udp: avoid one cache line miss in recvmsg()
UDP_SKB_CB(skb)->partial_cov is located at offset 66 in skb, requesting a cold cache line being read in cpu cache. We can avoid this cache line miss for UDP sockets, as partial_cov has a meaning only for UDPLite. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1389,7 +1389,8 @@ try_again:
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* coverage checksum (UDP-Lite), do it before the copy.
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*/
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if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) {
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if (copied < ulen || peeking ||
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(is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
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checksum_valid = !udp_lib_checksum_complete(skb);
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if (!checksum_valid)
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goto csum_copy_err;
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@ -363,7 +363,8 @@ try_again:
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* coverage checksum (UDP-Lite), do it before the copy.
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*/
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if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) {
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if (copied < ulen || peeking ||
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(is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
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checksum_valid = !udp_lib_checksum_complete(skb);
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if (!checksum_valid)
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goto csum_copy_err;
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