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ccb1352e | 1 | /* |
caf2ee14 | 2 | * Copyright (c) 2007-2012 Nicira, Inc. |
ccb1352e JG |
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 | 26 | |
7fe99e2d JG |
27 | #include <net/dst.h> |
28 | #include <net/xfrm.h> | |
29 | ||
ccb1352e JG |
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; | |
7ce5d222 | 72 | dev->addr_assign_type &= ~NET_ADDR_RANDOM; |
ccb1352e JG |
73 | memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); |
74 | return 0; | |
75 | } | |
76 | ||
77 | /* Called with rcu_read_lock_bh. */ | |
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 | ||
86 | static int internal_dev_open(struct net_device *netdev) | |
87 | { | |
88 | netif_start_queue(netdev); | |
89 | return 0; | |
90 | } | |
91 | ||
92 | static int internal_dev_stop(struct net_device *netdev) | |
93 | { | |
94 | netif_stop_queue(netdev); | |
95 | return 0; | |
96 | } | |
97 | ||
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 | ||
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 | ||
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 | ||
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 | | |
46df7b81 | 147 | NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO; |
ccb1352e JG |
148 | |
149 | netdev->vlan_features = netdev->features; | |
150 | netdev->features |= NETIF_F_HW_VLAN_TX; | |
151 | netdev->hw_features = netdev->features & ~NETIF_F_LLTX; | |
7ce5d222 | 152 | eth_hw_addr_random(netdev); |
ccb1352e JG |
153 | } |
154 | ||
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 | ||
46df7b81 | 178 | dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp)); |
ccb1352e JG |
179 | internal_dev = internal_dev_priv(netdev_vport->dev); |
180 | internal_dev->vport = vport; | |
181 | ||
46df7b81 PS |
182 | /* Restrict bridge port to current netns. */ |
183 | if (vport->port_no == OVSP_LOCAL) | |
184 | netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL; | |
185 | ||
ccb1352e JG |
186 | err = register_netdevice(netdev_vport->dev); |
187 | if (err) | |
188 | goto error_free_netdev; | |
189 | ||
190 | dev_set_promiscuity(netdev_vport->dev, 1); | |
191 | netif_start_queue(netdev_vport->dev); | |
192 | ||
193 | return vport; | |
194 | ||
195 | error_free_netdev: | |
196 | free_netdev(netdev_vport->dev); | |
197 | error_free_vport: | |
198 | ovs_vport_free(vport); | |
199 | error: | |
200 | return ERR_PTR(err); | |
201 | } | |
202 | ||
203 | static void internal_dev_destroy(struct vport *vport) | |
204 | { | |
205 | struct netdev_vport *netdev_vport = netdev_vport_priv(vport); | |
206 | ||
207 | netif_stop_queue(netdev_vport->dev); | |
208 | dev_set_promiscuity(netdev_vport->dev, -1); | |
209 | ||
210 | /* unregister_netdevice() waits for an RCU grace period. */ | |
211 | unregister_netdevice(netdev_vport->dev); | |
212 | } | |
213 | ||
214 | static int internal_dev_recv(struct vport *vport, struct sk_buff *skb) | |
215 | { | |
216 | struct net_device *netdev = netdev_vport_priv(vport)->dev; | |
217 | int len; | |
218 | ||
219 | len = skb->len; | |
7fe99e2d JG |
220 | |
221 | skb_dst_drop(skb); | |
222 | nf_reset(skb); | |
223 | secpath_reset(skb); | |
224 | ||
ccb1352e JG |
225 | skb->dev = netdev; |
226 | skb->pkt_type = PACKET_HOST; | |
227 | skb->protocol = eth_type_trans(skb, netdev); | |
228 | ||
229 | netif_rx(skb); | |
230 | ||
231 | return len; | |
232 | } | |
233 | ||
234 | const struct vport_ops ovs_internal_vport_ops = { | |
235 | .type = OVS_VPORT_TYPE_INTERNAL, | |
236 | .create = internal_dev_create, | |
237 | .destroy = internal_dev_destroy, | |
238 | .get_name = ovs_netdev_get_name, | |
239 | .get_ifindex = ovs_netdev_get_ifindex, | |
240 | .send = internal_dev_recv, | |
241 | }; | |
242 | ||
243 | int ovs_is_internal_dev(const struct net_device *netdev) | |
244 | { | |
245 | return netdev->netdev_ops == &internal_dev_netdev_ops; | |
246 | } | |
247 | ||
248 | struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) | |
249 | { | |
250 | if (!ovs_is_internal_dev(netdev)) | |
251 | return NULL; | |
252 | ||
253 | return internal_dev_priv(netdev)->vport; | |
254 | } |