// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2018-2020, Intel Corporation. */

#include "ice.h"
#include <net/rps.h>

/**
 * ice_is_arfs_active - helper to check is aRFS is active
 * @vsi: VSI to check
 */
static bool ice_is_arfs_active(struct ice_vsi *vsi)
{
        return !!vsi->arfs_fltr_list;
}

/**
 * ice_is_arfs_using_perfect_flow - check if aRFS has active perfect filters
 * @hw: pointer to the HW structure
 * @flow_type: flow type as Flow Director understands it
 *
 * Flow Director will query this function to see if aRFS is currently using
 * the specified flow_type for perfect (4-tuple) filters.
 */
bool
ice_is_arfs_using_perfect_flow(struct ice_hw *hw, enum ice_fltr_ptype flow_type)
{
        struct ice_arfs_active_fltr_cntrs *arfs_fltr_cntrs;
        struct ice_pf *pf = hw->back;
        struct ice_vsi *vsi;

        vsi = ice_get_main_vsi(pf);
        if (!vsi)
                return false;

        arfs_fltr_cntrs = vsi->arfs_fltr_cntrs;

        /* active counters can be updated by multiple CPUs */
        smp_mb__before_atomic();
        switch (flow_type) {
        case ICE_FLTR_PTYPE_NONF_IPV4_UDP:
                return atomic_read(&arfs_fltr_cntrs->active_udpv4_cnt) > 0;
        case ICE_FLTR_PTYPE_NONF_IPV6_UDP:
                return atomic_read(&arfs_fltr_cntrs->active_udpv6_cnt) > 0;
        case ICE_FLTR_PTYPE_NONF_IPV4_TCP:
                return atomic_read(&arfs_fltr_cntrs->active_tcpv4_cnt) > 0;
        case ICE_FLTR_PTYPE_NONF_IPV6_TCP:
                return atomic_read(&arfs_fltr_cntrs->active_tcpv6_cnt) > 0;
        default:
                return false;
        }
}

/**
 * ice_arfs_update_active_fltr_cntrs - update active filter counters for aRFS
 * @vsi: VSI that aRFS is active on
 * @entry: aRFS entry used to change counters
 * @add: true to increment counter, false to decrement
 */
static void
ice_arfs_update_active_fltr_cntrs(struct ice_vsi *vsi,
                                  struct ice_arfs_entry *entry, bool add)
{
        struct ice_arfs_active_fltr_cntrs *fltr_cntrs = vsi->arfs_fltr_cntrs;

        switch (entry->fltr_info.flow_type) {
        case ICE_FLTR_PTYPE_NONF_IPV4_TCP:
                if (add)
                        atomic_inc(&fltr_cntrs->active_tcpv4_cnt);
                else
                        atomic_dec(&fltr_cntrs->active_tcpv4_cnt);
                break;
        case ICE_FLTR_PTYPE_NONF_IPV6_TCP:
                if (add)
                        atomic_inc(&fltr_cntrs->active_tcpv6_cnt);
                else
                        atomic_dec(&fltr_cntrs->active_tcpv6_cnt);
                break;
        case ICE_FLTR_PTYPE_NONF_IPV4_UDP:
                if (add)
                        atomic_inc(&fltr_cntrs->active_udpv4_cnt);
                else
                        atomic_dec(&fltr_cntrs->active_udpv4_cnt);
                break;
        case ICE_FLTR_PTYPE_NONF_IPV6_UDP:
                if (add)
                        atomic_inc(&fltr_cntrs->active_udpv6_cnt);
                else
                        atomic_dec(&fltr_cntrs->active_udpv6_cnt);
                break;
        default:
                dev_err(ice_pf_to_dev(vsi->back), "aRFS: Failed to update filter counters, invalid filter type %d\n",
                        entry->fltr_info.flow_type);
        }
}

