Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 5148 insertions, 0 deletions

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
new file mode 100644
index 000000000..0603d069d
--- /dev/null
+++ b/drivers/infiniband/core/cma.c
@@ -0,0 +1,5148 @@
+// 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_QUERY_CLASSPORT_INFO_TIMEOUT 3000
+#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_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
+			      enum ib_gid_type gid_type);
+
+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;
+};
+
+struct class_port_info_context {
+	struct ib_class_port_info	*class_port_info;
+	struct ib_device		*device;
+	struct completion		done;
+	struct ib_sa_query		*sa_query;
+	u8				port_num;
+};
+
+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,
+			     unsigned int 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,
+			     unsigned int 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, unsigned int 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, unsigned int 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->list, &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(&id_priv->list);
+	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_default_qkey(struct rdma_id_private *id_priv)
+{
+	struct ib_sa_mcmember_rec rec;
+	int ret = 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 int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
+{
+	if (!qkey ||
+	    (id_priv->qkey && (id_priv->qkey != qkey)))
+		return -EINVAL;
+
+	id_priv->qkey = qkey;
+	return 0;
+}
+
+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, u8 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;
+	unsigned int 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;
+	unsigned int port;
+	union ib_gid gid;
+
+	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 ret;
+	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; i < cur_dev->device->port_data[p].immutable.gid_tbl_len;
+			     ++i) {
+				ret = rdma_query_gid(cur_dev->device, p, i,
+						     &gid);
+				if (ret)
+					continue;
+
+				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->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->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_default_qkey(id_priv);
+		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;
+
+	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_oif = 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 int 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_list) {
+				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->src_addr_storage,
+				 (struct sockaddr *)&req->listen_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(&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);
+	}
+}
+
+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 && !send_only) {
+			enum ib_gid_type gid_type;
+			union ib_gid mgid;
+
+			gid_type = id_priv->cma_dev->default_gid_type
+					   [id_priv->id.port_num -
+					    rdma_start_port(
+						    id_priv->cma_dev->device)];
+			cma_iboe_set_mgid((struct sockaddr *)&mc->addr, &mgid,
+					  gid_type);
+			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_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_list, &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->list, &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->list);
+			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 && id->qp_type != IB_QPT_XRC_INI)
+		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);
+
+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)
+		return netdev_get_prio_tc_map(dev, prio);
+
+	return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
+		VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
+}
+
+struct iboe_prio_tc_map {
+	int input_prio;
+	int output_tc;
+	bool found;
+};
+
+static int get_lower_vlan_dev_tc(struct net_device *dev,
+				 struct netdev_nested_priv *priv)
+{
+	struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data;
+
+	if (is_vlan_dev(dev))
+		map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
+	else if (dev->num_tc)
+		map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
+	else
+		map->output_tc = 0;
+	/* We are interested only in first level VLAN device, so always
+	 * return 1 to stop iterating over next level devices.
+	 */
+	map->found = true;
+	return 1;
+}
+
+static int iboe_tos_to_sl(struct net_device *ndev, int tos)
+{
+	struct iboe_prio_tc_map prio_tc_map = {};
+	int prio = rt_tos2priority(tos);
+	struct netdev_nested_priv priv;
+
+	/* If VLAN device, get it directly from the VLAN netdev */
+	if (is_vlan_dev(ndev))
+		return get_vlan_ndev_tc(ndev, prio);
+
+	prio_tc_map.input_prio = prio;
+	priv.data = (void *)&prio_tc_map;
+	rcu_read_lock();
+	netdev_walk_all_lower_dev_rcu(ndev,
+				      get_lower_vlan_dev_tc,
+				      &priv);
+	rcu_read_unlock();
+	/* If map is found from lower device, use it; Otherwise
+	 * continue with the current netdevice to get priority to tc map.
+	 */
+	if (prio_tc_map.found)
+		return prio_tc_map.output_tc;
+	else if (ndev->num_tc)
+		return netdev_get_prio_tc_map(ndev, prio);
+	else
+		return 0;
+}
+
+static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
+{
+	struct sockaddr_in6 *addr6;
+	u16 dport, sport;
+	u32 hash, fl;
+
+	addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
+	fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
+	if ((cma_family(id_priv) != AF_INET6) || !fl) {
+		dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
+		sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
+		hash = (u32)sport * 31 + dport;
+		fl = hash & IB_GRH_FLOWLABEL_MASK;
+	}
+
+	return cpu_to_be32(fl);
+}
+
+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;
+
+	u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
+					rdma_start_port(id_priv->cma_dev->device)];
+	u8 tos;
+
+	mutex_lock(&id_priv->qp_mutex);
+	tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
+	mutex_unlock(&id_priv->qp_mutex);
+
+	work = kzalloc(sizeof *work, GFP_KERNEL);
+	if (!work)
+		return -ENOMEM;
+
+	route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
+	if (!route->path_rec) {
+		ret = -ENOMEM;
+		goto err1;
+	}
+
+	route->num_paths = 1;
+
+	ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
+	if (!ndev) {
+		ret = -ENODEV;
+		goto err2;
+	}
+
+	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);
+
+	if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
+		/* TODO: get the hoplimit from the inet/inet6 device */
+		route->path_rec->hop_limit = addr->dev_addr.hoplimit;
+	else
+		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, tos);
+	route->path_rec->traffic_class = tos;
+	route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
+	route->path_rec->rate_selector = IB_SA_EQ;
+	route->path_rec->rate = IB_RATE_PORT_CURRENT;
+	dev_put(ndev);
+	route->path_rec->packet_life_time_selector = IB_SA_EQ;
+	/* In case ACK timeout is set, use this value to calculate
+	 * PacketLifeTime.  As per IBTA 12.7.34,
+	 * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
+	 * Assuming a negligible local ACK delay, we can use
+	 * PacketLifeTime = local ACK timeout/2
+	 * as a reasonable approximation for RoCE networks.
