netdev - Re: [net-next 08/11] e1000e: add Receive Packet Steering (RPS) support

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Message-ID: <1325624728.2832.12.camel@bwh-desktop>
Date:	Tue, 3 Jan 2012 21:05:28 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
CC:	<davem@...emloft.net>, Bruce Allan <bruce.w.allan@...el.com>,
	<netdev@...r.kernel.org>, <gospo@...hat.com>, <sassmann@...hat.com>
Subject: Re: [net-next 08/11] e1000e: add Receive Packet Steering (RPS)
 support

On Tue, 2012-01-03 at 11:19 -0800, Jeff Kirsher wrote:
> From: Bruce Allan <bruce.w.allan@...el.com>
> 
> Enable RPS by default.  Disallow jumbo frames when both receive checksum
> and receive hashing are enabled because the hardware cannot do both IP
> payload checksum (enabled when receive checksum is enabled when using
> packet split which is used for jumbo frames) and provide RSS hash at the
> same time.
[...]

This doesn't seem to have much to do with RPS.  RPS can use a hardware
hash but doesn't require it.

You should also implement the ethtool command to query flow hashing
behaviour (ETHTOOL_GRXFH command, get_rxnfc operation).

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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