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Date:	Sun, 21 Dec 2014 08:33:56 -0800 (PST)
From:	Shrijeet Mukherjee <>
To:	jhs <>
Cc:	John Fastabend <>,
	Hubert Sokolowski <>,
	roopa <>,,
	Vlad Yasevich <>
Subject: Re: SRIOV as bridge Re: [PATCH net-next RESEND] net: Do not call
 ndo_dflt_fdb_dump if ndo_fdb_dump is defined.

----- Original Message -----
> From: "jhs" <>
> To: "John Fastabend" <>
> Cc: "Hubert Sokolowski" <>, "roopa" <>,, "Vlad
> Yasevich" <>, "Shrijeet Mukherjee" <>
> Sent: Sunday, December 21, 2014 6:27:46 AM
> Subject: SRIOV as bridge Re: [PATCH net-next RESEND] net: Do not call ndo_dflt_fdb_dump if ndo_fdb_dump is defined.

> Sorry for the latency, Ive been down with a bad flu (its bad when i cant
> type on my keyboard sitting infront of me;->),  recovering and the
> thread seems to have caught on - should be able to catchup in the
> next few days.
> I am beginning to reach a conclusion that the current switchdev approach
> is *not* going to work for SRIOV. I also worry it may be too late
> to change that.
> Shrijeet wanted to set up a BOF for netdev to have hopefully final
> consensus. Shrijeet, are you going to make an official request for the BOF?

Yes, will write something up tonite. The point you make about the PF being the TheClassThingy is what make the merging of models possible IMO.

> Sorry John, I dont have enough energy to address all your points but i
> will try to just focus on SRIOV and will save a few bytes while at it.
> On 12/16/14 11:35, John Fastabend wrote:
>> But in the SR-IOV case you have multiple "Cpu ports" and you want
>> to send packets to each of them depending on the configuration.
>>     port0   port1     port2  port3
>>      |        |        |      |      uplinks
>>   +------------------------------+
>>   |                              |
>>   |       SRIOV edge relay       |
>>   |                              |
>>   +------------------------------+
>>                   |                   downlink
> Two points above:
> 1) Did you flip uplink vs down link above?
> (I Thought URP was the wire link)
> 2) What you are not showing above which is *very important* is that
> infact there is an underlying embedded fdb.
> point #2 brings out a lot of the weird things in some of the bridge
> code. IOW, you have an *offloaded* bridge with _bridge ports_
> visible in the kernel but not the bridge that is controlled
> by standard Linux bridge tools. I am not saying that the model is
> wrong; on the contrary what Ben had exposed may fall under the
> same category i.e you have E_BRIDGE flag on the netdev to say it sits
> on top of an offloaded bridge and you dont need a br0 to run
> bridge command on. But then we need some proxy (TheClassThingy) to act
> as intemediary to the offloaded hardware.
> If you do that then the vf becomes simply a bridge port - which
> means bridge port ops apply.
> SRIOV it seems to have morphed its own toolkit.
> The PF port, when acting as the control interface, is actually
> TheClassThingy we discuss on/off.
> To add an fdb entry to point to vf 1, where TheClassThingy is eth1:
> ip link set eth1 vf 1 mac aa:bb:cc:dd:ee:ff vlan 10
> IMO, SRIOV should expose these ports with names and ifindices
> (probably does already) and pre-populated master or something
> which points to its parent, then i can do the following:
> bridge fdb add aa:bb:cc:dd:ee:ff vlan 10 dev vf1 master
> master in such a case will go to TheClassThingy which would pass
> such control to the underlying hardware.
> The PF still stays but not as the management interface.
> Ok, promised to keep this short ;-> I should respond to the other points
> in a separate email.
> cheers,
> jamal
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