From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Fri, 19 May 2017 17:52:35 +0200
Subject: net: define receive timestamp filter for NTP
Patch-mainline: v4.13-rc1
Git-commit: b8210a9e4bea6354eccc5d8a50ecc21ea7486dc9
References: bsc#1056664 FATE#322185 bsc#1056787

Add HWTSTAMP_FILTER_NTP_ALL to the hwtstamp_rx_filters enum for
timestamping of NTP packets. There is currently only one driver
(phyter) that could support it directly.

CC: Richard Cochran <richardcochran@gmail.com>
CC: Willem de Bruijn <willemb@google.com>
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Benjamin Poirier <bpoirier@suse.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/uapi/linux/net_tstamp.h |    3 +++
 net/core/dev_ioctl.c            |    2 ++
 2 files changed, 5 insertions(+)

--- a/include/uapi/linux/net_tstamp.h
+++ b/include/uapi/linux/net_tstamp.h
@@ -125,6 +125,9 @@ enum hwtstamp_rx_filters {
 	HWTSTAMP_FILTER_PTP_V2_SYNC,
 	/* PTP v2/802.AS1, any layer, Delay_req packet */
 	HWTSTAMP_FILTER_PTP_V2_DELAY_REQ,
+
+	/* NTP, UDP, all versions and packet modes */
+	HWTSTAMP_FILTER_NTP_ALL,
 };
 
 #endif /* _NET_TIMESTAMPING_H */
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -228,6 +228,8 @@ static int net_hwtstamp_validate(struct
 	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 		rx_filter_valid = 1;
 		break;
+	case HWTSTAMP_FILTER_NTP_ALL:
+		break;
 	}
 
 	if (!tx_type_valid || !rx_filter_valid)