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 20 struct ab_priv { 21 struct team_port __rcu *active_port; 22 struct team_option_inst_info *ap_opt_inst_info; 23 }; 24 25 static struct ab_priv *ab_priv(struct team *team) 26 { 27 return (struct ab_priv *) &team->mode_priv; 28 } 29 30 static 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 40 static 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 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 team_option_inst_set_change(ab_priv(team)->ap_opt_inst_info); 61 } 62 } 63 64 static 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 71 static 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 84 static 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 97 static 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 }; 106 107 static int ab_init(struct team *team) 108 { 109 return team_options_register(team, ab_options, ARRAY_SIZE(ab_options)); 110 } 111 112 static void ab_exit(struct team *team) 113 { 114 team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options)); 115 } 116 117 static 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 }; 124 125 static 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 }; 131 132 static int __init ab_init_module(void) 133 { 134 return team_mode_register(&ab_mode); 135 } 136 137 static void __exit ab_cleanup_module(void) 138 { 139 team_mode_unregister(&ab_mode); 140 } 141 142 module_init(ab_init_module); 143 module_exit(ab_cleanup_module); 144 145 MODULE_LICENSE("GPL v2"); 146 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>"); 147 MODULE_DESCRIPTION("Active-backup mode for team"); 148 MODULE_ALIAS("team-mode-activebackup"); 149