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.
backport of upstream commit 430eda6d6d56 (vxlan: Optimize
vxlan rcv).
Signed-off-by: Pravin B Shelar <pshe...@nicira.com>
---
v2:
Use ACCESS_ONCE() to read vs.
---
datapath/linux/compat/vxlan.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/datapath/linux/compat/vxlan.c b/datapath/linux/compat/vxlan.c
index db14f2f..0b6fd36 100644
--- a/datapath/linux/compat/vxlan.c
+++ b/datapath/linux/compat/vxlan.c
@@ -124,7 +124,8 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct
sk_buff *skb)
if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
goto drop;
- vs = vxlan_find_sock(sock_net(sk), inet_sport(sk));
+ vs = (struct vxlan_sock *)ACCESS_ONCE(sk->sk_user_data);
+ smp_read_barrier_depends();
if (!vs)
goto drop;
@@ -322,6 +323,8 @@ static struct vxlan_sock *vxlan_socket_create(struct net
*net, __be16 port,
}
vs->rcv = rcv;
vs->data = data;
+ smp_wmb();
+ vs->sock->sk->sk_user_data = vs;
/* Disable multicast loopback */
inet_sk(sk)->mc_loop = 0;
@@ -359,6 +362,8 @@ 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(&vs->del_work);
--
1.7.1
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