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Linux/net/hsr/hsr_main.c

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  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");
137 

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