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 void internal_set_rx_headroom(struct net_device *dev, int new_hr) 142 { 143 dev->needed_headroom = new_hr; 144 } 145 146 static const struct net_device_ops internal_dev_netdev_ops = { 147 .ndo_open = internal_dev_open, 148 .ndo_stop = internal_dev_stop, 149 .ndo_start_xmit = internal_dev_xmit, 150 .ndo_set_mac_address = eth_mac_addr, 151 .ndo_change_mtu = internal_dev_change_mtu, 152 .ndo_get_stats64 = internal_get_stats, 153 .ndo_set_rx_headroom = internal_set_rx_headroom, 154 }; 155 156 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 157 .kind = "openvswitch", 158 }; 159 160 static void do_setup(struct net_device *netdev) 161 { 162 ether_setup(netdev); 163 164 netdev->netdev_ops = &internal_dev_netdev_ops; 165 166 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 167 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH | 168 IFF_PHONY_HEADROOM | IFF_NO_QUEUE; 169 netdev->destructor = internal_dev_destructor; 170 netdev->ethtool_ops = &internal_dev_ethtool_ops; 171 netdev->rtnl_link_ops = &internal_dev_link_ops; 172 173 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 174 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 175 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 176 177 netdev->vlan_features = netdev->features; 178 netdev->hw_enc_features = netdev->features; 179 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX; 180 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 181 182 eth_hw_addr_random(netdev); 183 } 184 185 static struct vport *internal_dev_create(const struct vport_parms *parms) 186 { 187 struct vport *vport; 188 struct internal_dev *internal_dev; 189 int err; 190 191 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 192 if (IS_ERR(vport)) { 193 err = PTR_ERR(vport); 194 goto error; 195 } 196 197 vport->dev = alloc_netdev(sizeof(struct internal_dev), 198 parms->name, NET_NAME_UNKNOWN, do_setup); 199 if (!vport->dev) { 200 err = -ENOMEM; 201 goto error_free_vport; 202 } 203 vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 204 if (!vport->dev->tstats) { 205 err = -ENOMEM; 206 goto error_free_netdev; 207 } 208 vport->dev->needed_headroom = vport->dp->max_headroom; 209 210 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 211 internal_dev = internal_dev_priv(vport->dev); 212 internal_dev->vport = vport; 213 214 /* Restrict bridge port to current netns. */ 215 if (vport->port_no == OVSP_LOCAL) 216 vport->dev->features |= NETIF_F_NETNS_LOCAL; 217 218 rtnl_lock(); 219 err = register_netdevice(vport->dev); 220 if (err) 221 goto error_unlock; 222 223 dev_set_promiscuity(vport->dev, 1); 224 rtnl_unlock(); 225 netif_start_queue(vport->dev); 226 227 return vport; 228 229 error_unlock: 230 rtnl_unlock(); 231 free_percpu(vport->dev->tstats); 232 error_free_netdev: 233 free_netdev(vport->dev); 234 error_free_vport: 235 ovs_vport_free(vport); 236 error: 237 return ERR_PTR(err); 238 } 239 240 static void internal_dev_destroy(struct vport *vport) 241 { 242 netif_stop_queue(vport->dev); 243 rtnl_lock(); 244 dev_set_promiscuity(vport->dev, -1); 245 246 /* unregister_netdevice() waits for an RCU grace period. */ 247 unregister_netdevice(vport->dev); 248 free_percpu(vport->dev->tstats); 249 rtnl_unlock(); 250 } 251 252 static netdev_tx_t internal_dev_recv(struct sk_buff *skb) 253 { 254 struct net_device *netdev = skb->dev; 255 struct pcpu_sw_netstats *stats; 256 257 if (unlikely(!(netdev->flags & IFF_UP))) { 258 kfree_skb(skb); 259 netdev->stats.rx_dropped++; 260 return NETDEV_TX_OK; 261 } 262 263 skb_dst_drop(skb); 264 nf_reset(skb); 265 secpath_reset(skb); 266 267 skb->pkt_type = PACKET_HOST; 268 skb->protocol = eth_type_trans(skb, netdev); 269 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 270 271 stats = this_cpu_ptr(netdev->tstats); 272 u64_stats_update_begin(&stats->syncp); 273 stats->rx_packets++; 274 stats->rx_bytes += skb->len; 275 u64_stats_update_end(&stats->syncp); 276 277 netif_rx(skb); 278 return NETDEV_TX_OK; 279 } 280 281 static struct vport_ops ovs_internal_vport_ops = { 282 .type = OVS_VPORT_TYPE_INTERNAL, 283 .create = internal_dev_create, 284 .destroy = internal_dev_destroy, 285 .send = internal_dev_recv, 286 }; 287 288 int ovs_is_internal_dev(const struct net_device *netdev) 289 { 290 return netdev->netdev_ops == &internal_dev_netdev_ops; 291 } 292 293 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 294 { 295 if (!ovs_is_internal_dev(netdev)) 296 return NULL; 297 298 return internal_dev_priv(netdev)->vport; 299 } 300 301 int ovs_internal_dev_rtnl_link_register(void) 302 { 303 int err; 304 305 err = rtnl_link_register(&internal_dev_link_ops); 306 if (err < 0) 307 return err; 308 309 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 310 if (err < 0) 311 rtnl_link_unregister(&internal_dev_link_ops); 312 313 return err; 314 } 315 316 void ovs_internal_dev_rtnl_link_unregister(void) 317 { 318 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 319 rtnl_link_unregister(&internal_dev_link_ops); 320 } 321