drivers/net/team/team_mode_activebackup.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers/net/team/team_mode_activebackup.c - Active-backup mode for team
   4  * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/types.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12 #include <linux/netdevice.h>
  13 #include <net/rtnetlink.h>
  14 #include <linux/if_team.h>
  15
  16 struct ab_priv {
  17         struct team_port __rcu *active_port;
  18         struct team_option_inst_info *ap_opt_inst_info;
  19 };
  20
  21 static struct ab_priv *ab_priv(struct team *team)
  22 {
  23         return (struct ab_priv *) &team->mode_priv;
  24 }
  25
  26 static rx_handler_result_t ab_receive(struct team *team, struct team_port *port,
  27                                       struct sk_buff *skb) {
  28         struct team_port *active_port;
  29
  30         active_port = rcu_dereference(ab_priv(team)->active_port);
  31         if (active_port != port)
  32                 return RX_HANDLER_EXACT;
  33         return RX_HANDLER_ANOTHER;
  34 }
  35
  36 static bool ab_transmit(struct team *team, struct sk_buff *skb)
  37 {
  38         struct team_port *active_port;
  39
  40         active_port = rcu_dereference_bh(ab_priv(team)->active_port);
  41         if (unlikely(!active_port))
  42                 goto drop;
  43         if (team_dev_queue_xmit(team, active_port, skb))
  44                 return false;
  45         return true;
  46
  47 drop:
  48         dev_kfree_skb_any(skb);
  49         return false;
  50 }
  51
  52 static void ab_port_leave(struct team *team, struct team_port *port)
  53 {
  54         if (ab_priv(team)->active_port == port) {
  55                 RCU_INIT_POINTER(ab_priv(team)->active_port, NULL);
  56                 team_option_inst_set_change(ab_priv(team)->ap_opt_inst_info);
  57         }
  58 }
  59
  60 static int ab_active_port_init(struct team *team,
  61                                struct team_option_inst_info *info)
  62 {
  63         ab_priv(team)->ap_opt_inst_info = info;
  64         return 0;
  65 }
  66
  67 static int ab_active_port_get(struct team *team, struct team_gsetter_ctx *ctx)
  68 {
  69         struct team_port *active_port;
  70
  71         active_port = rcu_dereference_protected(ab_priv(team)->active_port,
  72                                                 lockdep_is_held(&team->lock));
  73         if (active_port)
  74                 ctx->data.u32_val = active_port->dev->ifindex;
  75         else
  76                 ctx->data.u32_val = 0;
  77         return 0;
  78 }
  79
  80 static int ab_active_port_set(struct team *team, struct team_gsetter_ctx *ctx)
  81 {
  82         struct team_port *port;
  83
  84         list_for_each_entry(port, &team->port_list, list) {
  85                 if (port->dev->ifindex == ctx->data.u32_val) {
  86                         rcu_assign_pointer(ab_priv(team)->active_port, port);
  87                         return 0;
  88                 }
  89         }
  90         return -ENOENT;
  91 }
  92
  93 static const struct team_option ab_options[] = {
  94         {
  95                 .name = "activeport",
  96                 .type = TEAM_OPTION_TYPE_U32,
  97                 .init = ab_active_port_init,
  98                 .getter = ab_active_port_get,
  99                 .setter = ab_active_port_set,
 100         },
 101 };
 102
 103 static int ab_init(struct team *team)
 104 {
 105         return team_options_register(team, ab_options, ARRAY_SIZE(ab_options));
 106 }
 107
 108 static void ab_exit(struct team *team)
 109 {
 110         team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options));
 111 }
 112
 113 static const struct team_mode_ops ab_mode_ops = {
 114         .init                   = ab_init,
 115         .exit                   = ab_exit,
 116         .receive                = ab_receive,
 117         .transmit               = ab_transmit,
 118         .port_leave             = ab_port_leave,
 119 };
 120
 121 static const struct team_mode ab_mode = {
 122         .kind           = "activebackup",
 123         .owner          = THIS_MODULE,
 124         .priv_size      = sizeof(struct ab_priv),
 125         .ops            = &ab_mode_ops,
 126         .lag_tx_type    = NETDEV_LAG_TX_TYPE_ACTIVEBACKUP,
 127 };
 128
 129 static int __init ab_init_module(void)
 130 {
 131         return team_mode_register(&ab_mode);
 132 }
 133
 134 static void __exit ab_cleanup_module(void)
 135 {
 136         team_mode_unregister(&ab_mode);
 137 }
 138
 139 module_init(ab_init_module);
 140 module_exit(ab_cleanup_module);
 141
 142 MODULE_LICENSE("GPL v2");
 143 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
 144 MODULE_DESCRIPTION("Active-backup mode for team");
 145 MODULE_ALIAS_TEAM_MODE("activebackup");