git: 05e742af6f54 - stable/13 - calculate prr_out correctly when pipe < ssthresh

[Richard Scheffenegger]

The branch stable/13 has been updated by rscheff:

URL: https://cgit.FreeBSD.org/src/commit/?id=05e742af6f548364909ed671f0b3774e54dc77d1

commit 05e742af6f548364909ed671f0b3774e54dc77d1
Author:     Richard Scheffenegger <rscheff at FreeBSD.org>
AuthorDate: 2021-03-01 15:25:46 +0000
Commit:     Richard Scheffenegger <rscheff at FreeBSD.org>
CommitDate: 2021-03-04 08:13:51 +0000

    calculate prr_out correctly when pipe < ssthresh
    
    Reviewed By:    #transport, tuexen
    MFC after:      3 days
    Sponsored by:   NetApp, Inc.
    Differential Revision:  https://reviews.freebsd.org/D28998
    
    (cherry picked from commit 0b0f8b359d0b94b09cfec35e5d5de01b23c7fbf1)
---
 sys/netinet/tcp_input.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
index f7ef3ed81da2..0cb99ce8f2c5 100644
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -2606,10 +2606,12 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
 						} else {
 							if (V_tcp_do_prr_conservative)
 								limit = tp->sackhint.prr_delivered -
-									tp->sackhint.sack_bytes_rexmit;
+									(tp->sackhint.sack_bytes_rexmit +
+									(tp->snd_nxt - tp->snd_recover));
 							else
 								limit = imax(tp->sackhint.prr_delivered -
-									    tp->sackhint.sack_bytes_rexmit,
+									    (tp->sackhint.sack_bytes_rexmit +
+									    (tp->snd_nxt - tp->snd_recover)),
 									    del_data) + maxseg;
 							snd_cnt = imin(tp->snd_ssthresh - pipe, limit);
 						}
@@ -3982,10 +3984,12 @@ tcp_prr_partialack(struct tcpcb *tp, struct tcphdr *th)
 	} else {
 		if (V_tcp_do_prr_conservative)
 			limit = tp->sackhint.prr_delivered -
-			    tp->sackhint.sack_bytes_rexmit;
+			    (tp->sackhint.sack_bytes_rexmit +
+			    (tp->snd_nxt - tp->snd_recover));
 		else
 			limit = imax(tp->sackhint.prr_delivered -
-				    tp->sackhint.sack_bytes_rexmit,
+				    (tp->sackhint.sack_bytes_rexmit +
+				    (tp->snd_nxt - tp->snd_recover)),
 				    del_data) + maxseg;
 		snd_cnt = imin((tp->snd_ssthresh - pipe), limit);
 	}