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

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2019-2021, Intel Corporation. */

#include "ice.h"
#include "ice_tc_lib.h"
#include "ice_lib.h"
#include "ice_fltr.h"

/**
 * ice_tc_count_lkups - determine lookup count for switch filter
 * @flags: TC-flower flags
 * @headers: Pointer to TC flower filter header structure
 * @fltr: Pointer to outer TC filter structure
 *
 * Determine lookup count based on TC flower input for switch filter.
 */
static int
ice_tc_count_lkups(u32 flags, struct ice_tc_flower_lyr_2_4_hdrs *headers,
		   struct ice_tc_flower_fltr *fltr)
{
	int lkups_cnt = 0;

	if (flags & ICE_TC_FLWR_FIELD_ETH_TYPE_ID)
		lkups_cnt++;

	/* are MAC fields specified? */
	if (flags & (ICE_TC_FLWR_FIELD_DST_MAC | ICE_TC_FLWR_FIELD_SRC_MAC))
		lkups_cnt++;

	/* is VLAN specified? */
	if (flags & ICE_TC_FLWR_FIELD_VLAN)
		lkups_cnt++;

	/* are IPv[4|6] fields specified? */
	if (flags & (ICE_TC_FLWR_FIELD_DEST_IPV4 | ICE_TC_FLWR_FIELD_SRC_IPV4))
		lkups_cnt++;
	else if (flags & (ICE_TC_FLWR_FIELD_DEST_IPV6 |
			  ICE_TC_FLWR_FIELD_SRC_IPV6))
		lkups_cnt++;

	/* is L4 (TCP/UDP/any other L4 protocol fields) specified? */
	if (flags & (ICE_TC_FLWR_FIELD_DEST_L4_PORT |
		     ICE_TC_FLWR_FIELD_SRC_L4_PORT))
		lkups_cnt++;

	return lkups_cnt;
}

/**
 * ice_tc_fill_rules - fill filter rules based on TC fltr
 * @hw: pointer to HW structure
 * @flags: tc flower field flags
 * @tc_fltr: pointer to TC flower filter
 * @list: list of advance rule elements
 * @rule_info: pointer to information about rule
 * @l4_proto: pointer to information such as L4 proto type
 *
 * Fill ice_adv_lkup_elem list based on TC flower flags and
 * TC flower headers. This list should be used to add
 * advance filter in hardware.
 */
static int
ice_tc_fill_rules(struct ice_hw *hw, u32 flags,
		  struct ice_tc_flower_fltr *tc_fltr,
		  struct ice_adv_lkup_elem *list,
		  struct ice_adv_rule_info *rule_info,
		  u16 *l4_proto)
{
	struct ice_tc_flower_lyr_2_4_hdrs *headers = &tc_fltr->outer_headers;
	int i = 0;

	if (flags & ICE_TC_FLWR_FIELD_ETH_TYPE_ID) {
		list[i].type = ICE_ETYPE_OL;
		list[i].h_u.ethertype.ethtype_id = headers->l2_key.n_proto;
		list[i].m_u.ethertype.ethtype_id = headers->l2_mask.n_proto;
		i++;
	}

	if (flags & (ICE_TC_FLWR_FIELD_DST_MAC |
		     ICE_TC_FLWR_FIELD_SRC_MAC)) {
		struct ice_tc_l2_hdr *l2_key, *l2_mask;

		l2_key = &headers->l2_key;
		l2_mask = &headers->l2_mask;

		list[i].type = ICE_MAC_OFOS;
		if (flags & ICE_TC_FLWR_FIELD_DST_MAC) {
			ether_addr_copy(list[i].h_u.eth_hdr.dst_addr,
					l2_key->dst_mac);
			ether_addr_copy(list[i].m_u.eth_hdr.dst_addr,
					l2_mask->dst_mac);
		}
		if (flags & ICE_TC_FLWR_FIELD_SRC_MAC) {
			ether_addr_copy(list[i].h_u.eth_hdr.src_addr,
					l2_key->src_mac);
			ether_addr_copy(list[i].m_u.eth_hdr.src_addr,
					l2_mask->src_mac);
		}
		i++;
	}

