ptp: Pass hwtstamp to ptp_convert_timestamp()

ptp_convert_timestamp() converts only the timestamp hwtstamp, which is
a field of the argument with the type struct skb_shared_hwtstamps *. So
a pointer to the hwtstamp field of this structure is sufficient.

Rework ptp_convert_timestamp() to use an argument of type ktime_t *.
This allows to add additional timestamp manipulation stages before the
call of ptp_convert_timestamp().
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/ptp/ptp_vclock.c

@@ -232,8 +232,7 @@ int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
 }
 EXPORT_SYMBOL(ptp_get_vclocks_index);
 
-ktime_t ptp_convert_timestamp(const struct skb_shared_hwtstamps *hwtstamps,
-			      int vclock_index)
+ktime_t ptp_convert_timestamp(const ktime_t *hwtstamp, int vclock_index)
 {
 	char name[PTP_CLOCK_NAME_LEN] = "";
 	struct ptp_vclock *vclock;
@@ -255,7 +254,7 @@ ktime_t ptp_convert_timestamp(const struct skb_shared_hwtstamps *hwtstamps,
 
 	vclock = info_to_vclock(ptp->info);
 
-	ns = ktime_to_ns(hwtstamps->hwtstamp);
+	ns = ktime_to_ns(*hwtstamp);
 
 	spin_lock_irqsave(&vclock->lock, flags);
 	ns = timecounter_cyc2time(&vclock->tc, ns);

include/linux/ptp_clock_kernel.h

@@ -384,17 +384,16 @@ int ptp_get_vclocks_index(int pclock_index, int **vclock_index);
 /**
  * ptp_convert_timestamp() - convert timestamp to a ptp vclock time
  *
- * @hwtstamps:    skb_shared_hwtstamps structure pointer
+ * @hwtstamp:     timestamp
  * @vclock_index: phc index of ptp vclock.
  *
  * Returns converted timestamp, or 0 on error.
  */
-ktime_t ptp_convert_timestamp(const struct skb_shared_hwtstamps *hwtstamps,
-			      int vclock_index);
+ktime_t ptp_convert_timestamp(const ktime_t *hwtstamp, int vclock_index);
 #else
 static inline int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
 { return 0; }
-static inline ktime_t ptp_convert_timestamp(const struct skb_shared_hwtstamps *hwtstamps,
+static inline ktime_t ptp_convert_timestamp(const ktime_t *hwtstamp,
 					    int vclock_index)
 { return 0; }
 

net/socket.c

@@ -888,7 +888,7 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
 	    (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
 	    !skb_is_swtx_tstamp(skb, false_tstamp)) {
 		if (sk->sk_tsflags & SOF_TIMESTAMPING_BIND_PHC)
-			hwtstamp = ptp_convert_timestamp(shhwtstamps,
+			hwtstamp = ptp_convert_timestamp(&shhwtstamps->hwtstamp,
 							 sk->sk_bind_phc);
 		else
 			hwtstamp = shhwtstamps->hwtstamp;