linux-kernel - Re: [PATCH 2/2] [e1000 VLAN] Disable vlan hw accel when promiscuous mode

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Message-ID: <20071113121647.GA1330@gondor.apana.org.au>
Date:	Tue, 13 Nov 2007 20:16:47 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	kaber@...sh.net, joonwpark81@...il.com, w@....eu,
	cfriesen@...tel.com, auke-jan.h.kok@...el.com,
	netdev@...r.kernel.org,
	djohnson+linux-kernel@...starentnetworks.com,
	linux-kernel@...r.kernel.org, e1000-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/2] [e1000 VLAN] Disable vlan hw accel when promiscuous mode

On Tue, Nov 13, 2007 at 04:06:24AM -0800, David Miller wrote:
>
> > In other words we can make it so that nobody is in promiscuous
> > mode and therefore have to disable VLAN acceleration *unless*
> > they really want to be in that state.  In which case it would
> > imply that they wish to see everything and therefore we should
> > disable VLAN acceleration.
> 
> This is too complicated, we have multiple unicast MAC support
> in the driver API already, let's simply use it.

Yes I agree.  People not using Patrick's new API deserves to
get poor performance so they can switch over sooner :)

What I was trying to say above is that e1000 currently uses
the old set_multicast_list interface (rather than dev_set_rx_mode)
so it's not immediately obvious why we're in promiscuous mode.
We could look at dev->promiscuity - !!uc_count but that feels a
bit fragile.

Perhaps those who want to push this patch should be encouraged
to convert e1000 to the new interface :)

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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