blob: f52dfb9cb5a750d8e98ad5df5f76c6818b884676 [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
42#ifdef CONFIG_NET_IPGRE_DEMUX
43 &ovs_gre_vport_ops,
44#endif
Jesse Grossccb13522011-10-25 19:26:31 -070045};
46
Pravin B Shelar8e4e1712013-04-15 13:23:03 -070047/* Protected by RCU read lock for reading, ovs_mutex for writing. */
Jesse Grossccb13522011-10-25 19:26:31 -070048static struct hlist_head *dev_table;
49#define VPORT_HASH_BUCKETS 1024
50
51/**
52 * ovs_vport_init - initialize vport subsystem
53 *
54 * Called at module load time to initialize the vport subsystem.
55 */
56int ovs_vport_init(void)
57{
58 dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
59 GFP_KERNEL);
60 if (!dev_table)
61 return -ENOMEM;
62
63 return 0;
64}
65
66/**
67 * ovs_vport_exit - shutdown vport subsystem
68 *
69 * Called at module exit time to shutdown the vport subsystem.
70 */
71void ovs_vport_exit(void)
72{
73 kfree(dev_table);
74}
75
Pravin B Shelar46df7b82012-02-22 19:58:59 -080076static struct hlist_head *hash_bucket(struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -070077{
Pravin B Shelar46df7b82012-02-22 19:58:59 -080078 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
Jesse Grossccb13522011-10-25 19:26:31 -070079 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
80}
81
82/**
83 * ovs_vport_locate - find a port that has already been created
84 *
85 * @name: name of port to find
86 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -070087 * Must be called with ovs or RCU read lock.
Jesse Grossccb13522011-10-25 19:26:31 -070088 */
Pravin B Shelar46df7b82012-02-22 19:58:59 -080089struct vport *ovs_vport_locate(struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -070090{
Pravin B Shelar46df7b82012-02-22 19:58:59 -080091 struct hlist_head *bucket = hash_bucket(net, name);
Jesse Grossccb13522011-10-25 19:26:31 -070092 struct vport *vport;
Jesse Grossccb13522011-10-25 19:26:31 -070093
Sasha Levinb67bfe02013-02-27 17:06:00 -080094 hlist_for_each_entry_rcu(vport, bucket, hash_node)
Pravin B Shelar46df7b82012-02-22 19:58:59 -080095 if (!strcmp(name, vport->ops->get_name(vport)) &&
96 net_eq(ovs_dp_get_net(vport->dp), net))
Jesse Grossccb13522011-10-25 19:26:31 -070097 return vport;
98
99 return NULL;
100}
101
102/**
103 * ovs_vport_alloc - allocate and initialize new vport
104 *
105 * @priv_size: Size of private data area to allocate.
106 * @ops: vport device ops
107 *
108 * Allocate and initialize a new vport defined by @ops. The vport will contain
109 * a private data area of size @priv_size that can be accessed using
110 * vport_priv(). vports that are no longer needed should be released with
111 * vport_free().
112 */
113struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
114 const struct vport_parms *parms)
115{
116 struct vport *vport;
117 size_t alloc_size;
118
119 alloc_size = sizeof(struct vport);
120 if (priv_size) {
121 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
122 alloc_size += priv_size;
123 }
124
125 vport = kzalloc(alloc_size, GFP_KERNEL);
126 if (!vport)
127 return ERR_PTR(-ENOMEM);
128
129 vport->dp = parms->dp;
130 vport->port_no = parms->port_no;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000131 vport->upcall_portid = parms->upcall_portid;
Jesse Grossccb13522011-10-25 19:26:31 -0700132 vport->ops = ops;
Pravin B Shelar15eac2a2012-08-23 12:40:54 -0700133 INIT_HLIST_NODE(&vport->dp_hash_node);
Jesse Grossccb13522011-10-25 19:26:31 -0700134
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700135 vport->percpu_stats = alloc_percpu(struct pcpu_tstats);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000136 if (!vport->percpu_stats) {
137 kfree(vport);
Jesse Grossccb13522011-10-25 19:26:31 -0700138 return ERR_PTR(-ENOMEM);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000139 }
Jesse Grossccb13522011-10-25 19:26:31 -0700140
141 spin_lock_init(&vport->stats_lock);
142
143 return vport;
144}
145
146/**
147 * ovs_vport_free - uninitialize and free vport
148 *
149 * @vport: vport to free
150 *
151 * Frees a vport allocated with vport_alloc() when it is no longer needed.
