linux/drivers/net/team/team_mode_activebackup.c
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   1/*
   2 * drivers/net/team/team_mode_activebackup.c - Active-backup 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 <net/rtnetlink.h>
  18#include <linux/if_team.h>
  19
  20struct ab_priv {
  21        struct team_port __rcu *active_port;
  22        struct team_option_inst_info *ap_opt_inst_info;
  23};
  24
  25static struct ab_priv *ab_priv(struct team *team)
  26{
  27        return (struct ab_priv *) &team->mode_priv;
  28}
  29
  30static 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
  40static bool ab_transmit(struct team *team, struct sk_buff *skb)
  41{
  42        struct team_port *active_port;
  43
  44        active_port = rcu_dereference_bh(ab_priv(team)->active_port);
  45        if (unlikely(!active_port))
  46                goto drop;
  47        if (team_dev_queue_xmit(team, active_port, skb))
  48                return false;
  49        return true;
  50
  51drop:
  52        dev_kfree_skb_any(skb);
  53        return false;
  54}
  55
  56static void ab_port_leave(struct team *team, struct team_port *port)
  57{
  58        if (ab_priv(team)->active_port == port) {
  59                RCU_INIT_POINTER(ab_priv(team)->active_port, NULL);
  60                team_option_inst_set_change(ab_priv(team)->ap_opt_inst_info);
  61        }
  62}
  63
  64static 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;
  69}
  70
  71static int ab_active_port_get(struct team *team, struct team_gsetter_ctx *ctx)
  72{
  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;
  79        else
  80                ctx->data.u32_val = 0;
  81        return 0;
  82}
  83
  84static int ab_active_port_set(struct team *team, struct team_gsetter_ctx *ctx)
  85{
  86        struct team_port *port;
  87
  88        list_for_each_entry(port, &team->port_list, list) {
  89                if (port->dev->ifindex == ctx->data.u32_val) {
  90                        rcu_assign_pointer(ab_priv(team)->active_port, port);
  91                        return 0;
  92                }
  93        }
  94        return -ENOENT;
  95}
  96
  97static const struct team_option ab_options[] = {
  98        {
  99                .name = "activeport",
 100                .type = TEAM_OPTION_TYPE_U32,
 101                .init = ab_active_port_init,
 102                .getter = ab_active_port_get,
 103                .setter = ab_active_port_set,
 104        },
 105};
 106
 107static int ab_init(struct team *team)
 108{
 109        return team_options_register(team, ab_options, ARRAY_SIZE(ab_options));
 110}
 111
 112static void ab_exit(struct team *team)
 113{
 114        team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options));
 115}
 116
 117static 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
 125static const struct team_mode ab_mode = {
 126        .kind           = "activebackup",
 127        .owner          = THIS_MODULE,
 128        .priv_size      = sizeof(struct ab_priv),
 129        .ops            = &ab_mode_ops,
 130        .lag_tx_type    = NETDEV_LAG_TX_TYPE_ACTIVEBACKUP,
 131};
 132
 133static int __init ab_init_module(void)
 134{
 135        return team_mode_register(&ab_mode);
 136}
 137
 138static void __exit ab_cleanup_module(void)
 139{
 140        team_mode_unregister(&ab_mode);
 141}
 142
 143module_init(ab_init_module);
 144module_exit(ab_cleanup_module);
 145
 146MODULE_LICENSE("GPL v2");
 147MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
 148MODULE_DESCRIPTION("Active-backup mode for team");
 149MODULE_ALIAS_TEAM_MODE("activebackup");
 150