xref: /openbmc/linux/net/openvswitch/vport-internal_dev.c (revision 840ef8b7cc584a23c4f9d05352f4dbaf8e56e5ab)
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 
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.*/
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 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 	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
73 	return 0;
74 }
75 
76 /* Called with rcu_read_lock_bh. */
77 static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
78 {
79 	rcu_read_lock();
80 	ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
81 	rcu_read_unlock();
82 	return 0;
83 }
84 
85 static int internal_dev_open(struct net_device *netdev)
86 {
87 	netif_start_queue(netdev);
88 	return 0;
89 }
90 
91 static int internal_dev_stop(struct net_device *netdev)
92 {
93 	netif_stop_queue(netdev);
94 	return 0;
95 }
96 
97 static void internal_dev_getinfo(struct net_device *netdev,
98 				 struct ethtool_drvinfo *info)
99 {
100 	strlcpy(info->driver, "openvswitch", sizeof(info->driver));
101 }
102 
103 static const struct ethtool_ops internal_dev_ethtool_ops = {
104 	.get_drvinfo	= internal_dev_getinfo,
105 	.get_link	= ethtool_op_get_link,
106 };
107 
108 static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
109 {
110 	if (new_mtu < 68)
111 		return -EINVAL;
112 
113 	netdev->mtu = new_mtu;
114 	return 0;
115 }
116 
117 static void internal_dev_destructor(struct net_device *dev)
118 {
119 	struct vport *vport = ovs_internal_dev_get_vport(dev);
120 
121 	ovs_vport_free(vport);
122 	free_netdev(dev);
123 }
124 
125 static const struct net_device_ops internal_dev_netdev_ops = {
126 	.ndo_open = internal_dev_open,
127 	.ndo_stop = internal_dev_stop,
128 	.ndo_start_xmit = internal_dev_xmit,
129 	.ndo_set_mac_address = internal_dev_mac_addr,
130 	.ndo_change_mtu = internal_dev_change_mtu,
131 	.ndo_get_stats64 = internal_dev_get_stats,
132 };
133 
134 static void do_setup(struct net_device *netdev)
135 {
136 	ether_setup(netdev);
137 
138 	netdev->netdev_ops = &internal_dev_netdev_ops;
139 
140 	netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
141 	netdev->destructor = internal_dev_destructor;
142 	SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
143 	netdev->tx_queue_len = 0;
144 
145 	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
146 			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
147 
148 	netdev->vlan_features = netdev->features;
149 	netdev->features |= NETIF_F_HW_VLAN_TX;
150 	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
151 	eth_hw_addr_random(netdev);
152 }
153 
154 static struct vport *internal_dev_create(const struct vport_parms *parms)
155 {
156 	struct vport *vport;
157 	struct netdev_vport *netdev_vport;
158 	struct internal_dev *internal_dev;
159 	int err;
160 
161 	vport = ovs_vport_alloc(sizeof(struct netdev_vport),
162 				&ovs_internal_vport_ops, parms);
163 	if (IS_ERR(vport)) {
164 		err = PTR_ERR(vport);
165 		goto error;
166 	}
167 
168 	netdev_vport = netdev_vport_priv(vport);
169 
170 	netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
171 					 parms->name, do_setup);
172 	if (!netdev_vport->dev) {
173 		err = -ENOMEM;
174 		goto error_free_vport;
175 	}
176 
177 	dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));
178 	internal_dev = internal_dev_priv(netdev_vport->dev);
179 	internal_dev->vport = vport;
180 
181 	/* Restrict bridge port to current netns. */
182 	if (vport->port_no == OVSP_LOCAL)
183 		netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL;
184 
185 	err = register_netdevice(netdev_vport->dev);
186 	if (err)
187 		goto error_free_netdev;
188 
189 	dev_set_promiscuity(netdev_vport->dev, 1);
190 	netif_start_queue(netdev_vport->dev);
191 
192 	return vport;
193 
194 error_free_netdev:
195 	free_netdev(netdev_vport->dev);
196 error_free_vport:
197 	ovs_vport_free(vport);
198 error:
199 	return ERR_PTR(err);
200 }
201 
202 static void internal_dev_destroy(struct vport *vport)
203 {
204 	struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
205 
206 	netif_stop_queue(netdev_vport->dev);
207 	dev_set_promiscuity(netdev_vport->dev, -1);
208 
209 	/* unregister_netdevice() waits for an RCU grace period. */
210 	unregister_netdevice(netdev_vport->dev);
211 }
212 
213 static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
214 {
215 	struct net_device *netdev = netdev_vport_priv(vport)->dev;
216 	int len;
217 
218 	len = skb->len;
219 
220 	skb_dst_drop(skb);
221 	nf_reset(skb);
222 	secpath_reset(skb);
223 
224 	skb->dev = netdev;
225 	skb->pkt_type = PACKET_HOST;
226 	skb->protocol = eth_type_trans(skb, netdev);
227 
228 	netif_rx(skb);
229 
230 	return len;
231 }
232 
233 const struct vport_ops ovs_internal_vport_ops = {
234 	.type		= OVS_VPORT_TYPE_INTERNAL,
235 	.create		= internal_dev_create,
236 	.destroy	= internal_dev_destroy,
237 	.get_name	= ovs_netdev_get_name,
238 	.get_ifindex	= ovs_netdev_get_ifindex,
239 	.send		= internal_dev_recv,
240 };
241 
242 int ovs_is_internal_dev(const struct net_device *netdev)
243 {
244 	return netdev->netdev_ops == &internal_dev_netdev_ops;
245 }
246 
247 struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
248 {
249 	if (!ovs_is_internal_dev(netdev))
250 		return NULL;
251 
252 	return internal_dev_priv(netdev)->vport;
253 }
254