[PATCH 17/44] Use hardware timestamps to report packet timestamps for SO_TIMESTAMP and other similar socket options.

[Sebastian Huber]

From: kib <kib@FreeBSD.org>

Provide new control message SCM_TIME_INFO to supply information about
timestamp.  Currently it indicates that the timestamp was
hardware-assisted and high-precision, for software timestamps the
message is not returned.  Reserved fields are added to ABI to report
additional info about it, it is expected that raw hardware clock value
might be useful for some applications.

Reviewed by:	gallatin (previous version), hselasky
Sponsored by:	Mellanox Technologies
MFC after:	2 weeks
X-Differential revision:	https://reviews.freebsd.org/D12638
---
 newlib/libc/sys/rtems/include/sys/socket.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/newlib/libc/sys/rtems/include/sys/socket.h b/newlib/libc/sys/rtems/include/sys/socket.h
index 87d0f33e6..7c42eb5ce 100644
--- a/newlib/libc/sys/rtems/include/sys/socket.h
+++ b/newlib/libc/sys/rtems/include/sys/socket.h
@@ -563,6 +563,17 @@ struct sockcred {
 #define	SCM_BINTIME	0x04		/* timestamp (struct bintime) */
 #define	SCM_REALTIME	0x05		/* timestamp (struct timespec) */
 #define	SCM_MONOTONIC	0x06		/* timestamp (struct timespec) */
+#define	SCM_TIME_INFO	0x07		/* timestamp info */
+
+struct sock_timestamp_info {
+	__uint32_t	st_info_flags;
+	__uint32_t	st_info_pad0;
+	__uint64_t	st_info_rsv[7];
+};
+
+#define	ST_INFO_HW		0x0001		/* SCM_TIMESTAMP was hw */
+#define	ST_INFO_HW_HPREC	0x0002		/* SCM_TIMESTAMP was hw-assisted
+						   on entrance */
 #endif
 
 #if __BSD_VISIBLE
-- 
2.13.7