ice: Add support for VLAN priority filters in switchdev

Enable support for adding TC rules that filter on the VLAN priority
in switchdev mode.

VLAN priority are the first 3 bits of 16b switch field vector word
which contain also vlan id value within its last 12 bits.
When getting vlan priority value from tc match.key it
has to be shifted first to proper bits positions (by VLAN_PRIO_SHIFT)
and then can be added to the joint 'vlan' field in ice_vlan_hdr
in lookup element.

The mask of lookup changes accordingly.
0x0FFF - when only vlan id is added in filter
0xE000 - when only vlan priority is added in filter
0xEFFF - when both these values are specified
Signed-off-by: Martyna Szapar-Mudlaw <martyna.szapar-mudlaw@linux.intel.com>
Tested-by: Sujai Buvaneswaran <sujai.buvaneswaran@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_tc_lib.c

@@ -51,11 +51,11 @@ ice_tc_count_lkups(u32 flags, struct ice_tc_flower_lyr_2_4_hdrs *headers,
 		lkups_cnt++;
 
 	/* is VLAN specified? */
-	if (flags & ICE_TC_FLWR_FIELD_VLAN)
+	if (flags & (ICE_TC_FLWR_FIELD_VLAN | ICE_TC_FLWR_FIELD_VLAN_PRIO))
 		lkups_cnt++;
 
 	/* is CVLAN specified? */
-	if (flags & ICE_TC_FLWR_FIELD_CVLAN)
+	if (flags & (ICE_TC_FLWR_FIELD_CVLAN | ICE_TC_FLWR_FIELD_CVLAN_PRIO))
 		lkups_cnt++;
 
 	/* are PPPoE options specified? */
@@ -389,7 +389,7 @@ ice_tc_fill_rules(struct ice_hw *hw, u32 flags,
 	}
 
 	/* copy VLAN info */
-	if (flags & ICE_TC_FLWR_FIELD_VLAN) {
+	if (flags & (ICE_TC_FLWR_FIELD_VLAN | ICE_TC_FLWR_FIELD_VLAN_PRIO)) {
 		vlan_tpid = be16_to_cpu(headers->vlan_hdr.vlan_tpid);
 		rule_info->vlan_type =
 				ice_check_supported_vlan_tpid(vlan_tpid);
@@ -398,15 +398,45 @@ ice_tc_fill_rules(struct ice_hw *hw, u32 flags,
 			list[i].type = ICE_VLAN_EX;
 		else
 			list[i].type = ICE_VLAN_OFOS;
-		list[i].h_u.vlan_hdr.vlan = headers->vlan_hdr.vlan_id;
-		list[i].m_u.vlan_hdr.vlan = cpu_to_be16(0xFFFF);
+
+		if (flags & ICE_TC_FLWR_FIELD_VLAN) {
+			list[i].h_u.vlan_hdr.vlan = headers->vlan_hdr.vlan_id;
+			list[i].m_u.vlan_hdr.vlan = cpu_to_be16(0x0FFF);
+		}
+
+		if (flags & ICE_TC_FLWR_FIELD_VLAN_PRIO) {
+			if (flags & ICE_TC_FLWR_FIELD_VLAN) {
+				list[i].m_u.vlan_hdr.vlan = cpu_to_be16(0xEFFF);
+			} else {
+				list[i].m_u.vlan_hdr.vlan = cpu_to_be16(0xE000);
+				list[i].h_u.vlan_hdr.vlan = 0;
+			}
+			list[i].h_u.vlan_hdr.vlan |=
+				headers->vlan_hdr.vlan_prio;
+		}
+
 		i++;
 	}
 
