// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved. */

#include <net/pkt_cls.h>
#include "htb.h"
#include "en.h"
#include "../qos.h"

struct mlx5e_qos_node {
        struct hlist_node hnode;
        struct mlx5e_qos_node *parent;
        u64 rate;
        u32 bw_share;
        u32 max_average_bw;
        u32 hw_id;
        u32 classid; /* 16-bit, except root. */
        u16 qid;
};

struct mlx5e_htb {
        DECLARE_HASHTABLE(qos_tc2node, order_base_2(MLX5E_QOS_MAX_LEAF_NODES));
        DECLARE_BITMAP(qos_used_qids, MLX5E_QOS_MAX_LEAF_NODES);
        struct mlx5_core_dev *mdev;
        struct net_device *netdev;
        struct mlx5e_priv *priv;
        struct mlx5e_selq *selq;
};

#define MLX5E_QOS_QID_INNER 0xffff
#define MLX5E_HTB_CLASSID_ROOT 0xffffffff

/* Software representation of the QoS tree */

int mlx5e_htb_enumerate_leaves(struct mlx5e_htb *htb, mlx5e_fp_htb_enumerate callback, void *data)
{
        struct mlx5e_qos_node *node = NULL;
        int bkt, err;

        hash_for_each(htb->qos_tc2node, bkt, node, hnode) {
                if (node->qid == MLX5E_QOS_QID_INNER)
                        continue;
                err = callback(data, node->qid, node->hw_id);
                if (err)
                        return err;
        }
        return 0;
}

int mlx5e_htb_cur_leaf_nodes(struct mlx5e_htb *htb)
{
        int last;

        last = find_last_bit(htb->qos_used_qids, mlx5e_qos_max_leaf_nodes(htb->mdev));
        return last == mlx5e_qos_max_leaf_nodes(htb->mdev) ? 0 : last + 1;
}

static int mlx5e_htb_find_unused_qos_qid(struct mlx5e_htb *htb)
{
        int size = mlx5e_qos_max_leaf_nodes(htb->mdev);
        struct mlx5e_priv *priv = htb->priv;
        int res;

        WARN_ONCE(!mutex_is_locked(&priv->state_lock), "%s: state_lock is not held\n", __func__);
        res = find_first_zero_bit(htb->qos_used_qids, size);

        return res == size ? -ENOSPC : res;
}

static struct mlx5e_qos_node *
mlx5e_htb_node_create_leaf(struct mlx5e_htb *htb, u16 classid, u16 qid,
                           struct mlx5e_qos_node *parent)
{
        struct mlx5e_qos_node *node;

        node = kzalloc_obj(*node);
        if (!node)
                return ERR_PTR(-ENOMEM);

        node->parent = parent;

        node->qid = qid;
        __set_bit(qid, htb->qos_used_qids);

        node->classid = classid;
        hash_add_rcu(htb->qos_tc2node, &node->hnode, classid);

        mlx5e_update_tx_netdev_queues(htb->priv);

        return node;
}

static struct mlx5e_qos_node *mlx5e_htb_node_create_root(struct mlx5e_htb *htb)
{
        struct mlx5e_qos_node *node;

        node = kzalloc_obj(*node);
        if (!node)
                return ERR_PTR(-ENOMEM);

        node->qid = MLX5E_QOS_QID_INNER;
        node->classid = MLX5E_HTB_CLASSID_ROOT;
        hash_add_rcu(htb->qos_tc2node, &node->hnode, node->classid);

        return node;
}

static struct mlx5e_qos_node *mlx5e_htb_node_find(struct mlx5e_htb *htb, u32 classid)
{
        struct mlx5e_qos_node *node = NULL;

        hash_for_each_possible(htb->qos_tc2node, node, hnode, classid) {
                if (node->classid == classid)
                        break;
        }

        return node;
}

static struct mlx5e_qos_node *mlx5e_htb_node_find_rcu(struct mlx5e_htb *htb, u32 classid)
{
        struct mlx5e_qos_node *node = NULL;

        hash_for_each_possible_rcu(htb->qos_tc2node, node, hnode, classid) {
                if (node->classid == classid)
                        break;
        }

        return node;
}

static void mlx5e_htb_node_delete(struct mlx5e_htb *htb, struct mlx5e_qos_node *node)
{
        hash_del_rcu(&node->hnode);
        if (node->qid != MLX5E_QOS_QID_INNER) {
                __clear_bit(node->qid, htb->qos_used_qids);
                mlx5e_update_tx_netdev_queues(htb->priv);
        }
        /* Make sure this qid is no longer selected by mlx5e_select_queue, so
         * that mlx5e_reactivate_qos_sq can safely restart the netdev TX queue.
         */
        synchronize_net();
        kfree(node);
}

