[linux-2.6-block.git] / drivers / net / team / team_mode_activebackup.c

/*
 * drivers/net/team/team_mode_activebackup.c - Active-backup mode for team
 * Copyright (c) 2011 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 <net/rtnetlink.h>
#include <linux/if_team.h>

struct ab_priv {
	struct team_port __rcu *active_port;
	struct team_option_inst_info *ap_opt_inst_info;
};

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

static rx_handler_result_t ab_receive(struct team *team, struct team_port *port,
				      struct sk_buff *skb) {
	struct team_port *active_port;

	active_port = rcu_dereference(ab_priv(team)->active_port);
	if (active_port != port)
		return RX_HANDLER_EXACT;
	return RX_HANDLER_ANOTHER;
}

static bool ab_transmit(struct team *team, struct sk_buff *skb)
{
	struct team_port *active_port;

	active_port = rcu_dereference_bh(ab_priv(team)->active_port);
	if (unlikely(!active_port))
		goto drop;
	if (team_dev_queue_xmit(team, active_port, skb))
		return false;
	return true;

drop:
	dev_kfree_skb_any(skb);
	return false;
}

static void ab_port_leave(struct team *team, struct team_port *port)
{
	if (ab_priv(team)->active_port == port) {
		RCU_INIT_POINTER(ab_priv(team)->active_port, NULL);
		team_option_inst_set_change(ab_priv(team)->ap_opt_inst_info);
	}
}

static int ab_active_port_init(struct team *team,
			       struct team_option_inst_info *info)
{
	ab_priv(team)->ap_opt_inst_info = info;
	return 0;
}

static int ab_active_port_get(struct team *team, struct team_gsetter_ctx *ctx)
{
	struct team_port *active_port;

	active_port = rcu_dereference_protected(ab_priv(team)->active_port,
						lockdep_is_held(&team->lock));
	if (active_port)
		ctx->data.u32_val = active_port->dev->ifindex;
	else
		ctx->data.u32_val = 0;
	return 0;
}

static int ab_active_port_set(struct team *team, struct team_gsetter_ctx *ctx)
{
	struct team_port *port;

	list_for_each_entry(port, &team->port_list, list) {
		if (port->dev->ifindex == ctx->data.u32_val) {
			rcu_assign_pointer(ab_priv(team)->active_port, port);
			return 0;
		}
	}
	return -ENOENT;
}

static const struct team_option ab_options[] = {
	{
		.name = "activeport",
		.type = TEAM_OPTION_TYPE_U32,
		.init = ab_active_port_init,
		.getter = ab_active_port_get,
		.setter = ab_active_port_set,
	},
};

static int ab_init(struct team *team)
{
	return team_options_register(team, ab_options, ARRAY_SIZE(ab_options));
}

static void ab_exit(struct team *team)
{
	team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options));
}

static const struct team_mode_ops ab_mode_ops = {
	.init			= ab_init,
	.exit			= ab_exit,
	.receive		= ab_receive,
	.transmit		= ab_transmit,
	.port_leave		= ab_port_leave,
};

static const struct team_mode ab_mode = {
	.kind		= "activebackup",
	.owner		= THIS_MODULE,
	.priv_size	= sizeof(struct ab_priv),
	.ops		= &ab_mode_ops,
};

