netdev - Re: [PATCH net-next 0/7] gue: Remote checksum offload

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAEP_g=88Q155PxTm9qbNVuxevqDneH3bed0nRfw1nKnZEKvMfQ@mail.gmail.com>
Date:	Mon, 3 Nov 2014 13:26:27 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 0/7] gue: Remote checksum offload

On Sat, Nov 1, 2014 at 3:57 PM, Tom Herbert <therbert@...gle.com> wrote:
> This patch set implements remote checksum offload for
> GUE, which is a mechanism that provides checksum offload of
> encapsulated packets using rudimentary offload capabilities found in
> most Network Interface Card (NIC) devices. The outer header checksum
> for UDP is enabled in packets and, with some additional meta
> information in the GUE header, a receiver is able to deduce the
> checksum to be set for an inner encapsulated packet. Effectively this
> offloads the computation of the inner checksum. Enabling the outer
> checksum in encapsulation has the additional advantage that it covers
> more of the packet than the inner checksum including the encapsulation
> headers.

Tom, I have a pretty hard time squaring this with your previous
comments on hardware offload. This looks almost identical to a
protocol-specific hardware offload to me in terms of the implications
on the stack. It actually is more invasive and less likely to scale
across protocols, so the relative cost/benefit doesn't really add up
in my mind.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html