[Qemu-devel] adding a parameter in qemu tap option

[Qemu-devel] adding a parameter in qemu tap option

[William Dauchy]

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Hi,

I'm trying to understand how to add a parameter in tap option.

I currently have a working config for a vm; i.e several interfaces using
multiqueues.
I had a try with:

--- a/qapi-schema.json
+++ b/qapi-schema.json
 -2006,6 +2008,7 @@
 ##
 { 'type': 'NetdevTapOptions',
   'data': {
+    '*foo':        'str',
     '*ifname':     'str',
     '*fd':         'str',
     '*fds':        'str',

i.e just adding a foo parameter; nothing change in my config file (I'm
using -readconfig option and not cmdline)
multiqueue is no longer working in some cases.

I don't get how is it possible. I don't even understand why I don't have
the same behaviour using the cmdline.

Maybe I forgot something obvious.
Does someone has some hints?

Thanks,
-- 
William

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Re: [Qemu-devel] adding a parameter in qemu tap option

[Stefan Hajnoczi]

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On Fri, Aug 22, 2014 at 10:27:35AM +0200, William Dauchy wrote:
> Hi,
> 
> I'm trying to understand how to add a parameter in tap option.
> 
> I currently have a working config for a vm; i.e several interfaces using
> multiqueues.
> I had a try with:
> 
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
>  -2006,6 +2008,7 @@
>  ##
>  { 'type': 'NetdevTapOptions',
>    'data': {
> +    '*foo':        'str',
>      '*ifname':     'str',
>      '*fd':         'str',
>      '*fds':        'str',
> 
> i.e just adding a foo parameter; nothing change in my config file (I'm
> using -readconfig option and not cmdline)
> multiqueue is no longer working in some cases.
> 
> I don't get how is it possible. I don't even understand why I don't have
> the same behaviour using the cmdline.
> 
> Maybe I forgot something obvious.
> Does someone has some hints?

I don't see any obvious reason from the small diff you have posted.  Are
you sure this is the only change you've made and the environment is
unchanged?

Stefan

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Re: [Qemu-devel] adding a parameter in qemu tap option

[William Dauchy]

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Hi Stefan,

Thanks for you answer.

On Aug22 14:22, Stefan Hajnoczi wrote:
> I don't see any obvious reason from the small diff you have posted.  Are
> you sure this is the only change you've made and the environment is
> unchanged?

absolutely. I suspect a bug related to options coming from the config file
because I dont have any issue if I pass the config through command line.

-- 
William

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