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ptp: Request cycles for TX timestamp

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The free running cycle counter of physical clocks called cycles shall be
used for hardware timestamps to enable synchronisation.

Introduce new flag SKBTX_HW_TSTAMP_USE_CYCLES, which signals driver to
provide a TX timestamp based on cycles if cycles are supported.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Gerhard Engleder
2022-05-06 22:01:38 +02:00
committed by Paolo Abeni
parent 42704b26b0
commit 51eb7492af
2 changed files with 16 additions and 2 deletions
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11
net/socket.c
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@@ -683,9 +683,18 @@ void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
{
u8 flags = *tx_flags;
if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) {
flags |= SKBTX_HW_TSTAMP;
/* PTP hardware clocks can provide a free running cycle counter
* as a time base for virtual clocks. Tell driver to use the
* free running cycle counter for timestamp if socket is bound
* to virtual clock.
*/
if (tsflags & SOF_TIMESTAMPING_BIND_PHC)
flags |= SKBTX_HW_TSTAMP_USE_CYCLES;
}
if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
flags |= SKBTX_SW_TSTAMP;