+	 */
+	mutex_lock(&id_priv->qp_mutex);
+	if (id_priv->timeout_set && id_priv->timeout)
+		route->path_rec->packet_life_time = id_priv->timeout - 1;
+	else
+		route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
+	mutex_unlock(&id_priv->qp_mutex);
+
+	if (!route->path_rec->mtu) {
+		ret = -EINVAL;
+		goto err2;
+	}
+
+	if (rdma_protocol_roce_udp_encap(id_priv->id.device,
+					 id_priv->id.port_num))
+		route->path_rec->flow_label =
+			cma_get_roce_udp_flow_label(id_priv);
+
+	cma_init_resolve_route_work(work, id_priv);
+	queue_work(cma_wq, &work->work);
+
+	return 0;
+
+err2:
+	kfree(route->path_rec);
+	route->path_rec = NULL;
+	route->num_paths = 0;
+err1:
+	kfree(work);
+	return ret;
+}
+
+int rdma_resolve_route(struct rdma_cm_id *id, unsigned long 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;
+
+	cma_id_get(id_priv);
+	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);
+	else
+		ret = -ENOSYS;
+
+	if (ret)
+		goto err;
+
+	return 0;
+err:
+	cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
+	cma_id_put(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;
+	union ib_gid gid;
+	enum ib_port_state port_state;
+	unsigned int p;
+	u16 pkey;
+	int ret;
+
+	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;
+
+		rdma_for_each_port (cur_dev->device, p) {
+			if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
+			    port_state == IB_PORT_ACTIVE) {
+				cma_dev = cur_dev;
+				goto port_found;
+			}
+		}
+	}
+
+	if (!cma_dev) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	p = 1;
+
+port_found:
+	ret = rdma_query_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);
+	rdma_restrack_add(&id_priv->res);
+	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 = {};
+	struct sockaddr *addr;
+	struct sockaddr_storage old_addr;
+
+	mutex_lock(&id_priv->handler_mutex);
+	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
+			   RDMA_CM_ADDR_RESOLVED))
+		goto out;
+
+	/*
+	 * Store the previous src address, so that if we fail to acquire
+	 * matching rdma device, old address can be restored back, which helps
+	 * to cancel the cma listen operation correctly.
+	 */
+	addr = cma_src_addr(id_priv);
+	memcpy(&old_addr, addr, rdma_addr_size(addr));
+	memcpy(addr, src_addr, rdma_addr_size(src_addr));
+	if (!status && !id_priv->cma_dev) {
+		status = cma_acquire_dev_by_src_ip(id_priv);
+		if (status)
+			pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
+					     status);
+		rdma_restrack_add(&id_priv->res);
+	} else if (status) {
+		pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
+	}
+
+	if (status) {
+		memcpy(addr, &old_addr,
+		       rdma_addr_size((struct sockaddr *)&old_addr));
+		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 (cma_cm_event_handler(id_priv, &event)) {
+		destroy_id_handler_unlock(id_priv);
+		return;
+	}
+out:
+	mutex_unlock(&id_priv->handler_mutex);
+}
+
+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);
+
+	enqueue_resolve_addr_work(work, id_priv);
+	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));
+
+	enqueue_resolve_addr_work(work, id_priv);
+	return 0;
+err:
+	kfree(work);
+	return ret;
+}
+
+static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
+			 const struct sockaddr *dst_addr)
+{
+	struct sockaddr_storage zero_sock = {};
+
+	if (src_addr && src_addr->sa_family)
+		return rdma_bind_addr(id, src_addr);
+
+	/*
+	 * When the src_addr is not specified, automatically supply an any addr
+	 */
+	zero_sock.ss_family = dst_addr->sa_family;
+	if (IS_ENABLED(CONFIG_IPV6) && dst_addr->sa_family == AF_INET6) {
+		struct sockaddr_in6 *src_addr6 =
+			(struct sockaddr_in6 *)&zero_sock;
+		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 *)&zero_sock)->sib_pkey =
+			((struct sockaddr_ib *)dst_addr)->sib_pkey;
+	}
+	return rdma_bind_addr(id, (struct sockaddr *)&zero_sock);
+}
+
+/*
+ * If required, resolve the source address for bind and leave the id_priv in
+ * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior
+ * calls made by ULP, a previously bound ID will not be re-bound and src_addr is
+ * ignored.