/* TX datapath API */

int mlx5e_htb_get_txq_by_classid(struct mlx5e_htb *htb, u16 classid)
{
        struct mlx5e_qos_node *node;
        u16 qid;
        int res;

        rcu_read_lock();

        node = mlx5e_htb_node_find_rcu(htb, classid);
        if (!node) {
                res = -ENOENT;
                goto out;
        }
        qid = READ_ONCE(node->qid);
        if (qid == MLX5E_QOS_QID_INNER) {
                res = -EINVAL;
                goto out;
        }
        res = mlx5e_qid_from_qos(&htb->priv->channels, qid);

out:
        rcu_read_unlock();
        return res;
}

/* HTB TC handlers */

static int
mlx5e_htb_root_add(struct mlx5e_htb *htb, u16 htb_maj_id, u16 htb_defcls,
                   struct netlink_ext_ack *extack)
{
        struct mlx5e_priv *priv = htb->priv;
        struct mlx5e_qos_node *root;
        bool opened;
        int err;

        qos_dbg(htb->mdev, "TC_HTB_CREATE handle %04x:, default :%04x\n", htb_maj_id, htb_defcls);

        mlx5e_selq_prepare_htb(htb->selq, htb_maj_id, htb_defcls);

        opened = test_bit(MLX5E_STATE_OPENED, &priv->state);
        if (opened) {
                err = mlx5e_qos_alloc_queues(priv, &priv->channels);
                if (err)
                        goto err_cancel_selq;
        }

        root = mlx5e_htb_node_create_root(htb);
        if (IS_ERR(root)) {
                err = PTR_ERR(root);
                goto err_free_queues;
        }

        err = mlx5_qos_create_root_node(htb->mdev, &root->hw_id);
        if (err) {
                NL_SET_ERR_MSG_MOD(extack, "Firmware error. Try upgrading firmware.");
                goto err_sw_node_delete;
        }

        mlx5e_selq_apply(htb->selq);

        return 0;

err_sw_node_delete:
        mlx5e_htb_node_delete(htb, root);

err_free_queues:
        if (opened)
                mlx5e_qos_close_all_queues(&priv->channels);
err_cancel_selq:
        mlx5e_selq_cancel(htb->selq);
        return err;
}

static int mlx5e_htb_root_del(struct mlx5e_htb *htb)
{
        struct mlx5e_priv *priv = htb->priv;
        struct mlx5e_qos_node *root;
        int err;

        qos_dbg(htb->mdev, "TC_HTB_DESTROY\n");

        /* Wait until real_num_tx_queues is updated for mlx5e_select_queue,
         * so that we can safely switch to its non-HTB non-PTP fastpath.
         */
        synchronize_net();

        mlx5e_selq_prepare_htb(htb->selq, 0, 0);
        mlx5e_selq_apply(htb->selq);

        root = mlx5e_htb_node_find(htb, MLX5E_HTB_CLASSID_ROOT);
        if (!root) {
                qos_err(htb->mdev, "Failed to find the root node in the QoS tree\n");
                return -ENOENT;
        }
        err = mlx5_qos_destroy_node(htb->mdev, root->hw_id);
        if (err)
                qos_err(htb->mdev, "Failed to destroy root node %u, err = %d\n",
                        root->hw_id, err);
        mlx5e_htb_node_delete(htb, root);

        mlx5e_qos_deactivate_all_queues(&priv->channels);
        mlx5e_qos_close_all_queues(&priv->channels);

        return err;
}

static int mlx5e_htb_convert_rate(struct mlx5e_htb *htb, u64 rate,
                                  struct mlx5e_qos_node *parent, u32 *bw_share)
{
        u64 share = 0;

        while (parent->classid != MLX5E_HTB_CLASSID_ROOT && !parent->max_average_bw)
                parent = parent->parent;

        if (parent->max_average_bw)
                share = div64_u64(div_u64(rate * 100, BYTES_IN_MBIT),
                                  parent->max_average_bw);
        else
                share = 101;

