blob: d830a95f03a4ba65ba755a3ff8dbf638700c9c68 [file] [log] [blame]
Jesse Grossccb13522011-10-25 19:26:31 -07001/*
Raju Subramaniancaf2ee12012-05-03 18:55:23 -07002 * Copyright (c) 2007-2012 Nicira, Inc.
Jesse Grossccb13522011-10-25 19:26:31 -07003 *
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
Jesse Grossccb13522011-10-25 19:26:31 -070019#include <linux/etherdevice.h>
20#include <linux/if.h>
21#include <linux/if_vlan.h>
Pravin B Shelar46df7b82012-02-22 19:58:59 -080022#include <linux/jhash.h>
Jesse Grossccb13522011-10-25 19:26:31 -070023#include <linux/kernel.h>
24#include <linux/list.h>
25#include <linux/mutex.h>
26#include <linux/percpu.h>
27#include <linux/rcupdate.h>
28#include <linux/rtnetlink.h>
29#include <linux/compat.h>
Pravin B Shelar46df7b82012-02-22 19:58:59 -080030#include <net/net_namespace.h>
Jesse Grossccb13522011-10-25 19:26:31 -070031
Pravin B Shelar46df7b82012-02-22 19:58:59 -080032#include "datapath.h"
Jesse Grossccb13522011-10-25 19:26:31 -070033#include "vport.h"
34#include "vport-internal_dev.h"
35
36/* List of statically compiled vport implementations. Don't forget to also
37 * add yours to the list at the bottom of vport.h. */
38static const struct vport_ops *vport_ops_list[] = {
39 &ovs_netdev_vport_ops,
40 &ovs_internal_vport_ops,
Pravin B Shelaraa310702013-06-17 17:50:33 -070041
Pravin B Shelarfb825a52013-06-28 16:07:40 -070042#ifdef CONFIG_OPENVSWITCH_GRE
Pravin B Shelaraa310702013-06-17 17:50:33 -070043 &ovs_gre_vport_ops,
44#endif
Pravin B Shelar58264842013-08-19 11:23:34 -070045#ifdef CONFIG_OPENVSWITCH_VXLAN
46 &ovs_vxlan_vport_ops,
47#endif
Jesse Grossccb13522011-10-25 19:26:31 -070048};
49
Pravin B Shelar8e4e1712013-04-15 13:23:03 -070050/* Protected by RCU read lock for reading, ovs_mutex for writing. */
Jesse Grossccb13522011-10-25 19:26:31 -070051static struct hlist_head *dev_table;
52#define VPORT_HASH_BUCKETS 1024
53
54/**
55 * ovs_vport_init - initialize vport subsystem
56 *
57 * Called at module load time to initialize the vport subsystem.
58 */
59int ovs_vport_init(void)
60{
61 dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
62 GFP_KERNEL);
63 if (!dev_table)
64 return -ENOMEM;
65
66 return 0;
67}
68
69/**
70 * ovs_vport_exit - shutdown vport subsystem
71 *
72 * Called at module exit time to shutdown the vport subsystem.
73 */
74void ovs_vport_exit(void)
75{
76 kfree(dev_table);
77}
78
Pravin B Shelar46df7b82012-02-22 19:58:59 -080079static struct hlist_head *hash_bucket(struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -070080{
Pravin B Shelar46df7b82012-02-22 19:58:59 -080081 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
Jesse Grossccb13522011-10-25 19:26:31 -070082 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
83}
84
85/**
86 * ovs_vport_locate - find a port that has already been created
87 *
88 * @name: name of port to find
89 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -070090 * Must be called with ovs or RCU read lock.
