drivers/net/team/team_mode_random.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers/net/team/team_mode_random.c - Random mode for team
   4  * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/types.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/if_team.h>
  13
  14 static bool rnd_transmit(struct team *team, struct sk_buff *skb)
  15 {
  16         struct team_port *port;
  17         int port_index;
  18
  19         port_index = prandom_u32_max(team->en_port_count);
  20         port = team_get_port_by_index_rcu(team, port_index);
  21         if (unlikely(!port))
  22                 goto drop;
  23         port = team_get_first_port_txable_rcu(team, port);
  24         if (unlikely(!port))
  25                 goto drop;
  26         if (team_dev_queue_xmit(team, port, skb))
  27                 return false;
  28         return true;
  29
  30 drop:
  31         dev_kfree_skb_any(skb);
  32         return false;
  33 }
  34
  35 static const struct team_mode_ops rnd_mode_ops = {
  36         .transmit               = rnd_transmit,
  37         .port_enter             = team_modeop_port_enter,
  38         .port_change_dev_addr   = team_modeop_port_change_dev_addr,
  39 };
  40
  41 static const struct team_mode rnd_mode = {
  42         .kind           = "random",
  43         .owner          = THIS_MODULE,
  44         .ops            = &rnd_mode_ops,
  45         .lag_tx_type    = NETDEV_LAG_TX_TYPE_RANDOM,
  46 };
  47
  48 static int __init rnd_init_module(void)
  49 {
  50         return team_mode_register(&rnd_mode);
  51 }
  52
  53 static void __exit rnd_cleanup_module(void)
  54 {
  55         team_mode_unregister(&rnd_mode);
  56 }
  57
  58 module_init(rnd_init_module);
  59 module_exit(rnd_cleanup_module);
  60
  61 MODULE_LICENSE("GPL v2");
  62 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
  63 MODULE_DESCRIPTION("Random mode for team");
  64 MODULE_ALIAS_TEAM_MODE("random");