drivers/infiniband/core/cma.c

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
 * Copyright (c) 1999-2019, Mellanox Technologies, Inc. All rights reserved.
 * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
 */

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

#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/tcp.h>
#include <net/ipv6.h>
#include <net/ip_fib.h>
#include <net/ip6_route.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>

#include "core_priv.h"
#include "cma_priv.h"
#include "cma_trace.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
#define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP

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",
};

static void cma_set_mgid(struct rdma_id_private *id_priv, struct sockaddr *addr,
			 union ib_gid *mgid);

const char *__attribute_const__ 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);

const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
						int reason)
{
	if (rdma_ib_or_roce(id->device, id->port_num))
		return ibcm_reject_msg(reason);

	if (rdma_protocol_iwarp(id->device, id->port_num))
		return iwcm_reject_msg(reason);

	WARN_ON_ONCE(1);
	return "unrecognized transport";
}
EXPORT_SYMBOL(rdma_reject_msg);

/**
 * rdma_is_consumer_reject - return true if the consumer rejected the connect
 *                           request.
 * @id: Communication identifier that received the REJECT event.
 * @reason: Value returned in the REJECT event status field.
 */
static bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
{
	if (rdma_ib_or_roce(id->device, id->port_num))
		return reason == IB_CM_REJ_CONSUMER_DEFINED;

	if (rdma_protocol_iwarp(id->device, id->port_num))
		return reason == -ECONNREFUSED;

	WARN_ON_ONCE(1);
	return false;
}

const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
				      struct rdma_cm_event *ev, u8 *data_len)
{
	const void *p;

	if (rdma_is_consumer_reject(id, ev->status)) {
		*data_len = ev->param.conn.private_data_len;
		p = ev->param.conn.private_data;
	} else {
		*data_len = 0;
		p = NULL;
	}
	return p;
}
EXPORT_SYMBOL(rdma_consumer_reject_data);

/**
 * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
 * @id: Communication Identifier
 */
struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
{
	struct rdma_id_private *id_priv;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (id->device->node_type == RDMA_NODE_RNIC)
		return id_priv->cm_id.iw;
	return NULL;
}
EXPORT_SYMBOL(rdma_iw_cm_id);

/**
 * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
 * @res: rdma resource tracking entry pointer
 */
struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
{
	struct rdma_id_private *id_priv =
		container_of(res, struct rdma_id_private, res);

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

static int cma_add_one(struct ib_device *device);
static void cma_remove_one(struct ib_device *device, void *client_data);

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

static struct ib_sa_client sa_client;
static LIST_HEAD(dev_list);
static LIST_HEAD(listen_any_list);
static DEFINE_MUTEX(lock);
static struct workqueue_struct *cma_wq;
static unsigned int cma_pernet_id;

struct cma_pernet {
	struct xarray tcp_ps;
	struct xarray udp_ps;
	struct xarray ipoib_ps;
	struct xarray ib_ps;
};

static struct cma_pernet *cma_pernet(struct net *net)
{
	return net_generic(net, cma_pernet_id);
}

static
struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
{
	struct cma_pernet *pernet = cma_pernet(net);

	switch (ps) {
	case RDMA_PS_TCP:
		return &pernet->tcp_ps;
	case RDMA_PS_UDP:
		return &pernet->udp_ps;
	case RDMA_PS_IPOIB:
		return &pernet->ipoib_ps;
	case RDMA_PS_IB:
		return &pernet->ib_ps;
	default:
		return NULL;
	}
}

struct cma_device {
	struct list_head	list;
	struct ib_device	*device;
	struct completion	comp;
	refcount_t refcount;
	struct list_head	id_list;
	enum ib_gid_type	*default_gid_type;
	u8			*default_roce_tos;
};

struct rdma_bind_list {
	enum rdma_ucm_port_space ps;
	struct hlist_head	owners;
	unsigned short		port;
};

static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
			struct rdma_bind_list *bind_list, int snum)
{
	struct xarray *xa = cma_pernet_xa(net, ps);

	return xa_insert(xa, snum, bind_list, GFP_KERNEL);
}

static struct rdma_bind_list *cma_ps_find(struct net *net,
					  enum rdma_ucm_port_space ps, int snum)
{
	struct xarray *xa = cma_pernet_xa(net, ps);

	return xa_load(xa, snum);
}

static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
			  int snum)
{
	struct xarray *xa = cma_pernet_xa(net, ps);

	xa_erase(xa, snum);
}

enum {
	CMA_OPTION_AFONLY,
};

void cma_dev_get(struct cma_device *cma_dev)
{
	refcount_inc(&cma_dev->refcount);
}

void cma_dev_put(struct cma_device *cma_dev)
{
	if (refcount_dec_and_test(&cma_dev->refcount))
		complete(&cma_dev->comp);
}

struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter	filter,
					     void		*cookie)
{
	struct cma_device *cma_dev;
	struct cma_device *found_cma_dev = NULL;

	mutex_lock(&lock);

	list_for_each_entry(cma_dev, &dev_list, list)
		if (filter(cma_dev->device, cookie)) {
			found_cma_dev = cma_dev;
			break;
		}

	if (found_cma_dev)
		cma_dev_get(found_cma_dev);
	mutex_unlock(&lock);
	return found_cma_dev;
}

int cma_get_default_gid_type(struct cma_device *cma_dev,
			     u32 port)
{
	if (!rdma_is_port_valid(cma_dev->device, port))
		return -EINVAL;

	return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
}

int cma_set_default_gid_type(struct cma_device *cma_dev,
			     u32 port,
			     enum ib_gid_type default_gid_type)
{
	unsigned long supported_gids;

	if (!rdma_is_port_valid(cma_dev->device, port))
		return -EINVAL;

	if (default_gid_type == IB_GID_TYPE_IB &&
	    rdma_protocol_roce_eth_encap(cma_dev->device, port))
		default_gid_type = IB_GID_TYPE_ROCE;

	supported_gids = roce_gid_type_mask_support(cma_dev->device, port);

	if (!(supported_gids & 1 << default_gid_type))
		return -EINVAL;

	cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
		default_gid_type;

	return 0;
}

int cma_get_default_roce_tos(struct cma_device *cma_dev, u32 port)
{
	if (!rdma_is_port_valid(cma_dev->device, port))
		return -EINVAL;

	return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
}

int cma_set_default_roce_tos(struct cma_device *cma_dev, u32 port,
			     u8 default_roce_tos)
{
	if (!rdma_is_port_valid(cma_dev->device, port))
		return -EINVAL;

	cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
		 default_roce_tos;

	return 0;
}
struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
{
	return cma_dev->device;
}

/*
 * 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 cma_multicast {
	struct rdma_id_private *id_priv;
	union {
		struct ib_sa_multicast *sa_mc;
		struct {
			struct work_struct work;
			struct rdma_cm_event event;
		} iboe_join;
	};
	struct list_head	list;
	void			*context;
	struct sockaddr_storage	addr;
	u8			join_state;
};

