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Date: Mon, 29 Jun 2015 16:34:28 -0700
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Subject: Re: netmap custom RSS and custom packet info
From: Adrian Chadd <adrian.chadd@gmail.com>
To: Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc: Navdeep Parhar <np@freebsd.org>, FreeBSD Net <freebsd-net@freebsd.org>
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On 29 June 2015 at 12:11, Slawa Olhovchenkov <slw@zxy.spb.ru> wrote:
> On Mon, Jun 29, 2015 at 10:29:14AM -0700, Adrian Chadd wrote:
>
>> Hi,
>>
>> Turns out there are a class of symmetric RSS Toeplitz keys. Use google
>> to find the paper. :)
>
> Do someone work on using different RSS keys and hash fields (selecting
> L2/L3/L4 or just L3 hash for example) in FreeBSD?

The -HEAD RSS stuff has a global set of (compiled in) config options
that say whether L2/L3 RSS hashing is enabled. It's more complicated
than that, as the alignment of RSS NIC config, expected RSS hash info
and the tcp/udp pcb table hashing has to align, or weird stuff
happens.

It still needs a bunch more work. Unfortunately it's not in my "would
be useful for work" right at the moment, so other things are taking
priority.



-adrian