[Qemu-devel] Re: [PATCH 0/8] vlan cleanup

[Jan Kiszka <jan.kiszka@web.de>]

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Anthony Liguori wrote:
> On 07/13/2010 07:48 AM, Jan Kiszka wrote:
>> Miguel Di Ciurcio Filho wrote:
>>   
>>> On Tue, Jul 13, 2010 at 3:16 AM, Jan Kiszka<jan.kiszka@web.de>  wrote:
>>>     
>>>> Miguel Di Ciurcio Filho wrote:
>>>>       
>>>>> This series removes the vlan stuff without mercy. I've tried to
>>>>> make the steps
>>>>> as small as possible, but the last one is huge. I did some basic
>>>>> tests and
>>>>> networking is still working, so reviews are welcome :-D
>>>>>          
>>>> Sorry, this is a bit too rude. This not only removes the vlan model,
>>>> something one may talk about, but also the innocent socket back-ends
>>>> and
>>>> the useful pcap dump support.
>>>>
>>>> Socket back-ends allow quick and easy unprivileged inter-VM network
>>>> setups. Nothing for production systems, but useful for testing purposes
>>>> on boxes where taps are not allowed or unhandy to configure.
>>>>
>>>>        
>>> I agree that it might be handy sometimes, but one could use VDE for
>>> that too. Runs on user-space and can be tunneled over SSH or netcat
>>> [1].
>>>      
>> Yes, I know. But it requires yet another process as hop. In contrast,
>> peer-to-peer sockets used to be as fast as taps in certain setup (now
>> taps became faster again).
>>    
> 
> Dump is critical to maintain.
> 
> sockets is not terribly useful without vlan.  Honestly, I have a hard
> time agreeing that it's terribly useful to begin with.  I don't buy an
> argument about "ease-of-use" because how to properly configure the
> sockets backend is not at all obvious.

Old style:
 -net socket,listen=:12345
plus
 -net socket,connect=127.0.0.1:12345
and you have linked two VMs. New style would be less handy (unless we
map -net on -netdev once vlans are gone), but still following the same
pattern.

I bet there is only a minor bit missing to get "-netdev socket" working,
given that slirp apparently works. If I had time, I would look into this.

Jan


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