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;
};

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

struct cma_req_info {
	struct sockaddr_storage listen_addr_storage;
	struct sockaddr_storage src_addr_storage;
	struct ib_device *device;
	union ib_gid local_gid;
	__be64 service_id;
	int port;
	bool has_gid;
	u16 pkey;
};

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;

	/*
	 * The FSM uses a funny double locking where state is protected by both
	 * the handler_mutex and the spinlock. State is not allowed to change
	 * to/from a handler_mutex protected value without also holding
	 * handler_mutex.
	 */
	if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT)
		lockdep_assert_held(&id_priv->handler_mutex);

	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 inline u8 cma_get_ip_ver(const 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 int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
{
	struct in_device *in_dev = NULL;

	if (ndev) {
		rtnl_lock();
		in_dev = __in_dev_get_rtnl(ndev);
		if (in_dev) {
			if (join)
				ip_mc_inc_group(in_dev,
						*(__be32 *)(mgid->raw + 12));
			else
				ip_mc_dec_group(in_dev,
						*(__be32 *)(mgid->raw + 12));
		}
		rtnl_unlock();
	}
	return (in_dev) ? 0 : -ENODEV;
}

static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
			       struct cma_device *cma_dev)
{
	cma_dev_get(cma_dev);
	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->device_item, &cma_dev->id_list);

	trace_cm_id_attach(id_priv, cma_dev->device);
}

static void cma_attach_to_dev(struct rdma_id_private *id_priv,
			      struct cma_device *cma_dev)
{
	_cma_attach_to_dev(id_priv, cma_dev);
	id_priv->gid_type =
		cma_dev->default_gid_type[id_priv->id.port_num -
					  rdma_start_port(cma_dev->device)];
}

static void cma_release_dev(struct rdma_id_private *id_priv)
{
	mutex_lock(&lock);
	list_del_init(&id_priv->device_item);
	cma_dev_put(id_priv->cma_dev);
	id_priv->cma_dev = NULL;
	id_priv->id.device = NULL;
	if (id_priv->id.route.addr.dev_addr.sgid_attr) {
		rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
		id_priv->id.route.addr.dev_addr.sgid_attr = 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);
	} else {
		cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
		ret = 0;
	}

	return ret;
}

static const struct ib_gid_attr *
cma_validate_port(struct ib_device *device, u32 port,
		  enum ib_gid_type gid_type,
		  union ib_gid *gid,
		  struct rdma_id_private *id_priv)
{
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	int bound_if_index = dev_addr->bound_dev_if;
	const struct ib_gid_attr *sgid_attr;
	int dev_type = dev_addr->dev_type;
	struct net_device *ndev = NULL;

	if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
		return ERR_PTR(-ENODEV);

	if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
		return ERR_PTR(-ENODEV);

	if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
		return ERR_PTR(-ENODEV);

	if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
		ndev = dev_get_by_index(dev_addr->net, bound_if_index);
		if (!ndev)
			return ERR_PTR(-ENODEV);
	} else {
		gid_type = IB_GID_TYPE_IB;
	}

	sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
	if (ndev)
		dev_put(ndev);
	return sgid_attr;
}

static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
			       const struct ib_gid_attr *sgid_attr)
{
	WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
	id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
}

/**
 * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
 * based on source ip address.
 * @id_priv:	cm_id which should be bound to cma device
 *
 * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
 * based on source IP address. It returns 0 on success or error code otherwise.
 * It is applicable to active and passive side cm_id.
 */
static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
{
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	const struct ib_gid_attr *sgid_attr;
	union ib_gid gid, iboe_gid, *gidp;
	struct cma_device *cma_dev;
	enum ib_gid_type gid_type;
	int ret = -ENODEV;
	u32 port;

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

	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));

	mutex_lock(&lock);
	list_for_each_entry(cma_dev, &dev_list, list) {
		rdma_for_each_port (cma_dev->device, port) {
			gidp = rdma_protocol_roce(cma_dev->device, port) ?
			       &iboe_gid : &gid;
			gid_type = cma_dev->default_gid_type[port - 1];
			sgid_attr = cma_validate_port(cma_dev->device, port,
						      gid_type, gidp, id_priv);
			if (!IS_ERR(sgid_attr)) {
				id_priv->id.port_num = port;
				cma_bind_sgid_attr(id_priv, sgid_attr);
				cma_attach_to_dev(id_priv, cma_dev);
				ret = 0;
				goto out;
			}
		}
	}
out:
	mutex_unlock(&lock);
	return ret;
}

/**
 * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
 * @id_priv:		cm id to bind to cma device
 * @listen_id_priv:	listener cm id to match against
 * @req:		Pointer to req structure containaining incoming
 *			request information
 * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
 * rdma device matches for listen_id and incoming request. It also verifies
 * that a GID table entry is present for the source address.
 * Returns 0 on success, or returns error code otherwise.
 */
static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
			      const struct rdma_id_private *listen_id_priv,
			      struct cma_req_info *req)
{
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	const struct ib_gid_attr *sgid_attr;
	enum ib_gid_type gid_type;
	union ib_gid gid;

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

	if (rdma_protocol_roce(req->device, req->port))
		rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
			    &gid);
	else
		memcpy(&gid, dev_addr->src_dev_addr +
		       rdma_addr_gid_offset(dev_addr), sizeof(gid));

	gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
	sgid_attr = cma_validate_port(req->device, req->port,
				      gid_type, &gid, id_priv);
	if (IS_ERR(sgid_attr))
		return PTR_ERR(sgid_attr);

	id_priv->id.port_num = req->port;
	cma_bind_sgid_attr(id_priv, sgid_attr);
	/* Need to acquire lock to protect against reader
	 * of cma_dev->id_list such as cma_netdev_callback() and
	 * cma_process_remove().
	 */
	mutex_lock(&lock);
	cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
	mutex_unlock(&lock);
	rdma_restrack_add(&id_priv->res);
	return 0;
}

static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
			      const struct rdma_id_private *listen_id_priv)
{
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	const struct ib_gid_attr *sgid_attr;
	struct cma_device *cma_dev;
	enum ib_gid_type gid_type;
	int ret = -ENODEV;
	union ib_gid gid;
	u32 port;

