summaryrefslogtreecommitdiff
path: root/net/hsr/hsr_main.c
blob: f7e284f23b1f3ef941106cb01336eba026b26f73 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
// SPDX-License-Identifier: GPL-2.0
/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * Author(s):
 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
 *
 * Event handling for HSR and PRP devices.
 */

#include <linux/netdevice.h>
#include <net/rtnetlink.h>
#include <linux/rculist.h>
#include <linux/timer.h>
#include <linux/etherdevice.h>
#include "hsr_main.h"
#include "hsr_device.h"
#include "hsr_netlink.h"
#include "hsr_framereg.h"
#include "hsr_slave.h"

static bool hsr_slave_empty(struct hsr_priv *hsr)
{
	struct hsr_port *port;

	hsr_for_each_port(hsr, port)
		if (port->type != HSR_PT_MASTER)
			return false;
	return true;
}

static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
			     void *ptr)
{
	struct hsr_port *port, *master;
	struct net_device *dev;
	struct hsr_priv *hsr;
	LIST_HEAD(list_kill);
	int mtu_max;
	int res;

	dev = netdev_notifier_info_to_dev(ptr);
	port = hsr_port_get_rtnl(dev);
	if (!port) {
		if (!is_hsr_master(dev))
			return NOTIFY_DONE;	/* Not an HSR device */
		hsr = netdev_priv(dev);
		port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
		if (!port) {
			/* Resend of notification concerning removed device? */
			return NOTIFY_DONE;
		}
	} else {
		hsr = port->hsr;
	}

	switch (event) {
	case NETDEV_UP:		/* Administrative state DOWN */
	case NETDEV_DOWN:	/* Administrative state UP */
	case NETDEV_CHANGE:	/* Link (carrier) state changes */
		hsr_check_carrier_and_operstate(hsr);
		break;
	case NETDEV_CHANGENAME:
		if (is_hsr_master(dev))
			hsr_debugfs_rename(dev);
		break;
	case NETDEV_CHANGEADDR:
		if (port->type == HSR_PT_MASTER) {
			/* This should not happen since there's no
			 * ndo_set_mac_address() for HSR devices - i.e. not
			 * supported.
			 */
			break;
		}

		master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);

		if (port->type == HSR_PT_SLAVE_A) {
			ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
			call_netdevice_notifiers(NETDEV_CHANGEADDR,
						 master->dev);
		}

		/* Make sure we recognize frames from ourselves in hsr_rcv() */
		port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
		res = hsr_create_self_node(hsr,
					   master->dev->dev_addr,
					   port ?
						port->dev->dev_addr :
						master->dev->dev_addr);
		if (res)
			netdev_warn(master->dev,
				    "Could not update HSR node address.\n");
		break;
	case NETDEV_CHANGEMTU:
		if (port->type == HSR_PT_MASTER)
			break; /* Handled in ndo_change_mtu() */
		mtu_max = hsr_get_max_mtu(port->hsr);
		master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
		master->dev->mtu = mtu_max;
		break;
	case NETDEV_UNREGISTER:
		if (!is_hsr_master(dev)) {
			master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
			hsr_del_port(port);
			if (hsr_slave_empty(master->hsr)) {
				const struct rtnl_link_ops *ops;

				ops = master->dev->rtnl_link_ops;
				ops->dellink(master->dev, &list_kill);
				unregister_netdevice_many(&list_kill);
			}
		}
		break;
	case NETDEV_PRE_TYPE_CHANGE:
		/* HSR works only on Ethernet devices. Refuse slave to change
		 * its type.
		 */
		return NOTIFY_BAD;
	}

	return NOTIFY_DONE;
}

struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
{
	struct hsr_port *port;

	hsr_for_each_port(hsr, port)
		if (port->type == pt)
			return port;
	return NULL;
}

int hsr_get_version(struct net_device *dev, enum hsr_version *ver)
{
	struct hsr_priv *hsr;

	hsr = netdev_priv(dev);
	*ver = hsr->prot_version;

	return 0;
}
EXPORT_SYMBOL(hsr_get_version);

static struct notifier_block hsr_nb = {
	.notifier_call = hsr_netdev_notify,	/* Slave event notifications */
};

static int __init hsr_init(void)
{
	int res;

	BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);

	register_netdevice_notifier(&hsr_nb);
	res = hsr_netlink_init();

	return res;
}

static void __exit hsr_exit(void)
{
	hsr_netlink_exit();
	hsr_debugfs_remove_root();
	unregister_netdevice_notifier(&hsr_nb);
}

module_init(hsr_init);
module_exit(hsr_exit);
MODULE_LICENSE("GPL");