/**
 * ice_arfs_del_flow_rules - delete the rules passed in from HW
 * @vsi: VSI for the flow rules that need to be deleted
 * @del_list_head: head of the list of ice_arfs_entry(s) for rule deletion
 *
 * Loop through the delete list passed in and remove the rules from HW. After
 * each rule is deleted, disconnect and free the ice_arfs_entry because it is no
 * longer being referenced by the aRFS hash table.
 */
static void
ice_arfs_del_flow_rules(struct ice_vsi *vsi, struct hlist_head *del_list_head)
{
        struct ice_arfs_entry *e;
        struct hlist_node *n;
        struct device *dev;

        dev = ice_pf_to_dev(vsi->back);

        hlist_for_each_entry_safe(e, n, del_list_head, list_entry) {
                int result;

                result = ice_fdir_write_fltr(vsi->back, &e->fltr_info, false,
                                             false);
                if (!result)
                        ice_arfs_update_active_fltr_cntrs(vsi, e, false);
                else
                        dev_dbg(dev, "Unable to delete aRFS entry, err %d fltr_state %d fltr_id %d flow_id %d Q %d\n",
                                result, e->fltr_state, e->fltr_info.fltr_id,
                                e->flow_id, e->fltr_info.q_index);

                /* The aRFS hash table is no longer referencing this entry */
                hlist_del(&e->list_entry);
                devm_kfree(dev, e);
        }
}

/**
 * ice_arfs_add_flow_rules - add the rules passed in from HW
 * @vsi: VSI for the flow rules that need to be added
 * @add_list_head: head of the list of ice_arfs_entry_ptr(s) for rule addition
 *
 * Loop through the add list passed in and remove the rules from HW. After each
 * rule is added, disconnect and free the ice_arfs_entry_ptr node. Don't free
 * the ice_arfs_entry(s) because they are still being referenced in the aRFS
 * hash table.
 */
static void
ice_arfs_add_flow_rules(struct ice_vsi *vsi, struct hlist_head *add_list_head)
{
        struct ice_arfs_entry_ptr *ep;
        struct hlist_node *n;
        struct device *dev;

        dev = ice_pf_to_dev(vsi->back);

        hlist_for_each_entry_safe(ep, n, add_list_head, list_entry) {
                int result;

                result = ice_fdir_write_fltr(vsi->back,
                                             &ep->arfs_entry->fltr_info, true,
                                             false);
                if (!result)
                        ice_arfs_update_active_fltr_cntrs(vsi, ep->arfs_entry,
                                                          true);
                else
                        dev_dbg(dev, "Unable to add aRFS entry, err %d fltr_state %d fltr_id %d flow_id %d Q %d\n",
                                result, ep->arfs_entry->fltr_state,
                                ep->arfs_entry->fltr_info.fltr_id,
                                ep->arfs_entry->flow_id,
                                ep->arfs_entry->fltr_info.q_index);

                hlist_del(&ep->list_entry);
                devm_kfree(dev, ep);
        }
}

/**
 * ice_arfs_is_flow_expired - check if the aRFS entry has expired
 * @vsi: VSI containing the aRFS entry
 * @arfs_entry: aRFS entry that's being checked for expiration
 *
 * Return true if the flow has expired, else false. This function should be used
 * to determine whether or not an aRFS entry should be removed from the hardware
 * and software structures.
 */
static bool
ice_arfs_is_flow_expired(struct ice_vsi *vsi, struct ice_arfs_entry *arfs_entry)
{
#define ICE_ARFS_TIME_DELTA_EXPIRATION  msecs_to_jiffies(5000)
        if (rps_may_expire_flow(vsi->netdev, arfs_entry->fltr_info.q_index,
                                arfs_entry->flow_id,
                                arfs_entry->fltr_info.fltr_id))
                return true;

        /* expiration timer only used for UDP filters */
        if (arfs_entry->fltr_info.flow_type != ICE_FLTR_PTYPE_NONF_IPV4_UDP &&
            arfs_entry->fltr_info.flow_type != ICE_FLTR_PTYPE_NONF_IPV6_UDP)
                return false;

        return time_in_range64(arfs_entry->time_activated +
                               ICE_ARFS_TIME_DELTA_EXPIRATION,
                               arfs_entry->time_activated, get_jiffies_64());
}