        *bw_share = share == 0 ? 1 : share > 100 ? 0 : share;

        qos_dbg(htb->mdev, "Convert: rate %llu, parent ceil %llu -> bw_share %u\n",
                rate, (u64)parent->max_average_bw * BYTES_IN_MBIT, *bw_share);

        return 0;
}

static void mlx5e_htb_convert_ceil(struct mlx5e_htb *htb, u64 ceil, u32 *max_average_bw)
{
        /* Hardware treats 0 as "unlimited", set at least 1. */
        *max_average_bw = max_t(u32, div_u64(ceil, BYTES_IN_MBIT), 1);

        qos_dbg(htb->mdev, "Convert: ceil %llu -> max_average_bw %u\n",
                ceil, *max_average_bw);
}

int
mlx5e_htb_leaf_alloc_queue(struct mlx5e_htb *htb, u16 classid,
                           u32 parent_classid, u64 rate, u64 ceil,
                           struct netlink_ext_ack *extack)
{
        struct mlx5e_qos_node *node, *parent;
        struct mlx5e_priv *priv = htb->priv;
        int qid;
        int err;

        qos_dbg(htb->mdev, "TC_HTB_LEAF_ALLOC_QUEUE classid %04x, parent %04x, rate %llu, ceil %llu\n",
                classid, parent_classid, rate, ceil);

        qid = mlx5e_htb_find_unused_qos_qid(htb);
        if (qid < 0) {
                NL_SET_ERR_MSG_MOD(extack, "Maximum amount of leaf classes is reached.");
                return qid;
        }

        parent = mlx5e_htb_node_find(htb, parent_classid);
        if (!parent)
                return -EINVAL;

        node = mlx5e_htb_node_create_leaf(htb, classid, qid, parent);
        if (IS_ERR(node))
                return PTR_ERR(node);

        node->rate = rate;
        mlx5e_htb_convert_rate(htb, rate, node->parent, &node->bw_share);
        mlx5e_htb_convert_ceil(htb, ceil, &node->max_average_bw);

        err = mlx5_qos_create_leaf_node(htb->mdev, node->parent->hw_id,
                                        node->bw_share, node->max_average_bw,
                                        &node->hw_id);
        if (err) {
                NL_SET_ERR_MSG_MOD(extack, "Firmware error when creating a leaf node.");
                qos_err(htb->mdev, "Failed to create a leaf node (class %04x), err = %d\n",
                        classid, err);
                mlx5e_htb_node_delete(htb, node);
                return err;
        }

        if (test_bit(MLX5E_STATE_OPENED, &priv->state)) {
                err = mlx5e_open_qos_sq(priv, &priv->channels, node->qid, node->hw_id);
                if (err) {
                        NL_SET_ERR_MSG_MOD(extack, "Error creating an SQ.");
                        qos_warn(htb->mdev, "Failed to create a QoS SQ (class %04x), err = %d\n",
                                 classid, err);
                } else {
                        mlx5e_activate_qos_sq(priv, node->qid, node->hw_id);
                }
        }

        return mlx5e_qid_from_qos(&priv->channels, node->qid);
}

int
mlx5e_htb_leaf_to_inner(struct mlx5e_htb *htb, u16 classid, u16 child_classid,
                        u64 rate, u64 ceil, struct netlink_ext_ack *extack)
{
        struct mlx5e_qos_node *node, *child;
        struct mlx5e_priv *priv = htb->priv;
        int err, tmp_err;
        u32 new_hw_id;
        u16 qid;

        qos_dbg(htb->mdev, "TC_HTB_LEAF_TO_INNER classid %04x, upcoming child %04x, rate %llu, ceil %llu\n",
                classid, child_classid, rate, ceil);

        node = mlx5e_htb_node_find(htb, classid);
        if (!node)
                return -ENOENT;

        err = mlx5_qos_create_inner_node(htb->mdev, node->parent->hw_id,
                                         node->bw_share, node->max_average_bw,
                                         &new_hw_id);
        if (err) {
                NL_SET_ERR_MSG_MOD(extack, "Firmware error when creating an inner node.");
                qos_err(htb->mdev, "Failed to create an inner node (class %04x), err = %d\n",
                        classid, err);
                return err;
        }

