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authorRichard Cochran <richardcochran@gmail.com>2011-09-20 05:43:15 +0400
committerDavid S. Miller <davem@davemloft.net>2011-09-27 00:02:46 +0400
commit3ce23fa9780b70525932c5e4b5ac401c67390fae (patch)
tree840592386fc253e74eaa6725a3ad2359f0ad2b72 /include/linux/net_tstamp.h
parent49b3fd4aff7ede794d4fe50b80095eb33cc9d911 (diff)
downloadlinux-3ce23fa9780b70525932c5e4b5ac401c67390fae.tar.xz
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>
Diffstat (limited to 'include/linux/net_tstamp.h')
-rw-r--r--include/linux/net_tstamp.h9
1 files changed, 9 insertions, 0 deletions
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 */