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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 | #include <net/rtnetlink.h> | |
30 | ||
31 | #include "datapath.h" | |
32 | #include "vport-internal_dev.h" | |
33 | #include "vport-netdev.h" | |
34 | ||
35 | struct internal_dev { | |
36 | struct vport *vport; | |
37 | }; | |
38 | ||
39 | static struct vport_ops ovs_internal_vport_ops; | |
40 | ||
41 | static struct internal_dev *internal_dev_priv(struct net_device *netdev) | |
42 | { | |
43 | return netdev_priv(netdev); | |
44 | } | |
45 | ||
46 | /* Called with rcu_read_lock_bh. */ | |
47 | static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) | |
48 | { | |
49 | int len, err; | |
50 | ||
51 | len = skb->len; | |
52 | rcu_read_lock(); | |
53 | err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL); | |
54 | rcu_read_unlock(); | |
55 | ||
56 | if (likely(!err)) { | |
57 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats); | |
58 | ||
59 | u64_stats_update_begin(&tstats->syncp); | |
60 | tstats->tx_bytes += len; | |
61 | tstats->tx_packets++; | |
62 | u64_stats_update_end(&tstats->syncp); | |
63 | } else { | |
64 | netdev->stats.tx_errors++; | |
65 | } | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static int internal_dev_open(struct net_device *netdev) | |
70 | { | |
71 | netif_start_queue(netdev); | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static int internal_dev_stop(struct net_device *netdev) | |
76 | { | |
77 | netif_stop_queue(netdev); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static void internal_dev_getinfo(struct net_device *netdev, | |
82 | struct ethtool_drvinfo *info) | |
83 | { | |
84 | strlcpy(info->driver, "openvswitch", sizeof(info->driver)); | |
85 | } | |
86 | ||
87 | static const struct ethtool_ops internal_dev_ethtool_ops = { | |
88 | .get_drvinfo = internal_dev_getinfo, | |
89 | .get_link = ethtool_op_get_link, | |
90 | }; | |
91 | ||
92 | static void internal_dev_destructor(struct net_device *dev) | |
93 | { | |
94 | struct vport *vport = ovs_internal_dev_get_vport(dev); | |
95 | ||
96 | ovs_vport_free(vport); | |
97 | } | |
98 | ||
99 | static void | |
100 | internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats) | |
101 | { | |
102 | int i; | |
103 | ||
104 | memset(stats, 0, sizeof(*stats)); | |
105 | stats->rx_errors = dev->stats.rx_errors; | |
106 | stats->tx_errors = dev->stats.tx_errors; | |
107 | stats->tx_dropped = dev->stats.tx_dropped; | |
108 | stats->rx_dropped = dev->stats.rx_dropped; | |
109 | ||
110 | for_each_possible_cpu(i) { | |
111 | const struct pcpu_sw_netstats *percpu_stats; | |
112 | struct pcpu_sw_netstats local_stats; | |
113 | unsigned int start; | |
114 | ||
115 | percpu_stats = per_cpu_ptr(dev->tstats, i); | |
116 | ||
117 | do { | |
118 | start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); | |
119 | local_stats = *percpu_stats; | |
120 | } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); | |
121 | ||
122 | stats->rx_bytes += local_stats.rx_bytes; | |
123 | stats->rx_packets += local_stats.rx_packets; | |
124 | stats->tx_bytes += local_stats.tx_bytes; | |
125 | stats->tx_packets += local_stats.tx_packets; | |
126 | } | |
127 | } | |
128 | ||
129 | static void internal_set_rx_headroom(struct net_device *dev, int new_hr) | |
130 | { | |
131 | dev->needed_headroom = new_hr < 0 ? 0 : new_hr; | |
132 | } | |
133 | ||
134 | static const struct net_device_ops internal_dev_netdev_ops = { | |
135 | .ndo_open = internal_dev_open, | |
136 | .ndo_stop = internal_dev_stop, | |
137 | .ndo_start_xmit = internal_dev_xmit, | |
138 | .ndo_set_mac_address = eth_mac_addr, | |
139 | .ndo_get_stats64 = internal_get_stats, | |
140 | .ndo_set_rx_headroom = internal_set_rx_headroom, | |
141 | }; | |
142 | ||
143 | static struct rtnl_link_ops internal_dev_link_ops __read_mostly = { | |
144 | .kind = "openvswitch", | |
145 | }; | |
146 | ||
147 | static void do_setup(struct net_device *netdev) | |
148 | { | |
149 | ether_setup(netdev); | |
150 | ||
151 | netdev->max_mtu = ETH_MAX_MTU; | |
152 | ||
153 | netdev->netdev_ops = &internal_dev_netdev_ops; | |
154 | ||
155 | netdev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
156 | netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH | | |
157 | IFF_PHONY_HEADROOM | IFF_NO_QUEUE; | |
158 | netdev->needs_free_netdev = true; | |
159 | netdev->priv_destructor = internal_dev_destructor; | |
160 | netdev->ethtool_ops = &internal_dev_ethtool_ops; | |
161 | netdev->rtnl_link_ops = &internal_dev_link_ops; | |
162 | ||
163 | netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST | | |
164 | NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | | |
