[PATCH net-next 05/15] ice: add 0x88E7 handling to SW validation paths

[Tony Nguyen <anthony.l.nguyen@intel.com>]

From: Aleksandr Loktionov <aleksandr.loktionov@intel.com>

The virtchnl v2 VLAN capability handshake now includes the new
VIRTCHNL_VLAN_ETHERTYPE_88E7 flag for IEEE 802.1ah B-TAG support.
Wire up the corresponding software-path handling in ice so the PF
correctly accepts and translates 0x88E7 (ETH_P_8021AH) VLAN filters
requested by VFs.

Three software-only changes, no hardware offload path affected:

 - ice_check_supported_vlan_tpid() (ice_tc_lib.c): accept ETH_P_8021AH
   in the TC VLAN TPID validation switch so 0x88E7-tagged flower filters
   are not rejected early.

 - validate_vlan() (ice_vsi_vlan_lib.c): allow ETH_P_8021AH as a valid
   TPID when adding VLAN filters to a VSI, consistent with the other
   accepted dot1q/dot1ad/QinQ1 TPIDs.

 - ice_vc_validate_vlan_tpid() / ice_vc_get_tpid() (virt/virtchnl.c):
   bidirectional translation between ETH_P_8021AH and
   VIRTCHNL_VLAN_ETHERTYPE_88E7 in the virtchnl VLAN v2 filter path.

This does not add 0x88E7 hardware offload capability, does not change
outer-tag programming, and does not alter any datapath.

Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_tc_lib.c       | 1 +
 drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c | 3 ++-
 drivers/net/ethernet/intel/ice/virt/virtchnl.c    | 6 ++++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_tc_lib.c b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
index d20357c04127..4560e55c8f9c 100644
--- a/drivers/net/ethernet/intel/ice/ice_tc_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
@@ -174,6 +174,7 @@ static u16 ice_check_supported_vlan_tpid(u16 vlan_tpid)
 	case ETH_P_8021Q:
 	case ETH_P_8021AD:
 	case ETH_P_QINQ1:
+	case ETH_P_8021AH:
 		return vlan_tpid;
 	default:
 		return 0;
diff --git a/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c b/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c
index 54984966851d..b67272e2f603 100644
--- a/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c
@@ -24,7 +24,8 @@ static void print_invalid_tpid(struct ice_vsi *vsi, u16 tpid)
 static bool validate_vlan(struct ice_vsi *vsi, struct ice_vlan *vlan)
 {
 	if (vlan->tpid != ETH_P_8021Q && vlan->tpid != ETH_P_8021AD &&
-	    vlan->tpid != ETH_P_QINQ1 && (vlan->tpid || vlan->vid)) {
+	    vlan->tpid != ETH_P_QINQ1 && vlan->tpid != ETH_P_8021AH &&
+	    (vlan->tpid || vlan->vid)) {
 		print_invalid_tpid(vsi, vlan->tpid);
 		return false;
 	}
diff --git a/drivers/net/ethernet/intel/ice/virt/virtchnl.c b/drivers/net/ethernet/intel/ice/virt/virtchnl.c
index ca8018e3dd42..06d2f9be93ae 100644
--- a/drivers/net/ethernet/intel/ice/virt/virtchnl.c
+++ b/drivers/net/ethernet/intel/ice/virt/virtchnl.c
@@ -1702,6 +1702,9 @@ static bool ice_vc_validate_vlan_tpid(u16 filtering_caps, u16 tpid)
 	case ETH_P_QINQ1:
 		vlan_ethertype = VIRTCHNL_VLAN_ETHERTYPE_9100;
 		break;
+	case ETH_P_8021AH:
+		vlan_ethertype = VIRTCHNL_VLAN_ETHERTYPE_88E7;
+		break;
 	}
 
 	if (!(filtering_caps & vlan_ethertype))
@@ -2136,6 +2139,9 @@ static int ice_vc_get_tpid(u32 ethertype_setting, u16 *tpid)
 	case VIRTCHNL_VLAN_ETHERTYPE_9100:
 		*tpid = ETH_P_QINQ1;
 		break;
+	case VIRTCHNL_VLAN_ETHERTYPE_88E7:
+		*tpid = ETH_P_8021AH;
+		break;
 	default:
 		*tpid = 0;
 		return -EINVAL;
-- 
2.47.1