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

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Date: Tue, 18 Jul 2023 11:29:40 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: David Ahern <dsahern@...nel.org>
Cc: Jason Gunthorpe <jgg@...pe.ca>, 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 Tue, 18 Jul 2023 12:20:59 -0600 David Ahern wrote:
> 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.

There's one RSS context for may datapath sockets. Plus a lot of the
APIs already exist, and it's more of a question of packaging them up 
at the user space level. For things which do not have an API, however,
netlink, please.