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 void 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 } 65 66 static void ab_active_port_get(struct team *team, struct team_gsetter_ctx *ctx) 67 { 68 struct team_port *active_port; 69 70 active_port = rcu_dereference_protected(ab_priv(team)->active_port, 71 lockdep_is_held(&team->lock)); 72 if (active_port) 73 ctx->data.u32_val = active_port->dev->ifindex; 74 else 75 ctx->data.u32_val = 0; 76 } 77 78 static int ab_active_port_set(struct team *team, struct team_gsetter_ctx *ctx) 79 { 80 struct team_port *port; 81 82 list_for_each_entry(port, &team->port_list, list) { 83 if (port->dev->ifindex == ctx->data.u32_val) { 84 rcu_assign_pointer(ab_priv(team)->active_port, port); 85 return 0; 86 } 87 } 88 return -ENOENT; 89 } 90 91 static const struct team_option ab_options[] = { 92 { 93 .name = "activeport", 94 .type = TEAM_OPTION_TYPE_U32, 95 .init = ab_active_port_init, 96 .getter = ab_active_port_get, 97 .setter = ab_active_port_set, 98 }, 99 }; 100 101 static int ab_init(struct team *team) 102 { 103 return team_options_register(team, ab_options, ARRAY_SIZE(ab_options)); 104 } 105 106 static void ab_exit(struct team *team) 107 { 108 team_options_unregister(team, ab_options, ARRAY_SIZE(ab_options)); 109 } 110 111 static const struct team_mode_ops ab_mode_ops = { 112 .init = ab_init, 113 .exit = ab_exit, 114 .receive = ab_receive, 115 .transmit = ab_transmit, 116 .port_leave = ab_port_leave, 117 }; 118 119 static const struct team_mode ab_mode = { 120 .kind = "activebackup", 121 .owner = THIS_MODULE, 122 .priv_size = sizeof(struct ab_priv), 123 .ops = &ab_mode_ops, 124 .lag_tx_type = NETDEV_LAG_TX_TYPE_ACTIVEBACKUP, 125 }; 126 127 static int __init ab_init_module(void) 128 { 129 return team_mode_register(&ab_mode); 130 } 131 132 static void __exit ab_cleanup_module(void) 133 { 134 team_mode_unregister(&ab_mode); 135 } 136 137 module_init(ab_init_module); 138 module_exit(ab_cleanup_module); 139 140 MODULE_LICENSE("GPL v2"); 141 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>"); 142 MODULE_DESCRIPTION("Active-backup mode for team"); 143 MODULE_ALIAS_TEAM_MODE("activebackup"); 144