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/if_vlan.h> 20 #include <linux/kernel.h> 21 #include <linux/netdevice.h> 22 #include <linux/etherdevice.h> 23 #include <linux/ethtool.h> 24 #include <linux/skbuff.h> 25 26 #include <net/dst.h> 27 #include <net/xfrm.h> 28 #include <net/rtnetlink.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 vport_ops ovs_internal_vport_ops; 39 40 static struct internal_dev *internal_dev_priv(struct net_device *netdev) 41 { 42 return netdev_priv(netdev); 43 } 44 45 /* Called with rcu_read_lock_bh. */ 46 static netdev_tx_t 47 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 NETDEV_TX_OK; 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 void internal_dev_destructor(struct net_device *dev) 93 { 94 struct vport *vport = ovs_internal_dev_get_vport(dev); 95 96 ovs_vport_free(vport); 97 } 98 99 static void 100 internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats) 101 { 102 int i; 103 104 memset(stats, 0, sizeof(*stats)); 105 stats->rx_errors = dev->stats.rx_errors; 106 stats->tx_errors = dev->stats.tx_errors; 107 stats->tx_dropped = dev->stats.tx_dropped; 108 stats->rx_dropped = dev->stats.rx_dropped; 109 110 for_each_possible_cpu(i) { 111 const struct pcpu_sw_netstats *percpu_stats; 112 struct pcpu_sw_netstats local_stats; 113 unsigned int start; 114 115 percpu_stats = per_cpu_ptr(dev->tstats, i); 116 117 do { 118 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 119 local_stats = *percpu_stats; 120 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 121 122 stats->rx_bytes += local_stats.rx_bytes; 123 stats->rx_packets += local_stats.rx_packets; 124 stats->tx_bytes += local_stats.tx_bytes; 125 stats->tx_packets += local_stats.tx_packets; 126 } 127 } 128 129 static const struct net_device_ops internal_dev_netdev_ops = { 130 .ndo_open = internal_dev_open, 131 .ndo_stop = internal_dev_stop, 132 .ndo_start_xmit = internal_dev_xmit, 133 .ndo_set_mac_address = eth_mac_addr, 134 .ndo_get_stats64 = internal_get_stats, 135 }; 136 137 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 138 .kind = "openvswitch", 139 }; 140 141 static void do_setup(struct net_device *netdev) 142 { 143 ether_setup(netdev); 144 145 netdev->max_mtu = ETH_MAX_MTU; 146 147 netdev->netdev_ops = &internal_dev_netdev_ops; 148 149 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 150 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH | 151 IFF_NO_QUEUE; 152 netdev->needs_free_netdev = true; 153 netdev->priv_destructor = internal_dev_destructor; 154 netdev->ethtool_ops = &internal_dev_ethtool_ops; 155 netdev->rtnl_link_ops = &internal_dev_link_ops; 156 157 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 158 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 159 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 160 161 netdev->vlan_features = netdev->features; 162 netdev->hw_enc_features = netdev->features; 163 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 164 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 165 166 eth_hw_addr_random(netdev); 167 } 168 169 static struct vport *internal_dev_create(const struct vport_parms *parms) 170 { 171 struct vport *vport; 172 struct internal_dev *internal_dev; 173 struct net_device *dev; 174 int err; 175 bool free_vport = true; 176 177 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 178 if (IS_ERR(vport)) { 179 err = PTR_ERR(vport); 180 goto error; 181 } 182 183 dev = alloc_netdev(sizeof(struct internal_dev), 184 parms->name, NET_NAME_USER, do_setup); 185 vport->dev = dev; 186 if (!vport->dev) { 187 err = -ENOMEM; 188 goto error_free_vport; 189 } 190 vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 191 if (!vport->dev->tstats) { 192 err = -ENOMEM; 193 goto error_free_netdev; 194 } 195 196 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 197 internal_dev = internal_dev_priv(vport->dev); 198 internal_dev->vport = vport; 199 200 /* Restrict bridge port to current netns. */ 201 if (vport->port_no == OVSP_LOCAL) 202 vport->dev->features |= NETIF_F_NETNS_LOCAL; 203 204 rtnl_lock(); 205 err = register_netdevice(vport->dev); 206 if (err) { 207 free_vport = false; 208 goto error_unlock; 209 } 210 211 dev_set_promiscuity(vport->dev, 1); 212 rtnl_unlock(); 213 netif_start_queue(vport->dev); 214 215 return vport; 216 217 error_unlock: 218 rtnl_unlock(); 219 free_percpu(dev->tstats); 220 error_free_netdev: 221 free_netdev(dev); 222 error_free_vport: 223 if (free_vport) 224 ovs_vport_free(vport); 225 error: 226 return ERR_PTR(err); 227 } 228 229 static void internal_dev_destroy(struct vport *vport) 230 { 231 netif_stop_queue(vport->dev); 232 rtnl_lock(); 233 dev_set_promiscuity(vport->dev, -1); 234 235 /* unregister_netdevice() waits for an RCU grace period. */ 236 unregister_netdevice(vport->dev); 237 free_percpu(vport->dev->tstats); 238 rtnl_unlock(); 239 } 240 241 static netdev_tx_t internal_dev_recv(struct sk_buff *skb) 242 { 243 struct net_device *netdev = skb->dev; 244 struct pcpu_sw_netstats *stats; 245 246 if (unlikely(!(netdev->flags & IFF_UP))) { 247 kfree_skb(skb); 248 netdev->stats.rx_dropped++; 249 return NETDEV_TX_OK; 250 } 251 252 skb_dst_drop(skb); 253 nf_reset(skb); 254 secpath_reset(skb); 255 256 skb->pkt_type = PACKET_HOST; 257 skb->protocol = eth_type_trans(skb, netdev); 258 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 259 260 stats = this_cpu_ptr(netdev->tstats); 261 u64_stats_update_begin(&stats->syncp); 262 stats->rx_packets++; 263 stats->rx_bytes += skb->len; 264 u64_stats_update_end(&stats->syncp); 265 266 netif_rx(skb); 267 return NETDEV_TX_OK; 268 } 269 270 static struct vport_ops ovs_internal_vport_ops = { 271 .type = OVS_VPORT_TYPE_INTERNAL, 272 .create = internal_dev_create, 273 .destroy = internal_dev_destroy, 274 .send = internal_dev_recv, 275 }; 276 277 int ovs_is_internal_dev(const struct net_device *netdev) 278 { 279 return netdev->netdev_ops == &internal_dev_netdev_ops; 280 } 281 282 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 283 { 284 if (!ovs_is_internal_dev(netdev)) 285 return NULL; 286 287 return internal_dev_priv(netdev)->vport; 288 } 289 290 int ovs_internal_dev_rtnl_link_register(void) 291 { 292 int err; 293 294 err = rtnl_link_register(&internal_dev_link_ops); 295 if (err < 0) 296 return err; 297 298 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 299 if (err < 0) 300 rtnl_link_unregister(&internal_dev_link_ops); 301 302 return err; 303 } 304 305 void ovs_internal_dev_rtnl_link_unregister(void) 306 { 307 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 308 rtnl_link_unregister(&internal_dev_link_ops); 309 } 310