+ */
+static int resolve_prepare_src(struct rdma_id_private *id_priv,
+			       struct sockaddr *src_addr,
+			       const struct sockaddr *dst_addr)
+{
+	int ret;
+
+	memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
+	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
+		/* For a well behaved ULP state will be RDMA_CM_IDLE */
+		ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr);
+		if (ret)
+			goto err_dst;
+		if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
+					   RDMA_CM_ADDR_QUERY))) {
+			ret = -EINVAL;
+			goto err_dst;
+		}
+	}
+
+	if (cma_family(id_priv) != dst_addr->sa_family) {
+		ret = -EINVAL;
+		goto err_state;
+	}
+	return 0;
+
+err_state:
+	cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
+err_dst:
+	memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
+	return ret;
+}
+
+int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
+		      const struct sockaddr *dst_addr, unsigned long timeout_ms)
+{
+	struct rdma_id_private *id_priv =
+		container_of(id, struct rdma_id_private, id);
+	int ret;
+
+	ret = resolve_prepare_src(id_priv, src_addr, dst_addr);
+	if (ret)
+		return ret;
+
+	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 {
+			/*
+			 * The FSM can return back to RDMA_CM_ADDR_BOUND after
+			 * rdma_resolve_ip() is called, eg through the error
+			 * path in addr_handler(). If this happens the existing
+			 * request must be canceled before issuing a new one.
+			 * Since canceling a request is a bit slow and this
+			 * oddball path is rare, keep track once a request has
+			 * been issued. The track turns out to be a permanent
+			 * state since this is the only cancel as it is
+			 * immediately before rdma_resolve_ip().
+			 */
+			if (id_priv->used_resolve_ip)
+				rdma_addr_cancel(&id->route.addr.dev_addr);
+			else
+				id_priv->used_resolve_ip = 1;
+			ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
+					      &id->route.addr.dev_addr,
+					      timeout_ms, addr_handler,
+					      false, id_priv);
+		}
+	}
+	if (ret)
+		goto err;
+
+	return 0;
+err:
+	cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
+	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_LISTEN) ||
+	    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;
+
+	lockdep_assert_held(&lock);
+
+	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(enum rdma_ucm_port_space ps,
+			  struct rdma_id_private *id_priv, unsigned short snum)
+{
+	struct rdma_bind_list *bind_list;
+	int ret;
+
+	lockdep_assert_held(&lock);
+
+	bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
+	if (!bind_list)
+		return -ENOMEM;
+
+	ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
+			   snum);
+	if (ret < 0)
+		goto err;
+
+	bind_list->ps = ps;
+	bind_list->port = snum;
+	cma_bind_port(bind_list, id_priv);
+	return 0;
+err:
+	kfree(bind_list);
+	return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
+}
+
+static int cma_port_is_unique(struct rdma_bind_list *bind_list,
+			      struct rdma_id_private *id_priv)
+{
+	struct rdma_id_private *cur_id;
+	struct sockaddr  *daddr = cma_dst_addr(id_priv);
+	struct sockaddr  *saddr = cma_src_addr(id_priv);
+	__be16 dport = cma_port(daddr);
+
+	lockdep_assert_held(&lock);
+
+	hlist_for_each_entry(cur_id, &bind_list->owners, node) {
+		struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
+		struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
+		__be16 cur_dport = cma_port(cur_daddr);
+
+		if (id_priv == cur_id)
+			continue;
+
+		/* different dest port -> unique */
+		if (!cma_any_port(daddr) &&
+		    !cma_any_port(cur_daddr) &&
+		    (dport != cur_dport))
+			continue;
+
+		/* different src address -> unique */
+		if (!cma_any_addr(saddr) &&
+		    !cma_any_addr(cur_saddr) &&
+		    cma_addr_cmp(saddr, cur_saddr))
+			continue;
+
+		/* different dst address -> unique */
+		if (!cma_any_addr(daddr) &&
+		    !cma_any_addr(cur_daddr) &&
+		    cma_addr_cmp(daddr, cur_daddr))
+			continue;
+
+		return -EADDRNOTAVAIL;
+	}
+	return 0;
+}
+
+static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
+			      struct rdma_id_private *id_priv)
+{
+	static unsigned int last_used_port;
+	int low, high, remaining;
+	unsigned int rover;
+	struct net *net = id_priv->id.route.addr.dev_addr.net;
+
+	lockdep_assert_held(&lock);
+
+	inet_get_local_port_range(net, &low, &high);
+	remaining = (high - low) + 1;
+	rover = prandom_u32() % remaining + low;
+retry:
+	if (last_used_port != rover) {
+		struct rdma_bind_list *bind_list;
+		int ret;
+
+		bind_list = cma_ps_find(net, ps, (unsigned short)rover);
+
+		if (!bind_list) {
+			ret = cma_alloc_port(ps, id_priv, rover);
+		} else {
+			ret = cma_port_is_unique(bind_list, id_priv);
+			if (!ret)
+				cma_bind_port(bind_list, id_priv);
+		}
+		/*
+		 * 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;
+
+	lockdep_assert_held(&lock);
+
+	addr = cma_src_addr(id_priv);
+	hlist_for_each_entry(cur_id, &bind_list->owners, node) {
+		if (id_priv == cur_id)
+			continue;
+
+		if (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(enum rdma_ucm_port_space ps,
