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1 /*
2 * Copyright (c) 2007-2012 Nicira, Inc.
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 <net/dst.h>
28 #include <net/xfrm.h>
29
30 #include "datapath.h"
31 #include "vport-internal_dev.h"
32 #include "vport-netdev.h"
33
34 struct internal_dev {
35 struct vport *vport;
36 };
37
38 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
39 {
40 return netdev_priv(netdev);
41 }
42
43 /* This function is only called by the kernel network layer.*/
44 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
45 struct rtnl_link_stats64 *stats)
46 {
47 struct vport *vport = ovs_internal_dev_get_vport(netdev);
48 struct ovs_vport_stats vport_stats;
49
50 ovs_vport_get_stats(vport, &vport_stats);
51
52 /* The tx and rx stats need to be swapped because the
53 * switch and host OS have opposite perspectives. */
54 stats->rx_packets = vport_stats.tx_packets;
55 stats->tx_packets = vport_stats.rx_packets;
56 stats->rx_bytes = vport_stats.tx_bytes;
57 stats->tx_bytes = vport_stats.rx_bytes;
58 stats->rx_errors = vport_stats.tx_errors;
59 stats->tx_errors = vport_stats.rx_errors;
60 stats->rx_dropped = vport_stats.tx_dropped;
61 stats->tx_dropped = vport_stats.rx_dropped;
62
63 return stats;
64 }
65
66 static int internal_dev_mac_addr(struct net_device *dev, void *p)
67 {
68 struct sockaddr *addr = p;
69
70 if (!is_valid_ether_addr(addr->sa_data))
71 return -EADDRNOTAVAIL;
72 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
73 return 0;
74 }
75
76 /* Called with rcu_read_lock_bh. */
77 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
78 {
79 rcu_read_lock();
80 ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
81 rcu_read_unlock();
82 return 0;
83 }
84
85 static int internal_dev_open(struct net_device *netdev)
86 {
87 netif_start_queue(netdev);
88 return 0;
89 }
90
91 static int internal_dev_stop(struct net_device *netdev)
92 {
93 netif_stop_queue(netdev);
94 return 0;
95 }
96
97 static void internal_dev_getinfo(struct net_device *netdev,
98 struct ethtool_drvinfo *info)
99 {
100 strlcpy(info->driver, "openvswitch", sizeof(info->driver));
101 }
102
103 static const struct ethtool_ops internal_dev_ethtool_ops = {
104 .get_drvinfo = internal_dev_getinfo,
105 .get_link = ethtool_op_get_link,
106 };
107
108 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
109 {
110 if (new_mtu < 68)
111 return -EINVAL;
112
113 netdev->mtu = new_mtu;
114 return 0;
115 }
116
117 static void internal_dev_destructor(struct net_device *dev)
118 {
119 struct vport *vport = ovs_internal_dev_get_vport(dev);
120
121 ovs_vport_free(vport);
122 free_netdev(dev);
123 }
124
125 static const struct net_device_ops internal_dev_netdev_ops = {
126 .ndo_open = internal_dev_open,
127 .ndo_stop = internal_dev_stop,
128 .ndo_start_xmit = internal_dev_xmit,
129 .ndo_set_mac_address = internal_dev_mac_addr,
130 .ndo_change_mtu = internal_dev_change_mtu,
131 .ndo_get_stats64 = internal_dev_get_stats,
132 };
133
134 static void do_setup(struct net_device *netdev)
135 {
136 ether_setup(netdev);
137
138 netdev->netdev_ops = &internal_dev_netdev_ops;
139
140 netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
141 netdev->destructor = internal_dev_destructor;
142 SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
143 netdev->tx_queue_len = 0;
144
145 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
146 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
147
148 netdev->vlan_features = netdev->features;
149 netdev->features |= NETIF_F_HW_VLAN_TX;
150 netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
151 eth_hw_addr_random(netdev);
152 }
153
154 static struct vport *internal_dev_create(const struct vport_parms *parms)
155 {
156 struct vport *vport;
157 struct netdev_vport *netdev_vport;
158 struct internal_dev *internal_dev;
159 int err;
160
161 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
162 &ovs_internal_vport_ops, parms);
163 if (IS_ERR(vport)) {
164 err = PTR_ERR(vport);
165 goto error;
166 }
167
168 netdev_vport = netdev_vport_priv(vport);
169
170 netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
171 parms->name, do_setup);
172 if (!netdev_vport->dev) {
173 err = -ENOMEM;
174 goto error_free_vport;
175 }
176
177 dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
178 internal_dev = internal_dev_priv(netdev_vport->dev);
179 internal_dev->vport = vport;
180
181 /* Restrict bridge port to current netns. */
182 if (vport->port_no == OVSP_LOCAL)
183 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
184
185 err = register_netdevice(netdev_vport->dev);
186 if (err)
187 goto error_free_netdev;
188
189 dev_set_promiscuity(netdev_vport->dev, 1);
190 netif_start_queue(netdev_vport->dev);
191
192 return vport;
193
194 error_free_netdev:
195 free_netdev(netdev_vport->dev);
196 error_free_vport:
197 ovs_vport_free(vport);
198 error:
199 return ERR_PTR(err);
200 }
201
202 static void internal_dev_destroy(struct vport *vport)
203 {
204 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
205
206 netif_stop_queue(netdev_vport->dev);
207 dev_set_promiscuity(netdev_vport->dev, -1);
208
209 /* unregister_netdevice() waits for an RCU grace period. */
210 unregister_netdevice(netdev_vport->dev);
211 }
212
213 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
214 {
215 struct net_device *netdev = netdev_vport_priv(vport)->dev;
216 int len;
217
218 len = skb->len;
219
220 skb_dst_drop(skb);
221 nf_reset(skb);
222 secpath_reset(skb);
223
224 skb->dev = netdev;
225 skb->pkt_type = PACKET_HOST;
226 skb->protocol = eth_type_trans(skb, netdev);
227
228 netif_rx(skb);
229
230 return len;
231 }
232
233 const struct vport_ops ovs_internal_vport_ops = {
234 .type = OVS_VPORT_TYPE_INTERNAL,
235 .create = internal_dev_create,
236 .destroy = internal_dev_destroy,
237 .get_name = ovs_netdev_get_name,
238 .get_ifindex = ovs_netdev_get_ifindex,
239 .send = internal_dev_recv,
240 };
241
242 int ovs_is_internal_dev(const struct net_device *netdev)
243 {
244 return netdev->netdev_ops == &internal_dev_netdev_ops;
245 }
246
247 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
248 {
249 if (!ovs_is_internal_dev(netdev))
250 return NULL;
251
252 return internal_dev_priv(netdev)->vport;
253 }