Re: sr-iov and bridges (mlx4)

On 09/20/2015 05:01 AM, Or Gerlitz wrote:

On Sun, Sep 20, 2015 at 2:58 AM, Matthew Monaco
[off-list ref] wrote:
[...]

quoted

In all cases, VMs with SR-IOV work fine, IP on the host works fine, outbound
DHCP from the virtio VMs work fine, but inbound frames are not making it back to
the VM.

[...]

quoted

Is there a know limitation of mixing SR-IOV and bridges in general? Does the
SR-IOV switch specific to the mlx4 hardware not work well with linux bridges? ...?

It would be a bit hard for bridge based promiscuous environment to work OOB
for one of the functions (PF or VF) in SRIOV, this is generic issue,
and not related
to specific vendor.

You need to use the bridge (8) tool (part of iproute2) and add the P.V
VM MACs to
the PF interface as "self" see some slides  (21/22/23) from netdev 0.1
that deal with that
https://netdev01.org/docs/netdev_tutorial_bridge_makita_150213.pdf

Or.

It also possible to mark one bridge port (the PF) as non-promiscuous,
but I haven't
played with that myself yet (slide 32), so can't just send you doing it...

Many thanks, that helps. Now to figure out the best approach for shoving this
into OpenStack =)