Subject: Re: [PATCH v3 net-next 3/3] selftests:net: Implement ptp4l sync test using netdevsim

From: Jakub Kicinski <[email-masked]>
Date: Wed, 25 Feb 2026 18:41:00 -0800

On Wed, 25 Feb 2026 16:38:58 +0100 Maciek Machnikowski wrote:
> Add PTP synchronization test using ptp4l and netdevsim.
> 
> The test creates two netdevsim adapters, links them together
> and runs the ptp4l leader and ptp4l follower on two ends
> of the netdevsim link and waits for the follower to report the
> synchronized state (s2) in its output log.

Please make this a Python test using the wrappers we have so that
the test can run both against netdevsim and real devices.

Is ptp4l going to be stable as a selftest? And will it give us solid
coverage (vs doing some fallbacks and pass even for broken drivers)?
We generally test 

Vadim, WDYT?