+			struct rdma_id_private *id_priv)
+{
+	struct rdma_bind_list *bind_list;
+	unsigned short snum;
+	int ret;
+
+	lockdep_assert_held(&lock);
+
+	snum = ntohs(cma_port(cma_src_addr(id_priv)));
+	if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
+		return -EACCES;
+
+	bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, 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 enum rdma_ucm_port_space
+cma_select_inet_ps(struct rdma_id_private *id_priv)
+{
+	switch (id_priv->id.ps) {
+	case RDMA_PS_TCP:
+	case RDMA_PS_UDP:
+	case RDMA_PS_IPOIB:
+	case RDMA_PS_IB:
+		return id_priv->id.ps;
+	default:
+
+		return 0;
+	}
+}
+
+static enum rdma_ucm_port_space
+cma_select_ib_ps(struct rdma_id_private *id_priv)
+{
+	enum rdma_ucm_port_space ps = 0;
+	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 = RDMA_PS_IB;
+	} 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 = RDMA_PS_TCP;
+	} 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 = RDMA_PS_UDP;
+	}
+
+	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)
+{
+	enum rdma_ucm_port_space 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 =
+		container_of(id, struct rdma_id_private, id);
+	int ret;
+
+	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) {
+		struct sockaddr_in any_in = {
+			.sin_family = AF_INET,
+			.sin_addr.s_addr = htonl(INADDR_ANY),
+		};
+
+		/* For a well behaved ULP state will be RDMA_CM_IDLE */
+		ret = rdma_bind_addr(id, (struct sockaddr *)&any_in);
+		if (ret)
+			return ret;
+		if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
+					   RDMA_CM_LISTEN)))
+			return -EINVAL;
+	}
+
+	/*
+	 * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable
+	 * any more, and has to be unique in the bind list.
+	 */
+	if (id_priv->reuseaddr) {
+		mutex_lock(&lock);
+		ret = cma_check_port(id_priv->bind_list, id_priv, 0);
+		if (!ret)
+			id_priv->reuseaddr = 0;
+		mutex_unlock(&lock);
+		if (ret)
+			goto err;
+	}
+
+	id_priv->backlog = backlog;
+	if (id_priv->cma_dev) {
+		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 {
+		ret = cma_listen_on_all(id_priv);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+err:
+	id_priv->backlog = 0;
+	/*
+	 * All the failure paths that lead here will not allow the req_handler's
+	 * to have run.
+	 */
+	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;
+	struct sockaddr  *daddr;
+
+	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_by_src_ip(id_priv);
+		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) {
+			struct net *net = id_priv->id.route.addr.dev_addr.net;
+
+			id_priv->afonly = net->ipv6.sysctl.bindv6only;
+		}
+#endif
+	}
+	daddr = cma_dst_addr(id_priv);
+	daddr->sa_family = addr->sa_family;
+
+	ret = cma_get_port(id_priv);
+	if (ret)
+		goto err2;
+
+	if (!cma_any_addr(addr))
+		rdma_restrack_add(&id_priv->res);
+	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,
+				const struct ib_cm_event *ib_event)
+{
+	struct rdma_id_private *id_priv = cm_id->context;
+	struct rdma_cm_event event = {};
+	const struct ib_cm_sidr_rep_event_param *rep =
+				&ib_event->param.sidr_rep_rcvd;
+	int ret;
+
+	mutex_lock(&id_priv->handler_mutex);
+	if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
+		goto out;
+
+	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;
+			pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
+					     event.status);
+			break;
+		}
+		ret = cma_set_qkey(id_priv, rep->qkey);
+		if (ret) {
+			pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
+			event.event = RDMA_CM_EVENT_ADDR_ERROR;
+			event.status = ret;
+			break;
+		}
+		ib_init_ah_attr_from_path(id_priv->id.device,
+					  id_priv->id.port_num,
+					  id_priv->id.route.path_rec,
+					  &event.param.ud.ah_attr,
+					  rep->sgid_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:
+		pr_err("RDMA CMA: unexpected IB CM event: %d\n",
+		       ib_event->event);
+		goto out;
+	}
+
+	ret = cma_cm_event_handler(id_priv, &event);
+
+	rdma_destroy_ah_attr(&event.param.ud.ah_attr);
+	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 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;
+	u8 offset;
+	int 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.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
+	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;
+
+	trace_cm_send_sidr_req(id_priv);
+	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;
+	u8 offset;
+	int 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.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
+	/* Alternate path SGID attribute currently unsupported */
+	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;
+	req.ece.vendor_id = id_priv->ece.vendor_id;
+	req.ece.attr_mod = id_priv->ece.attr_mod;
+
+	trace_cm_send_req(id_priv);
+	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);
+
+	mutex_lock(&id_priv->qp_mutex);
+	cm_id->tos = id_priv->tos;
+	cm_id->tos_set = id_priv->tos_set;
+	mutex_unlock(&id_priv->qp_mutex);
+
+	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;
+}
+
+/**
+ * rdma_connect_locked - Initiate an active connection request.
