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udp: use sk_protocol instead of pcflag to detect udplite sockets
In the udp_sock struct, the 'forward_deficit' and 'pcflag' fields share the same cacheline. While the first is dirtied by udp_recvmsg, the latter is read, possibly several times, by the bottom half processing to discriminate between udp and udplite sockets. With this patch, sk->sk_protocol is used to check is the socket is really an udplite one, avoiding some cache misses per packet and improving the performance under udp_flood with small packet up to 10%. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -115,6 +115,6 @@ static inline bool udp_get_no_check6_rx(struct sock *sk)
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#define udp_portaddr_for_each_entry_rcu(__sk, list) \
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hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node)
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#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
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#define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE)
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#endif /* _LINUX_UDP_H */
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