = "cma",
	.add    = cma_add_one,
	.remove = cma_remove_one
};

static struct ib_sa_client sa_client;
static struct rdma_addr_client addr_client;
static LIST_HEAD(dev_list);
static LIST_HEAD(listen_any_list);
static DEFINE_MUTEX(lock);
static struct workqueue_struct *cma_wq;
static DEFINE_IDR(tcp_ps);
static DEFINE_IDR(udp_ps);
static DEFINE_IDR(ipoib_ps);
static DEFINE_IDR(ib_ps);

struct cma_device {
	struct list_head	list;
	struct ib_device	*device;
	struct completion	comp;
	atomic_t		refcount;
	struct list_head	id_list;
};

struct rdma_bind_list {
	struct idr		*ps;
	struct hlist_head	owners;
	unsigned short		port;
};

enum {
	CMA_OPTION_AFONLY,
};

/*
 * Device removal can occur at anytime, so we need extra handling to
 * serialize notifying the user of device removal with other callbacks.
 * We do this by disabling removal notification while a callback is in process,
 * and reporting it after the callback completes.
 */
struct rdma_id_private {
	struct rdma_cm_id	id;

	struct rdma_bind_list	*bind_list;
	struct hlist_node	node;
	struct list_head	list; /* listen_any_list or cma_device.list */
	struct list_head	listen_list; /* per device listens */
	struct cma_device	*cma_dev;
	struct list_head	mc_list;

	int			internal_id;
	enum rdma_cm_state	state;
	spinlock_t		lock;
	struct mutex		qp_mutex;

	struct completion	comp;
	atomic_t		refcount;
	struct mutex		handler_mutex;

	int			backlog;
	int			timeout_ms;
	struct ib_sa_query	*query;
	int			query_id;
	union {
		struct ib_cm_id	*ib;
		struct iw_cm_id	*iw;
	} cm_id;

	u32			seq_num;
	u32			qkey;
	u32			qp_num;
	pid_t			owner;
	u32			options;
	u8			srq;
	u8			tos;
	u8			reuseaddr;
	u8			afonly;
};

struct cma_multicast {
	struct rdma_id_private *id_priv;
	union {
		struct ib_sa_multicast *ib;
	} multicast;
	struct list_head	list;
	void			*context;
	struct sockaddr_storage	addr;
	struct kref		mcref;
};

struct cma_work {
	struct work_struct	work;
	struct rdma_id_private	*id;
	enum rdma_cm_state	old_state;
	enum rdma_cm_state	new_state;
	struct rdma_cm_event	event;
};

struct cma_ndev_work {
	struct work_struct	work;
	struct rdma_id_private	*id;
	struct rdma_cm_event	event;
};

struct iboe_mcast_work {
	struct work_struct	 work;
	struct rdma_id_private	*id;
	struct cma_multicast	*mc;
};

union cma_ip_addr {
	struct in6_addr ip6;
	struct {
		__be32 pad[3];
		__be32 addr;
	} ip4;
};

struct cma_hdr {
	u8 cma_version;
	u8 ip_version;	/* IP version: 7:4 */
	__be16 port;
	union cma_ip_addr src_addr;
	union cma_ip_addr dst_addr;
};

#define CMA_VERSION 0x00

static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&id_priv->lock, flags);
	ret = (id_priv->state == comp);
	spin_unlock_irqrestore(&id_priv->lock, flags);
	return ret;
}

static int cma_comp_exch(struct rdma_id_private *id_priv,
			 enum rdma_cm_state comp, enum rdma_cm_state exch)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&id_priv->lock, flags);
	if ((ret = (id_priv->state == comp)))
		id_priv->state = exch;
	spin_unlock_irqrestore(&id_priv->lock, flags);
	return ret;
}

static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
				   enum rdma_cm_state exch)
{
	unsigned long flags;
	enum rdma_cm_state old;

	spin_lock_irqsave(&id_priv->lock, flags);
	old = id_priv->state;
	id_priv->state = exch;
	spin_unlock_irqrestore(&id_priv->lock, flags);
	return old;
}

static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
{
	return hdr->ip_version >> 4;
}

static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
{
	hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
}

static void cma_attach_to_dev(struct rdma_id_private *id_priv,
			      struct cma_device *cma_dev)
{
	atomic_inc(&cma_dev->refcount);
	id_priv->cma_dev = cma_dev;
	id_priv->id.device = cma_dev->device;
	id_priv->id.route.addr.dev_addr.transport =
		rdma_node_get_transport(cma_dev->device->node_type);
	list_add_tail(&id_priv->list, &cma_dev->id_list);
}

static inline void cma_deref_dev(struct cma_device *cma_dev)
{
	if (atomic_dec_and_test(&cma_dev->refcount))
		complete(&cma_dev->comp);
}

static inline void release_mc(struct kref *kref)
{
	struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);

	kfree(mc->multicast.ib);
	kfree(mc);
}

static void cma_release_dev(struct rdma_id_private *id_priv)
{
	mutex_lock(&lock);
	list_del(&id_priv->list);
	cma_deref_dev(id_priv->cma_dev);
	id_priv->cma_dev = NULL;
	mutex_unlock(&lock);
}

static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
{
	return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
}

static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
{
	return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
}

static inline unsigned short cma_family(struct rdma_id_private *id_priv)
{
	return id_priv->id.route.addr.src_addr.ss_family;
}

static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
{
	struct ib_sa_mcmember_rec rec;
	int ret = 0;

	if (id_priv->qkey) {
		if (qkey && id_priv->qkey != qkey)
			return -EINVAL;
		return 0;
	}

	if (qkey) {
		id_priv->qkey = qkey;
		return 0;
	}

	switch (id_priv->id.ps) {
	case RDMA_PS_UDP:
	case RDMA_PS_IB:
		id_priv->qkey = RDMA_UDP_QKEY;
		break;
	case RDMA_PS_IPOIB:
		ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
		ret = ib_sa_get_mcmember_rec(id_priv->id.device,
					     id_priv->id.port_num, &rec.mgid,
					     &rec);
		if (!ret)
			id_priv->qkey = be32_to_cpu(rec.qkey);
		break;
	default:
		break;
	}
	return ret;
}

static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
{
	dev_addr->dev_type = ARPHRD_INFINIBAND;
	rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
	ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
}

static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
{
	int ret;

	if (addr->sa_family != AF_IB) {
		ret = rdma_translate_ip(addr, dev_addr, NULL);
	} else {
		cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
		ret = 0;
	}

	return ret;
}

static inline int cma_validate_port(struct ib_device *device, u8 port,
				      union ib_gid *gid, int dev_type)
{
	u8 found_port;
	int ret = -ENODEV;

	if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
		return ret;

	if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
		return ret;

	ret = ib_find_cached_gid(device, gid, &found_port, NULL);
	if (port != found_port)
		return -ENODEV;

	return ret;
}

static int cma_acquire_dev(struct rdma_id_private *id_priv,
			   struct rdma_id_private *listen_id_priv)
{
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	struct cma_device *cma_dev;
	union ib_gid gid, iboe_gid, *gidp;
	int ret = -ENODEV;
	u8 port;

	if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
	    id_priv->id.ps == RDMA_PS_IPOIB)
		return -EINVAL;

	mutex_lock(&lock);
	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
		    &iboe_gid);

	memcpy(&gid, dev_addr->src_dev_addr +
	       rdma_addr_gid_offset(dev_addr), sizeof gid);

	if (listen_id_priv) {
		cma_dev = listen_id_priv->cma_dev;
		port = listen_id_priv->id.port_num;
		gidp = rdma_protocol_roce(cma_dev->device, port) ?
		       &iboe_gid : &gid;

		ret = cma_validate_port(cma_dev->device, port, gidp,
					dev_addr->dev_type);
		if (!ret) {
			id_priv->id.port_num = port;
			goto out;
		}
	}

	list_for_each_entry(cma_dev, &dev_list, list) {
		for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
			if (listen_id_priv &&
			    listen_id_priv->cma_dev == cma_dev &&
			    listen_id_priv->id.port_num == port)
				continue;

			gidp = rdma_protocol_roce(cma_dev->device, port) ?
			       &iboe_gid : &gid;

			ret = cma_validate_port(cma_dev->device, port, gidp,
						dev_addr->dev_type);
			if (!ret) {
				id_priv->id.port_num = port;
				goto out;
			}
		}
	}

out:
	if (!ret)
		cma_attach_to_dev(id_priv, cma_dev);

	mutex_unlock(&lock);
	return ret;
}

/*
 * Select the source IB device and address to reach the destination IB address.
 */
static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
{
	struct cma_device *cma_dev, *cur_dev;
	struct sockaddr_ib *addr;
	union ib_gid gid, sgid, *dgid;
	u16 pkey, index;
	u8 p;
	int i;

	cma_dev = NULL;
	addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
	dgid = (union ib_gid *) &addr->sib_addr;
	pkey = ntohs(addr->sib_pkey);

	list_for_each_entry(cur_dev, &dev_list, list) {
		for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
			if (!rdma_cap_af_ib(cur_dev->device, p))
				continue;

			if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
				continue;

			for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i, &gid); i++) {
				if (!memcmp(&gid, dgid, sizeof(gid))) {
					cma_dev = cur_dev;
					sgid = gid;
					id_priv->id.port_num = p;
					goto found;
				}

				if (!cma_dev && (gid.global.subnet_prefix ==
						 dgid->global.subnet_prefix)) {
					cma_dev = cur_dev;
					sgid = gid;
					id_priv->id.port_num = p;
				}
			}
		}
	}

	if (!cma_dev)
		return -ENODEV;

found:
	cma_attach_to_dev(id_priv, cma_dev);
	addr = (struct sockaddr_ib *) cma_src_addr(id_priv);
	memcpy(&addr->sib_addr, &sgid, sizeof sgid);
	cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
	return 0;
}

static void cma_deref_id(struct rdma_id_private *id_priv)
{
	if (atomic_dec_and_test(&id_priv->refcount))
		complete(&id_priv->comp);
}

static int cma_disable_callback(struct rdma_id_private *id_priv,
				enum rdma_cm_state state)
{
	mutex_lock(&id_priv->handler_mutex);
	if (id_priv->state != state) {
		mutex_unlock(&id_priv->handler_mutex);
		return -EINVAL;
	}
	return 0;
}

struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
				  void *context, enum rdma_port_space ps,
				  enum ib_qp_type qp_type)
{
	struct rdma_id_private *id_priv;

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

	id_priv->owner = task_pid_nr(current);
	id_priv->state = RDMA_CM_IDLE;
	id_priv->id.context = context;
	id_priv->id.event_handler = event_handler;
	id_priv->id.ps = ps;
	id_priv->id.qp_type = qp_type;
	spin_lock_init(&id_priv->lock);
	mutex_init(&id_priv->qp_mutex);
	init_completion(&id_priv->comp);
	atomic_set(&id_priv->refcount, 1);
	mutex_init(&id_priv->handler_mutex);
	INIT_LIST_HEAD(&id_priv->listen_list);
	INIT_LIST_HEAD(&id_priv->mc_list);
	get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);

	return &id_priv->id;
}
EXPORT_SYMBOL(rdma_create_id);

static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
{
	struct ib_qp_attr qp_attr;
	int qp_attr_mask, ret;

	qp_attr.qp_state = IB_QPS_INIT;
	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
	if (ret)
		return ret;

