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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2007-2012 Nicira, Inc.
4 */
5
6#include <linux/if_vlan.h>
7#include <linux/kernel.h>
8#include <linux/netdevice.h>
9#include <linux/etherdevice.h>
10#include <linux/ethtool.h>
11#include <linux/skbuff.h>
12
13#include <net/dst.h>
14#include <net/xfrm.h>
15#include <net/rtnetlink.h>
16
17#include "datapath.h"
18#include "vport-internal_dev.h"
19#include "vport-netdev.h"
20
21struct internal_dev {
22 struct vport *vport;
23};
24
25static struct vport_ops ovs_internal_vport_ops;
26
27static struct internal_dev *internal_dev_priv(struct net_device *netdev)
28{
29 return netdev_priv(netdev);
30}
31
32/* Called with rcu_read_lock_bh. */
33static netdev_tx_t
34internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
35{
36 int len, err;
37
38 len = skb->len;
39 rcu_read_lock();
40 err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
41 rcu_read_unlock();
42
43 if (likely(!err)) {
44 struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
45
46 u64_stats_update_begin(&tstats->syncp);
47 tstats->tx_bytes += len;
48 tstats->tx_packets++;
49 u64_stats_update_end(&tstats->syncp);
50 } else {
51 netdev->stats.tx_errors++;
52 }
53 return NETDEV_TX_OK;
54}
55
56static int internal_dev_open(struct net_device *netdev)
57{
58 netif_start_queue(netdev);
59 return 0;
60}
61
62static int internal_dev_stop(struct net_device *netdev)
63{
64 netif_stop_queue(netdev);
65 return 0;
66}
67
68static void internal_dev_getinfo(struct net_device *netdev,
69 struct ethtool_drvinfo *info)
70{
71 strlcpy(info->driver, "openvswitch", sizeof(info->driver));
72}
73
74static const struct ethtool_ops internal_dev_ethtool_ops = {
75 .get_drvinfo = internal_dev_getinfo,
76 .get_link = ethtool_op_get_link,
77};
78
79static void internal_dev_destructor(struct net_device *dev)
80{
81 struct vport *vport = ovs_internal_dev_get_vport(dev);
82
83 ovs_vport_free(vport);
84}
85
86static void
87internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
88{
89 int i;
90
91 memset(stats, 0, sizeof(*stats));
92 stats->rx_errors = dev->stats.rx_errors;
93 stats->tx_errors = dev->stats.tx_errors;
94 stats->tx_dropped = dev->stats.tx_dropped;
95 stats->rx_dropped = dev->stats.rx_dropped;
96
97 for_each_possible_cpu(i) {
98 const struct pcpu_sw_netstats *percpu_stats;
99 struct pcpu_sw_netstats local_stats;
100 unsigned int start;
101
102 percpu_stats = per_cpu_ptr(dev->tstats, i);
103
104 do {
105 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
106 local_stats = *percpu_stats;
107 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
108
109 stats->rx_bytes += local_stats.rx_bytes;
110 stats->rx_packets += local_stats.rx_packets;
111 stats->tx_bytes += local_stats.tx_bytes;
112 stats->tx_packets += local_stats.tx_packets;
113 }
114}
115
116static const struct net_device_ops internal_dev_netdev_ops = {
117 .ndo_open = internal_dev_open,
118 .ndo_stop = internal_dev_stop,
119 .ndo_start_xmit = internal_dev_xmit,
120 .ndo_set_mac_address = eth_mac_addr,
121 .ndo_get_stats64 = internal_get_stats,
122};
123
124static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
125 .kind = "openvswitch",
126};
127
128static void do_setup(struct net_device *netdev)
129{
130 ether_setup(netdev);
131
132 netdev->max_mtu = ETH_MAX_MTU;
133
134 netdev->netdev_ops = &internal_dev_netdev_ops;
135
136 netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
137 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
138 IFF_NO_QUEUE;
139 netdev->needs_free_netdev = true;
140 netdev->priv_destructor = NULL;
141 netdev->ethtool_ops = &internal_dev_ethtool_ops;
142 netdev->rtnl_link_ops = &internal_dev_link_ops;
143
144 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
145 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
146 NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
147
148 netdev->vlan_features = netdev->features;
149 netdev->hw_enc_features = netdev->features;
150 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
151 netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
152
153 eth_hw_addr_random(netdev);
154}
155
156static struct vport *internal_dev_create(const struct vport_parms *parms)
157{