	/* copy VLAN info */
	if (flags & ICE_TC_FLWR_FIELD_VLAN) {
		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);
		i++;
	}

	/* copy L3 (IPv[4|6]: src, dest) address */
	if (flags & (ICE_TC_FLWR_FIELD_DEST_IPV4 |
		     ICE_TC_FLWR_FIELD_SRC_IPV4)) {
		struct ice_tc_l3_hdr *l3_key, *l3_mask;

		list[i].type = ICE_IPV4_OFOS;
		l3_key = &headers->l3_key;
		l3_mask = &headers->l3_mask;
		if (flags & ICE_TC_FLWR_FIELD_DEST_IPV4) {
			list[i].h_u.ipv4_hdr.dst_addr = l3_key->dst_ipv4;
			list[i].m_u.ipv4_hdr.dst_addr = l3_mask->dst_ipv4;
		}
		if (flags & ICE_TC_FLWR_FIELD_SRC_IPV4) {
			list[i].h_u.ipv4_hdr.src_addr = l3_key->src_ipv4;
			list[i].m_u.ipv4_hdr.src_addr = l3_mask->src_ipv4;
		}
		i++;
	} else if (flags & (ICE_TC_FLWR_FIELD_DEST_IPV6 |
			    ICE_TC_FLWR_FIELD_SRC_IPV6)) {
		struct ice_ipv6_hdr *ipv6_hdr, *ipv6_mask;
		struct ice_tc_l3_hdr *l3_key, *l3_mask;

		list[i].type = ICE_IPV6_OFOS;
		ipv6_hdr = &list[i].h_u.ipv6_hdr;
		ipv6_mask = &list[i].m_u.ipv6_hdr;
		l3_key = &headers->l3_key;
		l3_mask = &headers->l3_mask;

		if (flags & ICE_TC_FLWR_FIELD_DEST_IPV6) {
			memcpy(&ipv6_hdr->dst_addr, &l3_key->dst_ipv6_addr,
			       sizeof(l3_key->dst_ipv6_addr));
			memcpy(&ipv6_mask->dst_addr, &l3_mask->dst_ipv6_addr,
			       sizeof(l3_mask->dst_ipv6_addr));
		}
		if (flags & ICE_TC_FLWR_FIELD_SRC_IPV6) {
			memcpy(&ipv6_hdr->src_addr, &l3_key->src_ipv6_addr,
			       sizeof(l3_key->src_ipv6_addr));
			memcpy(&ipv6_mask->src_addr, &l3_mask->src_ipv6_addr,
			       sizeof(l3_mask->src_ipv6_addr));
		}
		i++;
	}

	/* copy L4 (src, dest) port */
	if (flags & (ICE_TC_FLWR_FIELD_DEST_L4_PORT |
		     ICE_TC_FLWR_FIELD_SRC_L4_PORT)) {
		struct ice_tc_l4_hdr *l4_key, *l4_mask;

		l4_key = &headers->l4_key;
		l4_mask = &headers->l4_mask;
		if (headers->l3_key.ip_proto == IPPROTO_TCP) {
			list[i].type = ICE_TCP_IL;
			/* detected L4 proto is TCP */
			if (l4_proto)
				*l4_proto = IPPROTO_TCP;
		} else if (headers->l3_key.ip_proto == IPPROTO_UDP) {
			list[i].type = ICE_UDP_ILOS;
			/* detected L4 proto is UDP */
			if (l4_proto)
				*l4_proto = IPPROTO_UDP;
		}
		if (flags & ICE_TC_FLWR_FIELD_DEST_L4_PORT) {
			list[i].h_u.l4_hdr.dst_port = l4_key->dst_port;
			list[i].m_u.l4_hdr.dst_port = l4_mask->dst_port;
		}
		if (flags & ICE_TC_FLWR_FIELD_SRC_L4_PORT) {
			list[i].h_u.l4_hdr.src_port = l4_key->src_port;
			list[i].m_u.l4_hdr.src_port = l4_mask->src_port;
		}
		i++;
	}

