linux-kernel - Re: [PATCH v2 net] net: stmmac: retain PTP clock time during SIOCSHWTSTAMP ioctls

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Message-Id: <163759200916.2046.16368068009111419388.git-patchwork-notify@kernel.org>
Date:   Mon, 22 Nov 2021 14:40:09 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, peppe.cavallaro@...com,
        alexandre.torgue@...s.st.com, joabreu@...opsys.com,
        davem@...emloft.net, kuba@...nel.org, mcoquelin.stm32@...il.com,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        xiaoliang.yang_1@....com, yannick.vignon@....com,
        m.olbrich@...gutronix.de, a.fatoum@...gutronix.de,
        h.assmann@...gutronix.de, kernel@...gutronix.de,
        kurt@...utronix.de, richardcochran@...il.com
Subject: Re: [PATCH v2 net] net: stmmac: retain PTP clock time during
 SIOCSHWTSTAMP ioctls

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@...emloft.net>:

On Sun, 21 Nov 2021 19:57:04 +0200 you wrote:
> From: Holger Assmann <h.assmann@...gutronix.de>
> 
> Currently, when user space emits SIOCSHWTSTAMP ioctl calls such as
> enabling/disabling timestamping or changing filter settings, the driver
> reads the current CLOCK_REALTIME value and programming this into the
> NIC's hardware clock. This might be necessary during system
> initialization, but at runtime, when the PTP clock has already been
> synchronized to a grandmaster, a reset of the timestamp settings might
> result in a clock jump. Furthermore, if the clock is also controlled by
> phc2sys in automatic mode (where the UTC offset is queried from ptp4l),
> that UTC-to-TAI offset (currently 37 seconds in 2021) would be
> temporarily reset to 0, and it would take a long time for phc2sys to
> readjust so that CLOCK_REALTIME and the PHC are apart by 37 seconds
> again.
> 
> [...]

Here is the summary with links:
  - [v2,net] net: stmmac: retain PTP clock time during SIOCSHWTSTAMP ioctls
    https://git.kernel.org/netdev/net/c/a6da2bbb0005

You are awesome, thank you!
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