Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 2609 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
new file mode 100644
index 000000000..d0c35eb68
--- /dev/null
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -0,0 +1,2609 @@
+/*
+ * Copyright (c) 2004 Topspin Communications.  All rights reserved.
+ * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
+ * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "ipoib.h"
+
+#include <linux/module.h>
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/vmalloc.h>
+
+#include <linux/if_arp.h>	/* For ARPHRD_xxx */
+
+#include <linux/ip.h>
+#include <linux/in.h>
+
+#include <linux/jhash.h>
+#include <net/arp.h>
+#include <net/addrconf.h>
+#include <linux/inetdevice.h>
+#include <rdma/ib_cache.h>
+
+#define DRV_VERSION "1.0.0"
+
+const char ipoib_driver_version[] = DRV_VERSION;
+
+MODULE_AUTHOR("Roland Dreier");
+MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
+int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
+
+module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
+MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
+module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
+MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
+
+#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
+int ipoib_debug_level;
+
+module_param_named(debug_level, ipoib_debug_level, int, 0644);
+MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
+#endif
+
+struct ipoib_path_iter {
+	struct net_device *dev;
+	struct ipoib_path  path;
+};
+
+static const u8 ipv4_bcast_addr[] = {
+	0x00, 0xff, 0xff, 0xff,
+	0xff, 0x12, 0x40, 0x1b,	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,	0xff, 0xff, 0xff, 0xff
+};
+
+struct workqueue_struct *ipoib_workqueue;
+
+struct ib_sa_client ipoib_sa_client;
+
+static void ipoib_add_one(struct ib_device *device);
+static void ipoib_remove_one(struct ib_device *device, void *client_data);
+static void ipoib_neigh_reclaim(struct rcu_head *rp);
+static struct net_device *ipoib_get_net_dev_by_params(
+		struct ib_device *dev, u8 port, u16 pkey,
+		const union ib_gid *gid, const struct sockaddr *addr,
+		void *client_data);
+static int ipoib_set_mac(struct net_device *dev, void *addr);
+static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
+		       int cmd);
+
+static struct ib_client ipoib_client = {
+	.name   = "ipoib",
+	.add    = ipoib_add_one,
+	.remove = ipoib_remove_one,
+	.get_net_dev_by_params = ipoib_get_net_dev_by_params,
+};
+
+#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
+static int ipoib_netdev_event(struct notifier_block *this,
+			      unsigned long event, void *ptr)
+{
+	struct netdev_notifier_info *ni = ptr;
+	struct net_device *dev = ni->dev;
+
+	if (dev->netdev_ops->ndo_open != ipoib_open)
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_REGISTER:
+		ipoib_create_debug_files(dev);
+		break;
+	case NETDEV_CHANGENAME:
+		ipoib_delete_debug_files(dev);
+		ipoib_create_debug_files(dev);
+		break;
+	case NETDEV_UNREGISTER:
+		ipoib_delete_debug_files(dev);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+#endif
+
+int ipoib_open(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_dbg(priv, "bringing up interface\n");
+
+	netif_carrier_off(dev);
+
+	set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
+
+	priv->sm_fullmember_sendonly_support = false;
+
+	if (ipoib_ib_dev_open(dev)) {
+		if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
+			return 0;
+		goto err_disable;
+	}
+
+	ipoib_ib_dev_up(dev);
+
+	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
+		struct ipoib_dev_priv *cpriv;
+
+		/* Bring up any child interfaces too */
+		down_read(&priv->vlan_rwsem);
+		list_for_each_entry(cpriv, &priv->child_intfs, list) {
+			int flags;
+
+			flags = cpriv->dev->flags;
+			if (flags & IFF_UP)
+				continue;
+
+			dev_change_flags(cpriv->dev, flags | IFF_UP);
+		}
+		up_read(&priv->vlan_rwsem);
+	}
+
+	netif_start_queue(dev);
+
+	return 0;
+
+err_disable:
+	clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
+
+	return -EINVAL;
+}
+
+static int ipoib_stop(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_dbg(priv, "stopping interface\n");
+
+	clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
+
+	netif_stop_queue(dev);
+
+	ipoib_ib_dev_down(dev);
+	ipoib_ib_dev_stop(dev);
+
+	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
+		struct ipoib_dev_priv *cpriv;
+
+		/* Bring down any child interfaces too */
+		down_read(&priv->vlan_rwsem);
+		list_for_each_entry(cpriv, &priv->child_intfs, list) {
+			int flags;
+
+			flags = cpriv->dev->flags;
+			if (!(flags & IFF_UP))
+				continue;
+
+			dev_change_flags(cpriv->dev, flags & ~IFF_UP);
+		}
+		up_read(&priv->vlan_rwsem);
+	}
+
+	return 0;
+}
+
+static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
+		features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
+
+	return features;
+}
+
+static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	int ret = 0;
+
+	/* dev->mtu > 2K ==> connected mode */
+	if (ipoib_cm_admin_enabled(dev)) {
+		if (new_mtu > ipoib_cm_max_mtu(dev))
+			return -EINVAL;
+
+		if (new_mtu > priv->mcast_mtu)
+			ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
+				   priv->mcast_mtu);
+
+		dev->mtu = new_mtu;
+		return 0;
+	}
+
+	if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
+	    new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
+		return -EINVAL;
+
+	priv->admin_mtu = new_mtu;
+
+	if (priv->mcast_mtu < priv->admin_mtu)
+		ipoib_dbg(priv, "MTU must be smaller than the underlying "
+				"link layer MTU - 4 (%u)\n", priv->mcast_mtu);
+
+	new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
+
+	if (priv->rn_ops->ndo_change_mtu) {
+		bool carrier_status = netif_carrier_ok(dev);
+
+		netif_carrier_off(dev);
+
+		/* notify lower level on the real mtu */
+		ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
+
+		if (carrier_status)
+			netif_carrier_on(dev);
+	} else {
+		dev->mtu = new_mtu;
+	}
+
+	return ret;
+}
+
+static void ipoib_get_stats(struct net_device *dev,
+			    struct rtnl_link_stats64 *stats)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	if (priv->rn_ops->ndo_get_stats64)
+		priv->rn_ops->ndo_get_stats64(dev, stats);
+	else
+		netdev_stats_to_stats64(stats, &dev->stats);
+}
+
+/* Called with an RCU read lock taken */
+static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
+					struct net_device *dev)
+{
+	struct net *net = dev_net(dev);
+	struct in_device *in_dev;
+	struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
+	struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
+	__be32 ret_addr;
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		in_dev = in_dev_get(dev);
+		if (!in_dev)
+			return false;
+
+		ret_addr = inet_confirm_addr(net, in_dev, 0,
+					     addr_in->sin_addr.s_addr,
+					     RT_SCOPE_HOST);
+		in_dev_put(in_dev);
+		if (ret_addr)
+			return true;
+
+		break;
+	case AF_INET6:
+		if (IS_ENABLED(CONFIG_IPV6) &&
+		    ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
+			return true;
+
+		break;
+	}
+	return false;
+}
+
+/**
+ * Find the master net_device on top of the given net_device.
+ * @dev: base IPoIB net_device
+ *
+ * Returns the master net_device with a reference held, or the same net_device
+ * if no master exists.
+ */
+static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
+{
+	struct net_device *master;
+
+	rcu_read_lock();
+	master = netdev_master_upper_dev_get_rcu(dev);
+	if (master)
+		dev_hold(master);
+	rcu_read_unlock();
+
+	if (master)
+		return master;
+
+	dev_hold(dev);
+	return dev;
+}
+
+struct ipoib_walk_data {
+	const struct sockaddr *addr;
+	struct net_device *result;
+};
+
+static int ipoib_upper_walk(struct net_device *upper, void *_data)
+{
+	struct ipoib_walk_data *data = _data;
+	int ret = 0;
+
+	if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
+		dev_hold(upper);
+		data->result = upper;
+		ret = 1;
+	}
+
+	return ret;
+}
+
+/**
+ * Find a net_device matching the given address, which is an upper device of
+ * the given net_device.
+ * @addr: IP address to look for.
+ * @dev: base IPoIB net_device
+ *
+ * If found, returns the net_device with a reference held. Otherwise return
+ * NULL.
+ */
+static struct net_device *ipoib_get_net_dev_match_addr(
+		const struct sockaddr *addr, struct net_device *dev)
+{
+	struct ipoib_walk_data data = {
+		.addr = addr,
+	};
+
+	rcu_read_lock();
+	if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
+		dev_hold(dev);
+		data.result = dev;
+		goto out;
+	}
+
+	netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data);
+out:
+	rcu_read_unlock();
+	return data.result;
+}
+
+/* returns the number of IPoIB netdevs on top a given ipoib device matching a
+ * pkey_index and address, if one exists.
