From 3ce23fa9780b70525932c5e4b5ac401c67390fae Mon Sep 17 00:00:00 2001 From: Richard Cochran Date: Tue, 20 Sep 2011 01:43:15 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- include/linux/net_tstamp.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/net_tstamp.h b/include/linux/net_tstamp.h index a3b8546354ac..3df0984cd0d5 100644 --- a/include/linux/net_tstamp.h +++ b/include/linux/net_tstamp.h @@ -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 */ -- 2.20.1