Jesse Grossccb13522011-10-25 19:26:31 -070091 */
Pravin B Shelar46df7b82012-02-22 19:58:59 -080092struct vport *ovs_vport_locate(struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -070093{
Pravin B Shelar46df7b82012-02-22 19:58:59 -080094 struct hlist_head *bucket = hash_bucket(net, name);
Jesse Grossccb13522011-10-25 19:26:31 -070095 struct vport *vport;
Jesse Grossccb13522011-10-25 19:26:31 -070096
Sasha Levinb67bfe02013-02-27 17:06:00 -080097 hlist_for_each_entry_rcu(vport, bucket, hash_node)
Pravin B Shelar46df7b82012-02-22 19:58:59 -080098 if (!strcmp(name, vport->ops->get_name(vport)) &&
99 net_eq(ovs_dp_get_net(vport->dp), net))
Jesse Grossccb13522011-10-25 19:26:31 -0700100 return vport;
101
102 return NULL;
103}
104
105/**
106 * ovs_vport_alloc - allocate and initialize new vport
107 *
108 * @priv_size: Size of private data area to allocate.
109 * @ops: vport device ops
110 *
111 * Allocate and initialize a new vport defined by @ops. The vport will contain
112 * a private data area of size @priv_size that can be accessed using
113 * vport_priv(). vports that are no longer needed should be released with
114 * vport_free().
115 */
116struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
117 const struct vport_parms *parms)
118{
119 struct vport *vport;
120 size_t alloc_size;
John Stultz827da442013-10-07 15:51:58 -0700121 int i;
Jesse Grossccb13522011-10-25 19:26:31 -0700122
123 alloc_size = sizeof(struct vport);
124 if (priv_size) {
125 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
126 alloc_size += priv_size;
127 }
128
129 vport = kzalloc(alloc_size, GFP_KERNEL);
130 if (!vport)
131 return ERR_PTR(-ENOMEM);
132
133 vport->dp = parms->dp;
134 vport->port_no = parms->port_no;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000135 vport->upcall_portid = parms->upcall_portid;
Jesse Grossccb13522011-10-25 19:26:31 -0700136 vport->ops = ops;
Pravin B Shelar15eac2a2012-08-23 12:40:54 -0700137 INIT_HLIST_NODE(&vport->dp_hash_node);
Jesse Grossccb13522011-10-25 19:26:31 -0700138
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700139 vport->percpu_stats = alloc_percpu(struct pcpu_tstats);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000140 if (!vport->percpu_stats) {
141 kfree(vport);
Jesse Grossccb13522011-10-25 19:26:31 -0700142 return ERR_PTR(-ENOMEM);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000143 }
Jesse Grossccb13522011-10-25 19:26:31 -0700144
John Stultz827da442013-10-07 15:51:58 -0700145 for_each_possible_cpu(i) {
146 struct pcpu_tstats *vport_stats;
147 vport_stats = per_cpu_ptr(vport->percpu_stats, i);
148 u64_stats_init(&vport_stats->syncp);
149 }
150
151
Jesse Grossccb13522011-10-25 19:26:31 -0700152 spin_lock_init(&vport->stats_lock);
153
154 return vport;
155}
156
157/**
158 * ovs_vport_free - uninitialize and free vport
159 *
160 * @vport: vport to free
161 *
162 * Frees a vport allocated with vport_alloc() when it is no longer needed.
163 *
164 * The caller must ensure that an RCU grace period has passed since the last
165 * time @vport was in a datapath.
166 */
167void ovs_vport_free(struct vport *vport)
168{
169 free_percpu(vport->percpu_stats);
170 kfree(vport);
171}
172
173/**
174 * ovs_vport_add - add vport device (for kernel callers)
175 *
176 * @parms: Information about new vport.
177 *
178 * Creates a new vport with the specified configuration (which is dependent on
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700179 * device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700180 */
181struct vport *ovs_vport_add(const struct vport_parms *parms)
182{
183 struct vport *vport;
184 int err = 0;
185 int i;
186
Jesse Grossccb13522011-10-25 19:26:31 -0700187 for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
188 if (vport_ops_list[i]->type == parms->type) {
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800189 struct hlist_head *bucket;
190
Jesse Grossccb13522011-10-25 19:26:31 -0700191 vport = vport_ops_list[i]->create(parms);
192 if (IS_ERR(vport)) {
193 err = PTR_ERR(vport);
194 goto out;
195 }
196
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800197 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
198 vport->ops->get_name(vport));
199 hlist_add_head_rcu(&vport->hash_node, bucket);
Jesse Grossccb13522011-10-25 19:26:31 -0700200 return vport;
201 }
202 }
203
204 err = -EAFNOSUPPORT;
205
206out:
207 return ERR_PTR(err);
208}
209
210/**
211 * ovs_vport_set_options - modify existing vport device (for kernel callers)
212 *
213 * @vport: vport to modify.