static int __init ab_init_module(void)
{
	return team_mode_register(&ab_mode);
}

static void __exit ab_cleanup_module(void)
{
	team_mode_unregister(&ab_mode);
}

module_init(ab_init_module);
module_exit(ab_cleanup_module);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
MODULE_DESCRIPTION("Active-backup mode for team");
MODULE_ALIAS("team-mode-activebackup");
Commit	Line	Data
3d249d4c	1	/*
0d572e45	2	* drivers/net/team/team_mode_activebackup.c - Active-backup mode for team
3d249d4c JP	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 <net/rtnetlink.h>
	18	#include <linux/if_team.h>
	19
	20	struct ab_priv {
	21	struct team_port __rcu *active_port;
675b8044	22	struct team_option_inst_info *ap_opt_inst_info;
3d249d4c JP	23	};
	24
	25	static struct ab_priv ab_priv(struct team team)
	26	{
	27	return (struct ab_priv *) &team->mode_priv;
	28	}
	29
	30	static rx_handler_result_t ab_receive(struct team team, struct team_port port,
	31	struct sk_buff *skb) {
	32	struct team_port *active_port;
	33
	34	active_port = rcu_dereference(ab_priv(team)->active_port);
	35	if (active_port != port)
	36	return RX_HANDLER_EXACT;
	37	return RX_HANDLER_ANOTHER;
	38	}
	39
	40	static bool ab_transmit(struct team team, struct sk_buff skb)
	41	{
	42	struct team_port *active_port;
	43
d1904fbd	44	active_port = rcu_dereference_bh(ab_priv(team)->active_port);
3d249d4c JP	45	if (unlikely(!active_port))
3d249d4c JP	46	goto drop;
bd2d0837	47	if (team_dev_queue_xmit(team, active_port, skb))
3d249d4c JP	48	return false;
	49	return true;
	50
	51	drop:
	52	dev_kfree_skb_any(skb);
	53	return false;
	54	}
	55
	56	static void ab_port_leave(struct team team, struct team_port port)
	57	{
675b8044	58	if (ab_priv(team)->active_port == port) {
2cfa5a04	59	RCU_INIT_POINTER(ab_priv(team)->active_port, NULL);
675b8044 JP	60	team_option_inst_set_change(ab_priv(team)->ap_opt_inst_info);
	61	}
	62	}
	63
	64	static int ab_active_port_init(struct team *team,
	65	struct team_option_inst_info *info)
	66	{
	67	ab_priv(team)->ap_opt_inst_info = info;
	68	return 0;
3d249d4c JP	69	}
3d249d4c JP	70
80f7c668	71	static int ab_active_port_get(struct team team, struct team_gsetter_ctx ctx)
3d249d4c	72	{
6dab015c JP	73	struct team_port *active_port;
	74
	75	active_port = rcu_dereference_protected(ab_priv(team)->active_port,
	76	lockdep_is_held(&team->lock));
	77	if (active_port)
	78	ctx->data.u32_val = active_port->dev->ifindex;
80f7c668 JP	79	else
80f7c668 JP	80	ctx->data.u32_val = 0;
3d249d4c JP	81	return 0;
	82	}
	83
80f7c668	84	static int ab_active_port_set(struct team team, struct team_gsetter_ctx ctx)
3d249d4c	85	{
3d249d4c JP	86	struct team_port *port;
3d249d4c JP	87
679b1607	88	list_for_each_entry(port, &team->port_list, list) {
80f7c668	89	if (port->dev->ifindex == ctx->data.u32_val) {
3d249d4c JP	90	rcu_assign_pointer(ab_priv(team)->active_port, port);
	91	return 0;
	92	}
	93	}
	94	return -ENOENT;
	95	}
	96
358b8382	97	static const struct team_option ab_options[] = {
3d249d4c JP	98	{
	99	.name = "activeport",
	100	.type = TEAM_OPTION_TYPE_U32,
675b8044	101	.init = ab_active_port_init,
3d249d4c JP	102	.getter = ab_active_port_get,
	103	.setter = ab_active_port_set,
	104	},
	105	};
	106
cade4555	107	static int ab_init(struct team *team)
3d249d4c	108	{
358b8382	109	return team_options_register(team, ab_options, ARRAY_SIZE(ab_options));
3d249d4c JP	110	}
3d249d4c JP	111
cade4555	112	static void ab_exit(struct team *team)
3d249d4c JP	113	{
	114	team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options));
	115	}
	116
	117	static const struct team_mode_ops ab_mode_ops = {
	118	.init = ab_init,
	119	.exit = ab_exit,
	120	.receive = ab_receive,
	121	.transmit = ab_transmit,
	122	.port_leave = ab_port_leave,
	123	};
	124
0402788a	125	static const struct team_mode ab_mode = {
3d249d4c JP	126	.kind = "activebackup",
	127	.owner = THIS_MODULE,
	128	.priv_size = sizeof(struct ab_priv),
	129	.ops = &ab_mode_ops,
	130	};
	131
	132	static int __init ab_init_module(void)
	133	{
	134	return team_mode_register(&ab_mode);
	135	}
	136
	137	static void __exit ab_cleanup_module(void)
	138	{
	139	team_mode_unregister(&ab_mode);
	140	}
	141
	142	module_init(ab_init_module);
	143	module_exit(ab_cleanup_module);
	144
	145	MODULE_LICENSE("GPL v2");
	146	MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
	147	MODULE_DESCRIPTION("Active-backup mode for team");
	148	MODULE_ALIAS("team-mode-activebackup");