-	if (flags & ICE_TC_FLWR_FIELD_CVLAN) {
+	if (flags & (ICE_TC_FLWR_FIELD_CVLAN | ICE_TC_FLWR_FIELD_CVLAN_PRIO)) {
 		list[i].type = ICE_VLAN_IN;
-		list[i].h_u.vlan_hdr.vlan = headers->cvlan_hdr.vlan_id;
-		list[i].m_u.vlan_hdr.vlan = cpu_to_be16(0xFFFF);
+
+		if (flags & ICE_TC_FLWR_FIELD_CVLAN) {
+			list[i].h_u.vlan_hdr.vlan = headers->cvlan_hdr.vlan_id;
+			list[i].m_u.vlan_hdr.vlan = cpu_to_be16(0x0FFF);
+		}
+
+		if (flags & ICE_TC_FLWR_FIELD_CVLAN_PRIO) {
+			if (flags & ICE_TC_FLWR_FIELD_CVLAN) {
+				list[i].m_u.vlan_hdr.vlan = cpu_to_be16(0xEFFF);
+			} else {
+				list[i].m_u.vlan_hdr.vlan = cpu_to_be16(0xE000);
+				list[i].h_u.vlan_hdr.vlan = 0;
+			}
+			list[i].h_u.vlan_hdr.vlan |=
+				headers->cvlan_hdr.vlan_prio;
+		}
+
 		i++;
 	}
 
@@ -1280,16 +1310,22 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi,
 		if (match.mask->vlan_id) {
 			if (match.mask->vlan_id == VLAN_VID_MASK) {
 				fltr->flags |= ICE_TC_FLWR_FIELD_VLAN;
+				headers->vlan_hdr.vlan_id =
+					cpu_to_be16(match.key->vlan_id &
+						    VLAN_VID_MASK);
 			} else {
 				NL_SET_ERR_MSG_MOD(fltr->extack, "Bad VLAN mask");
 				return -EINVAL;
 			}
 		}
 
-		headers->vlan_hdr.vlan_id =
-				cpu_to_be16(match.key->vlan_id & VLAN_VID_MASK);
-		if (match.mask->vlan_priority)
-			headers->vlan_hdr.vlan_prio = match.key->vlan_priority;
+		if (match.mask->vlan_priority) {
+			fltr->flags |= ICE_TC_FLWR_FIELD_VLAN_PRIO;
+			headers->vlan_hdr.vlan_prio =
+				cpu_to_be16((match.key->vlan_priority <<
+					     VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK);
+		}
+
 		if (match.mask->vlan_tpid)
 			headers->vlan_hdr.vlan_tpid = match.key->vlan_tpid;
 	}
@@ -1307,6 +1343,9 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi,
 		if (match.mask->vlan_id) {
 			if (match.mask->vlan_id == VLAN_VID_MASK) {
 				fltr->flags |= ICE_TC_FLWR_FIELD_CVLAN;
+				headers->cvlan_hdr.vlan_id =
+					cpu_to_be16(match.key->vlan_id &
+						    VLAN_VID_MASK);
 			} else {
 				NL_SET_ERR_MSG_MOD(fltr->extack,
 						   "Bad CVLAN mask");
@@ -1314,10 +1353,12 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi,
 			}
 		}
 
-		headers->cvlan_hdr.vlan_id =
-				cpu_to_be16(match.key->vlan_id & VLAN_VID_MASK);
-		if (match.mask->vlan_priority)
-			headers->cvlan_hdr.vlan_prio = match.key->vlan_priority;
+		if (match.mask->vlan_priority) {
+			fltr->flags |= ICE_TC_FLWR_FIELD_CVLAN_PRIO;
+			headers->cvlan_hdr.vlan_prio =
+				cpu_to_be16((match.key->vlan_priority <<
+					     VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK);
+		}
 	}
 
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PPPOE)) {

drivers/net/ethernet/intel/ice/ice_tc_lib.h

@@ -31,6 +31,8 @@
 #define ICE_TC_FLWR_FIELD_ENC_IP_TOS		BIT(24)
 #define ICE_TC_FLWR_FIELD_ENC_IP_TTL		BIT(25)
 #define ICE_TC_FLWR_FIELD_L2TPV3_SESSID		BIT(26)
+#define ICE_TC_FLWR_FIELD_VLAN_PRIO		BIT(27)
+#define ICE_TC_FLWR_FIELD_CVLAN_PRIO		BIT(28)
 
 #define ICE_TC_FLOWER_MASK_32   0xFFFFFFFF
 
@@ -49,7 +51,7 @@ struct ice_tc_flower_action {
 
 struct ice_tc_vlan_hdr {
 	__be16 vlan_id; /* Only last 12 bits valid */
-	u16 vlan_prio; /* Only last 3 bits valid (valid values: 0..7) */
+	__be16 vlan_prio; /* Only last 3 bits valid (valid values: 0..7) */
 	__be16 vlan_tpid;
 };