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");
65