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:
[...]

quoted

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.