netdev - [PATCH 0/9 v2] net: Checksum offload changes

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Message-ID: <alpine.DEB.2.02.1404261404550.27669@tomh.mtv.corp.google.com>
Date:	Sat, 26 Apr 2014 14:24:23 -0700 (PDT)
From:	Tom Herbert <therbert@...gle.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 0/9 v2] net: Checksum offload changes

I am working on overhauling RX checksum offload. Goals of this effort
are:

- Specify what exactly it means when driver returns CHECKSUM_UNNECESSARY
- Preserve CHECKSUM_COMPLETE through encapsulation layers
- Don't do skb_checksum more than once per packet
- Unify GRO and non-GRO csum verification as much as possible
- Unify the checksum functions (checksum_init)
- Simply code

What is in this first patch set:

- Create a common "checksum_init" function which is called from
  TCPv{4,6} and UDPv{4,6}
- Add some support for RFC6936, UDP/IPv6 zero checksums
- Allow bad device checksum complete to be trusted.
- Add architecture support for csum_add and provided implementations
  for x86_64 and Sparc 32 and 64 bit (please test the latter)

Please review carefully and test if possible, mucking with basic
checksum functions is always a little precarious :-)
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