T-Rex: Add advanced stateful mode

- provide base routines to run T-Rex in advanced stateful mode

Change-Id: Ib0dc5f2919c370753335f6446860683dc4b12d93
Signed-off-by: Jan Gelety <jgelety@cisco.com>

1 files changed, 105 insertions, 0 deletions

diff --git a/GPL/tools/trex/trex_stl_stop.py b/GPL/tools/trex/trex_stl_stop.py
new file mode 100644
index 0000000000..28a9de9421
--- /dev/null
+++ b/GPL/tools/trex/trex_stl_stop.py
@@ -0,0 +1,105 @@
+#!/usr/bin/python3
+
+# Copyright (c) 2020 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""This script uses T-REX stateless API to drive t-rex instance.
+
+Requirements:
+- T-REX: https://github.com/cisco-system-traffic-generator/trex-core
+ - compiled and running T-REX process (eg. ./t-rex-64 -i)
+ - trex.stl.api library
+- Script must be executed on a node with T-REX instance
+
+Functionality:
+1. Stop any running traffic
+2. Optionally restore reference counter values.
+3. Return conter differences.
+"""
+
+import argparse
+import json
+import sys
+
+from collections import OrderedDict  # Needed to parse xstats representation.
+
+sys.path.insert(
+    0, u"/opt/trex-core-2.73/scripts/automation/trex_control_plane/interactive/"
+)
+from trex.stl.api import *
+
+
+def main():
+    """Stop traffic if any is running. Report xstats."""
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        u"--xstat0", type=str, default=u"",
+        help=u"Reference xstat object if any."
+    )
+    parser.add_argument(
+        u"--xstat1", type=str, default=u"",
+        help=u"Reference xstat object if any."
+    )
+    args = parser.parse_args()
+
+    client = STLClient()
+    try:
+        # connect to server
+        client.connect()
+
+        client.acquire(force=True)
+        # TODO: Support unidirection.
+        client.stop(ports=[0, 1])
+
+        # Read the stats after the test,
+        # we need to update values before the last trial started.
+        if args.xstat0:
+            snapshot = eval(args.xstat0)
+            client.ports[0].get_xstats().reference_stats = snapshot
+        if args.xstat1:
+            snapshot = eval(args.xstat1)
+            client.ports[1].get_xstats().reference_stats = snapshot
+        # Now we can call the official method to get differences.
+        xstats0 = client.get_xstats(0)
+        xstats1 = client.get_xstats(1)
+
+    # If STLError happens, let the script fail with stack trace.
+    finally:
+        client.disconnect()
+
+    print(u"##### statistics port 0 #####")
+    print(json.dumps(xstats0, indent=4, separators=(u",", u": ")))
+    print(u"##### statistics port 1 #####")
+    print(json.dumps(xstats1, indent=4, separators=(u",", u": ")))
+
+    tx_0, rx_0 = xstats0[u"tx_good_packets"], xstats0[u"rx_good_packets"]
+    tx_1, rx_1 = xstats1[u"tx_good_packets"], xstats1[u"rx_good_packets"]
+    lost_a, lost_b = tx_0 - rx_1, tx_1 - rx_0
+
+    print(f"\npackets lost from 0 --> 1:   {lost_a} pkts")
+    print(f"packets lost from 1 --> 0:   {lost_b} pkts")
+
+    total_rcvd, total_sent = rx_0 + rx_1, tx_0 + tx_1
+    total_lost = total_sent - total_rcvd
+    # TODO: Add latency.
+    print(
+        f"rate='unknown', total_received={total_rcvd}, "
+        f"total_sent={total_sent}, frame_loss={total_lost}, "
+        f"target_duration='manual', approximated_duration='manual', "
+        f"approximated_rate='unknown', "
+        f"latency_stream_0(usec)=-1/-1/-1, latency_stream_1(usec)=-1/-1/-1"
+    )
+
+
+if __name__ == u"__main__":
+    main()