lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 21 Nov 2014 09:22:19 +0000
From:	Hiroshi Shimamoto <>
To:	Ben Hutchings <>
CC:	"" 
	Hayato Momma <>,
	"Choi, Sy Jong" <>,
	"" <>,
	"" <>
Subject: RE: [PATCH] ixgbe: make VLAN filter conditional in SR-IOV case

> 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
> broken.

that's reasonable.
Will submit additional patch to take care about that.


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

Powered by blists - more mailing lists