165 | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL; | |
166 | ||
167 | netdev->vlan_features = netdev->features; | |
168 | netdev->hw_enc_features = netdev->features; | |
169 | netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; | |
170 | netdev->hw_features = netdev->features & ~NETIF_F_LLTX; | |
171 | ||
172 | eth_hw_addr_random(netdev); | |
173 | } | |
174 | ||
175 | static struct vport *internal_dev_create(const struct vport_parms *parms) | |
176 | { | |
177 | struct vport *vport; | |
178 | struct internal_dev *internal_dev; | |
179 | int err; | |
180 | ||
181 | vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); | |
182 | if (IS_ERR(vport)) { | |
183 | err = PTR_ERR(vport); | |
184 | goto error; | |
185 | } | |
186 | ||
187 | vport->dev = alloc_netdev(sizeof(struct internal_dev), | |
188 | parms->name, NET_NAME_USER, do_setup); | |
189 | if (!vport->dev) { | |
190 | err = -ENOMEM; | |
191 | goto error_free_vport; | |
192 | } | |
193 | vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
194 | if (!vport->dev->tstats) { | |
195 | err = -ENOMEM; | |
196 | goto error_free_netdev; | |
197 | } | |
198 | vport->dev->needed_headroom = vport->dp->max_headroom; | |
199 | ||
200 | dev_net_set(vport->dev, ovs_dp_get_net(vport->dp)); | |
201 | internal_dev = internal_dev_priv(vport->dev); | |
202 | internal_dev->vport = vport; | |
203 | ||
204 | /* Restrict bridge port to current netns. */ | |
205 | if (vport->port_no == OVSP_LOCAL) | |
206 | vport->dev->features |= NETIF_F_NETNS_LOCAL; | |
207 | ||
208 | rtnl_lock(); | |
209 | err = register_netdevice(vport->dev); | |
210 | if (err) | |
211 | goto error_unlock; | |
212 | ||
213 | dev_set_promiscuity(vport->dev, 1); | |
214 | rtnl_unlock(); | |
215 | netif_start_queue(vport->dev); | |
216 | ||
217 | return vport; | |
218 | ||
219 | error_unlock: | |
220 | rtnl_unlock(); | |
221 | free_percpu(vport->dev->tstats); | |
222 | error_free_netdev: | |
223 | free_netdev(vport->dev); | |
224 | error_free_vport: | |
225 | ovs_vport_free(vport); | |
226 | error: | |
227 | return ERR_PTR(err); | |
228 | } | |
229 | ||
230 | static void internal_dev_destroy(struct vport *vport) | |
231 | { | |
232 | netif_stop_queue(vport->dev); | |
233 | rtnl_lock(); | |
234 | dev_set_promiscuity(vport->dev, -1); | |
235 | ||
236 | /* unregister_netdevice() waits for an RCU grace period. */ | |
237 | unregister_netdevice(vport->dev); | |
238 | free_percpu(vport->dev->tstats); | |
239 | rtnl_unlock(); | |
240 | } | |
241 | ||
242 | static netdev_tx_t internal_dev_recv(struct sk_buff *skb) | |
243 | { | |
244 | struct net_device *netdev = skb->dev; | |
245 | struct pcpu_sw_netstats *stats; | |
246 | ||
247 | if (unlikely(!(netdev->flags & IFF_UP))) { | |
248 | kfree_skb(skb); | |
249 | netdev->stats.rx_dropped++; | |
250 | return NETDEV_TX_OK; | |
251 | } | |
252 | ||
253 | skb_dst_drop(skb); | |
254 | nf_reset(skb); | |
255 | secpath_reset(skb); | |
256 | ||
257 | skb->pkt_type = PACKET_HOST; | |
258 | skb->protocol = eth_type_trans(skb, netdev); | |
259 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
260 | ||
261 | stats = this_cpu_ptr(netdev->tstats); | |
262 | u64_stats_update_begin(&stats->syncp); | |
263 | stats->rx_packets++; | |
264 | stats->rx_bytes += skb->len; | |
265 | u64_stats_update_end(&stats->syncp); | |
266 | ||
267 | netif_rx(skb); | |
268 | return NETDEV_TX_OK; | |
269 | } | |
270 | ||
271 | static struct vport_ops ovs_internal_vport_ops = { | |
272 | .type = OVS_VPORT_TYPE_INTERNAL, | |
273 | .create = internal_dev_create, | |
274 | .destroy = internal_dev_destroy, | |
275 | .send = internal_dev_recv, | |
276 | }; | |
277 | ||
278 | int ovs_is_internal_dev(const struct net_device *netdev) | |
279 | { | |
280 | return netdev->netdev_ops == &internal_dev_netdev_ops; | |
281 | } | |
282 | ||
283 | struct vport *ovs_internal_dev_get_vport(struct net_device *netdev) | |
284 | { | |
285 | if (!ovs_is_internal_dev(netdev)) | |
286 | return NULL; | |
287 | ||
288 | return internal_dev_priv(netdev)->vport; | |
289 | } | |
290 | ||
291 | int ovs_internal_dev_rtnl_link_register(void) | |
292 | { | |
293 | int err; | |
294 | ||
295 | err = rtnl_link_register(&internal_dev_link_ops); | |
296 | if (err < 0) | |
297 | return err; | |
298 | ||
299 | err = ovs_vport_ops_register(&ovs_internal_vport_ops); | |
300 | if (err < 0) | |
301 | rtnl_link_unregister(&internal_dev_link_ops); | |
302 | ||
303 | return err; | |
304 | } | |
305 | ||
306 | void ovs_internal_dev_rtnl_link_unregister(void) | |
307 | { | |
308 | ovs_vport_ops_unregister(&ovs_internal_vport_ops); | |
309 | rtnl_link_unregister(&internal_dev_link_ops); | |
310 | } |