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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#include <net/rtnetlink.h>
30
31#include "datapath.h"
32#include "vport-internal_dev.h"
33#include "vport-netdev.h"
34
35struct internal_dev {
36 struct vport *vport;
37};
38
39static struct vport_ops ovs_internal_vport_ops;
40
41static struct internal_dev *internal_dev_priv(struct net_device *netdev)
42{
43 return netdev_priv(netdev);
44}
45
46
47static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
48{
49 int len, err;
50
51 len = skb->len;
52 rcu_read_lock();
53 err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
54 rcu_read_unlock();
55
56 if (likely(!err)) {
57 struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
58
59 u64_stats_update_begin(&tstats->syncp);
60 tstats->tx_bytes += len;
61 tstats->tx_packets++;
62 u64_stats_update_end(&tstats->syncp);
63 } else {
64 netdev->stats.tx_errors++;
65 }
66 return 0;
67}
68
69static int internal_dev_open(struct net_device *netdev)
70{
71 netif_start_queue(netdev);
72 return 0;
73}
74
75static int internal_dev_stop(struct net_device *netdev)
76{
77 netif_stop_queue(netdev);
78 return 0;
79}
80
81static void internal_dev_getinfo(struct net_device *netdev,
82 struct ethtool_drvinfo *info)
83{
84 strlcpy(info->driver, "openvswitch", sizeof(info->driver));
85}
86
87static const struct ethtool_ops internal_dev_ethtool_ops = {
88 .get_drvinfo = internal_dev_getinfo,
89 .get_link = ethtool_op_get_link,
90};
91
92static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
93{
94 if (new_mtu < 68)
95 return -EINVAL;
96
97 netdev->mtu = new_mtu;
98 return 0;
99}
100
101static void internal_dev_destructor(struct net_device *dev)
102{
103 struct vport *vport = ovs_internal_dev_get_vport(dev);
104
105 ovs_vport_free(vport);
106 free_netdev(dev);
107}
108
109static struct rtnl_link_stats64 *
110internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
111{
112 int i;
113
114 memset(stats, 0, sizeof(*stats));
115 stats->rx_errors = dev->stats.rx_errors;
116 stats->tx_errors = dev->stats.tx_errors;
117 stats->tx_dropped = dev->stats.tx_dropped;
118 stats->rx_dropped = dev->stats.rx_dropped;
119
120 for_each_possible_cpu(i) {
121 const struct pcpu_sw_netstats *percpu_stats;
122 struct pcpu_sw_netstats local_stats;
123 unsigned int start;
124
125 percpu_stats = per_cpu_ptr(dev->tstats, i);
126
127 do {
128 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
129 local_stats = *percpu_stats;
130 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
131
132 stats->rx_bytes += local_stats.rx_bytes;
133 stats->rx_packets += local_stats.rx_packets;
134 stats->tx_bytes += local_stats.tx_bytes;
135 stats->tx_packets += local_stats.tx_packets;
136 }
137
138 return stats;
139}
140
141static void internal_set_rx_headroom(struct net_device *dev, int new_hr)
142{
143 dev->needed_headroom = new_hr < 0 ? 0 : new_hr;
144}
145
146static const struct net_device_ops internal_dev_netdev_ops = {
147 .ndo_open = internal_dev_open,
148 .ndo_stop = internal_dev_stop,
149 .ndo_start_xmit = internal_dev_xmit,
150 .ndo_set_mac_address = eth_mac_addr,
151 .ndo_change_mtu = internal_dev_change_mtu,
152 .ndo_get_stats64 = internal_get_stats,
153 .ndo_set_rx_headroom = internal_set_rx_headroom,
154};
155
156static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
157 .kind = "openvswitch",
158};
159
160static void do_setup(struct net_device *netdev)
161{
162 ether_setup(netdev);
163
164 netdev->netdev_ops = &internal_dev_netdev_ops;
165
166 netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
167 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
168 IFF_PHONY_HEADROOM | IFF_NO_QUEUE;
169 netdev->destructor = internal_dev_destructor;
170 netdev->ethtool_ops = &internal_dev_ethtool_ops;
171 netdev->rtnl_link_ops = &internal_dev_link_ops;
