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ptp: Request cycles for TX timestamp 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/skbuff.h
View File

@ -615,6 +615,9 @@ enum {
/* device driver is going to provide hardware time stamp */
SKBTX_IN_PROGRESS = 1 << 2,
/* generate hardware time stamp based on cycles if supported */
SKBTX_HW_TSTAMP_USE_CYCLES = 1 << 3,
/* generate wifi status information (where possible) */
SKBTX_WIFI_STATUS = 1 << 4,
@ -624,7 +627,9 @@ enum {
#define SKBTX_ANY_SW_TSTAMP (SKBTX_SW_TSTAMP | \
SKBTX_SCHED_TSTAMP)
#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)
#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | \
SKBTX_HW_TSTAMP_USE_CYCLES | \
SKBTX_ANY_SW_TSTAMP)
/* Definitions for flags in struct skb_shared_info */
enum {

11
net/socket.c
View File

@ -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;