drivers/net/team/team_mode_random.c

   1 /*
   2  * drivers/net/team/team_mode_random.c - Random mode for team
   3  * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us>
   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/skbuff.h>
  16 #include <linux/if_team.h>
  17
  18 static bool rnd_transmit(struct team *team, struct sk_buff *skb)
  19 {
  20         struct team_port *port;
  21         int port_index;
  22
  23         port_index = prandom_u32_max(team->en_port_count);
  24         port = team_get_port_by_index_rcu(team, port_index);
  25         if (unlikely(!port))
  26                 goto drop;
  27         port = team_get_first_port_txable_rcu(team, port);
  28         if (unlikely(!port))
  29                 goto drop;
  30         if (team_dev_queue_xmit(team, port, skb))
  31                 return false;
  32         return true;
  33
  34 drop:
  35         dev_kfree_skb_any(skb);
  36         return false;
  37 }
  38
  39 static const struct team_mode_ops rnd_mode_ops = {
  40         .transmit               = rnd_transmit,
  41         .port_enter             = team_modeop_port_enter,
  42         .port_change_dev_addr   = team_modeop_port_change_dev_addr,
  43 };
  44
  45 static const struct team_mode rnd_mode = {
  46         .kind           = "random",
  47         .owner          = THIS_MODULE,
  48         .ops            = &rnd_mode_ops,
  49         .lag_tx_type    = NETDEV_LAG_TX_TYPE_RANDOM,
  50 };
  51
  52 static int __init rnd_init_module(void)
  53 {
  54         return team_mode_register(&rnd_mode);
  55 }
  56
  57 static void __exit rnd_cleanup_module(void)
  58 {
  59         team_mode_unregister(&rnd_mode);
  60 }
  61
  62 module_init(rnd_init_module);
  63 module_exit(rnd_cleanup_module);
  64
  65 MODULE_LICENSE("GPL v2");
  66 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
  67 MODULE_DESCRIPTION("Random mode for team");
  68 MODULE_ALIAS_TEAM_MODE("random");