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Commit fe1e0713 authored by Litao jiao's avatar Litao jiao Committed by David S. Miller
Browse files

vxlan: Use FDB_HASH_SIZE hash_locks to reduce contention 



The monolithic hash_lock could cause huge contention when
inserting/deletiing vxlan_fdbs into the fdb_head.

Use FDB_HASH_SIZE hash_locks to protect insertions/deletions
of vxlan_fdbs into the fdb_head hash table.

Suggested-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarLitao jiao <jiaolitao@raisecom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4daa95af

drivers/net/vxlan.c

+59 −33
Original line number Diff line number Diff line
@@ -471,14 +471,19 @@ static u32 eth_vni_hash(const unsigned char *addr, __be32 vni) 
	return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);

}



static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)

{

	if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)

		return eth_vni_hash(mac, vni);

	else

		return eth_hash(mac);

}



/* Hash chain to use given mac address */

static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,

						const u8 *mac, __be32 vni)

{

	if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)

		return &vxlan->fdb_head[eth_vni_hash(mac, vni)];

	else

		return &vxlan->fdb_head[eth_hash(mac)];

	return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];

}



/* Look up Ethernet address in forwarding table */
@@ -593,8 +598,8 @@ int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 
		return -EINVAL;

	vxlan = netdev_priv(dev);



	spin_lock_bh(&vxlan->hash_lock);

	for (h = 0; h < FDB_HASH_SIZE; ++h) {

		spin_lock_bh(&vxlan->hash_lock[h]);

		hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {

			if (f->vni == vni) {

				list_for_each_entry(rdst, &f->remotes, list) {
@@ -602,14 +607,16 @@ int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 
								  f, rdst,

								  extack);

					if (rc)

						goto out;

						goto unlock;

				}

			}

		}

		spin_unlock_bh(&vxlan->hash_lock[h]);

	}

	return 0;



out:

	spin_unlock_bh(&vxlan->hash_lock);

unlock:

	spin_unlock_bh(&vxlan->hash_lock[h]);

	return rc;

}

EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
@@ -625,14 +632,15 @@ void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) 
		return;

	vxlan = netdev_priv(dev);



	spin_lock_bh(&vxlan->hash_lock);

	for (h = 0; h < FDB_HASH_SIZE; ++h) {

		spin_lock_bh(&vxlan->hash_lock[h]);

		hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)

			if (f->vni == vni)

				list_for_each_entry(rdst, &f->remotes, list)

					rdst->offloaded = false;

		spin_unlock_bh(&vxlan->hash_lock[h]);

	}

	spin_unlock_bh(&vxlan->hash_lock);



}

EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
@@ -1108,6 +1116,7 @@ static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 
	__be16 port;

	__be32 src_vni, vni;

	u32 ifindex;

	u32 hash_index;

	int err;



	if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
@@ -1126,12 +1135,13 @@ static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 
	if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)

		return -EAFNOSUPPORT;



	spin_lock_bh(&vxlan->hash_lock);

	hash_index = fdb_head_index(vxlan, addr, src_vni);

	spin_lock_bh(&vxlan->hash_lock[hash_index]);

	err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,

			       port, src_vni, vni, ifindex,

			       ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,

			       true, extack);

	spin_unlock_bh(&vxlan->hash_lock);

	spin_unlock_bh(&vxlan->hash_lock[hash_index]);



	return err;

}
@@ -1179,16 +1189,18 @@ static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 
	__be32 src_vni, vni;

	__be16 port;

	u32 ifindex;

	u32 hash_index;

	int err;



	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);

	if (err)

		return err;



	spin_lock_bh(&vxlan->hash_lock);

	hash_index = fdb_head_index(vxlan, addr, src_vni);

	spin_lock_bh(&vxlan->hash_lock[hash_index]);

	err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,

				 true);

	spin_unlock_bh(&vxlan->hash_lock);

	spin_unlock_bh(&vxlan->hash_lock[hash_index]);



	return err;

