Jesse Gross | ccb1352 | 2011-10-25 19:26:31 -0700 | [diff] [blame] | 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 | #include <linux/version.h> |
| 27 | |
| 28 | #include "datapath.h" |
| 29 | #include "vport-internal_dev.h" |
| 30 | #include "vport-netdev.h" |
| 31 | |
| 32 | struct internal_dev { |
| 33 | struct vport *vport; |
| 34 | }; |
| 35 | |
| 36 | static struct internal_dev *internal_dev_priv(struct net_device *netdev) |
| 37 | { |
| 38 | return netdev_priv(netdev); |
| 39 | } |
| 40 | |
| 41 | /* This function is only called by the kernel network layer.*/ |
| 42 | static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev, |
| 43 | struct rtnl_link_stats64 *stats) |
| 44 | { |
| 45 | struct vport *vport = ovs_internal_dev_get_vport(netdev); |
| 46 | struct ovs_vport_stats vport_stats; |
| 47 | |
| 48 | ovs_vport_get_stats(vport, &vport_stats); |
| 49 | |
| 50 | /* The tx and rx stats need to be swapped because the |
| 51 | * switch and host OS have opposite perspectives. */ |
| 52 | stats->rx_packets = vport_stats.tx_packets; |
| 53 | stats->tx_packets = vport_stats.rx_packets; |
| 54 | stats->rx_bytes = vport_stats.tx_bytes; |
| 55 | stats->tx_bytes = vport_stats.rx_bytes; |
| 56 | stats->rx_errors = vport_stats.tx_errors; |
| 57 | stats->tx_errors = vport_stats.rx_errors; |
| 58 | stats->rx_dropped = vport_stats.tx_dropped; |
| 59 | stats->tx_dropped = vport_stats.rx_dropped; |
| 60 | |
| 61 | return stats; |
| 62 | } |
| 63 | |
| 64 | static int internal_dev_mac_addr(struct net_device *dev, void *p) |
| 65 | { |
| 66 | struct sockaddr *addr = p; |
| 67 | |
| 68 | if (!is_valid_ether_addr(addr->sa_data)) |
| 69 | return -EADDRNOTAVAIL; |
| 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 | random_ether_addr(netdev->dev_addr); |
| 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 | } |