diff options
| author | Eric Dumazet <edumazet@google.com> | 2024-03-07 23:00:16 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2024-03-11 10:56:03 +0100 |
| commit | 08842c43d0165b0ed78907fd8cc92ce17d857913 (patch) | |
| tree | 160989a2a4c9aac50ed9694d32d0dea8912ca5a0 /net | |
| parent | Merge branch 'getsockopt-parameter-validation' (diff) | |
| download | linux-08842c43d0165b0ed78907fd8cc92ce17d857913.tar.xz linux-08842c43d0165b0ed78907fd8cc92ce17d857913.zip | |
udp: no longer touch sk->sk_refcnt in early demux
After commits ca065d0cf80f ("udp: no longer use SLAB_DESTROY_BY_RCU")
and 7ae215d23c12 ("bpf: Don't refcount LISTEN sockets in sk_assign()")
UDP early demux no longer need to grab a refcount on the UDP socket.
This save two atomic operations per incoming packet for connected
sockets.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Joe Stringer <joe@wand.net.nz>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: Kuniyuki Iwashima <kuniyu@amazon.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/udp.c | 5 | ||||
| -rw-r--r-- | net/ipv6/udp.c | 5 |
2 files changed, 6 insertions, 4 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 43ec4812b60e..661d0e0d273f 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -2568,11 +2568,12 @@ int udp_v4_early_demux(struct sk_buff *skb) uh->source, iph->saddr, dif, sdif); } - if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) + if (!sk) return 0; skb->sk = sk; - skb->destructor = sock_efree; + DEBUG_NET_WARN_ON_ONCE(sk_is_refcounted(sk)); + skb->destructor = sock_pfree; dst = rcu_dereference(sk->sk_rx_dst); if (dst) diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 80ad8f436b17..7c1e6469d091 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -1098,11 +1098,12 @@ void udp_v6_early_demux(struct sk_buff *skb) else return; - if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) + if (!sk) return; skb->sk = sk; - skb->destructor = sock_efree; + DEBUG_NET_WARN_ON_ONCE(sk_is_refcounted(sk)); + skb->destructor = sock_pfree; dst = rcu_dereference(sk->sk_rx_dst); if (dst) |