linux-kernel - Re: [PATCH v2] RDMA/rtrs: client: Fix clt_path::max_pages_per

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Message-ID: <20251225123332.GI11869@unreal>
Date: Thu, 25 Dec 2025 14:33:32 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Honggang LI <honggangli@....com>
Cc: haris.iqbal@...os.com, jinpu.wang@...os.com, jgg@...pe.ca,
	danil.kipnis@...ud.ionos.com, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] RDMA/rtrs: client: Fix clt_path::max_pages_per_mr
 calculation

On Wed, Dec 24, 2025 at 05:50:30PM +0800, Honggang LI wrote:
> If device max_mr_size bits in the range [mr_page_shift+31:mr_page_shift]
> are zero, the `min3` function will set clt_path::max_pages_per_mr to
> zero.
> 
> `alloc_path_reqs` will pass zero, which is invalid, as the third parameter
> to `ib_alloc_mr`.
> 
> v1 -> v2:
> Correct the commit message and set max_pages_per_mr to U32_MAX
> as Michael Gur suggested.

Please put changelog under --- marker, below Signed-off-by tags.

> Fixes: 6a98d71daea1 ("RDMA/rtrs: client: main functionality")
> Signed-off-by: Honggang LI <honggangli@....com>
> ---
>  drivers/infiniband/ulp/rtrs/rtrs-clt.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
> index 71387811b281..e477d2c0ff35 100644
> --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
> +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
> @@ -1464,6 +1464,8 @@ static void query_fast_reg_mode(struct rtrs_clt_path *clt_path)
>  	mr_page_shift      = max(12, ffs(ib_dev->attrs.page_size_cap) - 1);
>  	max_pages_per_mr   = ib_dev->attrs.max_mr_size;
>  	do_div(max_pages_per_mr, (1ull << mr_page_shift));
> +	if ((u32)max_pages_per_mr == 0)
> +		max_pages_per_mr = U32_MAX;

It is "max_pages_per_mr = min_not_zero((u32)max_pages_per_mr, U32_MAX)"

Thanks

>  	clt_path->max_pages_per_mr =
>  		min3(clt_path->max_pages_per_mr, (u32)max_pages_per_mr,
>  		     ib_dev->attrs.max_fast_reg_page_list_len);
> -- 
> 2.52.0
>