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

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

	mutex_lock(&lock);

	cma_dev = listen_id_priv->cma_dev;
	port = listen_id_priv->id.port_num;
	gid_type = listen_id_priv->gid_type;
	sgid_attr = cma_validate_port(cma_dev->device, port,
				      gid_type, &gid, id_priv);
	if (!IS_ERR(sgid_attr)) {
		id_priv->id.port_num = port;
		cma_bind_sgid_attr(id_priv, sgid_attr);
		ret = 0;
		goto out;
	}

	list_for_each_entry(cma_dev, &dev_list, list) {
		rdma_for_each_port (cma_dev->device, port) {
			if (listen_id_priv->cma_dev == cma_dev &&
			    listen_id_priv->id.port_num == port)
				continue;

			gid_type = cma_dev->default_gid_type[port - 1];
			sgid_attr = cma_validate_port(cma_dev->device, port,
						      gid_type, &gid, id_priv);
			if (!IS_ERR(sgid_attr)) {
				id_priv->id.port_num = port;
				cma_bind_sgid_attr(id_priv, sgid_attr);
				ret = 0;
				goto out;
			}
		}
	}

out:
	if (!ret) {
		cma_attach_to_dev(id_priv, cma_dev);
		rdma_restrack_add(&id_priv->res);
	}

	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;
	unsigned int p;
	u16 pkey, index;
	enum ib_port_state port_state;
	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);

	mutex_lock(&lock);
	list_for_each_entry(cur_dev, &dev_list, list) {
		rdma_for_each_port (cur_dev->device, p) {
			if (!rdma_cap_af_ib(cur_dev->device, p))
				continue;

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

			if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
				continue;
			for (i = 0; !rdma_query_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) &&
				    port_state == IB_PORT_ACTIVE) {
					cma_dev = cur_dev;
					sgid = gid;
					id_priv->id.port_num = p;
					goto found;
				}
			}
		}
	}
	mutex_unlock(&lock);
	return -ENODEV;

found:
	cma_attach_to_dev(id_priv, cma_dev);
	rdma_restrack_add(&id_priv->res);
	mutex_unlock(&lock);
	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_id_get(struct rdma_id_private *id_priv)
{
	refcount_inc(&id_priv->refcount);
}

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

static struct rdma_id_private *
__rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
		 void *context, enum rdma_ucm_port_space ps,
		 enum ib_qp_type qp_type, const struct rdma_id_private *parent)
{
	struct rdma_id_private *id_priv;

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

	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;
	id_priv->tos_set = false;
	id_priv->timeout_set = false;
	id_priv->min_rnr_timer_set = false;
	id_priv->gid_type = IB_GID_TYPE_IB;
	spin_lock_init(&id_priv->lock);
	mutex_init(&id_priv->qp_mutex);
	init_completion(&id_priv->comp);
	refcount_set(&id_priv->refcount, 1);
	mutex_init(&id_priv->handler_mutex);
	INIT_LIST_HEAD(&id_priv->device_item);
	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);
	id_priv->id.route.addr.dev_addr.net = get_net(net);
	id_priv->seq_num &= 0x00ffffff;

	rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID);
	if (parent)
		rdma_restrack_parent_name(&id_priv->res, &parent->res);

	return id_priv;
}

struct rdma_cm_id *
__rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
			void *context, enum rdma_ucm_port_space ps,
			enum ib_qp_type qp_type, const char *caller)
{
	struct rdma_id_private *ret;

	ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL);
	if (IS_ERR(ret))
		return ERR_CAST(ret);

	rdma_restrack_set_name(&ret->res, caller);
	return &ret->id;
}
EXPORT_SYMBOL(__rdma_create_kernel_id);

struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
				       void *context,
				       enum rdma_ucm_port_space ps,
				       enum ib_qp_type qp_type)
{
	struct rdma_id_private *ret;

	ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context,
			       ps, qp_type, NULL);
	if (IS_ERR(ret))
		return ERR_CAST(ret);

	rdma_restrack_set_name(&ret->res, NULL);
	return &ret->id;
}
EXPORT_SYMBOL(rdma_create_user_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) {
		ret = -EINVAL;
		goto out_err;
	}

	qp_init_attr->port_num = id->port_num;
	qp = ib_create_qp(pd, qp_init_attr);
	if (IS_ERR(qp)) {
		ret = PTR_ERR(qp);
		goto out_err;
	}

	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 out_destroy;

	id->qp = qp;
	id_priv->qp_num = qp->qp_num;
	id_priv->srq = (qp->srq != NULL);
	trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
	return 0;
out_destroy:
	ib_destroy_qp(qp);
out_err:
	trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
	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);
	trace_cm_qp_destroy(id_priv);
	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;

	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;

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

	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);
		qp_attr->port_num = id_priv->id.port_num;
		*qp_attr_mask |= IB_QP_PORT;
	} else {
		ret = -ENOSYS;
	}

	if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
		qp_attr->timeout = id_priv->timeout;

	if ((*qp_attr_mask & IB_QP_MIN_RNR_TIMER) && id_priv->min_rnr_timer_set)
		qp_attr->min_rnr_timer = id_priv->min_rnr_timer;

	return ret;
}
EXPORT_SYMBOL(rdma_init_qp_attr);

static inline bool cma_zero_addr(const 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 false;
	}
}

static inline bool cma_loopback_addr(const 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 false;
	}
}

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

static int cma_addr_cmp(const struct sockaddr *src, const 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: {
		struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
		struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
		bool link_local;

		if (ipv6_addr_cmp(&src_addr6->sin6_addr,
					  &dst_addr6->sin6_addr))
			return 1;
		link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
			     IPV6_ADDR_LINKLOCAL;
		/* Link local must match their scope_ids */
		return link_local ? (src_addr6->sin6_scope_id !=
				     dst_addr6->sin6_scope_id) :
				    0;
	}

	default:
		return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
				   &((struct sockaddr_ib *) dst)->sib_addr);
	}
}

static __be16 cma_port(const 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(const struct sockaddr *addr)
{
	return !cma_port(addr);
}

static void cma_save_ib_info(struct sockaddr *src_addr,
			     struct sockaddr *dst_addr,
			     const struct rdma_cm_id *listen_id,
			     const struct sa_path_rec *path)
{
	struct sockaddr_ib *listen_ib, *ib;

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

static void cma_save_ip4_info(struct sockaddr_in *src_addr,
			      struct sockaddr_in *dst_addr,
			      struct cma_hdr *hdr,
			      __be16 local_port)
{
	if (src_addr) {
		*src_addr = (struct sockaddr_in) {
			.sin_family = AF_INET,
			.sin_addr.s_addr = hdr->dst_addr.ip4.addr,
			.sin_port = local_port,
		};
	}

	if (dst_addr) {
		*dst_addr = (struct sockaddr_in) {
			.sin_family = AF_INET,
			.sin_addr.s_addr = hdr->src_addr.ip4.addr,
			.sin_port = hdr->port,
		};
	}
}

static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
			      struct sockaddr_in6 *dst_addr,
			      struct cma_hdr *hdr,
			      __be16 local_port)
{
	if (src_addr) {
		*src_addr = (struct sockaddr_in6) {
			.sin6_family = AF_INET6,
			.sin6_addr = hdr->dst_addr.ip6,
			.sin6_port = local_port,
		};
	}

	if (dst_addr) {
		*dst_addr = (struct sockaddr_in6) {
			.sin6_family = AF_INET6,
			.sin6_addr = hdr->src_addr.ip6,
			.sin6_port = hdr->port,
		};
	}
}

static u16 cma_port_from_service_id(__be64 service_id)
{
	return (u16)be64_to_cpu(service_id);
}

static int cma_save_ip_info(struct sockaddr *src_addr,
			    struct sockaddr *dst_addr,
			    const struct ib_cm_event *ib_event,
			    __be64 service_id)
{
	struct cma_hdr *hdr;
	__be16 port;

