kernel/net/hsr/hsr_main.c

   1 /* Copyright 2011-2014 Autronica Fire and Security AS
   2  *
   3  * This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the GNU General Public License as published by the Free
   5  * Software Foundation; either version 2 of the License, or (at your option)
   6  * any later version.
   7  *
   8  * Author(s):
   9  *      2011-2014 Arvid Brodin, arvid.brodin@alten.se
  10  */
  11
  12 #include <linux/netdevice.h>
  13 #include <linux/rculist.h>
  14 #include <linux/timer.h>
  15 #include <linux/etherdevice.h>
  16 #include "hsr_main.h"
  17 #include "hsr_device.h"
  18 #include "hsr_netlink.h"
  19 #include "hsr_framereg.h"
  20 #include "hsr_slave.h"
  21
  22
  23 static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
  24                              void *ptr)
  25 {
  26         struct net_device *dev;
  27         struct hsr_port *port, *master;
  28         struct hsr_priv *hsr;
  29         int mtu_max;
  30         int res;
  31
  32         dev = netdev_notifier_info_to_dev(ptr);
  33         port = hsr_port_get_rtnl(dev);
  34         if (port == NULL) {
  35                 if (!is_hsr_master(dev))
  36                         return NOTIFY_DONE;     /* Not an HSR device */
  37                 hsr = netdev_priv(dev);
  38                 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  39                 if (port == NULL) {
  40                         /* Resend of notification concerning removed device? */
  41                         return NOTIFY_DONE;
  42                 }
  43         } else {
  44                 hsr = port->hsr;
  45         }
  46
  47         switch (event) {
  48         case NETDEV_UP:         /* Administrative state DOWN */
  49         case NETDEV_DOWN:       /* Administrative state UP */
  50         case NETDEV_CHANGE:     /* Link (carrier) state changes */
  51                 hsr_check_carrier_and_operstate(hsr);
  52                 break;
  53         case NETDEV_CHANGEADDR:
  54                 if (port->type == HSR_PT_MASTER) {
  55                         /* This should not happen since there's no
  56                          * ndo_set_mac_address() for HSR devices - i.e. not
  57                          * supported.
  58                          */
  59                         break;
  60                 }
  61
  62                 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
  63
  64                 if (port->type == HSR_PT_SLAVE_A) {
  65                         ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
  66                         call_netdevice_notifiers(NETDEV_CHANGEADDR, 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->self_node_db,
  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                 hsr_del_port(port);
  89                 break;
  90         case NETDEV_PRE_TYPE_CHANGE:
  91                 /* HSR works only on Ethernet devices. Refuse slave to change
  92                  * its type.
  93                  */
  94                 return NOTIFY_BAD;
  95         }
  96
  97         return NOTIFY_DONE;
  98 }
  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
 116 static int __init hsr_init(void)
 117 {
 118         int res;
 119
 120         BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
 121
 122         register_netdevice_notifier(&hsr_nb);
 123         res = hsr_netlink_init();
 124
 125         return res;
 126 }
 127
 128 static void __exit hsr_exit(void)
 129 {
 130         unregister_netdevice_notifier(&hsr_nb);
 131         hsr_netlink_exit();
 132 }
 133
 134 module_init(hsr_init);
 135 module_exit(hsr_exit);
 136 MODULE_LICENSE("GPL");