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
34 struct internal_dev {
35 struct vport *vport;
36 };
37
internal_dev_priv(struct net_device * netdev)38 static 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.*/
internal_dev_get_stats(struct net_device * netdev,struct rtnl_link_stats64 * stats)44 static 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. */
internal_dev_xmit(struct sk_buff * skb,struct net_device * netdev)67 static 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
internal_dev_open(struct net_device * netdev)75 static int internal_dev_open(struct net_device *netdev)
76 {
77 netif_start_queue(netdev);
78 return 0;
79 }
80
internal_dev_stop(struct net_device * netdev)81 static int internal_dev_stop(struct net_device *netdev)
82 {
83 netif_stop_queue(netdev);
84 return 0;
85 }
86
internal_dev_getinfo(struct net_device * netdev,struct ethtool_drvinfo * info)87 static void internal_dev_getinfo(struct net_device *netdev,
88 struct ethtool_drvinfo *info)
89 {
90 strlcpy(info->driver, "openvswitch", sizeof(info->driver));
91 }
92
93 static const struct ethtool_ops internal_dev_ethtool_ops = {
94 .get_drvinfo = internal_dev_getinfo,
95 .get_link = ethtool_op_get_link,
96 };
97
internal_dev_change_mtu(struct net_device * netdev,int new_mtu)98 static 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
internal_dev_destructor(struct net_device * dev)107 static 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
115 static 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
do_setup(struct net_device * netdev)124 static 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
internal_dev_create(const struct vport_parms * parms)145 static 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
187 error_free_netdev:
188 rtnl_unlock();
189 free_netdev(netdev_vport->dev);
190 error_free_vport:
191 ovs_vport_free(vport);
192 error:
193 return ERR_PTR(err);
194 }
195
internal_dev_destroy(struct vport * vport)196 static 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
internal_dev_recv(struct vport * vport,struct sk_buff * skb)210 static 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
230 const 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
ovs_is_internal_dev(const struct net_device * netdev)238 int ovs_is_internal_dev(const struct net_device *netdev)
239 {
240 return netdev->netdev_ops == &internal_dev_netdev_ops;
241 }
242
ovs_internal_dev_get_vport(struct net_device * netdev)243 struct 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