Justin Pettit26948382013-08-19 17:49:29 -0700214 * @options: New configuration.
Jesse Grossccb13522011-10-25 19:26:31 -0700215 *
216 * Modifies an existing device with the specified configuration (which is
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700217 * dependent on device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700218 */
219int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
220{
Jesse Grossccb13522011-10-25 19:26:31 -0700221 if (!vport->ops->set_options)
222 return -EOPNOTSUPP;
223 return vport->ops->set_options(vport, options);
224}
225
226/**
227 * ovs_vport_del - delete existing vport device
228 *
229 * @vport: vport to delete.
230 *
231 * Detaches @vport from its datapath and destroys it. It is possible to fail
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700232 * for reasons such as lack of memory. ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700233 */
234void ovs_vport_del(struct vport *vport)
235{
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700236 ASSERT_OVSL();
Jesse Grossccb13522011-10-25 19:26:31 -0700237
238 hlist_del_rcu(&vport->hash_node);
239
240 vport->ops->destroy(vport);
241}
242
243/**
244 * ovs_vport_get_stats - retrieve device stats
245 *
246 * @vport: vport from which to retrieve the stats
247 * @stats: location to store stats
248 *
249 * Retrieves transmit, receive, and error stats for the given device.
250 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700251 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700252 */
253void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
254{
255 int i;
256
257 memset(stats, 0, sizeof(*stats));
258
259 /* We potentially have 2 sources of stats that need to be combined:
260 * those we have collected (split into err_stats and percpu_stats) from
261 * set_stats() and device error stats from netdev->get_stats() (for
262 * errors that happen downstream and therefore aren't reported through
263 * our vport_record_error() function).
264 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
265 * netdev-stats can be directly read over netlink-ioctl.
266 */
267
268 spin_lock_bh(&vport->stats_lock);
269
270 stats->rx_errors = vport->err_stats.rx_errors;
271 stats->tx_errors = vport->err_stats.tx_errors;
272 stats->tx_dropped = vport->err_stats.tx_dropped;
273 stats->rx_dropped = vport->err_stats.rx_dropped;
274
275 spin_unlock_bh(&vport->stats_lock);
276
277 for_each_possible_cpu(i) {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700278 const struct pcpu_tstats *percpu_stats;
279 struct pcpu_tstats local_stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700280 unsigned int start;
281
282 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
283
284 do {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700285 start = u64_stats_fetch_begin_bh(&percpu_stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700286 local_stats = *percpu_stats;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700287 } while (u64_stats_fetch_retry_bh(&percpu_stats->syncp, start));
Jesse Grossccb13522011-10-25 19:26:31 -0700288
289 stats->rx_bytes += local_stats.rx_bytes;
290 stats->rx_packets += local_stats.rx_packets;
291 stats->tx_bytes += local_stats.tx_bytes;
292 stats->tx_packets += local_stats.tx_packets;
293 }
294}
295
296/**
297 * ovs_vport_get_options - retrieve device options
298 *
299 * @vport: vport from which to retrieve the options.
300 * @skb: sk_buff where options should be appended.
301 *
302 * Retrieves the configuration of the given device, appending an
303 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
304 * vport-specific attributes to @skb.
305 *
306 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
307 * negative error code if a real error occurred. If an error occurs, @skb is
308 * left unmodified.
309 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700310 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700311 */
312int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
313{
314 struct nlattr *nla;
Thomas Graf5d963352013-04-03 00:30:43 +0200315 int err;
316
317 if (!vport->ops->get_options)
318 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700319
320 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
321 if (!nla)
322 return -EMSGSIZE;
323
Thomas Graf5d963352013-04-03 00:30:43 +0200324 err = vport->ops->get_options(vport, skb);
325 if (err) {
326 nla_nest_cancel(skb, nla);
327 return err;
Jesse Grossccb13522011-10-25 19:26:31 -0700328 }
329
330 nla_nest_end(skb, nla);
331 return 0;
332}
333
334/**
335 * ovs_vport_receive - pass up received packet to the datapath for processing
336 *
337 * @vport: vport that received the packet
338 * @skb: skb that was received
Justin Pettit26948382013-08-19 17:49:29 -0700339 * @tun_key: tunnel (if any) that carried packet
Jesse Grossccb13522011-10-25 19:26:31 -0700340 *
341 * Must be called with rcu_read_lock. The packet cannot be shared and
Cong Wangd176ca22013-02-22 19:41:26 +0800342 * skb->data should point to the Ethernet header.
