linux-kernel - Re: [PATCH for-next] RDMA/hns: Support congestion control algorithm parameter configuration

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Date: Mon, 11 Mar 2024 22:00:27 +0800
From: Junxian Huang <huangjunxian6@...ilicon.com>
To: Leon Romanovsky <leon@...nel.org>
CC: <jgg@...pe.ca>, <linux-rdma@...r.kernel.org>, <linuxarm@...wei.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH for-next] RDMA/hns: Support congestion control algorithm
 parameter configuration



On 2024/3/11 15:11, Leon Romanovsky wrote:
> On Mon, Mar 11, 2024 at 10:00:51AM +0800, Junxian Huang wrote:
>>
>>
>> On 2024/3/10 18:00, Leon Romanovsky wrote:
>>> On Fri, Mar 08, 2024 at 06:54:43PM +0800, Junxian Huang wrote:
>>>> From: Chengchang Tang <tangchengchang@...wei.com>
>>>>
>>>> hns RoCE supports 4 congestion control algorithms. Each algorihm
>>>> involves multiple parameters. Add port sysfs directory for each
>>>> algorithm to allow modifying their parameters.
>>>
>>> Unless Jason changed his position after this rewrite [1], we don't allow
>>> any custom driver sysfs code.
>>>
>>> [1] https://lore.kernel.org/all/cover.1623427137.git.leonro@nvidia.com/
>>>
>>
>> I didn't quite get the reason from [1], could you please explain it?
> 
> Before [1], we didn't allow custom sysfs. After [1], the sysfs code
> started to be more sane and usable for the drivers. However, it is
> unlikely that the policy is changed to allow driver sysfs code.
> 
>>
>> And it would be helpful if you could give us a hint about any other
>> proper ways to do the algorithm parameter configuration.
> 
> Like any other FW internals.
> 

If we add the capability of custom driver parameter configuration to
rdmatool (similar to [2]), would it be acceptable?

[2] https://patchwork.ozlabs.org/project/netdev/patch/1530703837-24563-4-git-send-email-moshe@mellanox.com/

Junxian

> Thanks
> 
>>
>> Thanks,
>> Junxian
>>
>>>>
>>>> Signed-off-by: Chengchang Tang <tangchengchang@...wei.com>
>>>> Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
>>>> ---
>>>>  drivers/infiniband/hw/hns/Makefile          |   2 +-
>>>>  drivers/infiniband/hw/hns/hns_roce_device.h |  20 ++
>>>>  drivers/infiniband/hw/hns/hns_roce_hw_v2.c  |  59 ++++
>>>>  drivers/infiniband/hw/hns/hns_roce_hw_v2.h  | 132 ++++++++
>>>>  drivers/infiniband/hw/hns/hns_roce_main.c   |   3 +
>>>>  drivers/infiniband/hw/hns/hns_roce_sysfs.c  | 346 ++++++++++++++++++++
>>>>  6 files changed, 561 insertions(+), 1 deletion(-)
>>>>  create mode 100644 drivers/infiniband/hw/hns/hns_roce_sysfs.c
>>>
>>> Thanks
>>