+ *
+ * @found_net_dev: contains a matching net_device if the return value >= 1,
+ * with a reference held. */
+static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
+				     const union ib_gid *gid,
+				     u16 pkey_index,
+				     const struct sockaddr *addr,
+				     int nesting,
+				     struct net_device **found_net_dev)
+{
+	struct ipoib_dev_priv *child_priv;
+	struct net_device *net_dev = NULL;
+	int matches = 0;
+
+	if (priv->pkey_index == pkey_index &&
+	    (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
+		if (!addr) {
+			net_dev = ipoib_get_master_net_dev(priv->dev);
+		} else {
+			/* Verify the net_device matches the IP address, as
+			 * IPoIB child devices currently share a GID. */
+			net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
+		}
+		if (net_dev) {
+			if (!*found_net_dev)
+				*found_net_dev = net_dev;
+			else
+				dev_put(net_dev);
+			++matches;
+		}
+	}
+
+	/* Check child interfaces */
+	down_read_nested(&priv->vlan_rwsem, nesting);
+	list_for_each_entry(child_priv, &priv->child_intfs, list) {
+		matches += ipoib_match_gid_pkey_addr(child_priv, gid,
+						    pkey_index, addr,
+						    nesting + 1,
+						    found_net_dev);
+		if (matches > 1)
+			break;
+	}
+	up_read(&priv->vlan_rwsem);
+
+	return matches;
+}
+
+/* Returns the number of matching net_devs found (between 0 and 2). Also
+ * return the matching net_device in the @net_dev parameter, holding a
+ * reference to the net_device, if the number of matches >= 1 */
+static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
+					 u16 pkey_index,
+					 const union ib_gid *gid,
+					 const struct sockaddr *addr,
+					 struct net_device **net_dev)
+{
+	struct ipoib_dev_priv *priv;
+	int matches = 0;
+
+	*net_dev = NULL;
+
+	list_for_each_entry(priv, dev_list, list) {
+		if (priv->port != port)
+			continue;
+
+		matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
+						     addr, 0, net_dev);
+		if (matches > 1)
+			break;
+	}
+
+	return matches;
+}
+
+static struct net_device *ipoib_get_net_dev_by_params(
+		struct ib_device *dev, u8 port, u16 pkey,
+		const union ib_gid *gid, const struct sockaddr *addr,
+		void *client_data)
+{
+	struct net_device *net_dev;
+	struct list_head *dev_list = client_data;
+	u16 pkey_index;
+	int matches;
+	int ret;
+
+	if (!rdma_protocol_ib(dev, port))
+		return NULL;
+
+	ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
+	if (ret)
+		return NULL;
+
+	if (!dev_list)
+		return NULL;
+
+	/* See if we can find a unique device matching the L2 parameters */
+	matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
+						gid, NULL, &net_dev);
+
+	switch (matches) {
+	case 0:
+		return NULL;
+	case 1:
+		return net_dev;
+	}
+
+	dev_put(net_dev);
+
+	/* Couldn't find a unique device with L2 parameters only. Use L3
+	 * address to uniquely match the net device */
+	matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
+						gid, addr, &net_dev);
+	switch (matches) {
+	case 0:
+		return NULL;
+	default:
+		dev_warn_ratelimited(&dev->dev,
+				     "duplicate IP address detected\n");
+		/* Fall through */
+	case 1:
+		return net_dev;
+	}
+}
+
+int ipoib_set_mode(struct net_device *dev, const char *buf)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
+	     !strcmp(buf, "connected\n")) ||
+	     (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
+	     !strcmp(buf, "datagram\n"))) {
+		return 0;
+	}
+
+	/* flush paths if we switch modes so that connections are restarted */
+	if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
+		set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
+		ipoib_warn(priv, "enabling connected mode "
+			   "will cause multicast packet drops\n");
+		netdev_update_features(dev);
+		dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
+		rtnl_unlock();
+		priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
+
+		ipoib_flush_paths(dev);
+		return (!rtnl_trylock()) ? -EBUSY : 0;
+	}
+
+	if (!strcmp(buf, "datagram\n")) {
+		clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
+		netdev_update_features(dev);
+		dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
+		rtnl_unlock();
+		ipoib_flush_paths(dev);
+		return (!rtnl_trylock()) ? -EBUSY : 0;
+	}
+
+	return -EINVAL;
+}
+
+struct ipoib_path *__path_find(struct net_device *dev, void *gid)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct rb_node *n = priv->path_tree.rb_node;
+	struct ipoib_path *path;
+	int ret;
+
+	while (n) {
+		path = rb_entry(n, struct ipoib_path, rb_node);
+
+		ret = memcmp(gid, path->pathrec.dgid.raw,
+			     sizeof (union ib_gid));
+
+		if (ret < 0)
+			n = n->rb_left;
+		else if (ret > 0)
+			n = n->rb_right;
+		else
+			return path;
+	}
+
+	return NULL;
+}
+
+static int __path_add(struct net_device *dev, struct ipoib_path *path)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct rb_node **n = &priv->path_tree.rb_node;
+	struct rb_node *pn = NULL;
+	struct ipoib_path *tpath;
+	int ret;
+
+	while (*n) {
+		pn = *n;
+		tpath = rb_entry(pn, struct ipoib_path, rb_node);
+
+		ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
+			     sizeof (union ib_gid));
+		if (ret < 0)
+			n = &pn->rb_left;
+		else if (ret > 0)
+			n = &pn->rb_right;
+		else
+			return -EEXIST;
+	}
+
+	rb_link_node(&path->rb_node, pn, n);
+	rb_insert_color(&path->rb_node, &priv->path_tree);
+
+	list_add_tail(&path->list, &priv->path_list);
+
+	return 0;
+}
+
+static void path_free(struct net_device *dev, struct ipoib_path *path)
+{
+	struct sk_buff *skb;
+
+	while ((skb = __skb_dequeue(&path->queue)))
+		dev_kfree_skb_irq(skb);
+
+	ipoib_dbg(ipoib_priv(dev), "path_free\n");
+
+	/* remove all neigh connected to this path */
+	ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
+
+	if (path->ah)
+		ipoib_put_ah(path->ah);
+
+	kfree(path);
+}
+
+#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
+
+struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
+{
+	struct ipoib_path_iter *iter;
+
+	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+	if (!iter)
+		return NULL;
+
+	iter->dev = dev;
+	memset(iter->path.pathrec.dgid.raw, 0, 16);
+
+	if (ipoib_path_iter_next(iter)) {
+		kfree(iter);
+		return NULL;
+	}
+
+	return iter;
+}
+
+int ipoib_path_iter_next(struct ipoib_path_iter *iter)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
+	struct rb_node *n;
+	struct ipoib_path *path;
+	int ret = 1;
+
+	spin_lock_irq(&priv->lock);
+
+	n = rb_first(&priv->path_tree);
+
+	while (n) {
+		path = rb_entry(n, struct ipoib_path, rb_node);
+
+		if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
+			   sizeof (union ib_gid)) < 0) {
+			iter->path = *path;
+			ret = 0;
+			break;
+		}
+
+		n = rb_next(n);
+	}
+
+	spin_unlock_irq(&priv->lock);
+
+	return ret;
+}
+
+void ipoib_path_iter_read(struct ipoib_path_iter *iter,
+			  struct ipoib_path *path)
+{
+	*path = iter->path;
+}
+
+#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
+
+void ipoib_mark_paths_invalid(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_path *path, *tp;
+
+	spin_lock_irq(&priv->lock);
+
+	list_for_each_entry_safe(path, tp, &priv->path_list, list) {
+		ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
+			  be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
+			  path->pathrec.dgid.raw);
+		if (path->ah)
+			path->ah->valid = 0;
+	}
+
+	spin_unlock_irq(&priv->lock);
+}
+
+static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
+{
+	struct ipoib_pseudo_header *phdr;
+
+	phdr = skb_push(skb, sizeof(*phdr));
+	memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
+}
+
+void ipoib_flush_paths(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_path *path, *tp;
+	LIST_HEAD(remove_list);
+	unsigned long flags;
+
+	netif_tx_lock_bh(dev);
+	spin_lock_irqsave(&priv->lock, flags);
+
+	list_splice_init(&priv->path_list, &remove_list);
+
+	list_for_each_entry(path, &remove_list, list)
+		rb_erase(&path->rb_node, &priv->path_tree);
+
+	list_for_each_entry_safe(path, tp, &remove_list, list) {
+		if (path->query)
+			ib_sa_cancel_query(path->query_id, path->query);
+		spin_unlock_irqrestore(&priv->lock, flags);
+		netif_tx_unlock_bh(dev);
+		wait_for_completion(&path->done);
+		path_free(dev, path);
+		netif_tx_lock_bh(dev);
+		spin_lock_irqsave(&priv->lock, flags);
+	}
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+	netif_tx_unlock_bh(dev);
+}
+
+static void path_rec_completion(int status,
+				struct sa_path_rec *pathrec,
+				void *path_ptr)
+{
+	struct ipoib_path *path = path_ptr;
+	struct net_device *dev = path->dev;
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_ah *ah = NULL;
+	struct ipoib_ah *old_ah = NULL;
+	struct ipoib_neigh *neigh, *tn;
+	struct sk_buff_head skqueue;
+	struct sk_buff *skb;
+	unsigned long flags;
+
+	if (!status)
+		ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
+			  be32_to_cpu(sa_path_get_dlid(pathrec)),
+			  pathrec->dgid.raw);
+	else
+		ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
+			  status, path->pathrec.dgid.raw);
+
+	skb_queue_head_init(&skqueue);
+
+	if (!status) {
+		struct rdma_ah_attr av;
+
+		if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
+					       pathrec, &av, NULL)) {
+			ah = ipoib_create_ah(dev, priv->pd, &av);
+			rdma_destroy_ah_attr(&av);
+		}
+	}
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	if (!IS_ERR_OR_NULL(ah)) {
+		/*
+		 * pathrec.dgid is used as the database key from the LLADDR,
+		 * it must remain unchanged even if the SA returns a different
+		 * GID to use in the AH.
