Add timestamp to netmap_slot

Author: kierank

LINUX/mlx5_netmap_linux.h

@@ -324,6 +324,8 @@ int mlx5e_netmap_txsync(struct netmap_kring *kring, int flags) {
 
       /* unpack slot number from skb pointer */
       nm_i_done = (u32)((uintptr_t)skb & 0x00FFFFFF);
+      slot->flags |= NS_TIMESTAMP;
+      slot->ts = mlx5_timecounter_cyc2time(sq->clock, get_cqe_ts(cqe));
 
       sqcc += num_wqebbs;
       kring->nr_hwtail = nm_prev(nm_i_done, lim);
@@ -491,6 +493,9 @@ int mlx5e_netmap_rxsync(struct netmap_kring *kring, int flags) {
 
     ring->slot[nm_i].len = bytes_recv;
     ring->slot[nm_i].flags = slot_flags;
+    ring->slot[nm_i].flags |= NS_TIMESTAMP;
+    ring->slot[nm_i].ts = mlx5_timecounter_cyc2time(rq->clock, get_cqe_ts(cqe));
+
     nm_i = nm_next(nm_i, lim);
 
   wq_cyc_pop:

sys/net/netmap.h

@@ -165,6 +165,7 @@ struct netmap_slot {
 	uint16_t len;		/* length for this slot */
 	uint16_t flags;		/* buf changed, etc. */
 	uint64_t ptr;		/* pointer for indirect buffers */
+	uint64_t ts;		/* timestamp of buffer */
 };
 
 /*
@@ -224,6 +225,12 @@ struct netmap_slot {
 	 * ring of the monitored port
 	 */
 
+#define NS_TIMESTAMP 0x0080
+	/* the packet has a receive or transmit timestamp
+	   Note: this is using the NIC hardware clock and
+	         not the PC clock
+	 */
+
 #define	NS_PORT_SHIFT	8
 #define	NS_PORT_MASK	(0xff << NS_PORT_SHIFT)
 	/*