+ * @id: Connection identifier to connect.
+ * @conn_param: Connection information used for connected QPs.
+ *
+ * Same as rdma_connect() but can only be called from the
+ * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback.
+ */
+int rdma_connect_locked(struct rdma_cm_id *id,
+			struct rdma_conn_param *conn_param)
+{
+	struct rdma_id_private *id_priv =
+		container_of(id, struct rdma_id_private, id);
+	int ret;
+
+	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_state;
+	return 0;
+err_state:
+	cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
+	return ret;
+}
+EXPORT_SYMBOL(rdma_connect_locked);
+
+/**
+ * rdma_connect - Initiate an active connection request.
+ * @id: Connection identifier to connect.
+ * @conn_param: Connection information used for connected QPs.
+ *
+ * Users must have resolved a route for the rdma_cm_id to connect with by having
+ * called rdma_resolve_route before calling this routine.
+ *
+ * This call will either connect to a remote QP or obtain remote QP information
+ * for unconnected rdma_cm_id's.  The actual operation is based on the
+ * rdma_cm_id's port space.
+ */
+int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
+{
+	struct rdma_id_private *id_priv =
+		container_of(id, struct rdma_id_private, id);
+	int ret;
+
+	mutex_lock(&id_priv->handler_mutex);
+	ret = rdma_connect_locked(id, conn_param);
+	mutex_unlock(&id_priv->handler_mutex);
+	return ret;
+}
+EXPORT_SYMBOL(rdma_connect);
+
+/**
+ * rdma_connect_ece - Initiate an active connection request with ECE data.
+ * @id: Connection identifier to connect.
+ * @conn_param: Connection information used for connected QPs.
+ * @ece: ECE parameters
+ *
+ * See rdma_connect() explanation.
+ */
+int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
+		     struct rdma_ucm_ece *ece)
+{
+	struct rdma_id_private *id_priv =
+		container_of(id, struct rdma_id_private, id);
+
+	id_priv->ece.vendor_id = ece->vendor_id;
+	id_priv->ece.attr_mod = ece->attr_mod;
+
+	return rdma_connect(id, conn_param);
+}
+EXPORT_SYMBOL(rdma_connect_ece);
+
+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;
+	rep.ece.vendor_id = id_priv->ece.vendor_id;
+	rep.ece.attr_mod = id_priv->ece.attr_mod;
+
+	trace_cm_send_rep(id_priv);
+	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;
+
+	if (!conn_param)
+		return -EINVAL;
+
+	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) {
+		if (qkey)
+			ret = cma_set_qkey(id_priv, qkey);
+		else
+			ret = cma_set_default_qkey(id_priv);
+		if (ret)
+			return ret;
+		rep.qp_num = id_priv->qp_num;
+		rep.qkey = id_priv->qkey;
+
+		rep.ece.vendor_id = id_priv->ece.vendor_id;
+		rep.ece.attr_mod = id_priv->ece.attr_mod;
+	}
+
+	rep.private_data = private_data;
+	rep.private_data_len = private_data_len;
+
+	trace_cm_send_sidr_rep(id_priv);
+	return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
+}
+
+/**
+ * rdma_accept - Called to accept a connection request or response.
+ * @id: Connection identifier associated with the request.
+ * @conn_param: Information needed to establish the connection.  This must be
+ *   provided if accepting a connection request.  If accepting a connection
+ *   response, this parameter must be NULL.
+ *
+ * Typically, this routine is only called by the listener to accept a connection
+ * request.  It must also be called on the active side of a connection if the
+ * user is performing their own QP transitions.
+ *
+ * In the case of error, a reject message is sent to the remote side and the
+ * state of the qp associated with the id is modified to error, such that any
+ * previously posted receive buffers would be flushed.
+ *
+ * This function is for use by kernel ULPs and must be called from under the
+ * handler callback.
