netdev - RE: [RFC PATCH 1/4] net: Add support to netdev ops for changing hardware queue MAC and VLAN filters

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Message-Id: <1258642493.2837.8.camel@achroite.uk.solarflarecom.com>
Date:	Thu, 19 Nov 2009 14:54:53 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Williams, Mitch A" <mitch.a.williams@...el.com>
Cc:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"shemminger@...tta.com" <shemminger@...tta.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>
Subject: RE: [RFC PATCH 1/4] net: Add support to netdev ops for changing
	hardware queue MAC and VLAN filters

On Wed, 2009-11-18 at 16:33 -0700, Williams, Mitch A wrote:
[...]
> In the case of SR-IOV on our hardware, these filters are perfect - no
> hash tables are required. (We do use hash tables when we have a bunch
> of multicast addresses, but that's not what this is about.)
> 
> MAC filters deny packets by default, so you won't get anything without
> a valid MAC filter on the queue.
> 
> A queue with no VLAN filters will receive packets from all VLANs,
> albeit with the tags passed up intact.  So in that sense, the VLAN
> filters are default-allow.  
> 
> However, once you enable any VLAN filter, the hardware starts
> stripping tags and begins to deny packets by default.
>
> Based on these semantics, the filtering operation that I've described
> above makes perfect sense.
[...]

But they are not the semantics we would want in supposedly generic
netdev operations.

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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