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