From bfb3155da681e5ac3bfffda38de6bbb55f6b820c Mon Sep 17 00:00:00 2001
From: Andre Puschmann <andre@softwareradiosystems.com>
Date: Wed, 7 Feb 2018 20:49:04 +0100
Subject: [PATCH] rlc_am: don't build new PDUs if tx window is full

---
 lib/src/upper/rlc_am.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/src/upper/rlc_am.cc b/lib/src/upper/rlc_am.cc
index 6fdf52966..c1129ff51 100644
--- a/lib/src/upper/rlc_am.cc
+++ b/lib/src/upper/rlc_am.cc
@@ -676,6 +676,12 @@ int  rlc_am::build_data_pdu(uint8_t *payload, uint32_t nof_bytes)
     return 0;
   }
 
+  // do not build any more PDU if window is already full
+  if (!tx_sdu && tx_window.size() >= RLC_AM_WINDOW_SIZE) {
+    log->info("Tx window full.\n");
+    return 0;
+  }
+
   byte_buffer_t *pdu = pool_allocate;
   if (!pdu) {
     log->console("Fatal Error: Could not allocate PDU in build_data_pdu()\n");