Subject: Re: [PATCH v5 net-next 3/3] selftests:net: Implement ptp4l sync test using netdevsim

From: Jakub Kicinski <[email-masked]>
Date: Tue, 5 May 2026 17:22:34 -0700

On Tue, 5 May 2026 09:36:30 +0200 Maciek Machnikowski wrote:
> On 04/05/2026 19:07, Jakub Kicinski wrote:
> > On Sun,  3 May 2026 09:47:47 +0200 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.
> >>
> >> This implementation runs the test runs over IPv4 link.  
> > 
> > Doesn't seem to pass on netdevsim for us:
> > 
> > # 41.13 [+40.95] # ptp4l follower did not reach locked state (s2) within 40s
> > # 41.13 [+0.00] # Follower log (last 10 lines): ptp4l[2179.605]: ioctl SIOCETHTOOL failed: Operation not supported | ptp4l[2179.607]: interface 'eth0' does not support requested timestamping mode | failed to create a clock
> > # 41.15 [+0.02] # Check| At /srv/vmksft/testing/wt-2/tools/testing/selftests/net/./ptp.py, line 173, in ptp_sync_test:
> > # 41.15 [+0.01] # Check|     _run_ptp4l_wait_sync(nsimsv.ifname, nsimcl.ifname, nssv.name, nscl.name)
> > # 41.16 [+0.01] # Check| At /srv/vmksft/testing/wt-2/tools/testing/selftests/net/./ptp.py, line 99, in _run_ptp4l_wait_sync:
> > # 41.17 [+0.01] # Check|     ksft_true(False, "PTP sync timeout")
> > # 41.17 [+0.00] # Check failed False does not eval to True PTP sync timeout
> > # 41.32 [+0.16] not ok 1 ptp.ptp_sync_test
> > # 41.33 [+0.00] # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> > 
> > Anything we need to do?  
> 
> Can you share the config file you used? Seems the PTP clock was not
> found which may lead to PTP_1588_CLOCK_MOCK not being enabled?

You have to add it to the relevant config.

Please read: github.com/linux-netdev/nipa/wiki/Netdev-CI-system