	return i;
}

static int
ice_eswitch_tc_parse_action(struct ice_tc_flower_fltr *fltr,
			    struct flow_action_entry *act)
{
	struct ice_repr *repr;

	switch (act->id) {
	case FLOW_ACTION_DROP:
		fltr->action.fltr_act = ICE_DROP_PACKET;
		break;

	case FLOW_ACTION_REDIRECT:
		fltr->action.fltr_act = ICE_FWD_TO_VSI;

		if (ice_is_port_repr_netdev(act->dev)) {
			repr = ice_netdev_to_repr(act->dev);

			fltr->dest_vsi = repr->src_vsi;
			fltr->direction = ICE_ESWITCH_FLTR_INGRESS;
		} else if (netif_is_ice(act->dev)) {
			struct ice_netdev_priv *np = netdev_priv(act->dev);

			fltr->dest_vsi = np->vsi;
			fltr->direction = ICE_ESWITCH_FLTR_EGRESS;
		} else {
			NL_SET_ERR_MSG_MOD(fltr->extack, "Unsupported netdevice in switchdev mode");
			return -EINVAL;
		}

		break;

	default:
		NL_SET_ERR_MSG_MOD(fltr->extack, "Unsupported action in switchdev mode");
		return -EINVAL;
	}

	return 0;
}

static int
ice_eswitch_add_tc_fltr(struct ice_vsi *vsi, struct ice_tc_flower_fltr *fltr)
{
	struct ice_tc_flower_lyr_2_4_hdrs *headers = &fltr->outer_headers;
	struct ice_adv_rule_info rule_info = { 0 };
	struct ice_rule_query_data rule_added;
	struct ice_hw *hw = &vsi->back->hw;
	struct ice_adv_lkup_elem *list;
	u32 flags = fltr->flags;
	enum ice_status status;
	int lkups_cnt;
	int ret = 0;
	int i;

	if (!flags || (flags & (ICE_TC_FLWR_FIELD_ENC_DEST_IPV4 |
				ICE_TC_FLWR_FIELD_ENC_SRC_IPV4 |
				ICE_TC_FLWR_FIELD_ENC_DEST_IPV6 |
				ICE_TC_FLWR_FIELD_ENC_SRC_IPV6 |
				ICE_TC_FLWR_FIELD_ENC_SRC_L4_PORT))) {
		NL_SET_ERR_MSG_MOD(fltr->extack, "Unsupported encap field(s)");
		return -EOPNOTSUPP;
	}

	lkups_cnt = ice_tc_count_lkups(flags, headers, fltr);
	list = kcalloc(lkups_cnt, sizeof(*list), GFP_ATOMIC);
	if (!list)
		return -ENOMEM;

	i = ice_tc_fill_rules(hw, flags, fltr, list, &rule_info, NULL);
	if (i != lkups_cnt) {
		ret = -EINVAL;
		goto exit;
	}

	rule_info.sw_act.fltr_act = fltr->action.fltr_act;
	if (fltr->action.fltr_act != ICE_DROP_PACKET)
		rule_info.sw_act.vsi_handle = fltr->dest_vsi->idx;
	/* For now, making priority to be highest, and it also becomes
	 * the priority for recipe which will get created as a result of
	 * new extraction sequence based on input set.
	 * Priority '7' is max val for switch recipe, higher the number
	 * results into order of switch rule evaluation.
	 */
	rule_info.priority = 7;

	if (fltr->direction == ICE_ESWITCH_FLTR_INGRESS) {
		rule_info.sw_act.flag |= ICE_FLTR_RX;
		rule_info.sw_act.src = hw->pf_id;
		rule_info.rx = true;
	} else {
		rule_info.sw_act.flag |= ICE_FLTR_TX;
		rule_info.sw_act.src = vsi->idx;
		rule_info.rx = false;
	}

