1 /* 2 * Copyright (c) 2007-2011 Nicira Networks. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 16 * 02110-1301, USA 17 */ 18 19 #include <linux/hardirq.h> 20 #include <linux/if_vlan.h> 21 #include <linux/kernel.h> 22 #include <linux/netdevice.h> 23 #include <linux/etherdevice.h> 24 #include <linux/ethtool.h> 25 #include <linux/skbuff.h> 26 27 #include "datapath.h" 28 #include "vport-internal_dev.h" 29 #include "vport-netdev.h" 30 31 struct internal_dev { 32 struct vport *vport; 33 }; 34 35 static struct internal_dev *internal_dev_priv(struct net_device *netdev) 36 { 37 return netdev_priv(netdev); 38 } 39 40 /* This function is only called by the kernel network layer.*/ 41 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev, 42 struct rtnl_link_stats64 *stats) 43 { 44 struct vport *vport = ovs_internal_dev_get_vport(netdev); 45 struct ovs_vport_stats vport_stats; 46 47 ovs_vport_get_stats(vport, &vport_stats); 48 49 /* The tx and rx stats need to be swapped because the 50 * switch and host OS have opposite perspectives. */ 51 stats->rx_packets = vport_stats.tx_packets; 52 stats->tx_packets = vport_stats.rx_packets; 53 stats->rx_bytes = vport_stats.tx_bytes; 54 stats->tx_bytes = vport_stats.rx_bytes; 55 stats->rx_errors = vport_stats.tx_errors; 56 stats->tx_errors = vport_stats.rx_errors; 57 stats->rx_dropped = vport_stats.tx_dropped; 58 stats->tx_dropped = vport_stats.rx_dropped; 59 60 return stats; 61 } 62 63 static int internal_dev_mac_addr(struct net_device *dev, void *p) 64 { 65 struct sockaddr *addr = p; 66 67 if (!is_valid_ether_addr(addr->sa_data)) 68 return -EADDRNOTAVAIL; 69 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); 70 return 0; 71 } 72 73 /* Called with rcu_read_lock_bh. */ 74 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) 75 { 76 rcu_read_lock(); 77 ovs_vport_receive(internal_dev_priv(netdev)->vport, skb); 78 rcu_read_unlock(); 79 return 0; 80 } 81 82 static int internal_dev_open(struct net_device *netdev) 83 { 84 netif_start_queue(netdev); 85 return 0; 86 } 87 88 static int internal_dev_stop(struct net_device *netdev) 89 { 90 netif_stop_queue(netdev); 91 return 0; 92 } 93 94 static void internal_dev_getinfo(struct net_device *netdev, 95 struct ethtool_drvinfo *info) 96 { 97 strcpy(info->driver, "openvswitch"); 98 } 99 100 static const struct ethtool_ops internal_dev_ethtool_ops = { 101 .get_drvinfo = internal_dev_getinfo, 102 .get_link = ethtool_op_get_link, 103 }; 104 105 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu) 106 { 107 if (new_mtu < 68) 108 return -EINVAL; 109 110 netdev->mtu = new_mtu; 111 return 0; 112 } 113 114 static void internal_dev_destructor(struct net_device *dev) 115 { 116 struct vport *vport = ovs_internal_dev_get_vport(dev); 117 118 ovs_vport_free(vport); 119 free_netdev(dev); 120 } 121 122 static const struct net_device_ops internal_dev_netdev_ops = { 123 .ndo_open = internal_dev_open, 124 .ndo_stop = internal_dev_stop, 125 .ndo_start_xmit = internal_dev_xmit, 126 .ndo_set_mac_address = internal_dev_mac_addr, 127 .ndo_change_mtu = internal_dev_change_mtu, 128 .ndo_get_stats64 = internal_dev_get_stats, 129 }; 130 131 static void do_setup(struct net_device *netdev) 132 { 133 ether_setup(netdev); 134 135 netdev->netdev_ops = &internal_dev_netdev_ops; 136 137 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 138 netdev->destructor = internal_dev_destructor; 139 SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops); 140 netdev->tx_queue_len = 0; 141 142 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 143 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO; 144 145 netdev->vlan_features = netdev->features; 146 netdev->features |= NETIF_F_HW_VLAN_TX; 147 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 148 random_ether_addr(netdev->dev_addr); 149 } 150 151 static struct vport *internal_dev_create(const struct vport_parms *parms) 152 { 153 struct vport *vport; 154 struct netdev_vport *netdev_vport; 155 struct internal_dev *internal_dev; 156 int err; 157 158 vport = ovs_vport_alloc(sizeof(struct netdev_vport), 159 &ovs_internal_vport_ops, parms); 160 if (IS_ERR(vport)) { 161 err = PTR_ERR(vport); 162 goto error; 163 } 164 165 netdev_vport = netdev_vport_priv(vport); 166 167 netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev), 168 parms->name, do_setup); 169 if (!netdev_vport->dev) { 170 err = -ENOMEM; 171 goto error_free_vport; 172 } 173 174 internal_dev = internal_dev_priv(netdev_vport->dev); 175 internal_dev->vport = vport; 176 177 err = register_netdevice(netdev_vport->dev); 178 if (err) 179 goto error_free_netdev; 180 181 dev_set_promiscuity(netdev_vport->dev, 1); 182 netif_start_queue(netdev_vport->dev); 183 184 return vport; 185 186 error_free_netdev: 187 free_netdev(netdev_vport->dev); 188 error_free_vport: 189 ovs_vport_free(vport); 190 error: 191 return ERR_PTR(err); 192 } 193 194 static void internal_dev_destroy(struct vport *vport) 195 { 196 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 197 198 netif_stop_queue(netdev_vport->dev); 199 dev_set_promiscuity(netdev_vport->dev, -1); 200 201 /* unregister_netdevice() waits for an RCU grace period. */ 202 unregister_netdevice(netdev_vport->dev); 203 } 204 205 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb) 206 { 207 struct net_device *netdev = netdev_vport_priv(vport)->dev; 208 int len; 209 210 len = skb->len; 211 skb->dev = netdev; 212 skb->pkt_type = PACKET_HOST; 213 skb->protocol = eth_type_trans(skb, netdev); 214 215 netif_rx(skb); 216 217 return len; 218 } 219 220 const struct vport_ops ovs_internal_vport_ops = { 221 .type = OVS_VPORT_TYPE_INTERNAL, 222 .create = internal_dev_create, 223 .destroy = internal_dev_destroy, 224 .get_name = ovs_netdev_get_name, 225 .get_ifindex = ovs_netdev_get_ifindex, 226 .send = internal_dev_recv, 227 }; 228 229 int ovs_is_internal_dev(const struct net_device *netdev) 230 { 231 return netdev->netdev_ops == &internal_dev_netdev_ops; 232 } 233 234 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 235 { 236 if (!ovs_is_internal_dev(netdev)) 237 return NULL; 238 239 return internal_dev_priv(netdev)->vport; 240 } 241