1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright 2011-2014 Autronica Fire and Security AS 3 * 4 * Author(s): 5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se 6 * 7 * Event handling for HSR and PRP devices. 8 */ 9 10 #include <linux/netdevice.h> 11 #include <net/rtnetlink.h> 12 #include <linux/rculist.h> 13 #include <linux/timer.h> 14 #include <linux/etherdevice.h> 15 #include "hsr_main.h" 16 #include "hsr_device.h" 17 #include "hsr_netlink.h" 18 #include "hsr_framereg.h" 19 #include "hsr_slave.h" 20 21 static bool hsr_slave_empty(struct hsr_priv *hsr) 22 { 23 struct hsr_port *port; 24 25 hsr_for_each_port(hsr, port) 26 if (port->type != HSR_PT_MASTER) 27 return false; 28 return true; 29 } 30 31 static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event, 32 void *ptr) 33 { 34 struct hsr_port *port, *master; 35 struct net_device *dev; 36 struct hsr_priv *hsr; 37 LIST_HEAD(list_kill); 38 int mtu_max; 39 int res; 40 41 dev = netdev_notifier_info_to_dev(ptr); 42 port = hsr_port_get_rtnl(dev); 43 if (!port) { 44 if (!is_hsr_master(dev)) 45 return NOTIFY_DONE; /* Not an HSR device */ 46 hsr = netdev_priv(dev); 47 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 48 if (!port) { 49 /* Resend of notification concerning removed device? */ 50 return NOTIFY_DONE; 51 } 52 } else { 53 hsr = port->hsr; 54 } 55 56 switch (event) { 57 case NETDEV_UP: /* Administrative state DOWN */ 58 case NETDEV_DOWN: /* Administrative state UP */ 59 case NETDEV_CHANGE: /* Link (carrier) state changes */ 60 hsr_check_carrier_and_operstate(hsr); 61 break; 62 case NETDEV_CHANGENAME: 63 if (is_hsr_master(dev)) 64 hsr_debugfs_rename(dev); 65 break; 66 case NETDEV_CHANGEADDR: 67 if (port->type == HSR_PT_MASTER) { 68 /* This should not happen since there's no 69 * ndo_set_mac_address() for HSR devices - i.e. not 70 * supported. 71 */ 72 break; 73 } 74 75 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 76 77 if (port->type == HSR_PT_SLAVE_A) { 78 eth_hw_addr_set(master->dev, dev->dev_addr); 79 call_netdevice_notifiers(NETDEV_CHANGEADDR, 80 master->dev); 81 } 82 83 /* Make sure we recognize frames from ourselves in hsr_rcv() */ 84 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); 85 res = hsr_create_self_node(hsr, 86 master->dev->dev_addr, 87 port ? 88 port->dev->dev_addr : 89 master->dev->dev_addr); 90 if (res) 91 netdev_warn(master->dev, 92 "Could not update HSR node address.\n"); 93 break; 94 case NETDEV_CHANGEMTU: 95 if (port->type == HSR_PT_MASTER) 96 break; /* Handled in ndo_change_mtu() */ 97 mtu_max = hsr_get_max_mtu(port->hsr); 98 master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER); 99 master->dev->mtu = mtu_max; 100 break; 101 case NETDEV_UNREGISTER: 102 if (!is_hsr_master(dev)) { 103 master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER); 104 hsr_del_port(port); 105 if (hsr_slave_empty(master->hsr)) { 106 const struct rtnl_link_ops *ops; 107 108 ops = master->dev->rtnl_link_ops; 109 ops->dellink(master->dev, &list_kill); 110 unregister_netdevice_many(&list_kill); 111 } 112 } 113 break; 114 case NETDEV_PRE_TYPE_CHANGE: 115 /* HSR works only on Ethernet devices. Refuse slave to change 116 * its type. 117 */ 118 return NOTIFY_BAD; 119 } 120 121 return NOTIFY_DONE; 122 } 123 124 struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt) 125 { 126 struct hsr_port *port; 127 128 hsr_for_each_port(hsr, port) 129 if (port->type == pt) 130 return port; 131 return NULL; 132 } 133 134 int hsr_get_version(struct net_device *dev, enum hsr_version *ver) 135 { 136 struct hsr_priv *hsr; 137 138 hsr = netdev_priv(dev); 139 *ver = hsr->prot_version; 140 141 return 0; 142 } 143 EXPORT_SYMBOL(hsr_get_version); 144 145 static struct notifier_block hsr_nb = { 146 .notifier_call = hsr_netdev_notify, /* Slave event notifications */ 147 }; 148 149 static int __init hsr_init(void) 150 { 151 int err; 152 153 BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN); 154 155 err = register_netdevice_notifier(&hsr_nb); 156 if (err) 157 return err; 158 159 err = hsr_netlink_init(); 160 if (err) { 161 unregister_netdevice_notifier(&hsr_nb); 162 return err; 163 } 164 165 return 0; 166 } 167 168 static void __exit hsr_exit(void) 169 { 170 hsr_netlink_exit(); 171 hsr_debugfs_remove_root(); 172 unregister_netdevice_notifier(&hsr_nb); 173 } 174 175 module_init(hsr_init); 176 module_exit(hsr_exit); 177 MODULE_DESCRIPTION("High-availability Seamless Redundancy (HSR) driver"); 178 MODULE_LICENSE("GPL"); 179