2 * Copyright (c) 2009, 2010 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
9 #include <linux/kernel.h>
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <linux/ethtool.h>
13 #include <linux/preempt.h>
14 #include <linux/rcupdate.h>
15 #include <linux/skbuff.h>
16 #include <linux/workqueue.h>
22 unsigned long rx_packets;
23 unsigned long rx_bytes;
24 unsigned long tx_packets;
25 unsigned long tx_bytes;
28 struct datapath *dp_dev_get_dp(struct net_device *netdev)
30 return dp_dev_priv(netdev)->dp;
33 static struct net_device_stats *dp_dev_get_stats(struct net_device *netdev)
35 struct dp_dev *dp_dev = dp_dev_priv(netdev);
36 struct net_device_stats *stats;
39 stats = &dp_dev->stats;
40 memset(stats, 0, sizeof *stats);
41 for_each_possible_cpu(i) {
42 const struct pcpu_lstats *lb_stats;
44 lb_stats = per_cpu_ptr(dp_dev->lstats, i);
45 stats->rx_bytes += lb_stats->rx_bytes;
46 stats->rx_packets += lb_stats->rx_packets;
47 stats->tx_bytes += lb_stats->tx_bytes;
48 stats->tx_packets += lb_stats->tx_packets;
53 int dp_dev_recv(struct net_device *netdev, struct sk_buff *skb)
55 struct dp_dev *dp_dev = dp_dev_priv(netdev);
56 struct pcpu_lstats *lb_stats;
59 skb->pkt_type = PACKET_HOST;
60 skb->protocol = eth_type_trans(skb, netdev);
65 netdev->last_rx = jiffies;
68 lb_stats = per_cpu_ptr(dp_dev->lstats, smp_processor_id());
69 lb_stats->rx_packets++;
70 lb_stats->rx_bytes += len;
76 static int dp_dev_mac_addr(struct net_device *dev, void *p)
78 struct sockaddr *addr = p;
80 if (!is_valid_ether_addr(addr->sa_data))
81 return -EADDRNOTAVAIL;
82 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
86 /* Not reentrant (because it is called with BHs disabled), but may be called
87 * simultaneously on different CPUs. */
88 static int dp_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
90 struct dp_dev *dp_dev = dp_dev_priv(netdev);
91 struct pcpu_lstats *lb_stats;
93 /* dp_process_received_packet() needs its own clone. */
94 skb = skb_share_check(skb, GFP_ATOMIC);
98 lb_stats = per_cpu_ptr(dp_dev->lstats, smp_processor_id());
99 lb_stats->tx_packets++;
100 lb_stats->tx_bytes += skb->len;
102 skb_reset_mac_header(skb);
104 dp_process_received_packet(skb, dp_dev->dp->ports[dp_dev->port_no]);
105 rcu_read_unlock_bh();
110 static int dp_dev_open(struct net_device *netdev)
112 netif_start_queue(netdev);
116 static int dp_dev_stop(struct net_device *netdev)
118 netif_stop_queue(netdev);
122 static void dp_getinfo(struct net_device *netdev, struct ethtool_drvinfo *info)
124 struct dp_dev *dp_dev = dp_dev_priv(netdev);
125 strcpy(info->driver, "openvswitch");
126 sprintf(info->bus_info, "%d.%d", dp_dev->dp->dp_idx, dp_dev->port_no);
129 static struct ethtool_ops dp_ethtool_ops = {
130 .get_drvinfo = dp_getinfo,
131 .get_link = ethtool_op_get_link,
132 .get_sg = ethtool_op_get_sg,
133 .get_tx_csum = ethtool_op_get_tx_csum,
134 .get_tso = ethtool_op_get_tso,
