Re: [RFC PATCH v4 net-next 1/4] tcp: replace cnt & rtt with struct in pkts_acked()

Replace 2 arguments (cnt and rtt) in the congestion control modules'
pkts_acked() function with a struct. This will allow adding more
information without having to modify existing congestion control
modules (tcp_nv in particular needs bytes in flight when packet
was sent).

 
+struct ack_sample {
+	u32 pkts_acked;
+	s32 rtt_us;
+};
+
 struct tcp_congestion_ops {
 	struct list_head	list;
 	u32 key;

@@ -857,7 +862,7 @@ struct tcp_congestion_ops {
 	/* new value of cwnd after loss (optional) */
 	u32  (*undo_cwnd)(struct sock *sk);
 	/* hook for packet ack accounting (optional) */
-	void (*pkts_acked)(struct sock *sk, u32 num_acked, s32 rtt_us);
+	void (*pkts_acked)(struct sock *sk, struct ack_sample *sample);