summaryrefslogtreecommitdiff
path: root/net/openvswitch/vport-internal_dev.c
blob: 95c36147a6e136b1e11db6bbbb673c4b7f248e1a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
/*
 * Copyright (c) 2007-2012 Nicira, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#include <linux/hardirq.h>
#include <linux/if_vlan.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>

#include <net/dst.h>
#include <net/xfrm.h>
#include <net/rtnetlink.h>

#include "datapath.h"
#include "vport-internal_dev.h"
#include "vport-netdev.h"

struct internal_dev {
	struct vport *vport;
};

static struct vport_ops ovs_internal_vport_ops;

static struct internal_dev *internal_dev_priv(struct net_device *netdev)
{
	return netdev_priv(netdev);
}

/* Called with rcu_read_lock_bh. */
static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
{
	int len, err;

	len = skb->len;
	rcu_read_lock();
	err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
	rcu_read_unlock();

	if (likely(!err)) {
		struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);

		u64_stats_update_begin(&tstats->syncp);
		tstats->tx_bytes += len;
		tstats->tx_packets++;
		u64_stats_update_end(&tstats->syncp);
	} else {
		netdev->stats.tx_errors++;
	}
	return 0;
}

static int internal_dev_open(struct net_device *netdev)
{
	netif_start_queue(netdev);
	return 0;
}

static int internal_dev_stop(struct net_device *netdev)
{
	netif_stop_queue(netdev);
	return 0;
}

static void internal_dev_getinfo(struct net_device *netdev,
				 struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, "openvswitch", sizeof(info->driver));
}

static const struct ethtool_ops internal_dev_ethtool_ops = {
	.get_drvinfo	= internal_dev_getinfo,
	.get_link	= ethtool_op_get_link,
};

static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
{
	if (new_mtu < 68)
		return -EINVAL;

	netdev->mtu = new_mtu;
	return 0;
}

static void internal_dev_destructor(struct net_device *dev)
{
	struct vport *vport = ovs_internal_dev_get_vport(dev);

	ovs_vport_free(vport);
	free_netdev(dev);
}

static struct rtnl_link_stats64 *
internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
	int i;

	memset(stats, 0, sizeof(*stats));
	stats->rx_errors  = dev->stats.rx_errors;
	stats->tx_errors  = dev->stats.tx_errors;
	stats->tx_dropped = dev->stats.tx_dropped;
	stats->rx_dropped = dev->stats.rx_dropped;

	for_each_possible_cpu(i) {
		const struct pcpu_sw_netstats *percpu_stats;
		struct pcpu_sw_netstats local_stats;
		unsigned int start;

		percpu_stats = per_cpu_ptr(dev->tstats, i);

		do {
			start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
			local_stats = *percpu_stats;
		} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));

		stats->rx_bytes         += local_stats.rx_bytes;
		stats->rx_packets       += local_stats.rx_packets;
		stats->tx_bytes         += local_stats.tx_bytes;
		stats->tx_packets       += local_stats.tx_packets;
	}

	return stats;
}

static void internal_set_rx_headroom(struct net_device *dev, int new_hr)
{
	dev->needed_headroom = new_hr < 0 ? 0 : new_hr;
}

static const struct net_device_ops internal_dev_netdev_ops = {
	.ndo_open = internal_dev_open,
	.ndo_stop = internal_dev_stop,
	.ndo_start_xmit = internal_dev_xmit,
	.ndo_set_mac_address = eth_mac_addr,
	.ndo_change_mtu = internal_dev_change_mtu,
	.ndo_get_stats64 = internal_get_stats,
	.ndo_set_rx_headroom = internal_set_rx_headroom,
};

static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
	.kind = "openvswitch",
};

static void do_setup(struct net_device *netdev)
{
	ether_setup(netdev);

	netdev->netdev_ops = &internal_dev_netdev_ops;

	netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
	netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
			      IFF_PHONY_HEADROOM | IFF_NO_QUEUE;
	netdev->destructor = internal_dev_destructor;
	netdev->ethtool_ops = &internal_dev_ethtool_ops;
	netdev->rtnl_link_ops = &internal_dev_link_ops;

