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(parent: 8eb77cc) | patch
ipv6: avoid partial copy for zc
authorPavel Begunkov <asml.silence@gmail.com>
Tue, 12 Jul 2022 20:52:26 +0000 (21:52 +0100)
committerJakub Kicinski <kuba@kernel.org>
Tue, 19 Jul 2022 02:58:29 +0000 (19:58 -0700)
commit773ba4fe9104a64a54d1c00f0fb6ffb95def2b03
tree5eda2b3a67d5dee6e800103090fcebdd3975bd67tree | snapshot
parent8eb77cc73977d88787b37c92831b1c242e035396commit | diff
ipv6: avoid partial copy for zc

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>
net/ipv6/ip6_output.c diff | blob | blame | history
Linux 6.x block layer and io_uring tree(s)