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

	port = htons(cma_port_from_service_id(service_id));

	switch (cma_get_ip_ver(hdr)) {
	case 4:
		cma_save_ip4_info((struct sockaddr_in *)src_addr,
				  (struct sockaddr_in *)dst_addr, hdr, port);
		break;
	case 6:
		cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
				  (struct sockaddr_in6 *)dst_addr, hdr, port);
		break;
	default:
		return -EAFNOSUPPORT;
	}

	return 0;
}

static int cma_save_net_info(struct sockaddr *src_addr,
			     struct sockaddr *dst_addr,
			     const struct rdma_cm_id *listen_id,
			     const struct ib_cm_event *ib_event,
			     sa_family_t sa_family, __be64 service_id)
{
	if (sa_family == AF_IB) {
		if (ib_event->event == IB_CM_REQ_RECEIVED)
			cma_save_ib_info(src_addr, dst_addr, listen_id,
					 ib_event->param.req_rcvd.primary_path);
		else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
			cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
		return 0;
	}

	return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
}

static int cma_save_req_info(const struct ib_cm_event *ib_event,
			     struct cma_req_info *req)
{
	const struct ib_cm_req_event_param *req_param =
		&ib_event->param.req_rcvd;
	const struct ib_cm_sidr_req_event_param *sidr_param =
		&ib_event->param.sidr_req_rcvd;

	switch (ib_event->event) {
	case IB_CM_REQ_RECEIVED:
		req->device	= req_param->listen_id->device;
		req->port	= req_param->port;
		memcpy(&req->local_gid, &req_param->primary_path->sgid,
		       sizeof(req->local_gid));
		req->has_gid	= true;
		req->service_id = req_param->primary_path->service_id;
		req->pkey	= be16_to_cpu(req_param->primary_path->pkey);
		if (req->pkey != req_param->bth_pkey)
			pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
					    "RDMA CMA: in the future this may cause the request to be dropped\n",
					    req_param->bth_pkey, req->pkey);
		break;
	case IB_CM_SIDR_REQ_RECEIVED:
		req->device	= sidr_param->listen_id->device;
		req->port	= sidr_param->port;
		req->has_gid	= false;
		req->service_id	= sidr_param->service_id;
		req->pkey	= sidr_param->pkey;
		if (req->pkey != sidr_param->bth_pkey)
			pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
					    "RDMA CMA: in the future this may cause the request to be dropped\n",
					    sidr_param->bth_pkey, req->pkey);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static bool validate_ipv4_net_dev(struct net_device *net_dev,
				  const struct sockaddr_in *dst_addr,
				  const struct sockaddr_in *src_addr)
{
	__be32 daddr = dst_addr->sin_addr.s_addr,
	       saddr = src_addr->sin_addr.s_addr;
	struct fib_result res;
	struct flowi4 fl4;
	int err;
	bool ret;

	if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
	    ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
	    ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
	    ipv4_is_loopback(saddr))
		return false;

	memset(&fl4, 0, sizeof(fl4));
	fl4.flowi4_iif = net_dev->ifindex;
	fl4.daddr = daddr;
	fl4.saddr = saddr;

	rcu_read_lock();
	err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
	ret = err == 0 && FIB_RES_DEV(res) == net_dev;
	rcu_read_unlock();

	return ret;
}

static bool validate_ipv6_net_dev(struct net_device *net_dev,
				  const struct sockaddr_in6 *dst_addr,
				  const struct sockaddr_in6 *src_addr)
{
#if IS_ENABLED(CONFIG_IPV6)
	const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
			   IPV6_ADDR_LINKLOCAL;
	struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
					 &src_addr->sin6_addr, net_dev->ifindex,
					 NULL, strict);
	bool ret;

	if (!rt)
		return false;

	ret = rt->rt6i_idev->dev == net_dev;
	ip6_rt_put(rt);

	return ret;
#else
	return false;
#endif
}

static bool validate_net_dev(struct net_device *net_dev,
			     const struct sockaddr *daddr,
			     const struct sockaddr *saddr)
{
	const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
	const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
	const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
	const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;

	switch (daddr->sa_family) {
	case AF_INET:
		return saddr->sa_family == AF_INET &&
		       validate_ipv4_net_dev(net_dev, daddr4, saddr4);

	case AF_INET6:
		return saddr->sa_family == AF_INET6 &&
		       validate_ipv6_net_dev(net_dev, daddr6, saddr6);

	default:
		return false;
	}
}

static struct net_device *
roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
{
	const struct ib_gid_attr *sgid_attr = NULL;
	struct net_device *ndev;

	if (ib_event->event == IB_CM_REQ_RECEIVED)
		sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
	else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
		sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;

	if (!sgid_attr)
		return NULL;

	rcu_read_lock();
	ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
	if (IS_ERR(ndev))
		ndev = NULL;
	else
		dev_hold(ndev);
	rcu_read_unlock();
	return ndev;
}

static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
					  struct cma_req_info *req)
{
	struct sockaddr *listen_addr =
			(struct sockaddr *)&req->listen_addr_storage;
	struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
	struct net_device *net_dev;
	const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
	int err;

	err = cma_save_ip_info(listen_addr, src_addr, ib_event,
			       req->service_id);
	if (err)
		return ERR_PTR(err);

	if (rdma_protocol_roce(req->device, req->port))
		net_dev = roce_get_net_dev_by_cm_event(ib_event);
	else
		net_dev = ib_get_net_dev_by_params(req->device, req->port,
						   req->pkey,
						   gid, listen_addr);
	if (!net_dev)
		return ERR_PTR(-ENODEV);

	return net_dev;
}

static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
{
	return (be64_to_cpu(service_id) >> 16) & 0xffff;
}

static bool cma_match_private_data(struct rdma_id_private *id_priv,
				   const struct cma_hdr *hdr)
{
	struct sockaddr *addr = cma_src_addr(id_priv);
	__be32 ip4_addr;
	struct in6_addr ip6_addr;

	if (cma_any_addr(addr) && !id_priv->afonly)
		return true;

	switch (addr->sa_family) {
	case AF_INET:
		ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
		if (cma_get_ip_ver(hdr) != 4)
			return false;
		if (!cma_any_addr(addr) &&
		    hdr->dst_addr.ip4.addr != ip4_addr)
			return false;
		break;
	case AF_INET6:
		ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
		if (cma_get_ip_ver(hdr) != 6)
			return false;
		if (!cma_any_addr(addr) &&
		    memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
			return false;
		break;
	case AF_IB:
		return true;
	default:
		return false;
	}

	return true;
}

static bool cma_protocol_roce(const struct rdma_cm_id *id)
{
	struct ib_device *device = id->device;
	const u32 port_num = id->port_num ?: rdma_start_port(device);

	return rdma_protocol_roce(device, port_num);
}

static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
{
	const struct sockaddr *daddr =
			(const struct sockaddr *)&req->listen_addr_storage;
	const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;

