netdev - L2 switching in igb

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Date:	Thu, 3 Sep 2009 12:16:06 +0300 (IDT)
From:	Or Gerlitz <ogerlitz@...taire.com>
To:	Alexander Duyck <alexander.duyck@...il.com>
cc:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Fischer, Anna" <anna.fischer@...com>, netdev@...r.kernel.org
Subject: L2 switching in igb

Hi Alex, Jeff

I see that igb_vmm_control enables L2 switch functionality & replication of
multicast/broadcast packets across multiple pools (it calls both
igb_vmdq_set_loopback/replication_pf with true).

I wanted to check few related things with you:

First, what you think would be the correct method for letting the user control
if she wants the NIC to operate in VEPA mode (e.g forward VF/VF traffic to an
outside bridge and let the later do a Uturn) or to handle VF/VF traffic
internally? maybe it can be part or extension of the kernel DCB netlink API?

second, does igb_vmdq_set_replication_pf cause multicast packets to be
replicated to all VFs? I see that after invoking igb_vmm_control, there's
a call to igb_set_vmolr which sets the "Accept packets matched in MTA"
bit, so I wasn't sure what's is the final result, will the PF flood all
multicast packets and the VF accept only those that have a match in the MTA?

Or.
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