netdev - Re: [PATCH v2 net-next 0/7] net: foo-over-udp (fou)

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Message-ID: <CA+mtBx_4czWNAPSD7a06OrDyWrgvULu69E0BMKW5-V-UZatB4A@mail.gmail.com>
Date:	Tue, 16 Sep 2014 13:35:30 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	Or Gerlitz <gerlitz.or@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net-next 0/7] net: foo-over-udp (fou)

On Tue, Sep 16, 2014 at 1:04 PM, Or Gerlitz <gerlitz.or@...il.com> wrote:
> On Tue, Sep 16, 2014 at 6:00 PM, Tom Herbert <therbert@...gle.com> wrote:
>> [...] Fortunately, we'll be able to code
>> around mosts of the limitations of deployed NICs that don't implement
>> generic mechanisms (with UDP RSS, checksum conversions,  remote
>> checksum offload) [...]
>
> So UDP RSS is a clear requirement and NICs have it by now.
>
> Re checksum conversions, I assume you mean the ability on the RX path
> to report CHECKSUM_COMPLETE on any sort of IP packet potentially
> having multiple encapsulations, right? how would you phrase (and
> model) the other way around, e.g what is the generic requirement on
> the TX path w.r.t checksum offload?
>
> And I wasn't sure what do you mean by remote checksum offload, can you clarify?
>
This is the part intend to solve TX checksum offload for encapsulation
for "dumb" devices. Unlike, checksum conversion, this one requires a
bit of protocol support so we need an extensible encapsulation header.

http://tools.ietf.org/html/draft-herbert-remotecsumoffload-00

> Or.
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