net/hsr/hsr_main.c

   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                         ether_addr_copy(master->dev->dev_addr, 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 static struct notifier_block hsr_nb = {
 135         .notifier_call = hsr_netdev_notify,     /* Slave event notifications */
 136 };
 137
 138 static int __init hsr_init(void)
 139 {
 140         int res;
 141
 142         BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
 143
 144         register_netdevice_notifier(&hsr_nb);
 145         res = hsr_netlink_init();
 146
 147         return res;
 148 }
 149
 150 static void __exit hsr_exit(void)
 151 {
 152         hsr_netlink_exit();
 153         hsr_debugfs_remove_root();
 154         unregister_netdevice_notifier(&hsr_nb);
 155 }
 156
 157 module_init(hsr_init);
 158 module_exit(hsr_exit);
 159 MODULE_LICENSE("GPL");