// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * drivers/net/team/team_mode_roundrobin.c - Round-robin mode for team
 * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/if_team.h>

struct rr_priv {
        unsigned int sent_packets;
};

static struct rr_priv *rr_priv(struct team *team)
{
        return (struct rr_priv *) &team->mode_priv;
}

static bool rr_transmit(struct team *team, struct sk_buff *skb)
{
        struct team_port *port;
        int port_index;

        port_index = team_num_to_port_index(team,
                                            rr_priv(team)->sent_packets++);
        port = team_get_port_by_index_rcu(team, port_index);
        if (unlikely(!port))
                goto drop;
        port = team_get_first_port_txable_rcu(team, port);
        if (unlikely(!port))
                goto drop;
        if (team_dev_queue_xmit(team, port, skb))
                return false;
        return true;

drop:
        dev_kfree_skb_any(skb);
        return false;
}

static const struct team_mode_ops rr_mode_ops = {
        .transmit               = rr_transmit,
        .port_enter             = team_modeop_port_enter,
        .port_change_dev_addr   = team_modeop_port_change_dev_addr,
};

static const struct team_mode rr_mode = {
        .kind           = "roundrobin",
        .owner          = THIS_MODULE,
        .priv_size      = sizeof(struct rr_priv),
        .ops            = &rr_mode_ops,
        .lag_tx_type    = NETDEV_LAG_TX_TYPE_ROUNDROBIN,
};

static int __init rr_init_module(void)
{
        return team_mode_register(&rr_mode);
}

static void __exit rr_cleanup_module(void)
{
        team_mode_unregister(&rr_mode);
}

module_init(rr_init_module);
module_exit(rr_cleanup_module);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
MODULE_DESCRIPTION("Round-robin mode for team");
MODULE_ALIAS_TEAM_MODE("roundrobin");