/**
 * ice_arfs_update_flow_rules - add/delete aRFS rules in HW
 * @vsi: the VSI to be forwarded to
 * @idx: index into the table of aRFS filter lists. Obtained from skb->hash
 * @add_list: list to populate with filters to be added to Flow Director
 * @del_list: list to populate with filters to be deleted from Flow Director
 *
 * Iterate over the hlist at the index given in the aRFS hash table and
 * determine if there are any aRFS entries that need to be either added or
 * deleted in the HW. If the aRFS entry is marked as ICE_ARFS_INACTIVE the
 * filter needs to be added to HW, else if it's marked as ICE_ARFS_ACTIVE and
 * the flow has expired delete the filter from HW. The caller of this function
 * is expected to add/delete rules on the add_list/del_list respectively.
 */
static void
ice_arfs_update_flow_rules(struct ice_vsi *vsi, u16 idx,
                           struct hlist_head *add_list,
                           struct hlist_head *del_list)
{
        struct ice_arfs_entry *e;
        struct hlist_node *n;
        struct device *dev;

        dev = ice_pf_to_dev(vsi->back);

        /* go through the aRFS hlist at this idx and check for needed updates */
        hlist_for_each_entry_safe(e, n, &vsi->arfs_fltr_list[idx], list_entry)
                /* check if filter needs to be added to HW */
                if (e->fltr_state == ICE_ARFS_INACTIVE) {
                        enum ice_fltr_ptype flow_type = e->fltr_info.flow_type;
                        struct ice_arfs_entry_ptr *ep =
                                devm_kzalloc(dev, sizeof(*ep), GFP_ATOMIC);

                        if (!ep)
                                continue;
                        INIT_HLIST_NODE(&ep->list_entry);
                        /* reference aRFS entry to add HW filter */
                        ep->arfs_entry = e;
                        hlist_add_head(&ep->list_entry, add_list);
                        e->fltr_state = ICE_ARFS_ACTIVE;
                        /* expiration timer only used for UDP flows */
                        if (flow_type == ICE_FLTR_PTYPE_NONF_IPV4_UDP ||
                            flow_type == ICE_FLTR_PTYPE_NONF_IPV6_UDP)
                                e->time_activated = get_jiffies_64();
                } else if (e->fltr_state == ICE_ARFS_ACTIVE) {
                        /* check if filter needs to be removed from HW */
                        if (ice_arfs_is_flow_expired(vsi, e)) {
                                /* remove aRFS entry from hash table for delete
                                 * and to prevent referencing it the next time
                                 * through this hlist index
                                 */
                                hlist_del(&e->list_entry);
                                e->fltr_state = ICE_ARFS_TODEL;
                                /* save reference to aRFS entry for delete */
                                hlist_add_head(&e->list_entry, del_list);
                        }
                }
}

/**
 * ice_sync_arfs_fltrs - update all aRFS filters
 * @pf: board private structure
 */
void ice_sync_arfs_fltrs(struct ice_pf *pf)
{
        HLIST_HEAD(tmp_del_list);
        HLIST_HEAD(tmp_add_list);
        struct ice_vsi *pf_vsi;
        unsigned int i;

        pf_vsi = ice_get_main_vsi(pf);
        if (!pf_vsi)
                return;

        if (!ice_is_arfs_active(pf_vsi))
                return;

        spin_lock_bh(&pf_vsi->arfs_lock);
        /* Once we process aRFS for the PF VSI get out */
        for (i = 0; i < ICE_MAX_ARFS_LIST; i++)
                ice_arfs_update_flow_rules(pf_vsi, i, &tmp_add_list,
                                           &tmp_del_list);
        spin_unlock_bh(&pf_vsi->arfs_lock);

        /* use list of ice_arfs_entry(s) for delete */
        ice_arfs_del_flow_rules(pf_vsi, &tmp_del_list);

