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

Yevgeny Petrilin [off-list ref] wrote:

Or Gerlitz [or.gerlitz@gmail.com] wrote:

quoted

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.