[PATCH v3] i40e: fix the type issue of a single VLAN type

[Beilei Xing <beilei.xing@intel.com>]

In current i40e codebase, if single VLAN header is added in a packet,
it's treated as inner VLAN. Generally, a single VLAN header is
treated as the outer VLAN header. So change corresponding register
for single VLAN.

Fixes: 19b16e2f6442 ("ethdev: add vlan type when setting ether type")

Signed-off-by: Beilei Xing <beilei.xing@intel.com>
---
v3 changes:
 Note it as a "fixed issue" in the i40e driver.
 Reword the title.
v2 changes:
 Combine corresponding i40e driver changes into this patch.
 
 doc/guides/rel_notes/release_16_07.rst |  7 +++++++
 drivers/net/i40e/i40e_ethdev.c         | 29 ++++++++++++++++++++---------
 lib/librte_ether/rte_ethdev.h          |  4 ++--
 3 files changed, 29 insertions(+), 11 deletions(-)

diff --git a/doc/guides/rel_notes/release_16_07.rst b/doc/guides/rel_notes/release_16_07.rst
index 7aeacb2..f6912a7 100644
--- a/doc/guides/rel_notes/release_16_07.rst
+++ b/doc/guides/rel_notes/release_16_07.rst
@@ -113,6 +113,13 @@ Drivers
   info to descriptor.
   Now this issue is fixed by disabling vlan stripping from inner header.
 
+* **i40e: Fixed the type issue of a single VLAN type.**
+
+  Currently, if a single VLAN header is added in a packet, it's treated
+  as inner VLAN. But generally, a single VLAN header is treated as the
+  outer VLAN header.
+  This issue is fixed by changing corresponding register for single VLAN.
+
 
 Libraries
 ~~~~~~~~~
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index f94ad87..838889e 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -924,12 +924,6 @@ eth_i40e_dev_init(struct rte_eth_dev *dev)
 			     "VLAN ether type");
 		goto err_setup_pf_switch;
 	}
-	ret = i40e_vlan_tpid_set(dev, ETH_VLAN_TYPE_INNER, ETHER_TYPE_VLAN);
-	if (ret != I40E_SUCCESS) {
-		PMD_INIT_LOG(ERR, "Failed to set the default outer "
-			     "VLAN ether type");
-		goto err_setup_pf_switch;
-	}
 
 	/* PF setup, which includes VSI setup */
 	ret = i40e_pf_setup(pf);
@@ -2442,13 +2436,24 @@ i40e_vlan_tpid_set(struct rte_eth_dev *dev,
 	uint64_t reg_r = 0, reg_w = 0;
 	uint16_t reg_id = 0;
 	int ret = 0;
+	int qinq = dev->data->dev_conf.rxmode.hw_vlan_extend;
 
 	switch (vlan_type) {
 	case ETH_VLAN_TYPE_OUTER:
-		reg_id = 2;
+		if (qinq)
+			reg_id = 2;
+		else
+			reg_id = 3;
 		break;
 	case ETH_VLAN_TYPE_INNER:
-		reg_id = 3;
+		if (qinq)
+			reg_id = 3;
+		else {
+			ret = -EINVAL;
+			PMD_DRV_LOG(ERR, "Unsupported vlan type"
+				    "in single vlan.\n");
+			return ret;
+		}
 		break;
 	default:
 		ret = -EINVAL;
@@ -2510,8 +2515,14 @@ i40e_vlan_offload_set(struct rte_eth_dev *dev, int mask)
 	}
 
 	if (mask & ETH_VLAN_EXTEND_MASK) {
-		if (dev->data->dev_conf.rxmode.hw_vlan_extend)
+		if (dev->data->dev_conf.rxmode.hw_vlan_extend) {
 			i40e_vsi_config_double_vlan(vsi, TRUE);
+			/* Set global registers with default ether type value */
+			i40e_vlan_tpid_set(dev, ETH_VLAN_TYPE_OUTER,
+					   ETHER_TYPE_VLAN);
+			i40e_vlan_tpid_set(dev, ETH_VLAN_TYPE_INNER,
+					   ETHER_TYPE_VLAN);
+		}
 		else
 			i40e_vsi_config_double_vlan(vsi, FALSE);
 	}
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index bd93bf6..6804a86 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -363,8 +363,8 @@ struct rte_eth_rxmode {
  */
 enum rte_vlan_type {
 	ETH_VLAN_TYPE_UNKNOWN = 0,
-	ETH_VLAN_TYPE_INNER, /**< Single VLAN, or inner VLAN. */
-	ETH_VLAN_TYPE_OUTER, /**< Outer VLAN. */
+	ETH_VLAN_TYPE_INNER, /**< Inner VLAN. */
+	ETH_VLAN_TYPE_OUTER, /**< Single VLAN, or outer VLAN. */
 	ETH_VLAN_TYPE_MAX,
 };
 
-- 
2.5.0