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