linux-kernel - Re: [RFC PATCH v4 0/2] RDMA/rxe: Add dma-buf support

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Date:   Tue, 7 Dec 2021 13:14:47 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Shunsuke Mie <mie@...l.co.jp>
Cc:     Zhu Yanjun <zyjzyj2000@...il.com>,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Doug Ledford <dledford@...hat.com>,
        Jianxin Xiong <jianxin.xiong@...el.com>,
        Leon Romanovsky <leon@...nel.org>,
        Maor Gottlieb <maorg@...dia.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-media@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Damian Hobson-Garcia <dhobsong@...l.co.jp>,
        Takanari Hayama <taki@...l.co.jp>,
        Tomohito Esaki <etom@...l.co.jp>
Subject: Re: [RFC PATCH v4 0/2] RDMA/rxe: Add dma-buf support

On Fri, Dec 03, 2021 at 12:51:44PM +0900, Shunsuke Mie wrote:
> Hi maintainers,
> 
> Could you please review this patch series?

Why is it RFC?

I'm confused why this is useful? 

This can't do copy from MMIO memory, so it shouldn't be compatible
with things like Gaudi - does something prevent this?

Jason