selftests: concurrency: add test to verify parallel rules insertion

Implement test that verifies parallel rules insertion by adding 1 million
flower filters with 10 concurrent tc instances. Put it to standalone
'concurrency' category.

Implement tdc_multibatch.py helper script that is used to generate multiple
batch files for concurrent tc execution. Extend config with new 'BATCH_DIR'
variable to specify temporary output directory that is used to store batch
files generated by tdc_multibatch.py.
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/tc-testing/tc-tests/filters/concurrency.json

+[
+    {
+        "id": "e41d",
+        "name": "Add 1M flower filters with 10 parallel tc instances",
+        "category": [
+            "filter",
+            "flower",
+            "concurrency"
+        ],
+        "setup": [
+            "/bin/mkdir $BATCH_DIR",
+            "$TC qdisc add dev $DEV2 ingress",
+            "./tdc_multibatch.py $DEV2 $BATCH_DIR 100000 10 add"
+        ],
+        "cmdUnderTest": "find $BATCH_DIR/add* -print | xargs -n 1 -P 10 $TC -b",
+        "expExitCode": "0",
+        "verifyCmd": "$TC -s filter show dev $DEV2 ingress",
+        "matchPattern": "filter protocol ip pref 1 flower chain 0 handle",
+        "matchCount": "1000000",
+        "teardown": [
+            "$TC qdisc del dev $DEV2 ingress",
+            "/bin/rm -rf $BATCH_DIR"
+        ]
+    }
+]

tools/testing/selftests/tc-testing/tdc_config.py

@@ -15,6 +15,7 @@ NAMES = {
           'DEV1': 'v0p1',
           'DEV2': '',
           'BATCH_FILE': './batch.txt',
+          'BATCH_DIR': 'tmp',
           # Length of time in seconds to wait before terminating a command
           'TIMEOUT': 12,
           # Name of the namespace to use

tools/testing/selftests/tc-testing/tdc_multibatch.py

+#!/usr/bin/python3
+# SPDX-License-Identifier: GPL-2.0
+"""
+tdc_multibatch.py - a thin wrapper over tdc_batch.py to generate multiple batch
+files
+
+Copyright (C) 2019 Vlad Buslov <vladbu@mellanox.com>
+"""
+
+import argparse
+import os
+
+parser = argparse.ArgumentParser(
+    description='TC multiple batch file generator')
+parser.add_argument("device", help="device name")
+parser.add_argument("dir", help="where to put batch files")
+parser.add_argument(
+    "num_filters", type=int, help="how many lines per batch file")
+parser.add_argument("num_files", type=int, help="how many batch files")
+parser.add_argument(
+    "operation",
+    choices=['add', 'del', 'replace'],
+    help="operation to perform on filters")
+args = parser.parse_args()
+
+device = args.device
+dir = args.dir
+file_prefix = args.operation + "_"
+num_filters = args.num_filters
+num_files = args.num_files
+operation = args.operation
+handle = 1
+
+for i in range(num_files):
+    file = dir + '/' + file_prefix + str(i)
+    os.system("./tdc_batch.py -n {} -a {} -e {} -m {} {} {}".format(
+        num_filters, handle, operation, i, device, file))
+    handle += num_filters