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>

drivers/net/ethernet/intel/ice/Makefile

@@ -27,7 +27,8 @@ ice-y := ice_main.o	\
 	 ice_fw_update.o \
 	 ice_lag.o	\
 	 ice_ethtool.o  \
-	 ice_repr.o
+	 ice_repr.o	\
+	 ice_tc_lib.o
 ice-$(CONFIG_PCI_IOV) += ice_virtchnl_allowlist.o
 ice-$(CONFIG_PCI_IOV) += ice_virtchnl_pf.o ice_sriov.o ice_virtchnl_fdir.o
 ice-$(CONFIG_PTP_1588_CLOCK) += ice_ptp.o ice_ptp_hw.o

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

@@ -64,6 +64,7 @@
 #include "ice_xsk.h"
 #include "ice_arfs.h"
 #include "ice_repr.h"
+#include "ice_eswitch.h"
 #include "ice_lag.h"
 
 #define ICE_BAR0		0
@@ -400,6 +401,7 @@ enum ice_pf_flags {
 	ICE_FLAG_PTP,			/* PTP is enabled by software */
 	ICE_FLAG_AUX_ENA,
 	ICE_FLAG_ADV_FEATURES,
+	ICE_FLAG_CLS_FLOWER,
 	ICE_FLAG_LINK_DOWN_ON_CLOSE_ENA,
 	ICE_FLAG_TOTAL_PORT_SHUTDOWN_ENA,
 	ICE_FLAG_NO_MEDIA,
@@ -512,6 +514,8 @@ struct ice_pf {
 	int aux_idx;
 	u32 sw_int_count;
 
+	struct hlist_head tc_flower_fltr_list;
+
 	__le64 nvm_phy_type_lo; /* NVM PHY type low */
 	__le64 nvm_phy_type_hi; /* NVM PHY type high */
 	struct ice_link_default_override_tlv link_dflt_override;

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

@@ -20,6 +20,7 @@
 #define CREATE_TRACE_POINTS
 #include "ice_trace.h"
 #include "ice_eswitch.h"
+#include "ice_tc_lib.h"
 
 #define DRV_SUMMARY	"Intel(R) Ethernet Connection E800 Series Linux Driver"
 static const char ice_driver_string[] = DRV_SUMMARY;
@@ -3107,6 +3108,9 @@ static void ice_set_netdev_features(struct net_device *netdev)
 
 	/* enable features */
 	netdev->features |= netdev->hw_features;
+
+	netdev->hw_features |= NETIF_F_HW_TC;
+
 	/* encap and VLAN devices inherit default, csumo and tso features */
 	netdev->hw_enc_features |= dflt_features | csumo_features |
 				   tso_features;
@@ -7069,6 +7073,72 @@ static void ice_tx_timeout(struct net_device *netdev, unsigned int txqueue)
 	pf->tx_timeout_recovery_level++;
 }
 
+/**
+ * ice_setup_tc_cls_flower - flower classifier offloads
+ * @np: net device to configure
+ * @filter_dev: device on which filter is added
+ * @cls_flower: offload data
+ */
+static int
+ice_setup_tc_cls_flower(struct ice_netdev_priv *np,
+			struct net_device *filter_dev,
+			struct flow_cls_offload *cls_flower)
+{
+	struct ice_vsi *vsi = np->vsi;
+
+	if (cls_flower->common.chain_index)
+		return -EOPNOTSUPP;
+
+	switch (cls_flower->command) {
+	case FLOW_CLS_REPLACE:
+		return ice_add_cls_flower(filter_dev, vsi, cls_flower);
+	case FLOW_CLS_DESTROY:
+		return ice_del_cls_flower(vsi, cls_flower);
+	default:
+		return -EINVAL;
+	}
+}
+
+/**
+ * ice_setup_tc_block_cb - callback handler registered for TC block
+ * @type: TC SETUP type
+ * @type_data: TC flower offload data that contains user input
+ * @cb_priv: netdev private data
+ */
+static int
+ice_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
+{
+	struct ice_netdev_priv *np = cb_priv;
+
+	switch (type) {
+	case TC_SETUP_CLSFLOWER:
+		return ice_setup_tc_cls_flower(np, np->vsi->netdev,
+					       type_data);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static LIST_HEAD(ice_block_cb_list);
+
+static int
+ice_setup_tc(struct net_device *netdev, enum tc_setup_type type,
+	     void *type_data)
+{
+	struct ice_netdev_priv *np = netdev_priv(netdev);
+
+	switch (type) {
+	case TC_SETUP_BLOCK:
+		return flow_block_cb_setup_simple(type_data,
+						  &ice_block_cb_list,
+						  ice_setup_tc_block_cb,
+						  np, np, true);
+	default:
+		return -EOPNOTSUPP;
+	}
+	return -EOPNOTSUPP;
+}
+
 /**
  * ice_open - Called when a network interface becomes active
  * @netdev: network interface device structure
@@ -7273,6 +7343,7 @@ static const struct net_device_ops ice_netdev_ops = {
 	.ndo_get_vf_stats = ice_get_vf_stats,
 	.ndo_vlan_rx_add_vid = ice_vlan_rx_add_vid,
 	.ndo_vlan_rx_kill_vid = ice_vlan_rx_kill_vid,
+	.ndo_setup_tc = ice_setup_tc,
 	.ndo_set_features = ice_set_features,
 	.ndo_bridge_getlink = ice_bridge_getlink,
 	.ndo_bridge_setlink = ice_bridge_setlink,

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

+/* 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_ */