Adds minimum RTT probing.

tcp_roccet.h

@@ -8,24 +8,15 @@
 #include <linux/math64.h>
 
 struct ack_rate {
-	u16 last_rate;	/* Last ACK-rate */
+	u32 last_rate;	/* Last ACK-rate */
 	u32 last_rate_time;	/* Timestamp of the last ACK-rate */
-	u16 curr_rate;	/* Current ACK-rate */
-	u16 cnt;	/* Used for counting acks */
+	u32 curr_rate;	/* Current ACK-rate */
+	u32 cnt;	/* Used for counting acks */
 };
 
-struct bandwidth_limit_detect {
-	u32 sum_cwnd;	/* sum of cwnd during time interval */
-	u32 sum_acked;	/* sum of received acks during time interval */
-	u32 next_check;	/* end/upper bound of time interval */
-};
-
-struct timed_rtt {
-	u32 time;	/* Time of recording */
-	u32 rtt;	/* Measured RTT */
-};
-
-/* Based on the BICTCP struct with additions specific for the ROCCET-Algorithm */
+/* Based on the BICTCP struct with additions specific
+ * for the ROCCET-Algorithm
+ */
 struct roccettcp {
 	u32 cnt;		/* increase cwnd by 1 after ACKs */
 	u32 last_max_cwnd;	/* last maximum snd_cwnd */
@@ -41,15 +32,17 @@ struct roccettcp {
 	u32 tcp_cwnd;		/* estimated tcp cwnd */
 	u32 curr_rtt;		/* the minimum rtt of current round */
 
-	u32 roccet_last_event_time_us;	/* The last time ROCCET was triggered */
+	u32 roccet_last_event_time_us;	/* The last time ROCCET was
+					 * triggered
+					 */
 	bool ece_received;	/* Set to true if an ECE bit was received */
-	u32 curr_min_rtt;		/* The current observed minRTT */
-	struct timed_rtt curr_min_rtt_timed;	/* The current observed minRTT with
-						 * the timestamp when it was observed
-						 */
-	u32 curr_srrtt;			/* The srRTT calculated based on the latest ACK */
+	u32 curr_min_rtt;	/* The current observed minRTT */
+	u32 next_min_rtt_probe; /* Next time to probe the minRTT */
+	u32 probe_min_rtt_until;	/* End of minRTT probing period */
+	u32 cwnd_before_min_rtt_probe; /* cwnd before min RTT probeing */
+	u32 curr_srrtt;		/* srRTT calculated based on the latest ACK */
+	u32 next_srrtt_check;	/* Next check for srRTT */
 	struct ack_rate ack_rate;	/* The last and the current ACK rate */
-	struct bandwidth_limit_detect bw_limit;
 	u32 last_rtt;			/* Used for jitter calculation */
 };