+		 */
+		if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
+			   sizeof(union ib_gid))) {
+			ipoib_dbg(
+				priv,
+				"%s got PathRec for gid %pI6 while asked for %pI6\n",
+				dev->name, pathrec->dgid.raw,
+				path->pathrec.dgid.raw);
+			memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
+			       sizeof(union ib_gid));
+		}
+
+		path->pathrec = *pathrec;
+
+		old_ah   = path->ah;
+		path->ah = ah;
+
+		ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
+			  ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
+			  pathrec->sl);
+
+		while ((skb = __skb_dequeue(&path->queue)))
+			__skb_queue_tail(&skqueue, skb);
+
+		list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
+			if (neigh->ah) {
+				WARN_ON(neigh->ah != old_ah);
+				/*
+				 * Dropping the ah reference inside
+				 * priv->lock is safe here, because we
+				 * will hold one more reference from
+				 * the original value of path->ah (ie
+				 * old_ah).
+				 */
+				ipoib_put_ah(neigh->ah);
+			}
+			kref_get(&path->ah->ref);
+			neigh->ah = path->ah;
+
+			if (ipoib_cm_enabled(dev, neigh->daddr)) {
+				if (!ipoib_cm_get(neigh))
+					ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
+									       path,
+									       neigh));
+				if (!ipoib_cm_get(neigh)) {
+					ipoib_neigh_free(neigh);
+					continue;
+				}
+			}
+
+			while ((skb = __skb_dequeue(&neigh->queue)))
+				__skb_queue_tail(&skqueue, skb);
+		}
+		path->ah->valid = 1;
+	}
+
+	path->query = NULL;
+	complete(&path->done);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	if (IS_ERR_OR_NULL(ah))
+		ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
+
+	if (old_ah)
+		ipoib_put_ah(old_ah);
+
+	while ((skb = __skb_dequeue(&skqueue))) {
+		int ret;
+		skb->dev = dev;
+		ret = dev_queue_xmit(skb);
+		if (ret)
+			ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
+				   __func__, ret);
+	}
+}
+
+static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
+			  void *gid)
+{
+	path->dev = priv->dev;
+
+	if (rdma_cap_opa_ah(priv->ca, priv->port))
+		path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
+	else
+		path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
+
+	memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
+	path->pathrec.sgid	    = priv->local_gid;
+	path->pathrec.pkey	    = cpu_to_be16(priv->pkey);
+	path->pathrec.numb_path     = 1;
+	path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
+}
+
+static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_path *path;
+
+	if (!priv->broadcast)
+		return NULL;
+
+	path = kzalloc(sizeof(*path), GFP_ATOMIC);
+	if (!path)
+		return NULL;
+
+	skb_queue_head_init(&path->queue);
+
+	INIT_LIST_HEAD(&path->neigh_list);
+
+	init_path_rec(priv, path, gid);
+
+	return path;
+}
+
+static int path_rec_start(struct net_device *dev,
+			  struct ipoib_path *path)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_dbg(priv, "Start path record lookup for %pI6\n",
+		  path->pathrec.dgid.raw);
+
+	init_completion(&path->done);
+
+	path->query_id =
+		ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
+				   &path->pathrec,
+				   IB_SA_PATH_REC_DGID		|
+				   IB_SA_PATH_REC_SGID		|
+				   IB_SA_PATH_REC_NUMB_PATH	|
+				   IB_SA_PATH_REC_TRAFFIC_CLASS |
+				   IB_SA_PATH_REC_PKEY,
+				   1000, GFP_ATOMIC,
+				   path_rec_completion,
+				   path, &path->query);
+	if (path->query_id < 0) {
+		ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
+		path->query = NULL;
+		complete(&path->done);
+		return path->query_id;
+	}
+
+	return 0;
+}
+
+static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
+			       struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_path *path;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	path = __path_find(dev, daddr + 4);
+	if (!path)
+		goto out;
+	if (!path->query)
+		path_rec_start(dev, path);
+out:
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
+					  struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct rdma_netdev *rn = netdev_priv(dev);
+	struct ipoib_path *path;
+	struct ipoib_neigh *neigh;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	neigh = ipoib_neigh_alloc(daddr, dev);
+	if (!neigh) {
+		spin_unlock_irqrestore(&priv->lock, flags);
+		++dev->stats.tx_dropped;
+		dev_kfree_skb_any(skb);
+		return NULL;
+	}
+
+	/* To avoid race condition, make sure that the
+	 * neigh will be added only once.
+	 */
+	if (unlikely(!list_empty(&neigh->list))) {
+		spin_unlock_irqrestore(&priv->lock, flags);
+		return neigh;
+	}
+
+	path = __path_find(dev, daddr + 4);
+	if (!path) {
+		path = path_rec_create(dev, daddr + 4);
+		if (!path)
+			goto err_path;
+
+		__path_add(dev, path);
+	}
+
+	list_add_tail(&neigh->list, &path->neigh_list);
+
+	if (path->ah && path->ah->valid) {
+		kref_get(&path->ah->ref);
+		neigh->ah = path->ah;
+
+		if (ipoib_cm_enabled(dev, neigh->daddr)) {
+			if (!ipoib_cm_get(neigh))
+				ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
+			if (!ipoib_cm_get(neigh)) {
+				ipoib_neigh_free(neigh);
+				goto err_drop;
+			}
+			if (skb_queue_len(&neigh->queue) <
+			    IPOIB_MAX_PATH_REC_QUEUE) {
+				push_pseudo_header(skb, neigh->daddr);
+				__skb_queue_tail(&neigh->queue, skb);
+			} else {
+				ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
+					   skb_queue_len(&neigh->queue));
+				goto err_drop;
+			}
+		} else {
+			spin_unlock_irqrestore(&priv->lock, flags);
+			path->ah->last_send = rn->send(dev, skb, path->ah->ah,
+						       IPOIB_QPN(daddr));
+			ipoib_neigh_put(neigh);
+			return NULL;
+		}
+	} else {
+		neigh->ah  = NULL;
+
+		if (!path->query && path_rec_start(dev, path))
+			goto err_path;
+		if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
+			push_pseudo_header(skb, neigh->daddr);
+			__skb_queue_tail(&neigh->queue, skb);
+		} else {
+			goto err_drop;
+		}
+	}
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+	ipoib_neigh_put(neigh);
+	return NULL;
+
+err_path:
+	ipoib_neigh_free(neigh);
+err_drop:
+	++dev->stats.tx_dropped;
+	dev_kfree_skb_any(skb);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+	ipoib_neigh_put(neigh);
+
+	return NULL;
+}
+
+static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
+			     struct ipoib_pseudo_header *phdr)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct rdma_netdev *rn = netdev_priv(dev);
+	struct ipoib_path *path;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	/* no broadcast means that all paths are (going to be) not valid */
+	if (!priv->broadcast)
+		goto drop_and_unlock;
+
+	path = __path_find(dev, phdr->hwaddr + 4);
+	if (!path || !path->ah || !path->ah->valid) {
+		if (!path) {
+			path = path_rec_create(dev, phdr->hwaddr + 4);
+			if (!path)
+				goto drop_and_unlock;
+			__path_add(dev, path);
+		} else {
+			/*
+			 * make sure there are no changes in the existing
+			 * path record
+			 */
+			init_path_rec(priv, path, phdr->hwaddr + 4);
+		}
+		if (!path->query && path_rec_start(dev, path)) {
+			goto drop_and_unlock;
+		}
+
+		if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
+			push_pseudo_header(skb, phdr->hwaddr);
+			__skb_queue_tail(&path->queue, skb);
+			goto unlock;
+		} else {
+			goto drop_and_unlock;
+		}
+	}
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+	ipoib_dbg(priv, "Send unicast ARP to %08x\n",
+		  be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
+	path->ah->last_send = rn->send(dev, skb, path->ah->ah,
+				       IPOIB_QPN(phdr->hwaddr));
+	return;
+
+drop_and_unlock:
+	++dev->stats.tx_dropped;
+	dev_kfree_skb_any(skb);
+unlock:
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct rdma_netdev *rn = netdev_priv(dev);
+	struct ipoib_neigh *neigh;
+	struct ipoib_pseudo_header *phdr;
+	struct ipoib_header *header;
