netdev - Re: [PATCH v1 1/6] net: Generalize udp based tunnel offload

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Message-Id: <20151129.222243.2290113258075462913.davem@davemloft.net>
Date:	Sun, 29 Nov 2015 22:22:43 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	tom@...bertland.com
Cc:	jesse.brandeburg@...el.com, anjali.singhai@...el.com,
	jesse@...nel.org, netdev@...r.kernel.org, kiran.patil@...el.com
Subject: Re: [PATCH v1 1/6] net: Generalize udp based tunnel offload

From: Tom Herbert <tom@...bertland.com>
Date: Tue, 24 Nov 2015 09:32:11 -0800

>>
>> FWIW, I've brought the issue to the attention of the architects here,
>> and we will likely be able to make changes in this space.  Intel
>> hardware (as demonstrated by your patches) already is able to deal with
>> this de-ossification on transmit.  Receive is a whole different beast.
>>
> Please provide the specifics on why "Receive is a whole different
> beast.". Generic receive checksum is already a subset of the
> functionality that you must have implement to support the protocol
> specific offloads. All the hardware needs to do is calculate the 1's
> complement checksum of the packet and return the value on the to the
> host with that packet. That's it. No parsing of headers, no worrying
> about the pseudo header, no dealing with any encapsulation. Just do
> the calculation, return the result to the host and the driver converts
> this to CHECKSUM_COMPLETE. I find it very hard to believe that this is
> any harder than specific support the next protocol du jour.

+1
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