summaryrefslogtreecommitdiff
path: root/net/socket.c
diff options
context:
space:
mode:
authorGerhard Engleder <gerhard@engleder-embedded.com>2022-05-06 22:01:38 +0200
committerPaolo Abeni <pabeni@redhat.com>2022-05-10 09:48:08 +0200
commit51eb7492af276b5b4d27cfa4474d40bdac7b9cf8 (patch)
treee0fff209136de8a5af800b4486a659f9bacb3b73 /net/socket.c
parent42704b26b0f1d891f6cf4ebc877dbac0d17c690d (diff)
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>
Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/net/socket.c b/net/socket.c
index f0c39c874665..5c1c5e6100e1 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -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;