[Qemu-devel] [PULL 6/9] slirp: Send window updates to guest after window was closed

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

From: James Clarke <jrtc27@jrtc27.com>

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 <jrtc27@jrtc27.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
---
 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
-                     */
                 }
 
                 /*
-- 
2.17.0