netdev - Re: [PATCH v8 net-next 5/5] net: ena: Add PHC documentation

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Message-ID: <aecb8d12-805b-4592-94f3-4dbfcdcd5cff@lunn.ch>
Date: Tue, 4 Mar 2025 22:10:06 +0100
From: Andrew Lunn <andrew@...n.ch>
To: David Arinzon <darinzon@...zon.com>
Cc: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	"Woodhouse, David" <dwmw@...zon.com>,
	"Machulsky, Zorik" <zorik@...zon.com>,
	"Matushevsky, Alexander" <matua@...zon.com>,
	Saeed Bshara <saeedb@...zon.com>, "Wilson, Matt" <msw@...zon.com>,
	"Liguori, Anthony" <aliguori@...zon.com>,
	"Bshara, Nafea" <nafea@...zon.com>,
	"Schmeilin, Evgeny" <evgenys@...zon.com>,
	"Belgazal, Netanel" <netanel@...zon.com>,
	"Saidi, Ali" <alisaidi@...zon.com>,
	"Herrenschmidt, Benjamin" <benh@...zon.com>,
	"Kiyanovski, Arthur" <akiyano@...zon.com>,
	"Dagan, Noam" <ndagan@...zon.com>,
	"Bernstein, Amit" <amitbern@...zon.com>,
	"Agroskin, Shay" <shayagr@...zon.com>,
	"Ostrovsky, Evgeny" <evostrov@...zon.com>,
	"Tabachnik, Ofir" <ofirt@...zon.com>,
	"Machnikowski, Maciek" <maciek@...hnikowski.net>,
	Rahul Rameshbabu <rrameshbabu@...dia.com>,
	Gal Pressman <gal@...dia.com>,
	Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Subject: Re: [PATCH v8 net-next 5/5] net: ena: Add PHC documentation

> +The feature is turned off by default, in order to turn the feature on,
> +please use the following:
> +
> +- sysfs (during runtime):
> +
> +.. code-block:: shell
> +
> +  echo 1 > /sys/bus/pci/devices/<domain:bus:slot.function>/phc_enable
> +
> +All available PTP clock sources can be tracked here:
> +
> +.. code-block:: shell
> +
> +  ls /sys/class/ptp
> +
> +PHC support and capabilities can be verified using ethtool:
> +
> +.. code-block:: shell
> +
> +  ethtool -T <interface>
> +
> +**PHC timestamp**
> +
> +To retrieve PHC timestamp, use `ptp-userspace-api`_, usage example using `testptp`_:
> +
> +.. code-block:: shell
> +
> +  testptp -d /dev/ptp$(ethtool -T <interface> | awk '/PTP Hardware Clock:/ {print $NF}') -k 1

Why is not opening /dev/ptpX sufficient to enable the PHC?

    Andrew