netdev - Re: [PATCH v2] ixgbe: make VLAN filter conditional

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Date:	Fri, 06 Mar 2015 01:34:16 -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>,
	"ben@...adent.org.uk" <ben@...adent.org.uk>
Subject: Re: [PATCH v2] ixgbe: make VLAN filter conditional

On Fri, 2015-03-06 at 06:04 +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
> terminated
> > in one NIC.
> > 
> > With this patch, if the user turns VLAN filtering off on the host,
> VF
> > can receive every VLAN packet.
> > 
> > This VLAN filtering can be turned on or off when SR-IOV is disabled,
> if not
> > the operation is rejected.
> 
> Hi,
> 
> any comment about this?
> I added a warning message and prevent operation during SR-IOV is
> enabled.

Yes, the warning message you added says nothing of the huge security
hole this exposes.  We need a message the correctly expresses the
dangers in turning this off.

Also it does not appear that you addressed Ben Hutchings concerns, as I
asked.  Correct me if I am wrong and you did address Ben's concerns.

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