        /* Intentionally reuse the qid for the upcoming first child. */
        child = mlx5e_htb_node_create_leaf(htb, child_classid, node->qid, node);
        if (IS_ERR(child)) {
                err = PTR_ERR(child);
                goto err_destroy_hw_node;
        }

        child->rate = rate;
        mlx5e_htb_convert_rate(htb, rate, node, &child->bw_share);
        mlx5e_htb_convert_ceil(htb, ceil, &child->max_average_bw);

        err = mlx5_qos_create_leaf_node(htb->mdev, new_hw_id, child->bw_share,
                                        child->max_average_bw, &child->hw_id);
        if (err) {
                NL_SET_ERR_MSG_MOD(extack, "Firmware error when creating a leaf node.");
                qos_err(htb->mdev, "Failed to create a leaf node (class %04x), err = %d\n",
                        classid, err);
                goto err_delete_sw_node;
        }

        /* No fail point. */

        qid = node->qid;
        /* Pairs with mlx5e_htb_get_txq_by_classid. */
        WRITE_ONCE(node->qid, MLX5E_QOS_QID_INNER);

        if (test_bit(MLX5E_STATE_OPENED, &priv->state)) {
                mlx5e_deactivate_qos_sq(priv, qid);
                mlx5e_close_qos_sq(priv, qid);
        }

        err = mlx5_qos_destroy_node(htb->mdev, node->hw_id);
        if (err) /* Not fatal. */
                qos_warn(htb->mdev, "Failed to destroy leaf node %u (class %04x), err = %d\n",
                         node->hw_id, classid, err);

        node->hw_id = new_hw_id;

        if (test_bit(MLX5E_STATE_OPENED, &priv->state)) {
                err = mlx5e_open_qos_sq(priv, &priv->channels, child->qid, child->hw_id);
                if (err) {
                        NL_SET_ERR_MSG_MOD(extack, "Error creating an SQ.");
                        qos_warn(htb->mdev, "Failed to create a QoS SQ (class %04x), err = %d\n",
                                 classid, err);
                } else {
                        mlx5e_activate_qos_sq(priv, child->qid, child->hw_id);
                }
        }

        return 0;

err_delete_sw_node:
        child->qid = MLX5E_QOS_QID_INNER;
        mlx5e_htb_node_delete(htb, child);

err_destroy_hw_node:
        tmp_err = mlx5_qos_destroy_node(htb->mdev, new_hw_id);
        if (tmp_err) /* Not fatal. */
                qos_warn(htb->mdev, "Failed to roll back creation of an inner node %u (class %04x), err = %d\n",
                         new_hw_id, classid, tmp_err);
        return err;
}

static struct mlx5e_qos_node *mlx5e_htb_node_find_by_qid(struct mlx5e_htb *htb, u16 qid)
{
        struct mlx5e_qos_node *node = NULL;
        int bkt;

        hash_for_each(htb->qos_tc2node, bkt, node, hnode)
                if (node->qid == qid)
                        break;

        return node;
}

int mlx5e_htb_leaf_del(struct mlx5e_htb *htb, u16 *classid,
                       struct netlink_ext_ack *extack)
{
        struct mlx5e_priv *priv = htb->priv;
        struct mlx5e_qos_node *node;
        struct netdev_queue *txq;
        u16 qid, moved_qid;
        bool opened;
        int err;

        qos_dbg(htb->mdev, "TC_HTB_LEAF_DEL classid %04x\n", *classid);

        node = mlx5e_htb_node_find(htb, *classid);
        if (!node)
                return -ENOENT;

        /* Store qid for reuse. */
        qid = node->qid;

        opened = test_bit(MLX5E_STATE_OPENED, &priv->state);
        if (opened) {
                txq = netdev_get_tx_queue(htb->netdev,
                                          mlx5e_qid_from_qos(&priv->channels, qid));
                mlx5e_deactivate_qos_sq(priv, qid);
                mlx5e_close_qos_sq(priv, qid);
        }

        err = mlx5_qos_destroy_node(htb->mdev, node->hw_id);
        if (err) /* Not fatal. */
                qos_warn(htb->mdev, "Failed to destroy leaf node %u (class %04x), err = %d\n",
                         node->hw_id, *classid, err);

        mlx5e_htb_node_delete(htb, node);

        moved_qid = mlx5e_htb_cur_leaf_nodes(htb);

        if (moved_qid == 0) {
                /* The last QoS SQ was just destroyed. */
                if (opened)
                        mlx5e_reactivate_qos_sq(priv, qid, txq);
                return 0;
        }
        moved_qid--;

        if (moved_qid < qid) {
                /* The highest QoS SQ was just destroyed. */
                WARN(moved_qid != qid - 1, "Gaps in queue numeration: destroyed queue %u, the highest queue is %u",
                     qid, moved_qid);
                if (opened)
                        mlx5e_reactivate_qos_sq(priv, qid, txq);
                return 0;
        }

