net: mscc: ocelot: deny TX timestamping of non-PTP packets

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It appears that Ocelot switches cannot timestamp non-PTP frames,
I tested this using the isochron program at:
https://github.com/vladimiroltean/tsn-scripts

with the result that the driver increments the ocelot_port->ts_id
counter as expected, puts it in the REW_OP, but the hardware seems to
not timestamp these packets at all, since no IRQ is emitted.

Therefore check whether we are sending PTP frames, and refuse to
populate REW_OP otherwise.

Fixes: 4e3b0468e6 ("net: mscc: PTP Hardware Clock (PHC) support")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Vladimir Oltean 2021-10-12 14:40:38 +03:00 • committed by Jakub Kicinski

parent 9fde506e0c

commit fba01283d8

1 changed files with 12 additions and 7 deletions

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drivers/net/ethernet/mscc/ocelot.c

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