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

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Message-ID: <20230718112940.2c126677@kernel.org>
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.