1 /* 2 * Copyright (c) 2007-2011 Nicira Networks. 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 "datapath.h" 28 #include "vport-internal_dev.h" 29 #include "vport-netdev.h" 30 31 struct internal_dev { 32 struct vport *vport; 33 }; 34 35 static struct internal_dev *internal_dev_priv(struct net_device *netdev) 36 { 37 return netdev_priv(netdev); 38 } 39 40 /* This function is only called by the kernel network layer.*/ 41 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev, 42 struct rtnl_link_stats64 *stats) 43 { 44 struct vport *vport = ovs_internal_dev_get_vport(netdev); 45 struct ovs_vport_stats vport_stats; 46 47 ovs_vport_get_stats(vport, &vport_stats); 48 49 /* The tx and rx stats need to be swapped because the 50 * switch and host OS have opposite perspectives. */ 51 stats->rx_packets = vport_stats.tx_packets; 52 stats->tx_packets = vport_stats.rx_packets; 53 stats->rx_bytes = vport_stats.tx_bytes; 54 stats->tx_bytes = vport_stats.rx_bytes; 55 stats->rx_errors = vport_stats.tx_errors; 56 stats->tx_errors = vport_stats.rx_errors; 57 stats->rx_dropped = vport_stats.tx_dropped; 58 stats->tx_dropped = vport_stats.rx_dropped; 59 60 return stats; 61 } 62 63 static int internal_dev_mac_addr(struct net_device *dev, void *p) 64 { 65 struct sockaddr *addr = p; 66 67 if (!is_valid_ether_addr(addr->sa_data)) 68 return -EADDRNOTAVAIL; 69 dev->addr_assign_type &= ~NET_ADDR_RANDOM; 70 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); 71 return 0; 72 } 73 74 /* Called with rcu_read_lock_bh. */ 75 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) 76 { 77 rcu_read_lock(); 78 ovs_vport_receive(internal_dev_priv(netdev)->vport, skb); 79 rcu_read_unlock(); 80 return 0; 81 } 82 83 static int internal_dev_open(struct net_device *netdev) 84 { 85 netif_start_queue(netdev); 86 return 0; 87 } 88 89 static int internal_dev_stop(struct net_device *netdev) 90 { 91 netif_stop_queue(netdev); 92 return 0; 93 } 94 95 static void internal_dev_getinfo(struct net_device *netdev, 96 struct ethtool_drvinfo *info) 97 { 98 strcpy(info->driver, "openvswitch"); 99 } 100 101 static const struct ethtool_ops internal_dev_ethtool_ops = { 102 .get_drvinfo = internal_dev_getinfo, 103 .get_link = ethtool_op_get_link, 104 }; 105 106 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu) 107 { 108 if (new_mtu < 68) 109 return -EINVAL; 110 111 netdev->mtu = new_mtu; 112 return 0; 113 } 114 115 static void internal_dev_destructor(struct net_device *dev) 116 { 117 struct vport *vport = ovs_internal_dev_get_vport(dev); 118 119 ovs_vport_free(vport); 120 free_netdev(dev); 121 } 122 123 static const struct net_device_ops internal_dev_netdev_ops = { 124 .ndo_open = internal_dev_open, 125 .ndo_stop = internal_dev_stop, 126 .ndo_start_xmit = internal_dev_xmit, 127 .ndo_set_mac_address = internal_dev_mac_addr, 128 .ndo_change_mtu = internal_dev_change_mtu, 129 .ndo_get_stats64 = internal_dev_get_stats, 130 }; 131 132 static void do_setup(struct net_device *netdev) 133 { 134 ether_setup(netdev); 135 136 netdev->netdev_ops = &internal_dev_netdev_ops; 137 138 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 139 netdev->destructor = internal_dev_destructor; 140 SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops); 141 netdev->tx_queue_len = 0; 142 143 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 144 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO; 145 146 netdev->vlan_features = netdev->features; 147 netdev->features |= NETIF_F_HW_VLAN_TX; 148 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 149 eth_hw_addr_random(netdev); 150 } 151 152 static struct vport *internal_dev_create(const struct vport_parms *parms) 153 { 154 struct vport *vport; 155 struct netdev_vport *netdev_vport; 156 struct internal_dev *internal_dev; 157 int err; 158 159 vport = ovs_vport_alloc(sizeof(struct netdev_vport), 160 &ovs_internal_vport_ops, parms); 161 if (IS_ERR(vport)) { 162 err = PTR_ERR(vport); 163 goto error; 164 } 165 166 netdev_vport = netdev_vport_priv(vport); 167 168 netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev), 169 parms->name, do_setup); 170 if (!netdev_vport->dev) { 171 err = -ENOMEM; 172 goto error_free_vport; 173 } 174 175 internal_dev = internal_dev_priv(netdev_vport->dev); 176 internal_dev->vport = vport; 177 178 err = register_netdevice(netdev_vport->dev); 179 if (err) 180 goto error_free_netdev; 181 182 dev_set_promiscuity(netdev_vport->dev, 1); 183 netif_start_queue(netdev_vport->dev); 184 185 return vport; 186 187 error_free_netdev: 188 free_netdev(netdev_vport->dev); 189 error_free_vport: 190 ovs_vport_free(vport); 191 error: 192 return ERR_PTR(err); 193 } 194 195 static void internal_dev_destroy(struct vport *vport) 196 { 197 struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 198 199 netif_stop_queue(netdev_vport->dev); 200 dev_set_promiscuity(netdev_vport->dev, -1); 201 202 /* unregister_netdevice() waits for an RCU grace period. */ 203 unregister_netdevice(netdev_vport->dev); 204 } 205 206 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb) 207 { 208 struct net_device *netdev = netdev_vport_priv(vport)->dev; 209 int len; 210 211 len = skb->len; 212 skb->dev = netdev; 213 skb->pkt_type = PACKET_HOST; 214 skb->protocol = eth_type_trans(skb, netdev); 215 216 netif_rx(skb); 217 218 return len; 219 } 220 221 const struct vport_ops ovs_internal_vport_ops = { 222 .type = OVS_VPORT_TYPE_INTERNAL, 223 .create = internal_dev_create, 224 .destroy = internal_dev_destroy, 225 .get_name = ovs_netdev_get_name, 226 .get_ifindex = ovs_netdev_get_ifindex, 227 .send = internal_dev_recv, 228 }; 229 230 int ovs_is_internal_dev(const struct net_device *netdev) 231 { 232 return netdev->netdev_ops == &internal_dev_netdev_ops; 233 } 234 235 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 236 { 237 if (!ovs_is_internal_dev(netdev)) 238 return NULL; 239 240 return internal_dev_priv(netdev)->vport; 241 } 242