	/* specify the cookie as filter_rule_id */
	rule_info.fltr_rule_id = fltr->cookie;

	status = ice_add_adv_rule(hw, list, lkups_cnt, &rule_info, &rule_added);
	if (status == ICE_ERR_ALREADY_EXISTS) {
		NL_SET_ERR_MSG_MOD(fltr->extack, "Unable to add filter because it already exist");
		ret = -EINVAL;
		goto exit;
	} else if (status) {
		NL_SET_ERR_MSG_MOD(fltr->extack, "Unable to add filter due to error");
		ret = -EIO;
		goto exit;
	}

	/* store the output params, which are needed later for removing
	 * advanced switch filter
	 */
	fltr->rid = rule_added.rid;
	fltr->rule_id = rule_added.rule_id;

	if (fltr->direction == ICE_ESWITCH_FLTR_EGRESS) {
		if (ice_fltr_update_flags(vsi, fltr->rule_id, fltr->rid,
					  ICE_SINGLE_ACT_LAN_ENABLE))
			ice_rem_adv_rule_by_id(hw, &rule_added);
	}

exit:
	kfree(list);
	return ret;
}

/**
 * ice_tc_set_ipv4 - Parse IPv4 addresses from TC flower filter
 * @match: Pointer to flow match structure
 * @fltr: Pointer to filter structure
 * @headers: inner or outer header fields
 */
static int
ice_tc_set_ipv4(struct flow_match_ipv4_addrs *match,
		struct ice_tc_flower_fltr *fltr,
		struct ice_tc_flower_lyr_2_4_hdrs *headers)
{
	if (match->key->dst) {
		fltr->flags |= ICE_TC_FLWR_FIELD_DEST_IPV4;
		headers->l3_key.dst_ipv4 = match->key->dst;
		headers->l3_mask.dst_ipv4 = match->mask->dst;
	}
	if (match->key->src) {
		fltr->flags |= ICE_TC_FLWR_FIELD_SRC_IPV4;
		headers->l3_key.src_ipv4 = match->key->src;
		headers->l3_mask.src_ipv4 = match->mask->src;
	}
	return 0;
}

/**
 * ice_tc_set_ipv6 - Parse IPv6 addresses from TC flower filter
 * @match: Pointer to flow match structure
 * @fltr: Pointer to filter structure
 * @headers: inner or outer header fields
 */
static int
ice_tc_set_ipv6(struct flow_match_ipv6_addrs *match,
		struct ice_tc_flower_fltr *fltr,
		struct ice_tc_flower_lyr_2_4_hdrs *headers)
{
	struct ice_tc_l3_hdr *l3_key, *l3_mask;

	/* src and dest IPV6 address should not be LOOPBACK
	 * (0:0:0:0:0:0:0:1), which can be represented as ::1
	 */
	if (ipv6_addr_loopback(&match->key->dst) ||
	    ipv6_addr_loopback(&match->key->src)) {
		NL_SET_ERR_MSG_MOD(fltr->extack, "Bad IPv6, addr is LOOPBACK");
		return -EINVAL;
	}
	/* if src/dest IPv6 address is *,* error */
	if (ipv6_addr_any(&match->mask->dst) &&
	    ipv6_addr_any(&match->mask->src)) {
		NL_SET_ERR_MSG_MOD(fltr->extack, "Bad src/dest IPv6, addr is any");
		return -EINVAL;
	}
	if (!ipv6_addr_any(&match->mask->dst))
		fltr->flags |= ICE_TC_FLWR_FIELD_DEST_IPV6;
	if (!ipv6_addr_any(&match->mask->src))
		fltr->flags |= ICE_TC_FLWR_FIELD_SRC_IPV6;

	l3_key = &headers->l3_key;
	l3_mask = &headers->l3_mask;