        WARN(moved_qid == qid, "Can't move node with qid %u to itself", qid);
        qos_dbg(htb->mdev, "Moving QoS SQ %u to %u\n", moved_qid, qid);

        node = mlx5e_htb_node_find_by_qid(htb, moved_qid);
        WARN(!node, "Could not find a node with qid %u to move to queue %u",
             moved_qid, qid);

        /* Stop traffic to the old queue. */
        WRITE_ONCE(node->qid, MLX5E_QOS_QID_INNER);
        __clear_bit(moved_qid, priv->htb->qos_used_qids);

        if (opened) {
                txq = netdev_get_tx_queue(htb->netdev,
                                          mlx5e_qid_from_qos(&priv->channels, moved_qid));
                mlx5e_deactivate_qos_sq(priv, moved_qid);
                mlx5e_close_qos_sq(priv, moved_qid);
        }

        /* Prevent packets from the old class from getting into the new one. */
        mlx5e_reset_qdisc(htb->netdev, moved_qid);

        __set_bit(qid, htb->qos_used_qids);
        WRITE_ONCE(node->qid, qid);

        if (test_bit(MLX5E_STATE_OPENED, &priv->state)) {
                err = mlx5e_open_qos_sq(priv, &priv->channels, node->qid, node->hw_id);
                if (err) {
                        NL_SET_ERR_MSG_MOD(extack, "Error creating an SQ.");
                        qos_warn(htb->mdev, "Failed to create a QoS SQ (class %04x) while moving qid %u to %u, err = %d\n",
                                 node->classid, moved_qid, qid, err);
                } else {
                        mlx5e_activate_qos_sq(priv, node->qid, node->hw_id);
                }
        }

        mlx5e_update_tx_netdev_queues(priv);
        if (opened)
                mlx5e_reactivate_qos_sq(priv, moved_qid, txq);

        *classid = node->classid;
        return 0;
}

int
mlx5e_htb_leaf_del_last(struct mlx5e_htb *htb, u16 classid, bool force,
                        struct netlink_ext_ack *extack)
{
        struct mlx5e_qos_node *node, *parent;
        struct mlx5e_priv *priv = htb->priv;
        u32 old_hw_id, new_hw_id;
        int err, saved_err = 0;
        u16 qid;

        qos_dbg(htb->mdev, "TC_HTB_LEAF_DEL_LAST%s classid %04x\n",
                force ? "_FORCE" : "", classid);

        node = mlx5e_htb_node_find(htb, classid);
        if (!node)
                return -ENOENT;

        err = mlx5_qos_create_leaf_node(htb->mdev, node->parent->parent->hw_id,
                                        node->parent->bw_share,
                                        node->parent->max_average_bw,
                                        &new_hw_id);
        if (err) {
                NL_SET_ERR_MSG_MOD(extack, "Firmware error when creating a leaf node.");
                qos_err(htb->mdev, "Failed to create a leaf node (class %04x), err = %d\n",
                        classid, err);
                if (!force)
                        return err;
                saved_err = err;
        }

        /* Store qid for reuse and prevent clearing the bit. */
        qid = node->qid;
        /* Pairs with mlx5e_htb_get_txq_by_classid. */
        WRITE_ONCE(node->qid, MLX5E_QOS_QID_INNER);

        if (test_bit(MLX5E_STATE_OPENED, &priv->state)) {
                mlx5e_deactivate_qos_sq(priv, qid);
                mlx5e_close_qos_sq(priv, qid);
        }

        /* Prevent packets from the old class from getting into the new one. */
        mlx5e_reset_qdisc(htb->netdev, qid);

        err = mlx5_qos_destroy_node(htb->mdev, node->hw_id);
        if (err) /* Not fatal. */
                qos_warn(htb->mdev, "Failed to destroy leaf node %u (class %04x), err = %d\n",
                         node->hw_id, classid, err);

        parent = node->parent;
        mlx5e_htb_node_delete(htb, node);

        node = parent;
        WRITE_ONCE(node->qid, qid);