	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
	if (ret)
		return ret;

	qp_attr.qp_state = IB_QPS_RTR;
	ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
	if (ret)
		return ret;

	qp_attr.qp_state = IB_QPS_RTS;
	qp_attr.sq_psn = 0;
	ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);

	return ret;
}

static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
{
	struct ib_qp_attr qp_attr;
	int qp_attr_mask, ret;

	qp_attr.qp_state = IB_QPS_INIT;
	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
	if (ret)
		return ret;

	return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
}

int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
		   struct ib_qp_init_attr *qp_init_attr)
{
	struct rdma_id_private *id_priv;
	struct ib_qp *qp;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (id->device != pd->device)
		return -EINVAL;

	qp = ib_create_qp(pd, qp_init_attr);
	if (IS_ERR(qp))
		return PTR_ERR(qp);

	if (id->qp_type == IB_QPT_UD)
		ret = cma_init_ud_qp(id_priv, qp);
	else
		ret = cma_init_conn_qp(id_priv, qp);
	if (ret)
		goto err;

	id->qp = qp;
	id_priv->qp_num = qp->qp_num;
	id_priv->srq = (qp->srq != NULL);
	return 0;
err:
	ib_destroy_qp(qp);
	return ret;
}
EXPORT_SYMBOL(rdma_create_qp);

void rdma_destroy_qp(struct rdma_cm_id *id)
{
	struct rdma_id_private *id_priv;

	id_priv = container_of(id, struct rdma_id_private, id);
	mutex_lock(&id_priv->qp_mutex);
	ib_destroy_qp(id_priv->id.qp);
	id_priv->id.qp = NULL;
	mutex_unlock(&id_priv->qp_mutex);
}
EXPORT_SYMBOL(rdma_destroy_qp);

static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
			     struct rdma_conn_param *conn_param)
{
	struct ib_qp_attr qp_attr;
	int qp_attr_mask, ret;
	union ib_gid sgid;

	mutex_lock(&id_priv->qp_mutex);
	if (!id_priv->id.qp) {
		ret = 0;
		goto out;
	}

	/* Need to update QP attributes from default values. */
	qp_attr.qp_state = IB_QPS_INIT;
	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
	if (ret)
		goto out;

	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
	if (ret)
		goto out;

	qp_attr.qp_state = IB_QPS_RTR;
	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
	if (ret)
		goto out;

	ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
			   qp_attr.ah_attr.grh.sgid_index, &sgid);
	if (ret)
		goto out;

	BUG_ON(id_priv->cma_dev->device != id_priv->id.device);

	if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
		ret = rdma_addr_find_smac_by_sgid(&sgid, qp_attr.smac, NULL);

		if (ret)
			goto out;
	}
	if (conn_param)
		qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
out:
	mutex_unlock(&id_priv->qp_mutex);
	return ret;
}

static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
			     struct rdma_conn_param *conn_param)
{
	struct ib_qp_attr qp_attr;
	int qp_attr_mask, ret;

	mutex_lock(&id_priv->qp_mutex);
	if (!id_priv->id.qp) {
		ret = 0;
		goto out;
	}

	qp_attr.qp_state = IB_QPS_RTS;
	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
	if (ret)
		goto out;

	if (conn_param)
		qp_attr.max_rd_atomic = conn_param->initiator_depth;
	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
out:
	mutex_unlock(&id_priv->qp_mutex);
	return ret;
}

static int cma_modify_qp_err(struct rdma_id_private *id_priv)
{
	struct ib_qp_attr qp_attr;
	int ret;

	mutex_lock(&id_priv->qp_mutex);
	if (!id_priv->id.qp) {
		ret = 0;
		goto out;
	}

	qp_attr.qp_state = IB_QPS_ERR;
	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
out:
	mutex_unlock(&id_priv->qp_mutex);
	return ret;
}

static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
			       struct ib_qp_attr *qp_attr, int *qp_attr_mask)
{
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	int ret;
	u16 pkey;

	if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
		pkey = 0xffff;
	else
		pkey = ib_addr_get_pkey(dev_addr);

	ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
				  pkey, &qp_attr->pkey_index);
	if (ret)
		return ret;

	qp_attr->port_num = id_priv->id.port_num;
	*qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;

	if (id_priv->id.qp_type == IB_QPT_UD) {
		ret = cma_set_qkey(id_priv, 0);
		if (ret)
			return ret;

		qp_attr->qkey = id_priv->qkey;
		*qp_attr_mask |= IB_QP_QKEY;
	} else {
		qp_attr->qp_access_flags = 0;
		*qp_attr_mask |= IB_QP_ACCESS_FLAGS;
	}
	return 0;
}

int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
		       int *qp_attr_mask)
{
	struct rdma_id_private *id_priv;
	int ret = 0;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (rdma_cap_ib_cm(id->device, id->port_num)) {
		if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
			ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
		else
			ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
						 qp_attr_mask);

		if (qp_attr->qp_state == IB_QPS_RTR)
			qp_attr->rq_psn = id_priv->seq_num;
	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
		if (!id_priv->cm_id.iw) {
			qp_attr->qp_access_flags = 0;
			*qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
		} else
			ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
						 qp_attr_mask);
	} else
		ret = -ENOSYS;

	return ret;
}
EXPORT_SYMBOL(rdma_init_qp_attr);

static inline int cma_zero_addr(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET:
		return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
	case AF_INET6:
		return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
	case AF_IB:
		return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
	default:
		return 0;
	}
}

static inline int cma_loopback_addr(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET:
		return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
	case AF_INET6:
		return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
	case AF_IB:
		return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
	default:
		return 0;
	}
}

static inline int cma_any_addr(struct sockaddr *addr)
{
	return cma_zero_addr(addr) || cma_loopback_addr(addr);
}

static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
{
	if (src->sa_family != dst->sa_family)
		return -1;

	switch (src->sa_family) {
	case AF_INET:
		return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
		       ((struct sockaddr_in *) dst)->sin_addr.s_addr;
	case AF_INET6:
		return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
				     &((struct sockaddr_in6 *) dst)->sin6_addr);
	default:
		return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
				   &((struct sockaddr_ib *) dst)->sib_addr);
	}
}

static __be16 cma_port(struct sockaddr *addr)
{
	struct sockaddr_ib *sib;

	switch (addr->sa_family) {
	case AF_INET:
		return ((struct sockaddr_in *) addr)->sin_port;
	case AF_INET6:
		return ((struct sockaddr_in6 *) addr)->sin6_port;
	case AF_IB:
		sib = (struct sockaddr_ib *) addr;
		return htons((u16) (be64_to_cpu(sib->sib_sid) &
				    be64_to_cpu(sib->sib_sid_mask)));
	default:
		return 0;
	}
}

static inline int cma_any_port(struct sockaddr *addr)
{
	return !cma_port(addr);
}

static void cma_save_ib_info(struct rdma_cm_id *id, struct rdma_cm_id *listen_id,
			     struct ib_sa_path_rec *path)
{
	struct sockaddr_ib *listen_ib, *ib;

	listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
	ib = (struct sockaddr_ib *) &id->route.addr.src_addr;
	ib->sib_family = listen_ib->sib_family;
	if (path) {
		ib->sib_pkey = path->pkey;
		ib->sib_flowinfo = path->flow_label;
		memcpy(&ib->sib_addr, &path->sgid, 16);
	} else {
		ib->sib_pkey = listen_ib->sib_pkey;
		ib->sib_flowinfo = listen_ib->sib_flowinfo;
		ib->sib_addr = listen_ib->sib_addr;
	}
	ib->sib_sid = listen_ib->sib_sid;
	ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
	ib->sib_scope_id = listen_ib->sib_scope_id;

	if (path) {
		ib = (struct sockaddr_ib *) &id->route.addr.dst_addr;
		ib->sib_family = listen_ib->sib_family;
		ib->sib_pkey = path->pkey;
		ib->sib_flowinfo = path->flow_label;
		memcpy(&ib->sib_addr, &path->dgid, 16);
	}
}

static __be16 ss_get_port(const struct sockaddr_storage *ss)
{
	if (ss->ss_family == AF_INET)
		return ((struct sockaddr_in *)ss)->sin_port;
	else if (ss->ss_family == AF_INET6)
		return ((struct sockaddr_in6 *)ss)->sin6_port;
	BUG();
}

static void cma_save_ip4_info(struct rdma_cm_id *id, struct rdma_cm_id *listen_id,
			      struct cma_hdr *hdr)
{
	struct sockaddr_in *ip4;

	ip4 = (struct sockaddr_in *) &id->route.addr.src_addr;
	ip4->sin_family = AF_INET;
	ip4->sin_addr.s_addr = hdr->dst_addr.ip4.addr;
	ip4->sin_port = ss_get_port(&listen_id->route.addr.src_addr);

	ip4 = (struct sockaddr_in *) &id->route.addr.dst_addr;
	ip4->sin_family = AF_INET;
	ip4->sin_addr.s_addr = hdr->src_addr.ip4.addr;
	ip4->sin_port = hdr->port;
}

static void cma_save_ip6_info(struct rdma_cm_id *id, struct rdma_cm_id *listen_id,
			      struct cma_hdr *hdr)
{
	struct sockaddr_in6 *ip6;

	ip6 = (struct sockaddr_in6 *) &id->route.addr.src_addr;
	ip6->sin6_family = AF_INET6;
	ip6->sin6_addr = hdr->dst_addr.ip6;
	ip6->sin6_port = ss_get_port(&listen_id->route.addr.src_addr);

	ip6 = (struct sockaddr_in6 *) &id->route.addr.dst_addr;
	ip6->sin6_family = AF_INET6;
	ip6->sin6_addr = hdr->src_addr.ip6;
	ip6->sin6_port = hdr->port;
}

static int cma_save_net_info(struct rdma_cm_id *id, struct rdma_cm_id *listen_id,
			     struct ib_cm_event *ib_event)
{
	struct cma_hdr *hdr;

	if (listen_id->route.addr.src_addr.ss_family == AF_IB) {
		if (ib_event->event == IB_CM_REQ_RECEIVED)
			cma_save_ib_info(id, listen_id, ib_event->param.req_rcvd.primary_path);
		else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
			cma_save_ib_info(id, listen_id, NULL);
		return 0;
	}

	hdr = ib_event->private_data;
	if (hdr->cma_version != CMA_VERSION)
		return -EINVAL;

	switch (cma_get_ip_ver(hdr)) {
	case 4:
		cma_save_ip4_info(id, listen_id, hdr);
		break;
	case 6:
		cma_save_ip6_info(id, listen_id, hdr);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static inline int cma_user_data_offset(struct rdma_id_private *id_priv)
{
	return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
}

static void cma_cancel_route(struct rdma_id_private *id_priv)
{
	if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
		if (id_priv->query)
			ib_sa_cancel_query(id_priv->query_id, id_priv->query);
	}
}

static void cma_cancel_listens(struct rdma_id_private *id_priv)
{
	struct rdma_id_private *dev_id_priv;

	/*
	 * Remove from listen_any_list to prevent added devices from spawning
	 * additional listen requests.
	 */
	mutex_lock(&lock);
	list_del(&id_priv->list);

	while (!list_empty(&id_priv->listen_list)) {
		dev_id_priv = list_entry(id_priv->listen_list.next,
					 struct rdma_id_private, listen_list);
		/* sync with device removal to avoid duplicate destruction */
		list_del_init(&dev_id_priv->list);
		list_del(&dev_id_priv->listen_list);
		mutex_unlock(&lock);

		rdma_destroy_id(&dev_id_priv->id);
		mutex_lock(&lock);
	}
	mutex_unlock(&lock);
}

static void cma_cancel_operation(struct rdma_id_private *id_priv,
				 enum rdma_cm_state state)
{
	switch (state) {
	case RDMA_CM_ADDR_QUERY:
		rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
		break;
	case RDMA_CM_ROUTE_QUERY:
		cma_cancel_route(id_priv);
		break;
	case RDMA_CM_LISTEN:
		if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
			cma_cancel_listens(id_priv);
		break;
	default:
		break;
	}
}

static void cma_release_port(struct rdma_id_private *id_priv)
{
	struct rdma_bind_list *bind_list = id_priv->bind_list;

	if (!bind_list)
		return;

	mutex_lock(&lock);
	hlist_del(&id_priv->node);
	if (hlist_empty(&bind_list->owners)) {
		idr_remove(bind_list->ps, bind_list->port);
		kfree(bind_list);
	}
	mutex_unlock(&lock);
}

static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
{
	struct cma_multicast *mc;

	while (!list_empty(&id_priv->mc_list)) {
		mc = container_of(id_priv->mc_list.next,
				  struct cma_multicast, list);
		list_del(&mc->list);
		if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
				      id_priv->id.port_num)) {
			ib_sa_free_multicast(mc->multicast.ib);
			kfree(mc);
		} else
			kref_put(&mc->mcref, release_mc);
	}
}

void rdma_destroy_id(struct rdma_cm_id *id)
{
	struct rdma_id_private *id_priv;
	enum rdma_cm_state state;

	id_priv = container_of(id, struct rdma_id_private, id);
	state = cma_exch(id_priv, RDMA_CM_DESTROYING);
	cma_cancel_operation(id_priv, state);

