netdev - Re: [PATCH net-next 3/3] bnxt_en: Add a non-real time mode to access NIC clock

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Message-ID: <Y2i5HrY31PSMb/xC@unreal>
Date:   Mon, 7 Nov 2022 09:51:58 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Michael Chan <michael.chan@...adcom.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org,
        edumazet@...gle.com, pabeni@...hat.com, gospo@...adcom.com,
        pavan.chebbi@...adcom.com
Subject: Re: [PATCH net-next 3/3] bnxt_en: Add a non-real time mode to access
 NIC clock

On Sun, Nov 06, 2022 at 07:16:32PM -0500, Michael Chan wrote:
> From: Pavan Chebbi <pavan.chebbi@...adcom.com>
> 
> When using a PHC that is shared between multiple hosts,
> in order to achieve consistent timestamps across all hosts,
> we need to isolate the PHC from any host making frequency
> adjustments.
> 
> This patch adds a non-real time mode for this purpose.
> The implementation is based on a free running NIC hardware timer
> which is used as the timestamper time-base. Each host implements
> individual adjustments to a local timecounter based on the NIC free
> running timer.
> 
> Cc: Richard Cochran <richardcochran@...il.com>
> Signed-off-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
> Reviewed-by: Andy Gospodarek <andrew.gospodarek@...adcom.com>
> Signed-off-by: Michael Chan <michael.chan@...adcom.com>
> ---
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c     |  5 ++-
>  drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 45 ++++++++++++++-----
>  drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h |  7 ++-
>  3 files changed, 42 insertions(+), 15 deletions(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>