	/* Returns true if the req is for IPv6 link local */
	return (daddr->sa_family == AF_INET6 &&
		(ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
}

static bool cma_match_net_dev(const struct rdma_cm_id *id,
			      const struct net_device *net_dev,
			      const struct cma_req_info *req)
{
	const struct rdma_addr *addr = &id->route.addr;

	if (!net_dev)
		/* This request is an AF_IB request */
		return (!id->port_num || id->port_num == req->port) &&
		       (addr->src_addr.ss_family == AF_IB);

	/*
	 * If the request is not for IPv6 link local, allow matching
	 * request to any netdevice of the one or multiport rdma device.
	 */
	if (!cma_is_req_ipv6_ll(req))
		return true;
	/*
	 * Net namespaces must match, and if the listner is listening
	 * on a specific netdevice than netdevice must match as well.
	 */
	if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
	    (!!addr->dev_addr.bound_dev_if ==
	     (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
		return true;
	else
		return false;
}

static struct rdma_id_private *cma_find_listener(
		const struct rdma_bind_list *bind_list,
		const struct ib_cm_id *cm_id,
		const struct ib_cm_event *ib_event,
		const struct cma_req_info *req,
		const struct net_device *net_dev)
{
	struct rdma_id_private *id_priv, *id_priv_dev;

	lockdep_assert_held(&lock);

	if (!bind_list)
		return ERR_PTR(-EINVAL);

	hlist_for_each_entry(id_priv, &bind_list->owners, node) {
		if (cma_match_private_data(id_priv, ib_event->private_data)) {
			if (id_priv->id.device == cm_id->device &&
			    cma_match_net_dev(&id_priv->id, net_dev, req))
				return id_priv;
			list_for_each_entry(id_priv_dev,
					    &id_priv->listen_list,
					    listen_item) {
				if (id_priv_dev->id.device == cm_id->device &&
				    cma_match_net_dev(&id_priv_dev->id,
						      net_dev, req))
					return id_priv_dev;
			}
		}
	}

	return ERR_PTR(-EINVAL);
}

static struct rdma_id_private *
cma_ib_id_from_event(struct ib_cm_id *cm_id,
		     const struct ib_cm_event *ib_event,
		     struct cma_req_info *req,
		     struct net_device **net_dev)
{
	struct rdma_bind_list *bind_list;
	struct rdma_id_private *id_priv;
	int err;

	err = cma_save_req_info(ib_event, req);
	if (err)
		return ERR_PTR(err);

	*net_dev = cma_get_net_dev(ib_event, req);
	if (IS_ERR(*net_dev)) {
		if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
			/* Assuming the protocol is AF_IB */
			*net_dev = NULL;
		} else {
			return ERR_CAST(*net_dev);
		}
	}

	mutex_lock(&lock);
	/*
	 * Net namespace might be getting deleted while route lookup,
	 * cm_id lookup is in progress. Therefore, perform netdevice
	 * validation, cm_id lookup under rcu lock.
	 * RCU lock along with netdevice state check, synchronizes with
	 * netdevice migrating to different net namespace and also avoids
	 * case where net namespace doesn't get deleted while lookup is in
	 * progress.
	 * If the device state is not IFF_UP, its properties such as ifindex
	 * and nd_net cannot be trusted to remain valid without rcu lock.
	 * net/core/dev.c change_net_namespace() ensures to synchronize with
	 * ongoing operations on net device after device is closed using
	 * synchronize_net().
	 */
	rcu_read_lock();
	if (*net_dev) {
		/*
		 * If netdevice is down, it is likely that it is administratively
		 * down or it might be migrating to different namespace.
		 * In that case avoid further processing, as the net namespace
		 * or ifindex may change.
		 */
		if (((*net_dev)->flags & IFF_UP) == 0) {
			id_priv = ERR_PTR(-EHOSTUNREACH);
			goto err;
		}

		if (!validate_net_dev(*net_dev,
				 (struct sockaddr *)&req->listen_addr_storage,
				 (struct sockaddr *)&req->src_addr_storage)) {
			id_priv = ERR_PTR(-EHOSTUNREACH);
			goto err;
		}
	}

	bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
				rdma_ps_from_service_id(req->service_id),
				cma_port_from_service_id(req->service_id));
	id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
err:
	rcu_read_unlock();
	mutex_unlock(&lock);
	if (IS_ERR(id_priv) && *net_dev) {
		dev_put(*net_dev);
		*net_dev = NULL;
	}
	return id_priv;
}

static inline u8 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;

	lockdep_assert_held(&lock);

	/*
	 * Remove from listen_any_list to prevent added devices from spawning
	 * additional listen requests.
	 */
	list_del_init(&id_priv->listen_any_item);

	while (!list_empty(&id_priv->listen_list)) {
		dev_id_priv =
			list_first_entry(&id_priv->listen_list,
					 struct rdma_id_private, listen_item);
		/* sync with device removal to avoid duplicate destruction */
		list_del_init(&dev_id_priv->device_item);
		list_del_init(&dev_id_priv->listen_item);
		mutex_unlock(&lock);

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

static void cma_cancel_listens(struct rdma_id_private *id_priv)
{
	mutex_lock(&lock);
	_cma_cancel_listens(id_priv);
	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:
		/*
		 * We can avoid doing the rdma_addr_cancel() based on state,
		 * only RDMA_CM_ADDR_QUERY has a work that could still execute.
		 * Notice that the addr_handler work could still be exiting
		 * outside this state, however due to the interaction with the
		 * handler_mutex the work is guaranteed not to touch id_priv
		 * during exit.
		 */
		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;
	struct net *net = id_priv->id.route.addr.dev_addr.net;

	if (!bind_list)
		return;

