netdev - Re: [RFC PATCH 00/10] Device Memory TCP

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Message-ID: <35f3ec37-11fe-19c8-9d6f-ae5a789843cb@kernel.org>
Date: Tue, 18 Jul 2023 12:20:59 -0600
From: David Ahern <dsahern@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>
Cc: Mina Almasry <almasrymina@...gle.com>, Andy Lutomirski <luto@...nel.org>,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
 netdev@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-kselftest@...r.kernel.org, Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Jesper Dangaard Brouer <hawk@...nel.org>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>, Arnd Bergmann
 <arnd@...db.de>, Willem de Bruijn <willemdebruijn.kernel@...il.com>,
 Shuah Khan <shuah@...nel.org>
Subject: Re: [RFC PATCH 00/10] Device Memory TCP

On 7/18/23 12:15 PM, Jakub Kicinski wrote:
> On Tue, 18 Jul 2023 15:06:29 -0300 Jason Gunthorpe wrote:
>> netlink feels like a weird API choice for that, in particular it would
>> be really wrong to somehow bind the lifecycle of a netlink object to a
>> process.
> 
> Netlink is the right API, life cycle of objects can be easily tied to
> a netlink socket.

That is an untuitive connection -- memory references, h/w queues, flow
steering should be tied to the datapath socket, not a control plane socket.