        /* use list of ice_arfs_entry_ptr(s) for add */
        ice_arfs_add_flow_rules(pf_vsi, &tmp_add_list);
}

/**
 * ice_arfs_build_entry - builds an aRFS entry based on input
 * @vsi: destination VSI for this flow
 * @fk: flow dissector keys for creating the tuple
 * @rxq_idx: Rx queue to steer this flow to
 * @flow_id: passed down from the stack and saved for flow expiration
 *
 * returns an aRFS entry on success and NULL on failure
 */
static struct ice_arfs_entry *
ice_arfs_build_entry(struct ice_vsi *vsi, const struct flow_keys *fk,
                     u16 rxq_idx, u32 flow_id)
{
        struct ice_arfs_entry *arfs_entry;
        struct ice_fdir_fltr *fltr_info;
        u8 ip_proto;

        arfs_entry = devm_kzalloc(ice_pf_to_dev(vsi->back),
                                  sizeof(*arfs_entry),
                                  GFP_ATOMIC | __GFP_NOWARN);
        if (!arfs_entry)
                return NULL;

        fltr_info = &arfs_entry->fltr_info;
        fltr_info->q_index = rxq_idx;
        fltr_info->dest_ctl = ICE_FLTR_PRGM_DESC_DEST_DIRECT_PKT_QINDEX;
        fltr_info->dest_vsi = vsi->idx;
        ip_proto = fk->basic.ip_proto;

        if (fk->basic.n_proto == htons(ETH_P_IP)) {
                fltr_info->ip.v4.proto = ip_proto;
                fltr_info->flow_type = (ip_proto == IPPROTO_TCP) ?
                        ICE_FLTR_PTYPE_NONF_IPV4_TCP :
                        ICE_FLTR_PTYPE_NONF_IPV4_UDP;
                fltr_info->ip.v4.src_ip = fk->addrs.v4addrs.src;
                fltr_info->ip.v4.dst_ip = fk->addrs.v4addrs.dst;
                fltr_info->ip.v4.src_port = fk->ports.src;
                fltr_info->ip.v4.dst_port = fk->ports.dst;
        } else { /* ETH_P_IPV6 */
                fltr_info->ip.v6.proto = ip_proto;
                fltr_info->flow_type = (ip_proto == IPPROTO_TCP) ?
                        ICE_FLTR_PTYPE_NONF_IPV6_TCP :
                        ICE_FLTR_PTYPE_NONF_IPV6_UDP;
                memcpy(&fltr_info->ip.v6.src_ip, &fk->addrs.v6addrs.src,
                       sizeof(struct in6_addr));
                memcpy(&fltr_info->ip.v6.dst_ip, &fk->addrs.v6addrs.dst,
                       sizeof(struct in6_addr));
                fltr_info->ip.v6.src_port = fk->ports.src;
                fltr_info->ip.v6.dst_port = fk->ports.dst;
        }

        arfs_entry->flow_id = flow_id;
        fltr_info->fltr_id =
                atomic_inc_return(vsi->arfs_last_fltr_id) % RPS_NO_FILTER;

        return arfs_entry;
}

/**
 * ice_arfs_is_perfect_flow_set - Check to see if perfect flow is set
 * @hw: pointer to HW structure
 * @l3_proto: ETH_P_IP or ETH_P_IPV6 in network order
 * @l4_proto: IPPROTO_UDP or IPPROTO_TCP
 *
 * We only support perfect (4-tuple) filters for aRFS. This function allows aRFS
 * to check if perfect (4-tuple) flow rules are currently in place by Flow
 * Director.
 */
static bool
ice_arfs_is_perfect_flow_set(struct ice_hw *hw, __be16 l3_proto, u8 l4_proto)
{
        unsigned long *perfect_fltr = hw->fdir_perfect_fltr;

