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 vport_ops ovs_internal_vport_ops; 40 41 static struct internal_dev *internal_dev_priv(struct net_device *netdev) 42 { 43 return netdev_priv(netdev); 44 } 45 46 /* Called with rcu_read_lock_bh. */ 47 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) 48 { 49 int len, err; 50 51 len = skb->len; 52 rcu_read_lock(); 53 err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL); 54 rcu_read_unlock(); 55 56 if (likely(!err)) { 57 struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats); 58 59 u64_stats_update_begin(&tstats->syncp); 60 tstats->tx_bytes += len; 61 tstats->tx_packets++; 62 u64_stats_update_end(&tstats->syncp); 63 } else { 64 netdev->stats.tx_errors++; 65 } 66 return 0; 67 } 68 69 static int internal_dev_open(struct net_device *netdev) 70 { 71 netif_start_queue(netdev); 72 return 0; 73 } 74 75 static int internal_dev_stop(struct net_device *netdev) 76 { 77 netif_stop_queue(netdev); 78 return 0; 79 } 80 81 static void internal_dev_getinfo(struct net_device *netdev, 82 struct ethtool_drvinfo *info) 83 { 84 strlcpy(info->driver, "openvswitch", sizeof(info->driver)); 85 } 86 87 static const struct ethtool_ops internal_dev_ethtool_ops = { 88 .get_drvinfo = internal_dev_getinfo, 89 .get_link = ethtool_op_get_link, 90 }; 91 92 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu) 93 { 94 if (new_mtu < 68) 95 return -EINVAL; 96 97 netdev->mtu = new_mtu; 98 return 0; 99 } 100 101 static void internal_dev_destructor(struct net_device *dev) 102 { 103 struct vport *vport = ovs_internal_dev_get_vport(dev); 104 105 ovs_vport_free(vport); 106 free_netdev(dev); 107 } 108 109 static struct rtnl_link_stats64 * 110 internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats) 111 { 112 int i; 113 114 memset(stats, 0, sizeof(*stats)); 115 stats->rx_errors = dev->stats.rx_errors; 116 stats->tx_errors = dev->stats.tx_errors; 117 stats->tx_dropped = dev->stats.tx_dropped; 118 stats->rx_dropped = dev->stats.rx_dropped; 119 120 for_each_possible_cpu(i) { 121 const struct pcpu_sw_netstats *percpu_stats; 122 struct pcpu_sw_netstats local_stats; 123 unsigned int start; 124 125 percpu_stats = per_cpu_ptr(dev->tstats, i); 126 127 do { 128 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 129 local_stats = *percpu_stats; 130 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 131 132 stats->rx_bytes += local_stats.rx_bytes; 133 stats->rx_packets += local_stats.rx_packets; 134 stats->tx_bytes += local_stats.tx_bytes; 135 stats->tx_packets += local_stats.tx_packets; 136 } 137 138 return stats; 139 } 140 141 static const struct net_device_ops internal_dev_netdev_ops = { 142 .ndo_open = internal_dev_open, 143 .ndo_stop = internal_dev_stop, 144 .ndo_start_xmit = internal_dev_xmit, 145 .ndo_set_mac_address = eth_mac_addr, 146 .ndo_change_mtu = internal_dev_change_mtu, 147 .ndo_get_stats64 = internal_get_stats, 148 }; 149 150 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 151 .kind = "openvswitch", 152 }; 153 154 static void do_setup(struct net_device *netdev) 155 { 156 ether_setup(netdev); 157 158 netdev->netdev_ops = &internal_dev_netdev_ops; 159 160 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 161 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH; 162 netdev->destructor = internal_dev_destructor; 163 netdev->ethtool_ops = &internal_dev_ethtool_ops; 164 netdev->rtnl_link_ops = &internal_dev_link_ops; 165 netdev->tx_queue_len = 0; 166 167 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 168 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 169 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 170 171 netdev->vlan_features = netdev->features; 172 netdev->hw_enc_features = netdev->features; 173 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX; 174 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 175 176 eth_hw_addr_random(netdev); 177 } 178 179 static struct vport *internal_dev_create(const struct vport_parms *parms) 180 { 181 struct vport *vport; 182 struct internal_dev *internal_dev; 183 int err; 184 185 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 186 if (IS_ERR(vport)) { 187 err = PTR_ERR(vport); 188 goto error; 189 } 190 191 vport->dev = alloc_netdev(sizeof(struct internal_dev), 192 parms->name, NET_NAME_UNKNOWN, do_setup); 193 if (!vport->dev) { 194 err = -ENOMEM; 195 goto error_free_vport; 196 } 197 vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 198 if (!vport->dev->tstats) { 199 err = -ENOMEM; 200 goto error_free_netdev; 201 } 202 203 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 204 internal_dev = internal_dev_priv(vport->dev); 205 internal_dev->vport = vport; 206 207 /* Restrict bridge port to current netns. */ 208 if (vport->port_no == OVSP_LOCAL) 209 vport->dev->features |= NETIF_F_NETNS_LOCAL; 210 211 rtnl_lock(); 212 err = register_netdevice(vport->dev); 213 if (err) 214 goto error_unlock; 215 216 dev_set_promiscuity(vport->dev, 1); 217 rtnl_unlock(); 218 netif_start_queue(vport->dev); 219 220 return vport; 221 222 error_unlock: 223 rtnl_unlock(); 224 free_percpu(vport->dev->tstats); 225 error_free_netdev: 226 free_netdev(vport->dev); 227 error_free_vport: 228 ovs_vport_free(vport); 229 error: 230 return ERR_PTR(err); 231 } 232 233 static void internal_dev_destroy(struct vport *vport) 234 { 235 netif_stop_queue(vport->dev); 236 rtnl_lock(); 237 dev_set_promiscuity(vport->dev, -1); 238 239 /* unregister_netdevice() waits for an RCU grace period. */ 240 unregister_netdevice(vport->dev); 241 free_percpu(vport->dev->tstats); 242 rtnl_unlock(); 243 } 244 245 static void internal_dev_recv(struct vport *vport, struct sk_buff *skb) 246 { 247 struct net_device *netdev = vport->dev; 248 struct pcpu_sw_netstats *stats; 249 250 if (unlikely(!(netdev->flags & IFF_UP))) { 251 kfree_skb(skb); 252 netdev->stats.rx_dropped++; 253 return; 254 } 255 256 skb_dst_drop(skb); 257 nf_reset(skb); 258 secpath_reset(skb); 259 260 skb->dev = netdev; 261 skb->pkt_type = PACKET_HOST; 262 skb->protocol = eth_type_trans(skb, netdev); 263 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 264 265 stats = this_cpu_ptr(netdev->tstats); 266 u64_stats_update_begin(&stats->syncp); 267 stats->rx_packets++; 268 stats->rx_bytes += skb->len; 269 u64_stats_update_end(&stats->syncp); 270 271 netif_rx(skb); 272 } 273 274 static struct vport_ops ovs_internal_vport_ops = { 275 .type = OVS_VPORT_TYPE_INTERNAL, 276 .create = internal_dev_create, 277 .destroy = internal_dev_destroy, 278 .send = internal_dev_recv, 279 }; 280 281 int ovs_is_internal_dev(const struct net_device *netdev) 282 { 283 return netdev->netdev_ops == &internal_dev_netdev_ops; 284 } 285 286 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 287 { 288 if (!ovs_is_internal_dev(netdev)) 289 return NULL; 290 291 return internal_dev_priv(netdev)->vport; 292 } 293 294 int ovs_internal_dev_rtnl_link_register(void) 295 { 296 int err; 297 298 err = rtnl_link_register(&internal_dev_link_ops); 299 if (err < 0) 300 return err; 301 302 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 303 if (err < 0) 304 rtnl_link_unregister(&internal_dev_link_ops); 305 306 return err; 307 } 308 309 void ovs_internal_dev_rtnl_link_unregister(void) 310 { 311 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 312 rtnl_link_unregister(&internal_dev_link_ops); 313 } 314