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
14static bool rnd_transmit(struct team *team, struct sk_buff *skb)
15{
16	struct team_port *port;
17	int port_index;
18
19	port_index = get_random_u32_below(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
30drop:
31	dev_kfree_skb_any(skb);
32	return false;
33}
34
35static 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
41static 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
48static int __init rnd_init_module(void)
49{
50	return team_mode_register(&rnd_mode);
51}
52
53static void __exit rnd_cleanup_module(void)
54{
55	team_mode_unregister(&rnd_mode);
56}
57
58module_init(rnd_init_module);
59module_exit(rnd_cleanup_module);
60
61MODULE_LICENSE("GPL v2");
62MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
63MODULE_DESCRIPTION("Random mode for team");
64MODULE_ALIAS_TEAM_MODE("random");
65