aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/team/team_mode_loadbalance.c
blob: 86e8183c8e3d90129a4887037ea76a15b1d422d1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*
 * drivers/net/team/team_mode_loadbalance.c - Load-balancing mode for team
 * Copyright (c) 2012 Jiri Pirko <jpirko@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/filter.h>
#include <linux/if_team.h>

struct lb_priv {
	struct sk_filter __rcu *fp;
	struct sock_fprog *orig_fprog;
};

static struct lb_priv *lb_priv(struct team *team)
{
	return (struct lb_priv *) &team->mode_priv;
}

static bool lb_transmit(struct team *team, struct sk_buff *skb)
{
	struct sk_filter *fp;
	struct team_port *port;
	unsigned int hash;
	int port_index;

	fp = rcu_dereference(lb_priv(team)->fp);
	if (unlikely(!fp))
		goto drop;
	hash = SK_RUN_FILTER(fp, skb);
	port_index = hash % team->en_port_count;
	port = team_get_port_by_index_rcu(team, port_index);
	if (unlikely(!port))
		goto drop;
	skb->dev = port->dev;
	if (dev_queue_xmit(skb))
		return false;
	return true;

drop:
	dev_kfree_skb_any(skb);
	return false;
}

static int lb_bpf_func_get(struct team *team, struct team_gsetter_ctx *ctx)
{
	if (!lb_priv(team)->orig_fprog) {
		ctx->data.bin_val.len = 0;
		ctx->data.bin_val.ptr = NULL;
		return 0;
	}
	ctx->data.bin_val.len = lb_priv(team)->orig_fprog->len *
				sizeof(struct sock_filter);
	ctx->data.bin_val.ptr = lb_priv(team)->orig_fprog->filter;
	return 0;
}

static int __fprog_create(struct sock_fprog **pfprog, u32 data_len,
			  const void *data)
{
	struct sock_fprog *fprog;
	struct sock_filter *filter = (struct sock_filter *) data;

	if (data_len % sizeof(struct sock_filter))
		return -EINVAL;
	fprog = kmalloc(sizeof(struct sock_fprog), GFP_KERNEL);
	if (!fprog)
		return -ENOMEM;
	fprog->filter = kmemdup(filter, data_len, GFP_KERNEL);
	if (!fprog->filter) {
		kfree(fprog);
		return -ENOMEM;
	}
	fprog->len = data_len / sizeof(struct sock_filter);
	*pfprog = fprog;
	return 0;
}

static void __fprog_destroy(struct sock_fprog *fprog)
{
	kfree(fprog->filter);
	kfree(fprog);
}

static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
{
	struct sk_filter *fp = NULL;
	struct sock_fprog *fprog = NULL;
	int err;

	if (ctx->data.bin_val.len) {
		err = __fprog_create(&fprog, ctx->data.bin_val.len,
				     ctx->data.bin_val.ptr);
		if (err)
			return err;
		err = sk_unattached_filter_create(&fp, fprog);
		if (err) {
			__fprog_destroy(fprog);
			return err;
		}
	}

	if (lb_priv(team)->orig_fprog) {
		/* Clear old filter data */
		__fprog_destroy(lb_priv(team)->orig_fprog);
		sk_unattached_filter_destroy(lb_priv(team)->fp);
	}

	rcu_assign_pointer(lb_priv(team)->fp, fp);
	lb_priv(team)->orig_fprog = fprog;
	return 0;
}

static const struct team_option lb_options[] = {
	{
		.name = "bpf_hash_func",
		.type = TEAM_OPTION_TYPE_BINARY,
		.getter = lb_bpf_func_get,
		.setter = lb_bpf_func_set,
	},
};

static int lb_init(struct team *team)
{
	return team_options_register(team, lb_options,
				     ARRAY_SIZE(lb_options));
}

static void lb_exit(struct team *team)
{
	team_options_unregister(team, lb_options,
				ARRAY_SIZE(lb_options));
}

static const struct team_mode_ops lb_mode_ops = {
	.init			= lb_init,
	.exit			= lb_exit,
	.transmit		= lb_transmit,
};

static struct team_mode lb_mode = {
	.kind		= "loadbalance",
	.owner		= THIS_MODULE,
	.priv_size	= sizeof(struct lb_priv),
	.ops		= &lb_mode_ops,
};

static int __init lb_init_module(void)
{
	return team_mode_register(&lb_mode);
}

static void __exit lb_cleanup_module(void)
{
	team_mode_unregister(&lb_mode);
}

module_init(lb_init_module);
module_exit(lb_cleanup_module);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
MODULE_DESCRIPTION("Load-balancing mode for team");
MODULE_ALIAS("team-mode-loadbalance");