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 int i; 90 91 memset(stats, 0, sizeof(*stats)); 92 stats->rx_errors = dev->stats.rx_errors; 93 stats->tx_errors = dev->stats.tx_errors; 94 stats->tx_dropped = dev->stats.tx_dropped; 95 stats->rx_dropped = dev->stats.rx_dropped; 96 97 for_each_possible_cpu(i) { 98 const struct pcpu_sw_netstats *percpu_stats; 99 struct pcpu_sw_netstats local_stats; 100 unsigned int start; 101 102 percpu_stats = per_cpu_ptr(dev->tstats, i); 103 104 do { 105 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); 106 local_stats = *percpu_stats; 107 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); 108 109 stats->rx_bytes += local_stats.rx_bytes; 110 stats->rx_packets += local_stats.rx_packets; 111 stats->tx_bytes += local_stats.tx_bytes; 112 stats->tx_packets += local_stats.tx_packets; 113 } 114 } 115 116 static const struct net_device_ops internal_dev_netdev_ops = { 117 .ndo_open = internal_dev_open, 118 .ndo_stop = internal_dev_stop, 119 .ndo_start_xmit = internal_dev_xmit, 120 .ndo_set_mac_address = eth_mac_addr, 121 .ndo_get_stats64 = internal_get_stats, 122 }; 123 124 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { 125 .kind = "openvswitch", 126 }; 127 128 static void do_setup(struct net_device *netdev) 129 { 130 ether_setup(netdev); 131 132 netdev->max_mtu = ETH_MAX_MTU; 133 134 netdev->netdev_ops = &internal_dev_netdev_ops; 135 136 netdev->priv_flags &= ~IFF_TX_SKB_SHARING; 137 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH | 138 IFF_NO_QUEUE; 139 netdev->needs_free_netdev = true; 140 netdev->priv_destructor = internal_dev_destructor; 141 netdev->ethtool_ops = &internal_dev_ethtool_ops; 142 netdev->rtnl_link_ops = &internal_dev_link_ops; 143 144 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | 145 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | 146 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; 147 148 netdev->vlan_features = netdev->features; 149 netdev->hw_enc_features = netdev->features; 150 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 151 netdev->hw_features = netdev->features & ~NETIF_F_LLTX; 152 153 eth_hw_addr_random(netdev); 154 } 155 156 static struct vport *internal_dev_create(const struct vport_parms *parms) 157 { 158 struct vport *vport; 159 struct internal_dev *internal_dev; 160 struct net_device *dev; 161 int err; 162 bool free_vport = true; 163 164 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); 165 if (IS_ERR(vport)) { 166 err = PTR_ERR(vport); 167 goto error; 168 } 169 170 dev = alloc_netdev(sizeof(struct internal_dev), 171 parms->name, NET_NAME_USER, do_setup); 172 vport->dev = dev; 173 if (!vport->dev) { 174 err = -ENOMEM; 175 goto error_free_vport; 176 } 177 vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 178 if (!vport->dev->tstats) { 179 err = -ENOMEM; 180 goto error_free_netdev; 181 } 182 183 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); 184 internal_dev = internal_dev_priv(vport->dev); 185 internal_dev->vport = vport; 186 187 /* Restrict bridge port to current netns. */ 188 if (vport->port_no == OVSP_LOCAL) 189 vport->dev->features |= NETIF_F_NETNS_LOCAL; 190 191 rtnl_lock(); 192 err = register_netdevice(vport->dev); 193 if (err) { 194 free_vport = false; 195 goto error_unlock; 196 } 197 198 dev_set_promiscuity(vport->dev, 1); 199 rtnl_unlock(); 200 netif_start_queue(vport->dev); 201 202 return vport; 203 204 error_unlock: 205 rtnl_unlock(); 206 free_percpu(dev->tstats); 207 error_free_netdev: 208 free_netdev(dev); 209 error_free_vport: 210 if (free_vport) 211 ovs_vport_free(vport); 212 error: 213 return ERR_PTR(err); 214 } 215 216 static void internal_dev_destroy(struct vport *vport) 217 { 218 netif_stop_queue(vport->dev); 219 rtnl_lock(); 220 dev_set_promiscuity(vport->dev, -1); 221 222 /* unregister_netdevice() waits for an RCU grace period. */ 223 unregister_netdevice(vport->dev); 224 free_percpu(vport->dev->tstats); 225 rtnl_unlock(); 226 } 227 228 static netdev_tx_t internal_dev_recv(struct sk_buff *skb) 229 { 230 struct net_device *netdev = skb->dev; 231 struct pcpu_sw_netstats *stats; 232 233 if (unlikely(!(netdev->flags & IFF_UP))) { 234 kfree_skb(skb); 235 netdev->stats.rx_dropped++; 236 return NETDEV_TX_OK; 237 } 238 239 skb_dst_drop(skb); 240 nf_reset(skb); 241 secpath_reset(skb); 242 243 skb->pkt_type = PACKET_HOST; 244 skb->protocol = eth_type_trans(skb, netdev); 245 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 246 247 stats = this_cpu_ptr(netdev->tstats); 248 u64_stats_update_begin(&stats->syncp); 249 stats->rx_packets++; 250 stats->rx_bytes += skb->len; 251 u64_stats_update_end(&stats->syncp); 252 253 netif_rx(skb); 254 return NETDEV_TX_OK; 255 } 256 257 static struct vport_ops ovs_internal_vport_ops = { 258 .type = OVS_VPORT_TYPE_INTERNAL, 259 .create = internal_dev_create, 260 .destroy = internal_dev_destroy, 261 .send = internal_dev_recv, 262 }; 263 264 int ovs_is_internal_dev(const struct net_device *netdev) 265 { 266 return netdev->netdev_ops == &internal_dev_netdev_ops; 267 } 268 269 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) 270 { 271 if (!ovs_is_internal_dev(netdev)) 272 return NULL; 273 274 return internal_dev_priv(netdev)->vport; 275 } 276 277 int ovs_internal_dev_rtnl_link_register(void) 278 { 279 int err; 280 281 err = rtnl_link_register(&internal_dev_link_ops); 282 if (err < 0) 283 return err; 284 285 err = ovs_vport_ops_register(&ovs_internal_vport_ops); 286 if (err < 0) 287 rtnl_link_unregister(&internal_dev_link_ops); 288 289 return err; 290 } 291 292 void ovs_internal_dev_rtnl_link_unregister(void) 293 { 294 ovs_vport_ops_unregister(&ovs_internal_vport_ops); 295 rtnl_link_unregister(&internal_dev_link_ops); 296 } 297