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