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

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Message-ID: <ZLhww+P+7zhTTUk7@ziepe.ca>
Date:   Wed, 19 Jul 2023 20:24:51 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     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: [RFC PATCH 00/10] Device Memory TCP

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.

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

Jason