linux-kernel - Re: [PATCH] RDMA/mlx4: Spread completion vectors for proxy CQs

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Date:   Wed, 20 Feb 2019 10:14:41 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Håkon Bugge <haakon.bugge@...cle.com>
Cc:     Chuck Lever <chuck.lever@...cle.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Doug Ledford <dledford@...hat.com>, jackm@....mellanox.co.il,
        majd@...lanox.com, OFED mailing list <linux-rdma@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/mlx4: Spread completion vectors for proxy CQs

On Tue, Feb 19, 2019 at 06:32:50PM +0100, Håkon Bugge wrote:
>    Anyway, Jason mentioned in a private email that maybe we could use the
>    new completion API or something? I am not familiar with that one
>    (yet).

I was thinking of the stuff in core/cq.c - but it also doesn't have
automatic comp_vector balancing. It is the logical place to put
something like that though..

An API to manage a bundle of CPU affine CQ's is probably what most
ULPs really need.. (it makes little sense to create a unique CQ for
every QP)

alloc_bundle()
get_cqn_for_flow(bundle)
alloc_qp()
destroy_qp()
put_cqn_for_flow(bundle)
destroy_bundle();

Let the core code balance the cqn's and allocate (shared) CQ
resources.

Jason