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
   8 #include <linux/netdevice.h>
   9 #include <linux/rculist.h>
  10 #include <linux/timer.h>
  11 #include <linux/etherdevice.h>
  12 #include "hsr_main.h"
  13 #include "hsr_device.h"
  14 #include "hsr_netlink.h"
  15 #include "hsr_framereg.h"
  16 #include "hsr_slave.h"
  17
  18 static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
  19                              void *ptr)
  20 {
  21         struct net_device *dev;
  22         struct hsr_port *port, *master;
  23         struct hsr_priv *hsr;
  24         int mtu_max;
  25         int res;
  26
  27         dev = netdev_notifier_info_to_dev(ptr);
  28         port = hsr_port_get_rtnl(dev);
  29         if (!port) {
  30                 if (!is_hsr_master(dev))
  31                         return NOTIFY_DONE;     /* Not an HSR device */
  32                 hsr = netdev_priv(dev);
  33                 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  34                 if (!port) {
  35                         /* Resend of notification concerning removed device? */
  36                         return NOTIFY_DONE;
  37                 }
  38         } else {
  39                 hsr = port->hsr;
  40         }
  41
  42         switch (event) {
  43         case NETDEV_UP:         /* Administrative state DOWN */
  44         case NETDEV_DOWN:       /* Administrative state UP */
  45         case NETDEV_CHANGE:     /* Link (carrier) state changes */
  46                 hsr_check_carrier_and_operstate(hsr);
  47                 break;
  48         case NETDEV_CHANGENAME:
  49                 if (is_hsr_master(dev))
  50                         hsr_debugfs_rename(dev);
  51                 break;
  52         case NETDEV_CHANGEADDR:
  53                 if (port->type == HSR_PT_MASTER) {
  54                         /* This should not happen since there's no
  55                          * ndo_set_mac_address() for HSR devices - i.e. not
  56                          * supported.
  57                          */
  58                         break;
  59                 }
  60
  61                 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  62
  63                 if (port->type == HSR_PT_SLAVE_A) {
  64                         ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
  65                         call_netdevice_notifiers(NETDEV_CHANGEADDR,
  66                                                  master->dev);
  67                 }
  68
  69                 /* Make sure we recognize frames from ourselves in hsr_rcv() */
  70                 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
  71                 res = hsr_create_self_node(hsr,
  72                                            master->dev->dev_addr,
  73                                            port ?
  74                                                 port->dev->dev_addr :
  75                                                 master->dev->dev_addr);
  76                 if (res)
  77                         netdev_warn(master->dev,
  78                                     "Could not update HSR node address.\n");
  79                 break;
  80         case NETDEV_CHANGEMTU:
  81                 if (port->type == HSR_PT_MASTER)
  82                         break; /* Handled in ndo_change_mtu() */
  83                 mtu_max = hsr_get_max_mtu(port->hsr);
  84                 master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
  85                 master->dev->mtu = mtu_max;
  86                 break;
  87         case NETDEV_UNREGISTER:
  88                 if (!is_hsr_master(dev))
  89                         hsr_del_port(port);
  90                 break;
  91         case NETDEV_PRE_TYPE_CHANGE:
  92                 /* HSR works only on Ethernet devices. Refuse slave to change
  93                  * its type.
  94                  */
  95                 return NOTIFY_BAD;
  96         }
  97
  98         return NOTIFY_DONE;
  99 }
 100
 101 struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
 102 {
 103         struct hsr_port *port;
 104
 105         hsr_for_each_port(hsr, port)
 106                 if (port->type == pt)
 107                         return port;
 108         return NULL;
 109 }
 110
 111 static struct notifier_block hsr_nb = {
 112         .notifier_call = hsr_netdev_notify,     /* Slave event notifications */
 113 };
 114
 115 static int __init hsr_init(void)
 116 {
 117         int res;
 118
 119         BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
 120
 121         register_netdevice_notifier(&hsr_nb);
 122         res = hsr_netlink_init();
 123
 124         return res;
 125 }
 126
 127 static void __exit hsr_exit(void)
 128 {
 129         unregister_netdevice_notifier(&hsr_nb);
 130         hsr_netlink_exit();
 131         hsr_debugfs_remove_root();
 132 }
 133
 134 module_init(hsr_init);
 135 module_exit(hsr_exit);
 136 MODULE_LICENSE("GPL");