net: introduce ptp one step time stamp mode for sync packets
The IEEE 1588 standard (PTP) has a provision for a "one step" mode, where
time stamps on outgoing event packets are inserted into the packet by the
hardware on the fly. This patch adds a new flag for the SIOCSHWTSTAMP
ioctl that lets user space programs request this mode.
Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/net_tstamp.h b/include/linux/net_tstamp.h
index a3b8546..3df0984 100644
--- a/include/linux/net_tstamp.h
+++ b/include/linux/net_tstamp.h
@@ -60,6 +60,15 @@
* before sending the packet.
*/
HWTSTAMP_TX_ON,
+
+ /*
+ * Enables time stamping for outgoing packets just as
+ * HWTSTAMP_TX_ON does, but also enables time stamp insertion
+ * directly into Sync packets. In this case, transmitted Sync
+ * packets will not received a time stamp via the socket error
+ * queue.
+ */
+ HWTSTAMP_TX_ONESTEP_SYNC,
};
/* possible values for hwtstamp_config->rx_filter */