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

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Message-ID: <dfe4bae7-13a0-3c5d-d671-f61b375cb0b4@gmail.com>
Date:   Thu, 27 Jul 2023 13:40:21 +0200
From:   Christian König <ckoenig.leichtzumerken@...il.com>
To:     Jason Gunthorpe <jgg@...pe.ca>,
        Stephen Hemminger <stephen@...workplumber.org>
Cc:     Mina Almasry <almasrymina@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Ahern <dsahern@...nel.org>,
        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: [Linaro-mm-sig] Re: [RFC PATCH 00/10] Device Memory TCP

Am 20.07.23 um 01:24 schrieb Jason Gunthorpe:
> On Wed, Jul 19, 2023 at 10:57:11AM -0700, Stephen Hemminger wrote:
>
>> Naive idea.
>> Would it be possible for process to use mmap() on the GPU memory and then
>> do zero copy TCP receive some how? Or is this what is being proposed.
> It could be possible, but currently there is no API to recover the
> underlying dmabuf from the VMA backing the mmap.

Sorry for being a bit late, have been on vacation.

Well actually this was discussed before to work around problems with 
Windows applications through wine/proton.

Not 100% sure what the outcome of that was, but if I'm not completely 
mistaken getting the fd behind a VMA should be possible.

It might just not be the DMA-buf fd, because we use mmap() re-routing to 
be able to work around problems with the reverse tracking of mappings.

Christian.

>
> Also you can't just take arbitary struct pages from any old VMA and
> make them "netmem"
>
> Jason
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