git: 705d06b289e9 - main - rack: unbreak TCP fast open for the client side

[Michael Tuexen]

The branch main has been updated by tuexen:

URL: https://cgit.FreeBSD.org/src/commit/?id=705d06b289e9821439b7b694d766cad75bc064e5

commit 705d06b289e9821439b7b694d766cad75bc064e5
Author:     Michael Tuexen <tuexen at FreeBSD.org>
AuthorDate: 2021-03-05 14:57:26 +0000
Commit:     Michael Tuexen <tuexen at FreeBSD.org>
CommitDate: 2021-03-05 15:03:03 +0000

    rack: unbreak TCP fast open for the client side
    
    Allow sending user data on the SYN segment.
    
    Reviewed by:            rrs
    MFC after:              3 days
    Differential Revision:  https://reviews.freebsd.org/D29082
    Sponsored by:           Netflix, Inc.
---
 sys/netinet/tcp_stacks/rack.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/netinet/tcp_stacks/rack.c b/sys/netinet/tcp_stacks/rack.c
index 98a6f0f2e924..f5b0de7cbc59 100644
--- a/sys/netinet/tcp_stacks/rack.c
+++ b/sys/netinet/tcp_stacks/rack.c
@@ -12297,7 +12297,8 @@ again:
 	 * If sack_rxmit is true we are retransmitting from the scoreboard
 	 * in which case len is already set.
 	 */
-	if ((sack_rxmit == 0) && TCPS_HAVEESTABLISHED(tp->t_state)) {
+	if ((sack_rxmit == 0) &&
+	    (TCPS_HAVEESTABLISHED(tp->t_state) || IS_FASTOPEN(tp->t_flags))) {
 		uint32_t avail;
 
 		avail = sbavail(sb);