team_mode_roundrobin.c

Go to the documentation of this file.

/*
 * drivers/net/team/team_mode_roundrobin.c - Round-robin mode for team
 * Copyright (c) 2011 Jiri Pirko <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.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 struct team_port *__get_first_port_up(struct team *team,
                         struct team_port *port)
{
    struct team_port *cur;

    if (team_port_txable(port))
        return port;
    cur = port;
    list_for_each_entry_continue_rcu(cur, &team->port_list, list)
        if (team_port_txable(port))
            return cur;
    list_for_each_entry_rcu(cur, &team->port_list, list) {
        if (cur == port)
            break;
        if (team_port_txable(port))
            return cur;
    }
    return NULL;
}

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

    port_index = rr_priv(team)->sent_packets++ % team->en_port_count;
    port = team_get_port_by_index_rcu(team, port_index);
    port = __get_first_port_up(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 int rr_port_enter(struct team *team, struct team_port *port)
{
    return team_port_set_team_dev_addr(port);
}

static void rr_port_change_dev_addr(struct team *team, struct team_port *port)
{
    team_port_set_team_dev_addr(port);
}

static const struct team_mode_ops rr_mode_ops = {
    .transmit       = rr_transmit,
    .port_enter     = rr_port_enter,
    .port_change_dev_addr   = rr_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,
};

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 <[email protected]>");
MODULE_DESCRIPTION("Round-robin mode for team");
MODULE_ALIAS("team-mode-roundrobin");