linux-kernel - Re: [net-next PATCH v4] octeontx2-pf: Use PTP HW timestamp counter atomic update feature

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Message-ID: <20230822072909.GM2711035@kernel.org>
Date:   Tue, 22 Aug 2023 09:29:09 +0200
From:   Simon Horman <horms@...nel.org>
To:     Sai Krishna <saikrishnag@...vell.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, sgoutham@...vell.com,
        gakula@...vell.com, sbhatta@...vell.com, hkelam@...vell.com,
        richardcochran@...il.com, kalesh-anakkur.purayil@...adcom.com,
        leon@...nel.org, Naveen Mamindlapalli <naveenm@...vell.com>
Subject: Re: [net-next PATCH v4] octeontx2-pf: Use PTP HW timestamp counter
 atomic update feature

On Mon, Aug 21, 2023 at 04:06:29PM +0530, Sai Krishna wrote:
> Some of the newer silicon versions in CN10K series supports a feature
> where in the current PTP timestamp in HW can be updated atomically
> without losing any cpu cycles unlike read/modify/write register.
> This patch uses this feature so that PTP accuracy can be improved
> while adjusting the master offset in HW. There is no need for SW
> timecounter when using this feature. So removed references to SW
> timecounter wherever appropriate.
> 
> Signed-off-by: Sai Krishna <saikrishnag@...vell.com>
> Signed-off-by: Naveen Mamindlapalli <naveenm@...vell.com>
> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@...adcom.com>
> ---
> v4:
>     - Addressed review comments given by Leon Romanovsky
>         1. Unlocked mutex in error conditions.
> v3:
>     - Addressed review comments given by Jakub Kicinski
>         1. Fixed re-ordering of headers in alphabetical order
>         2. Refactored SoC revision identification logic
>         3. CN10K errata revisions can be different from atomic update
>            supported revision devices.
>         4. Removed ptp device check.
> v2:
>     - Addressed review comments given by Simon Horman, Kalesh Anakkur Purayil
> 	1. Removed inline keyword for function in .c file
>         2. Modified/optimized conditions related boolean

Reviewed-by: Simon Horman <horms@...nel.org>