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 #include <net/rtnetlink.h> 30 31 #include "datapath.h" 32 #include "vport-internal_dev.h" 33 #include "vport-netdev.h" 34 35 struct internal_dev { 36 struct vport *vport; 37 }; 38 39 static struct internal_dev *internal_dev_priv(struct net_device *netdev) 40 { 41 return netdev_priv(netdev); 42 } 43 44 /* This function is only called by the kernel network layer.*/ 45 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev, 46 struct rtnl_link_stats64 *stats) 47 { 48 struct vport *vport = ovs_internal_dev_get_vport(netdev); 49 struct ovs_vport_stats vport_stats; 50 51 ovs_vport_get_stats(vport, &vport_stats); 52 53 /* The tx and rx stats need to be swapped because the 54 * switch and host OS have opposite perspectives. */ 55 stats->rx_packets = vport_stats.tx_packets; 56 stats->tx_packets = vport_stats.rx_packets; 57 stats->rx_bytes = vport_stats.tx_bytes; 58 stats->tx_bytes = vport_stats.rx_bytes; 59 stats->rx_errors = vport_stats.tx_errors; 60 stats->tx_errors = vport_stats.rx_errors; 61 stats->rx_dropped = vport_stats.tx_dropped; 62 stats->tx_dropped = vport_stats.rx_dropped; 63 64 return stats; 65 } 66 67 /* Called with rcu_read_lock_bh. */ 68 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) 69 { 70 rcu_read_lock(); 71 ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL); 72 rcu_read_unlock(); 73 return 0; 74 } 75 76 static int internal_dev_open(struct net_device *netdev) 77 { 78 netif_start_queue(netdev); 79 return 0; 80 } 81 82 static int internal_dev_stop(struct net_device *netdev) 83 { 84 netif_stop_queue(netdev); 85 return 0; 86 } 87 88 static void internal_dev_getinfo(struct net_device *netdev, 89 struct ethtool_drvinfo *info) 90 { 91 strlcpy(info->driver, "openvswitch", sizeof(info->driver)); 92 } 93 94 static const struct ethtool_ops internal_dev_ethtool_ops = { 95 .get_drvinfo = internal_dev_getinfo, 96 .get_link = ethtool_op_get_link, 97 }; 98 99 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu) 100 { 101 if (new_mtu < 68) 102 return -EINVAL; 103 104 netdev->mtu = new_mtu; 105 return 0; 106 } 107 108 static void internal_dev_destructor(struct net_device *dev) 109 { 110 struct vport *vport = ovs_internal_dev_get_vport(dev); 111 112 ovs_vport_free(vport); 113 free_netdev(dev); 114 } 115 116 static const struct net_device_ops internal_dev_netdev_ops = { 117 .ndo_open = internal_dev_open, 118 .ndo_stop = internal_dev_stop, 119 .ndo_start_xmit = internal_dev_xmit, 120 .ndo_set_mac_address = eth_mac_addr, 121 .ndo_change_mtu = internal_dev_change_mtu, 122 .ndo_get_stats64 = internal_dev_get_stats, 123 }; 124 125 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 126 .kind = "openvswitch", 127 }; 128 129 static void do_setup(struct net_device *netdev) 130 { 131 ether_setup(netdev); 132 133 netdev->netdev_ops = &internal_dev_netdev_ops; 134 135 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 136 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 137 netdev->destructor = internal_dev_destructor; 138 netdev->ethtool_ops = &internal_dev_ethtool_ops; 139 netdev->rtnl_link_ops = &internal_dev_link_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 | 144 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 145 146 netdev->vlan_features = netdev->features; 147 netdev->hw_enc_features = netdev->features; 148 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX; 149 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 150 151 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, NET_NAME_UNKNOWN, 172 do_setup); 173 if (!netdev_vport->dev) { 174 err = -ENOMEM; 175 goto error_free_vport; 176 } 177 178 dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp)); 179 internal_dev = internal_dev_priv(netdev_vport->dev); 180 internal_dev->vport = vport; 181 182 /* Restrict bridge port to current netns. */ 183 if (vport->port_no == OVSP_LOCAL) 184 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL; 185 186 rtnl_lock(); 187 err = register_netdevice(netdev_vport->dev); 188 if (err) 189 goto error_free_netdev; 190 191 dev_set_promiscuity(netdev_vport->dev, 1); 192 rtnl_unlock(); 193 netif_start_queue(netdev_vport->dev); 194 195 return vport; 196 197 error_free_netdev: 198 rtnl_unlock(); 199 free_netdev(netdev_vport->dev); 200 error_free_vport: 201 ovs_vport_free(vport); 202 error: 203 return ERR_PTR(err); 204 } 205 206 static void internal_dev_destroy(struct vport *vport) 207 { 208 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 209 210 netif_stop_queue(netdev_vport->dev); 211 rtnl_lock(); 212 dev_set_promiscuity(netdev_vport->dev, -1); 213 214 /* unregister_netdevice() waits for an RCU grace period. */ 215 unregister_netdevice(netdev_vport->dev); 216 217 rtnl_unlock(); 218 } 219 220 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb) 221 { 222 struct net_device *netdev = netdev_vport_priv(vport)->dev; 223 int len; 224 225 len = skb->len; 226 227 skb_dst_drop(skb); 228 nf_reset(skb); 229 secpath_reset(skb); 230 231 skb->dev = netdev; 232 skb->pkt_type = PACKET_HOST; 233 skb->protocol = eth_type_trans(skb, netdev); 234 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 235 236 netif_rx(skb); 237 238 return len; 239 } 240 241 const struct vport_ops ovs_internal_vport_ops = { 242 .type = OVS_VPORT_TYPE_INTERNAL, 243 .create = internal_dev_create, 244 .destroy = internal_dev_destroy, 245 .get_name = ovs_netdev_get_name, 246 .send = internal_dev_recv, 247 }; 248 249 int ovs_is_internal_dev(const struct net_device *netdev) 250 { 251 return netdev->netdev_ops == &internal_dev_netdev_ops; 252 } 253 254 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 255 { 256 if (!ovs_is_internal_dev(netdev)) 257 return NULL; 258 259 return internal_dev_priv(netdev)->vport; 260 } 261 262 int ovs_internal_dev_rtnl_link_register(void) 263 { 264 return rtnl_link_register(&internal_dev_link_ops); 265 } 266 267 void ovs_internal_dev_rtnl_link_unregister(void) 268 { 269 rtnl_link_unregister(&internal_dev_link_ops); 270 } 271