+	unsigned long flags;
+
+	phdr = (struct ipoib_pseudo_header *) skb->data;
+	skb_pull(skb, sizeof(*phdr));
+	header = (struct ipoib_header *) skb->data;
+
+	if (unlikely(phdr->hwaddr[4] == 0xff)) {
+		/* multicast, arrange "if" according to probability */
+		if ((header->proto != htons(ETH_P_IP)) &&
+		    (header->proto != htons(ETH_P_IPV6)) &&
+		    (header->proto != htons(ETH_P_ARP)) &&
+		    (header->proto != htons(ETH_P_RARP)) &&
+		    (header->proto != htons(ETH_P_TIPC))) {
+			/* ethertype not supported by IPoIB */
+			++dev->stats.tx_dropped;
+			dev_kfree_skb_any(skb);
+			return NETDEV_TX_OK;
+		}
+		/* Add in the P_Key for multicast*/
+		phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
+		phdr->hwaddr[9] = priv->pkey & 0xff;
+
+		neigh = ipoib_neigh_get(dev, phdr->hwaddr);
+		if (likely(neigh))
+			goto send_using_neigh;
+		ipoib_mcast_send(dev, phdr->hwaddr, skb);
+		return NETDEV_TX_OK;
+	}
+
+	/* unicast, arrange "switch" according to probability */
+	switch (header->proto) {
+	case htons(ETH_P_IP):
+	case htons(ETH_P_IPV6):
+	case htons(ETH_P_TIPC):
+		neigh = ipoib_neigh_get(dev, phdr->hwaddr);
+		if (unlikely(!neigh)) {
+			neigh = neigh_add_path(skb, phdr->hwaddr, dev);
+			if (likely(!neigh))
+				return NETDEV_TX_OK;
+		}
+		break;
+	case htons(ETH_P_ARP):
+	case htons(ETH_P_RARP):
+		/* for unicast ARP and RARP should always perform path find */
+		unicast_arp_send(skb, dev, phdr);
+		return NETDEV_TX_OK;
+	default:
+		/* ethertype not supported by IPoIB */
+		++dev->stats.tx_dropped;
+		dev_kfree_skb_any(skb);
+		return NETDEV_TX_OK;
+	}
+
+send_using_neigh:
+	/* note we now hold a ref to neigh */
+	if (ipoib_cm_get(neigh)) {
+		if (ipoib_cm_up(neigh)) {
+			ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
+			goto unref;
+		}
+	} else if (neigh->ah && neigh->ah->valid) {
+		neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
+						IPOIB_QPN(phdr->hwaddr));
+		goto unref;
+	} else if (neigh->ah) {
+		neigh_refresh_path(neigh, phdr->hwaddr, dev);
+	}
+
+	if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
+		push_pseudo_header(skb, phdr->hwaddr);
+		spin_lock_irqsave(&priv->lock, flags);
+		__skb_queue_tail(&neigh->queue, skb);
+		spin_unlock_irqrestore(&priv->lock, flags);
+	} else {
+		++dev->stats.tx_dropped;
+		dev_kfree_skb_any(skb);
+	}
+
+unref:
+	ipoib_neigh_put(neigh);
+
+	return NETDEV_TX_OK;
+}
+
+static void ipoib_timeout(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
+		   jiffies_to_msecs(jiffies - dev_trans_start(dev)));
+	ipoib_warn(priv,
+		   "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n",
+		   netif_queue_stopped(dev), priv->tx_head, priv->tx_tail,
+		   priv->global_tx_head, priv->global_tx_tail);
+
+	/* XXX reset QP, etc. */
+}
+
+static int ipoib_hard_header(struct sk_buff *skb,
+			     struct net_device *dev,
+			     unsigned short type,
+			     const void *daddr,
+			     const void *saddr,
+			     unsigned int len)
+{
+	struct ipoib_header *header;
+
+	header = skb_push(skb, sizeof(*header));
+
+	header->proto = htons(type);
+	header->reserved = 0;
+
+	/*
+	 * we don't rely on dst_entry structure,  always stuff the
+	 * destination address into skb hard header so we can figure out where
+	 * to send the packet later.
+	 */
+	push_pseudo_header(skb, daddr);
+
+	return IPOIB_HARD_LEN;
+}
+
+static void ipoib_set_mcast_list(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
+		ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
+		return;
+	}
+
+	queue_work(priv->wq, &priv->restart_task);
+}
+
+static int ipoib_get_iflink(const struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	/* parent interface */
+	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
+		return dev->ifindex;
+
+	/* child/vlan interface */
+	return priv->parent->ifindex;
+}
+
+static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
+{
+	/*
+	 * Use only the address parts that contributes to spreading
+	 * The subnet prefix is not used as one can not connect to
+	 * same remote port (GUID) using the same remote QPN via two
+	 * different subnets.
+	 */
+	 /* qpn octets[1:4) & port GUID octets[12:20) */
+	u32 *d32 = (u32 *) daddr;
+	u32 hv;
+
+	hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
+	return hv & htbl->mask;
+}
+
+struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_neigh_table *ntbl = &priv->ntbl;
+	struct ipoib_neigh_hash *htbl;
+	struct ipoib_neigh *neigh = NULL;
+	u32 hash_val;
+
+	rcu_read_lock_bh();
+
+	htbl = rcu_dereference_bh(ntbl->htbl);
+
+	if (!htbl)
+		goto out_unlock;
+
+	hash_val = ipoib_addr_hash(htbl, daddr);
+	for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
+	     neigh != NULL;
+	     neigh = rcu_dereference_bh(neigh->hnext)) {
+		if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
+			/* found, take one ref on behalf of the caller */
+			if (!atomic_inc_not_zero(&neigh->refcnt)) {
+				/* deleted */
+				neigh = NULL;
+				goto out_unlock;
+			}
+
+			if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
+				neigh->alive = jiffies;
+			goto out_unlock;
+		}
+	}
+
+out_unlock:
+	rcu_read_unlock_bh();
+	return neigh;
+}
+
+static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
+{
+	struct ipoib_neigh_table *ntbl = &priv->ntbl;
+	struct ipoib_neigh_hash *htbl;
+	unsigned long neigh_obsolete;
+	unsigned long dt;
+	unsigned long flags;
+	int i;
+	LIST_HEAD(remove_list);
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	htbl = rcu_dereference_protected(ntbl->htbl,
+					 lockdep_is_held(&priv->lock));
+
+	if (!htbl)
+		goto out_unlock;
+
+	/* neigh is obsolete if it was idle for two GC periods */
+	dt = 2 * arp_tbl.gc_interval;
+	neigh_obsolete = jiffies - dt;
+
+	for (i = 0; i < htbl->size; i++) {
+		struct ipoib_neigh *neigh;
+		struct ipoib_neigh __rcu **np = &htbl->buckets[i];
+
+		while ((neigh = rcu_dereference_protected(*np,
+							  lockdep_is_held(&priv->lock))) != NULL) {
+			/* was the neigh idle for two GC periods */
+			if (time_after(neigh_obsolete, neigh->alive)) {
+
+				ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
+
+				rcu_assign_pointer(*np,
+						   rcu_dereference_protected(neigh->hnext,
+									     lockdep_is_held(&priv->lock)));
+				/* remove from path/mc list */
+				list_del_init(&neigh->list);
+				call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
+			} else {
+				np = &neigh->hnext;
+			}
+
+		}
+	}
+
+out_unlock:
+	spin_unlock_irqrestore(&priv->lock, flags);
+	ipoib_mcast_remove_list(&remove_list);
+}
+
+static void ipoib_reap_neigh(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv =
+		container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
+
+	__ipoib_reap_neigh(priv);
+
+	queue_delayed_work(priv->wq, &priv->neigh_reap_task,
+			   arp_tbl.gc_interval);
+}
+
+
+static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
+				      struct net_device *dev)
+{
+	struct ipoib_neigh *neigh;
+
+	neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC);
+	if (!neigh)
+		return NULL;
+
+	neigh->dev = dev;
+	memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
+	skb_queue_head_init(&neigh->queue);
+	INIT_LIST_HEAD(&neigh->list);
+	ipoib_cm_set(neigh, NULL);
+	/* one ref on behalf of the caller */
+	atomic_set(&neigh->refcnt, 1);
+
+	return neigh;
+}
+
+struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
+				      struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_neigh_table *ntbl = &priv->ntbl;
+	struct ipoib_neigh_hash *htbl;
+	struct ipoib_neigh *neigh;
+	u32 hash_val;
+
+	htbl = rcu_dereference_protected(ntbl->htbl,
+					 lockdep_is_held(&priv->lock));
+	if (!htbl) {
+		neigh = NULL;
+		goto out_unlock;
+	}
+
+	/* need to add a new neigh, but maybe some other thread succeeded?
