ice: ndo_setup_tc implementation for PF

Implement ndo_setup_tc net device callback for TC HW offload on PF device.

ndo_setup_tc provides support for HW offloading various TC filters.
Add support for configuring the following filter with tc-flower:
- default L2 filters (src/dst mac addresses, ethertype, VLAN)
- variations of L3, L3+L4, L2+L3+L4 filters using advanced filters
(including ipv4 and ipv6 addresses).

Allow for adding/removing TC flows when PF device is configured in
eswitch switchdev mode. Two types of actions are supported at the
moment: FLOW_ACTION_DROP and FLOW_ACTION_REDIRECT.

Co-developed-by: Priyalee Kushwaha <priyalee.kushwaha@intel.com>
Signed-off-by: Priyalee Kushwaha <priyalee.kushwaha@intel.com>
Signed-off-by: Kiran Patil <kiran.patil@intel.com>
Signed-off-by: Wojciech Drewek <wojciech.drewek@intel.com>
Tested-by: Sandeep Penigalapati <sandeep.penigalapati@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_tc_lib.h b/drivers/net/ethernet/intel/ice/ice_tc_lib.h
new file mode 100644
index 000000000000..883d2891f92c
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.h
@@ -0,0 +1,129 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2019-2021, Intel Corporation. */
+
+#ifndef _ICE_TC_LIB_H_
+#define _ICE_TC_LIB_H_
+
+#define ICE_TC_FLWR_FIELD_DST_MAC		BIT(0)
+#define ICE_TC_FLWR_FIELD_SRC_MAC		BIT(1)
+#define ICE_TC_FLWR_FIELD_VLAN			BIT(2)
+#define ICE_TC_FLWR_FIELD_DEST_IPV4		BIT(3)
+#define ICE_TC_FLWR_FIELD_SRC_IPV4		BIT(4)
+#define ICE_TC_FLWR_FIELD_DEST_IPV6		BIT(5)
+#define ICE_TC_FLWR_FIELD_SRC_IPV6		BIT(6)
+#define ICE_TC_FLWR_FIELD_DEST_L4_PORT		BIT(7)
+#define ICE_TC_FLWR_FIELD_SRC_L4_PORT		BIT(8)
+#define ICE_TC_FLWR_FIELD_TENANT_ID		BIT(9)
+#define ICE_TC_FLWR_FIELD_ENC_DEST_IPV4		BIT(10)
+#define ICE_TC_FLWR_FIELD_ENC_SRC_IPV4		BIT(11)
+#define ICE_TC_FLWR_FIELD_ENC_DEST_IPV6		BIT(12)
+#define ICE_TC_FLWR_FIELD_ENC_SRC_IPV6		BIT(13)
+#define ICE_TC_FLWR_FIELD_ENC_DEST_L4_PORT	BIT(14)
+#define ICE_TC_FLWR_FIELD_ENC_SRC_L4_PORT	BIT(15)
+#define ICE_TC_FLWR_FIELD_ENC_DST_MAC		BIT(16)
+#define ICE_TC_FLWR_FIELD_ETH_TYPE_ID		BIT(17)
+
+struct ice_tc_flower_action {
+	u32 tc_class;
+	enum ice_sw_fwd_act_type fltr_act;
+};
+
+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) */
+};
+
+struct ice_tc_l2_hdr {
+	u8 dst_mac[ETH_ALEN];
+	u8 src_mac[ETH_ALEN];
+	__be16 n_proto;    /* Ethernet Protocol */
+};
+
+struct ice_tc_l3_hdr {
+	u8 ip_proto;    /* IPPROTO value */
+	union {
+		struct {
+			struct in_addr dst_ip;
+			struct in_addr src_ip;
+		} v4;
+		struct {
+			struct in6_addr dst_ip6;
+			struct in6_addr src_ip6;
+		} v6;
+	} ip;
+#define dst_ipv6	ip.v6.dst_ip6.s6_addr32
+#define dst_ipv6_addr	ip.v6.dst_ip6.s6_addr
+#define src_ipv6	ip.v6.src_ip6.s6_addr32
+#define src_ipv6_addr	ip.v6.src_ip6.s6_addr
+#define dst_ipv4	ip.v4.dst_ip.s_addr
+#define src_ipv4	ip.v4.src_ip.s_addr
+
+	u8 tos;
+	u8 ttl;
+};
+
+struct ice_tc_l4_hdr {
+	__be16 dst_port;
+	__be16 src_port;
+};
+
+struct ice_tc_flower_lyr_2_4_hdrs {
+	/* L2 layer fields with their mask */
+	struct ice_tc_l2_hdr l2_key;
+	struct ice_tc_l2_hdr l2_mask;
+	struct ice_tc_vlan_hdr vlan_hdr;
+	/* L3 (IPv4[6]) layer fields with their mask */
+	struct ice_tc_l3_hdr l3_key;
+	struct ice_tc_l3_hdr l3_mask;
+
+	/* L4 layer fields with their mask */
+	struct ice_tc_l4_hdr l4_key;
+	struct ice_tc_l4_hdr l4_mask;
+};
+
+enum ice_eswitch_fltr_direction {
+	ICE_ESWITCH_FLTR_INGRESS,
+	ICE_ESWITCH_FLTR_EGRESS,
+};
+
+struct ice_tc_flower_fltr {
+	struct hlist_node tc_flower_node;
+
+	/* cookie becomes filter_rule_id if rule is added successfully */
+	unsigned long cookie;
+
+	/* add_adv_rule returns information like recipe ID, rule_id. Store
+	 * those values since they are needed to remove advanced rule
+	 */
+	u16 rid;
+	u16 rule_id;
+	/* this could be queue/vsi_idx (sw handle)/queue_group, depending upon
+	 * destination type
+	 */
+	u16 dest_id;
+	/* if dest_id is vsi_idx, then need to store destination VSI ptr */
+	struct ice_vsi *dest_vsi;
+	/* direction of fltr for eswitch use case */
+	enum ice_eswitch_fltr_direction direction;
+
+	/* Parsed TC flower configuration params */
+	struct ice_tc_flower_lyr_2_4_hdrs outer_headers;
+	struct ice_tc_flower_lyr_2_4_hdrs inner_headers;
+	struct ice_vsi *src_vsi;
+	__be32 tenant_id;
+	u32 flags;
+	struct ice_tc_flower_action	action;
+
+	/* cache ptr which is used wherever needed to communicate netlink
+	 * messages
+	 */
+	struct netlink_ext_ack *extack;
+};
+
+int
+ice_add_cls_flower(struct net_device *netdev, struct ice_vsi *vsi,
+		   struct flow_cls_offload *cls_flower);
+int
+ice_del_cls_flower(struct ice_vsi *vsi, struct flow_cls_offload *cls_flower);
+
+#endif /* _ICE_TC_LIB_H_ */