xref: /openbmc/linux/net/bridge/br_device.c (revision 643d1f7f)
1 /*
2  *	Device handling code
3  *	Linux ethernet bridge
4  *
5  *	Authors:
6  *	Lennert Buytenhek		<buytenh@gnu.org>
7  *
8  *	$Id: br_device.c,v 1.6 2001/12/24 00:59:55 davem Exp $
9  *
10  *	This program is free software; you can redistribute it and/or
11  *	modify it under the terms of the GNU General Public License
12  *	as published by the Free Software Foundation; either version
13  *	2 of the License, or (at your option) any later version.
14  */
15 
16 #include <linux/kernel.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/ethtool.h>
20 
21 #include <asm/uaccess.h>
22 #include "br_private.h"
23 
24 static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
25 {
26 	struct net_bridge *br = netdev_priv(dev);
27 	return &br->statistics;
28 }
29 
30 /* net device transmit always called with no BH (preempt_disabled) */
31 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
32 {
33 	struct net_bridge *br = netdev_priv(dev);
34 	const unsigned char *dest = skb->data;
35 	struct net_bridge_fdb_entry *dst;
36 
37 	br->statistics.tx_packets++;
38 	br->statistics.tx_bytes += skb->len;
39 
40 	skb_reset_mac_header(skb);
41 	skb_pull(skb, ETH_HLEN);
42 
43 	if (dest[0] & 1)
44 		br_flood_deliver(br, skb);
45 	else if ((dst = __br_fdb_get(br, dest)) != NULL)
46 		br_deliver(dst->dst, skb);
47 	else
48 		br_flood_deliver(br, skb);
49 
50 	return 0;
51 }
52 
53 static int br_dev_open(struct net_device *dev)
54 {
55 	struct net_bridge *br = netdev_priv(dev);
56 
57 	br_features_recompute(br);
58 	netif_start_queue(dev);
59 	br_stp_enable_bridge(br);
60 
61 	return 0;
62 }
63 
64 static void br_dev_set_multicast_list(struct net_device *dev)
65 {
66 }
67 
68 static int br_dev_stop(struct net_device *dev)
69 {
70 	br_stp_disable_bridge(netdev_priv(dev));
71 
72 	netif_stop_queue(dev);
73 
74 	return 0;
75 }
76 
77 static int br_change_mtu(struct net_device *dev, int new_mtu)
78 {
79 	if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
80 		return -EINVAL;
81 
82 	dev->mtu = new_mtu;
83 	return 0;
84 }
85 
86 /* Allow setting mac address to any valid ethernet address. */
87 static int br_set_mac_address(struct net_device *dev, void *p)
88 {
89 	struct net_bridge *br = netdev_priv(dev);
90 	struct sockaddr *addr = p;
91 
92 	if (!is_valid_ether_addr(addr->sa_data))
93 		return -EINVAL;
94 
95 	spin_lock_bh(&br->lock);
96 	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
97 	br_stp_change_bridge_id(br, addr->sa_data);
98 	spin_unlock_bh(&br->lock);
99 
100 	return 0;
101 }
102 
103 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
104 {
105 	strcpy(info->driver, "bridge");
106 	strcpy(info->version, BR_VERSION);
107 	strcpy(info->fw_version, "N/A");
108 	strcpy(info->bus_info, "N/A");
109 }
110 
111 static int br_set_sg(struct net_device *dev, u32 data)
112 {
113 	struct net_bridge *br = netdev_priv(dev);
114 
115 	if (data)
116 		br->feature_mask |= NETIF_F_SG;
117 	else
118 		br->feature_mask &= ~NETIF_F_SG;
119 
120 	br_features_recompute(br);
121 	return 0;
122 }
123 
124 static int br_set_tso(struct net_device *dev, u32 data)
125 {
126 	struct net_bridge *br = netdev_priv(dev);
127 
128 	if (data)
129 		br->feature_mask |= NETIF_F_TSO;
130 	else
131 		br->feature_mask &= ~NETIF_F_TSO;
132 
133 	br_features_recompute(br);
134 	return 0;
135 }
136 
137 static int br_set_tx_csum(struct net_device *dev, u32 data)
138 {
139 	struct net_bridge *br = netdev_priv(dev);
140 
141 	if (data)
142 		br->feature_mask |= NETIF_F_NO_CSUM;
143 	else
144 		br->feature_mask &= ~NETIF_F_ALL_CSUM;
145 
146 	br_features_recompute(br);
147 	return 0;
148 }
149 
150 static struct ethtool_ops br_ethtool_ops = {
151 	.get_drvinfo = br_getinfo,
152 	.get_link = ethtool_op_get_link,
153 	.set_sg = br_set_sg,
154 	.set_tx_csum = br_set_tx_csum,
155 	.set_tso = br_set_tso,
156 };
157 
158 void br_dev_setup(struct net_device *dev)
159 {
160 	random_ether_addr(dev->dev_addr);
161 	ether_setup(dev);
162 
163 	dev->do_ioctl = br_dev_ioctl;
164 	dev->get_stats = br_dev_get_stats;
165 	dev->hard_start_xmit = br_dev_xmit;
166 	dev->open = br_dev_open;
167 	dev->set_multicast_list = br_dev_set_multicast_list;
168 	dev->change_mtu = br_change_mtu;
169 	dev->destructor = free_netdev;
170 	SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
171 	dev->stop = br_dev_stop;
172 	dev->tx_queue_len = 0;
173 	dev->set_mac_address = br_set_mac_address;
174 	dev->priv_flags = IFF_EBRIDGE;
175 
176 	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
177 			NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX;
178 }
179