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authorEric Dumazet <edumazet@google.com>2018-04-18 11:43:15 -0700
committerDavid S. Miller <davem@davemloft.net>2018-04-19 13:44:11 -0400
commit88078d98d1bb085d72af8437707279e203524fa5 (patch)
treebf20f9ebb371aa14ce699ad9be0afc093babd04b /net/ipv6/anycast.c
parentnet-next/hinic: add arm64 support (diff)
downloadlinux-dev-88078d98d1bb085d72af8437707279e203524fa5.tar.xz
linux-dev-88078d98d1bb085d72af8437707279e203524fa5.zip
net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends
After working on IP defragmentation lately, I found that some large packets defeat CHECKSUM_COMPLETE optimization because of NIC adding zero paddings on the last (small) fragment. While removing the padding with pskb_trim_rcsum(), we set skb->ip_summed to CHECKSUM_NONE, forcing a full csum validation, even if all prior fragments had CHECKSUM_COMPLETE set. We can instead compute the checksum of the part we are trimming, usually smaller than the part we keep. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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