	/*
	 * Wait for any active callback to finish.  New callbacks will find
	 * the id_priv state set to destroying and abort.
	 */
	mutex_lock(&id_priv->handler_mutex);
	mutex_unlock(&id_priv->handler_mutex);

	if (id_priv->cma_dev) {
		if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
			if (id_priv->cm_id.ib)
				ib_destroy_cm_id(id_priv->cm_id.ib);
		} else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
			if (id_priv->cm_id.iw)
				iw_destroy_cm_id(id_priv->cm_id.iw);
		}
		cma_leave_mc_groups(id_priv);
		cma_release_dev(id_priv);
	}

	cma_release_port(id_priv);
	cma_deref_id(id_priv);
	wait_for_completion(&id_priv->comp);

	if (id_priv->internal_id)
		cma_deref_id(id_priv->id.context);

	kfree(id_priv->id.route.path_rec);
	kfree(id_priv);
}
EXPORT_SYMBOL(rdma_destroy_id);

static int cma_rep_recv(struct rdma_id_private *id_priv)
{
	int ret;

	ret = cma_modify_qp_rtr(id_priv, NULL);
	if (ret)
		goto reject;

	ret = cma_modify_qp_rts(id_priv, NULL);
	if (ret)
		goto reject;

	ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
	if (ret)
		goto reject;

	return 0;
reject:
	cma_modify_qp_err(id_priv);
	ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
		       NULL, 0, NULL, 0);
	return ret;
}

static void cma_set_rep_event_data(struct rdma_cm_event *event,
				   struct ib_cm_rep_event_param *rep_data,
				   void *private_data)
{
	event->param.conn.private_data = private_data;
	event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
	event->param.conn.responder_resources = rep_data->responder_resources;
	event->param.conn.initiator_depth = rep_data->initiator_depth;
	event->param.conn.flow_control = rep_data->flow_control;
	event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
	event->param.conn.srq = rep_data->srq;
	event->param.conn.qp_num = rep_data->remote_qpn;
}

static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
{
	struct rdma_id_private *id_priv = cm_id->context;
	struct rdma_cm_event event;
	int ret = 0;

	if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
		cma_disable_callback(id_priv, RDMA_CM_CONNECT)) ||
	    (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
		cma_disable_callback(id_priv, RDMA_CM_DISCONNECT)))
		return 0;

	memset(&event, 0, sizeof event);
	switch (ib_event->event) {
	case IB_CM_REQ_ERROR:
	case IB_CM_REP_ERROR:
		event.event = RDMA_CM_EVENT_UNREACHABLE;
		event.status = -ETIMEDOUT;
		break;
	case IB_CM_REP_RECEIVED:
		if (id_priv->id.qp) {
			event.status = cma_rep_recv(id_priv);
			event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
						     RDMA_CM_EVENT_ESTABLISHED;
		} else {
			event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
		}
		cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
				       ib_event->private_data);
		break;
	case IB_CM_RTU_RECEIVED:
	case IB_CM_USER_ESTABLISHED:
		event.event = RDMA_CM_EVENT_ESTABLISHED;
		break;
	case IB_CM_DREQ_ERROR:
		event.status = -ETIMEDOUT; /* fall through */
	case IB_CM_DREQ_RECEIVED:
	case IB_CM_DREP_RECEIVED:
		if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
				   RDMA_CM_DISCONNECT))
			goto out;
		event.event = RDMA_CM_EVENT_DISCONNECTED;
		break;
	case IB_CM_TIMEWAIT_EXIT:
		event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
		break;
	case IB_CM_MRA_RECEIVED:
		/* ignore event */
		goto out;
	case IB_CM_REJ_RECEIVED:
		cma_modify_qp_err(id_priv);
		event.status = ib_event->param.rej_rcvd.reason;
		event.event = RDMA_CM_EVENT_REJECTED;
		event.param.conn.private_data = ib_event->private_data;
		event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
		break;
	default:
		printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
		       ib_event->event);
		goto out;
	}

	ret = id_priv->id.event_handler(&id_priv->id, &event);
	if (ret) {
		/* Destroy the CM ID by returning a non-zero value. */
		id_priv->cm_id.ib = NULL;
		cma_exch(id_priv, RDMA_CM_DESTROYING);
		mutex_unlock(&id_priv->handler_mutex);
		rdma_destroy_id(&id_priv->id);
		return ret;
	}
out:
	mutex_unlock(&id_priv->handler_mutex);
	return ret;
}

static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
					       struct ib_cm_event *ib_event)
{
	struct rdma_id_private *id_priv;
	struct rdma_cm_id *id;
	struct rdma_route *rt;
	int ret;

	id = rdma_create_id(listen_id->event_handler, listen_id->context,
			    listen_id->ps, ib_event->param.req_rcvd.qp_type);
	if (IS_ERR(id))
		return NULL;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (cma_save_net_info(id, listen_id, ib_event))
		goto err;

	rt = &id->route;
	rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
	rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
			       GFP_KERNEL);
	if (!rt->path_rec)
		goto err;

	rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
	if (rt->num_paths == 2)
		rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;

	if (cma_any_addr(cma_src_addr(id_priv))) {
		rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
		rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
		ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
	} else {
		ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
		if (ret)
			goto err;
	}
	rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);

	id_priv->state = RDMA_CM_CONNECT;
	return id_priv;

err:
	rdma_destroy_id(id);
	return NULL;
}

static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
					      struct ib_cm_event *ib_event)
{
	struct rdma_id_private *id_priv;
	struct rdma_cm_id *id;
	int ret;

	id = rdma_create_id(listen_id->event_handler, listen_id->context,
			    listen_id->ps, IB_QPT_UD);
	if (IS_ERR(id))
		return NULL;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (cma_save_net_info(id, listen_id, ib_event))
		goto err;

	if (!cma_any_addr((struct sockaddr *) &id->route.addr.src_addr)) {
		ret = cma_translate_addr(cma_src_addr(id_priv), &id->route.addr.dev_addr);
		if (ret)
			goto err;
	}

	id_priv->state = RDMA_CM_CONNECT;
	return id_priv;
err:
	rdma_destroy_id(id);
	return NULL;
}

static void cma_set_req_event_data(struct rdma_cm_event *event,
				   struct ib_cm_req_event_param *req_data,
				   void *private_data, int offset)
{
	event->param.conn.private_data = private_data + offset;
	event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
	event->param.conn.responder_resources = req_data->responder_resources;
	event->param.conn.initiator_depth = req_data->initiator_depth;
	event->param.conn.flow_control = req_data->flow_control;
	event->param.conn.retry_count = req_data->retry_count;
	event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
	event->param.conn.srq = req_data->srq;
	event->param.conn.qp_num = req_data->remote_qpn;
}

static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
{
	return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
		 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
		((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
		 (id->qp_type == IB_QPT_UD)) ||
		(!id->qp_type));
}

static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
{
	struct rdma_id_private *listen_id, *conn_id;
	struct rdma_cm_event event;
	int offset, ret;

	listen_id = cm_id->context;
	if (!cma_check_req_qp_type(&listen_id->id, ib_event))
		return -EINVAL;

	if (cma_disable_callback(listen_id, RDMA_CM_LISTEN))
		return -ECONNABORTED;

	memset(&event, 0, sizeof event);
	offset = cma_user_data_offset(listen_id);
	event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
	if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
		conn_id = cma_new_udp_id(&listen_id->id, ib_event);
		event.param.ud.private_data = ib_event->private_data + offset;
		event.param.ud.private_data_len =
				IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
	} else {
		conn_id = cma_new_conn_id(&listen_id->id, ib_event);
		cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
				       ib_event->private_data, offset);
	}
	if (!conn_id) {
		ret = -ENOMEM;
		goto err1;
	}

	mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
	ret = cma_acquire_dev(conn_id, listen_id);
	if (ret)
		goto err2;

	conn_id->cm_id.ib = cm_id;
	cm_id->context = conn_id;
	cm_id->cm_handler = cma_ib_handler;

	/*
	 * Protect against the user destroying conn_id from another thread
	 * until we're done accessing it.
	 */
	atomic_inc(&conn_id->refcount);
	ret = conn_id->id.event_handler(&conn_id->id, &event);
	if (ret)
		goto err3;
	/*
	 * Acquire mutex to prevent user executing rdma_destroy_id()
	 * while we're accessing the cm_id.
	 */
	mutex_lock(&lock);
	if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
	    (conn_id->id.qp_type != IB_QPT_UD))
		ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
	mutex_unlock(&lock);
	mutex_unlock(&conn_id->handler_mutex);
	mutex_unlock(&listen_id->handler_mutex);
	cma_deref_id(conn_id);
	return 0;

err3:
	cma_deref_id(conn_id);
	/* Destroy the CM ID by returning a non-zero value. */
	conn_id->cm_id.ib = NULL;
err2:
	cma_exch(conn_id, RDMA_CM_DESTROYING);
	mutex_unlock(&conn_id->handler_mutex);
err1:
	mutex_unlock(&listen_id->handler_mutex);
	if (conn_id)
		rdma_destroy_id(&conn_id->id);
	return ret;
}

__be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
{
	if (addr->sa_family == AF_IB)
		return ((struct sockaddr_ib *) addr)->sib_sid;

	return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
}
EXPORT_SYMBOL(rdma_get_service_id);

static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
				 struct ib_cm_compare_data *compare)
{
	struct cma_hdr *cma_data, *cma_mask;
	__be32 ip4_addr;
	struct in6_addr ip6_addr;

	memset(compare, 0, sizeof *compare);
	cma_data = (void *) compare->data;
	cma_mask = (void *) compare->mask;

	switch (addr->sa_family) {
	case AF_INET:
		ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
		cma_set_ip_ver(cma_data, 4);
		cma_set_ip_ver(cma_mask, 0xF);
		if (!cma_any_addr(addr)) {
			cma_data->dst_addr.ip4.addr = ip4_addr;
			cma_mask->dst_addr.ip4.addr = htonl(~0);
		}
		break;
	case AF_INET6:
		ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
		cma_set_ip_ver(cma_data, 6);
		cma_set_ip_ver(cma_mask, 0xF);
		if (!cma_any_addr(addr)) {
			cma_data->dst_addr.ip6 = ip6_addr;
			memset(&cma_mask->dst_addr.ip6, 0xFF,
			       sizeof cma_mask->dst_addr.ip6);
		}
		break;
	default:
		break;
	}
}

static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
{
	struct rdma_id_private *id_priv = iw_id->context;
	struct rdma_cm_event event;
	int ret = 0;
	struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
	struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;

	if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
		return 0;

