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/*
* net/drivers/team/team_mode_roundrobin.c - Round-robin mode for team
* Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
*
* 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 (port->linkup)
return port;
cur = port;
list_for_each_entry_continue_rcu(cur, &team->port_list, list)
if (cur->linkup)
return cur;
list_for_each_entry_rcu(cur, &team->port_list, list) {
if (cur == port)
break;
if (cur->linkup)
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->port_count;
port = team_get_port_by_index_rcu(team, port_index);
port = __get_first_port_up(team, port);
if (unlikely(!port))
goto drop;
skb->dev = port->dev;
if (dev_queue_xmit(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_mac(port);
}
static void rr_port_change_mac(struct team *team, struct team_port *port)
{
team_port_set_team_mac(port);
}
static const struct team_mode_ops rr_mode_ops = {
.transmit = rr_transmit,
.port_enter = rr_port_enter,
.port_change_mac = rr_port_change_mac,
};
static 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 <jpirko@redhat.com>");
MODULE_DESCRIPTION("Round-robin mode for team");
MODULE_ALIAS("team-mode-roundrobin");
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