Commit 3ce23fa9 authored Sep 20, 2011 by Richard Cochran Committed by David S. Miller Sep 26, 2011

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>

parent 49b3fd4a

include/linux/net_tstamp.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -60,6 +60,15 @@ enum {
		* 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 */