netdev - Re: [E1000-devel] [PATCH] ixgbe: make VLAN filter conditional in SR-IOV case

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Message-ID: <1424848839.2553.34.camel@jtkirshe-mobl>
Date:	Tue, 24 Feb 2015 23:20:39 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Cc:	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Choi, Sy Jong" <sy.jong.choi@...el.com>,
	Hayato Momma <h-momma@...jp.nec.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [E1000-devel] [PATCH] ixgbe: make VLAN filter conditional in
 SR-IOV case

On Wed, 2015-02-25 at 00:51 +0000, Hiroshi Shimamoto wrote:
> > Subject: Re: [E1000-devel] [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 <h-shimamoto@...jp.nec.com>
> > >
> > > 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.
> > >
> > > Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
> > > CC: Choi, Sy Jong <sy.jong.choi@...el.com>
> > > ---
> > >  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c  | 10 ++++++++++
> > >  drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c |  4 ++++
> > >  2 files changed, 14 insertions(+)
> > 
> > Thanks Hiroshi, I will add your patch to my queue.
> 
> How about this patch?
> It hasn't been in your tree,.
> Is there any issue?

This patch was dropped for two reasons.  First was Ben Hutchings issues
with the patch needed to be addressed.  Second, was due to a possible
security hole which is why VLAN filtering was not disabled in SRIOV
mode, where isolation is lost between VMs.

If you want to continue going forward with this change, a warning
message should be added, at least, warning the user of the possible
security issues.

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