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

Jakub Kicinski
2026-05-04T17:07:54Z

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?