drivers/net/team/team_mode_roundrobin.c

   1 /*
   2  * drivers/net/team/team_mode_roundrobin.c - Round-robin mode for team
   3  * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/errno.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/if_team.h>
  18
  19 struct rr_priv {
  20         unsigned int sent_packets;
  21 };
  22
  23 static struct rr_priv *rr_priv(struct team *team)
  24 {
  25         return (struct rr_priv *) &team->mode_priv;
  26 }
  27
  28 static bool rr_transmit(struct team *team, struct sk_buff *skb)
  29 {
  30         struct team_port *port;
  31         int port_index;
  32
  33         port_index = team_num_to_port_index(team,
  34                                             rr_priv(team)->sent_packets++);
  35         port = team_get_port_by_index_rcu(team, port_index);
  36         if (unlikely(!port))
  37                 goto drop;
  38         port = team_get_first_port_txable_rcu(team, port);
  39         if (unlikely(!port))
  40                 goto drop;
  41         if (team_dev_queue_xmit(team, port, skb))
  42                 return false;
  43         return true;
  44
  45 drop:
  46         dev_kfree_skb_any(skb);
  47         return false;
  48 }
  49
  50 static const struct team_mode_ops rr_mode_ops = {
  51         .transmit               = rr_transmit,
  52         .port_enter             = team_modeop_port_enter,
  53         .port_change_dev_addr   = team_modeop_port_change_dev_addr,
  54 };
  55
  56 static const struct team_mode rr_mode = {
  57         .kind           = "roundrobin",
  58         .owner          = THIS_MODULE,
  59         .priv_size      = sizeof(struct rr_priv),
  60         .ops            = &rr_mode_ops,
  61 };
  62
  63 static int __init rr_init_module(void)
  64 {
  65         return team_mode_register(&rr_mode);
  66 }
  67
  68 static void __exit rr_cleanup_module(void)
  69 {
  70         team_mode_unregister(&rr_mode);
  71 }
  72
  73 module_init(rr_init_module);
  74 module_exit(rr_cleanup_module);
  75
  76 MODULE_LICENSE("GPL v2");
  77 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
  78 MODULE_DESCRIPTION("Round-robin mode for team");
  79 MODULE_ALIAS("team-mode-roundrobin");