137 static int dp_dev_change_mtu(struct net_device *dev, int new_mtu)
139 if (new_mtu < 68 || new_mtu > dp_min_mtu(dp_dev_get_dp(dev)))
146 static int dp_dev_init(struct net_device *netdev)
148 struct dp_dev *dp_dev = dp_dev_priv(netdev);
150 dp_dev->lstats = alloc_percpu(struct pcpu_lstats);
157 static void dp_dev_free(struct net_device *netdev)
159 struct dp_dev *dp_dev = dp_dev_priv(netdev);
161 free_percpu(dp_dev->lstats);
165 static int dp_dev_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
168 return dp_ioctl_hook(dev, ifr, cmd);
172 #ifdef HAVE_NET_DEVICE_OPS
173 static const struct net_device_ops dp_dev_netdev_ops = {
174 .ndo_init = dp_dev_init,
175 .ndo_open = dp_dev_open,
176 .ndo_stop = dp_dev_stop,
177 .ndo_start_xmit = dp_dev_xmit,
178 .ndo_set_mac_address = dp_dev_mac_addr,
179 .ndo_do_ioctl = dp_dev_do_ioctl,
180 .ndo_change_mtu = dp_dev_change_mtu,
181 .ndo_get_stats = dp_dev_get_stats,
186 do_setup(struct net_device *netdev)
190 #ifdef HAVE_NET_DEVICE_OPS
191 netdev->netdev_ops = &dp_dev_netdev_ops;
193 netdev->do_ioctl = dp_dev_do_ioctl;
194 netdev->get_stats = dp_dev_get_stats;
195 netdev->hard_start_xmit = dp_dev_xmit;
196 netdev->open = dp_dev_open;
197 netdev->stop = dp_dev_stop;
198 netdev->set_mac_address = dp_dev_mac_addr;
199 netdev->change_mtu = dp_dev_change_mtu;
200 netdev->init = dp_dev_init;
203 netdev->destructor = dp_dev_free;
204 SET_ETHTOOL_OPS(netdev, &dp_ethtool_ops);
205 netdev->tx_queue_len = 0;
207 netdev->flags = IFF_BROADCAST | IFF_MULTICAST;
208 netdev->features = NETIF_F_LLTX; /* XXX other features? */
210 random_ether_addr(netdev->dev_addr);
212 /* Set the OUI to the Nicira one. */
213 netdev->dev_addr[0] = 0x00;
214 netdev->dev_addr[1] = 0x23;
215 netdev->dev_addr[2] = 0x20;
217 /* Set the top bits to indicate random Nicira address. */
218 netdev->dev_addr[3] |= 0xc0;
221 /* Create a datapath device associated with 'dp'. If 'dp_name' is null,
222 * the device name will be of the form 'of<dp_idx>'. Returns the new device or
225 * Called with RTNL lock and dp_mutex. */
226 struct net_device *dp_dev_create(struct datapath *dp, const char *dp_name, int port_no)
228 struct dp_dev *dp_dev;
229 struct net_device *netdev;
230 char dev_name[IFNAMSIZ];
234 if (strlen(dp_name) >= IFNAMSIZ)
235 return ERR_PTR(-EINVAL);
236 strncpy(dev_name, dp_name, sizeof(dev_name));
238 snprintf(dev_name, sizeof dev_name, "of%d", dp->dp_idx);
240 netdev = alloc_netdev(sizeof(struct dp_dev), dev_name, do_setup);
242 return ERR_PTR(-ENOMEM);
244 dp_dev = dp_dev_priv(netdev);
246 dp_dev->port_no = port_no;
247 dp_dev->dev = netdev;
249 err = register_netdevice(netdev);
258 /* Called with RTNL lock and dp_mutex.*/
259 void dp_dev_destroy(struct net_device *netdev)
261 unregister_netdevice(netdev);
264 int is_dp_dev(struct net_device *netdev)
266 #ifdef HAVE_NET_DEVICE_OPS
267 return netdev->netdev_ops == &dp_dev_netdev_ops;
269 return netdev->open == dp_dev_open;