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alistair23-linux
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vxlan: Optimize vxlan rcv 

vxlan-udp-recv function lookup vxlan_sock struct on every packet
recv by using udp-port number. we can use sk->sk_user_data to
store vxlan_sock and avoid lookup.
I have open coded rcu-api to store and read vxlan_sock from
sk_user_data to avoid sparse warning as sk_user_data is not
__rcu pointer.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Pravin B Shelar 2013-09-03 09:44:44 -07:00 committed by David S. Miller
parent f8de31040d
commit 430eda6d6d
1 changed files with 6 additions and 1 deletions
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7
drivers/net/vxlan.c
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@ -916,6 +916,8 @@ void vxlan_sock_release(struct vxlan_sock *vs)
spin_lock(&vn->sock_lock);
hlist_del_rcu(&vs->hlist);
smp_wmb();
vs->sock->sk->sk_user_data = NULL;
spin_unlock(&vn->sock_lock);
queue_work(vxlan_wq, &vs->del_work);
@ -1009,7 +1011,8 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
port = inet_sk(sk)->inet_sport;
vs = vxlan_find_sock(sock_net(sk), port);
smp_read_barrier_depends();
vs = (struct vxlan_sock *)sk->sk_user_data;
if (!vs)
goto drop;
@ -2236,6 +2239,8 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
atomic_set(&vs->refcnt, 1);
vs->rcv = rcv;
vs->data = data;
smp_wmb();
vs->sock->sk->sk_user_data = vs;
spin_lock(&vn->sock_lock);
hlist_add_head_rcu(&vs->hlist, vs_head(net, port));