        /* advanced Flow Director disabled, perfect filters always supported */
        if (!perfect_fltr)
                return true;

        if (l3_proto == htons(ETH_P_IP) && l4_proto == IPPROTO_UDP)
                return test_bit(ICE_FLTR_PTYPE_NONF_IPV4_UDP, perfect_fltr);
        else if (l3_proto == htons(ETH_P_IP) && l4_proto == IPPROTO_TCP)
                return test_bit(ICE_FLTR_PTYPE_NONF_IPV4_TCP, perfect_fltr);
        else if (l3_proto == htons(ETH_P_IPV6) && l4_proto == IPPROTO_UDP)
                return test_bit(ICE_FLTR_PTYPE_NONF_IPV6_UDP, perfect_fltr);
        else if (l3_proto == htons(ETH_P_IPV6) && l4_proto == IPPROTO_TCP)
                return test_bit(ICE_FLTR_PTYPE_NONF_IPV6_TCP, perfect_fltr);

        return false;
}

/**
 * ice_arfs_cmp - Check if aRFS filter matches this flow.
 * @fltr_info: filter info of the saved ARFS entry.
 * @fk: flow dissector keys.
 * @n_proto:  One of htons(ETH_P_IP) or htons(ETH_P_IPV6).
 * @ip_proto: One of IPPROTO_TCP or IPPROTO_UDP.
 *
 * Since this function assumes limited values for n_proto and ip_proto, it
 * is meant to be called only from ice_rx_flow_steer().
 *
 * Return:
 * * true       - fltr_info refers to the same flow as fk.
 * * false      - fltr_info and fk refer to different flows.
 */
static bool
ice_arfs_cmp(const struct ice_fdir_fltr *fltr_info, const struct flow_keys *fk,
             __be16 n_proto, u8 ip_proto)
{
        /* Determine if the filter is for IPv4 or IPv6 based on flow_type,
         * which is one of ICE_FLTR_PTYPE_NONF_IPV{4,6}_{TCP,UDP}.
         */
        bool is_v4 = fltr_info->flow_type == ICE_FLTR_PTYPE_NONF_IPV4_TCP ||
                     fltr_info->flow_type == ICE_FLTR_PTYPE_NONF_IPV4_UDP;

        /* Following checks are arranged in the quickest and most discriminative
         * fields first for early failure.
         */
        if (is_v4)
                return n_proto == htons(ETH_P_IP) &&
                        fltr_info->ip.v4.src_port == fk->ports.src &&
                        fltr_info->ip.v4.dst_port == fk->ports.dst &&
                        fltr_info->ip.v4.src_ip == fk->addrs.v4addrs.src &&
                        fltr_info->ip.v4.dst_ip == fk->addrs.v4addrs.dst &&
                        fltr_info->ip.v4.proto == ip_proto;

        return fltr_info->ip.v6.src_port == fk->ports.src &&
                fltr_info->ip.v6.dst_port == fk->ports.dst &&
                fltr_info->ip.v6.proto == ip_proto &&
                !memcmp(&fltr_info->ip.v6.src_ip, &fk->addrs.v6addrs.src,
                        sizeof(struct in6_addr)) &&
                !memcmp(&fltr_info->ip.v6.dst_ip, &fk->addrs.v6addrs.dst,
                        sizeof(struct in6_addr));
}

/**
 * ice_rx_flow_steer - steer the Rx flow to where application is being run
 * @netdev: ptr to the netdev being adjusted
 * @skb: buffer with required header information
 * @rxq_idx: queue to which the flow needs to move
 * @flow_id: flow identifier provided by the netdev
 *
 * Based on the skb, rxq_idx, and flow_id passed in add/update an entry in the
 * aRFS hash table. Iterate over one of the hlists in the aRFS hash table and
 * if the flow_id already exists in the hash table but the rxq_idx has changed
 * mark the entry as ICE_ARFS_INACTIVE so it can get updated in HW, else
 * if the entry is marked as ICE_ARFS_TODEL delete it from the aRFS hash table.
 * If neither of the previous conditions are true then add a new entry in the
 * aRFS hash table, which gets set to ICE_ARFS_INACTIVE by default so it can be
 * added to HW.
 */
int
ice_rx_flow_steer(struct net_device *netdev, const struct sk_buff *skb,
                  u16 rxq_idx, u32 flow_id)
{
        struct ice_netdev_priv *np = netdev_priv(netdev);
        struct ice_arfs_entry *arfs_entry;
        struct ice_vsi *vsi = np->vsi;
        struct flow_keys fk;
        struct ice_pf *pf;
        __be16 n_proto;
        u8 ip_proto;
        u16 idx;
        int ret;

