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 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 internal_dev *internal_dev_priv(struct net_device *netdev) 39 { 40 return netdev_priv(netdev); 41 } 42 43 /* This function is only called by the kernel network layer.*/ 44 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev, 45 struct rtnl_link_stats64 *stats) 46 { 47 struct vport *vport = ovs_internal_dev_get_vport(netdev); 48 struct ovs_vport_stats vport_stats; 49 50 ovs_vport_get_stats(vport, &vport_stats); 51 52 /* The tx and rx stats need to be swapped because the 53 * switch and host OS have opposite perspectives. */ 54 stats->rx_packets = vport_stats.tx_packets; 55 stats->tx_packets = vport_stats.rx_packets; 56 stats->rx_bytes = vport_stats.tx_bytes; 57 stats->tx_bytes = vport_stats.rx_bytes; 58 stats->rx_errors = vport_stats.tx_errors; 59 stats->tx_errors = vport_stats.rx_errors; 60 stats->rx_dropped = vport_stats.tx_dropped; 61 stats->tx_dropped = vport_stats.rx_dropped; 62 63 return stats; 64 } 65 66 static int internal_dev_mac_addr(struct net_device *dev, void *p) 67 { 68 struct sockaddr *addr = p; 69 70 if (!is_valid_ether_addr(addr->sa_data)) 71 return -EADDRNOTAVAIL; 72 dev->addr_assign_type &= ~NET_ADDR_RANDOM; 73 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); 74 return 0; 75 } 76 77 /* Called with rcu_read_lock_bh. */ 78 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) 79 { 80 rcu_read_lock(); 81 ovs_vport_receive(internal_dev_priv(netdev)->vport, skb); 82 rcu_read_unlock(); 83 return 0; 84 } 85 86 static int internal_dev_open(struct net_device *netdev) 87 { 88 netif_start_queue(netdev); 89 return 0; 90 } 91 92 static int internal_dev_stop(struct net_device *netdev) 93 { 94 netif_stop_queue(netdev); 95 return 0; 96 } 97 98 static void internal_dev_getinfo(struct net_device *netdev, 99 struct ethtool_drvinfo *info) 100 { 101 strcpy(info->driver, "openvswitch"); 102 } 103 104 static const struct ethtool_ops internal_dev_ethtool_ops = { 105 .get_drvinfo = internal_dev_getinfo, 106 .get_link = ethtool_op_get_link, 107 }; 108 109 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu) 110 { 111 if (new_mtu < 68) 112 return -EINVAL; 113 114 netdev->mtu = new_mtu; 115 return 0; 116 } 117 118 static void internal_dev_destructor(struct net_device *dev) 119 { 120 struct vport *vport = ovs_internal_dev_get_vport(dev); 121 122 ovs_vport_free(vport); 123 free_netdev(dev); 124 } 125 126 static const struct net_device_ops internal_dev_netdev_ops = { 127 .ndo_open = internal_dev_open, 128 .ndo_stop = internal_dev_stop, 129 .ndo_start_xmit = internal_dev_xmit, 130 .ndo_set_mac_address = internal_dev_mac_addr, 131 .ndo_change_mtu = internal_dev_change_mtu, 132 .ndo_get_stats64 = internal_dev_get_stats, 133 }; 134 135 static void do_setup(struct net_device *netdev) 136 { 137 ether_setup(netdev); 138 139 netdev->netdev_ops = &internal_dev_netdev_ops; 140 141 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 142 netdev->destructor = internal_dev_destructor; 143 SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops); 144 netdev->tx_queue_len = 0; 145 146 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 147 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO; 148 149 netdev->vlan_features = netdev->features; 150 netdev->features |= NETIF_F_HW_VLAN_TX; 151 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 152 eth_hw_addr_random(netdev); 153 } 154 155 static struct vport *internal_dev_create(const struct vport_parms *parms) 156 { 157 struct vport *vport; 158 struct netdev_vport *netdev_vport; 159 struct internal_dev *internal_dev; 160 int err; 161 162 vport = ovs_vport_alloc(sizeof(struct netdev_vport), 163 &ovs_internal_vport_ops, parms); 164 if (IS_ERR(vport)) { 165 err = PTR_ERR(vport); 166 goto error; 167 } 168 169 netdev_vport = netdev_vport_priv(vport); 170 171 netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev), 172 parms->name, do_setup); 173 if (!netdev_vport->dev) { 174 err = -ENOMEM; 175 goto error_free_vport; 176 } 177 178 internal_dev = internal_dev_priv(netdev_vport->dev); 179 internal_dev->vport = vport; 180 181 err = register_netdevice(netdev_vport->dev); 182 if (err) 183 goto error_free_netdev; 184 185 dev_set_promiscuity(netdev_vport->dev, 1); 186 netif_start_queue(netdev_vport->dev); 187 188 return vport; 189 190 error_free_netdev: 191 free_netdev(netdev_vport->dev); 192 error_free_vport: 193 ovs_vport_free(vport); 194 error: 195 return ERR_PTR(err); 196 } 197 198 static void internal_dev_destroy(struct vport *vport) 199 { 200 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 201 202 netif_stop_queue(netdev_vport->dev); 203 dev_set_promiscuity(netdev_vport->dev, -1); 204 205 /* unregister_netdevice() waits for an RCU grace period. */ 206 unregister_netdevice(netdev_vport->dev); 207 } 208 209 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb) 210 { 211 struct net_device *netdev = netdev_vport_priv(vport)->dev; 212 int len; 213 214 len = skb->len; 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); 223 224 netif_rx(skb); 225 226 return len; 227 } 228 229 const struct vport_ops ovs_internal_vport_ops = { 230 .type = OVS_VPORT_TYPE_INTERNAL, 231 .create = internal_dev_create, 232 .destroy = internal_dev_destroy, 233 .get_name = ovs_netdev_get_name, 234 .get_ifindex = ovs_netdev_get_ifindex, 235 .send = internal_dev_recv, 236 }; 237 238 int ovs_is_internal_dev(const struct net_device *netdev) 239 { 240 return netdev->netdev_ops == &internal_dev_netdev_ops; 241 } 242 243 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 244 { 245 if (!ovs_is_internal_dev(netdev)) 246 return NULL; 247 248 return internal_dev_priv(netdev)->vport; 249 } 250