+ */
+int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
+{
+	struct rdma_id_private *id_priv =
+		container_of(id, struct rdma_id_private, id);
+	int ret;
+
+	lockdep_assert_held(&id_priv->handler_mutex);
+
+	if (READ_ONCE(id_priv->state) != 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, IB_CM_REJ_CONSUMER_DEFINED);
+	return ret;
+}
+EXPORT_SYMBOL(rdma_accept);
+
+int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
+		    struct rdma_ucm_ece *ece)
+{
+	struct rdma_id_private *id_priv =
+		container_of(id, struct rdma_id_private, id);
+
+	id_priv->ece.vendor_id = ece->vendor_id;
+	id_priv->ece.attr_mod = ece->attr_mod;
+
+	return rdma_accept(id, conn_param);
+}
+EXPORT_SYMBOL(rdma_accept_ece);
+
+void rdma_lock_handler(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);
+}
+EXPORT_SYMBOL(rdma_lock_handler);
+
+void rdma_unlock_handler(struct rdma_cm_id *id)
+{
+	struct rdma_id_private *id_priv =
+		container_of(id, struct rdma_id_private, id);
+
+	mutex_unlock(&id_priv->handler_mutex);
+}
+EXPORT_SYMBOL(rdma_unlock_handler);
+
+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, u8 reason)
+{
+	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 {
+			trace_cm_send_rej(id_priv);
+			ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, 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. */
+		trace_cm_disconnect(id_priv);
+		if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
+			if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
+				trace_cm_sent_drep(id_priv);
+		} else {
+			trace_cm_sent_dreq(id_priv);
+		}
+	} 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 void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
+			      struct ib_sa_multicast *multicast,
+			      struct rdma_cm_event *event,
+			      struct cma_multicast *mc)
+{
+	struct rdma_dev_addr *dev_addr;
+	enum ib_gid_type gid_type;
+	struct net_device *ndev;
+
+	if (status)
+		pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
+				     status);
+
+	event->status = status;
+	event->param.ud.private_data = mc->context;
+	if (status) {
+		event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
+		return;
+	}
+
+	dev_addr = &id_priv->id.route.addr.dev_addr;
+	ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
+	gid_type =
+		id_priv->cma_dev
+			->default_gid_type[id_priv->id.port_num -
+					   rdma_start_port(
+						   id_priv->cma_dev->device)];
+
+	event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
+	if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
+				     &multicast->rec, ndev, gid_type,
+				     &event->param.ud.ah_attr)) {
+		event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
+		goto out;
+	}
+
+	event->param.ud.qp_num = 0xFFFFFF;
+	event->param.ud.qkey = id_priv->qkey;
+
+out:
+	if (ndev)
+		dev_put(ndev);
+}
+
+static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
+{
+	struct cma_multicast *mc = multicast->context;
+	struct rdma_id_private *id_priv = mc->id_priv;
+	struct rdma_cm_event event = {};
+	int ret = 0;
+
+	mutex_lock(&id_priv->handler_mutex);
+	if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
+	    READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
+		goto out;
+
+	ret = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
+	if (!ret) {
+		cma_make_mc_event(status, id_priv, multicast, &event, mc);
+		ret = cma_cm_event_handler(id_priv, &event);
+	}
+	rdma_destroy_ah_attr(&event.param.ud.ah_attr);
+	WARN_ON(ret);
+
+out:
+	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;
+
+	if (!id_priv->qkey) {
+		ret = cma_set_default_qkey(id_priv);
+		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 = mc->join_state;
+
+	if ((rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) &&
+	    (!ib_sa_sendonly_fullmem_support(&sa_client,
+					     id_priv->id.device,
+					     id_priv->id.port_num))) {
+		dev_warn(
+			&id_priv->id.device->dev,
+			"RDMA CM: port %u Unable to multicast join: SM doesn't support Send Only Full Member option\n",
+			id_priv->id.port_num);
+		return -EOPNOTSUPP;
+	}
+
+	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->sa_mc = 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->sa_mc);
+}
+
+static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
+			      enum ib_gid_type gid_type)
+{
+	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] =
+			(gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
+		mgid->raw[1] =
+			(gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 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 rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
+	int err = 0;