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

static void destroy_mc(struct rdma_id_private *id_priv,
		       struct cma_multicast *mc)
{
	bool send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);

	if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
		ib_sa_free_multicast(mc->sa_mc);

	if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
		struct rdma_dev_addr *dev_addr =
			&id_priv->id.route.addr.dev_addr;
		struct net_device *ndev = NULL;

		if (dev_addr->bound_dev_if)
			ndev = dev_get_by_index(dev_addr->net,
						dev_addr->bound_dev_if);
		if (ndev) {
			union ib_gid mgid;

			cma_set_mgid(id_priv, (struct sockaddr *)&mc->addr,
				     &mgid);

			if (!send_only)
				cma_igmp_send(ndev, &mgid, false);

			dev_put(ndev);
		}

		cancel_work_sync(&mc->iboe_join.work);
	}
	kfree(mc);
}

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

	while (!list_empty(&id_priv->mc_list)) {
		mc = list_first_entry(&id_priv->mc_list, struct cma_multicast,
				      list);
		list_del(&mc->list);
		destroy_mc(id_priv, mc);
	}
}

static void _destroy_id(struct rdma_id_private *id_priv,
			enum rdma_cm_state state)
{
	cma_cancel_operation(id_priv, state);

	rdma_restrack_del(&id_priv->res);
	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_id_put(id_priv);
	wait_for_completion(&id_priv->comp);

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

	kfree(id_priv->id.route.path_rec);

	put_net(id_priv->id.route.addr.dev_addr.net);
	kfree(id_priv);
}

/*
 * destroy an ID from within the handler_mutex. This ensures that no other
 * handlers can start running concurrently.
 */
static void destroy_id_handler_unlock(struct rdma_id_private *id_priv)
	__releases(&idprv->handler_mutex)
{
	enum rdma_cm_state state;
	unsigned long flags;

	trace_cm_id_destroy(id_priv);

	/*
	 * Setting the state to destroyed under the handler mutex provides a
	 * fence against calling handler callbacks. If this is invoked due to
	 * the failure of a handler callback then it guarentees that no future
	 * handlers will be called.
	 */
	lockdep_assert_held(&id_priv->handler_mutex);
	spin_lock_irqsave(&id_priv->lock, flags);
	state = id_priv->state;
	id_priv->state = RDMA_CM_DESTROYING;
	spin_unlock_irqrestore(&id_priv->lock, flags);
	mutex_unlock(&id_priv->handler_mutex);
	_destroy_id(id_priv, state);
}

void rdma_destroy_id(struct rdma_cm_id *id)
{
	struct rdma_id_private *id_priv =
		container_of(id, struct rdma_id_private, id);

	mutex_lock(&id_priv->handler_mutex);
	destroy_id_handler_unlock(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;

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

	return 0;
reject:
	pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
	cma_modify_qp_err(id_priv);
	trace_cm_send_rej(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,
				   const 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;

	event->ece.vendor_id = rep_data->ece.vendor_id;
	event->ece.attr_mod = rep_data->ece.attr_mod;
}

static int cma_cm_event_handler(struct rdma_id_private *id_priv,
				struct rdma_cm_event *event)
{
	int ret;

	lockdep_assert_held(&id_priv->handler_mutex);

	trace_cm_event_handler(id_priv, event);
	ret = id_priv->id.event_handler(&id_priv->id, event);
	trace_cm_event_done(id_priv, event, ret);
	return ret;
}

static int cma_ib_handler(struct ib_cm_id *cm_id,
			  const struct ib_cm_event *ib_event)
{
	struct rdma_id_private *id_priv = cm_id->context;
	struct rdma_cm_event event = {};
	enum rdma_cm_state state;
	int ret;

	mutex_lock(&id_priv->handler_mutex);
	state = READ_ONCE(id_priv->state);
	if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
	     state != RDMA_CM_CONNECT) ||
	    (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
	     state != RDMA_CM_DISCONNECT))
		goto out;

	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 (state == RDMA_CM_CONNECT &&
		    (id_priv->id.qp_type != IB_QPT_UD)) {
			trace_cm_send_mra(id_priv);
			ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
		}
		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;
		fallthrough;
	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:
		pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
										ib_event->param.rej_rcvd.reason));
		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:
		pr_err("RDMA CMA: unexpected IB CM event: %d\n",
		       ib_event->event);
		goto out;
	}

	ret = cma_cm_event_handler(id_priv, &event);
	if (ret) {
		/* Destroy the CM ID by returning a non-zero value. */
		id_priv->cm_id.ib = NULL;
		destroy_id_handler_unlock(id_priv);
		return ret;
	}
out:
	mutex_unlock(&id_priv->handler_mutex);
	return 0;
}

static struct rdma_id_private *
cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
		   const struct ib_cm_event *ib_event,
		   struct net_device *net_dev)
{
	struct rdma_id_private *listen_id_priv;
	struct rdma_id_private *id_priv;
	struct rdma_cm_id *id;
	struct rdma_route *rt;
	const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
	struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
	const __be64 service_id =
		ib_event->param.req_rcvd.primary_path->service_id;
	int ret;

	listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
	id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net,
				   listen_id->event_handler, listen_id->context,
				   listen_id->ps,
				   ib_event->param.req_rcvd.qp_type,
				   listen_id_priv);
	if (IS_ERR(id_priv))
		return NULL;

	id = &id_priv->id;
	if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
			      (struct sockaddr *)&id->route.addr.dst_addr,
			      listen_id, ib_event, ss_family, service_id))
		goto err;

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

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

	if (net_dev) {
		rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
	} else {
		if (!cma_protocol_roce(listen_id) &&
		    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 if (!cma_any_addr(cma_src_addr(id_priv))) {
			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_ib_new_udp_id(const struct rdma_cm_id *listen_id,
		  const struct ib_cm_event *ib_event,
		  struct net_device *net_dev)
{
	const struct rdma_id_private *listen_id_priv;
	struct rdma_id_private *id_priv;
	struct rdma_cm_id *id;
	const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
	struct net *net = listen_id->route.addr.dev_addr.net;
	int ret;

	listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
	id_priv = __rdma_create_id(net, listen_id->event_handler,
				   listen_id->context, listen_id->ps, IB_QPT_UD,
				   listen_id_priv);
	if (IS_ERR(id_priv))
		return NULL;

	id = &id_priv->id;
	if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
			      (struct sockaddr *)&id->route.addr.dst_addr,
			      listen_id, ib_event, ss_family,
			      ib_event->param.sidr_req_rcvd.service_id))
		goto err;

	if (net_dev) {
		rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
	} else {
		if (!cma_any_addr(cma_src_addr(id_priv))) {
			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,
				   const 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;

	event->ece.vendor_id = req_data->ece.vendor_id;
	event->ece.attr_mod = req_data->ece.attr_mod;
}

static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
				    const 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_ib_req_handler(struct ib_cm_id *cm_id,
			      const struct ib_cm_event *ib_event)
{
	struct rdma_id_private *listen_id, *conn_id = NULL;
	struct rdma_cm_event event = {};
	struct cma_req_info req = {};
	struct net_device *net_dev;
	u8 offset;
	int ret;

	listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
	if (IS_ERR(listen_id))
		return PTR_ERR(listen_id);

	trace_cm_req_handler(listen_id, ib_event->event);
	if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
		ret = -EINVAL;
		goto net_dev_put;
	}

	mutex_lock(&listen_id->handler_mutex);
	if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) {
		ret = -ECONNABORTED;
		goto err_unlock;
	}