158 struct vport *vport;
159 struct internal_dev *internal_dev;
160 struct net_device *dev;
161 int err;
162
163 vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
164 if (IS_ERR(vport)) {
165 err = PTR_ERR(vport);
166 goto error;
167 }
168
169 dev = alloc_netdev(sizeof(struct internal_dev),
170 parms->name, NET_NAME_USER, do_setup);
171 vport->dev = dev;
172 if (!vport->dev) {
173 err = -ENOMEM;
174 goto error_free_vport;
175 }
176 vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
177 if (!vport->dev->tstats) {
178 err = -ENOMEM;
179 goto error_free_netdev;
180 }
181
182 dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
183 internal_dev = internal_dev_priv(vport->dev);
184 internal_dev->vport = vport;
185
186 /* Restrict bridge port to current netns. */
187 if (vport->port_no == OVSP_LOCAL)
188 vport->dev->features |= NETIF_F_NETNS_LOCAL;
189
190 rtnl_lock();
191 err = register_netdevice(vport->dev);
192 if (err)
193 goto error_unlock;
194 vport->dev->priv_destructor = internal_dev_destructor;
195
196 dev_set_promiscuity(vport->dev, 1);
197 rtnl_unlock();
198 netif_start_queue(vport->dev);
199
200 return vport;
201
202error_unlock:
203 rtnl_unlock();
204 free_percpu(dev->tstats);
205error_free_netdev:
206 free_netdev(dev);
207error_free_vport:
208 ovs_vport_free(vport);
209error:
210 return ERR_PTR(err);
211}
212
213static void internal_dev_destroy(struct vport *vport)
214{
215 netif_stop_queue(vport->dev);
216 rtnl_lock();
217 dev_set_promiscuity(vport->dev, -1);
218
219 /* unregister_netdevice() waits for an RCU grace period. */
220 unregister_netdevice(vport->dev);
221 free_percpu(vport->dev->tstats);
222 rtnl_unlock();
223}
224
225static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
226{
227 struct net_device *netdev = skb->dev;
228 struct pcpu_sw_netstats *stats;
229
230 if (unlikely(!(netdev->flags & IFF_UP))) {
231 kfree_skb(skb);
232 netdev->stats.rx_dropped++;
233 return NETDEV_TX_OK;
234 }
235
236 skb_dst_drop(skb);
237 nf_reset_ct(skb);
238 secpath_reset(skb);
239
240 skb->pkt_type = PACKET_HOST;
241 skb->protocol = eth_type_trans(skb, netdev);
242 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
243
244 stats = this_cpu_ptr(netdev->tstats);
245 u64_stats_update_begin(&stats->syncp);
246 stats->rx_packets++;
247 stats->rx_bytes += skb->len;
248 u64_stats_update_end(&stats->syncp);
249
250 netif_rx(skb);
251 return NETDEV_TX_OK;
252}
253
254static struct vport_ops ovs_internal_vport_ops = {
255 .type = OVS_VPORT_TYPE_INTERNAL,
256 .create = internal_dev_create,
257 .destroy = internal_dev_destroy,
258 .send = internal_dev_recv,
259};
260
261int ovs_is_internal_dev(const struct net_device *netdev)
262{
263 return netdev->netdev_ops == &internal_dev_netdev_ops;
264}
265
266struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
267{
268 if (!ovs_is_internal_dev(netdev))
269 return NULL;
270
271 return internal_dev_priv(netdev)->vport;
272}
273
274int ovs_internal_dev_rtnl_link_register(void)
275{
276 int err;
277
278 err = rtnl_link_register(&internal_dev_link_ops);
279 if (err < 0)
280 return err;
281
282 err = ovs_vport_ops_register(&ovs_internal_vport_ops);
283 if (err < 0)
284 rtnl_link_unregister(&internal_dev_link_ops);
285
286 return err;
287}
288
289void ovs_internal_dev_rtnl_link_unregister(void)
290{
291 ovs_vport_ops_unregister(&ovs_internal_vport_ops);
292 rtnl_link_unregister(&internal_dev_link_ops);
293}
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
34struct internal_dev {
35 struct vport *vport;
36};
37
38static 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.*/
44static 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/* Called with rcu_read_lock_bh. */
67static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
68{
69 rcu_read_lock();
70 ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
71 rcu_read_unlock();
72 return 0;
73}
74
75static int internal_dev_open(struct net_device *netdev)
76{
77 netif_start_queue(netdev);
78 return 0;
79}
80
81static int internal_dev_stop(struct net_device *netdev)
82{
83 netif_stop_queue(netdev);
84 return 0;
85}
86
87static void internal_dev_getinfo(struct net_device *netdev,
88 struct ethtool_drvinfo *info)
89{
90 strlcpy(info->driver, "openvswitch", sizeof(info->driver));
91}
