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Re: [Qemu-devel] [PATCH qemu v2] tap: Allow specifying a bridge

From: Jason Wang
Subject: Re: [Qemu-devel] [PATCH qemu v2] tap: Allow specifying a bridge
Date: Thu, 22 Sep 2016 15:05:17 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 2016年09月19日 19:59, Paolo Bonzini wrote:

On 19/09/2016 02:33, Alexey Kardashevskiy wrote:
On 15/09/16 07:04, Paolo Bonzini wrote:

On 13/09/2016 09:11, Alexey Kardashevskiy wrote:
The tap backend is already using qemu-bridge-helper to attach tap
interface to a bridge but (unlike the bridge backend) it always uses
the default bridge name - br0.

This adds a "br" property support to the tap backend.

Signed-off-by: Alexey Kardashevskiy <address@hidden>
Stupid question ahead: how does -netdev bridge compare to -netdev tap
after this patch?  Is there a case left where you must use -netdev bridge?

Or can we make -netdev bridge a synonym for "-netdev
I looked through history but I could not understand why "bridge" was
introduced in the first place as even there (a7c36ee4920ea) is an example of

-netdev tap,helper="/usr/local/libexec/qemu-bridge-helper --br=qemubr0",id=hn0

so it was assumed even then that people might want tap on a specific bridge.

So my stupid question is - what do I have to do to get this accepted
(besides a note that it is 2.8+) or it is not interesting to anyone? :)
I think the patch is even more interesting because it lets us simplify
the code for -netdev bridge.


According to http://wiki.qemu.org/Features-Done/HelperNetworking. Looks like this allows creating a third party backend without modifying qemu. And the bridge helper is an example for this.

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