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net: introduce ptp one step time stamp mode for sync packets

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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>
This commit is contained in:
Richard Cochran 2011-09-20 01:43:15 +00:00 committed by David S. Miller
parent 49b3fd4aff
commit 3ce23fa978
1 changed files with 9 additions and 0 deletions
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9
include/linux/net_tstamp.h
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@ -60,6 +60,15 @@ enum {
* before sending the packet. * before sending the packet.
*/ */
HWTSTAMP_TX_ON, 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 */ /* possible values for hwtstamp_config->rx_filter */