	memset(&event, 0, sizeof event);
	switch (iw_event->event) {
	case IW_CM_EVENT_CLOSE:
		event.event = RDMA_CM_EVENT_DISCONNECTED;
		break;
	case IW_CM_EVENT_CONNECT_REPLY:
		memcpy(cma_src_addr(id_priv), laddr,
		       rdma_addr_size(laddr));
		memcpy(cma_dst_addr(id_priv), raddr,
		       rdma_addr_size(raddr));
		switch (iw_event->status) {
		case 0:
			event.event = RDMA_CM_EVENT_ESTABLISHED;
			event.param.conn.initiator_depth = iw_event->ird;
			event.param.conn.responder_resources = iw_event->ord;
			break;
		case -ECONNRESET:
		case -ECONNREFUSED:
			event.event = RDMA_CM_EVENT_REJECTED;
			break;
		case -ETIMEDOUT:
			event.event = RDMA_CM_EVENT_UNREACHABLE;
			break;
		default:
			event.event = RDMA_CM_EVENT_CONNECT_ERROR;
			break;
		}
		break;
	case IW_CM_EVENT_ESTABLISHED:
		event.event = RDMA_CM_EVENT_ESTABLISHED;
		event.param.conn.initiator_depth = iw_event->ird;
		event.param.conn.responder_resources = iw_event->ord;
		break;
	default:
		BUG_ON(1);
	}

	event.status = iw_event->status;
	event.param.conn.private_data = iw_event->private_data;
	event.param.conn.private_data_len = iw_event->private_data_len;
	ret = id_priv->id.event_handler(&id_priv->id, &event);
	if (ret) {
		/* Destroy the CM ID by returning a non-zero value. */
		id_priv->cm_id.iw = NULL;
		cma_exch(id_priv, RDMA_CM_DESTROYING);
		mutex_unlock(&id_priv->handler_mutex);
		rdma_destroy_id(&id_priv->id);
		return ret;
	}

	mutex_unlock(&id_priv->handler_mutex);
	return ret;
}

static int iw_conn_req_handler(struct iw_cm_id *cm_id,
			       struct iw_cm_event *iw_event)
{
	struct rdma_cm_id *new_cm_id;
	struct rdma_id_private *listen_id, *conn_id;
	struct rdma_cm_event event;
	int ret;
	struct ib_device_attr attr;
	struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
	struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;

	listen_id = cm_id->context;
	if (cma_disable_callback(listen_id, RDMA_CM_LISTEN))
		return -ECONNABORTED;

	/* Create a new RDMA id for the new IW CM ID */
	new_cm_id = rdma_create_id(listen_id->id.event_handler,
				   listen_id->id.context,
				   RDMA_PS_TCP, IB_QPT_RC);
	if (IS_ERR(new_cm_id)) {
		ret = -ENOMEM;
		goto out;
	}
	conn_id = container_of(new_cm_id, struct rdma_id_private, id);
	mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
	conn_id->state = RDMA_CM_CONNECT;

	ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
	if (ret) {
		mutex_unlock(&conn_id->handler_mutex);
		rdma_destroy_id(new_cm_id);
		goto out;
	}

	ret = cma_acquire_dev(conn_id, listen_id);
	if (ret) {
		mutex_unlock(&conn_id->handler_mutex);
		rdma_destroy_id(new_cm_id);
		goto out;
	}

	conn_id->cm_id.iw = cm_id;
	cm_id->context = conn_id;
	cm_id->cm_handler = cma_iw_handler;

	memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
	memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));

	ret = ib_query_device(conn_id->id.device, &attr);
	if (ret) {
		mutex_unlock(&conn_id->handler_mutex);
		rdma_destroy_id(new_cm_id);
		goto out;
	}

	memset(&event, 0, sizeof event);
	event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
	event.param.conn.private_data = iw_event->private_data;
	event.param.conn.private_data_len = iw_event->private_data_len;
	event.param.conn.initiator_depth = iw_event->ird;
	event.param.conn.responder_resources = iw_event->ord;

	/*
	 * Protect against the user destroying conn_id from another thread
	 * until we're done accessing it.
	 */
	atomic_inc(&conn_id->refcount);
	ret = conn_id->id.event_handler(&conn_id->id, &event);
	if (ret) {
		/* User wants to destroy the CM ID */
		conn_id->cm_id.iw = NULL;
		cma_exch(conn_id, RDMA_CM_DESTROYING);
		mutex_unlock(&conn_id->handler_mutex);
		cma_deref_id(conn_id);
		rdma_destroy_id(&conn_id->id);
		goto out;
	}

	mutex_unlock(&conn_id->handler_mutex);
	cma_deref_id(conn_id);

out:
	mutex_unlock(&listen_id->handler_mutex);
	return ret;
}

static int cma_ib_listen(struct rdma_id_private *id_priv)
{
	struct ib_cm_compare_data compare_data;
	struct sockaddr *addr;
	struct ib_cm_id	*id;
	__be64 svc_id;
	int ret;

	id = ib_create_cm_id(id_priv->id.device, cma_req_handler, id_priv);
	if (IS_ERR(id))
		return PTR_ERR(id);

	id_priv->cm_id.ib = id;

	addr = cma_src_addr(id_priv);
	svc_id = rdma_get_service_id(&id_priv->id, addr);
	if (cma_any_addr(addr) && !id_priv->afonly)
		ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
	else {
		cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
		ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
	}

	if (ret) {
		ib_destroy_cm_id(id_priv->cm_id.ib);
		id_priv->cm_id.ib = NULL;
	}

	return ret;
}

static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
{
	int ret;
	struct iw_cm_id	*id;

	id = iw_create_cm_id(id_priv->id.device,
			     iw_conn_req_handler,
			     id_priv);
	if (IS_ERR(id))
		return PTR_ERR(id);

	id->tos = id_priv->tos;
	id_priv->cm_id.iw = id;

	memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
	       rdma_addr_size(cma_src_addr(id_priv)));

	ret = iw_cm_listen(id_priv->cm_id.iw, backlog);

	if (ret) {
		iw_destroy_cm_id(id_priv->cm_id.iw);
		id_priv->cm_id.iw = NULL;
	}

	return ret;
}

static int cma_listen_handler(struct rdma_cm_id *id,
			      struct rdma_cm_event *event)
{
	struct rdma_id_private *id_priv = id->context;

	id->context = id_priv->id.context;
	id->event_handler = id_priv->id.event_handler;
	return id_priv->id.event_handler(id, event);
}

static void cma_listen_on_dev(struct rdma_id_private *id_priv,
			      struct cma_device *cma_dev)
{
	struct rdma_id_private *dev_id_priv;
	struct rdma_cm_id *id;
	int ret;

	if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
		return;

	id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps,
			    id_priv->id.qp_type);
	if (IS_ERR(id))
		return;

	dev_id_priv = container_of(id, struct rdma_id_private, id);

	dev_id_priv->state = RDMA_CM_ADDR_BOUND;
	memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
	       rdma_addr_size(cma_src_addr(id_priv)));

	cma_attach_to_dev(dev_id_priv, cma_dev);
	list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
	atomic_inc(&id_priv->refcount);
	dev_id_priv->internal_id = 1;
	dev_id_priv->afonly = id_priv->afonly;

	ret = rdma_listen(id, id_priv->backlog);
	if (ret)
		printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
		       "listening on device %s\n", ret, cma_dev->device->name);
}

static void cma_listen_on_all(struct rdma_id_private *id_priv)
{
	struct cma_device *cma_dev;

	mutex_lock(&lock);
	list_add_tail(&id_priv->list, &listen_any_list);
	list_for_each_entry(cma_dev, &dev_list, list)
		cma_listen_on_dev(id_priv, cma_dev);
	mutex_unlock(&lock);
}

void rdma_set_service_type(struct rdma_cm_id *id, int tos)
{
	struct rdma_id_private *id_priv;

	id_priv = container_of(id, struct rdma_id_private, id);
	id_priv->tos = (u8) tos;
}
EXPORT_SYMBOL(rdma_set_service_type);

static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
			      void *context)
{
	struct cma_work *work = context;
	struct rdma_route *route;

	route = &work->id->id.route;

	if (!status) {
		route->num_paths = 1;
		*route->path_rec = *path_rec;
	} else {
		work->old_state = RDMA_CM_ROUTE_QUERY;
		work->new_state = RDMA_CM_ADDR_RESOLVED;
		work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
		work->event.status = status;
	}

	queue_work(cma_wq, &work->work);
}

static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
			      struct cma_work *work)
{
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	struct ib_sa_path_rec path_rec;
	ib_sa_comp_mask comp_mask;
	struct sockaddr_in6 *sin6;
	struct sockaddr_ib *sib;

	memset(&path_rec, 0, sizeof path_rec);
	rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
	rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
	path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
	path_rec.numb_path = 1;
	path_rec.reversible = 1;
	path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));

	comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
		    IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
		    IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;

	switch (cma_family(id_priv)) {
	case AF_INET:
		path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
		comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
		break;
	case AF_INET6:
		sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
		path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
		comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
		break;
	case AF_IB:
		sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
		path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
		comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
		break;
	}

	id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
					       id_priv->id.port_num, &path_rec,
					       comp_mask, timeout_ms,
					       GFP_KERNEL, cma_query_handler,
					       work, &id_priv->query);

	return (id_priv->query_id < 0) ? id_priv->query_id : 0;
}

static void cma_work_handler(struct work_struct *_work)
{
	struct cma_work *work = container_of(_work, struct cma_work, work);
	struct rdma_id_private *id_priv = work->id;
	int destroy = 0;

	mutex_lock(&id_priv->handler_mutex);
	if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
		goto out;

	if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
		cma_exch(id_priv, RDMA_CM_DESTROYING);
		destroy = 1;
	}
out:
	mutex_unlock(&id_priv->handler_mutex);
	cma_deref_id(id_priv);
	if (destroy)
		rdma_destroy_id(&id_priv->id);
	kfree(work);
}

static void cma_ndev_work_handler(struct work_struct *_work)
{
	struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
	struct rdma_id_private *id_priv = work->id;
	int destroy = 0;

	mutex_lock(&id_priv->handler_mutex);
	if (id_priv->state == RDMA_CM_DESTROYING ||
	    id_priv->state == RDMA_CM_DEVICE_REMOVAL)
		goto out;

	if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
		cma_exch(id_priv, RDMA_CM_DESTROYING);
		destroy = 1;
	}

out:
	mutex_unlock(&id_priv->handler_mutex);
	cma_deref_id(id_priv);
	if (destroy)
		rdma_destroy_id(&id_priv->id);
	kfree(work);
}

static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
{
	struct rdma_route *route = &id_priv->id.route;
	struct cma_work *work;
	int ret;

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

	work->id = id_priv;
	INIT_WORK(&work->work, cma_work_handler);
	work->old_state = RDMA_CM_ROUTE_QUERY;
	work->new_state = RDMA_CM_ROUTE_RESOLVED;
	work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;

	route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
	if (!route->path_rec) {
		ret = -ENOMEM;
		goto err1;
	}

	ret = cma_query_ib_route(id_priv, timeout_ms, work);
	if (ret)
		goto err2;

	return 0;
err2:
	kfree(route->path_rec);
	route->path_rec = NULL;
err1:
	kfree(work);
	return ret;
}

int rdma_set_ib_paths(struct rdma_cm_id *id,
		      struct ib_sa_path_rec *path_rec, int num_paths)
{
	struct rdma_id_private *id_priv;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
			   RDMA_CM_ROUTE_RESOLVED))
		return -EINVAL;

	id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
				     GFP_KERNEL);
	if (!id->route.path_rec) {
		ret = -ENOMEM;
		goto err;
	}

	id->route.num_paths = num_paths;
	return 0;
err:
	cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
	return ret;
}
EXPORT_SYMBOL(rdma_set_ib_paths);

static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
{
	struct cma_work *work;

