Add check of dut type and kvm support flag in ptf_runner

tests/ptf_runner.py

@@ -32,13 +32,32 @@ def ptf_collect(host, log_file, skip_pcap=False):
         allure.attach.file(filename_pcap, 'ptf_pcap: ' + filename_pcap, allure.attachment_type.PCAP)
 
 
+def get_dut_type(host):
+    dut_type_exists = host.stat(path="/sonic/dut_type.txt")
+    if dut_type_exists["stat"]["exists"]:
+        dut_type = host.shell("cat /sonic/dut_type.txt")["stdout"]
+        if dut_type:
+            logger.info("DUT type is {}".format(dut_type))
+            return dut_type.lower()
+        else:
+            logger.warning("DUT type file is empty.")
+    else:
+        logger.warning("DUT type file doesn't exist.")
+    return "Unknown"
+
+
 def ptf_runner(host, testdir, testname, platform_dir=None, params={},
                platform="remote", qlen=0, relax=True, debug_level="info",
                socket_recv_size=None, log_file=None, device_sockets=[], timeout=0, custom_options="",
                module_ignore_errors=False, is_python3=False):
     # Call virtual env ptf for migrated py3 scripts.
     # ptf will load all scripts under ptftests, it will throw error for py2 scripts.
     # So move migrated scripts to seperated py3 folder avoid impacting py2 scripts.
+    dut_type = get_dut_type(host)
+    if dut_type == "kvm" and params.get("kvm_support", True) is False:
+        logger.info("Skip test case {} for not support on KVM DUT".format(testname))
+        return True
+
     if is_python3:
         path_exists = host.stat(path="/root/env-python3/bin/ptf")
         if path_exists["stat"]["exists"]: