udp: gro behind static key
Avoid the socket lookup cost in udp_gro_receive if no socket has a udp tunnel callback configured. udp_sk(sk)->gro_receive requires a registration with setup_udp_tunnel_sock, which enables the static key. Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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2b9156129f
Коммит
f2e9de210d
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@ -443,8 +443,10 @@ int udpv4_offload_init(void);
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void udp_init(void);
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DECLARE_STATIC_KEY_FALSE(udp_encap_needed_key);
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void udp_encap_enable(void);
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#if IS_ENABLED(CONFIG_IPV6)
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DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
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void udpv6_encap_enable(void);
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#endif
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@ -1889,7 +1889,7 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
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return 0;
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}
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static DEFINE_STATIC_KEY_FALSE(udp_encap_needed_key);
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DEFINE_STATIC_KEY_FALSE(udp_encap_needed_key);
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void udp_encap_enable(void)
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{
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static_branch_enable(&udp_encap_needed_key);
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@ -405,7 +405,7 @@ static struct sk_buff *udp4_gro_receive(struct list_head *head,
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{
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struct udphdr *uh = udp_gro_udphdr(skb);
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if (unlikely(!uh))
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if (unlikely(!uh) || !static_branch_unlikely(&udp_encap_needed_key))
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goto flush;
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/* Don't bother verifying checksum if we're going to flush anyway. */
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@ -548,7 +548,7 @@ static __inline__ void udpv6_err(struct sk_buff *skb,
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__udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
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}
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static DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
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DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
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void udpv6_encap_enable(void)
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{
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static_branch_enable(&udpv6_encap_needed_key);
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@ -119,7 +119,7 @@ static struct sk_buff *udp6_gro_receive(struct list_head *head,
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{
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struct udphdr *uh = udp_gro_udphdr(skb);
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if (unlikely(!uh))
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if (unlikely(!uh) || !static_branch_unlikely(&udpv6_encap_needed_key))
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goto flush;
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/* Don't bother verifying checksum if we're going to flush anyway. */
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