From: Richard Cochran Date: Tue, 20 Sep 2011 01:43:15 +0000 (+0000) Subject: net: introduce ptp one step time stamp mode for sync packets X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=3ce23fa9780b70525932c5e4b5ac401c67390fae;p=deliverable%2Flinux.git 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 --- 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 */