[ovs-dev] [PATCH v2 6/8] netdev-dpdk: retry with queue action

Yuanhan Liu yliu at fridaylinux.org
Mon Sep 11 07:55:52 UTC 2017


On Mon, Sep 11, 2017 at 07:42:19AM +0000, Chandran, Sugesh wrote:
> 
> 
> Regards
> _Sugesh
> 
> 
> > -----Original Message-----
> > From: ovs-dev-bounces at openvswitch.org [mailto:ovs-dev-
> > bounces at openvswitch.org] On Behalf Of Yuanhan Liu
> > Sent: Tuesday, September 5, 2017 10:23 AM
> > To: dev at openvswitch.org
> > Subject: [ovs-dev] [PATCH v2 6/8] netdev-dpdk: retry with queue action
> > 
> > From: Finn Christensen <fc at napatech.com>
> > 
> > AFAIK, most (if not all) NICs (including Mellanox and Intel) do not support a
> > pure MARK action.  It's required to be used together with some other
> > actions, like QUEUE.
> > 
> > To workaround it, retry with a queue action when first try failed.
> [Sugesh] This means a NIC that doesn't support pure MARK, will
> do every flow install twice no matter how many times the flow install failed before for the same reason. 
> The retry can be avoided if we know what a port/NIC can support. It leads to a need of feature discovery of a NIC
> at the init time.

I believe the reply I made to Simon answered all questions you asked above.

	--yliu


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