linux-kernel - Re: [PATCH for-next 4/6] RDMA/hns: Support flexible pagesize

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Message-ID: <20231226085202.GA13350@unreal>
Date: Tue, 26 Dec 2023 10:52:02 +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 4/6] RDMA/hns: Support flexible pagesize

On Mon, Dec 25, 2023 at 03:53:28PM +0800, Junxian Huang wrote:
> From: Chengchang Tang <tangchengchang@...wei.com>
> 
> In the current implementation, a fixed page size is used to
> configure the PBL, which is not flexible enough and is not
> conducive to the performance of the HW.
> 
> Signed-off-by: Chengchang Tang <tangchengchang@...wei.com>
> Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
> ---
>  drivers/infiniband/hw/hns/hns_roce_alloc.c  |   6 -
>  drivers/infiniband/hw/hns/hns_roce_device.h |   9 ++
>  drivers/infiniband/hw/hns/hns_roce_mr.c     | 168 +++++++++++++++-----
>  3 files changed, 139 insertions(+), 44 deletions(-)

I'm wonder if the ib_umem_find_best_pgsz() API should be used instead.
What is missing there?

Thanks