	if (fltr->flags & ICE_TC_FLWR_FIELD_SRC_IPV6) {
		memcpy(&l3_key->src_ipv6_addr, &match->key->src.s6_addr,
		       sizeof(match->key->src.s6_addr));
		memcpy(&l3_mask->src_ipv6_addr, &match->mask->src.s6_addr,
		       sizeof(match->mask->src.s6_addr));
	}
	if (fltr->flags & ICE_TC_FLWR_FIELD_DEST_IPV6) {
		memcpy(&l3_key->dst_ipv6_addr, &match->key->dst.s6_addr,
		       sizeof(match->key->dst.s6_addr));
		memcpy(&l3_mask->dst_ipv6_addr, &match->mask->dst.s6_addr,
		       sizeof(match->mask->dst.s6_addr));
	}

	return 0;
}

/**
 * ice_tc_set_port - Parse ports from TC flower filter
 * @match: Flow match structure
 * @fltr: Pointer to filter structure
 * @headers: inner or outer header fields
 */
static int
ice_tc_set_port(struct flow_match_ports match,
		struct ice_tc_flower_fltr *fltr,
		struct ice_tc_flower_lyr_2_4_hdrs *headers)
{
	if (match.key->dst) {
		fltr->flags |= ICE_TC_FLWR_FIELD_DEST_L4_PORT;
		headers->l4_key.dst_port = match.key->dst;
		headers->l4_mask.dst_port = match.mask->dst;
	}
	if (match.key->src) {
		fltr->flags |= ICE_TC_FLWR_FIELD_SRC_L4_PORT;
		headers->l4_key.src_port = match.key->src;
		headers->l4_mask.src_port = match.mask->src;
	}
	return 0;
}

/**
 * ice_parse_cls_flower - Parse TC flower filters provided by kernel
 * @vsi: Pointer to the VSI
 * @filter_dev: Pointer to device on which filter is being added
 * @f: Pointer to struct flow_cls_offload
 * @fltr: Pointer to filter structure
 */
static int
ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi,
		     struct flow_cls_offload *f,
		     struct ice_tc_flower_fltr *fltr)
{
	struct ice_tc_flower_lyr_2_4_hdrs *headers = &fltr->outer_headers;
	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
	u16 n_proto_mask = 0, n_proto_key = 0, addr_type = 0;
	struct flow_dissector *dissector;

	dissector = rule->match.dissector;

	if (dissector->used_keys &
	    ~(BIT(FLOW_DISSECTOR_KEY_CONTROL) |
	      BIT(FLOW_DISSECTOR_KEY_BASIC) |
	      BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
	      BIT(FLOW_DISSECTOR_KEY_VLAN) |
	      BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
	      BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
	      BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) |
	      BIT(FLOW_DISSECTOR_KEY_ENC_IP) |
	      BIT(FLOW_DISSECTOR_KEY_PORTS))) {
		NL_SET_ERR_MSG_MOD(fltr->extack, "Unsupported key used");
		return -EOPNOTSUPP;
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
		struct flow_match_basic match;

		flow_rule_match_basic(rule, &match);

		n_proto_key = ntohs(match.key->n_proto);
		n_proto_mask = ntohs(match.mask->n_proto);

		if (n_proto_key == ETH_P_ALL || n_proto_key == 0) {
			n_proto_key = 0;
			n_proto_mask = 0;
		} else {
			fltr->flags |= ICE_TC_FLWR_FIELD_ETH_TYPE_ID;
		}

		headers->l2_key.n_proto = cpu_to_be16(n_proto_key);
		headers->l2_mask.n_proto = cpu_to_be16(n_proto_mask);
		headers->l3_key.ip_proto = match.key->ip_proto;
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
		struct flow_match_eth_addrs match;

		flow_rule_match_eth_addrs(rule, &match);

		if (!is_zero_ether_addr(match.key->dst)) {
			ether_addr_copy(headers->l2_key.dst_mac,
					match.key->dst);
			ether_addr_copy(headers->l2_mask.dst_mac,
					match.mask->dst);
			fltr->flags |= ICE_TC_FLWR_FIELD_DST_MAC;
		}

