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_roundrobin.c - Round-robin mode for team
3 * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
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/errno.h>
16#include <linux/netdevice.h>
17#include <linux/if_team.h>
18
19struct rr_priv {
20 unsigned int sent_packets;
21};
22
23static struct rr_priv *rr_priv(struct team *team)
24{
25 return (struct rr_priv *) &team->mode_priv;
26}
27
28static struct team_port *__get_first_port_up(struct team *team,
29 struct team_port *port)
30{
31 struct team_port *cur;
32
33 if (team_port_txable(port))
34 return port;
35 cur = port;
36 list_for_each_entry_continue_rcu(cur, &team->port_list, list)
37 if (team_port_txable(port))
38 return cur;
39 list_for_each_entry_rcu(cur, &team->port_list, list) {
40 if (cur == port)
41 break;
42 if (team_port_txable(port))
43 return cur;
44 }
45 return NULL;
46}
47
48static bool rr_transmit(struct team *team, struct sk_buff *skb)
49{
50 struct team_port *port;
51 int port_index;
52
53 port_index = rr_priv(team)->sent_packets++ % team->en_port_count;
54 port = team_get_port_by_index_rcu(team, port_index);
55 port = __get_first_port_up(team, port);
56 if (unlikely(!port))
57 goto drop;
58 if (team_dev_queue_xmit(team, port, skb))
59 return false;
60 return true;
61
62drop:
63 dev_kfree_skb_any(skb);
64 return false;
65}
66
67static int rr_port_enter(struct team *team, struct team_port *port)
68{
69 return team_port_set_team_dev_addr(port);
70}
71
72static void rr_port_change_dev_addr(struct team *team, struct team_port *port)
73{
74 team_port_set_team_dev_addr(port);
75}
76
77static const struct team_mode_ops rr_mode_ops = {
78 .transmit = rr_transmit,
79 .port_enter = rr_port_enter,
80 .port_change_dev_addr = rr_port_change_dev_addr,
81};
82
83static const struct team_mode rr_mode = {
84 .kind = "roundrobin",
85 .owner = THIS_MODULE,
86 .priv_size = sizeof(struct rr_priv),
87 .ops = &rr_mode_ops,
88};
89
90static int __init rr_init_module(void)
91{
92 return team_mode_register(&rr_mode);
93}
94
95static void __exit rr_cleanup_module(void)
96{
97 team_mode_unregister(&rr_mode);
98}
99
100module_init(rr_init_module);
101module_exit(rr_cleanup_module);
102
103MODULE_LICENSE("GPL v2");
104MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
105MODULE_DESCRIPTION("Round-robin mode for team");
106MODULE_ALIAS("team-mode-roundrobin");