[dpdk-stable] [PATCH] net/i40e: fix VF Tx error issue

[Beilei Xing]

When using kernel PF + DPDK VF, if setting VLAN strip on
or off in VF side after setting VLAN for VF with ethtool in
PF side, it will case VF Tx error. The root case is that
setting VLAN for VF in kernel PF side is to set PVID, then
Rx VLAN offload is not permitted.
This patch fixes the issue by check VLAN offload capability
when setting VLAN offload.

Fixes: 5f0b95d5 ("net/i40e: support VLAN stripping for VF")
Cc: stable at dpdk.org

Signed-off-by: Beilei Xing <beilei.xing at intel.com>
---
 drivers/net/i40e/i40e_ethdev_vf.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 91b5bb0..4927b14 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -1585,13 +1585,19 @@ static int
 i40evf_init_vlan(struct rte_eth_dev *dev)
 {
 	/* Apply vlan offload setting */
-	return i40evf_vlan_offload_set(dev, ETH_VLAN_STRIP_MASK);
+	i40evf_vlan_offload_set(dev, ETH_VLAN_STRIP_MASK);
+
+	return 0;
 }
 
 static int
 i40evf_vlan_offload_set(struct rte_eth_dev *dev, int mask)
 {
 	struct rte_eth_conf *dev_conf = &dev->data->dev_conf;
+	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
+
+	if (!(vf->vf_res->vf_offload_flags & VIRTCHNL_VF_OFFLOAD_VLAN))
+		return -ENOTSUP;
 
 	/* Vlan stripping setting */
 	if (mask & ETH_VLAN_STRIP_MASK) {
-- 
2.5.5