tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/reciprocal_div.h>
17#include <linux/if_team.h>
18
19static u32 random_N(unsigned int N)
20{
21 return reciprocal_divide(prandom_u32(), N);
22}
23
24static bool rnd_transmit(struct team *team, struct sk_buff *skb)
25{
26 struct team_port *port;
27 int port_index;
28
29 port_index = random_N(team->en_port_count);
30 port = team_get_port_by_index_rcu(team, port_index);
31 if (unlikely(!port))
32 goto drop;
33 port = team_get_first_port_txable_rcu(team, port);
34 if (unlikely(!port))
35 goto drop;
36 if (team_dev_queue_xmit(team, port, skb))
37 return false;
38 return true;
39
40drop:
41 dev_kfree_skb_any(skb);
42 return false;
43}
44
45static const struct team_mode_ops rnd_mode_ops = {
46 .transmit = rnd_transmit,
47 .port_enter = team_modeop_port_enter,
48 .port_change_dev_addr = team_modeop_port_change_dev_addr,
49};
50
51static const struct team_mode rnd_mode = {
52 .kind = "random",
53 .owner = THIS_MODULE,
54 .ops = &rnd_mode_ops,
55};
56
57static int __init rnd_init_module(void)
58{
59 return team_mode_register(&rnd_mode);
60}
61
62static void __exit rnd_cleanup_module(void)
63{
64 team_mode_unregister(&rnd_mode);
65}
66
67module_init(rnd_init_module);
68module_exit(rnd_cleanup_module);
69
70MODULE_LICENSE("GPL v2");
71MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
72MODULE_DESCRIPTION("Random mode for team");
73MODULE_ALIAS("team-mode-random");