Commit 01d7f30a authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

team: add loadbalance mode 



This patch introduces new team mode. It's TX port is selected by
user-set BPF hash function.

Signed-off-by: default avatarJiri Pirko <jpirko@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2615598f

drivers/net/team/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -40,4 +40,15 @@ config NET_TEAM_MODE_ACTIVEBACKUP 
	  To compile this team mode as a module, choose M here: the module

	  will be called team_mode_activebackup.



config NET_TEAM_MODE_LOADBALANCE

	tristate "Load-balance mode support"

	depends on NET_TEAM

	---help---

	  This mode provides load balancing functionality. Tx port selection

	  is done using BPF function set up from userspace (bpf_hash_func

	  option)



	  To compile this team mode as a module, choose M here: the module

	  will be called team_mode_loadbalance.



endif # NET_TEAM

drivers/net/team/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,3 +5,4 @@ 
obj-$(CONFIG_NET_TEAM) += team.o

obj-$(CONFIG_NET_TEAM_MODE_ROUNDROBIN) += team_mode_roundrobin.o

obj-$(CONFIG_NET_TEAM_MODE_ACTIVEBACKUP) += team_mode_activebackup.o

obj-$(CONFIG_NET_TEAM_MODE_LOADBALANCE) += team_mode_loadbalance.o

drivers/net/team/team_mode_loadbalance.c

0 → 100644
+188 −0
Original line number Diff line number Diff line 
/*

 * 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->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, void *arg)

{

	struct team_option_binary *tbinary = team_optarg_tbinary(arg);



	memset(tbinary, 0, sizeof(*tbinary));

	if (!lb_priv(team)->orig_fprog)

		return 0;



	tbinary->data_len = lb_priv(team)->orig_fprog->len *

			    sizeof(struct sock_filter);

	tbinary->data = lb_priv(team)->orig_fprog->filter;

	return 0;

}



static int __fprog_create(struct sock_fprog **pfprog, u32 data_len,

			  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, void *arg)

{

	struct team_option_binary *tbinary = team_optarg_tbinary(arg);

	struct sk_filter *fp = NULL;

	struct sock_fprog *fprog = NULL;

	int err;



	if (tbinary->data_len) {

		err = __fprog_create(&fprog, tbinary->data_len,

				     tbinary->data);

		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,

	},

};



int lb_init(struct team *team)

{

	return team_options_register(team, lb_options,

				     ARRAY_SIZE(lb_options));

}



void lb_exit(struct team *team)

{

	team_options_unregister(team, lb_options,

				ARRAY_SIZE(lb_options));

}



static int lb_port_enter(struct team *team, struct team_port *port)

{

	return team_port_set_team_mac(port);

}



static void lb_port_change_mac(struct team *team, struct team_port *port)

{

	team_port_set_team_mac(port);

}



static const struct team_mode_ops lb_mode_ops = {

	.init			= lb_init,

	.exit			= lb_exit,

	.transmit		= lb_transmit,

	.port_enter		= lb_port_enter,

	.port_change_mac	= lb_port_change_mac,

};



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");