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, struct team_gsetter_ctx *ctx) 63 { 64 if (ab_priv(team)->active_port) 65 ctx->data.u32_val = ab_priv(team)->active_port->dev->ifindex; 66 else 67 ctx->data.u32_val = 0; 68 return 0; 69 } 70 71 static int ab_active_port_set(struct team *team, struct team_gsetter_ctx *ctx) 72 { 73 struct team_port *port; 74 75 list_for_each_entry(port, &team->port_list, list) { 76 if (port->dev->ifindex == ctx->data.u32_val) { 77 rcu_assign_pointer(ab_priv(team)->active_port, port); 78 return 0; 79 } 80 } 81 return -ENOENT; 82 } 83 84 static const struct team_option ab_options[] = { 85 { 86 .name = "activeport", 87 .type = TEAM_OPTION_TYPE_U32, 88 .getter = ab_active_port_get, 89 .setter = ab_active_port_set, 90 }, 91 }; 92 93 static int ab_init(struct team *team) 94 { 95 return team_options_register(team, ab_options, ARRAY_SIZE(ab_options)); 96 } 97 98 static void ab_exit(struct team *team) 99 { 100 team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options)); 101 } 102 103 static const struct team_mode_ops ab_mode_ops = { 104 .init = ab_init, 105 .exit = ab_exit, 106 .receive = ab_receive, 107 .transmit = ab_transmit, 108 .port_leave = ab_port_leave, 109 }; 110 111 static struct team_mode ab_mode = { 112 .kind = "activebackup", 113 .owner = THIS_MODULE, 114 .priv_size = sizeof(struct ab_priv), 115 .ops = &ab_mode_ops, 116 }; 117 118 static int __init ab_init_module(void) 119 { 120 return team_mode_register(&ab_mode); 121 } 122 123 static void __exit ab_cleanup_module(void) 124 { 125 team_mode_unregister(&ab_mode); 126 } 127 128 module_init(ab_init_module); 129 module_exit(ab_cleanup_module); 130 131 MODULE_LICENSE("GPL v2"); 132 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>"); 133 MODULE_DESCRIPTION("Active-backup mode for team"); 134 MODULE_ALIAS("team-mode-activebackup"); 135