/*

   * drivers/net/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 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,
  };
  
  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");