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

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Date: Mon, 11 Mar 2024 10:00:51 +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 2024/3/10 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?

And it would be helpful if you could give us a hint about any other
proper ways to do the algorithm parameter configuration.

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