ptp: Support late timestamp determination

If a physical clock supports a free running cycle counter, then
timestamps shall be based on this time too. For TX it is known in
advance before the transmission if a timestamp based on the free running
cycle counter is needed. For RX it is impossible to know which timestamp
is needed before the packet is received and assigned to a socket.

Support late timestamp determination by a network device. Therefore, an
address/cookie is stored within the new netdev_data field of struct
skb_shared_hwtstamps. This address/cookie is provided to a new network
device function called ndo_get_tstamp(), which returns a timestamp based
on the normal/adjustable time or based on the free running cycle
counter. If function is not supported, then timestamp handling is not
changed.

This mechanism is intended for RX, but TX use is also possible.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4a4f25975ca2..97de40bcfef6 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -588,8 +588,10 @@ static inline bool skb_frag_must_loop(struct page *p)
 
 /**
  * struct skb_shared_hwtstamps - hardware time stamps
- * @hwtstamp:	hardware time stamp transformed into duration
- *		since arbitrary point in time
+ * @hwtstamp:		hardware time stamp transformed into duration
+ *			since arbitrary point in time
+ * @netdev_data:	address/cookie of network device driver used as
+ *			reference to actual hardware time stamp
  *
  * Software time stamps generated by ktime_get_real() are stored in
  * skb->tstamp.
@@ -601,7 +603,10 @@ static inline bool skb_frag_must_loop(struct page *p)
  * &skb_shared_info. Use skb_hwtstamps() to get a pointer.
  */
 struct skb_shared_hwtstamps {
-	ktime_t	hwtstamp;
+	union {
+		ktime_t	hwtstamp;
+		void *netdev_data;
+	};
 };
 
 /* Definitions for tx_flags in struct skb_shared_info */
@@ -621,6 +626,9 @@ enum {
 	/* generate wifi status information (where possible) */
 	SKBTX_WIFI_STATUS = 1 << 4,
 
+	/* determine hardware time stamp based on time or cycles */
+	SKBTX_HW_TSTAMP_NETDEV = 1 << 5,
+
 	/* generate software time stamp when entering packet scheduling */
 	SKBTX_SCHED_TSTAMP = 1 << 6,
 };