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);
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_TSO;
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
225	netif_rx(skb);
226
227	return len;
228}
229
230const struct vport_ops ovs_internal_vport_ops = {
231	.type		= OVS_VPORT_TYPE_INTERNAL,
232	.create		= internal_dev_create,
233	.destroy	= internal_dev_destroy,
234	.get_name	= ovs_netdev_get_name,
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