1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2012 Nicira, Inc. 4 */ 5 6 #include <linux/if_vlan.h> 7 #include <linux/kernel.h> 8 #include <linux/netdevice.h> 9 #include <linux/etherdevice.h> 10 #include <linux/ethtool.h> 11 #include <linux/skbuff.h> 12 13 #include <net/dst.h> 14 #include <net/xfrm.h> 15 #include <net/rtnetlink.h> 16 17 #include "datapath.h" 18 #include "vport-internal_dev.h" 19 #include "vport-netdev.h" 20 21 struct internal_dev { 22 struct vport *vport; 23 }; 24 25 static struct vport_ops ovs_internal_vport_ops; 26 27 static struct internal_dev *internal_dev_priv(struct net_device *netdev) 28 { 29 return netdev_priv(netdev); 30 } 31 32 /* Called with rcu_read_lock_bh. */ 33 static netdev_tx_t 34 internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) 35 { 36 int len, err; 37 38 len = skb->len; 39 rcu_read_lock(); 40 err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL); 41 rcu_read_unlock(); 42 43 if (likely(!err)) { 44 struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats); 45 46 u64_stats_update_begin(&tstats->syncp); 47 tstats->tx_bytes += len; 48 tstats->tx_packets++; 49 u64_stats_update_end(&tstats->syncp); 50 } else { 51 netdev->stats.tx_errors++; 52 } 53 return NETDEV_TX_OK; 54 } 55 56 static int internal_dev_open(struct net_device *netdev) 57 { 58 netif_start_queue(netdev); 59 return 0; 60 } 61 62 static int internal_dev_stop(struct net_device *netdev) 63 { 64 netif_stop_queue(netdev); 65 return 0; 66 } 67 68 static void internal_dev_getinfo(struct net_device *netdev, 69 struct ethtool_drvinfo *info) 70 { 71 strlcpy(info->driver, "openvswitch", sizeof(info->driver)); 72 } 73 74 static const struct ethtool_ops internal_dev_ethtool_ops = { 75 .get_drvinfo = internal_dev_getinfo, 76 .get_link = ethtool_op_get_link, 77 }; 78 79 static void internal_dev_destructor(struct net_device *dev) 80 { 81 struct vport *vport = ovs_internal_dev_get_vport(dev); 82 83 ovs_vport_free(vport); 84 } 85 86 static void 87 internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats) 88 { 89 memset(stats, 0, sizeof(*stats)); 90 stats->rx_errors = dev->stats.rx_errors; 91 stats->tx_errors = dev->stats.tx_errors; 92 stats->tx_dropped = dev->stats.tx_dropped; 93 stats->rx_dropped = dev->stats.rx_dropped; 94 95 dev_fetch_sw_netstats(stats, dev->tstats); 96 } 97 98 static const struct net_device_ops internal_dev_netdev_ops = { 99 .ndo_open = internal_dev_open, 100 .ndo_stop = internal_dev_stop, 101 .ndo_start_xmit = internal_dev_xmit, 102 .ndo_set_mac_address = eth_mac_addr, 103 .ndo_get_stats64 = internal_get_stats, 104 }; 105 106 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 107 .kind = "openvswitch", 108 }; 109 110 static void do_setup(struct net_device *netdev) 111 { 112 ether_setup(netdev); 113 114 netdev->max_mtu = ETH_MAX_MTU; 115 116 netdev->netdev_ops = &internal_dev_netdev_ops; 117 118 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 119 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH | 120 IFF_NO_QUEUE; 121 netdev->needs_free_netdev = true; 122 netdev->priv_destructor = NULL; 123 netdev->ethtool_ops = &internal_dev_ethtool_ops; 124 netdev->rtnl_link_ops = &internal_dev_link_ops; 125 126 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 127 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 128 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 129 130 netdev->vlan_features = netdev->features; 131 netdev->hw_enc_features = netdev->features; 132 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 133 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 134 135 eth_hw_addr_random(netdev); 136 } 137 138 static struct vport *internal_dev_create(const struct vport_parms *parms) 139 { 140 struct vport *vport; 141 struct internal_dev *internal_dev; 142 struct net_device *dev; 143 int err; 144 145 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 146 if (IS_ERR(vport)) { 147 err = PTR_ERR(vport); 148 goto error; 149 } 150 151 dev = alloc_netdev(sizeof(struct internal_dev), 152 parms->name, NET_NAME_USER, do_setup); 153 vport->dev = dev; 154 if (!vport->dev) { 155 err = -ENOMEM; 156 goto error_free_vport; 157 } 158 vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 159 if (!vport->dev->tstats) { 160 err = -ENOMEM; 161 goto error_free_netdev; 162 } 163 164 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 165 internal_dev = internal_dev_priv(vport->dev); 166 internal_dev->vport = vport; 167 168 /* Restrict bridge port to current netns. */ 169 if (vport->port_no == OVSP_LOCAL) 170 vport->dev->features |= NETIF_F_NETNS_LOCAL; 171 172 rtnl_lock(); 173 err = register_netdevice(vport->dev); 174 if (err) 175 goto error_unlock; 176 vport->dev->priv_destructor = internal_dev_destructor; 177 178 dev_set_promiscuity(vport->dev, 1); 179 rtnl_unlock(); 180 netif_start_queue(vport->dev); 181 182 return vport; 183 184 error_unlock: 185 rtnl_unlock(); 186 free_percpu(dev->tstats); 187 error_free_netdev: 188 free_netdev(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 netif_stop_queue(vport->dev); 198 rtnl_lock(); 199 dev_set_promiscuity(vport->dev, -1); 200 201 /* unregister_netdevice() waits for an RCU grace period. */ 202 unregister_netdevice(vport->dev); 203 free_percpu(vport->dev->tstats); 204 rtnl_unlock(); 205 } 206 207 static netdev_tx_t internal_dev_recv(struct sk_buff *skb) 208 { 209 struct net_device *netdev = skb->dev; 210 211 if (unlikely(!(netdev->flags & IFF_UP))) { 212 kfree_skb(skb); 213 netdev->stats.rx_dropped++; 214 return NETDEV_TX_OK; 215 } 216 217 skb_dst_drop(skb); 218 nf_reset_ct(skb); 219 secpath_reset(skb); 220 221 skb->pkt_type = PACKET_HOST; 222 skb->protocol = eth_type_trans(skb, netdev); 223 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 224 dev_sw_netstats_rx_add(netdev, skb->len); 225 226 netif_rx(skb); 227 return NETDEV_TX_OK; 228 } 229 230 static struct vport_ops ovs_internal_vport_ops = { 231 .type = OVS_VPORT_TYPE_INTERNAL, 232 .create = internal_dev_create, 233 .destroy = internal_dev_destroy, 234 .send = internal_dev_recv, 235 }; 236 237 int ovs_is_internal_dev(const struct net_device *netdev) 238 { 239 return netdev->netdev_ops == &internal_dev_netdev_ops; 240 } 241 242 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 243 { 244 if (!ovs_is_internal_dev(netdev)) 245 return NULL; 246 247 return internal_dev_priv(netdev)->vport; 248 } 249 250 int ovs_internal_dev_rtnl_link_register(void) 251 { 252 int err; 253 254 err = rtnl_link_register(&internal_dev_link_ops); 255 if (err < 0) 256 return err; 257 258 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 259 if (err < 0) 260 rtnl_link_unregister(&internal_dev_link_ops); 261 262 return err; 263 } 264 265 void ovs_internal_dev_rtnl_link_unregister(void) 266 { 267 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 268 rtnl_link_unregister(&internal_dev_link_ops); 269 } 270