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datapath: Remove unneeded ovs_netdev_get_ifindex()
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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 #include <linux/version.h>
27
28 #include <net/dst.h>
29 #include <net/xfrm.h>
30
31 #include "checksum.h"
32 #include "datapath.h"
33 #include "vlan.h"
34 #include "vport-internal_dev.h"
35 #include "vport-netdev.h"
36
37 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
38 #define HAVE_NET_DEVICE_OPS
39 #endif
40
41 struct internal_dev {
42 struct vport *vport;
43 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
44 struct net_device_stats stats;
45 #endif
46 };
47
48 static struct internal_dev *internal_dev_priv(struct net_device *netdev)
49 {
50 return netdev_priv(netdev);
51 }
52
53 /* This function is only called by the kernel network layer.*/
54 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
55 static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
56 struct rtnl_link_stats64 *stats)
57 {
58 #else
59 static struct net_device_stats *internal_dev_sys_stats(struct net_device *netdev)
60 {
61 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
62 struct net_device_stats *stats = &internal_dev_priv(netdev)->stats;
63 #else
64 struct net_device_stats *stats = &netdev->stats;
65 #endif
66 #endif
67 struct vport *vport = ovs_internal_dev_get_vport(netdev);
68 struct ovs_vport_stats vport_stats;
69
70 ovs_vport_get_stats(vport, &vport_stats);
71
72 /* The tx and rx stats need to be swapped because the
73 * switch and host OS have opposite perspectives. */
74 stats->rx_packets = vport_stats.tx_packets;
75 stats->tx_packets = vport_stats.rx_packets;
76 stats->rx_bytes = vport_stats.tx_bytes;
77 stats->tx_bytes = vport_stats.rx_bytes;
78 stats->rx_errors = vport_stats.tx_errors;
79 stats->tx_errors = vport_stats.rx_errors;
80 stats->rx_dropped = vport_stats.tx_dropped;
81 stats->tx_dropped = vport_stats.rx_dropped;
82
83 return stats;
84 }
85
86 /* Called with rcu_read_lock_bh. */
87 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
88 {
89 if (unlikely(compute_ip_summed(skb, true))) {
90 kfree_skb(skb);
91 return 0;
92 }
93
94 vlan_copy_skb_tci(skb);
95
96 rcu_read_lock();
97 ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
98 rcu_read_unlock();
99 return 0;
100 }
101
102 static int internal_dev_open(struct net_device *netdev)
103 {
104 netif_start_queue(netdev);
105 return 0;
106 }
107
108 static int internal_dev_stop(struct net_device *netdev)
109 {
110 netif_stop_queue(netdev);
111 return 0;
112 }
113
114 static void internal_dev_getinfo(struct net_device *netdev,
115 struct ethtool_drvinfo *info)
116 {
117 strlcpy(info->driver, "openvswitch", sizeof(info->driver));
118 }
119
120 static const struct ethtool_ops internal_dev_ethtool_ops = {
121 .get_drvinfo = internal_dev_getinfo,
122 .get_link = ethtool_op_get_link,
123 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
124 .get_sg = ethtool_op_get_sg,
125 .set_sg = ethtool_op_set_sg,
126 .get_tx_csum = ethtool_op_get_tx_csum,
127 .set_tx_csum = ethtool_op_set_tx_hw_csum,
128 .get_tso = ethtool_op_get_tso,
129 .set_tso = ethtool_op_set_tso,
130 #endif
131 };
132
133 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
134 {
135 if (new_mtu < 68)
136 return -EINVAL;
137
138 netdev->mtu = new_mtu;
139 return 0;
140 }
141
142 static void internal_dev_destructor(struct net_device *dev)
143 {
144 struct vport *vport = ovs_internal_dev_get_vport(dev);
145
146 ovs_vport_free(vport);
147 free_netdev(dev);
148 }
149
150 #ifdef HAVE_NET_DEVICE_OPS
151 static const struct net_device_ops internal_dev_netdev_ops = {
152 .ndo_open = internal_dev_open,
153 .ndo_stop = internal_dev_stop,
154 .ndo_start_xmit = internal_dev_xmit,
155 .ndo_set_mac_address = eth_mac_addr,
156 .ndo_change_mtu = internal_dev_change_mtu,
157 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
158 .ndo_get_stats64 = internal_dev_get_stats,
159 #else
160 .ndo_get_stats = internal_dev_sys_stats,
161 #endif
162 };
163 #endif
164
165 static void do_setup(struct net_device *netdev)
166 {
167 ether_setup(netdev);
168
