netdev - Re: [RFC PATCH v2 02/11] netdev: implement netlink api to bind dma-buf to netdevice

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Message-ID: <462ccad0-867e-3ef3-ca78-59d8a6e451b3@kernel.org>
Date: Mon, 21 Aug 2023 20:19:47 -0700
From: David Ahern <dsahern@...nel.org>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc: Jakub Kicinski <kuba@...nel.org>, Mina Almasry <almasrymina@...gle.com>,
 Praveen Kaligineedi <pkaligineedi@...gle.com>, netdev@...r.kernel.org,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>,
 Magnus Karlsson <magnus.karlsson@...el.com>, sdf@...gle.com,
 Willem de Bruijn <willemb@...gle.com>, Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [RFC PATCH v2 02/11] netdev: implement netlink api to bind
 dma-buf to netdevice

On 8/19/23 8:18 AM, Willem de Bruijn wrote:
> That may be an incentive for vendors to support per-queue
> start/stop/alloc/free. Maybe the ones that support RDMA already do?

I looked at most of the H/W RDMA in-tree kernel drivers today, and all
of them hand-off create_qp to firmware. I am really surprised by that
given that many of those drivers work with netdev. I am fairly certain
mlx5 and ConnectX 5-6, for example, can be used to achieve the
architecture we proposed at netdev [1], so I was expecting a general
queue management interface.

Between that and a skim of the providers (userspace side of it), the IB
interface may be a dead-end from the perspective of the goals here.

[1]
https://netdevconf.info/0x16/slides/34/netdev-0x16-Merging-the-Networking-Worlds-slides.pdf,
slide 14.