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

	work->id = id_priv;
	INIT_WORK(&work->work, cma_work_handler);
	work->old_state = RDMA_CM_ROUTE_QUERY;
	work->new_state = RDMA_CM_ROUTE_RESOLVED;
	work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
	queue_work(cma_wq, &work->work);
	return 0;
}

static int iboe_tos_to_sl(struct net_device *ndev, int tos)
{
	int prio;
	struct net_device *dev;

	prio = rt_tos2priority(tos);
	dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
		vlan_dev_real_dev(ndev) : ndev;

	if (dev->num_tc)
		return netdev_get_prio_tc_map(dev, prio);

#if IS_ENABLED(CONFIG_VLAN_8021Q)
	if (ndev->priv_flags & IFF_802_1Q_VLAN)
		return (vlan_dev_get_egress_qos_mask(ndev, prio) &
			VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
#endif
	return 0;
}

static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
{
	struct rdma_route *route = &id_priv->id.route;
	struct rdma_addr *addr = &route->addr;
	struct cma_work *work;
	int ret;
	struct net_device *ndev = NULL;


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

	work->id = id_priv;
	INIT_WORK(&work->work, cma_work_handler);

	route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
	if (!route->path_rec) {
		ret = -ENOMEM;
		goto err1;
	}

	route->num_paths = 1;

	if (addr->dev_addr.bound_dev_if)
		ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
	if (!ndev) {
		ret = -ENODEV;
		goto err2;
	}

	route->path_rec->vlan_id = rdma_vlan_dev_vlan_id(ndev);
	memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
	memcpy(route->path_rec->smac, ndev->dev_addr, ndev->addr_len);

	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
		    &route->path_rec->sgid);
	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
		    &route->path_rec->dgid);

	route->path_rec->hop_limit = 1;
	route->path_rec->reversible = 1;
	route->path_rec->pkey = cpu_to_be16(0xffff);
	route->path_rec->mtu_selector = IB_SA_EQ;
	route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
	route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
	route->path_rec->rate_selector = IB_SA_EQ;
	route->path_rec->rate = iboe_get_rate(ndev);
	dev_put(ndev);
	route->path_rec->packet_life_time_selector = IB_SA_EQ;
	route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
	if (!route->path_rec->mtu) {
		ret = -EINVAL;
		goto err2;
	}

	work->old_state = RDMA_CM_ROUTE_QUERY;
	work->new_state = RDMA_CM_ROUTE_RESOLVED;
	work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
	work->event.status = 0;

	queue_work(cma_wq, &work->work);

	return 0;

err2:
	kfree(route->path_rec);
	route->path_rec = NULL;
err1:
	kfree(work);
	return ret;
}

int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
{
	struct rdma_id_private *id_priv;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
		return -EINVAL;

	atomic_inc(&id_priv->refcount);
	if (rdma_cap_ib_sa(id->device, id->port_num))
		ret = cma_resolve_ib_route(id_priv, timeout_ms);
	else if (rdma_protocol_roce(id->device, id->port_num))
		ret = cma_resolve_iboe_route(id_priv);
	else if (rdma_protocol_iwarp(id->device, id->port_num))
		ret = cma_resolve_iw_route(id_priv, timeout_ms);
	else
		ret = -ENOSYS;

	if (ret)
		goto err;

	return 0;
err:
	cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
	cma_deref_id(id_priv);
	return ret;
}
EXPORT_SYMBOL(rdma_resolve_route);

static void cma_set_loopback(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET:
		((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
		break;
	case AF_INET6:
		ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
			      0, 0, 0, htonl(1));
		break;
	default:
		ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
			    0, 0, 0, htonl(1));
		break;
	}
}

static int cma_bind_loopback(struct rdma_id_private *id_priv)
{
	struct cma_device *cma_dev, *cur_dev;
	struct ib_port_attr port_attr;
	union ib_gid gid;
	u16 pkey;
	int ret;
	u8 p;

	cma_dev = NULL;
	mutex_lock(&lock);
	list_for_each_entry(cur_dev, &dev_list, list) {
		if (cma_family(id_priv) == AF_IB &&
		    !rdma_cap_ib_cm(cur_dev->device, 1))
			continue;

		if (!cma_dev)
			cma_dev = cur_dev;

		for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
			if (!ib_query_port(cur_dev->device, p, &port_attr) &&
			    port_attr.state == IB_PORT_ACTIVE) {
				cma_dev = cur_dev;
				goto port_found;
			}
		}
	}

	if (!cma_dev) {
		ret = -ENODEV;
		goto out;
	}

	p = 1;

port_found:
	ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
	if (ret)
		goto out;

	ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
	if (ret)
		goto out;

	id_priv->id.route.addr.dev_addr.dev_type =
		(rdma_protocol_ib(cma_dev->device, p)) ?
		ARPHRD_INFINIBAND : ARPHRD_ETHER;

	rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
	ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
	id_priv->id.port_num = p;
	cma_attach_to_dev(id_priv, cma_dev);
	cma_set_loopback(cma_src_addr(id_priv));
out:
	mutex_unlock(&lock);
	return ret;
}

static void addr_handler(int status, struct sockaddr *src_addr,
			 struct rdma_dev_addr *dev_addr, void *context)
{
	struct rdma_id_private *id_priv = context;
	struct rdma_cm_event event;

	memset(&event, 0, sizeof event);
	mutex_lock(&id_priv->handler_mutex);
	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
			   RDMA_CM_ADDR_RESOLVED))
		goto out;

	memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
	if (!status && !id_priv->cma_dev)
		status = cma_acquire_dev(id_priv, NULL);

	if (status) {
		if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
				   RDMA_CM_ADDR_BOUND))
			goto out;
		event.event = RDMA_CM_EVENT_ADDR_ERROR;
		event.status = status;
	} else
		event.event = RDMA_CM_EVENT_ADDR_RESOLVED;

	if (id_priv->id.event_handler(&id_priv->id, &event)) {
		cma_exch(id_priv, RDMA_CM_DESTROYING);
		mutex_unlock(&id_priv->handler_mutex);
		cma_deref_id(id_priv);
		rdma_destroy_id(&id_priv->id);
		return;
	}
out:
	mutex_unlock(&id_priv->handler_mutex);
	cma_deref_id(id_priv);
}

static int cma_resolve_loopback(struct rdma_id_private *id_priv)
{
	struct cma_work *work;
	union ib_gid gid;
	int ret;

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

	if (!id_priv->cma_dev) {
		ret = cma_bind_loopback(id_priv);
		if (ret)
			goto err;
	}

	rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
	rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);

	work->id = id_priv;
	INIT_WORK(&work->work, cma_work_handler);
	work->old_state = RDMA_CM_ADDR_QUERY;
	work->new_state = RDMA_CM_ADDR_RESOLVED;
	work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
	queue_work(cma_wq, &work->work);
	return 0;
err:
	kfree(work);
	return ret;
}

static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
{
	struct cma_work *work;
	int ret;

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

	if (!id_priv->cma_dev) {
		ret = cma_resolve_ib_dev(id_priv);
		if (ret)
			goto err;
	}

	rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
		&(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));

	work->id = id_priv;
	INIT_WORK(&work->work, cma_work_handler);
	work->old_state = RDMA_CM_ADDR_QUERY;
	work->new_state = RDMA_CM_ADDR_RESOLVED;
	work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
	queue_work(cma_wq, &work->work);
	return 0;
err:
	kfree(work);
	return ret;
}

static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
			 struct sockaddr *dst_addr)
{
	if (!src_addr || !src_addr->sa_family) {
		src_addr = (struct sockaddr *) &id->route.addr.src_addr;
		src_addr->sa_family = dst_addr->sa_family;
		if (dst_addr->sa_family == AF_INET6) {
			struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
			struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
			src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
			if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
				id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
		} else if (dst_addr->sa_family == AF_IB) {
			((struct sockaddr_ib *) src_addr)->sib_pkey =
				((struct sockaddr_ib *) dst_addr)->sib_pkey;
		}
	}
	return rdma_bind_addr(id, src_addr);
}

int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
		      struct sockaddr *dst_addr, int timeout_ms)
{
	struct rdma_id_private *id_priv;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (id_priv->state == RDMA_CM_IDLE) {
		ret = cma_bind_addr(id, src_addr, dst_addr);
		if (ret)
			return ret;
	}

	if (cma_family(id_priv) != dst_addr->sa_family)
		return -EINVAL;

	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
		return -EINVAL;

	atomic_inc(&id_priv->refcount);
	memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
	if (cma_any_addr(dst_addr)) {
		ret = cma_resolve_loopback(id_priv);
	} else {
		if (dst_addr->sa_family == AF_IB) {
			ret = cma_resolve_ib_addr(id_priv);
		} else {
			ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
					      dst_addr, &id->route.addr.dev_addr,
					      timeout_ms, addr_handler, id_priv);
		}
	}
	if (ret)
		goto err;

	return 0;
err:
	cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
	cma_deref_id(id_priv);
	return ret;
}
EXPORT_SYMBOL(rdma_resolve_addr);

int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
{
	struct rdma_id_private *id_priv;
	unsigned long flags;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	spin_lock_irqsave(&id_priv->lock, flags);
	if (reuse || id_priv->state == RDMA_CM_IDLE) {
		id_priv->reuseaddr = reuse;
		ret = 0;
	} else {
		ret = -EINVAL;
	}
	spin_unlock_irqrestore(&id_priv->lock, flags);
	return ret;
}
EXPORT_SYMBOL(rdma_set_reuseaddr);

int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
{
	struct rdma_id_private *id_priv;
	unsigned long flags;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	spin_lock_irqsave(&id_priv->lock, flags);
	if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
		id_priv->options |= (1 << CMA_OPTION_AFONLY);
		id_priv->afonly = afonly;
		ret = 0;
	} else {
		ret = -EINVAL;
	}
	spin_unlock_irqrestore(&id_priv->lock, flags);
	return ret;
}
EXPORT_SYMBOL(rdma_set_afonly);

static void cma_bind_port(struct rdma_bind_list *bind_list,
			  struct rdma_id_private *id_priv)
{
	struct sockaddr *addr;
	struct sockaddr_ib *sib;
	u64 sid, mask;
	__be16 port;

	addr = cma_src_addr(id_priv);
	port = htons(bind_list->port);

	switch (addr->sa_family) {
	case AF_INET:
		((struct sockaddr_in *) addr)->sin_port = port;
		break;
	case AF_INET6:
		((struct sockaddr_in6 *) addr)->sin6_port = port;
		break;
	case AF_IB:
		sib = (struct sockaddr_ib *) addr;
		sid = be64_to_cpu(sib->sib_sid);
		mask = be64_to_cpu(sib->sib_sid_mask);
		sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
		sib->sib_sid_mask = cpu_to_be64(~0ULL);
		break;
	}
	id_priv->bind_list = bind_list;
	hlist_add_head(&id_priv->node, &bind_list->owners);
}

static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
			  unsigned short snum)
{
	struct rdma_bind_list *bind_list;
	int ret;

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

	ret = idr_alloc(ps, bind_list, snum, snum + 1, GFP_KERNEL);
	if (ret < 0)
		goto err;

	bind_list->ps = ps;
	bind_list->port = (unsigned short)ret;
	cma_bind_port(bind_list, id_priv);
	return 0;
err:
	kfree(bind_list);
	return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
}

static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
{
	static unsigned int last_used_port;
	int low, high, remaining;
	unsigned int rover;

	inet_get_local_port_range(&init_net, &low, &high);
	remaining = (high - low) + 1;
	rover = prandom_u32() % remaining + low;
retry:
	if (last_used_port != rover &&
	    !idr_find(ps, (unsigned short) rover)) {
		int ret = cma_alloc_port(ps, id_priv, rover);
		/*
		 * Remember previously used port number in order to avoid
		 * re-using same port immediately after it is closed.
		 */
		if (!ret)
			last_used_port = rover;
		if (ret != -EADDRNOTAVAIL)
			return ret;
	}
	if (--remaining) {
		rover++;
		if ((rover < low) || (rover > high))
			rover = low;
		goto retry;
	}
	return -EADDRNOTAVAIL;
}