169 #ifdef HAVE_NET_DEVICE_OPS
170 netdev->netdev_ops = &internal_dev_netdev_ops;
171 #else
172 netdev->get_stats = internal_dev_sys_stats;
173 netdev->hard_start_xmit = internal_dev_xmit;
174 netdev->open = internal_dev_open;
175 netdev->stop = internal_dev_stop;
176 netdev->set_mac_address = internal_dev_mac_addr;
177 netdev->change_mtu = internal_dev_change_mtu;
178 #endif
179
180 netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
181 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
182 netdev->destructor = internal_dev_destructor;
183 SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
184 netdev->tx_queue_len = 0;
185
186 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
187 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
188
189 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)
190 netdev->vlan_features = netdev->features;
191 netdev->features |= NETIF_F_HW_VLAN_TX;
192 #endif
193
194 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
195 netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
196 #endif
197 eth_hw_addr_random(netdev);
198 }
199
200 static struct vport *internal_dev_create(const struct vport_parms *parms)
201 {
202 struct vport *vport;
203 struct netdev_vport *netdev_vport;
204 struct internal_dev *internal_dev;
205 int err;
206
207 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
208 &ovs_internal_vport_ops, parms);
209 if (IS_ERR(vport)) {
210 err = PTR_ERR(vport);
211 goto error;
212 }
213
214 netdev_vport = netdev_vport_priv(vport);
215
216 netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
217 parms->name, do_setup);
218 if (!netdev_vport->dev) {
219 err = -ENOMEM;
220 goto error_free_vport;
221 }
222
223 dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
224 internal_dev = internal_dev_priv(netdev_vport->dev);
225 internal_dev->vport = vport;
226
227 /* Restrict bridge port to current netns. */
228 if (vport->port_no == OVSP_LOCAL)
229 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
230
231 rtnl_lock();
232 err = register_netdevice(netdev_vport->dev);
233 if (err)
234 goto error_free_netdev;
235
236 dev_set_promiscuity(netdev_vport->dev, 1);
237 rtnl_unlock();
238 netif_start_queue(netdev_vport->dev);
239
240 return vport;
241
242 error_free_netdev:
243 rtnl_unlock();
244 free_netdev(netdev_vport->dev);
245 error_free_vport:
246 ovs_vport_free(vport);
247 error:
248 return ERR_PTR(err);
249 }
250
251 static void internal_dev_destroy(struct vport *vport)
252 {
253 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
254
255 netif_stop_queue(netdev_vport->dev);
256 rtnl_lock();
257 dev_set_promiscuity(netdev_vport->dev, -1);
258
259 /* unregister_netdevice() waits for an RCU grace period. */
260 unregister_netdevice(netdev_vport->dev);
261
262 rtnl_unlock();
263 }
264
265 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
266 {
267 struct net_device *netdev = netdev_vport_priv(vport)->dev;
268 int len;
269
270 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
271 if (unlikely(vlan_deaccel_tag(skb)))
272 return 0;
273 #endif
274
275 len = skb->len;
276
277 skb_dst_drop(skb);
278 nf_reset(skb);
279 secpath_reset(skb);
280
281 skb->dev = netdev;
282 skb->pkt_type = PACKET_HOST;
283 skb->protocol = eth_type_trans(skb, netdev);
284 forward_ip_summed(skb, false);
285
286 netif_rx(skb);
287
288 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
289 netdev->last_rx = jiffies;
290 #endif
291
292 return len;
293 }
294
295 const struct vport_ops ovs_internal_vport_ops = {
296 .type = OVS_VPORT_TYPE_INTERNAL,
297 .flags = VPORT_F_REQUIRED,
298 .create = internal_dev_create,
299 .destroy = internal_dev_destroy,
300 .get_name = ovs_netdev_get_name,
301 .send = internal_dev_recv,
302 };
303
304 int ovs_is_internal_dev(const struct net_device *netdev)
305 {
306 #ifdef HAVE_NET_DEVICE_OPS
307 return netdev->netdev_ops == &internal_dev_netdev_ops;
308 #else
309 return netdev->open == internal_dev_open;
310 #endif
311 }
312
313 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
314 {
315 if (!ovs_is_internal_dev(netdev))
316 return NULL;
317
318 return internal_dev_priv(netdev)->vport;
319 }