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; 169 netdev->destructor = internal_dev_destructor; 170 netdev->ethtool_ops = &internal_dev_ethtool_ops; 171 netdev->rtnl_link_ops = &internal_dev_link_ops; 172 netdev->tx_queue_len = 0; 173 174 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 175 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 176 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 177 178 netdev->vlan_features = netdev->features; 179 netdev->hw_enc_features = netdev->features; 180 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX; 181 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 182 183 eth_hw_addr_random(netdev); 184 } 185 186 static struct vport *internal_dev_create(const struct vport_parms *parms) 187 { 188 struct vport *vport; 189 struct internal_dev *internal_dev; 190 int err; 191 192 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 193 if (IS_ERR(vport)) { 194 err = PTR_ERR(vport); 195 goto error; 196 } 197 198 vport->dev = alloc_netdev(sizeof(struct internal_dev), 199 parms->name, NET_NAME_UNKNOWN, do_setup); 200 if (!vport->dev) { 201 err = -ENOMEM; 202 goto error_free_vport; 203 } 204 vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 205 if (!vport->dev->tstats) { 206 err = -ENOMEM; 207 goto error_free_netdev; 208 } 209 vport->dev->needed_headroom = vport->dp->max_headroom; 210 211 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 212 internal_dev = internal_dev_priv(vport->dev); 213 internal_dev->vport = vport; 214 215 /* Restrict bridge port to current netns. */ 216 if (vport->port_no == OVSP_LOCAL) 217 vport->dev->features |= NETIF_F_NETNS_LOCAL; 218 219 rtnl_lock(); 220 err = register_netdevice(vport->dev); 221 if (err) 222 goto error_unlock; 223 224 dev_set_promiscuity(vport->dev, 1); 225 rtnl_unlock(); 226 netif_start_queue(vport->dev); 227 228 return vport; 229 230 error_unlock: 231 rtnl_unlock(); 232 free_percpu(vport->dev->tstats); 233 error_free_netdev: 234 free_netdev(vport->dev); 235 error_free_vport: 236 ovs_vport_free(vport); 237 error: 238 return ERR_PTR(err); 239 } 240 241 static void internal_dev_destroy(struct vport *vport) 242 { 243 netif_stop_queue(vport->dev); 244 rtnl_lock(); 245 dev_set_promiscuity(vport->dev, -1); 246 247 /* unregister_netdevice() waits for an RCU grace period. */ 248 unregister_netdevice(vport->dev); 249 free_percpu(vport->dev->tstats); 250 rtnl_unlock(); 251 } 252 253 static netdev_tx_t internal_dev_recv(struct sk_buff *skb) 254 { 255 struct net_device *netdev = skb->dev; 256 struct pcpu_sw_netstats *stats; 257 258 if (unlikely(!(netdev->flags & IFF_UP))) { 259 kfree_skb(skb); 260 netdev->stats.rx_dropped++; 261 return NETDEV_TX_OK; 262 } 263 264 skb_dst_drop(skb); 265 nf_reset(skb); 266 secpath_reset(skb); 267 268 skb->pkt_type = PACKET_HOST; 269 skb->protocol = eth_type_trans(skb, netdev); 270 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 271 272 stats = this_cpu_ptr(netdev->tstats); 273 u64_stats_update_begin(&stats->syncp); 274 stats->rx_packets++; 275 stats->rx_bytes += skb->len; 276 u64_stats_update_end(&stats->syncp); 277 278 netif_rx(skb); 279 return NETDEV_TX_OK; 280 } 281 282 static struct vport_ops ovs_internal_vport_ops = { 283 .type = OVS_VPORT_TYPE_INTERNAL, 284 .create = internal_dev_create, 285 .destroy = internal_dev_destroy, 286 .send = internal_dev_recv, 287 }; 288 289 int ovs_is_internal_dev(const struct net_device *netdev) 290 { 291 return netdev->netdev_ops == &internal_dev_netdev_ops; 292 } 293 294 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 295 { 296 if (!ovs_is_internal_dev(netdev)) 297 return NULL; 298 299 return internal_dev_priv(netdev)->vport; 300 } 301 302 int ovs_internal_dev_rtnl_link_register(void) 303 { 304 int err; 305 306 err = rtnl_link_register(&internal_dev_link_ops); 307 if (err < 0) 308 return err; 309 310 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 311 if (err < 0) 312 rtnl_link_unregister(&internal_dev_link_ops); 313 314 return err; 315 } 316 317 void ovs_internal_dev_rtnl_link_unregister(void) 318 { 319 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 320 rtnl_link_unregister(&internal_dev_link_ops); 321 } 322