vport-internal_dev.c revision 7fe99e2d434eafeac0c57b279a77e5de39212636 
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
66static int internal_dev_mac_addr(struct net_device *dev, void *p)
67{
68	struct sockaddr *addr = p;
69
70	if (!is_valid_ether_addr(addr->sa_data))
71		return -EADDRNOTAVAIL;
72	dev->addr_assign_type &= ~NET_ADDR_RANDOM;
73	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
74	return 0;
75}
76
77/* Called with rcu_read_lock_bh. */
78static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
79{
80	rcu_read_lock();
81	ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
82	rcu_read_unlock();
83	return 0;
84}
85
86static int internal_dev_open(struct net_device *netdev)
87{
88	netif_start_queue(netdev);
89	return 0;
90}
91
92static int internal_dev_stop(struct net_device *netdev)
93{
94	netif_stop_queue(netdev);
95	return 0;
96}
97
98static void internal_dev_getinfo(struct net_device *netdev,
99				 struct ethtool_drvinfo *info)
100{
101	strcpy(info->driver, "openvswitch");
102}
103
104static const struct ethtool_ops internal_dev_ethtool_ops = {
105	.get_drvinfo	= internal_dev_getinfo,
106	.get_link	= ethtool_op_get_link,
107};
108
109static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
110{
111	if (new_mtu < 68)
112		return -EINVAL;
113
114	netdev->mtu = new_mtu;
115	return 0;
116}
117
118static void internal_dev_destructor(struct net_device *dev)
119{
120	struct vport *vport = ovs_internal_dev_get_vport(dev);
121
122	ovs_vport_free(vport);
123	free_netdev(dev);
124}
125
126static const struct net_device_ops internal_dev_netdev_ops = {
127	.ndo_open = internal_dev_open,
128	.ndo_stop = internal_dev_stop,
129	.ndo_start_xmit = internal_dev_xmit,
130	.ndo_set_mac_address = internal_dev_mac_addr,
131	.ndo_change_mtu = internal_dev_change_mtu,
132	.ndo_get_stats64 = internal_dev_get_stats,
133};
134
135static void do_setup(struct net_device *netdev)
136{
137	ether_setup(netdev);
138
139	netdev->netdev_ops = &internal_dev_netdev_ops;
140
141	netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
142	netdev->destructor = internal_dev_destructor;
143	SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
144	netdev->tx_queue_len = 0;
145
146	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
147				NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
148
149	netdev->vlan_features = netdev->features;
150	netdev->features |= NETIF_F_HW_VLAN_TX;
151	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
152	eth_hw_addr_random(netdev);
153}
154
155static struct vport *internal_dev_create(const struct vport_parms *parms)
156{
157	struct vport *vport;
158	struct netdev_vport *netdev_vport;
159	struct internal_dev *internal_dev;
160	int err;
161
162	vport = ovs_vport_alloc(sizeof(struct netdev_vport),
163				&ovs_internal_vport_ops, parms);
164	if (IS_ERR(vport)) {
165		err = PTR_ERR(vport);
166		goto error;
167	}
168
169	netdev_vport = netdev_vport_priv(vport);
170
171	netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
172					 parms->name, do_setup);
173	if (!netdev_vport->dev) {
174		err = -ENOMEM;
175		goto error_free_vport;
176	}
177
178	internal_dev = internal_dev_priv(netdev_vport->dev);
179	internal_dev->vport = vport;
180
181	err = register_netdevice(netdev_vport->dev);
182	if (err)
183		goto error_free_netdev;
184
185	dev_set_promiscuity(netdev_vport->dev, 1);
186	netif_start_queue(netdev_vport->dev);
187
188	return vport;
189
190error_free_netdev:
191	free_netdev(netdev_vport->dev);
192error_free_vport:
193	ovs_vport_free(vport);
194error:
195	return ERR_PTR(err);
196}
197
198static void internal_dev_destroy(struct vport *vport)
199{
200	struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
201
202	netif_stop_queue(netdev_vport->dev);
203	dev_set_promiscuity(netdev_vport->dev, -1);
204
205	/* unregister_netdevice() waits for an RCU grace period. */
206	unregister_netdevice(netdev_vport->dev);
207}
208
209static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
210{
211	struct net_device *netdev = netdev_vport_priv(vport)->dev;
212	int len;
213
214	len = skb->len;
215
216	skb_dst_drop(skb);
217	nf_reset(skb);
218	secpath_reset(skb);
219
220	skb->dev = netdev;
221	skb->pkt_type = PACKET_HOST;
222	skb->protocol = eth_type_trans(skb, netdev);
223
224	netif_rx(skb);
225
226	return len;
227}
228
229const struct vport_ops ovs_internal_vport_ops = {
230	.type		= OVS_VPORT_TYPE_INTERNAL,
231	.create		= internal_dev_create,
232	.destroy	= internal_dev_destroy,
233	.get_name	= ovs_netdev_get_name,
234	.get_ifindex	= ovs_netdev_get_ifindex,
235	.send		= internal_dev_recv,
236};
237
238int ovs_is_internal_dev(const struct net_device *netdev)
239{
240	return netdev->netdev_ops == &internal_dev_netdev_ops;
241}
242
243struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
244{
245	if (!ovs_is_internal_dev(netdev))
246		return NULL;
247
248	return internal_dev_priv(netdev)->vport;
249}
250