	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_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
		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_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
		cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
				       ib_event->private_data, offset);
	}
	if (!conn_id) {
		ret = -ENOMEM;
		goto err_unlock;
	}

	mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
	ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
	if (ret) {
		destroy_id_handler_unlock(conn_id);
		goto err_unlock;
	}

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

	ret = cma_cm_event_handler(conn_id, &event);
	if (ret) {
		/* Destroy the CM ID by returning a non-zero value. */
		conn_id->cm_id.ib = NULL;
		mutex_unlock(&listen_id->handler_mutex);
		destroy_id_handler_unlock(conn_id);
		goto net_dev_put;
	}

	if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT &&
	    conn_id->id.qp_type != IB_QPT_UD) {
		trace_cm_send_mra(cm_id->context);
		ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
	}
	mutex_unlock(&conn_id->handler_mutex);

err_unlock:
	mutex_unlock(&listen_id->handler_mutex);

net_dev_put:
	if (net_dev)
		dev_put(net_dev);

	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);

void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
		    union ib_gid *dgid)
{
	struct rdma_addr *addr = &cm_id->route.addr;

	if (!cm_id->device) {
		if (sgid)
			memset(sgid, 0, sizeof(*sgid));
		if (dgid)
			memset(dgid, 0, sizeof(*dgid));
		return;
	}

	if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
		if (sgid)
			rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
		if (dgid)
			rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
	} else {
		if (sgid)
			rdma_addr_get_sgid(&addr->dev_addr, sgid);
		if (dgid)
			rdma_addr_get_dgid(&addr->dev_addr, dgid);
	}
}
EXPORT_SYMBOL(rdma_read_gids);

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;

	mutex_lock(&id_priv->handler_mutex);
	if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
		goto out;

	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:
		goto out;
	}

	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 = cma_cm_event_handler(id_priv, &event);
	if (ret) {
		/* Destroy the CM ID by returning a non-zero value. */
		id_priv->cm_id.iw = NULL;
		destroy_id_handler_unlock(id_priv);
		return ret;
	}

out:
	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_id_private *listen_id, *conn_id;
	struct rdma_cm_event event = {};
	int ret = -ECONNABORTED;
	struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
	struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;

	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;

	listen_id = cm_id->context;

	mutex_lock(&listen_id->handler_mutex);
	if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN)
		goto out;

	/* Create a new RDMA id for the new IW CM ID */
	conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
				   listen_id->id.event_handler,
				   listen_id->id.context, RDMA_PS_TCP,
				   IB_QPT_RC, listen_id);
	if (IS_ERR(conn_id)) {
		ret = -ENOMEM;
		goto out;
	}
	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);
	if (ret) {
		mutex_unlock(&listen_id->handler_mutex);
		destroy_id_handler_unlock(conn_id);
		return ret;
	}

	ret = cma_iw_acquire_dev(conn_id, listen_id);
	if (ret) {
		mutex_unlock(&listen_id->handler_mutex);
		destroy_id_handler_unlock(conn_id);
		return ret;
	}

	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 = cma_cm_event_handler(conn_id, &event);
	if (ret) {
		/* User wants to destroy the CM ID */
		conn_id->cm_id.iw = NULL;
		mutex_unlock(&listen_id->handler_mutex);
		destroy_id_handler_unlock(conn_id);
		return ret;
	}

	mutex_unlock(&conn_id->handler_mutex);

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

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

	addr = cma_src_addr(id_priv);
	svc_id = rdma_get_service_id(&id_priv->id, addr);
	id = ib_cm_insert_listen(id_priv->id.device,
				 cma_ib_req_handler, svc_id);
	if (IS_ERR(id))
		return PTR_ERR(id);
	id_priv->cm_id.ib = id;

	return 0;
}

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);

	mutex_lock(&id_priv->qp_mutex);
	id->tos = id_priv->tos;
	id->tos_set = id_priv->tos_set;
	mutex_unlock(&id_priv->qp_mutex);
	id->afonly = id_priv->afonly;
	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;

	/* Listening IDs are always destroyed on removal */
	if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
		return -1;

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

static int cma_listen_on_dev(struct rdma_id_private *id_priv,
			     struct cma_device *cma_dev,
			     struct rdma_id_private **to_destroy)
{
	struct rdma_id_private *dev_id_priv;
	struct net *net = id_priv->id.route.addr.dev_addr.net;
	int ret;

	lockdep_assert_held(&lock);

	*to_destroy = NULL;
	if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
		return 0;

	dev_id_priv =
		__rdma_create_id(net, cma_listen_handler, id_priv,
				 id_priv->id.ps, id_priv->id.qp_type, id_priv);
	if (IS_ERR(dev_id_priv))
		return PTR_ERR(dev_id_priv);

	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);
	rdma_restrack_add(&dev_id_priv->res);
	cma_id_get(id_priv);
	dev_id_priv->internal_id = 1;
	dev_id_priv->afonly = id_priv->afonly;
	mutex_lock(&id_priv->qp_mutex);
	dev_id_priv->tos_set = id_priv->tos_set;
	dev_id_priv->tos = id_priv->tos;
	mutex_unlock(&id_priv->qp_mutex);

	ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
	if (ret)
		goto err_listen;
	list_add_tail(&dev_id_priv->listen_item, &id_priv->listen_list);
	return 0;
err_listen:
	/* Caller must destroy this after releasing lock */
	*to_destroy = dev_id_priv;
	dev_warn(&cma_dev->device->dev, "RDMA CMA: %s, error %d\n", __func__, ret);
	return ret;
}

static int cma_listen_on_all(struct rdma_id_private *id_priv)
{
	struct rdma_id_private *to_destroy;
	struct cma_device *cma_dev;
	int ret;

	mutex_lock(&lock);
	list_add_tail(&id_priv->listen_any_item, &listen_any_list);
	list_for_each_entry(cma_dev, &dev_list, list) {
		ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
		if (ret) {
			/* Prevent racing with cma_process_remove() */
			if (to_destroy)
				list_del_init(&to_destroy->device_item);
			goto err_listen;
		}
	}
	mutex_unlock(&lock);
	return 0;

err_listen:
	_cma_cancel_listens(id_priv);
	mutex_unlock(&lock);
	if (to_destroy)
		rdma_destroy_id(&to_destroy->id);
	return ret;
}

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);
	mutex_lock(&id_priv->qp_mutex);
	id_priv->tos = (u8) tos;
	id_priv->tos_set = true;
	mutex_unlock(&id_priv->qp_mutex);
}
EXPORT_SYMBOL(rdma_set_service_type);