        /* failed to allocate memory for aRFS so don't crash */
        if (unlikely(!vsi->arfs_fltr_list))
                return -ENODEV;

        pf = vsi->back;

        if (skb->encapsulation)
                return -EPROTONOSUPPORT;

        if (!skb_flow_dissect_flow_keys(skb, &fk, 0))
                return -EPROTONOSUPPORT;

        n_proto = fk.basic.n_proto;
        /* Support only IPV4 and IPV6 */
        if ((n_proto == htons(ETH_P_IP) && !ip_is_fragment(ip_hdr(skb))) ||
            n_proto == htons(ETH_P_IPV6))
                ip_proto = fk.basic.ip_proto;
        else
                return -EPROTONOSUPPORT;

        /* Support only TCP and UDP */
        if (ip_proto != IPPROTO_TCP && ip_proto != IPPROTO_UDP)
                return -EPROTONOSUPPORT;

        /* only support 4-tuple filters for aRFS */
        if (!ice_arfs_is_perfect_flow_set(&pf->hw, n_proto, ip_proto))
                return -EOPNOTSUPP;

        /* choose the aRFS list bucket based on skb hash */
        idx = skb_get_hash_raw(skb) & ICE_ARFS_LST_MASK;
        /* search for entry in the bucket */
        spin_lock_bh(&vsi->arfs_lock);
        hlist_for_each_entry(arfs_entry, &vsi->arfs_fltr_list[idx],
                             list_entry) {
                struct ice_fdir_fltr *fltr_info;

                /* keep searching for the already existing arfs_entry flow */
                if (arfs_entry->flow_id != flow_id)
                        continue;

                fltr_info = &arfs_entry->fltr_info;

                if (!ice_arfs_cmp(fltr_info, &fk, n_proto, ip_proto))
                        continue;

                ret = fltr_info->fltr_id;

                if (fltr_info->q_index == rxq_idx ||
                    arfs_entry->fltr_state != ICE_ARFS_ACTIVE)
                        goto out;

                /* update the queue to forward to on an already existing flow */
                fltr_info->q_index = rxq_idx;
                arfs_entry->fltr_state = ICE_ARFS_INACTIVE;
                ice_arfs_update_active_fltr_cntrs(vsi, arfs_entry, false);
                goto out_schedule_service_task;
        }

        arfs_entry = ice_arfs_build_entry(vsi, &fk, rxq_idx, flow_id);
        if (!arfs_entry) {
                ret = -ENOMEM;
                goto out;
        }

        ret = arfs_entry->fltr_info.fltr_id;
        INIT_HLIST_NODE(&arfs_entry->list_entry);
        hlist_add_head(&arfs_entry->list_entry, &vsi->arfs_fltr_list[idx]);
out_schedule_service_task:
        ice_service_task_schedule(pf);
out:
        spin_unlock_bh(&vsi->arfs_lock);
        return ret;
}

/**
 * ice_init_arfs_cntrs - initialize aRFS counter values
 * @vsi: VSI that aRFS counters need to be initialized on
 */
static int ice_init_arfs_cntrs(struct ice_vsi *vsi)
{
        if (!vsi || vsi->type != ICE_VSI_PF)
                return -EINVAL;

        vsi->arfs_fltr_cntrs = kzalloc_obj(*vsi->arfs_fltr_cntrs);
        if (!vsi->arfs_fltr_cntrs)
                return -ENOMEM;

        vsi->arfs_last_fltr_id = kzalloc_obj(*vsi->arfs_last_fltr_id);
        if (!vsi->arfs_last_fltr_id) {
                kfree(vsi->arfs_fltr_cntrs);
                vsi->arfs_fltr_cntrs = NULL;
                return -ENOMEM;
        }