/*
 * Check that the requested port is available.  This is called when trying to
 * bind to a specific port, or when trying to listen on a bound port.  In
 * the latter case, the provided id_priv may already be on the bind_list, but
 * we still need to check that it's okay to start listening.
 */
static int cma_check_port(struct rdma_bind_list *bind_list,
			  struct rdma_id_private *id_priv, uint8_t reuseaddr)
{
	struct rdma_id_private *cur_id;
	struct sockaddr *addr, *cur_addr;

	addr = cma_src_addr(id_priv);
	hlist_for_each_entry(cur_id, &bind_list->owners, node) {
		if (id_priv == cur_id)
			continue;

		if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
		    cur_id->reuseaddr)
			continue;

		cur_addr = cma_src_addr(cur_id);
		if (id_priv->afonly && cur_id->afonly &&
		    (addr->sa_family != cur_addr->sa_family))
			continue;

		if (cma_any_addr(addr) || cma_any_addr(cur_addr))
			return -EADDRNOTAVAIL;

		if (!cma_addr_cmp(addr, cur_addr))
			return -EADDRINUSE;
	}
	return 0;
}

static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
{
	struct rdma_bind_list *bind_list;
	unsigned short snum;
	int ret;

	snum = ntohs(cma_port(cma_src_addr(id_priv)));
	if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
		return -EACCES;

	bind_list = idr_find(ps, snum);
	if (!bind_list) {
		ret = cma_alloc_port(ps, id_priv, snum);
	} else {
		ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
		if (!ret)
			cma_bind_port(bind_list, id_priv);
	}
	return ret;
}

static int cma_bind_listen(struct rdma_id_private *id_priv)
{
	struct rdma_bind_list *bind_list = id_priv->bind_list;
	int ret = 0;

	mutex_lock(&lock);
	if (bind_list->owners.first->next)
		ret = cma_check_port(bind_list, id_priv, 0);
	mutex_unlock(&lock);
	return ret;
}

static struct idr *cma_select_inet_ps(struct rdma_id_private *id_priv)
{
	switch (id_priv->id.ps) {
	case RDMA_PS_TCP:
		return &tcp_ps;
	case RDMA_PS_UDP:
		return &udp_ps;
	case RDMA_PS_IPOIB:
		return &ipoib_ps;
	case RDMA_PS_IB:
		return &ib_ps;
	default:
		return NULL;
	}
}

static struct idr *cma_select_ib_ps(struct rdma_id_private *id_priv)
{
	struct idr *ps = NULL;
	struct sockaddr_ib *sib;
	u64 sid_ps, mask, sid;

	sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
	mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
	sid = be64_to_cpu(sib->sib_sid) & mask;

	if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
		sid_ps = RDMA_IB_IP_PS_IB;
		ps = &ib_ps;
	} else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
		   (sid == (RDMA_IB_IP_PS_TCP & mask))) {
		sid_ps = RDMA_IB_IP_PS_TCP;
		ps = &tcp_ps;
	} else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
		   (sid == (RDMA_IB_IP_PS_UDP & mask))) {
		sid_ps = RDMA_IB_IP_PS_UDP;
		ps = &udp_ps;
	}

	if (ps) {
		sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
		sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
						be64_to_cpu(sib->sib_sid_mask));
	}
	return ps;
}

static int cma_get_port(struct rdma_id_private *id_priv)
{
	struct idr *ps;
	int ret;

	if (cma_family(id_priv) != AF_IB)
		ps = cma_select_inet_ps(id_priv);
	else
		ps = cma_select_ib_ps(id_priv);
	if (!ps)
		return -EPROTONOSUPPORT;

	mutex_lock(&lock);
	if (cma_any_port(cma_src_addr(id_priv)))
		ret = cma_alloc_any_port(ps, id_priv);
	else
		ret = cma_use_port(ps, id_priv);
	mutex_unlock(&lock);

	return ret;
}

static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
			       struct sockaddr *addr)
{
#if IS_ENABLED(CONFIG_IPV6)
	struct sockaddr_in6 *sin6;

	if (addr->sa_family != AF_INET6)
		return 0;

	sin6 = (struct sockaddr_in6 *) addr;

	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
		return 0;

	if (!sin6->sin6_scope_id)
			return -EINVAL;

	dev_addr->bound_dev_if = sin6->sin6_scope_id;
#endif
	return 0;
}

int rdma_listen(struct rdma_cm_id *id, int backlog)
{
	struct rdma_id_private *id_priv;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (id_priv->state == RDMA_CM_IDLE) {
		id->route.addr.src_addr.ss_family = AF_INET;
		ret = rdma_bind_addr(id, cma_src_addr(id_priv));
		if (ret)
			return ret;
	}

	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
		return -EINVAL;

	if (id_priv->reuseaddr) {
		ret = cma_bind_listen(id_priv);
		if (ret)
			goto err;
	}

	id_priv->backlog = backlog;
	if (id->device) {
		if (rdma_cap_ib_cm(id->device, 1)) {
			ret = cma_ib_listen(id_priv);
			if (ret)
				goto err;
		} else if (rdma_cap_iw_cm(id->device, 1)) {
			ret = cma_iw_listen(id_priv, backlog);
			if (ret)
				goto err;
		} else {
			ret = -ENOSYS;
			goto err;
		}
	} else
		cma_listen_on_all(id_priv);

	return 0;
err:
	id_priv->backlog = 0;
	cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
	return ret;
}
EXPORT_SYMBOL(rdma_listen);

int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
{
	struct rdma_id_private *id_priv;
	int ret;

	if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
	    addr->sa_family != AF_IB)
		return -EAFNOSUPPORT;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
		return -EINVAL;

	ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
	if (ret)
		goto err1;

	memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
	if (!cma_any_addr(addr)) {
		ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
		if (ret)
			goto err1;

		ret = cma_acquire_dev(id_priv, NULL);
		if (ret)
			goto err1;
	}

	if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
		if (addr->sa_family == AF_INET)
			id_priv->afonly = 1;
#if IS_ENABLED(CONFIG_IPV6)
		else if (addr->sa_family == AF_INET6)
			id_priv->afonly = init_net.ipv6.sysctl.bindv6only;
#endif
	}
	ret = cma_get_port(id_priv);
	if (ret)
		goto err2;

	return 0;
err2:
	if (id_priv->cma_dev)
		cma_release_dev(id_priv);
err1:
	cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
	return ret;
}
EXPORT_SYMBOL(rdma_bind_addr);

static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
{
	struct cma_hdr *cma_hdr;

	cma_hdr = hdr;
	cma_hdr->cma_version = CMA_VERSION;
	if (cma_family(id_priv) == AF_INET) {
		struct sockaddr_in *src4, *dst4;

		src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
		dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);

		cma_set_ip_ver(cma_hdr, 4);
		cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
		cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
		cma_hdr->port = src4->sin_port;
	} else if (cma_family(id_priv) == AF_INET6) {
		struct sockaddr_in6 *src6, *dst6;

		src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
		dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);

		cma_set_ip_ver(cma_hdr, 6);
		cma_hdr->src_addr.ip6 = src6->sin6_addr;
		cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
		cma_hdr->port = src6->sin6_port;
	}
	return 0;
}

static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
				struct ib_cm_event *ib_event)
{
	struct rdma_id_private *id_priv = cm_id->context;
	struct rdma_cm_event event;
	struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
	int ret = 0;

	if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
		return 0;

	memset(&event, 0, sizeof event);
	switch (ib_event->event) {
	case IB_CM_SIDR_REQ_ERROR:
		event.event = RDMA_CM_EVENT_UNREACHABLE;
		event.status = -ETIMEDOUT;
		break;
	case IB_CM_SIDR_REP_RECEIVED:
		event.param.ud.private_data = ib_event->private_data;
		event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
		if (rep->status != IB_SIDR_SUCCESS) {
			event.event = RDMA_CM_EVENT_UNREACHABLE;
			event.status = ib_event->param.sidr_rep_rcvd.status;
			break;
		}
		ret = cma_set_qkey(id_priv, rep->qkey);
		if (ret) {
			event.event = RDMA_CM_EVENT_ADDR_ERROR;
			event.status = ret;
			break;
		}
		ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
				     id_priv->id.route.path_rec,
				     &event.param.ud.ah_attr);
		event.param.ud.qp_num = rep->qpn;
		event.param.ud.qkey = rep->qkey;
		event.event = RDMA_CM_EVENT_ESTABLISHED;
		event.status = 0;
		break;
	default:
		printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
		       ib_event->event);
		goto out;
	}

	ret = id_priv->id.event_handler(&id_priv->id, &event);
	if (ret) {
		/* Destroy the CM ID by returning a non-zero value. */
		id_priv->cm_id.ib = NULL;
		cma_exch(id_priv, RDMA_CM_DESTROYING);
		mutex_unlock(&id_priv->handler_mutex);
		rdma_destroy_id(&id_priv->id);
		return ret;
	}
out:
	mutex_unlock(&id_priv->handler_mutex);
	return ret;
}

static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
			      struct rdma_conn_param *conn_param)
{
	struct ib_cm_sidr_req_param req;
	struct ib_cm_id	*id;
	void *private_data;
	int offset, ret;

	memset(&req, 0, sizeof req);
	offset = cma_user_data_offset(id_priv);
	req.private_data_len = offset + conn_param->private_data_len;
	if (req.private_data_len < conn_param->private_data_len)
		return -EINVAL;

	if (req.private_data_len) {
		private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
		if (!private_data)
			return -ENOMEM;
	} else {
		private_data = NULL;
	}

	if (conn_param->private_data && conn_param->private_data_len)
		memcpy(private_data + offset, conn_param->private_data,
		       conn_param->private_data_len);

	if (private_data) {
		ret = cma_format_hdr(private_data, id_priv);
		if (ret)
			goto out;
		req.private_data = private_data;
	}

	id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
			     id_priv);
	if (IS_ERR(id)) {
		ret = PTR_ERR(id);
		goto out;
	}
	id_priv->cm_id.ib = id;

	req.path = id_priv->id.route.path_rec;
	req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
	req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
	req.max_cm_retries = CMA_MAX_CM_RETRIES;

	ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
	if (ret) {
		ib_destroy_cm_id(id_priv->cm_id.ib);
		id_priv->cm_id.ib = NULL;
	}
out:
	kfree(private_data);
	return ret;
}

static int cma_connect_ib(struct rdma_id_private *id_priv,
			  struct rdma_conn_param *conn_param)
{
	struct ib_cm_req_param req;
	struct rdma_route *route;
	void *private_data;
	struct ib_cm_id	*id;
	int offset, ret;

	memset(&req, 0, sizeof req);
	offset = cma_user_data_offset(id_priv);
	req.private_data_len = offset + conn_param->private_data_len;
	if (req.private_data_len < conn_param->private_data_len)
		return -EINVAL;

	if (req.private_data_len) {
		private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
		if (!private_data)
			return -ENOMEM;
	} else {
		private_data = NULL;
	}

	if (conn_param->private_data && conn_param->private_data_len)
		memcpy(private_data + offset, conn_param->private_data,
		       conn_param->private_data_len);

	id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
	if (IS_ERR(id)) {
		ret = PTR_ERR(id);
		goto out;
	}
	id_priv->cm_id.ib = id;

	route = &id_priv->id.route;
	if (private_data) {
		ret = cma_format_hdr(private_data, id_priv);
		if (ret)
			goto out;
		req.private_data = private_data;
	}

	req.primary_path = &route->path_rec[0];
	if (route->num_paths == 2)
		req.alternate_path = &route->path_rec[1];

	req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
	req.qp_num = id_priv->qp_num;
	req.qp_type = id_priv->id.qp_type;
	req.starting_psn = id_priv->seq_num;
	req.responder_resources = conn_param->responder_resources;
	req.initiator_depth = conn_param->initiator_depth;
	req.flow_control = conn_param->flow_control;
	req.retry_count = min_t(u8, 7, conn_param->retry_count);
	req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
	req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
	req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
	req.max_cm_retries = CMA_MAX_CM_RETRIES;
	req.srq = id_priv->srq ? 1 : 0;

	ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
out:
	if (ret && !IS_ERR(id)) {
		ib_destroy_cm_id(id);
		id_priv->cm_id.ib = NULL;
	}

	kfree(private_data);
	return ret;
}

static int cma_connect_iw(struct rdma_id_private *id_priv,
			  struct rdma_conn_param *conn_param)
{
	struct iw_cm_id *cm_id;
	int ret;
	struct iw_cm_conn_param iw_param;

	cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
	if (IS_ERR(cm_id))
		return PTR_ERR(cm_id);

	cm_id->tos = id_priv->tos;
	id_priv->cm_id.iw = cm_id;

	memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
	       rdma_addr_size(cma_src_addr(id_priv)));
	memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
	       rdma_addr_size(cma_dst_addr(id_priv)));

	ret = cma_modify_qp_rtr(id_priv, conn_param);
	if (ret)
		goto out;

	if (conn_param) {
		iw_param.ord = conn_param->initiator_depth;
		iw_param.ird = conn_param->responder_resources;
		iw_param.private_data = conn_param->private_data;
		iw_param.private_data_len = conn_param->private_data_len;
		iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
	} else {
		memset(&iw_param, 0, sizeof iw_param);
		iw_param.qpn = id_priv->qp_num;
	}
	ret = iw_cm_connect(cm_id, &iw_param);
out:
	if (ret) {
		iw_destroy_cm_id(cm_id);
		id_priv->cm_id.iw = NULL;
	}
	return ret;
}

int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
{
	struct rdma_id_private *id_priv;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
		return -EINVAL;

	if (!id->qp) {
		id_priv->qp_num = conn_param->qp_num;
		id_priv->srq = conn_param->srq;
	}

	if (rdma_cap_ib_cm(id->device, id->port_num)) {
		if (id->qp_type == IB_QPT_UD)
			ret = cma_resolve_ib_udp(id_priv, conn_param);
		else
			ret = cma_connect_ib(id_priv, conn_param);
	} else if (rdma_cap_iw_cm(id->device, id->port_num))
		ret = cma_connect_iw(id_priv, conn_param);
	else
		ret = -ENOSYS;
	if (ret)
		goto err;

	return 0;
err:
	cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
	return ret;
}
EXPORT_SYMBOL(rdma_connect);

static int cma_accept_ib(struct rdma_id_private *id_priv,
			 struct rdma_conn_param *conn_param)
{
	struct ib_cm_rep_param rep;
	int ret;

	ret = cma_modify_qp_rtr(id_priv, conn_param);
	if (ret)
		goto out;

	ret = cma_modify_qp_rts(id_priv, conn_param);
	if (ret)
		goto out;

	memset(&rep, 0, sizeof rep);
	rep.qp_num = id_priv->qp_num;
	rep.starting_psn = id_priv->seq_num;
	rep.private_data = conn_param->private_data;
	rep.private_data_len = conn_param->private_data_len;
	rep.responder_resources = conn_param->responder_resources;
	rep.initiator_depth = conn_param->initiator_depth;
	rep.failover_accepted = 0;
	rep.flow_control = conn_param->flow_control;
	rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
	rep.srq = id_priv->srq ? 1 : 0;

	ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
out:
	return ret;
}

static int cma_accept_iw(struct rdma_id_private *id_priv,
		  struct rdma_conn_param *conn_param)
{
	struct iw_cm_conn_param iw_param;
	int ret;

	ret = cma_modify_qp_rtr(id_priv, conn_param);
	if (ret)
		return ret;

	iw_param.ord = conn_param->initiator_depth;
	iw_param.ird = conn_param->responder_resources;
	iw_param.private_data = conn_param->private_data;
	iw_param.private_data_len = conn_param->private_data_len;
	if (id_priv->id.qp) {
		iw_param.qpn = id_priv->qp_num;
	} else
		iw_param.qpn = conn_param->qp_num;

	return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
}

static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
			     enum ib_cm_sidr_status status, u32 qkey,
			     const void *private_data, int private_data_len)
{
	struct ib_cm_sidr_rep_param rep;
	int ret;

	memset(&rep, 0, sizeof rep);
	rep.status = status;
	if (status == IB_SIDR_SUCCESS) {
		ret = cma_set_qkey(id_priv, qkey);
		if (ret)
			return ret;
		rep.qp_num = id_priv->qp_num;
		rep.qkey = id_priv->qkey;
	}
	rep.private_data = private_data;
	rep.private_data_len = private_data_len;

	return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
}

int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
{
	struct rdma_id_private *id_priv;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);

	id_priv->owner = task_pid_nr(current);

	if (!cma_comp(id_priv, RDMA_CM_CONNECT))
		return -EINVAL;

	if (!id->qp && conn_param) {
		id_priv->qp_num = conn_param->qp_num;
		id_priv->srq = conn_param->srq;
	}

	if (rdma_cap_ib_cm(id->device, id->port_num)) {
		if (id->qp_type == IB_QPT_UD) {
			if (conn_param)
				ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
							conn_param->qkey,
							conn_param->private_data,
							conn_param->private_data_len);
			else
				ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
							0, NULL, 0);
		} else {
			if (conn_param)
				ret = cma_accept_ib(id_priv, conn_param);
			else
				ret = cma_rep_recv(id_priv);
		}
	} else if (rdma_cap_iw_cm(id->device, id->port_num))
		ret = cma_accept_iw(id_priv, conn_param);
	else
		ret = -ENOSYS;

	if (ret)
		goto reject;

	return 0;
reject:
	cma_modify_qp_err(id_priv);
	rdma_reject(id, NULL, 0);
	return ret;
}
EXPORT_SYMBOL(rdma_accept);

int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
{
	struct rdma_id_private *id_priv;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!id_priv->cm_id.ib)
		return -EINVAL;

	switch (id->device->node_type) {
	case RDMA_NODE_IB_CA:
		ret = ib_cm_notify(id_priv->cm_id.ib, event);
		break;
	default:
		ret = 0;
		break;
	}
	return ret;
}
EXPORT_SYMBOL(rdma_notify);

int rdma_reject(struct rdma_cm_id *id, const void *private_data,
		u8 private_data_len)
{
	struct rdma_id_private *id_priv;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!id_priv->cm_id.ib)
		return -EINVAL;

	if (rdma_cap_ib_cm(id->device, id->port_num)) {
		if (id->qp_type == IB_QPT_UD)
			ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
						private_data, private_data_len);
		else
			ret = ib_send_cm_rej(id_priv->cm_id.ib,
					     IB_CM_REJ_CONSUMER_DEFINED, NULL,
					     0, private_data, private_data_len);
	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
		ret = iw_cm_reject(id_priv->cm_id.iw,
				   private_data, private_data_len);
	} else
		ret = -ENOSYS;

	return ret;
}
EXPORT_SYMBOL(rdma_reject);

int rdma_disconnect(struct rdma_cm_id *id)
{
	struct rdma_id_private *id_priv;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!id_priv->cm_id.ib)
		return -EINVAL;

	if (rdma_cap_ib_cm(id->device, id->port_num)) {
		ret = cma_modify_qp_err(id_priv);
		if (ret)
			goto out;
		/* Initiate or respond to a disconnect. */
		if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
			ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
		ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
	} else
		ret = -EINVAL;

out:
	return ret;
}
EXPORT_SYMBOL(rdma_disconnect);

static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
{
	struct rdma_id_private *id_priv;
	struct cma_multicast *mc = multicast->context;
	struct rdma_cm_event event;
	int ret;

	id_priv = mc->id_priv;
	if (cma_disable_callback(id_priv, RDMA_CM_ADDR_BOUND) &&
	    cma_disable_callback(id_priv, RDMA_CM_ADDR_RESOLVED))
		return 0;

	if (!status)
		status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
	mutex_lock(&id_priv->qp_mutex);
	if (!status && id_priv->id.qp)
		status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
					 be16_to_cpu(multicast->rec.mlid));
	mutex_unlock(&id_priv->qp_mutex);

	memset(&event, 0, sizeof event);
	event.status = status;
	event.param.ud.private_data = mc->context;
	if (!status) {
		event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
		ib_init_ah_from_mcmember(id_priv->id.device,
					 id_priv->id.port_num, &multicast->rec,
					 &event.param.ud.ah_attr);
		event.param.ud.qp_num = 0xFFFFFF;
		event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
	} else
		event.event = RDMA_CM_EVENT_MULTICAST_ERROR;

	ret = id_priv->id.event_handler(&id_priv->id, &event);
	if (ret) {
		cma_exch(id_priv, RDMA_CM_DESTROYING);
		mutex_unlock(&id_priv->handler_mutex);
		rdma_destroy_id(&id_priv->id);
		return 0;
	}

	mutex_unlock(&id_priv->handler_mutex);
	return 0;
}

static void cma_set_mgid(struct rdma_id_private *id_priv,
			 struct sockaddr *addr, union ib_gid *mgid)
{
	unsigned char mc_map[MAX_ADDR_LEN];
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	struct sockaddr_in *sin = (struct sockaddr_in *) addr;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;

	if (cma_any_addr(addr)) {
		memset(mgid, 0, sizeof *mgid);
	} else if ((addr->sa_family == AF_INET6) &&
		   ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
								 0xFF10A01B)) {
		/* IPv6 address is an SA assigned MGID. */
		memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
	} else if (addr->sa_family == AF_IB) {
		memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
	} else if ((addr->sa_family == AF_INET6)) {
		ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
		if (id_priv->id.ps == RDMA_PS_UDP)
			mc_map[7] = 0x01;	/* Use RDMA CM signature */
		*mgid = *(union ib_gid *) (mc_map + 4);
	} else {
		ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
		if (id_priv->id.ps == RDMA_PS_UDP)
			mc_map[7] = 0x01;	/* Use RDMA CM signature */
		*mgid = *(union ib_gid *) (mc_map + 4);
	}
}

static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
				 struct cma_multicast *mc)
{
	struct ib_sa_mcmember_rec rec;
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	ib_sa_comp_mask comp_mask;
	int ret;

	ib_addr_get_mgid(dev_addr, &rec.mgid);
	ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
				     &rec.mgid, &rec);
	if (ret)
		return ret;

	ret = cma_set_qkey(id_priv, 0);
	if (ret)
		return ret;

	cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
	rec.qkey = cpu_to_be32(id_priv->qkey);
	rdma_addr_get_sgid(dev_addr, &rec.port_gid);
	rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
	rec.join_state = 1;

	comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
		    IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
		    IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
		    IB_SA_MCMEMBER_REC_FLOW_LABEL |
		    IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;

	if (id_priv->id.ps == RDMA_PS_IPOIB)
		comp_mask |= IB_SA_MCMEMBER_REC_RATE |
			     IB_SA_MCMEMBER_REC_RATE_SELECTOR |
			     IB_SA_MCMEMBER_REC_MTU_SELECTOR |
			     IB_SA_MCMEMBER_REC_MTU |
			     IB_SA_MCMEMBER_REC_HOP_LIMIT;

	mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
						id_priv->id.port_num, &rec,
						comp_mask, GFP_KERNEL,
						cma_ib_mc_handler, mc);
	return PTR_ERR_OR_ZERO(mc->multicast.ib);
}

static void iboe_mcast_work_handler(struct work_struct *work)
{
	struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
	struct cma_multicast *mc = mw->mc;
	struct ib_sa_multicast *m = mc->multicast.ib;

	mc->multicast.ib->context = mc;
	cma_ib_mc_handler(0, m);
	kref_put(&mc->mcref, release_mc);
	kfree(mw);
}

static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
{
	struct sockaddr_in *sin = (struct sockaddr_in *)addr;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;

	if (cma_any_addr(addr)) {
		memset(mgid, 0, sizeof *mgid);
	} else if (addr->sa_family == AF_INET6) {
		memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
	} else {
		mgid->raw[0] = 0xff;
		mgid->raw[1] = 0x0e;
		mgid->raw[2] = 0;
		mgid->raw[3] = 0;
		mgid->raw[4] = 0;
		mgid->raw[5] = 0;
		mgid->raw[6] = 0;
		mgid->raw[7] = 0;
		mgid->raw[8] = 0;
		mgid->raw[9] = 0;
		mgid->raw[10] = 0xff;
		mgid->raw[11] = 0xff;
		*(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
	}
}

static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
				   struct cma_multicast *mc)
{
	struct iboe_mcast_work *work;
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	int err;
	struct sockaddr *addr = (struct sockaddr *)&mc->addr;
	struct net_device *ndev = NULL;

	if (cma_zero_addr((struct sockaddr *)&mc->addr))
		return -EINVAL;