+	struct sockaddr *addr = (struct sockaddr *)&mc->addr;
+	struct net_device *ndev = NULL;
+	struct ib_sa_multicast ib = {};
+	enum ib_gid_type gid_type;
+	bool send_only;
+
+	send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
+
+	if (cma_zero_addr(addr))
+		return -EINVAL;
+
+	gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
+		   rdma_start_port(id_priv->cma_dev->device)];
+	cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
+
+	ib.rec.pkey = cpu_to_be16(0xffff);
+	if (dev_addr->bound_dev_if)
+		ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
+	if (!ndev)
+		return -ENODEV;
+
+	ib.rec.rate = IB_RATE_PORT_CURRENT;
+	ib.rec.hop_limit = 1;
+	ib.rec.mtu = iboe_get_mtu(ndev->mtu);
+
+	if (addr->sa_family == AF_INET) {
+		if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
+			ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
+			if (!send_only) {
+				err = cma_igmp_send(ndev, &ib.rec.mgid,
+						    true);
+			}
+		}
+	} else {
+		if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
+			err = -ENOTSUPP;
+	}
+	dev_put(ndev);
+	if (err || !ib.rec.mtu)
+		return err ?: -EINVAL;
+
+	if (!id_priv->qkey)
+		cma_set_default_qkey(id_priv);
+
+	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
+		    &ib.rec.port_gid);
+	INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler);
+	cma_make_mc_event(0, id_priv, &ib, &mc->iboe_join.event, mc);
+	queue_work(cma_wq, &mc->iboe_join.work);
+	return 0;
+}
+
+int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
+			u8 join_state, void *context)
+{
+	struct rdma_id_private *id_priv =
+		container_of(id, struct rdma_id_private, id);
+	struct cma_multicast *mc;
+	int ret;
+
+	/* Not supported for kernel QPs */
+	if (WARN_ON(id->qp))
+		return -EINVAL;
+
+	/* ULP is calling this wrong. */
+	if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND &&
+			    READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
+		return -EINVAL;
+
+	if (id_priv->id.qp_type != IB_QPT_UD)
+		return -EINVAL;
+
+	mc = kzalloc(sizeof(*mc), GFP_KERNEL);
+	if (!mc)
+		return -ENOMEM;
+
+	memcpy(&mc->addr, addr, rdma_addr_size(addr));
+	mc->context = context;
+	mc->id_priv = id_priv;
+	mc->join_state = join_state;
+
+	if (rdma_protocol_roce(id->device, id->port_num)) {
+		ret = cma_iboe_join_multicast(id_priv, mc);
+		if (ret)
+			goto out_err;
+	} else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
+		ret = cma_join_ib_multicast(id_priv, mc);
+		if (ret)
+			goto out_err;
+	} else {
+		ret = -ENOSYS;
+		goto out_err;
+	}
+
+	spin_lock(&id_priv->lock);
+	list_add(&mc->list, &id_priv->mc_list);
+	spin_unlock(&id_priv->lock);
+
+	return 0;
+out_err:
+	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)) != 0)
+			continue;
+		list_del(&mc->list);
+		spin_unlock_irq(&id_priv->lock);
+
+		WARN_ON(id_priv->cma_dev->device != id->device);
+		destroy_mc(id_priv, 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_work *work;
+
+	dev_addr = &id_priv->id.route.addr.dev_addr;
+
+	if ((dev_addr->bound_dev_if == ndev->ifindex) &&
+	    (net_eq(dev_net(ndev), dev_addr->net)) &&
+	    memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
+		pr_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_work_handler);
+		work->id = id_priv;
+		work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
+		cma_id_get(id_priv);
+		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 (event != NETDEV_BONDING_FAILOVER)
+		return NOTIFY_DONE;
+
+	if (!netif_is_bond_master(ndev))
+		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_send_device_removal_put(struct rdma_id_private *id_priv)
+{
+	struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL };
+	enum rdma_cm_state state;
+	unsigned long flags;
+
+	mutex_lock(&id_priv->handler_mutex);
+	/* Record that we want to remove the device */
+	spin_lock_irqsave(&id_priv->lock, flags);
+	state = id_priv->state;
+	if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) {
+		spin_unlock_irqrestore(&id_priv->lock, flags);
+		mutex_unlock(&id_priv->handler_mutex);
+		cma_id_put(id_priv);
+		return;
+	}
+	id_priv->state = RDMA_CM_DEVICE_REMOVAL;
+	spin_unlock_irqrestore(&id_priv->lock, flags);
+
+	if (cma_cm_event_handler(id_priv, &event)) {
+		/*
+		 * At this point the ULP promises it won't call
+		 * rdma_destroy_id() concurrently
+		 */
+		cma_id_put(id_priv);
+		mutex_unlock(&id_priv->handler_mutex);
+		trace_cm_id_destroy(id_priv);
+		_destroy_id(id_priv, state);
+		return;
+	}
+	mutex_unlock(&id_priv->handler_mutex);
+
+	/*
+	 * If this races with destroy then the thread that first assigns state
+	 * to a destroying does the cancel.