	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
			   NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;

	netdev->vlan_features = netdev->features;
	netdev->hw_enc_features = netdev->features;
	netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;
	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;

	eth_hw_addr_random(netdev);
}

static struct vport *internal_dev_create(const struct vport_parms *parms)
{
	struct vport *vport;
	struct internal_dev *internal_dev;
	int err;

	vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
	if (IS_ERR(vport)) {
		err = PTR_ERR(vport);
		goto error;
	}

	vport->dev = alloc_netdev(sizeof(struct internal_dev),
				  parms->name, NET_NAME_USER, do_setup);
	if (!vport->dev) {
		err = -ENOMEM;
		goto error_free_vport;
	}
	vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
	if (!vport->dev->tstats) {
		err = -ENOMEM;
		goto error_free_netdev;
	}
	vport->dev->needed_headroom = vport->dp->max_headroom;

	dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
	internal_dev = internal_dev_priv(vport->dev);
	internal_dev->vport = vport;

	/* Restrict bridge port to current netns. */
	if (vport->port_no == OVSP_LOCAL)
		vport->dev->features |= NETIF_F_NETNS_LOCAL;

	rtnl_lock();
	err = register_netdevice(vport->dev);
	if (err)
		goto error_unlock;

	dev_set_promiscuity(vport->dev, 1);
	rtnl_unlock();
	netif_start_queue(vport->dev);

	return vport;

error_unlock:
	rtnl_unlock();
	free_percpu(vport->dev->tstats);
error_free_netdev:
	free_netdev(vport->dev);
error_free_vport:
	ovs_vport_free(vport);
error:
	return ERR_PTR(err);
}

static void internal_dev_destroy(struct vport *vport)
{
	netif_stop_queue(vport->dev);
	rtnl_lock();
	dev_set_promiscuity(vport->dev, -1);

	/* unregister_netdevice() waits for an RCU grace period. */
	unregister_netdevice(vport->dev);
	free_percpu(vport->dev->tstats);
	rtnl_unlock();
}

static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
{
	struct net_device *netdev = skb->dev;
	struct pcpu_sw_netstats *stats;

	if (unlikely(!(netdev->flags & IFF_UP))) {
		kfree_skb(skb);
		netdev->stats.rx_dropped++;
		return NETDEV_TX_OK;
	}

	skb_dst_drop(skb);
	nf_reset(skb);
	secpath_reset(skb);

	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, netdev);
	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);

	stats = this_cpu_ptr(netdev->tstats);
	u64_stats_update_begin(&stats->syncp);
	stats->rx_packets++;
	stats->rx_bytes += skb->len;
	u64_stats_update_end(&stats->syncp);

	netif_rx(skb);
	return NETDEV_TX_OK;
}

static struct vport_ops ovs_internal_vport_ops = {
	.type		= OVS_VPORT_TYPE_INTERNAL,
	.create		= internal_dev_create,
	.destroy	= internal_dev_destroy,
	.send		= internal_dev_recv,
};

int ovs_is_internal_dev(const struct net_device *netdev)
{
	return netdev->netdev_ops == &internal_dev_netdev_ops;
}

struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
{
	if (!ovs_is_internal_dev(netdev))
		return NULL;

	return internal_dev_priv(netdev)->vport;
}

int ovs_internal_dev_rtnl_link_register(void)
{
	int err;

	err = rtnl_link_register(&internal_dev_link_ops);
	if (err < 0)
		return err;

	err = ovs_vport_ops_register(&ovs_internal_vport_ops);
	if (err < 0)
		rtnl_link_unregister(&internal_dev_link_ops);

	return err;
}

void ovs_internal_dev_rtnl_link_unregister(void)
{
	ovs_vport_ops_unregister(&ovs_internal_vport_ops);
	rtnl_link_unregister(&internal_dev_link_ops);
}