rlc: add basic RLC AM reset test

lib/test/upper/rlc_am_test.cc

@@ -1056,6 +1056,60 @@ void resegment_test_6()
   }
 }
 
+void reset_test()
+{
+  srslte::log_filter log1("RLC_AM_1");
+  srslte::log_filter log2("RLC_AM_2");
+  log1.set_level(srslte::LOG_LEVEL_DEBUG);
+  log2.set_level(srslte::LOG_LEVEL_DEBUG);
+  log1.set_hex_limit(-1);
+  log2.set_hex_limit(-1);
+  rlc_am_tester     tester;
+  mac_dummy_timers  timers;
+
+  rlc_am rlc1;
+  int len;
+
+  log1.set_level(srslte::LOG_LEVEL_DEBUG);
+
+  rlc1.init(&log1, 1, &tester, &tester, &timers);
+
+  LIBLTE_RRC_RLC_CONFIG_STRUCT cnfg;
+  cnfg.rlc_mode = LIBLTE_RRC_RLC_MODE_AM;
+  cnfg.dl_am_rlc.t_reordering = LIBLTE_RRC_T_REORDERING_MS5;
+  cnfg.dl_am_rlc.t_status_prohibit = LIBLTE_RRC_T_STATUS_PROHIBIT_MS5;
+  cnfg.ul_am_rlc.max_retx_thresh = LIBLTE_RRC_MAX_RETX_THRESHOLD_T4;
+  cnfg.ul_am_rlc.poll_byte = LIBLTE_RRC_POLL_BYTE_KB25;
+  cnfg.ul_am_rlc.poll_pdu = LIBLTE_RRC_POLL_PDU_P4;
+  cnfg.ul_am_rlc.t_poll_retx = LIBLTE_RRC_T_POLL_RETRANSMIT_MS5;
+
+  rlc1.configure(&cnfg);
+
+  // Push 1 SDU of size 10 into RLC1
+  byte_buffer_t sdu_buf;
+  *sdu_buf.msg    = 1; // Write the index into the buffer
+  sdu_buf.N_bytes = 100;
+  rlc1.write_sdu(&sdu_buf);
+
+  // read 1 PDU from RLC1 and force segmentation
+  byte_buffer_t pdu_bufs;
+  len = rlc1.read_pdu(pdu_bufs.msg, 4);
+  pdu_bufs.N_bytes = len;
+
+  // reset RLC1
+  rlc1.reset();
+
+  // read another PDU segment from RLC1
+  len = rlc1.read_pdu(pdu_bufs.msg, 4);
+  pdu_bufs.N_bytes = len;
+
+  // now empty RLC buffer
+  len = rlc1.read_pdu(pdu_bufs.msg, 100);
+  pdu_bufs.N_bytes = len;
+
+  assert(0 == rlc1.get_buffer_state());
+}
+
 int main(int argc, char **argv) {
   basic_test();
   byte_buffer_pool::get_instance()->cleanup();
@@ -1086,4 +1140,7 @@ int main(int argc, char **argv) {
 
   resegment_test_6();
   byte_buffer_pool::get_instance()->cleanup();
+
+  reset_test();
+  byte_buffer_pool::get_instance()->cleanup();
 }