Add an option to use rfc6675 based pipe/inflight bytes calculation in newreno.

MFC after:	    3 weeks
Sponsored by:	    Limelight Networks

1 files changed, 10 insertions, 4 deletions

diff --git a/sys/netinet/cc/cc_newreno.c b/sys/netinet/cc/cc_newreno.c
index 96d64fe..31b70cc 100644
--- a/sys/netinet/cc/cc_newreno.c
+++ b/sys/netinet/cc/cc_newreno.c
@@ -214,6 +214,9 @@ newreno_cong_signal(struct cc_var *ccv, uint32_t type)
 static void
 newreno_post_recovery(struct cc_var *ccv)
 {
+	int pipe;
+	pipe = 0;
+
 	if (IN_FASTRECOVERY(CCV(ccv, t_flags))) {
 		/*
 		 * Fast recovery will conclude after returning from this
@@ -224,10 +227,13 @@ newreno_post_recovery(struct cc_var *ccv)
 		 *
 		 * XXXLAS: Find a way to do this without needing curack
 		 */
-		if (SEQ_GT(ccv->curack + CCV(ccv, snd_ssthresh),
-		    CCV(ccv, snd_max)))
-			CCV(ccv, snd_cwnd) = CCV(ccv, snd_max) -
-			ccv->curack + CCV(ccv, t_maxseg);
+		if (V_tcp_do_rfc6675_pipe)
+			pipe = tcp_compute_pipe(ccv->ccvc.tcp);
+		else
+			pipe = CCV(ccv, snd_max) - ccv->curack;
+
+		if (pipe < CCV(ccv, snd_ssthresh))
+			CCV(ccv, snd_cwnd) = pipe + CCV(ccv, t_maxseg);
 		else
 			CCV(ccv, snd_cwnd) = CCV(ccv, snd_ssthresh);
 	}