Re: [Qemu-devel] [PATCH 2/3] net: Don't warn about the default network setup

[Peter Maydell <peter.maydell@linaro.org>]

On 23 May 2011 09:30, Markus Armbruster <armbru@redhat.com> wrote:
> Peter Maydell <peter.maydell@linaro.org> writes:
>
>> Don't warn about the default network setup that you get if no command line
>> -net options are specified.  There are two cases that we would otherwise
>> complain about:
>>
>> (1) board doesn't support a NIC but the implicit "-net nic" requested one
>
> Maybe such board should declare no_nic, similar to no_parallel &
> friends.  But that's out of this patch's scope.

I think in the brave new qdev world this kind of thing should be
handled generically by warning about any -device requested devices
which couldn't be plugged into anything sensible.

> This complaint is only added in the next patch, isn't it?  I don't mind.

It won't explicitly say "you asked for a NIC and didn't get one",
but it will make the obscurer complaint "Warning: vlan 0 with no
nics", because the implicit '-net user' is then not connected to
anything. I was deliberately slightly vague with the comment text
so it would be true both before and after the following patch :-)

>> (2) CONFIG_SLIRP not set, so the implicit "-net nic" sets up a nic that
>> isn't connected to anything
>
> This one's already there, I think.

No, without this patch qemu will complain
"Warning: vlan 0 is not connected to host network" if you configured
with --disable-slirp.

(--disable-slirp seems to have been left out of configure --help;
I assume that's an oversight.)

-- PMM