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(parent: 7033190) | patch
gro: optimize skb_gro_postpull_rcsum()
authorEric Dumazet <edumazet@google.com>
Wed, 24 Nov 2021 20:24:45 +0000 (12:24 -0800)
committerJakub Kicinski <kuba@kernel.org>
Fri, 26 Nov 2021 05:03:31 +0000 (21:03 -0800)
commit0bd28476f6363c7ccc841fe6a0ab0dd1fdb822f6
tree8d1bfa9f18c5d8082794f804dea59d21312a88c4tree
parent703319094c9c2bf34f65d3496ccb350149fdd14bcommit | diff
gro: optimize skb_gro_postpull_rcsum()

We can leverage third argument to csum_partial():

  X = csum_sub(X, csum_partial(start, len, 0));

  -->

  X = csum_add(X, ~csum_partial(start, len, 0));

  -->

  X = ~csum_partial(start, len, ~X);

This removes one add/adc pair and its dependency against the carry flag.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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