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

[lizhijian@xxxxxxxxxxx]

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.