[dts][PATCH V5 7/8] test_plans/vlan: modify script and test plan to support i40e fimware >= 8.4

[Weiyuan Li <weiyuanx.li@intel.com>]

Modify script and test plan to i40e support fimware >= 8.4.
When the fimrware >= 8.4, if the filter is to take effect need to enable
extend.

Signed-off-by: Weiyuan Li <weiyuanx.li@intel.com>
---
Tested-by: Song Jiale <songx.jiale@intel.com>

v2:
-use the firmware version to judge whether to add command `extend on`.
v3:
-modify description.
v4:
-modify comments.
-dual_vlan test plan modify table and add header.
v5:
-fix some typos.

 test_plans/vlan_test_plan.rst | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/test_plans/vlan_test_plan.rst b/test_plans/vlan_test_plan.rst
index 6e2bf74e..394b3ba4 100644
--- a/test_plans/vlan_test_plan.rst
+++ b/test_plans/vlan_test_plan.rst
@@ -61,6 +61,11 @@ Enable the receipt of VLAN packets with VLAN Tag Identifier 1 on port 0::
 
   testpmd> rx_vlan add 1 0
   testpmd> vlan set strip off 0
+  
+  Due to the kernel enables Qinq and cannot be closed, the DPDK only add `extend on` to make the VLAN filter
+  work normally. Therefore, if the i40e firmware version >= 8.4 the DPDK can only add `extend on` to make the VLAN filter work normally:
+  testpmd> vlan set extend on 0
+  
   testpmd> start
     rxonly packet forwarding - CRC stripping disabled - packets/burst=32
     nb forwarding cores=1 - nb forwarding ports=10
@@ -111,7 +116,11 @@ Test Case: Disable receipt of VLAN packets
 Disable the receipt of VLAN packets with Tag Identifier ``1`` on port 0.
 Send VLAN packets with the Tag Identifier ``1`` check that no packet is received
 on port ``B``, meaning that VLAN packets are now dropped on port 0::
-
+  
+  Due to the kernel enables Qinq and cannot be closed, the DPDK only add `extend on` to make the VLAN filter
+  work normally. Therefore, if the i40e firmware version >= 8.4 the DPDK can only add `extend on` to make the VLAN filter work normally:
+  testpmd> vlan set extend on 0
+  
   testpmd> rx_vlan rm 1 0
   testpmd> start
   rxonly packet forwarding - CRC stripping disabled - packets/burst=32
-- 
2.27.0