netdev - Re: Re: [PATCH 13/23 v3] mlx4: Unicast Loopback support

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Message-ID: <15ddcffd1002152245l76e85d8dx31298a420fd815ef@mail.gmail.com>
Date:	Tue, 16 Feb 2010 08:45:43 +0200
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Yevgeny Petrilin <yevgenyp@...lanox.co.il>
Cc:	Roland Dreier <rdreier@...co.com>, netdev@...r.kernel.org,
	liranl@...lanox.co.il, Tziporet Koren <tziporet@...lanox.co.il>
Subject: Re: Re: [PATCH 13/23 v3] mlx4: Unicast Loopback support

Yevgeny Petrilin <yevgenyp@...lanox.co.il> wrote:
> Or Gerlitz [or.gerlitz@...il.com] wrote:

>> I wasn't sure what is the use case here, isn't loopback handled by higher levels at the network stack?

> The use case is two VMs using the same physical adapter.

I am still not with you: are you referring to the case where each VM
is being served by a
different VF? in that case, the VF driver (mlx4_en) has no way to know
its a "loopback" packet,
and switching between VFs can be programmed to the PF by the PF driver
(modified mlx4_core).

If you are talking to the case both VMs are being served by the same
PCI function --> same NIC
then again, loopback is handled in higher level.

Is there a 3rd use case?

Or.
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