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

	mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
	if (!mc->multicast.ib) {
		err = -ENOMEM;
		goto out1;
	}

	cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);

	mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
	if (id_priv->id.ps == RDMA_PS_UDP)
		mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);

	if (dev_addr->bound_dev_if)
		ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
	if (!ndev) {
		err = -ENODEV;
		goto out2;
	}
	mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
	mc->multicast.ib->rec.hop_limit = 1;
	mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
	dev_put(ndev);
	if (!mc->multicast.ib->rec.mtu) {
		err = -EINVAL;
		goto out2;
	}
	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
		    &mc->multicast.ib->rec.port_gid);
	work->id = id_priv;
	work->mc = mc;
	INIT_WORK(&work->work, iboe_mcast_work_handler);
	kref_get(&mc->mcref);
	queue_work(cma_wq, &work->work);

	return 0;

out2:
	kfree(mc->multicast.ib);
out1:
	kfree(work);
	return err;
}

int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
			void *context)
{
	struct rdma_id_private *id_priv;
	struct cma_multicast *mc;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
	    !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
		return -EINVAL;

	mc = kmalloc(sizeof *mc, GFP_KERNEL);
	if (!mc)
		return -ENOMEM;

	memcpy(&mc->addr, addr, rdma_addr_size(addr));
	mc->context = context;
	mc->id_priv = id_priv;

	spin_lock(&id_priv->lock);
	list_add(&mc->list, &id_priv->mc_list);
	spin_unlock(&id_priv->lock);

	if (rdma_protocol_roce(id->device, id->port_num)) {
		kref_init(&mc->mcref);
		ret = cma_iboe_join_multicast(id_priv, mc);
	} else if (rdma_cap_ib_mcast(id->device, id->port_num))
		ret = cma_join_ib_multicast(id_priv, mc);
	else
		ret = -ENOSYS;

	if (ret) {
		spin_lock_irq(&id_priv->lock);
		list_del(&mc->list);
		spin_unlock_irq(&id_priv->lock);
		kfree(mc);
	}
	return ret;
}
EXPORT_SYMBOL(rdma_join_multicast);

void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
{
	struct rdma_id_private *id_priv;
	struct cma_multicast *mc;

	id_priv = container_of(id, struct rdma_id_private, id);
	spin_lock_irq(&id_priv->lock);
	list_for_each_entry(mc, &id_priv->mc_list, list) {
		if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
			list_del(&mc->list);
			spin_unlock_irq(&id_priv->lock);

			if (id->qp)
				ib_detach_mcast(id->qp,
						&mc->multicast.ib->rec.mgid,
						be16_to_cpu(mc->multicast.ib->rec.mlid));

			BUG_ON(id_priv->cma_dev->device != id->device);

			if (rdma_cap_ib_mcast(id->device, id->port_num)) {
				ib_sa_free_multicast(mc->multicast.ib);
				kfree(mc);
			} else if (rdma_protocol_roce(id->device, id->port_num))
				kref_put(&mc->mcref, release_mc);

			return;
		}
	}
	spin_unlock_irq(&id_priv->lock);
}
EXPORT_SYMBOL(rdma_leave_multicast);

static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
{
	struct rdma_dev_addr *dev_addr;
	struct cma_ndev_work *work;

	dev_addr = &id_priv->id.route.addr.dev_addr;

	if ((dev_addr->bound_dev_if == ndev->ifindex) &&
	    memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
		printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
		       ndev->name, &id_priv->id);
		work = kzalloc(sizeof *work, GFP_KERNEL);
		if (!work)
			return -ENOMEM;

		INIT_WORK(&work->work, cma_ndev_work_handler);
		work->id = id_priv;
		work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
		atomic_inc(&id_priv->refcount);
		queue_work(cma_wq, &work->work);
	}

	return 0;
}

static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
			       void *ptr)
{
	struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
	struct cma_device *cma_dev;
	struct rdma_id_private *id_priv;
	int ret = NOTIFY_DONE;

	if (dev_net(ndev) != &init_net)
		return NOTIFY_DONE;

	if (event != NETDEV_BONDING_FAILOVER)
		return NOTIFY_DONE;

	if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
		return NOTIFY_DONE;

	mutex_lock(&lock);
	list_for_each_entry(cma_dev, &dev_list, list)
		list_for_each_entry(id_priv, &cma_dev->id_list, list) {
			ret = cma_netdev_change(ndev, id_priv);
			if (ret)
				goto out;
		}

out:
	mutex_unlock(&lock);
	return ret;
}

static struct notifier_block cma_nb = {
	.notifier_call = cma_netdev_callback
};

static void cma_add_one(struct ib_device *device)
{
	struct cma_device *cma_dev;
	struct rdma_id_private *id_priv;

	cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
	if (!cma_dev)
		return;

	cma_dev->device = device;

	init_completion(&cma_dev->comp);
	atomic_set(&cma_dev->refcount, 1);
	INIT_LIST_HEAD(&cma_dev->id_list);
	ib_set_client_data(device, &cma_client, cma_dev);

	mutex_lock(&lock);
	list_add_tail(&cma_dev->list, &dev_list);
	list_for_each_entry(id_priv, &listen_any_list, list)
		cma_listen_on_dev(id_priv, cma_dev);
	mutex_unlock(&lock);
}

static int cma_remove_id_dev(struct rdma_id_private *id_priv)
{
	struct rdma_cm_event event;
	enum rdma_cm_state state;
	int ret = 0;

	/* Record that we want to remove the device */
	state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
	if (state == RDMA_CM_DESTROYING)
		return 0;

	cma_cancel_operation(id_priv, state);
	mutex_lock(&id_priv->handler_mutex);

	/* Check for destruction from another callback. */
	if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
		goto out;

	memset(&event, 0, sizeof event);
	event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
	ret = id_priv->id.event_handler(&id_priv->id, &event);
out:
	mutex_unlock(&id_priv->handler_mutex);
	return ret;
}

static void cma_process_remove(struct cma_device *cma_dev)
{
	struct rdma_id_private *id_priv;
	int ret;

	mutex_lock(&lock);
	while (!list_empty(&cma_dev->id_list)) {
		id_priv = list_entry(cma_dev->id_list.next,
				     struct rdma_id_private, list);

		list_del(&id_priv->listen_list);
		list_del_init(&id_priv->list);
		atomic_inc(&id_priv->refcount);
		mutex_unlock(&lock);

		ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
		cma_deref_id(id_priv);
		if (ret)
			rdma_destroy_id(&id_priv->id);

		mutex_lock(&lock);
	}
	mutex_unlock(&lock);

	cma_deref_dev(cma_dev);
	wait_for_completion(&cma_dev->comp);
}

static void cma_remove_one(struct ib_device *device)
{
	struct cma_device *cma_dev;

	cma_dev = ib_get_client_data(device, &cma_client);
	if (!cma_dev)
		return;

	mutex_lock(&lock);
	list_del(&cma_dev->list);
	mutex_unlock(&lock);

	cma_process_remove(cma_dev);
	kfree(cma_dev);
}

static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct nlmsghdr *nlh;
	struct rdma_cm_id_stats *id_stats;
	struct rdma_id_private *id_priv;
	struct rdma_cm_id *id = NULL;
	struct cma_device *cma_dev;
	int i_dev = 0, i_id = 0;

	/*
	 * We export all of the IDs as a sequence of messages.  Each
	 * ID gets its own netlink message.
	 */
	mutex_lock(&lock);

	list_for_each_entry(cma_dev, &dev_list, list) {
		if (i_dev < cb->args[0]) {
			i_dev++;
			continue;
		}

		i_id = 0;
		list_for_each_entry(id_priv, &cma_dev->id_list, list) {
			if (i_id < cb->args[1]) {
				i_id++;
				continue;
			}

			id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
						sizeof *id_stats, RDMA_NL_RDMA_CM,
						RDMA_NL_RDMA_CM_ID_STATS,
						NLM_F_MULTI);
			if (!id_stats)
				goto out;

			memset(id_stats, 0, sizeof *id_stats);
			id = &id_priv->id;
			id_stats->node_type = id->route.addr.dev_addr.dev_type;
			id_stats->port_num = id->port_num;
			id_stats->bound_dev_if =
				id->route.addr.dev_addr.bound_dev_if;

			if (ibnl_put_attr(skb, nlh,
					  rdma_addr_size(cma_src_addr(id_priv)),
					  cma_src_addr(id_priv),
					  RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
				goto out;
			if (ibnl_put_attr(skb, nlh,
					  rdma_addr_size(cma_src_addr(id_priv)),
					  cma_dst_addr(id_priv),
					  RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
				goto out;

			id_stats->pid		= id_priv->owner;
			id_stats->port_space	= id->ps;
			id_stats->cm_state	= id_priv->state;
			id_stats->qp_num	= id_priv->qp_num;
			id_stats->qp_type	= id->qp_type;

			i_id++;
		}

		cb->args[1] = 0;
		i_dev++;
	}

out:
	mutex_unlock(&lock);
	cb->args[0] = i_dev;
	cb->args[1] = i_id;

	return skb->len;
}

static const struct ibnl_client_cbs cma_cb_table[] = {
	[RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
				       .module = THIS_MODULE },
};

static int __init cma_init(void)
{
	int ret;

	cma_wq = create_singlethread_workqueue("rdma_cm");
	if (!cma_wq)
		return -ENOMEM;

	ib_sa_register_client(&sa_client);
	rdma_addr_register_client(&addr_client);
	register_netdevice_notifier(&cma_nb);

	ret = ib_register_client(&cma_client);
	if (ret)
		goto err;

	if (ibnl_add_client(RDMA_NL_RDMA_CM, RDMA_NL_RDMA_CM_NUM_OPS, cma_cb_table))
		printk(KERN_WARNING "RDMA CMA: failed to add netlink callback\n");

	return 0;

err:
	unregister_netdevice_notifier(&cma_nb);
	rdma_addr_unregister_client(&addr_client);
	ib_sa_unregister_client(&sa_client);
	destroy_workqueue(cma_wq);
	return ret;
}

static void __exit cma_cleanup(void)
{
	ibnl_remove_client(RDMA_NL_RDMA_CM);
	ib_unregister_client(&cma_client);
	unregister_netdevice_notifier(&cma_nb);
	rdma_addr_unregister_client(&addr_client);
	ib_sa_unregister_client(&sa_client);
	destroy_workqueue(cma_wq);
	idr_destroy(&tcp_ps);
	idr_destroy(&udp_ps);
	idr_destroy(&ipoib_ps);
	idr_destroy(&ib_ps);
}

module_init(cma_init);
module_exit(cma_cleanup);