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ccb1352e JG |
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> | |
ccb1352e JG |
26 | |
27 | #include "datapath.h" | |
28 | #include "vport-internal_dev.h" | |
29 | #include "vport-netdev.h" | |
30 | ||
31 | struct internal_dev { | |
32 | struct vport *vport; | |
33 | }; | |
34 | ||
35 | static struct internal_dev *internal_dev_priv(struct net_device *netdev) | |
36 | { | |
37 | return netdev_priv(netdev); | |
38 | } | |
39 | ||
40 | /* This function is only called by the kernel network layer.*/ | |
41 | static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev, | |
42 | struct rtnl_link_stats64 *stats) | |
43 | { | |
44 | struct vport *vport = ovs_internal_dev_get_vport(netdev); | |
45 | struct ovs_vport_stats vport_stats; | |
46 | ||
47 | ovs_vport_get_stats(vport, &vport_stats); | |
48 | ||
49 | /* The tx and rx stats need to be swapped because the | |
50 | * switch and host OS have opposite perspectives. */ | |
51 | stats->rx_packets = vport_stats.tx_packets; | |
52 | stats->tx_packets = vport_stats.rx_packets; | |
53 | stats->rx_bytes = vport_stats.tx_bytes; | |
54 | stats->tx_bytes = vport_stats.rx_bytes; | |
55 | stats->rx_errors = vport_stats.tx_errors; | |
56 | stats->tx_errors = vport_stats.rx_errors; | |
57 | stats->rx_dropped = vport_stats.tx_dropped; | |
58 | stats->tx_dropped = vport_stats.rx_dropped; | |
59 | ||
60 | return stats; | |
61 | } | |
62 | ||
63 | static int internal_dev_mac_addr(struct net_device *dev, void *p) | |
64 | { | |
65 | struct sockaddr *addr = p; | |
66 | ||
67 | if (!is_valid_ether_addr(addr->sa_data)) | |
68 | return -EADDRNOTAVAIL; | |
69 | memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); | |
70 | return 0; | |
71 | } | |
72 | ||
73 | /* Called with rcu_read_lock_bh. */ | |
74 | static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) | |
75 | { | |
76 | rcu_read_lock(); | |
77 | ovs_vport_receive(internal_dev_priv(netdev)->vport, skb); | |
78 | rcu_read_unlock(); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static int internal_dev_open(struct net_device *netdev) | |
83 | { | |
84 | netif_start_queue(netdev); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | static int internal_dev_stop(struct net_device *netdev) | |
89 | { | |
90 | netif_stop_queue(netdev); | |
91 | return 0; | |
92 | } | |
93 | ||
94 | static void internal_dev_getinfo(struct net_device *netdev, | |
95 | struct ethtool_drvinfo *info) | |
96 | { | |
97 | strcpy(info->driver, "openvswitch"); | |
98 | } | |
99 | ||
100 | static const struct ethtool_ops internal_dev_ethtool_ops = { | |
101 | .get_drvinfo = internal_dev_getinfo, | |
102 | .get_link = ethtool_op_get_link, | |
103 | }; | |
104 | ||
105 | static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu) | |
106 | { | |
107 | if (new_mtu < 68) | |
108 | return -EINVAL; | |
109 | ||
110 | netdev->mtu = new_mtu; | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static void internal_dev_destructor(struct net_device *dev) | |
115 | { | |
116 | struct vport *vport = ovs_internal_dev_get_vport(dev); | |
117 | ||
118 | ovs_vport_free(vport); | |
119 | free_netdev(dev); | |
120 | } | |
121 | ||
122 | static const struct net_device_ops internal_dev_netdev_ops = { | |
123 | .ndo_open = internal_dev_open, | |
124 | .ndo_stop = internal_dev_stop, | |
125 | .ndo_start_xmit = internal_dev_xmit, | |
126 | .ndo_set_mac_address = internal_dev_mac_addr, | |
127 | .ndo_change_mtu = internal_dev_change_mtu, | |
128 | .ndo_get_stats64 = internal_dev_get_stats, | |
