linux-kernel - Re: [RFC PATCH v2 0/2] RDMA/rxe: Add dma-buf support

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Date:   Sun, 10 Oct 2021 23:31:58 +0800
From:   Zhu Yanjun <zyjzyj2000@...il.com>
To:     Shunsuke Mie <mie@...l.co.jp>
Cc:     Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        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, LKML <linux-kernel@...r.kernel.org>,
        RDMA mailing list <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 v2 0/2] RDMA/rxe: Add dma-buf support

On Wed, Sep 29, 2021 at 12:19 PM Shunsuke Mie <mie@...l.co.jp> wrote:
>
> This patch series add a dma-buf support for rxe driver.
>
> A dma-buf based memory registering has beed introduced to use the memory
> region that lack of associated page structures (e.g. device memory and CMA
> managed memory) [1]. However, to use the dma-buf based memory, each rdma
> device drivers require add some implementation. The rxe driver has not
> support yet.
>
> [1] https://www.spinics.net/lists/linux-rdma/msg98592.html

It seems that dma-buf is in discussion. We will focus on this discussion.
After dma-buf is accepted, we will check this dma-buf on rxe.

Zhu Yanjun

>
> To enable to use the dma-buf memory in rxe rdma device, add some changes
> and implementation in this patch series.
>
> This series consists of two patches. The first patch changes the IB core
> to support for rdma drivers that has not dma device. The secound patch adds
> the dma-buf support to rxe driver.
>
> Related user space RDMA library changes are provided as a separate patch.
>
> v2:
> * Rebase to the latest linux-rdma 'for-next' branch (5.15.0-rc1+)
> * Instead of using a dummy dma_device to attach dma-buf, just store
>   dma-buf to use software RDMA driver
> * Use dma-buf vmap() interface
> * Check to pass tests of rdma-core
> v1: https://www.spinics.net/lists/linux-rdma/msg105376.html
> * The initial patch set
> * Use ib_device as dma_device.
> * Use dma-buf dynamic attach interface
> * Add dma-buf support to rxe device
>
> Shunsuke Mie (2):
>   RDMA/umem: Change for rdma devices has not dma device
>   RDMA/rxe: Add dma-buf support
>
>  drivers/infiniband/core/umem_dmabuf.c |  20 ++++-
>  drivers/infiniband/sw/rxe/rxe_loc.h   |   2 +
>  drivers/infiniband/sw/rxe/rxe_mr.c    | 118 ++++++++++++++++++++++++++
>  drivers/infiniband/sw/rxe/rxe_verbs.c |  34 ++++++++
>  drivers/infiniband/sw/rxe/rxe_verbs.h |   2 +
>  include/rdma/ib_umem.h                |   1 +
>  6 files changed, 173 insertions(+), 4 deletions(-)
>
> --
> 2.17.1
>