netdev - [PATCH 0/4] net: Checksum offload changes

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Message-ID: <alpine.DEB.2.02.1406092323100.8817@tomh.mtv.corp.google.com>
Date:	Mon, 9 Jun 2014 23:34:18 -0700 (PDT)
From:	Tom Herbert <therbert@...gle.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 0/4] net: Checksum offload changes - Part IV

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 fourth patch set:

- Preserve CHECKSUM_COMPLETE instead of changing it to
  CHECKSUM_UNNECESSARY. This allows correct reuse in validating multiple
  csums in a packet.
- When SW needs to compute the packet checksum, save it as
  CHECKSUM_COMPLETE. Also mark that checksum was computed by SW.
- Add skb_gro_postpull_rcsum to udp and vxlan to make GRO work with
  CHECKSUM_COMPLETE.
- In TCP GRO set CHECKSUM_UNNECESSARY and skb->encapsulation
  if appropriate after validating checksum.

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