		if (!is_zero_ether_addr(match.key->src)) {
			ether_addr_copy(headers->l2_key.src_mac,
					match.key->src);
			ether_addr_copy(headers->l2_mask.src_mac,
					match.mask->src);
			fltr->flags |= ICE_TC_FLWR_FIELD_SRC_MAC;
		}
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN) ||
	    is_vlan_dev(filter_dev)) {
		struct flow_dissector_key_vlan mask;
		struct flow_dissector_key_vlan key;
		struct flow_match_vlan match;

		if (is_vlan_dev(filter_dev)) {
			match.key = &key;
			match.key->vlan_id = vlan_dev_vlan_id(filter_dev);
			match.key->vlan_priority = 0;
			match.mask = &mask;
			memset(match.mask, 0xff, sizeof(*match.mask));
			match.mask->vlan_priority = 0;
		} else {
			flow_rule_match_vlan(rule, &match);
		}

		if (match.mask->vlan_id) {
			if (match.mask->vlan_id == VLAN_VID_MASK) {
				fltr->flags |= ICE_TC_FLWR_FIELD_VLAN;
			} 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 (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
		struct flow_match_control match;

		flow_rule_match_control(rule, &match);

		addr_type = match.key->addr_type;
	}

	if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
		struct flow_match_ipv4_addrs match;

		flow_rule_match_ipv4_addrs(rule, &match);
		if (ice_tc_set_ipv4(&match, fltr, headers))
			return -EINVAL;
	}

	if (addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
		struct flow_match_ipv6_addrs match;

		flow_rule_match_ipv6_addrs(rule, &match);
		if (ice_tc_set_ipv6(&match, fltr, headers))
			return -EINVAL;
	}

	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS)) {
		struct flow_match_ports match;

		flow_rule_match_ports(rule, &match);
		if (ice_tc_set_port(match, fltr, headers))
			return -EINVAL;
		switch (headers->l3_key.ip_proto) {
		case IPPROTO_TCP:
		case IPPROTO_UDP:
			break;
		default:
			NL_SET_ERR_MSG_MOD(fltr->extack, "Only UDP and TCP transport are supported");
			return -EINVAL;
		}
	}
	return 0;
}

/**
 * ice_add_switch_fltr - Add TC flower filters
 * @vsi: Pointer to VSI
 * @fltr: Pointer to struct ice_tc_flower_fltr
 *
 * Add filter in HW switch block
 */
static int
ice_add_switch_fltr(struct ice_vsi *vsi, struct ice_tc_flower_fltr *fltr)
{
	if (ice_is_eswitch_mode_switchdev(vsi->back))
		return ice_eswitch_add_tc_fltr(vsi, fltr);

	return -EOPNOTSUPP;
}

/**
 * ice_handle_tclass_action - Support directing to a traffic class
 * @vsi: Pointer to VSI
 * @cls_flower: Pointer to TC flower offload structure
 * @fltr: Pointer to TC flower filter structure
 *
 * Support directing traffic to a traffic class
 */
static int
ice_handle_tclass_action(struct ice_vsi *vsi,
			 struct flow_cls_offload *cls_flower,
			 struct ice_tc_flower_fltr *fltr)
{
	int tc = tc_classid_to_hwtc(vsi->netdev, cls_flower->classid);

	if (tc < 0) {
		NL_SET_ERR_MSG_MOD(fltr->extack, "Unable to add filter because specified destination is invalid");
		return -EINVAL;
	}
	if (!tc) {
		NL_SET_ERR_MSG_MOD(fltr->extack, "Unable to add filter because of invalid destination");
		return -EINVAL;
	}

	if (!(vsi->tc_cfg.ena_tc & BIT(tc))) {
		NL_SET_ERR_MSG_MOD(fltr->extack, "Unable to add filter because of non-existence destination");
		return -EINVAL;
	}

