net/bridge/br_device.c

   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 /* net device transmit always called with no BH (preempt_disabled) */
  25 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
  26 {
  27         struct net_bridge *br = netdev_priv(dev);
  28         const unsigned char *dest = skb->data;
  29         struct net_bridge_fdb_entry *dst;
  30
  31         dev->stats.tx_packets++;
  32         dev->stats.tx_bytes += skb->len;
  33
  34         skb_reset_mac_header(skb);
  35         skb_pull(skb, ETH_HLEN);
  36
  37         if (dest[0] & 1)
  38                 br_flood_deliver(br, skb);
  39         else if ((dst = __br_fdb_get(br, dest)) != NULL)
  40                 br_deliver(dst->dst, skb);
  41         else
  42                 br_flood_deliver(br, skb);
  43
  44         return 0;
  45 }
  46
  47 static int br_dev_open(struct net_device *dev)
  48 {
  49         struct net_bridge *br = netdev_priv(dev);
  50
  51         br_features_recompute(br);
  52         netif_start_queue(dev);
  53         br_stp_enable_bridge(br);
  54
  55         return 0;
  56 }
  57
  58 static void br_dev_set_multicast_list(struct net_device *dev)
  59 {
  60 }
  61
  62 static int br_dev_stop(struct net_device *dev)
  63 {
  64         br_stp_disable_bridge(netdev_priv(dev));
  65
  66         netif_stop_queue(dev);
  67
  68         return 0;
  69 }
  70
  71 static int br_change_mtu(struct net_device *dev, int new_mtu)
  72 {
  73         if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
  74                 return -EINVAL;
  75
  76         dev->mtu = new_mtu;
  77         return 0;
  78 }
  79
  80 /* Allow setting mac address to any valid ethernet address. */
  81 static int br_set_mac_address(struct net_device *dev, void *p)
  82 {
  83         struct net_bridge *br = netdev_priv(dev);
  84         struct sockaddr *addr = p;
  85
  86         if (!is_valid_ether_addr(addr->sa_data))
  87                 return -EINVAL;
  88
  89         spin_lock_bh(&br->lock);
  90         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
  91         br_stp_change_bridge_id(br, addr->sa_data);
  92         spin_unlock_bh(&br->lock);
  93
  94         return 0;
  95 }
  96
  97 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
  98 {
  99         strcpy(info->driver, "bridge");
 100         strcpy(info->version, BR_VERSION);
 101         strcpy(info->fw_version, "N/A");
 102         strcpy(info->bus_info, "N/A");
 103 }
 104
 105 static int br_set_sg(struct net_device *dev, u32 data)
 106 {
 107         struct net_bridge *br = netdev_priv(dev);
 108
 109         if (data)
 110                 br->feature_mask |= NETIF_F_SG;
 111         else
 112                 br->feature_mask &= ~NETIF_F_SG;
 113
 114         br_features_recompute(br);
 115         return 0;
 116 }
 117
 118 static int br_set_tso(struct net_device *dev, u32 data)
 119 {
 120         struct net_bridge *br = netdev_priv(dev);
 121
 122         if (data)
 123                 br->feature_mask |= NETIF_F_TSO;
 124         else
 125                 br->feature_mask &= ~NETIF_F_TSO;
 126
 127         br_features_recompute(br);
 128         return 0;
 129 }
 130
 131 static int br_set_tx_csum(struct net_device *dev, u32 data)
 132 {
 133         struct net_bridge *br = netdev_priv(dev);
 134
 135         if (data)
 136                 br->feature_mask |= NETIF_F_NO_CSUM;
 137         else
 138                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
 139
 140         br_features_recompute(br);
 141         return 0;
 142 }
 143
 144 static struct ethtool_ops br_ethtool_ops = {
 145         .get_drvinfo = br_getinfo,
 146         .get_link = ethtool_op_get_link,
 147         .set_sg = br_set_sg,
 148         .set_tx_csum = br_set_tx_csum,
 149         .set_tso = br_set_tso,
 150 };
 151
 152 void br_dev_setup(struct net_device *dev)
 153 {
 154         random_ether_addr(dev->dev_addr);
 155         ether_setup(dev);
 156
 157         dev->do_ioctl = br_dev_ioctl;
 158         dev->hard_start_xmit = br_dev_xmit;
 159         dev->open = br_dev_open;
 160         dev->set_multicast_list = br_dev_set_multicast_list;
 161         dev->change_mtu = br_change_mtu;
 162         dev->destructor = free_netdev;
 163         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 164         dev->stop = br_dev_stop;
 165         dev->tx_queue_len = 0;
 166         dev->set_mac_address = br_set_mac_address;
 167         dev->priv_flags = IFF_EBRIDGE;
 168
 169         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 170                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX;
 171 }