ipv6: avoid partial copy for zc

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Even when zerocopy transmission is requested and possible,
__ip_append_data() will still copy a small chunk of data just because it
allocated some extra linear space (e.g. 128 bytes). It wastes CPU cycles
on copy and iter manipulations and also misalignes potentially aligned
data. Avoid such copies. And as a bonus we can allocate smaller skb.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Pavel Begunkov 2022-07-12 21:52:26 +01:00 • committed by Jakub Kicinski

parent 8eb77cc739

commit 773ba4fe91

1 changed files with 6 additions and 1 deletions

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net/ipv6/ip6_output.c

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