}
@@ -1300,8 +1312,10 @@ static bool vxlan_snoop(struct net_device *dev, 
		f->updated = jiffies;

		vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);

	} else {

		u32 hash_index = fdb_head_index(vxlan, src_mac, vni);



		/* learned new entry */

		spin_lock(&vxlan->hash_lock);

		spin_lock(&vxlan->hash_lock[hash_index]);



		/* close off race between vxlan_flush and incoming packets */

		if (netif_running(dev))
@@ -1312,7 +1326,7 @@ static bool vxlan_snoop(struct net_device *dev, 
					 vni,

					 vxlan->default_dst.remote_vni,

					 ifindex, NTF_SELF, true, NULL);

		spin_unlock(&vxlan->hash_lock);

		spin_unlock(&vxlan->hash_lock[hash_index]);

	}



	return false;
@@ -2702,7 +2716,7 @@ static void vxlan_cleanup(struct timer_list *t) 
	for (h = 0; h < FDB_HASH_SIZE; ++h) {

		struct hlist_node *p, *n;



		spin_lock(&vxlan->hash_lock);

		spin_lock(&vxlan->hash_lock[h]);

		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {

			struct vxlan_fdb *f

				= container_of(p, struct vxlan_fdb, hlist);
@@ -2724,7 +2738,7 @@ static void vxlan_cleanup(struct timer_list *t) 
			} else if (time_before(timeout, next_timer))

				next_timer = timeout;

		}

		spin_unlock(&vxlan->hash_lock);

		spin_unlock(&vxlan->hash_lock[h]);

	}



	mod_timer(&vxlan->age_timer, next_timer);
@@ -2767,12 +2781,13 @@ static int vxlan_init(struct net_device *dev) 
static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)

{

	struct vxlan_fdb *f;

	u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);



	spin_lock_bh(&vxlan->hash_lock);

	spin_lock_bh(&vxlan->hash_lock[hash_index]);

	f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);

	if (f)

		vxlan_fdb_destroy(vxlan, f, true, true);

	spin_unlock_bh(&vxlan->hash_lock);

	spin_unlock_bh(&vxlan->hash_lock[hash_index]);

}



static void vxlan_uninit(struct net_device *dev)
@@ -2817,9 +2832,10 @@ static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all) 
{

	unsigned int h;



	spin_lock_bh(&vxlan->hash_lock);

	for (h = 0; h < FDB_HASH_SIZE; ++h) {

		struct hlist_node *p, *n;



		spin_lock_bh(&vxlan->hash_lock[h]);

		hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {

			struct vxlan_fdb *f

				= container_of(p, struct vxlan_fdb, hlist);
@@ -2829,8 +2845,8 @@ static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all) 
			if (!is_zero_ether_addr(f->eth_addr))

				vxlan_fdb_destroy(vxlan, f, true, true);

		}

		spin_unlock_bh(&vxlan->hash_lock[h]);

	}

	spin_unlock_bh(&vxlan->hash_lock);

}



/* Cleanup timer and forwarding table on shutdown */
@@ -3014,7 +3030,6 @@ static void vxlan_setup(struct net_device *dev) 
	dev->max_mtu = ETH_MAX_MTU;



	INIT_LIST_HEAD(&vxlan->next);

	spin_lock_init(&vxlan->hash_lock);



	timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
@@ -3022,9 +3037,11 @@ static void vxlan_setup(struct net_device *dev) 


	gro_cells_init(&vxlan->gro_cells, dev);



	for (h = 0; h < FDB_HASH_SIZE; ++h)

	for (h = 0; h < FDB_HASH_SIZE; ++h) {

		spin_lock_init(&vxlan->hash_lock[h]);

		INIT_HLIST_HEAD(&vxlan->fdb_head[h]);

	}

}



static void vxlan_ether_setup(struct net_device *dev)

