[PATCH net] powerpc: use big endian to hash len and proto in csum_ipv6_magic

[David Miller]

From: Xin Long <lucien.xin at gmail.com>
Date: Sat,  8 Sep 2018 18:15:12 +0800

> The function csum_ipv6_magic doesn't convert len and proto to big
> endian before doing ipv6 csum hash, which is not consistent with
> RFC and other arches.
> 
> Jianlin found it when ICMPv6 packets from other hosts were dropped
> in the powerpc64 system.
> 
> This patch is to fix it by using instruction 'lwbrx' to do this
> conversion in powerpc32/64 csum_ipv6_magic.
> 
> Fixes: e9c4943a107b ("powerpc: Implement csum_ipv6_magic in assembly")
> Reported-by: Jianlin Shi <jishi at redhat.com>
> Signed-off-by: Xin Long <lucien.xin at gmail.com>

Xin, please address the feedback you were given.

Thank you.