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