netdev - Re: [net-next-2.6 PATCH 0/6 v4] macvlan: MAC Address filtering support for passthru mode

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Date:	Thu, 17 Nov 2011 16:32:05 -0800
From:	Greg Rose <gregory.v.rose@...el.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	Roopa Prabhu <roprabhu@...co.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"chrisw@...hat.com" <chrisw@...hat.com>,
	"sri@...ibm.com" <sri@...ibm.com>,
	"dragos.tatulea@...il.com" <dragos.tatulea@...il.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"arnd@...db.de" <arnd@...db.de>, "mst@...hat.com" <mst@...hat.com>,
	"mchan@...adcom.com" <mchan@...adcom.com>,
	"dwang2@...co.com" <dwang2@...co.com>,
	"shemminger@...tta.com" <shemminger@...tta.com>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"kaber@...sh.net" <kaber@...sh.net>,
	"benve@...co.com" <benve@...co.com>
Subject: Re: [net-next-2.6 PATCH 0/6 v4] macvlan: MAC Address filtering support
 for passthru mode


On 11/17/2011 4:15 PM, Ben Hutchings wrote:
> Sorry to come to this rather late.
>
> On Tue, 2011-11-08 at 23:55 -0800, Roopa Prabhu wrote:
> [...]
>> v2 ->  v3
>> - Moved set and get filter ops from rtnl_link_ops to netdev_ops
>> - Support for SRIOV VFs.
>>          [Note: The get filters msg (in the way current get rtnetlink handles
>>          it) might get too big for SRIOV vfs. This patch follows existing sriov
>>          vf get code and tries to accomodate filters for all VF's in a PF.
>>          And for the SRIOV case I have only tested the fact that the VF
>>          arguments are getting delivered to rtnetlink correctly. The code
>>          follows existing sriov vf handling code so rest of it should work fine]
> [...]
>
> This is already broken for large numbers of VFs, and increasing the
> amount of information per VF is going to make the situation worse.  I am
> no netlink expert but I think that the current approach of bundling all
> information about an interface in a single message may not be
> sustainable.
>
> Also, I'm unclear on why this interface is to be used to set filtering
> for the (PF) net device as well as for related VFs.  Doesn't that
> duplicate the functionality of ndo_set_rx_mode and
> ndo_vlan_rx_{add,kill}_vid?

Functionally yes but contextually no.  This allows the PF driver to know 
that it is setting these filters in the context of the existence of VFs, 
allowing it to take appropriate action.  The other two functions may be 
called without the presence of SR-IOV enablement and the existence of VFs.

Anyway, that's why I asked Roopa to add that capability.

- Greg

>
> Ben.
>
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