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 const struct net_device_ops internal_dev_netdev_ops = { 110 .ndo_open = internal_dev_open, 111 .ndo_stop = internal_dev_stop, 112 .ndo_start_xmit = internal_dev_xmit, 113 .ndo_set_mac_address = eth_mac_addr, 114 .ndo_change_mtu = internal_dev_change_mtu, 115 }; 116 117 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 118 .kind = "openvswitch", 119 }; 120 121 static void do_setup(struct net_device *netdev) 122 { 123 ether_setup(netdev); 124 125 netdev->netdev_ops = &internal_dev_netdev_ops; 126 127 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 128 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH; 129 netdev->destructor = internal_dev_destructor; 130 netdev->ethtool_ops = &internal_dev_ethtool_ops; 131 netdev->rtnl_link_ops = &internal_dev_link_ops; 132 netdev->tx_queue_len = 0; 133 134 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 135 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 136 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 137 138 netdev->vlan_features = netdev->features; 139 netdev->hw_enc_features = netdev->features; 140 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX; 141 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 142 143 eth_hw_addr_random(netdev); 144 } 145 146 static struct vport *internal_dev_create(const struct vport_parms *parms) 147 { 148 struct vport *vport; 149 struct internal_dev *internal_dev; 150 int err; 151 152 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 153 if (IS_ERR(vport)) { 154 err = PTR_ERR(vport); 155 goto error; 156 } 157 158 vport->dev = alloc_netdev(sizeof(struct internal_dev), 159 parms->name, NET_NAME_UNKNOWN, do_setup); 160 if (!vport->dev) { 161 err = -ENOMEM; 162 goto error_free_vport; 163 } 164 165 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 166 internal_dev = internal_dev_priv(vport->dev); 167 internal_dev->vport = vport; 168 169 /* Restrict bridge port to current netns. */ 170 if (vport->port_no == OVSP_LOCAL) 171 vport->dev->features |= NETIF_F_NETNS_LOCAL; 172 173 rtnl_lock(); 174 err = register_netdevice(vport->dev); 175 if (err) 176 goto error_free_netdev; 177 178 dev_set_promiscuity(vport->dev, 1); 179 rtnl_unlock(); 180 netif_start_queue(vport->dev); 181 182 return vport; 183 184 error_free_netdev: 185 rtnl_unlock(); 186 free_netdev(vport->dev); 187 error_free_vport: 188 ovs_vport_free(vport); 189 error: 190 return ERR_PTR(err); 191 } 192 193 static void internal_dev_destroy(struct vport *vport) 194 { 195 netif_stop_queue(vport->dev); 196 rtnl_lock(); 197 dev_set_promiscuity(vport->dev, -1); 198 199 /* unregister_netdevice() waits for an RCU grace period. */ 200 unregister_netdevice(vport->dev); 201 202 rtnl_unlock(); 203 } 204 205 static void internal_dev_recv(struct vport *vport, struct sk_buff *skb) 206 { 207 struct net_device *netdev = vport->dev; 208 struct pcpu_sw_netstats *stats; 209 210 if (unlikely(!(netdev->flags & IFF_UP))) { 211 kfree_skb(skb); 212 netdev->stats.rx_dropped++; 213 return; 214 } 215 216 skb_dst_drop(skb); 217 nf_reset(skb); 218 secpath_reset(skb); 219 220 skb->dev = netdev; 221 skb->pkt_type = PACKET_HOST; 222 skb->protocol = eth_type_trans(skb, netdev); 223 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 224 225 stats = this_cpu_ptr(netdev->tstats); 226 u64_stats_update_begin(&stats->syncp); 227 stats->rx_packets++; 228 stats->rx_bytes += skb->len; 229 u64_stats_update_end(&stats->syncp); 230 231 netif_rx(skb); 232 } 233 234 static struct vport_ops ovs_internal_vport_ops = { 235 .type = OVS_VPORT_TYPE_INTERNAL, 236 .create = internal_dev_create, 237 .destroy = internal_dev_destroy, 238 .send = internal_dev_recv, 239 }; 240 241 int ovs_is_internal_dev(const struct net_device *netdev) 242 { 243 return netdev->netdev_ops == &internal_dev_netdev_ops; 244 } 245 246 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 247 { 248 if (!ovs_is_internal_dev(netdev)) 249 return NULL; 250 251 return internal_dev_priv(netdev)->vport; 252 } 253 254 int ovs_internal_dev_rtnl_link_register(void) 255 { 256 int err; 257 258 err = rtnl_link_register(&internal_dev_link_ops); 259 if (err < 0) 260 return err; 261 262 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 263 if (err < 0) 264 rtnl_link_unregister(&internal_dev_link_ops); 265 266 return err; 267 } 268 269 void ovs_internal_dev_rtnl_link_unregister(void) 270 { 271 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 272 rtnl_link_unregister(&internal_dev_link_ops); 273 } 274