selftests: concurrency: add test to verify concurrent replace

Implement test that verifies concurrent replacement of rules by executing
10 tc instances that replace flower filters in same handle range.

Extend tdc_multibatch.py script with new optional CLI argument that is used
to generate all batch files with same filter handle range.
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

@@ -71,5 +71,30 @@
             "$TC qdisc del dev $DEV2 ingress",
             "/bin/rm -rf $BATCH_DIR"
         ]
+    },
+    {
+        "id": "14be",
+        "name": "Concurrently replace same range of 100k flower filters from 10 tc instances",
+        "category": [
+            "filter",
+            "flower",
+            "concurrency"
+        ],
+        "setup": [
+            "/bin/mkdir $BATCH_DIR",
+            "$TC qdisc add dev $DEV2 ingress",
+            "./tdc_multibatch.py $DEV2 $BATCH_DIR 100000 1 add",
+            "$TC -b $BATCH_DIR/add_0",
+            "./tdc_multibatch.py -d $DEV2 $BATCH_DIR 100000 10 replace"
+        ],
+        "cmdUnderTest": "find $BATCH_DIR/replace* -print | xargs -n 1 -P 10 $TC -b",
+        "expExitCode": "0",
+        "verifyCmd": "$TC -s filter show dev $DEV2 ingress",
+        "matchPattern": "filter protocol ip pref 1 flower chain 0 handle",
+        "matchCount": "100000",
+        "teardown": [
+            "$TC qdisc del dev $DEV2 ingress",
+            "/bin/rm -rf $BATCH_DIR"
+        ]
     }
 ]

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

@@ -21,6 +21,11 @@ parser.add_argument(
     "operation",
     choices=['add', 'del', 'replace'],
     help="operation to perform on filters")
+parser.add_argument(
+    "-d",
+    "--duplicate_handles",
+    action="store_true",
+    help="duplicate filter handle range in all files")
 args = parser.parse_args()
 
 device = args.device
@@ -29,10 +34,12 @@ file_prefix = args.operation + "_"
 num_filters = args.num_filters
 num_files = args.num_files
 operation = args.operation
+duplicate_handles = args.duplicate_handles
 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
+    if not duplicate_handles:
+        handle += num_filters