Re: [PATCH 2/2][RFC] virtio_net: Add MAC fitler table support

Anthony Liguori
2009-01-10T19:41:28Z

Alex Williamson wrote:
> Hmm, that's not quite how I was implementing it. The uc_list and
> mc_list are stored up in the netdev level, so there's not much point in
> duplicating it in the guest virtio-net driver. The interface I was
> working on has two commands. The first tells the host to allocate the
> MAC filter table for a guest provided number of entries (perhaps a
> module parameter, with reasonable default). The other is a set command
> with an sg entry providing a buffer of all the MAC entries for the
> table. If sg entries are no more than a page, this limits us to ~680
> MAC table entries, which I think is far more than any piece of real
> hardware (and large enough that you'd probably want to turn on
> promiscuous already).

Yeah, this is what I would have done although maybe it's worth allowing
a partial update of the filter table. Once you're using a command
interface, a protocol like you describe makes sense. I was simply going
the through the logic that led me to suggest a command interface in the
first place.

> The VLAN equivalent is a bit easier since by
> definition there are 4k possible VLANs. There I think a set bit/clear
> bit message interface is appropriate (and maybe a clear all for a reset
> condition). Let me know if that sounds reasonable. Thanks,
>

Yeah, sounds reasonable to me.

Regards,

Anthony Liguori

> Alex
>
>