Jesse Grossccb13522011-10-25 19:26:31 -0700343 */
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700344void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
345 struct ovs_key_ipv4_tunnel *tun_key)
Jesse Grossccb13522011-10-25 19:26:31 -0700346{
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700347 struct pcpu_tstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700348
Shan Wei404f2f12012-11-13 09:52:25 +0800349 stats = this_cpu_ptr(vport->percpu_stats);
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700350 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700351 stats->rx_packets++;
352 stats->rx_bytes += skb->len;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700353 u64_stats_update_end(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700354
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700355 OVS_CB(skb)->tun_key = tun_key;
Jesse Grossccb13522011-10-25 19:26:31 -0700356 ovs_dp_process_received_packet(vport, skb);
357}
358
359/**
360 * ovs_vport_send - send a packet on a device
361 *
362 * @vport: vport on which to send the packet
363 * @skb: skb to send
364 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700365 * Sends the given packet and returns the length of data sent. Either ovs
Jesse Grossccb13522011-10-25 19:26:31 -0700366 * lock or rcu_read_lock must be held.
367 */
368int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
369{
370 int sent = vport->ops->send(vport, skb);
371
Pravin B Shelar91b75142013-05-13 08:22:34 -0700372 if (likely(sent > 0)) {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700373 struct pcpu_tstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700374
Shan Wei404f2f12012-11-13 09:52:25 +0800375 stats = this_cpu_ptr(vport->percpu_stats);
Jesse Grossccb13522011-10-25 19:26:31 -0700376
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700377 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700378 stats->tx_packets++;
379 stats->tx_bytes += sent;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700380 u64_stats_update_end(&stats->syncp);
Pravin B Shelar91b75142013-05-13 08:22:34 -0700381 } else if (sent < 0) {
382 ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
383 kfree_skb(skb);
384 } else
385 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
386
Jesse Grossccb13522011-10-25 19:26:31 -0700387 return sent;
388}
389
390/**
391 * ovs_vport_record_error - indicate device error to generic stats layer
392 *
393 * @vport: vport that encountered the error
394 * @err_type: one of enum vport_err_type types to indicate the error type
395 *
396 * If using the vport generic stats layer indicate that an error of the given
Andy Hillaf784162013-06-07 16:53:50 -0700397 * type has occurred.
Jesse Grossccb13522011-10-25 19:26:31 -0700398 */
399void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type)
400{
401 spin_lock(&vport->stats_lock);
402
403 switch (err_type) {
404 case VPORT_E_RX_DROPPED:
405 vport->err_stats.rx_dropped++;
406 break;
407
408 case VPORT_E_RX_ERROR:
409 vport->err_stats.rx_errors++;
410 break;
411
412 case VPORT_E_TX_DROPPED:
413 vport->err_stats.tx_dropped++;
414 break;
415
416 case VPORT_E_TX_ERROR:
417 vport->err_stats.tx_errors++;
418 break;
Peter Senna Tschudina2bf91b2012-09-18 07:10:44 +0000419 }
Jesse Grossccb13522011-10-25 19:26:31 -0700420
421 spin_unlock(&vport->stats_lock);
422}
Pravin B Shelaraa310702013-06-17 17:50:33 -0700423
424static void free_vport_rcu(struct rcu_head *rcu)
425{
426 struct vport *vport = container_of(rcu, struct vport, rcu);
427
428 ovs_vport_free(vport);
429}
430
431void ovs_vport_deferred_free(struct vport *vport)
432{
433 if (!vport)
434 return;
435
436 call_rcu(&vport->rcu, free_vport_rcu);
437}