[PATCH v5] net/i40e: fix error disable double VLAN

[Han, YingyaX]

-----Original Message-----
From: Kevin Liu <kevinx.liu at intel.com> 
Sent: Wednesday, June 29, 2022 11:40 PM
To: dev at dpdk.org
Cc: Xing, Beilei <beilei.xing at intel.com>; Zhang, Yuying <yuying.zhang at intel.com>; Yang, SteveX <stevex.yang at intel.com>; Liu, KevinX <kevinx.liu at intel.com>
Subject: [PATCH v5] net/i40e: fix error disable double VLAN

Enable double VLAN by default after firmware v8.3 and disable double VLAN is not allowed in subsequent operations.

Fixes: 4f13a78f1b8f ("net/i40e: add outer VLAN processing")
Signed-off-by: Kevin Liu <kevinx.liu at intel.com>

The performance of X710 drop about 45% when testing nic_single_core.