+	 * recalc hash, maybe hash resize took place so we do a search
+	 */
+	hash_val = ipoib_addr_hash(htbl, daddr);
+	for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
+					       lockdep_is_held(&priv->lock));
+	     neigh != NULL;
+	     neigh = rcu_dereference_protected(neigh->hnext,
+					       lockdep_is_held(&priv->lock))) {
+		if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
+			/* found, take one ref on behalf of the caller */
+			if (!atomic_inc_not_zero(&neigh->refcnt)) {
+				/* deleted */
+				neigh = NULL;
+				break;
+			}
+			neigh->alive = jiffies;
+			goto out_unlock;
+		}
+	}
+
+	neigh = ipoib_neigh_ctor(daddr, dev);
+	if (!neigh)
+		goto out_unlock;
+
+	/* one ref on behalf of the hash table */
+	atomic_inc(&neigh->refcnt);
+	neigh->alive = jiffies;
+	/* put in hash */
+	rcu_assign_pointer(neigh->hnext,
+			   rcu_dereference_protected(htbl->buckets[hash_val],
+						     lockdep_is_held(&priv->lock)));
+	rcu_assign_pointer(htbl->buckets[hash_val], neigh);
+	atomic_inc(&ntbl->entries);
+
+out_unlock:
+
+	return neigh;
+}
+
+void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
+{
+	/* neigh reference count was dropprd to zero */
+	struct net_device *dev = neigh->dev;
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct sk_buff *skb;
+	if (neigh->ah)
+		ipoib_put_ah(neigh->ah);
+	while ((skb = __skb_dequeue(&neigh->queue))) {
+		++dev->stats.tx_dropped;
+		dev_kfree_skb_any(skb);
+	}
+	if (ipoib_cm_get(neigh))
+		ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
+	ipoib_dbg(ipoib_priv(dev),
+		  "neigh free for %06x %pI6\n",
+		  IPOIB_QPN(neigh->daddr),
+		  neigh->daddr + 4);
+	kfree(neigh);
+	if (atomic_dec_and_test(&priv->ntbl.entries)) {
+		if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
+			complete(&priv->ntbl.flushed);
+	}
+}
+
+static void ipoib_neigh_reclaim(struct rcu_head *rp)
+{
+	/* Called as a result of removal from hash table */
+	struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
+	/* note TX context may hold another ref */
+	ipoib_neigh_put(neigh);
+}
+
+void ipoib_neigh_free(struct ipoib_neigh *neigh)
+{
+	struct net_device *dev = neigh->dev;
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_neigh_table *ntbl = &priv->ntbl;
+	struct ipoib_neigh_hash *htbl;
+	struct ipoib_neigh __rcu **np;
+	struct ipoib_neigh *n;
+	u32 hash_val;
+
+	htbl = rcu_dereference_protected(ntbl->htbl,
+					lockdep_is_held(&priv->lock));
+	if (!htbl)
+		return;
+
+	hash_val = ipoib_addr_hash(htbl, neigh->daddr);
+	np = &htbl->buckets[hash_val];
+	for (n = rcu_dereference_protected(*np,
+					    lockdep_is_held(&priv->lock));
+	     n != NULL;
+	     n = rcu_dereference_protected(*np,
+					lockdep_is_held(&priv->lock))) {
+		if (n == neigh) {
+			/* found */
+			rcu_assign_pointer(*np,
+					   rcu_dereference_protected(neigh->hnext,
+								     lockdep_is_held(&priv->lock)));
+			/* remove from parent list */
+			list_del_init(&neigh->list);
+			call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
+			return;
+		} else {
+			np = &n->hnext;
+		}
+	}
+}
+
+static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
+{
+	struct ipoib_neigh_table *ntbl = &priv->ntbl;
+	struct ipoib_neigh_hash *htbl;
+	struct ipoib_neigh __rcu **buckets;
+	u32 size;
+
+	clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
+	ntbl->htbl = NULL;
+	htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
+	if (!htbl)
+		return -ENOMEM;
+	size = roundup_pow_of_two(arp_tbl.gc_thresh3);
+	buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
+	if (!buckets) {
+		kfree(htbl);
+		return -ENOMEM;
+	}
+	htbl->size = size;
+	htbl->mask = (size - 1);
+	htbl->buckets = buckets;
+	RCU_INIT_POINTER(ntbl->htbl, htbl);
+	htbl->ntbl = ntbl;
+	atomic_set(&ntbl->entries, 0);
+
+	/* start garbage collection */
+	queue_delayed_work(priv->wq, &priv->neigh_reap_task,
+			   arp_tbl.gc_interval);
+
+	return 0;
+}
+
+static void neigh_hash_free_rcu(struct rcu_head *head)
+{
+	struct ipoib_neigh_hash *htbl = container_of(head,
+						    struct ipoib_neigh_hash,
+						    rcu);
+	struct ipoib_neigh __rcu **buckets = htbl->buckets;
+	struct ipoib_neigh_table *ntbl = htbl->ntbl;
+
+	kvfree(buckets);
+	kfree(htbl);
+	complete(&ntbl->deleted);
+}
+
+void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_neigh_table *ntbl = &priv->ntbl;
+	struct ipoib_neigh_hash *htbl;
+	unsigned long flags;
+	int i;
+
+	/* remove all neigh connected to a given path or mcast */
+	spin_lock_irqsave(&priv->lock, flags);
+
+	htbl = rcu_dereference_protected(ntbl->htbl,
+					 lockdep_is_held(&priv->lock));
+
+	if (!htbl)
+		goto out_unlock;
+
+	for (i = 0; i < htbl->size; i++) {
+		struct ipoib_neigh *neigh;
+		struct ipoib_neigh __rcu **np = &htbl->buckets[i];
+
+		while ((neigh = rcu_dereference_protected(*np,
+							  lockdep_is_held(&priv->lock))) != NULL) {
+			/* delete neighs belong to this parent */
+			if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
+				rcu_assign_pointer(*np,
+						   rcu_dereference_protected(neigh->hnext,
+									     lockdep_is_held(&priv->lock)));
+				/* remove from parent list */
+				list_del_init(&neigh->list);
+				call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
+			} else {
+				np = &neigh->hnext;
+			}
+
+		}
+	}
+out_unlock:
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
+{
+	struct ipoib_neigh_table *ntbl = &priv->ntbl;
+	struct ipoib_neigh_hash *htbl;
+	unsigned long flags;
+	int i, wait_flushed = 0;
+
+	init_completion(&priv->ntbl.flushed);
+	set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	htbl = rcu_dereference_protected(ntbl->htbl,
+					lockdep_is_held(&priv->lock));
+	if (!htbl)
+		goto out_unlock;
+
+	wait_flushed = atomic_read(&priv->ntbl.entries);
+	if (!wait_flushed)
+		goto free_htbl;
+
+	for (i = 0; i < htbl->size; i++) {
+		struct ipoib_neigh *neigh;
+		struct ipoib_neigh __rcu **np = &htbl->buckets[i];
+
+		while ((neigh = rcu_dereference_protected(*np,
+				       lockdep_is_held(&priv->lock))) != NULL) {
+			rcu_assign_pointer(*np,
+					   rcu_dereference_protected(neigh->hnext,
+								     lockdep_is_held(&priv->lock)));
+			/* remove from path/mc list */
+			list_del_init(&neigh->list);
+			call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
+		}
+	}
+
+free_htbl:
+	rcu_assign_pointer(ntbl->htbl, NULL);
+	call_rcu(&htbl->rcu, neigh_hash_free_rcu);
+
+out_unlock:
+	spin_unlock_irqrestore(&priv->lock, flags);
+	if (wait_flushed)
+		wait_for_completion(&priv->ntbl.flushed);
+}
+
+static void ipoib_neigh_hash_uninit(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
+	init_completion(&priv->ntbl.deleted);
+
+	cancel_delayed_work_sync(&priv->neigh_reap_task);
+
+	ipoib_flush_neighs(priv);
+
+	wait_for_completion(&priv->ntbl.deleted);
+}
+
+static void ipoib_napi_add(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC);
+	netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE);
+}
+
+static void ipoib_napi_del(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	netif_napi_del(&priv->recv_napi);
+	netif_napi_del(&priv->send_napi);
+}
+