+	 */
+	cma_cancel_operation(id_priv, state);
+	cma_id_put(id_priv);
+}
+
+static void cma_process_remove(struct cma_device *cma_dev)
+{
+	mutex_lock(&lock);
+	while (!list_empty(&cma_dev->id_list)) {
+		struct rdma_id_private *id_priv = list_first_entry(
+			&cma_dev->id_list, struct rdma_id_private, list);
+
+		list_del(&id_priv->listen_list);
+		list_del_init(&id_priv->list);
+		cma_id_get(id_priv);
+		mutex_unlock(&lock);
+
+		cma_send_device_removal_put(id_priv);
+
+		mutex_lock(&lock);
+	}
+	mutex_unlock(&lock);
+
+	cma_dev_put(cma_dev);
+	wait_for_completion(&cma_dev->comp);
+}
+
+static int cma_add_one(struct ib_device *device)
+{
+	struct rdma_id_private *to_destroy;
+	struct cma_device *cma_dev;
+	struct rdma_id_private *id_priv;
+	unsigned int i;
+	unsigned long supported_gids = 0;
+	int ret;
+
+	cma_dev = kmalloc(sizeof(*cma_dev), GFP_KERNEL);
+	if (!cma_dev)
+		return -ENOMEM;
+
+	cma_dev->device = device;
+	cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
+					    sizeof(*cma_dev->default_gid_type),
+					    GFP_KERNEL);
+	if (!cma_dev->default_gid_type) {
+		ret = -ENOMEM;
+		goto free_cma_dev;
+	}
+
+	cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
+					    sizeof(*cma_dev->default_roce_tos),
+					    GFP_KERNEL);
+	if (!cma_dev->default_roce_tos) {
+		ret = -ENOMEM;
+		goto free_gid_type;
+	}
+
+	rdma_for_each_port (device, i) {
+		supported_gids = roce_gid_type_mask_support(device, i);
+		WARN_ON(!supported_gids);
+		if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
+			cma_dev->default_gid_type[i - rdma_start_port(device)] =
+				CMA_PREFERRED_ROCE_GID_TYPE;
+		else
+			cma_dev->default_gid_type[i - rdma_start_port(device)] =
+				find_first_bit(&supported_gids, BITS_PER_LONG);
+		cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
+	}
+
+	init_completion(&cma_dev->comp);
+	refcount_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) {
+		ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
+		if (ret)
+			goto free_listen;
+	}
+	mutex_unlock(&lock);
+
+	trace_cm_add_one(device);
+	return 0;
+
+free_listen:
+	list_del(&cma_dev->list);
+	mutex_unlock(&lock);
+
+	/* cma_process_remove() will delete to_destroy */
+	cma_process_remove(cma_dev);
+	kfree(cma_dev->default_roce_tos);
+free_gid_type:
+	kfree(cma_dev->default_gid_type);
+
+free_cma_dev:
+	kfree(cma_dev);
+	return ret;
+}
+
+static void cma_remove_one(struct ib_device *device, void *client_data)
+{
+	struct cma_device *cma_dev = client_data;
+
+	trace_cm_remove_one(device);
+
+	mutex_lock(&lock);
+	list_del(&cma_dev->list);
+	mutex_unlock(&lock);
+
+	cma_process_remove(cma_dev);
+	kfree(cma_dev->default_roce_tos);
+	kfree(cma_dev->default_gid_type);
+	kfree(cma_dev);
+}
+
+static int cma_init_net(struct net *net)
+{
+	struct cma_pernet *pernet = cma_pernet(net);
+
+	xa_init(&pernet->tcp_ps);
+	xa_init(&pernet->udp_ps);
+	xa_init(&pernet->ipoib_ps);
+	xa_init(&pernet->ib_ps);
+
+	return 0;
+}
+
+static void cma_exit_net(struct net *net)
+{
+	struct cma_pernet *pernet = cma_pernet(net);
+
+	WARN_ON(!xa_empty(&pernet->tcp_ps));
+	WARN_ON(!xa_empty(&pernet->udp_ps));
+	WARN_ON(!xa_empty(&pernet->ipoib_ps));
+	WARN_ON(!xa_empty(&pernet->ib_ps));
+}
+
+static struct pernet_operations cma_pernet_operations = {
+	.init = cma_init_net,
+	.exit = cma_exit_net,
+	.id = &cma_pernet_id,
+	.size = sizeof(struct cma_pernet),
+};
+
+static int __init cma_init(void)
+{
+	int ret;
+
+	/*
+	 * There is a rare lock ordering dependency in cma_netdev_callback()
+	 * that only happens when bonding is enabled. Teach lockdep that rtnl
+	 * must never be nested under lock so it can find these without having
+	 * to test with bonding.
+	 */
+	if (IS_ENABLED(CONFIG_LOCKDEP)) {
+		rtnl_lock();
+		mutex_lock(&lock);
+		mutex_unlock(&lock);
+		rtnl_unlock();
+	}
+
+	cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
+	if (!cma_wq)
+		return -ENOMEM;
+
+	ret = register_pernet_subsys(&cma_pernet_operations);
+	if (ret)
+		goto err_wq;
+
+	ib_sa_register_client(&sa_client);
+	register_netdevice_notifier(&cma_nb);
+
+	ret = ib_register_client(&cma_client);
+	if (ret)
+		goto err;
+
+	ret = cma_configfs_init();
+	if (ret)
+		goto err_ib;
+
+	return 0;
+
+err_ib:
+	ib_unregister_client(&cma_client);
+err:
+	unregister_netdevice_notifier(&cma_nb);
+	ib_sa_unregister_client(&sa_client);
+	unregister_pernet_subsys(&cma_pernet_operations);
+err_wq:
+	destroy_workqueue(cma_wq);
+	return ret;
+}
+
+static void __exit cma_cleanup(void)
+{
+	cma_configfs_exit();
+	ib_unregister_client(&cma_client);
+	unregister_netdevice_notifier(&cma_nb);
+	ib_sa_unregister_client(&sa_client);
+	unregister_pernet_subsys(&cma_pernet_operations);
+	destroy_workqueue(cma_wq);
+}
+
+module_init(cma_init);
+module_exit(cma_cleanup);