[PATCH] link: Support RTEXT_FILTER_VF

[Oliver, Jef]

> > Extend rtnl_link_build_get_request() and link_request_update() to 
> > provide IFLA_EXT_MASK with RTEXT_FILTER_VF.
> > 
> > Define RTEXT_FILTER_VF
> > 
> > This enables rtnl_link_get_num_vf to properly return the number of VFs 
> > defined for a link.
> > 
> > Signed-off-by: Jef Oliver <jef.oliver at intel.com>
>
> Hi,
>
>
> this patch applies on libnl3_2_27, but not on current master.
>
>
> It conflicts with
> https://github.com/thom311/libnl/commit/1b2c247571c748a422864f9122bd16cb20e37f83
> which adds ao_get_af().
>
> See also
> https://github.com/thom311/libnl/commit/05631628a57ce88fe1c884680eac6e00fcca810d
>
>
> Any chance, to rebase your patch onto master?
>
>
> Thanks,
> Thomas
>

SRIOV VFs are an extension to the link they are on. They do not register as a separate device unless a VF driver is loaded. Even in that case, the VF exposed by the VF driver appears to be a standard link. Looking at ao_get_af(), it is looking for a rtnl_link_af_ops struct registered for a family. Would I be correct in thinking I need to create this struct for the default link and register it at link_init() ? (This would attach to AF_UNSPEC since SRIOV does not have its own address family?)

This could be expanded to a module (similar to bridge) later when VF info parsing is completed. As of now, the proper count of VFs needs to be returned.

Thanks,
Jef