netdev - Re: [PATCH 0/2][RFC] virtio

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Message-ID: <4964FAFE.2040206@codemonkey.ws>
Date:	Wed, 07 Jan 2009 12:57:02 -0600
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	Alex Williamson <alex.williamson@...com>
CC:	Rusty Russell <rusty@...tcorp.com.au>, kvm <kvm@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Mark McLoughlin <markmc@...hat.com>
Subject: Re: [PATCH 0/2][RFC] virtio_net: MAC filtering

Alex Williamson wrote:
> On Wed, 2009-01-07 at 12:14 -0600, Anthony Liguori wrote:
>   
>> Alex Williamson wrote:
>>     
>>> As noted in the RFC thread adding the kvm/qemu backing, this does
>>> increase the size of the virtio-net device I/O port space, up to 1kB
>>> with PCI rounding if we add a 4k entry VLAN bitmap.  A 64 device limit
>>> is still pretty high for a VM, but maybe we should think about adding
>>> MMIO space for virtio-pci.  Thanks,
>>>   
>>>       
>> I'm not quite sure the best way to address this.  Maybe another control 
>> queue for sending commands to control this sort of stuff?  What are your 
>> thoughts Rusty?
>>     
>
> This is also a good time to decide if a fixed 16 entry MAC filter table
> is sufficient.  Should the size be programmed into the config space?
> There's plenty of room to make it a bigger fixed size and still stay at
> 1kB of I/O port space with the VLAN table.  This implementation is a
> little wasteful of space in using 8 bytes to store the MAC and a valid
> bit, but I suspect there's some endian issues I'm ignoring and a
> standard data type might make that easier later.
>   

If we switch to a command queue, then there's no need to have any fixed 
limitation.

Regards,

Anthony Liguori

> Alex
>
>   

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