git: 72ae93825244 - main - Add a comment to the new tcp_get_srtt method to clarify that ticks are kept in a shifted form and need to be un-shifted before use.

The branch main has been updated by rrs:

URL: https://cgit.FreeBSD.org/src/commit/?id=72ae938252446ce6c716cb51e3f27737b137900e

commit 72ae938252446ce6c716cb51e3f27737b137900e
Author:     Randall Stewart <rrs@FreeBSD.org>
AuthorDate: 2023-05-19 19:53:26 +0000
Commit:     Randall Stewart <rrs@FreeBSD.org>
CommitDate: 2023-05-19 19:53:26 +0000

    Add a comment to the new tcp_get_srtt method to clarify that ticks
    are kept in a shifted form and need to be un-shifted before use.
    
    Suggested by: rpokala@
---
 sys/netinet/tcp_subr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c
index db0b3b76088e..7e156bcd5355 100644
--- a/sys/netinet/tcp_subr.c
+++ b/sys/netinet/tcp_subr.c
@@ -4649,8 +4649,10 @@ tcp_get_srtt(struct tcpcb *tp, int granularity)
 
 	if (tp->t_tmr_granularity == TCP_TMR_GRANULARITY_USEC)
 		srtt = tp->t_srtt;
-	else if (tp->t_tmr_granularity == TCP_TMR_GRANULARITY_TICKS)
+	else if (tp->t_tmr_granularity == TCP_TMR_GRANULARITY_TICKS) {
+		/* TICKS are stored shifted; unshift for the real TICKS */
 		srtt = tp->t_srtt >> TCP_RTT_SHIFT;
+	}
 	if (tp->t_tmr_granularity == granularity)
 		return (srtt);
 	/* If we reach here they are oppsite what the caller wants */