[dts][PATCH V3 3/8] test_plans/ipgre: modify script and test plan to support i40e fimware >= 8.4

[Weiyuan Li]

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 at intel.com>
---
Tested-by: Song Jiale <songx.jiale at intel.com>

v2:
-use the firmware version to judge whether to add command `extend on`.
v3:
-modify description.

 test_plans/ipgre_test_plan.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/test_plans/ipgre_test_plan.rst b/test_plans/ipgre_test_plan.rst
index 693432ef..20360171 100644
--- a/test_plans/ipgre_test_plan.rst
+++ b/test_plans/ipgre_test_plan.rst
@@ -58,6 +58,9 @@ Start testpmd and enable rxonly forwarding mode::
     testpmd> set verbose 1
     testpmd> start
 
+    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
+
 Send packet as table listed and packet type match each layer::
 
    Ether()/IPv6(nh=47)/GRE()/IP()/UDP()/Raw('x'*40)
-- 
2.27.0