        /* Early return on error in force mode. Parent will still be an inner
         * node to be deleted by a following delete operation.
         */
        if (saved_err)
                return saved_err;

        old_hw_id = node->hw_id;
        node->hw_id = new_hw_id;

        if (test_bit(MLX5E_STATE_OPENED, &priv->state)) {
                err = mlx5e_open_qos_sq(priv, &priv->channels, node->qid, node->hw_id);
                if (err) {
                        NL_SET_ERR_MSG_MOD(extack, "Error creating an SQ.");
                        qos_warn(htb->mdev, "Failed to create a QoS SQ (class %04x), err = %d\n",
                                 classid, err);
                } else {
                        mlx5e_activate_qos_sq(priv, node->qid, node->hw_id);
                }
        }

        err = mlx5_qos_destroy_node(htb->mdev, old_hw_id);
        if (err) /* Not fatal. */
                qos_warn(htb->mdev, "Failed to destroy leaf node %u (class %04x), err = %d\n",
                         node->hw_id, classid, err);

        return 0;
}

static int
mlx5e_htb_update_children(struct mlx5e_htb *htb, struct mlx5e_qos_node *node,
                          struct netlink_ext_ack *extack)
{
        struct mlx5e_qos_node *child;
        int err = 0;
        int bkt;

        hash_for_each(htb->qos_tc2node, bkt, child, hnode) {
                u32 old_bw_share = child->bw_share;
                int err_one;

                if (child->parent != node)
                        continue;

                mlx5e_htb_convert_rate(htb, child->rate, node, &child->bw_share);
                if (child->bw_share == old_bw_share)
                        continue;

                err_one = mlx5_qos_update_node(htb->mdev, child->bw_share,
                                               child->max_average_bw, child->hw_id);
                if (!err && err_one) {
                        err = err_one;

                        NL_SET_ERR_MSG_MOD(extack, "Firmware error when modifying a child node.");
                        qos_err(htb->mdev, "Failed to modify a child node (class %04x), err = %d\n",
                                node->classid, err);
                }
        }

        return err;
}

int
mlx5e_htb_node_modify(struct mlx5e_htb *htb, u16 classid, u64 rate, u64 ceil,
                      struct netlink_ext_ack *extack)
{
        u32 bw_share, max_average_bw;
        struct mlx5e_qos_node *node;
        bool ceil_changed = false;
        int err;

        qos_dbg(htb->mdev, "TC_HTB_LEAF_MODIFY classid %04x, rate %llu, ceil %llu\n",
                classid, rate, ceil);

        node = mlx5e_htb_node_find(htb, classid);
        if (!node)
                return -ENOENT;

        node->rate = rate;
        mlx5e_htb_convert_rate(htb, rate, node->parent, &bw_share);
        mlx5e_htb_convert_ceil(htb, ceil, &max_average_bw);

        err = mlx5_qos_update_node(htb->mdev, bw_share,
                                   max_average_bw, node->hw_id);
        if (err) {
                NL_SET_ERR_MSG_MOD(extack, "Firmware error when modifying a node.");
                qos_err(htb->mdev, "Failed to modify a node (class %04x), err = %d\n",
                        classid, err);
                return err;
        }

        if (max_average_bw != node->max_average_bw)
                ceil_changed = true;

        node->bw_share = bw_share;
        node->max_average_bw = max_average_bw;

        if (ceil_changed)
                err = mlx5e_htb_update_children(htb, node, extack);

        return err;
}

struct mlx5e_htb *mlx5e_htb_alloc(void)
{
        return kvzalloc_obj(struct mlx5e_htb);
}

void mlx5e_htb_free(struct mlx5e_htb *htb)
{
        kvfree(htb);
}

int mlx5e_htb_init(struct mlx5e_htb *htb, struct tc_htb_qopt_offload *htb_qopt,
                   struct net_device *netdev, struct mlx5_core_dev *mdev,
                   struct mlx5e_selq *selq, struct mlx5e_priv *priv)
{
        htb->mdev = mdev;
        htb->netdev = netdev;
        htb->selq = selq;
        htb->priv = priv;
        hash_init(htb->qos_tc2node);
        return mlx5e_htb_root_add(htb, htb_qopt->parent_classid, htb_qopt->classid,
                                  htb_qopt->extack);
}

void mlx5e_htb_cleanup(struct mlx5e_htb *htb)
{
        mlx5e_htb_root_del(htb);
}