netdev - Re: [PATCH v2] vlan: allow TSO setting on vlan interfaces

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Message-Id: <1278604198.16013.35.camel@achroite.uk.solarflarecom.com>
Date:	Thu, 08 Jul 2010 16:49:58 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH v2] vlan: allow TSO setting on vlan interfaces

On Thu, 2010-07-08 at 16:43 +0100, Ben Hutchings wrote:
> On Thu, 2010-07-08 at 11:39 +0200, Eric Dumazet wrote:
> > When we need to shape traffic with low speeds, we need to disable tso on
> > network interface :
> > 
> > ethtool -K eth0.2240 tso off
> > 
> > It seems vlan interfaces miss the set_tso() ethtool method.
> > Propagating tso changes from lower device is not always wanted, some
> > vlans want TSO on, others want TSO off.
[...]
> I think the vlan driver should also have a netdev notifier to handle
> feature changes on the underlying device.

To clarify, I think offload features should be disabled on a vlan device
if they are later disabled on the underlying device.  Propagating
changes to enable features, as you say, might not be wanted.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
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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