[PATCH] net/i40e: fix QinQ stripping

[Anurag Mandal <anurag.mandal@intel.com>]

Outer VLAN strip gets disabled when inner VLAN
stripping is enabled/disabled after enabling outer
VLAN stripping.
This happens because the respective register of
gets overridden by the VSI params update of
inner VLAN stripping.

This patch fixes the issue by re-enabling outer
VLAN stripping after modification of inner
VLAN stripping.

Fixes: c52ff36686a4 ("net/i40e: enable QinQ stripping")
Cc: stable@dpdk.org

Signed-off-by: Anurag Mandal <anurag.mandal@intel.com>
---
 drivers/net/intel/i40e/i40e_ethdev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/intel/i40e/i40e_ethdev.c b/drivers/net/intel/i40e/i40e_ethdev.c
index b8ce79061b..c8153f3351 100644
--- a/drivers/net/intel/i40e/i40e_ethdev.c
+++ b/drivers/net/intel/i40e/i40e_ethdev.c
@@ -4150,6 +4150,16 @@ i40e_vlan_offload_set(struct rte_eth_dev *dev, int mask)
 			i40e_vsi_config_vlan_stripping(vsi, TRUE);
 		else
 			i40e_vsi_config_vlan_stripping(vsi, FALSE);
+
+		/* When VLAN strip is enabled/disabled
+		 * after enabling outer VLAN stripping,
+		 * outer VLAN stripping gets disabled
+		 * as the register gets overridden by
+		 * VLAN's strip vsi param update.
+		 * Hence, re-enable outer VLAN stripping.
+		 */
+		if (rxmode->offloads & RTE_ETH_RX_OFFLOAD_QINQ_STRIP)
+			i40e_vsi_config_outer_vlan_stripping(vsi, TRUE);
 	}
 
 	if (mask & RTE_ETH_VLAN_EXTEND_MASK) {
-- 
2.43.0