{
@@ -3917,7 +3934,9 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 


	/* handle default dst entry */

	if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {

		spin_lock_bh(&vxlan->hash_lock);

		u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);



		spin_lock_bh(&vxlan->hash_lock[hash_index]);

		if (!vxlan_addr_any(&conf.remote_ip)) {

			err = vxlan_fdb_update(vxlan, all_zeros_mac,

					       &conf.remote_ip,
@@ -3928,7 +3947,7 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 
					       conf.remote_ifindex,

					       NTF_SELF, true, extack);

			if (err) {

				spin_unlock_bh(&vxlan->hash_lock);

				spin_unlock_bh(&vxlan->hash_lock[hash_index]);

				return err;

			}

		}
@@ -3940,7 +3959,7 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 
					   dst->remote_vni,

					   dst->remote_ifindex,

					   true);

		spin_unlock_bh(&vxlan->hash_lock);

		spin_unlock_bh(&vxlan->hash_lock[hash_index]);

	}



	if (conf.age_interval != vxlan->cfg.age_interval)
@@ -4195,8 +4214,11 @@ vxlan_fdb_offloaded_set(struct net_device *dev, 
	struct vxlan_dev *vxlan = netdev_priv(dev);

	struct vxlan_rdst *rdst;

	struct vxlan_fdb *f;

	u32 hash_index;



	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);



	spin_lock_bh(&vxlan->hash_lock);

	spin_lock_bh(&vxlan->hash_lock[hash_index]);



	f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);

	if (!f)
@@ -4212,7 +4234,7 @@ vxlan_fdb_offloaded_set(struct net_device *dev, 
	rdst->offloaded = fdb_info->offloaded;



out:

	spin_unlock_bh(&vxlan->hash_lock);

	spin_unlock_bh(&vxlan->hash_lock[hash_index]);

}



static int
@@ -4221,11 +4243,13 @@ vxlan_fdb_external_learn_add(struct net_device *dev, 
{

	struct vxlan_dev *vxlan = netdev_priv(dev);

	struct netlink_ext_ack *extack;

	u32 hash_index;

	int err;



	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);

	extack = switchdev_notifier_info_to_extack(&fdb_info->info);



	spin_lock_bh(&vxlan->hash_lock);

	spin_lock_bh(&vxlan->hash_lock[hash_index]);

	err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,

			       NUD_REACHABLE,

			       NLM_F_CREATE | NLM_F_REPLACE,
@@ -4235,7 +4259,7 @@ vxlan_fdb_external_learn_add(struct net_device *dev, 
			       fdb_info->remote_ifindex,

			       NTF_USE | NTF_SELF | NTF_EXT_LEARNED,

			       false, extack);

	spin_unlock_bh(&vxlan->hash_lock);

	spin_unlock_bh(&vxlan->hash_lock[hash_index]);



	return err;

}
@@ -4246,9 +4270,11 @@ vxlan_fdb_external_learn_del(struct net_device *dev, 
{

	struct vxlan_dev *vxlan = netdev_priv(dev);

	struct vxlan_fdb *f;

	u32 hash_index;

	int err = 0;



	spin_lock_bh(&vxlan->hash_lock);

	hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);

	spin_lock_bh(&vxlan->hash_lock[hash_index]);



	f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);

	if (!f)
@@ -4262,7 +4288,7 @@ vxlan_fdb_external_learn_del(struct net_device *dev, 
					 fdb_info->remote_ifindex,

					 false);



	spin_unlock_bh(&vxlan->hash_lock);

	spin_unlock_bh(&vxlan->hash_lock[hash_index]);



	return err;

}

include/net/vxlan.h

+1 −1
Original line number Diff line number Diff line
@@ -242,7 +242,7 @@ struct vxlan_dev { 
	struct vxlan_rdst default_dst;	/* default destination */



	struct timer_list age_timer;

	spinlock_t	  hash_lock;

	spinlock_t	  hash_lock[FDB_HASH_SIZE];

	unsigned int	  addrcnt;

	struct gro_cells  gro_cells;