92
93static const struct ethtool_ops internal_dev_ethtool_ops = {
94 .get_drvinfo = internal_dev_getinfo,
95 .get_link = ethtool_op_get_link,
96};
97
98static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
99{
100 if (new_mtu < 68)
101 return -EINVAL;
102
103 netdev->mtu = new_mtu;
104 return 0;
105}
106
107static void internal_dev_destructor(struct net_device *dev)
108{
109 struct vport *vport = ovs_internal_dev_get_vport(dev);
110
111 ovs_vport_free(vport);
112 free_netdev(dev);
113}
114
115static const struct net_device_ops internal_dev_netdev_ops = {
116 .ndo_open = internal_dev_open,
117 .ndo_stop = internal_dev_stop,
118 .ndo_start_xmit = internal_dev_xmit,
119 .ndo_set_mac_address = eth_mac_addr,
120 .ndo_change_mtu = internal_dev_change_mtu,
121 .ndo_get_stats64 = internal_dev_get_stats,
122};
123
124static void do_setup(struct net_device *netdev)
125{
126 ether_setup(netdev);
127
128 netdev->netdev_ops = &internal_dev_netdev_ops;
129
130 netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
131 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
132 netdev->destructor = internal_dev_destructor;
133 SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
134 netdev->tx_queue_len = 0;
135
136 netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
137 NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;
138
139 netdev->vlan_features = netdev->features;
140 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
141 netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
142 eth_hw_addr_random(netdev);
143}
144
145static struct vport *internal_dev_create(const struct vport_parms *parms)
146{
147 struct vport *vport;
148 struct netdev_vport *netdev_vport;
149 struct internal_dev *internal_dev;
150 int err;
151
152 vport = ovs_vport_alloc(sizeof(struct netdev_vport),
153 &ovs_internal_vport_ops, parms);
154 if (IS_ERR(vport)) {
155 err = PTR_ERR(vport);
156 goto error;
157 }
158
159 netdev_vport = netdev_vport_priv(vport);
160
161 netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
162 parms->name, do_setup);
163 if (!netdev_vport->dev) {
164 err = -ENOMEM;
165 goto error_free_vport;
166 }
167
168 dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
169 internal_dev = internal_dev_priv(netdev_vport->dev);
170 internal_dev->vport = vport;
171
172 /* Restrict bridge port to current netns. */
173 if (vport->port_no == OVSP_LOCAL)
174 netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
175
176 rtnl_lock();
177 err = register_netdevice(netdev_vport->dev);
178 if (err)
179 goto error_free_netdev;
180
181 dev_set_promiscuity(netdev_vport->dev, 1);
182 rtnl_unlock();
183 netif_start_queue(netdev_vport->dev);
184
185 return vport;
186
187error_free_netdev:
188 rtnl_unlock();
189 free_netdev(netdev_vport->dev);
190error_free_vport:
191 ovs_vport_free(vport);
192error:
193 return ERR_PTR(err);
194}
195
196static void internal_dev_destroy(struct vport *vport)
197{
198 struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
199
200 netif_stop_queue(netdev_vport->dev);
201 rtnl_lock();
202 dev_set_promiscuity(netdev_vport->dev, -1);
203
204 /* unregister_netdevice() waits for an RCU grace period. */
205 unregister_netdevice(netdev_vport->dev);
206
207 rtnl_unlock();
208}
209
210static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
211{
212 struct net_device *netdev = netdev_vport_priv(vport)->dev;
213 int len;
214
215 len = skb->len;
216
217 skb_dst_drop(skb);
218 nf_reset(skb);
219 secpath_reset(skb);
220
221 skb->dev = netdev;
222 skb->pkt_type = PACKET_HOST;
223 skb->protocol = eth_type_trans(skb, netdev);
224 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
225
226 netif_rx(skb);
227
228 return len;
229}
230
231const struct vport_ops ovs_internal_vport_ops = {
232 .type = OVS_VPORT_TYPE_INTERNAL,
233 .create = internal_dev_create,
234 .destroy = internal_dev_destroy,
235 .get_name = ovs_netdev_get_name,
236 .send = internal_dev_recv,
237};
238
239int ovs_is_internal_dev(const struct net_device *netdev)
240{
241 return netdev->netdev_ops == &internal_dev_netdev_ops;
242}
243
244struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
245{
246 if (!ovs_is_internal_dev(netdev))
247 return NULL;
248
249 return internal_dev_priv(netdev)->vport;
250}