[dts] [PATCH V2] tests/vf_offload: optimize script

[Song Jiale <songx.jiale@intel.com>]

in general, vfs do not need to enable trust on. some intree drivers have
a issue that vfs with trust on cannot receive vf vlan packets, and
this issue will not be fixed. in order not to affect subsequent case
testing, do not enable trust on unnecessarily.

Signed-off-by: Song Jiale <songx.jiale@intel.com>
---
 tests/TestSuite_vf_offload.py | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

V2:
-modify the comment description

diff --git a/tests/TestSuite_vf_offload.py b/tests/TestSuite_vf_offload.py
index 9475ef22..47f6351b 100644
--- a/tests/TestSuite_vf_offload.py
+++ b/tests/TestSuite_vf_offload.py
@@ -91,20 +91,21 @@ class TestVfOffload(TestCase):
         self.host_intf_0 = self.dut.ports_info[self.used_dut_port_0]["intf"]
         self.host_intf_1 = self.dut.ports_info[self.used_dut_port_1]["intf"]
 
-        self.ip_link_set(
-            host_intf=self.host_intf_0,
-            cmd="vf",
-            port=0,
-            types="trust",
-            value="on",
-        )
-        self.ip_link_set(
-            host_intf=self.host_intf_1,
-            cmd="vf",
-            port=0,
-            types="trust",
-            value="on",
-        )
+        if self.dcf_mode:
+            self.ip_link_set(
+                host_intf=self.host_intf_0,
+                cmd="vf",
+                port=0,
+                types="trust",
+                value="on",
+            )
+            self.ip_link_set(
+                host_intf=self.host_intf_1,
+                cmd="vf",
+                port=0,
+                types="trust",
+                value="on",
+            )
         self.ip_link_set(
             host_intf=self.host_intf_0,
             cmd="vf",
-- 
2.25.1