+static void ipoib_dev_uninit_default(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_transport_dev_cleanup(dev);
+
+	ipoib_napi_del(dev);
+
+	ipoib_cm_dev_cleanup(dev);
+
+	kfree(priv->rx_ring);
+	vfree(priv->tx_ring);
+
+	priv->rx_ring = NULL;
+	priv->tx_ring = NULL;
+}
+
+static int ipoib_dev_init_default(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_napi_add(dev);
+
+	/* Allocate RX/TX "rings" to hold queued skbs */
+	priv->rx_ring =	kcalloc(ipoib_recvq_size,
+				       sizeof(*priv->rx_ring),
+				       GFP_KERNEL);
+	if (!priv->rx_ring)
+		goto out;
+
+	priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
+					   sizeof(*priv->tx_ring)));
+	if (!priv->tx_ring) {
+		pr_warn("%s: failed to allocate TX ring (%d entries)\n",
+			priv->ca->name, ipoib_sendq_size);
+		goto out_rx_ring_cleanup;
+	}
+
+	/* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */
+
+	if (ipoib_transport_dev_init(dev, priv->ca)) {
+		pr_warn("%s: ipoib_transport_dev_init failed\n",
+			priv->ca->name);
+		goto out_tx_ring_cleanup;
+	}
+
+	/* after qp created set dev address */
+	priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
+	priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
+	priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;
+
+	return 0;
+
+out_tx_ring_cleanup:
+	vfree(priv->tx_ring);
+
+out_rx_ring_cleanup:
+	kfree(priv->rx_ring);
+
+out:
+	ipoib_napi_del(dev);
+	return -ENOMEM;
+}
+
+static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
+		       int cmd)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	if (!priv->rn_ops->ndo_do_ioctl)
+		return -EOPNOTSUPP;
+
+	return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd);
+}
+
+static int ipoib_dev_init(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	int ret = -ENOMEM;
+
+	priv->qp = NULL;
+
+	/*
+	 * the various IPoIB tasks assume they will never race against
+	 * themselves, so always use a single thread workqueue
+	 */
+	priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
+	if (!priv->wq) {
+		pr_warn("%s: failed to allocate device WQ\n", dev->name);
+		goto out;
+	}
+
+	/* create pd, which used both for control and datapath*/
+	priv->pd = ib_alloc_pd(priv->ca, 0);
+	if (IS_ERR(priv->pd)) {
+		pr_warn("%s: failed to allocate PD\n", priv->ca->name);
+		goto clean_wq;
+	}
+
+	ret = priv->rn_ops->ndo_init(dev);
+	if (ret) {
+		pr_warn("%s failed to init HW resource\n", dev->name);
+		goto out_free_pd;
+	}
+
+	ret = ipoib_neigh_hash_init(priv);
+	if (ret) {
+		pr_warn("%s failed to init neigh hash\n", dev->name);
+		goto out_dev_uninit;
+	}
+
+	if (dev->flags & IFF_UP) {
+		if (ipoib_ib_dev_open(dev)) {
+			pr_warn("%s failed to open device\n", dev->name);
+			ret = -ENODEV;
+			goto out_hash_uninit;
+		}
+	}
+
+	return 0;
+
+out_hash_uninit:
+	ipoib_neigh_hash_uninit(dev);
+
+out_dev_uninit:
+	ipoib_ib_dev_cleanup(dev);
+
+out_free_pd:
+	if (priv->pd) {
+		ib_dealloc_pd(priv->pd);
+		priv->pd = NULL;
+	}
+
+clean_wq:
+	if (priv->wq) {
+		destroy_workqueue(priv->wq);
+		priv->wq = NULL;
+	}
+
+out:
+	return ret;
+}
+
+/*
+ * This must be called before doing an unregister_netdev on a parent device to
+ * shutdown the IB event handler.
+ */
+static void ipoib_parent_unregister_pre(struct net_device *ndev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
+
+	/*
+	 * ipoib_set_mac checks netif_running before pushing work, clearing
+	 * running ensures the it will not add more work.
+	 */
+	rtnl_lock();
+	dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
+	rtnl_unlock();
+
+	/* ipoib_event() cannot be running once this returns */
+	ib_unregister_event_handler(&priv->event_handler);
+
+	/*
+	 * Work on the queue grabs the rtnl lock, so this cannot be done while
+	 * also holding it.
+	 */
+	flush_workqueue(ipoib_workqueue);
+}
+
+static void ipoib_set_dev_features(struct ipoib_dev_priv *priv)
+{
+	priv->hca_caps = priv->ca->attrs.device_cap_flags;
+
+	if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
+		priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
+
+		if (priv->hca_caps & IB_DEVICE_UD_TSO)
+			priv->dev->hw_features |= NETIF_F_TSO;
+
+		priv->dev->features |= priv->dev->hw_features;
+	}
+}
+
+static int ipoib_parent_init(struct net_device *ndev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
+	struct ib_port_attr attr;
+	int result;
+
+	result = ib_query_port(priv->ca, priv->port, &attr);
+	if (result) {
+		pr_warn("%s: ib_query_port %d failed\n", priv->ca->name,
+			priv->port);
+		return result;
+	}
+	priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
+
+	result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
+	if (result) {
+		pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
+			priv->ca->name, priv->port, result);
+		return result;
+	}
+
+	result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid);
+	if (result) {
+		pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
+			priv->ca->name, priv->port, result);
+		return result;
+	}
+	memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
+	       sizeof(union ib_gid));
+
+	SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
+	priv->dev->dev_port = priv->port - 1;
+	/* Let's set this one too for backwards compatibility. */
+	priv->dev->dev_id = priv->port - 1;
+
+	return 0;
+}
+
+static void ipoib_child_init(struct net_device *ndev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
+	struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
+
+	priv->max_ib_mtu = ppriv->max_ib_mtu;
+	set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
+	memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
+	memcpy(&priv->local_gid, &ppriv->local_gid, sizeof(priv->local_gid));
+}
+
+static int ipoib_ndo_init(struct net_device *ndev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
+	int rc;
+
+	if (priv->parent) {
+		ipoib_child_init(ndev);
+	} else {
+		rc = ipoib_parent_init(ndev);
+		if (rc)
+			return rc;
+	}
+
+	/* MTU will be reset when mcast join happens */
+	ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
+	priv->mcast_mtu = priv->admin_mtu = ndev->mtu;
+	ndev->max_mtu = IPOIB_CM_MTU;
+
+	ndev->neigh_priv_len = sizeof(struct ipoib_neigh);
+
+	/*
+	 * Set the full membership bit, so that we join the right
+	 * broadcast group, etc.
+	 */
+	priv->pkey |= 0x8000;
+
+	ndev->broadcast[8] = priv->pkey >> 8;
+	ndev->broadcast[9] = priv->pkey & 0xff;
+	set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
+
+	ipoib_set_dev_features(priv);
+
+	rc = ipoib_dev_init(ndev);
+	if (rc) {
+		pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n",
+			priv->ca->name, priv->dev->name, priv->port, rc);
+		return rc;
+	}
+
+	if (priv->parent) {
+		struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
+
+		dev_hold(priv->parent);
+
+		down_write(&ppriv->vlan_rwsem);
+		list_add_tail(&priv->list, &ppriv->child_intfs);
+		up_write(&ppriv->vlan_rwsem);
+	}
+
+	return 0;
+}
+
+static void ipoib_ndo_uninit(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ASSERT_RTNL();
+
+	/*
+	 * ipoib_remove_one guarantees the children are removed before the
+	 * parent, and that is the only place where a parent can be removed.
+	 */
+	WARN_ON(!list_empty(&priv->child_intfs));
+
+	if (priv->parent) {
+		struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
+
+		down_write(&ppriv->vlan_rwsem);
+		list_del(&priv->list);
+		up_write(&ppriv->vlan_rwsem);
+	}
+
+	ipoib_neigh_hash_uninit(dev);
+
+	ipoib_ib_dev_cleanup(dev);
+
+	/* no more works over the priv->wq */
+	if (priv->wq) {
+		/* See ipoib_mcast_carrier_on_task() */
+		WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags));
+		flush_workqueue(priv->wq);
+		destroy_workqueue(priv->wq);
+		priv->wq = NULL;
+	}
+
+	if (priv->parent)
+		dev_put(priv->parent);
+}
+
+static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
+}
+
+static int ipoib_get_vf_config(struct net_device *dev, int vf,
+			       struct ifla_vf_info *ivf)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	int err;
+
+	err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
+	if (err)
+		return err;
+
+	ivf->vf = vf;
+	memcpy(ivf->mac, dev->dev_addr, dev->addr_len);
+
+	return 0;
+}
+
+static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
+		return -EINVAL;
+
+	return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
+}
+
+static int ipoib_get_vf_stats(struct net_device *dev, int vf,
+			      struct ifla_vf_stats *vf_stats)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
+}
+
+static const struct header_ops ipoib_header_ops = {
+	.create	= ipoib_hard_header,
+};
+
+static const struct net_device_ops ipoib_netdev_ops_pf = {
+	.ndo_init		 = ipoib_ndo_init,
+	.ndo_uninit		 = ipoib_ndo_uninit,
+	.ndo_open		 = ipoib_open,
+	.ndo_stop		 = ipoib_stop,
+	.ndo_change_mtu		 = ipoib_change_mtu,
+	.ndo_fix_features	 = ipoib_fix_features,
+	.ndo_start_xmit		 = ipoib_start_xmit,
+	.ndo_tx_timeout		 = ipoib_timeout,
+	.ndo_set_rx_mode	 = ipoib_set_mcast_list,
+	.ndo_get_iflink		 = ipoib_get_iflink,
+	.ndo_set_vf_link_state	 = ipoib_set_vf_link_state,
+	.ndo_get_vf_config	 = ipoib_get_vf_config,
+	.ndo_get_vf_stats	 = ipoib_get_vf_stats,
+	.ndo_set_vf_guid	 = ipoib_set_vf_guid,
+	.ndo_set_mac_address	 = ipoib_set_mac,
+	.ndo_get_stats64	 = ipoib_get_stats,
+	.ndo_do_ioctl		 = ipoib_ioctl,
+};
+
+static const struct net_device_ops ipoib_netdev_ops_vf = {
+	.ndo_init		 = ipoib_ndo_init,
+	.ndo_uninit		 = ipoib_ndo_uninit,
+	.ndo_open		 = ipoib_open,
+	.ndo_stop		 = ipoib_stop,
+	.ndo_change_mtu		 = ipoib_change_mtu,
+	.ndo_fix_features	 = ipoib_fix_features,
+	.ndo_start_xmit	 	 = ipoib_start_xmit,
+	.ndo_tx_timeout		 = ipoib_timeout,
+	.ndo_set_rx_mode	 = ipoib_set_mcast_list,
+	.ndo_get_iflink		 = ipoib_get_iflink,
+	.ndo_get_stats64	 = ipoib_get_stats,
+	.ndo_do_ioctl		 = ipoib_ioctl,
+};
+
+void ipoib_setup_common(struct net_device *dev)
+{
+	dev->header_ops		 = &ipoib_header_ops;
+
+	ipoib_set_ethtool_ops(dev);
+
+	dev->watchdog_timeo	 = HZ;
+
+	dev->flags		|= IFF_BROADCAST | IFF_MULTICAST;
+
+	dev->hard_header_len	 = IPOIB_HARD_LEN;
+	dev->addr_len		 = INFINIBAND_ALEN;
+	dev->type		 = ARPHRD_INFINIBAND;
+	dev->tx_queue_len	 = ipoib_sendq_size * 2;
+	dev->features		 = (NETIF_F_VLAN_CHALLENGED	|
+				    NETIF_F_HIGHDMA);
+	netif_keep_dst(dev);
+
+	memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
+
+	/*
+	 * unregister_netdev always frees the netdev, we use this mode
+	 * consistently to unify all the various unregister paths, including
+	 * those connected to rtnl_link_ops which require it.
+	 */
+	dev->needs_free_netdev = true;
+}
+
+static void ipoib_build_priv(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	priv->dev = dev;
+	spin_lock_init(&priv->lock);
+	init_rwsem(&priv->vlan_rwsem);
+	mutex_init(&priv->mcast_mutex);
+
+	INIT_LIST_HEAD(&priv->path_list);
+	INIT_LIST_HEAD(&priv->child_intfs);
+	INIT_LIST_HEAD(&priv->dead_ahs);
+	INIT_LIST_HEAD(&priv->multicast_list);
+
+	INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
+	INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
+	INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
+	INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
+	INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
+	INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
+	INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
+	INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
+}
+
+static const struct net_device_ops ipoib_netdev_default_pf = {
+	.ndo_init		 = ipoib_dev_init_default,
+	.ndo_uninit		 = ipoib_dev_uninit_default,
+	.ndo_open		 = ipoib_ib_dev_open_default,
+	.ndo_stop		 = ipoib_ib_dev_stop_default,
+};
+
+static struct net_device
+*ipoib_create_netdev_default(struct ib_device *hca,
+			     const char *name,
+			     unsigned char name_assign_type,
+			     void (*setup)(struct net_device *))
+{
+	struct net_device *dev;
+	struct rdma_netdev *rn;
+
+	dev = alloc_netdev((int)sizeof(struct rdma_netdev),
+			   name,
+			   name_assign_type, setup);
+	if (!dev)
+		return NULL;
+
+	rn = netdev_priv(dev);
+
+	rn->send = ipoib_send;
+	rn->attach_mcast = ipoib_mcast_attach;
+	rn->detach_mcast = ipoib_mcast_detach;
+	rn->hca = hca;
+	dev->netdev_ops = &ipoib_netdev_default_pf;
+
+	return dev;
+}
+
+static struct net_device *ipoib_get_netdev(struct ib_device *hca, u8 port,
+					   const char *name)
+{
+	struct net_device *dev;
+
+	if (hca->alloc_rdma_netdev) {
+		dev = hca->alloc_rdma_netdev(hca, port,
+					     RDMA_NETDEV_IPOIB, name,
+					     NET_NAME_UNKNOWN,
+					     ipoib_setup_common);
+		if (IS_ERR_OR_NULL(dev) && PTR_ERR(dev) != -EOPNOTSUPP)
+			return NULL;
+	}
+
+	if (!hca->alloc_rdma_netdev || PTR_ERR(dev) == -EOPNOTSUPP)
+		dev = ipoib_create_netdev_default(hca, name, NET_NAME_UNKNOWN,
+						  ipoib_setup_common);
+
+	return dev;
+}
+
+struct ipoib_dev_priv *ipoib_intf_alloc(struct ib_device *hca, u8 port,
+					const char *name)
+{
+	struct net_device *dev;
+	struct ipoib_dev_priv *priv;
+	struct rdma_netdev *rn;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return NULL;
+
+	priv->ca = hca;
+	priv->port = port;
+
+	dev = ipoib_get_netdev(hca, port, name);
+	if (!dev)
+		goto free_priv;
+
+	priv->rn_ops = dev->netdev_ops;
+
+	/* fixme : should be after the query_cap */
+	if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
+		dev->netdev_ops	= &ipoib_netdev_ops_vf;
+	else
+		dev->netdev_ops	= &ipoib_netdev_ops_pf;
+
+	rn = netdev_priv(dev);
+	rn->clnt_priv = priv;
+
+	/*
+	 * Only the child register_netdev flows can handle priv_destructor
+	 * being set, so we force it to NULL here and handle manually until it
+	 * is safe to turn on.
+	 */
+	priv->next_priv_destructor = dev->priv_destructor;
+	dev->priv_destructor = NULL;
+
+	ipoib_build_priv(dev);
+
+	return priv;
+free_priv:
+	kfree(priv);
+	return NULL;
+}
+
+void ipoib_intf_free(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct rdma_netdev *rn = netdev_priv(dev);
+
+	dev->priv_destructor = priv->next_priv_destructor;
+	if (dev->priv_destructor)
+		dev->priv_destructor(dev);
+
+	/*
+	 * There are some error flows around register_netdev failing that may
+	 * attempt to call priv_destructor twice, prevent that from happening.
+	 */
+	dev->priv_destructor = NULL;
+
+	/* unregister/destroy is very complicated. Make bugs more obvious. */
+	rn->clnt_priv = NULL;
+
+	kfree(priv);
+}
+
+static ssize_t show_pkey(struct device *dev,
+			 struct device_attribute *attr, char *buf)
+{
+	struct net_device *ndev = to_net_dev(dev);
+	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
+
+	return sprintf(buf, "0x%04x\n", priv->pkey);
+}
+static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
+
+static ssize_t show_umcast(struct device *dev,
+			   struct device_attribute *attr, char *buf)
+{
+	struct net_device *ndev = to_net_dev(dev);
+	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
+
+	return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
+}
+
+void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(ndev);
+
+	if (umcast_val > 0) {
+		set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
+		ipoib_warn(priv, "ignoring multicast groups joined directly "
+				"by userspace\n");
+	} else
+		clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
+}
+
+static ssize_t set_umcast(struct device *dev,
+			  struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
+
+	ipoib_set_umcast(to_net_dev(dev), umcast_val);
+
+	return count;
+}
+static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
+
+int ipoib_add_umcast_attr(struct net_device *dev)
+{
+	return device_create_file(&dev->dev, &dev_attr_umcast);
+}
+
+static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
+{
+	struct ipoib_dev_priv *child_priv;
+	struct net_device *netdev = priv->dev;
+
+	netif_addr_lock_bh(netdev);
+
+	memcpy(&priv->local_gid.global.interface_id,
+	       &gid->global.interface_id,
+	       sizeof(gid->global.interface_id));
+	memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
+	clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
+
+	netif_addr_unlock_bh(netdev);
+
+	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
+		down_read(&priv->vlan_rwsem);
+		list_for_each_entry(child_priv, &priv->child_intfs, list)
+			set_base_guid(child_priv, gid);
+		up_read(&priv->vlan_rwsem);
+	}
+}
+
+static int ipoib_check_lladdr(struct net_device *dev,
+			      struct sockaddr_storage *ss)
+{
+	union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
+	int ret = 0;
+
+	netif_addr_lock_bh(dev);
+
+	/* Make sure the QPN, reserved and subnet prefix match the current
+	 * lladdr, it also makes sure the lladdr is unicast.