/**
 * rdma_set_ack_timeout() - Set the ack timeout of QP associated
 *                          with a connection identifier.
 * @id: Communication identifier to associated with service type.
 * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
 *
 * This function should be called before rdma_connect() on active side,
 * and on passive side before rdma_accept(). It is applicable to primary
 * path only. The timeout will affect the local side of the QP, it is not
 * negotiated with remote side and zero disables the timer. In case it is
 * set before rdma_resolve_route, the value will also be used to determine
 * PacketLifeTime for RoCE.
 *
 * Return: 0 for success
 */
int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
{
	struct rdma_id_private *id_priv;

	if (id->qp_type != IB_QPT_RC)
		return -EINVAL;

	id_priv = container_of(id, struct rdma_id_private, id);
	mutex_lock(&id_priv->qp_mutex);
	id_priv->timeout = timeout;
	id_priv->timeout_set = true;
	mutex_unlock(&id_priv->qp_mutex);

	return 0;
}
EXPORT_SYMBOL(rdma_set_ack_timeout);

/**
 * rdma_set_min_rnr_timer() - Set the minimum RNR Retry timer of the
 *			      QP associated with a connection identifier.
 * @id: Communication identifier to associated with service type.
 * @min_rnr_timer: 5-bit value encoded as Table 45: "Encoding for RNR NAK
 *		   Timer Field" in the IBTA specification.
 *
 * This function should be called before rdma_connect() on active
 * side, and on passive side before rdma_accept(). The timer value
 * will be associated with the local QP. When it receives a send it is
 * not read to handle, typically if the receive queue is empty, an RNR
 * Retry NAK is returned to the requester with the min_rnr_timer
 * encoded. The requester will then wait at least the time specified
 * in the NAK before retrying. The default is zero, which translates
 * to a minimum RNR Timer value of 655 ms.
 *
 * Return: 0 for success
 */
int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer)
{
	struct rdma_id_private *id_priv;

	/* It is a five-bit value */
	if (min_rnr_timer & 0xe0)
		return -EINVAL;

	if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT))
		return -EINVAL;

	id_priv = container_of(id, struct rdma_id_private, id);
	mutex_lock(&id_priv->qp_mutex);
	id_priv->min_rnr_timer = min_rnr_timer;
	id_priv->min_rnr_timer_set = true;
	mutex_unlock(&id_priv->qp_mutex);

	return 0;
}
EXPORT_SYMBOL(rdma_set_min_rnr_timer);

static void cma_query_handler(int status, struct 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;
		pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
				     status);
	}

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

static int cma_query_ib_route(struct rdma_id_private *id_priv,
			      unsigned long timeout_ms, struct cma_work *work)
{
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	struct 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);

	if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
		path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
	else
		path_rec.rec_type = SA_PATH_REC_TYPE_IB;
	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_iboe_join_work_handler(struct work_struct *work)
{
	struct cma_multicast *mc =
		container_of(work, struct cma_multicast, iboe_join.work);
	struct rdma_cm_event *event = &mc->iboe_join.event;
	struct rdma_id_private *id_priv = mc->id_priv;
	int ret;

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

	ret = cma_cm_event_handler(id_priv, event);
	WARN_ON(ret);

out_unlock:
	mutex_unlock(&id_priv->handler_mutex);
	if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN)
		rdma_destroy_ah_attr(&event->param.ud.ah_attr);
}

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;

	mutex_lock(&id_priv->handler_mutex);
	if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
	    READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
		goto out_unlock;
	if (work->old_state != 0 || work->new_state != 0) {
		if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
			goto out_unlock;
	}

	if (cma_cm_event_handler(id_priv, &work->event)) {
		cma_id_put(id_priv);
		destroy_id_handler_unlock(id_priv);
		goto out_free;
	}

out_unlock:
	mutex_unlock(&id_priv->handler_mutex);
	cma_id_put(id_priv);
out_free:
	if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
		rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
	kfree(work);
}

static void cma_init_resolve_route_work(struct cma_work *work,
					struct rdma_id_private *id_priv)
{
	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;
}

static void enqueue_resolve_addr_work(struct cma_work *work,
				      struct rdma_id_private *id_priv)
{
	/* Balances with cma_id_put() in cma_work_handler */
	cma_id_get(id_priv);

	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);
}

static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
				unsigned long 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;

	cma_init_resolve_route_work(work, id_priv);

	if (!route->path_rec)
		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;
}

static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
					   unsigned long supported_gids,
					   enum ib_gid_type default_gid)
{
	if ((network_type == RDMA_NETWORK_IPV4 ||
	     network_type == RDMA_NETWORK_IPV6) &&
	    test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
		return IB_GID_TYPE_ROCE_UDP_ENCAP;

	return default_gid;
}

/*
 * cma_iboe_set_path_rec_l2_fields() is helper function which sets
 * path record type based on GID type.
 * It also sets up other L2 fields which includes destination mac address
 * netdev ifindex, of the path record.
 * It returns the netdev of the bound interface for this path record entry.
 */
static struct net_device *
cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
{
	struct rdma_route *route = &id_priv->id.route;
	enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
	struct rdma_addr *addr = &route->addr;
	unsigned long supported_gids;
	struct net_device *ndev;

	if (!addr->dev_addr.bound_dev_if)
		return NULL;

	ndev = dev_get_by_index(addr->dev_addr.net,
				addr->dev_addr.bound_dev_if);
	if (!ndev)
		return NULL;

	supported_gids = roce_gid_type_mask_support(id_priv->id.device,
						    id_priv->id.port_num);
	gid_type = cma_route_gid_type(addr->dev_addr.network,
				      supported_gids,
				      id_priv->gid_type);
	/* Use the hint from IP Stack to select GID Type */
	if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
		gid_type = ib_network_to_gid_type(addr->dev_addr.network);
	route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);

	route->path_rec->roce.route_resolved = true;
	sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
	return ndev;
}

int rdma_set_ib_path(struct rdma_cm_id *id,
		     struct sa_path_rec *path_rec)
{
	struct rdma_id_private *id_priv;
	struct net_device *ndev;
	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),
				     GFP_KERNEL);
	if (!id->route.path_rec) {
		ret = -ENOMEM;
		goto err;
	}

	if (rdma_protocol_roce(id->device, id->port_num)) {
		ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
		if (!ndev) {
			ret = -ENODEV;
			goto err_free;
		}
		dev_put(ndev);
	}

	id->route.num_paths = 1;
	return 0;

err_free:
	kfree(id->route.path_rec);
	id->route.path_rec = NULL;
err:
	cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
	return ret;
}
EXPORT_SYMBOL(rdma_set_ib_path);

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

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

	cma_init_resolve_route_work(work, id_priv);
	queue_work(cma_wq, &work->work);
	return 0;
}

static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
{
	struct net_device *dev;

	dev = vlan_dev_real_dev(vlan_ndev);
	if (dev->num_tc)