	/* Redirect to a TC class or Queue Group */
	fltr->action.fltr_act = ICE_FWD_TO_QGRP;
	fltr->action.tc_class = tc;

	return 0;
}

/**
 * ice_parse_tc_flower_actions - Parse the actions for a TC filter
 * @vsi: Pointer to VSI
 * @cls_flower: Pointer to TC flower offload structure
 * @fltr: Pointer to TC flower filter structure
 *
 * Parse the actions for a TC filter
 */
static int
ice_parse_tc_flower_actions(struct ice_vsi *vsi,
			    struct flow_cls_offload *cls_flower,
			    struct ice_tc_flower_fltr *fltr)
{
	struct flow_rule *rule = flow_cls_offload_flow_rule(cls_flower);
	struct flow_action *flow_action = &rule->action;
	struct flow_action_entry *act;
	int i;

	if (cls_flower->classid)
		return ice_handle_tclass_action(vsi, cls_flower, fltr);

	if (!flow_action_has_entries(flow_action))
		return -EINVAL;

	flow_action_for_each(i, act, flow_action) {
		if (ice_is_eswitch_mode_switchdev(vsi->back)) {
			int err = ice_eswitch_tc_parse_action(fltr, act);

			if (err)
				return err;
			continue;
		}
		/* Allow only one rule per filter */

		/* Drop action */
		if (act->id == FLOW_ACTION_DROP) {
			fltr->action.fltr_act = ICE_DROP_PACKET;
			return 0;
		}
		fltr->action.fltr_act = ICE_FWD_TO_VSI;
	}
	return 0;
}

/**
 * ice_del_tc_fltr - deletes a filter from HW table
 * @vsi: Pointer to VSI
 * @fltr: Pointer to struct ice_tc_flower_fltr
 *
 * This function deletes a filter from HW table and manages book-keeping
 */
static int ice_del_tc_fltr(struct ice_vsi *vsi, struct ice_tc_flower_fltr *fltr)
{
	struct ice_rule_query_data rule_rem;
	struct ice_pf *pf = vsi->back;
	int err;

	rule_rem.rid = fltr->rid;
	rule_rem.rule_id = fltr->rule_id;
	rule_rem.vsi_handle = fltr->dest_id;
	err = ice_rem_adv_rule_by_id(&pf->hw, &rule_rem);
	if (err) {
		if (err == ICE_ERR_DOES_NOT_EXIST) {
			NL_SET_ERR_MSG_MOD(fltr->extack, "Filter does not exist");
			return -ENOENT;
		}
		NL_SET_ERR_MSG_MOD(fltr->extack, "Failed to delete TC flower filter");
		return -EIO;
	}

	return 0;
}

/**
 * ice_add_tc_fltr - adds a TC flower filter
 * @netdev: Pointer to netdev
 * @vsi: Pointer to VSI
 * @f: Pointer to flower offload structure
 * @__fltr: Pointer to struct ice_tc_flower_fltr
 *
 * This function parses TC-flower input fields, parses action,
 * and adds a filter.
 */
static int
ice_add_tc_fltr(struct net_device *netdev, struct ice_vsi *vsi,
		struct flow_cls_offload *f,
		struct ice_tc_flower_fltr **__fltr)
{
	struct ice_tc_flower_fltr *fltr;
	int err;

	/* by default, set output to be INVALID */
	*__fltr = NULL;

	fltr = kzalloc(sizeof(*fltr), GFP_KERNEL);
	if (!fltr)
		return -ENOMEM;

	fltr->cookie = f->cookie;
	fltr->extack = f->common.extack;
	fltr->src_vsi = vsi;
	INIT_HLIST_NODE(&fltr->tc_flower_node);

	err = ice_parse_cls_flower(netdev, vsi, f, fltr);
	if (err < 0)
		goto err;

	err = ice_parse_tc_flower_actions(vsi, f, fltr);
	if (err < 0)
		goto err;

	err = ice_add_switch_fltr(vsi, fltr);
	if (err < 0)
		goto err;

