1 /* 2 * net/drivers/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 20 struct ab_priv { 21 struct team_port __rcu *active_port; 22 }; 23 24 static struct ab_priv *ab_priv(struct team *team) 25 { 26 return (struct ab_priv *) &team->mode_priv; 27 } 28 29 static rx_handler_result_t ab_receive(struct team *team, struct team_port *port, 30 struct sk_buff *skb) { 31 struct team_port *active_port; 32 33 active_port = rcu_dereference(ab_priv(team)->active_port); 34 if (active_port != port) 35 return RX_HANDLER_EXACT; 36 return RX_HANDLER_ANOTHER; 37 } 38 39 static bool ab_transmit(struct team *team, struct sk_buff *skb) 40 { 41 struct team_port *active_port; 42 43 active_port = rcu_dereference(ab_priv(team)->active_port); 44 if (unlikely(!active_port)) 45 goto drop; 46 skb->dev = active_port->dev; 47 if (dev_queue_xmit(skb)) 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 { 58 if (ab_priv(team)->active_port == port) 59 RCU_INIT_POINTER(ab_priv(team)->active_port, NULL); 60 } 61 62 static int ab_active_port_get(struct team *team, void *arg) 63 { 64 u32 *ifindex = arg; 65 66 *ifindex = 0; 67 if (ab_priv(team)->active_port) 68 *ifindex = ab_priv(team)->active_port->dev->ifindex; 69 return 0; 70 } 71 72 static int ab_active_port_set(struct team *team, void *arg) 73 { 74 u32 *ifindex = arg; 75 struct team_port *port; 76 77 list_for_each_entry_rcu(port, &team->port_list, list) { 78 if (port->dev->ifindex == *ifindex) { 79 rcu_assign_pointer(ab_priv(team)->active_port, port); 80 return 0; 81 } 82 } 83 return -ENOENT; 84 } 85 86 static const struct team_option ab_options[] = { 87 { 88 .name = "activeport", 89 .type = TEAM_OPTION_TYPE_U32, 90 .getter = ab_active_port_get, 91 .setter = ab_active_port_set, 92 }, 93 }; 94 95 int ab_init(struct team *team) 96 { 97 return team_options_register(team, ab_options, ARRAY_SIZE(ab_options)); 98 } 99 100 void ab_exit(struct team *team) 101 { 102 team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options)); 103 } 104 105 static const struct team_mode_ops ab_mode_ops = { 106 .init = ab_init, 107 .exit = ab_exit, 108 .receive = ab_receive, 109 .transmit = ab_transmit, 110 .port_leave = ab_port_leave, 111 }; 112 113 static struct team_mode ab_mode = { 114 .kind = "activebackup", 115 .owner = THIS_MODULE, 116 .priv_size = sizeof(struct ab_priv), 117 .ops = &ab_mode_ops, 118 }; 119 120 static int __init ab_init_module(void) 121 { 122 return team_mode_register(&ab_mode); 123 } 124 125 static void __exit ab_cleanup_module(void) 126 { 127 team_mode_unregister(&ab_mode); 128 } 129 130 module_init(ab_init_module); 131 module_exit(ab_cleanup_module); 132 133 MODULE_LICENSE("GPL v2"); 134 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>"); 135 MODULE_DESCRIPTION("Active-backup mode for team"); 136 MODULE_ALIAS("team-mode-activebackup"); 137