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vxlan: Free vxlan_sock with kfree_rcu().

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We will remove synchronize_rcu() in udp_tunnel_sock_release().

We must ensure that vxlan_sock is freed after inflight RX fast path.

Let's free vxlan_sock with kfree_rcu().

Note that vxlan_sock.vni_list[] is 8K and struct rcu_head must
be placed before it.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260502031401.3557229-9-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima 2026-05-02 03:13:01 +00:00 committed by Jakub Kicinski
parent 027bffa1ad
commit 4f71dd1b42
2 changed files with 3 additions and 2 deletions
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4
drivers/net/vxlan/vxlan_core.c
View File

@ -1524,13 +1524,13 @@ static void vxlan_sock_release(struct vxlan_dev *vxlan)
if (__vxlan_sock_release_prep(sock4)) {
udp_tunnel_sock_release(sock4->sk);
kfree(sock4);
kfree_rcu(sock4, rcu);
}
#if IS_ENABLED(CONFIG_IPV6)
if (__vxlan_sock_release_prep(sock6)) {
udp_tunnel_sock_release(sock6->sk);
kfree(sock6);
kfree_rcu(sock6, rcu);
}
#endif
}

1
include/net/vxlan.h
View File

@ -186,6 +186,7 @@ struct vxlan_metadata {
struct vxlan_sock {
struct hlist_node hlist;
struct sock *sk;
struct rcu_head rcu;
struct hlist_head vni_list[VNI_HASH_SIZE];
refcount_t refcnt;
u32 flags;