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"); 146