1 /*
2 * Copyright (c) 2007-2011 Nicira Networks.
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
internal_dev_mac_addr(struct net_device * dev,void * p)66 static 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. */
internal_dev_xmit(struct sk_buff * skb,struct net_device * netdev)78 static 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
internal_dev_open(struct net_device * netdev)86 static int internal_dev_open(struct net_device *netdev)
87 {
88 netif_start_queue(netdev);
89 return 0;
90 }
91
internal_dev_stop(struct net_device * netdev)92 static int internal_dev_stop(struct net_device *netdev)
93 {
94 netif_stop_queue(netdev);
95 return 0;
96 }
97
internal_dev_getinfo(struct net_device * netdev,struct ethtool_drvinfo * info)98 static void internal_dev_getinfo(struct net_device *netdev,
99 struct ethtool_drvinfo *info)
100 {
101 strcpy(info->driver, "openvswitch");
102 }
103
104 static const struct ethtool_ops internal_dev_ethtool_ops = {
105 .get_drvinfo = internal_dev_getinfo,
106 .get_link = ethtool_op_get_link,
107 };
108
internal_dev_change_mtu(struct net_device * netdev,int new_mtu)109 static 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
internal_dev_destructor(struct net_device * dev)118 static 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
126 static 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
do_setup(struct net_device * netdev)135 static 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
internal_dev_create(const struct vport_parms * parms)155 static 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
190 error_free_netdev:
191 free_netdev(netdev_vport->dev);
192 error_free_vport:
193 ovs_vport_free(vport);
194 error:
195 return ERR_PTR(err);
196 }
197
internal_dev_destroy(struct vport * vport)198 static 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
internal_dev_recv(struct vport * vport,struct sk_buff * skb)209 static 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
229 const 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
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