129 | }; | |
130 | ||
131 | static void do_setup(struct net_device *netdev) | |
132 | { | |
133 | ether_setup(netdev); | |
134 | ||
135 | netdev->netdev_ops = &internal_dev_netdev_ops; | |
136 | ||
137 | netdev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
138 | netdev->destructor = internal_dev_destructor; | |
139 | SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops); | |
140 | netdev->tx_queue_len = 0; | |
141 | ||
142 | netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | | |
143 | NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO; | |
144 | ||
145 | netdev->vlan_features = netdev->features; | |
146 | netdev->features |= NETIF_F_HW_VLAN_TX; | |
147 | netdev->hw_features = netdev->features & ~NETIF_F_LLTX; | |
148 | random_ether_addr(netdev->dev_addr); | |
149 | } | |
150 | ||
151 | static struct vport *internal_dev_create(const struct vport_parms *parms) | |
152 | { | |
153 | struct vport *vport; | |
154 | struct netdev_vport *netdev_vport; | |
155 | struct internal_dev *internal_dev; | |
156 | int err; | |
157 | ||
158 | vport = ovs_vport_alloc(sizeof(struct netdev_vport), | |
159 | &ovs_internal_vport_ops, parms); | |
160 | if (IS_ERR(vport)) { | |
161 | err = PTR_ERR(vport); | |
162 | goto error; | |
163 | } | |
164 | ||
165 | netdev_vport = netdev_vport_priv(vport); | |
166 | ||
167 | netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev), | |
168 | parms->name, do_setup); | |
169 | if (!netdev_vport->dev) { | |
170 | err = -ENOMEM; | |
171 | goto error_free_vport; | |
172 | } | |
173 | ||
174 | internal_dev = internal_dev_priv(netdev_vport->dev); | |
175 | internal_dev->vport = vport; | |
176 | ||
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 | netif_start_queue(netdev_vport->dev); | |
183 | ||
184 | return vport; | |
185 | ||
186 | error_free_netdev: | |
187 | free_netdev(netdev_vport->dev); | |
188 | error_free_vport: | |
189 | ovs_vport_free(vport); | |
190 | error: | |
191 | return ERR_PTR(err); | |
192 | } | |
193 | ||
194 | static void internal_dev_destroy(struct vport *vport) | |
195 | { | |
196 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
197 | ||
198 | netif_stop_queue(netdev_vport->dev); | |
199 | dev_set_promiscuity(netdev_vport->dev, -1); | |
200 | ||
201 | /* unregister_netdevice() waits for an RCU grace period. */ | |
202 | unregister_netdevice(netdev_vport->dev); | |
203 | } | |
204 | ||
205 | static int internal_dev_recv(struct vport *vport, struct sk_buff *skb) | |
206 | { | |
207 | struct net_device *netdev = netdev_vport_priv(vport)->dev; | |
208 | int len; | |
209 | ||
210 | len = skb->len; | |
211 | skb->dev = netdev; | |
212 | skb->pkt_type = PACKET_HOST; | |
213 | skb->protocol = eth_type_trans(skb, netdev); | |
214 | ||
215 | netif_rx(skb); | |
216 | ||
217 | return len; | |
218 | } | |
219 | ||
220 | const struct vport_ops ovs_internal_vport_ops = { | |
221 | .type = OVS_VPORT_TYPE_INTERNAL, | |
222 | .create = internal_dev_create, | |
223 | .destroy = internal_dev_destroy, | |
224 | .get_name = ovs_netdev_get_name, | |
225 | .get_ifindex = ovs_netdev_get_ifindex, | |
226 | .send = internal_dev_recv, | |
227 | }; | |
228 | ||
229 | int ovs_is_internal_dev(const struct net_device *netdev) | |
230 | { | |
231 | return netdev->netdev_ops == &internal_dev_netdev_ops; | |
232 | } | |
233 | ||
234 | struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) | |
235 | { | |
236 | if (!ovs_is_internal_dev(netdev)) | |
237 | return NULL; | |
238 | ||
239 | return internal_dev_priv(netdev)->vport; | |
240 | } |