        return 0;
}

/**
 * ice_init_arfs - initialize aRFS resources
 * @vsi: the VSI to be forwarded to
 */
void ice_init_arfs(struct ice_vsi *vsi)
{
        struct hlist_head *arfs_fltr_list;
        unsigned int i;

        if (!vsi || vsi->type != ICE_VSI_PF || ice_is_arfs_active(vsi))
                return;

        arfs_fltr_list = kzalloc_objs(*arfs_fltr_list, ICE_MAX_ARFS_LIST);
        if (!arfs_fltr_list)
                return;

        if (ice_init_arfs_cntrs(vsi))
                goto free_arfs_fltr_list;

        for (i = 0; i < ICE_MAX_ARFS_LIST; i++)
                INIT_HLIST_HEAD(&arfs_fltr_list[i]);

        spin_lock_init(&vsi->arfs_lock);

        vsi->arfs_fltr_list = arfs_fltr_list;

        return;

free_arfs_fltr_list:
        kfree(arfs_fltr_list);
}

/**
 * ice_clear_arfs - clear the aRFS hash table and any memory used for aRFS
 * @vsi: the VSI to be forwarded to
 */
void ice_clear_arfs(struct ice_vsi *vsi)
{
        struct device *dev;
        unsigned int i;

        if (!vsi || vsi->type != ICE_VSI_PF || !vsi->back ||
            !vsi->arfs_fltr_list)
                return;

        dev = ice_pf_to_dev(vsi->back);
        for (i = 0; i < ICE_MAX_ARFS_LIST; i++) {
                struct ice_arfs_entry *r;
                struct hlist_node *n;

                spin_lock_bh(&vsi->arfs_lock);
                hlist_for_each_entry_safe(r, n, &vsi->arfs_fltr_list[i],
                                          list_entry) {
                        hlist_del(&r->list_entry);
                        devm_kfree(dev, r);
                }
                spin_unlock_bh(&vsi->arfs_lock);
        }

        kfree(vsi->arfs_fltr_list);
        vsi->arfs_fltr_list = NULL;
        kfree(vsi->arfs_last_fltr_id);
        vsi->arfs_last_fltr_id = NULL;
        kfree(vsi->arfs_fltr_cntrs);
        vsi->arfs_fltr_cntrs = NULL;
}

/**
 * ice_set_cpu_rx_rmap - setup CPU reverse map for each queue
 * @vsi: the VSI to be forwarded to
 */
int ice_set_cpu_rx_rmap(struct ice_vsi *vsi)
{
        struct net_device *netdev;
        struct ice_pf *pf;

        if (!vsi || vsi->type != ICE_VSI_PF)
                return 0;

        pf = vsi->back;
        netdev = vsi->netdev;
        if (!pf || !netdev || !vsi->num_q_vectors)
                return -EINVAL;

        netdev_dbg(netdev, "Setup CPU RMAP: vsi type 0x%x, ifname %s, q_vectors %d\n",
                   vsi->type, netdev->name, vsi->num_q_vectors);

        return netif_enable_cpu_rmap(netdev, vsi->num_q_vectors);
}

/**
 * ice_remove_arfs - remove/clear all aRFS resources
 * @pf: device private structure
 */
void ice_remove_arfs(struct ice_pf *pf)
{
        struct ice_vsi *pf_vsi;

        pf_vsi = ice_get_main_vsi(pf);
        if (!pf_vsi)
                return;

        ice_clear_arfs(pf_vsi);
}

/**
 * ice_rebuild_arfs - remove/clear all aRFS resources and rebuild after reset
 * @pf: device private structure
 */
void ice_rebuild_arfs(struct ice_pf *pf)
{
        struct ice_vsi *pf_vsi;

        pf_vsi = ice_get_main_vsi(pf);
        if (!pf_vsi)
                return;

        ice_remove_arfs(pf);
        ice_init_arfs(pf_vsi);
}