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

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Message-ID: <20240311071119.GH12921@unreal>
Date: Mon, 11 Mar 2024 09:11:19 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Junxian Huang <huangjunxian6@...ilicon.com>
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 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.

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
>