172
173 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
174 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
175 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
176
177 netdev->vlan_features = netdev->features;
178 netdev->hw_enc_features = netdev->features;
179 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
180 netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
181
182 eth_hw_addr_random(netdev);
183}
184
185static struct vport *internal_dev_create(const struct vport_parms *parms)
186{
187 struct vport *vport;
188 struct internal_dev *internal_dev;
189 int err;
190
191 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
192 if (IS_ERR(vport)) {
193 err = PTR_ERR(vport);
194 goto error;
195 }
196
197 vport->dev = alloc_netdev(sizeof(struct internal_dev),
198 parms->name, NET_NAME_USER, do_setup);
199 if (!vport->dev) {
200 err = -ENOMEM;
201 goto error_free_vport;
202 }
203 vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
204 if (!vport->dev->tstats) {
205 err = -ENOMEM;
206 goto error_free_netdev;
207 }
208 vport->dev->needed_headroom = vport->dp->max_headroom;
209
210 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
211 internal_dev = internal_dev_priv(vport->dev);
212 internal_dev->vport = vport;
213
214
215 if (vport->port_no == OVSP_LOCAL)
216 vport->dev->features |= NETIF_F_NETNS_LOCAL;
217
218 rtnl_lock();
219 err = register_netdevice(vport->dev);
220 if (err)
221 goto error_unlock;
222
223 dev_set_promiscuity(vport->dev, 1);
224 rtnl_unlock();
225 netif_start_queue(vport->dev);
226
227 return vport;
228
229error_unlock:
230 rtnl_unlock();
231 free_percpu(vport->dev->tstats);
232error_free_netdev:
233 free_netdev(vport->dev);
234error_free_vport:
235 ovs_vport_free(vport);
236error:
237 return ERR_PTR(err);
238}
239
240static void internal_dev_destroy(struct vport *vport)
241{
242 netif_stop_queue(vport->dev);
243 rtnl_lock();
244 dev_set_promiscuity(vport->dev, -1);
245
246
247 unregister_netdevice(vport->dev);
248 free_percpu(vport->dev->tstats);
249 rtnl_unlock();
250}
251
252static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
253{
254 struct net_device *netdev = skb->dev;
255 struct pcpu_sw_netstats *stats;
256
257 if (unlikely(!(netdev->flags & IFF_UP))) {
258 kfree_skb(skb);
259 netdev->stats.rx_dropped++;
260 return NETDEV_TX_OK;
261 }
262
263 skb_dst_drop(skb);
264 nf_reset(skb);
265 secpath_reset(skb);
266
267 skb->pkt_type = PACKET_HOST;
268 skb->protocol = eth_type_trans(skb, netdev);
269 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
270
271 stats = this_cpu_ptr(netdev->tstats);
272 u64_stats_update_begin(&stats->syncp);
273 stats->rx_packets++;
274 stats->rx_bytes += skb->len;
275 u64_stats_update_end(&stats->syncp);
276
277 netif_rx(skb);
278 return NETDEV_TX_OK;
279}
280
281static struct vport_ops ovs_internal_vport_ops = {
282 .type = OVS_VPORT_TYPE_INTERNAL,
283 .create = internal_dev_create,
284 .destroy = internal_dev_destroy,
285 .send = internal_dev_recv,
286};
287
288int ovs_is_internal_dev(const struct net_device *netdev)
289{
290 return netdev->netdev_ops == &internal_dev_netdev_ops;
291}
292
293struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
294{
295 if (!ovs_is_internal_dev(netdev))
296 return NULL;
297
298 return internal_dev_priv(netdev)->vport;
299}
300
301int ovs_internal_dev_rtnl_link_register(void)
302{
303 int err;
304
305 err = rtnl_link_register(&internal_dev_link_ops);
306 if (err < 0)
307 return err;
308
309 err = ovs_vport_ops_register(&ovs_internal_vport_ops);
310 if (err < 0)
311 rtnl_link_unregister(&internal_dev_link_ops);
312
313 return err;
314}
315
316void ovs_internal_dev_rtnl_link_unregister(void)
317{
318 ovs_vport_ops_unregister(&ovs_internal_vport_ops);
319 rtnl_link_unregister(&internal_dev_link_ops);
320}
321
