netdev - Re: [PATCH net-next 3/4] ethtool: Support for configurable RSS hash key.

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Message-ID: <1390455540.3651.136.camel@deadeye.wl.decadent.org.uk>
Date:	Thu, 23 Jan 2014 05:39:00 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Venkata Duvvuru <VenkatKumar.Duvvuru@...lex.Com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 3/4] ethtool: Support for configurable RSS hash
 key.

On Wed, 2014-01-22 at 12:12 +0000, Venkata Duvvuru wrote:
[...]
> > No, what I mean is:
> > 
> > 1. An RX flow steering filter can specify use of RSS, in which case the value
> > looked up in the indirection is added to the queue number specified in the
> > filter.  This is not yet controllable through RX NFC though there is room for
> > extension there.
> > 
> > 2. Multi-function controllers need multiple RSS contexts (key + indirection
> > table) to support independent use of RSS on each function.
> > But it may also be possible to allocate multiple contexts to a single function.
> > This could be useful in conjunction with 1.  But there would need to be a way
> > to allocate and configure extra contexts first.
> The proposed changes will be incremental so I think this can be done
> in a separate patch. Thoughts?

The ethtool ABI (to userland) has to remain backward-compatible, and it
is preferable if we don't add lots of different structures for this.

So please define the new command structure to include both the key and
indirection table, and some reserved space (documented as 'userland must
set to 0') for future extensions.

Ben.

-- 
Ben Hutchings
compatible: Gracefully accepts erroneous data from any source

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