netdev - Re: [net-next 09/14] ptp: mlx5: convert to .adjfine and adjust_by_scaled

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Message-ID: <2d5daf18-f300-6c90-0220-f624afb5a030@nvidia.com>
Date:   Thu, 25 Aug 2022 09:31:51 +0300
From:   Gal Pressman <gal@...dia.com>
To:     Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Siva Reddy Kallam <siva.kallam@...adcom.com>,
        Prashant Sreedharan <prashant@...adcom.com>,
        Michael Chan <mchan@...adcom.com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Vivek Thampi <vithampi@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Jie Wang <wangjie125@...wei.com>,
        Guangbin Huang <huangguangbin2@...wei.com>,
        Eran Ben Elisha <eranbe@...dia.com>,
        Aya Levin <ayal@...dia.com>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Wan Jiabing <wanjiabing@...o.com>,
        Lv Ruyi <lv.ruyi@....com.cn>, Arnd Bergmann <arnd@...db.de>,
        Shirly Ohnona <shirlyo@...dia.com>
Subject: Re: [net-next 09/14] ptp: mlx5: convert to .adjfine and
 adjust_by_scaled_ppm

On 23/08/2022 18:30, Gal Pressman wrote:
> On 19/08/2022 01:27, Jacob Keller wrote:
>> The mlx5 implementation of .adjfreq is implemented in terms of a
>> straight forward "base * ppb / 1 billion" calculation.
>>
>> Convert this to the .adjfine interface and use adjust_by_scaled_ppm for the
>> calculation  of the new mult value.
>>
>> Note that the mlx5_ptp_adjfreq_real_time function expects input in terms of
>> ppb, so use the scaled_ppm_to_ppb to convert before passing to this
>> function.
>>
>> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
>> Cc: Saeed Mahameed <saeedm@...dia.com>
>> Cc: Leon Romanovsky <leon@...nel.org>
>> Cc: Aya Levin <ayal@...dia.com>
>> ---
>>
>> I do not have this hardware, and have only compile tested the change.
>>
>>  .../ethernet/mellanox/mlx5/core/lib/clock.c   | 22 +++++--------------
>>  1 file changed, 6 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
>> index 91e806c1aa21..34871ab659d9 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
>> @@ -330,35 +330,25 @@ static int mlx5_ptp_adjfreq_real_time(struct mlx5_core_dev *mdev, s32 freq)
>>  	return mlx5_set_mtutc(mdev, in, sizeof(in));
>>  }
>>  
>> -static int mlx5_ptp_adjfreq(struct ptp_clock_info *ptp, s32 delta)
>> +static int mlx5_ptp_adjfine(struct ptp_clock_info *ptp, long delta)
> Small nit, please rename delta to scaled_ppm.
> I'll try to get this tested in our regression soon.

Tested-by: Shirly Ohnona <shirlyo@...dia.com>