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>
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@ -916,6 +916,8 @@ void vxlan_sock_release(struct vxlan_sock *vs)
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spin_lock(&vn->sock_lock);
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hlist_del_rcu(&vs->hlist);
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smp_wmb();
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vs->sock->sk->sk_user_data = NULL;
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spin_unlock(&vn->sock_lock);
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queue_work(vxlan_wq, &vs->del_work);
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@ -1009,7 +1011,8 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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port = inet_sk(sk)->inet_sport;
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vs = vxlan_find_sock(sock_net(sk), port);
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smp_read_barrier_depends();
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vs = (struct vxlan_sock *)sk->sk_user_data;
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if (!vs)
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goto drop;
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@ -2236,6 +2239,8 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
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atomic_set(&vs->refcnt, 1);
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vs->rcv = rcv;
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vs->data = data;
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smp_wmb();
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vs->sock->sk->sk_user_data = vs;
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spin_lock(&vn->sock_lock);
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hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
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