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6dab015cf8
Use rcu_access_pointer and rcu_dereference_protected to access RCU pointer by updater. Use RCU_INIT_POINTER for NULL assignment of RCU pointer. Signed-off-by: Jiri Pirko <jpirko@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/*
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* drivers/net/team/team_mode_activebackup.c - Active-backup mode for team
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* Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <net/rtnetlink.h>
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#include <linux/if_team.h>
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struct ab_priv {
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struct team_port __rcu *active_port;
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};
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static struct ab_priv *ab_priv(struct team *team)
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{
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return (struct ab_priv *) &team->mode_priv;
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}
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static rx_handler_result_t ab_receive(struct team *team, struct team_port *port,
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struct sk_buff *skb) {
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struct team_port *active_port;
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active_port = rcu_dereference(ab_priv(team)->active_port);
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if (active_port != port)
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return RX_HANDLER_EXACT;
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return RX_HANDLER_ANOTHER;
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}
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static bool ab_transmit(struct team *team, struct sk_buff *skb)
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{
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struct team_port *active_port;
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active_port = rcu_dereference_bh(ab_priv(team)->active_port);
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if (unlikely(!active_port))
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goto drop;
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skb->dev = active_port->dev;
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if (dev_queue_xmit(skb))
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return false;
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return true;
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drop:
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dev_kfree_skb_any(skb);
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return false;
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}
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static void ab_port_leave(struct team *team, struct team_port *port)
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{
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if (ab_priv(team)->active_port == port)
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RCU_INIT_POINTER(ab_priv(team)->active_port, NULL);
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}
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static int ab_active_port_get(struct team *team, struct team_gsetter_ctx *ctx)
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{
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struct team_port *active_port;
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active_port = rcu_dereference_protected(ab_priv(team)->active_port,
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lockdep_is_held(&team->lock));
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if (active_port)
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ctx->data.u32_val = active_port->dev->ifindex;
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else
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ctx->data.u32_val = 0;
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return 0;
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}
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static int ab_active_port_set(struct team *team, struct team_gsetter_ctx *ctx)
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{
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struct team_port *port;
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list_for_each_entry(port, &team->port_list, list) {
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if (port->dev->ifindex == ctx->data.u32_val) {
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rcu_assign_pointer(ab_priv(team)->active_port, port);
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return 0;
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}
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}
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return -ENOENT;
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}
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static const struct team_option ab_options[] = {
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{
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.name = "activeport",
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.type = TEAM_OPTION_TYPE_U32,
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.getter = ab_active_port_get,
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.setter = ab_active_port_set,
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},
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};
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static int ab_init(struct team *team)
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{
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return team_options_register(team, ab_options, ARRAY_SIZE(ab_options));
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}
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static void ab_exit(struct team *team)
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{
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team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options));
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}
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static const struct team_mode_ops ab_mode_ops = {
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.init = ab_init,
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.exit = ab_exit,
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.receive = ab_receive,
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.transmit = ab_transmit,
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.port_leave = ab_port_leave,
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};
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static const struct team_mode ab_mode = {
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.kind = "activebackup",
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.owner = THIS_MODULE,
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.priv_size = sizeof(struct ab_priv),
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.ops = &ab_mode_ops,
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};
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static int __init ab_init_module(void)
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{
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return team_mode_register(&ab_mode);
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}
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static void __exit ab_cleanup_module(void)
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{
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team_mode_unregister(&ab_mode);
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}
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module_init(ab_init_module);
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module_exit(ab_cleanup_module);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
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MODULE_DESCRIPTION("Active-backup mode for team");
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MODULE_ALIAS("team-mode-activebackup");
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