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Date:	Fri, 21 Nov 2014 01:28:19 +0000
From:	Ben Hutchings <>
To:	Hiroshi Shimamoto <>
Cc:	"" 
	Hayato Momma <>,
	"Choi, Sy Jong" <>,
	"" <>,
	"" <>
Subject: Re: [PATCH] ixgbe: make VLAN filter conditional in SR-IOV case

On Thu, 2014-11-13 at 08:28 +0000, Hiroshi Shimamoto wrote:
> From: Hiroshi Shimamoto <>
> Disable hardware VLAN filtering if netdev->features VLAN flag is dropped.
> In SR-IOV case, there is a use case which needs to disable VLAN filter.
> For example, we need to make a network function with VF in virtualized
> environment. That network function may be a software switch, a router
> or etc. It means that that network function will be an end point which
> terminates many VLANs.
> In the current implementation, VLAN filtering always be turned on and
> VF can receive only 63 VLANs. It means that only 63 VLANs can be used
> and it's not enough at all for building a virtual router.
> With this patch, if the user turns VLAN filtering off on the host, VF
> can receive every VLAN packet.
> The behavior is changed only if VLAN filtering is turned off by ethtool.

What happens when VLAN filtering is turned back on and a VF uses too
many VLANs?  It seems like that should either be prevented (you can't
turn it back on) or the driver should log a message saying the VF is now


Ben Hutchings
Beware of bugs in the above code;
I have only proved it correct, not tried it. - Donald Knuth

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