1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * drivers/net/team/team_mode_roundrobin.c - Round-robin mode for team
4  * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
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/errno.h>
12 #include <linux/netdevice.h>
13 #include <linux/if_team.h>
14 
15 struct rr_priv {
16 	unsigned int sent_packets;
17 };
18 
19 static struct rr_priv *rr_priv(struct team *team)
20 {
21 	return (struct rr_priv *) &team->mode_priv;
22 }
23 
24 static bool rr_transmit(struct team *team, struct sk_buff *skb)
25 {
26 	struct team_port *port;
27 	int port_index;
28 
29 	port_index = team_num_to_port_index(team,
30 					    rr_priv(team)->sent_packets++);
31 	port = team_get_port_by_index_rcu(team, port_index);
32 	if (unlikely(!port))
33 		goto drop;
34 	port = team_get_first_port_txable_rcu(team, port);
35 	if (unlikely(!port))
36 		goto drop;
37 	if (team_dev_queue_xmit(team, port, skb))
38 		return false;
39 	return true;
40 
41 drop:
42 	dev_kfree_skb_any(skb);
43 	return false;
44 }
45 
46 static const struct team_mode_ops rr_mode_ops = {
47 	.transmit		= rr_transmit,
48 	.port_enter		= team_modeop_port_enter,
49 	.port_change_dev_addr	= team_modeop_port_change_dev_addr,
50 };
51 
52 static const struct team_mode rr_mode = {
53 	.kind		= "roundrobin",
54 	.owner		= THIS_MODULE,
55 	.priv_size	= sizeof(struct rr_priv),
56 	.ops		= &rr_mode_ops,
57 	.lag_tx_type	= NETDEV_LAG_TX_TYPE_ROUNDROBIN,
58 };
59 
60 static int __init rr_init_module(void)
61 {
62 	return team_mode_register(&rr_mode);
63 }
64 
65 static void __exit rr_cleanup_module(void)
66 {
67 	team_mode_unregister(&rr_mode);
68 }
69 
70 module_init(rr_init_module);
71 module_exit(rr_cleanup_module);
72 
73 MODULE_LICENSE("GPL v2");
74 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
75 MODULE_DESCRIPTION("Round-robin mode for team");
76 MODULE_ALIAS_TEAM_MODE("roundrobin");
77