linux-kernel - Re: [for-next PATCH v5 00/11] RDMA/rxe: Add RDMA FLUSH operation

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Date:   Fri, 11 Nov 2022 15:08:11 +0800
From:   Yanjun Zhu <yanjun.zhu@...ux.dev>
To:     "lizhijian@...itsu.com" <lizhijian@...itsu.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Bob Pearson <rpearsonhpe@...il.com>,
        Leon Romanovsky <leon@...nel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Zhu Yanjun <zyjzyj2000@...il.com>,
        "yangx.jy@...itsu.com" <yangx.jy@...itsu.com>,
        "Yasunori Gotou (Fujitsu)" <y-goto@...itsu.com>,
        "mbloch@...dia.com" <mbloch@...dia.com>,
        "liangwenpeng@...wei.com" <liangwenpeng@...wei.com>,
        "tom@...pey.com" <tom@...pey.com>,
        "tomasz.gromadzki@...el.com" <tomasz.gromadzki@...el.com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [for-next PATCH v5 00/11] RDMA/rxe: Add RDMA FLUSH operation


在 2022/11/11 14:38, lizhijian@...itsu.com 写道:
>
> On 11/11/2022 14:30, Yanjun Zhu wrote:
>>> After these patches, only RXE device can register *FLUSHABLE* MRs
>>> successfully. If mlx try that, EOPNOSUPP will be returned.
>>>
>>> Similarly, Since other hardwares(MLX for example) have not supported
>>> FLUSH operation, EOPNOSUPP will be returned if users try to to that.
>>>
>>> In short, for RXE requester, MLX responder will return error for the
>>> request. MLX requester is not able to request a FLUSH operation.
>> Thanks. Do you mean that FLUSH operation is only supported in RXE? ^_^
>>
>> And MLX does not support FLUSH operation currently?
> IMO, FLUSH and Atomic Write are newly introduced by IBA spec 1.5
> published in 2021. So hardware/drivers(MLX) should do something to
> support it.

Thanks.

If I got you correctly, FLUSH and Atomic Write is a new feature. And 
from the test result, it is not supported by MLX driver currently.

Wait for MLX Engineer for updates about FLUSH and Atomic Write.

IMO, it had better make rxe successfully connect to one physical ib 
device with FLUSH and Atomic Write, such as MLX or others.

Zhu Yanjun