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Re: [Qemu-devel] [RFC PATCH] net: Enable vlans and dump for -netdev, too

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [RFC PATCH] net: Enable vlans and dump for -netdev, too,
Date: Tue, 26 May 2015 13:52:35 +0100
User-agent: Mutt/1.5.23 (2014-03-12)

On Fri, May 22, 2015 at 09:22:19PM +0200, Thomas Huth wrote:
> So far, it is not possible to use the network dump interface
> with the "-netdev" option yet, it only works with the legacy
> "-net" option. To be able to use it with "-netdev", too, this
> patch now enables the "vlan" packet distribution for the
> "-netdev" option, too, so that you can now dump network packets
> like this:
> qemu... -device e1000,netdev=myhub -netdev hubport,hubid=1,id=myhub \
>         -netdev user,id=n1,vlan=1,tftp=/tmp/tftp,bootfile=zImage \
>         -netdev dump,id=n2,vlan=1,file=/tmp/dump.dat
> Signed-off-by: Thomas Huth <address@hidden>
> ---
>  net/net.c        | 3 +++
>  qapi-schema.json | 1 +
>  2 files changed, 4 insertions(+)
>  [Note: I'm quite new to this area of the code, please review carefully
>   whether this approach makes sense or whether it should be done differently]

We thought the QEMU "vlan" concept would be dropped completely in the
future, so it was never added to -netdev.  No patches to do that have
been posted over the years, so I think it was more of a conceptual goal
than a concrete requirement.

I'm okay with merging this but will leave some time for discussion
before merging the patch.

"Speak now or forever hold your peace"


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