netdev - Re: How do I know my driver support RSS?

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Message-ID: <1330819855.8460.291.camel@deadeye>
Date:	Sun, 4 Mar 2012 00:10:55 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Yuehai Xu <yuehaixu@...il.com>
CC:	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>, <yhxu@...ne.edu>,
	<sbw@....edu>
Subject: Re: How do I know my driver support RSS?

On Sat, 2012-03-03 at 16:25 -0500, Yuehai Xu wrote:
[...]
> Since I read the following statements from a paper, "we use a separate
> hardware receive and transmit queue for each core and configure the
> IXGBE to inspect the port number in each incoming packet header, place
> the packet on the queue dedicated to the associated memcached's core,
> and deliver the receive interrupt to that core." and the background of
> this configuration is that each memcached is pinned to a separate core
> and has its own UDP port. It seems that IXGBE's driver can detect UDP
> packets according to their port numbers and put these packets into
> corresponding receive queues in the hardware, is this achieved by
> configuring RSS in IXGBE? If it is, I am wondering whether bnx2
> supports RSS and whether it can configure in the same way.
> 
> I appreciate any help for this.

You're confusing RSS (flow hashing) with flow steering.  These are both
explained in Documentation/network/scaling.txt.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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