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| author | Eric Dumazet <edumazet@google.com> | 2018-09-13 07:58:56 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-19 22:43:47 +0200 |
| commit | 6bf32cda46ebfbaf13da3c48a0a009adae925703 (patch) | |
| tree | 2196c2e84c41d663d19b7f2a29a41c4683ed45b0 /net/ipv4 | |
| parent | 5123ffdad65954b3c308e055b388db08987a13ff (diff) | |
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>
(cherry picked from commit 88078d98d1bb085d72af8437707279e203524fa5)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4')
0 files changed, 0 insertions, 0 deletions