From b0060110aaaf3d2b7a0d2fc938e87848d188837c Mon Sep 17 00:00:00 2001 From: James Clarke Date: Tue, 17 Apr 2018 15:10:58 +0100 Subject: [PATCH] slirp: Send window updates to guest after window was closed If the receive window presented to the guest closes, slirp should send a window update once the window reopens sufficiently, rather than forcing the guest to send a window probe, which can take several seconds. Signed-off-by: James Clarke Signed-off-by: Samuel Thibault --- slirp/slirp.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/slirp/slirp.c b/slirp/slirp.c index 4f29753444..5c3bd6163f 100644 --- a/slirp/slirp.c +++ b/slirp/slirp.c @@ -678,13 +678,13 @@ void slirp_pollfds_poll(GArray *pollfds, int select_error) /* continue; */ } else { ret = sowrite(so); + if (ret > 0) { + /* Call tcp_output in case we need to send a window + * update to the guest, otherwise it will be stuck + * until it sends a window probe. */ + tcp_output(sototcpcb(so)); + } } - /* - * XXXXX If we wrote something (a lot), there - * could be a need for a window update. - * In the worst case, the remote will send - * a window probe to get things going again - */ } /*