1 /* 2 * Copyright (c) 2007-2012 Nicira, Inc. 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 <net/dst.h> 28 #include <net/xfrm.h> 29 30 #include "datapath.h" 31 #include "vport-internal_dev.h" 32 #include "vport-netdev.h" 33 34 struct internal_dev { 35 struct vport *vport; 36 }; 37 38 static struct internal_dev *internal_dev_priv(struct net_device *netdev) 39 { 40 return netdev_priv(netdev); 41 } 42 43 /* This function is only called by the kernel network layer.*/ 44 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev, 45 struct rtnl_link_stats64 *stats) 46 { 47 struct vport *vport = ovs_internal_dev_get_vport(netdev); 48 struct ovs_vport_stats vport_stats; 49 50 ovs_vport_get_stats(vport, &vport_stats); 51 52 /* The tx and rx stats need to be swapped because the 53 * switch and host OS have opposite perspectives. */ 54 stats->rx_packets = vport_stats.tx_packets; 55 stats->tx_packets = vport_stats.rx_packets; 56 stats->rx_bytes = vport_stats.tx_bytes; 57 stats->tx_bytes = vport_stats.rx_bytes; 58 stats->rx_errors = vport_stats.tx_errors; 59 stats->tx_errors = vport_stats.rx_errors; 60 stats->rx_dropped = vport_stats.tx_dropped; 61 stats->tx_dropped = vport_stats.rx_dropped; 62 63 return stats; 64 } 65 66 static int internal_dev_mac_addr(struct net_device *dev, void *p) 67 { 68 struct sockaddr *addr = p; 69 70 if (!is_valid_ether_addr(addr->sa_data)) 71 return -EADDRNOTAVAIL; 72 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); 73 return 0; 74 } 75 76 /* Called with rcu_read_lock_bh. */ 77 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) 78 { 79 rcu_read_lock(); 80 ovs_vport_receive(internal_dev_priv(netdev)->vport, skb); 81 rcu_read_unlock(); 82 return 0; 83 } 84 85 static int internal_dev_open(struct net_device *netdev) 86 { 87 netif_start_queue(netdev); 88 return 0; 89 } 90 91 static int internal_dev_stop(struct net_device *netdev) 92 { 93 netif_stop_queue(netdev); 94 return 0; 95 } 96 97 static void internal_dev_getinfo(struct net_device *netdev, 98 struct ethtool_drvinfo *info) 99 { 100 strlcpy(info->driver, "openvswitch", sizeof(info->driver)); 101 } 102 103 static const struct ethtool_ops internal_dev_ethtool_ops = { 104 .get_drvinfo = internal_dev_getinfo, 105 .get_link = ethtool_op_get_link, 106 }; 107 108 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu) 109 { 110 if (new_mtu < 68) 111 return -EINVAL; 112 113 netdev->mtu = new_mtu; 114 return 0; 115 } 116 117 static void internal_dev_destructor(struct net_device *dev) 118 { 119 struct vport *vport = ovs_internal_dev_get_vport(dev); 120 121 ovs_vport_free(vport); 122 free_netdev(dev); 123 } 124 125 static const struct net_device_ops internal_dev_netdev_ops = { 126 .ndo_open = internal_dev_open, 127 .ndo_stop = internal_dev_stop, 128 .ndo_start_xmit = internal_dev_xmit, 129 .ndo_set_mac_address = internal_dev_mac_addr, 130 .ndo_change_mtu = internal_dev_change_mtu, 131 .ndo_get_stats64 = internal_dev_get_stats, 132 }; 133 134 static void do_setup(struct net_device *netdev) 135 { 136 ether_setup(netdev); 137 138 netdev->netdev_ops = &internal_dev_netdev_ops; 139 140 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 141 netdev->destructor = internal_dev_destructor; 142 SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops); 143 netdev->tx_queue_len = 0; 144 145 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 146 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO; 147 148 netdev->vlan_features = netdev->features; 149 netdev->features |= NETIF_F_HW_VLAN_TX; 150 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 151 eth_hw_addr_random(netdev); 152 } 153 154 static struct vport *internal_dev_create(const struct vport_parms *parms) 155 { 156 struct vport *vport; 157 struct netdev_vport *netdev_vport; 158 struct internal_dev *internal_dev; 159 int err; 160 161 vport = ovs_vport_alloc(sizeof(struct netdev_vport), 162 &ovs_internal_vport_ops, parms); 163 if (IS_ERR(vport)) { 164 err = PTR_ERR(vport); 165 goto error; 166 } 167 168 netdev_vport = netdev_vport_priv(vport); 169 170 netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev), 171 parms->name, do_setup); 172 if (!netdev_vport->dev) { 173 err = -ENOMEM; 174 goto error_free_vport; 175 } 176 177 dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp)); 178 internal_dev = internal_dev_priv(netdev_vport->dev); 179 internal_dev->vport = vport; 180 181 /* Restrict bridge port to current netns. */ 182 if (vport->port_no == OVSP_LOCAL) 183 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL; 184 185 err = register_netdevice(netdev_vport->dev); 186 if (err) 187 goto error_free_netdev; 188 189 dev_set_promiscuity(netdev_vport->dev, 1); 190 netif_start_queue(netdev_vport->dev); 191 192 return vport; 193 194 error_free_netdev: 195 free_netdev(netdev_vport->dev); 196 error_free_vport: 197 ovs_vport_free(vport); 198 error: 199 return ERR_PTR(err); 200 } 201 202 static void internal_dev_destroy(struct vport *vport) 203 { 204 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 205 206 netif_stop_queue(netdev_vport->dev); 207 dev_set_promiscuity(netdev_vport->dev, -1); 208 209 /* unregister_netdevice() waits for an RCU grace period. */ 210 unregister_netdevice(netdev_vport->dev); 211 } 212 213 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb) 214 { 215 struct net_device *netdev = netdev_vport_priv(vport)->dev; 216 int len; 217 218 len = skb->len; 219 220 skb_dst_drop(skb); 221 nf_reset(skb); 222 secpath_reset(skb); 223 224 skb->dev = netdev; 225 skb->pkt_type = PACKET_HOST; 226 skb->protocol = eth_type_trans(skb, netdev); 227 228 netif_rx(skb); 229 230 return len; 231 } 232 233 const struct vport_ops ovs_internal_vport_ops = { 234 .type = OVS_VPORT_TYPE_INTERNAL, 235 .create = internal_dev_create, 236 .destroy = internal_dev_destroy, 237 .get_name = ovs_netdev_get_name, 238 .get_ifindex = ovs_netdev_get_ifindex, 239 .send = internal_dev_recv, 240 }; 241 242 int ovs_is_internal_dev(const struct net_device *netdev) 243 { 244 return netdev->netdev_ops == &internal_dev_netdev_ops; 245 } 246 247 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 248 { 249 if (!ovs_is_internal_dev(netdev)) 250 return NULL; 251 252 return internal_dev_priv(netdev)->vport; 253 } 254