netdev - Does CHECKSUM_COMPLETE work at all?

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Message-ID: <CA+mtBx8safaPpcntjqT+eUQBDEOxJBoVf-a9djX_qgYsSdACeA@mail.gmail.com>
Date:	Fri, 21 Feb 2014 18:11:30 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Does CHECKSUM_COMPLETE work at all?

If a driver sets CHECKSUM_COMPLETE in a packet, I don't see anywhere
in either the Ethernet rcv path or ip_rcv where the skb->csum is being
pulled (no *pull_rcsum calls). I believe CHECKSUM_COMPLETE means the
checksum is over the whole packet (L2, L3, and L4), so it looks like
TCP would never see a usable value.

Is this interpretation correct? There's only a handful of drivers
providing CHECKSUM_COMPLETE can anyone who has access verify this?

Thanks,
Tom
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