+	 */
+	if (memcmp(dev->dev_addr, ss->__data,
+		   4 + sizeof(gid->global.subnet_prefix)) ||
+	    gid->global.interface_id == 0)
+		ret = -EINVAL;
+
+	netif_addr_unlock_bh(dev);
+
+	return ret;
+}
+
+static int ipoib_set_mac(struct net_device *dev, void *addr)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct sockaddr_storage *ss = addr;
+	int ret;
+
+	if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
+		return -EBUSY;
+
+	ret = ipoib_check_lladdr(dev, ss);
+	if (ret)
+		return ret;
+
+	set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
+
+	queue_work(ipoib_workqueue, &priv->flush_light);
+
+	return 0;
+}
+
+static ssize_t create_child(struct device *dev,
+			    struct device_attribute *attr,
+			    const char *buf, size_t count)
+{
+	int pkey;
+	int ret;
+
+	if (sscanf(buf, "%i", &pkey) != 1)
+		return -EINVAL;
+
+	if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
+		return -EINVAL;
+
+	ret = ipoib_vlan_add(to_net_dev(dev), pkey);
+
+	return ret ? ret : count;
+}
+static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
+
+static ssize_t delete_child(struct device *dev,
+			    struct device_attribute *attr,
+			    const char *buf, size_t count)
+{
+	int pkey;
+	int ret;
+
+	if (sscanf(buf, "%i", &pkey) != 1)
+		return -EINVAL;
+
+	if (pkey < 0 || pkey > 0xffff)
+		return -EINVAL;
+
+	ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
+
+	return ret ? ret : count;
+
+}
+static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
+
+int ipoib_add_pkey_attr(struct net_device *dev)
+{
+	return device_create_file(&dev->dev, &dev_attr_pkey);
+}
+
+static struct net_device *ipoib_add_port(const char *format,
+					 struct ib_device *hca, u8 port)
+{
+	struct ipoib_dev_priv *priv;
+	struct net_device *ndev;
+	int result;
+
+	priv = ipoib_intf_alloc(hca, port, format);
+	if (!priv) {
+		pr_warn("%s, %d: ipoib_intf_alloc failed\n", hca->name, port);
+		return ERR_PTR(-ENOMEM);
+	}
+	ndev = priv->dev;
+
+	INIT_IB_EVENT_HANDLER(&priv->event_handler,
+			      priv->ca, ipoib_event);
+	ib_register_event_handler(&priv->event_handler);
+
+	/* call event handler to ensure pkey in sync */
+	queue_work(ipoib_workqueue, &priv->flush_heavy);
+
+	result = register_netdev(ndev);
+	if (result) {
+		pr_warn("%s: couldn't register ipoib port %d; error %d\n",
+			hca->name, port, result);
+
+		ipoib_parent_unregister_pre(ndev);
+		ipoib_intf_free(ndev);
+		free_netdev(ndev);
+
+		return ERR_PTR(result);
+	}
+
+	/*
+	 * We cannot set priv_destructor before register_netdev because we
+	 * need priv to be always valid during the error flow to execute
+	 * ipoib_parent_unregister_pre(). Instead handle it manually and only
+	 * enter priv_destructor mode once we are completely registered.
+	 */
+	ndev->priv_destructor = ipoib_intf_free;
+
+	if (ipoib_cm_add_mode_attr(ndev))
+		goto sysfs_failed;
+	if (ipoib_add_pkey_attr(ndev))
+		goto sysfs_failed;
+	if (ipoib_add_umcast_attr(ndev))
+		goto sysfs_failed;
+	if (device_create_file(&ndev->dev, &dev_attr_create_child))
+		goto sysfs_failed;
+	if (device_create_file(&ndev->dev, &dev_attr_delete_child))
+		goto sysfs_failed;
+
+	return ndev;
+
+sysfs_failed:
+	ipoib_parent_unregister_pre(ndev);
+	unregister_netdev(ndev);
+	return ERR_PTR(-ENOMEM);
+}
+
+static void ipoib_add_one(struct ib_device *device)
+{
+	struct list_head *dev_list;
+	struct net_device *dev;
+	struct ipoib_dev_priv *priv;
+	int p;
+	int count = 0;
+
+	dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL);
+	if (!dev_list)
+		return;
+
+	INIT_LIST_HEAD(dev_list);
+
+	for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
+		if (!rdma_protocol_ib(device, p))
+			continue;
+		dev = ipoib_add_port("ib%d", device, p);
+		if (!IS_ERR(dev)) {
+			priv = ipoib_priv(dev);
+			list_add_tail(&priv->list, dev_list);
+			count++;
+		}
+	}
+
+	if (!count) {
+		kfree(dev_list);
+		return;
+	}
+
+	ib_set_client_data(device, &ipoib_client, dev_list);
+}
+
+static void ipoib_remove_one(struct ib_device *device, void *client_data)
+{
+	struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
+	struct list_head *dev_list = client_data;
+
+	if (!dev_list)
+		return;
+
+	list_for_each_entry_safe(priv, tmp, dev_list, list) {
+		LIST_HEAD(head);
+		ipoib_parent_unregister_pre(priv->dev);
+
+		rtnl_lock();
+
+		list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs,
+					 list)
+			unregister_netdevice_queue(cpriv->dev, &head);
+		unregister_netdevice_queue(priv->dev, &head);
+		unregister_netdevice_many(&head);
+
+		rtnl_unlock();
+	}
+
+	kfree(dev_list);
+}
+
+#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
+static struct notifier_block ipoib_netdev_notifier = {
+	.notifier_call = ipoib_netdev_event,
+};
+#endif
+
+static int __init ipoib_init_module(void)
+{
+	int ret;
+
+	ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
+	ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
+	ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
+
+	ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
+	ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
+	ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
+#ifdef CONFIG_INFINIBAND_IPOIB_CM
+	ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
+	ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
+#endif
+
+	/*
+	 * When copying small received packets, we only copy from the
+	 * linear data part of the SKB, so we rely on this condition.
+	 */
+	BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
+
+	ret = ipoib_register_debugfs();
+	if (ret)
+		return ret;
+
+	/*
+	 * We create a global workqueue here that is used for all flush
+	 * operations.  However, if you attempt to flush a workqueue
+	 * from a task on that same workqueue, it deadlocks the system.
+	 * We want to be able to flush the tasks associated with a
+	 * specific net device, so we also create a workqueue for each
+	 * netdevice.  We queue up the tasks for that device only on
+	 * its private workqueue, and we only queue up flush events
+	 * on our global flush workqueue.  This avoids the deadlocks.
+	 */
+	ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0);
+	if (!ipoib_workqueue) {
+		ret = -ENOMEM;
+		goto err_fs;
+	}
+
+	ib_sa_register_client(&ipoib_sa_client);
+
+	ret = ib_register_client(&ipoib_client);
+	if (ret)
+		goto err_sa;
+
+	ret = ipoib_netlink_init();
+	if (ret)
+		goto err_client;
+
+#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
+	register_netdevice_notifier(&ipoib_netdev_notifier);
+#endif
+	return 0;
+
+err_client:
+	ib_unregister_client(&ipoib_client);
+
+err_sa:
+	ib_sa_unregister_client(&ipoib_sa_client);
+	destroy_workqueue(ipoib_workqueue);
+
+err_fs:
+	ipoib_unregister_debugfs();
+
+	return ret;
+}
+
+static void __exit ipoib_cleanup_module(void)
+{
+#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
+	unregister_netdevice_notifier(&ipoib_netdev_notifier);
+#endif
+	ipoib_netlink_fini();
+	ib_unregister_client(&ipoib_client);
+	ib_sa_unregister_client(&ipoib_sa_client);
+	ipoib_unregister_debugfs();
+	destroy_workqueue(ipoib_workqueue);
+}
+
+module_init(ipoib_init_module);
+module_exit(ipoib_cleanup_module);