	/* return the newly created filter */
	*__fltr = fltr;

	return 0;
err:
	kfree(fltr);
	return err;
}

/**
 * ice_find_tc_flower_fltr - Find the TC flower filter in the list
 * @pf: Pointer to PF
 * @cookie: filter specific cookie
 */
static struct ice_tc_flower_fltr *
ice_find_tc_flower_fltr(struct ice_pf *pf, unsigned long cookie)
{
	struct ice_tc_flower_fltr *fltr;

	hlist_for_each_entry(fltr, &pf->tc_flower_fltr_list, tc_flower_node)
		if (cookie == fltr->cookie)
			return fltr;

	return NULL;
}

/**
 * ice_add_cls_flower - add TC flower filters
 * @netdev: Pointer to filter device
 * @vsi: Pointer to VSI
 * @cls_flower: Pointer to flower offload structure
 */
int
ice_add_cls_flower(struct net_device *netdev, struct ice_vsi *vsi,
		   struct flow_cls_offload *cls_flower)
{
	struct netlink_ext_ack *extack = cls_flower->common.extack;
	struct net_device *vsi_netdev = vsi->netdev;
	struct ice_tc_flower_fltr *fltr;
	struct ice_pf *pf = vsi->back;
	int err;

	if (ice_is_reset_in_progress(pf->state))
		return -EBUSY;
	if (test_bit(ICE_FLAG_FW_LLDP_AGENT, pf->flags))
		return -EINVAL;

	if (ice_is_port_repr_netdev(netdev))
		vsi_netdev = netdev;

	if (!(vsi_netdev->features & NETIF_F_HW_TC) &&
	    !test_bit(ICE_FLAG_CLS_FLOWER, pf->flags)) {
		/* Based on TC indirect notifications from kernel, all ice
		 * devices get an instance of rule from higher level device.
		 * Avoid triggering explicit error in this case.
		 */
		if (netdev == vsi_netdev)
			NL_SET_ERR_MSG_MOD(extack, "can't apply TC flower filters, turn ON hw-tc-offload and try again");
		return -EINVAL;
	}

	/* avoid duplicate entries, if exists - return error */
	fltr = ice_find_tc_flower_fltr(pf, cls_flower->cookie);
	if (fltr) {
		NL_SET_ERR_MSG_MOD(extack, "filter cookie already exists, ignoring");
		return -EEXIST;
	}

	/* prep and add TC-flower filter in HW */
	err = ice_add_tc_fltr(netdev, vsi, cls_flower, &fltr);
	if (err)
		return err;

	/* add filter into an ordered list */
	hlist_add_head(&fltr->tc_flower_node, &pf->tc_flower_fltr_list);
	return 0;
}

/**
 * ice_del_cls_flower - delete TC flower filters
 * @vsi: Pointer to VSI
 * @cls_flower: Pointer to struct flow_cls_offload
 */
int
ice_del_cls_flower(struct ice_vsi *vsi, struct flow_cls_offload *cls_flower)
{
	struct ice_tc_flower_fltr *fltr;
	struct ice_pf *pf = vsi->back;
	int err;

	/* find filter */
	fltr = ice_find_tc_flower_fltr(pf, cls_flower->cookie);
	if (!fltr) {
		if (hlist_empty(&pf->tc_flower_fltr_list))
			return 0;

		NL_SET_ERR_MSG_MOD(cls_flower->common.extack, "failed to delete TC flower filter because unable to find it");
		return -EINVAL;
	}

	fltr->extack = cls_flower->common.extack;
	/* delete filter from HW */
	err = ice_del_tc_fltr(vsi, fltr);
	if (err)
		return err;

	/* delete filter from an ordered list */
	hlist_del(&fltr->tc_flower_node);

	/* free the filter node */
	kfree(fltr);

	return 0;
}

/**
 * ice_replay_tc_fltrs - replay TC filters
 * @pf: pointer to PF struct
 */
void ice_replay_tc_fltrs(struct ice_pf *pf)
{
	struct ice_tc_flower_fltr *fltr;
	struct hlist_node *node;

	hlist_for_each_entry_safe(fltr, node,
				  &pf->tc_flower_fltr_list,
				  tc_flower_node) {
		fltr->extack = NULL;
		ice_add_switch_fltr(fltr->src_vsi, fltr);
	}
}