Merge branch 'net-small-csum-optimizations'

Eric Dumazet says:

====================
net: small csum optimizations

After recent x86 csum_partial() optimizations, we can more easily
see in kernel profiles costs of add/adc operations that could
be avoided, by feeding a non zero third argument to csum_partial()
====================

Link: https://lore.kernel.org/r/20211124202446.2917972-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>