152 *
153 * The caller must ensure that an RCU grace period has passed since the last
154 * time @vport was in a datapath.
155 */
156void ovs_vport_free(struct vport *vport)
157{
158 free_percpu(vport->percpu_stats);
159 kfree(vport);
160}
161
162/**
163 * ovs_vport_add - add vport device (for kernel callers)
164 *
165 * @parms: Information about new vport.
166 *
167 * Creates a new vport with the specified configuration (which is dependent on
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700168 * device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700169 */
170struct vport *ovs_vport_add(const struct vport_parms *parms)
171{
172 struct vport *vport;
173 int err = 0;
174 int i;
175
Jesse Grossccb13522011-10-25 19:26:31 -0700176 for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
177 if (vport_ops_list[i]->type == parms->type) {
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800178 struct hlist_head *bucket;
179
Jesse Grossccb13522011-10-25 19:26:31 -0700180 vport = vport_ops_list[i]->create(parms);
181 if (IS_ERR(vport)) {
182 err = PTR_ERR(vport);
183 goto out;
184 }
185
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800186 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
187 vport->ops->get_name(vport));
188 hlist_add_head_rcu(&vport->hash_node, bucket);
Jesse Grossccb13522011-10-25 19:26:31 -0700189 return vport;
190 }
191 }
192
193 err = -EAFNOSUPPORT;
194
195out:
196 return ERR_PTR(err);
197}
198
199/**
200 * ovs_vport_set_options - modify existing vport device (for kernel callers)
201 *
202 * @vport: vport to modify.
203 * @port: New configuration.
204 *
205 * Modifies an existing device with the specified configuration (which is
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700206 * dependent on device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700207 */
208int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
209{
Jesse Grossccb13522011-10-25 19:26:31 -0700210 if (!vport->ops->set_options)
211 return -EOPNOTSUPP;
212 return vport->ops->set_options(vport, options);
213}
214
215/**
216 * ovs_vport_del - delete existing vport device
217 *
218 * @vport: vport to delete.
219 *
220 * Detaches @vport from its datapath and destroys it. It is possible to fail
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700221 * for reasons such as lack of memory. ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700222 */
223void ovs_vport_del(struct vport *vport)
224{
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700225 ASSERT_OVSL();
Jesse Grossccb13522011-10-25 19:26:31 -0700226
227 hlist_del_rcu(&vport->hash_node);
228
229 vport->ops->destroy(vport);
230}
231
232/**
233 * ovs_vport_get_stats - retrieve device stats
234 *
235 * @vport: vport from which to retrieve the stats
236 * @stats: location to store stats
237 *
238 * Retrieves transmit, receive, and error stats for the given device.
239 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700240 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700241 */
242void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
243{
244 int i;
245
246 memset(stats, 0, sizeof(*stats));
247
248 /* We potentially have 2 sources of stats that need to be combined:
249 * those we have collected (split into err_stats and percpu_stats) from
250 * set_stats() and device error stats from netdev->get_stats() (for
251 * errors that happen downstream and therefore aren't reported through
252 * our vport_record_error() function).
253 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
254 * netdev-stats can be directly read over netlink-ioctl.
255 */
256
257 spin_lock_bh(&vport->stats_lock);
258
259 stats->rx_errors = vport->err_stats.rx_errors;
260 stats->tx_errors = vport->err_stats.tx_errors;
261 stats->tx_dropped = vport->err_stats.tx_dropped;
262 stats->rx_dropped = vport->err_stats.rx_dropped;
263
264 spin_unlock_bh(&vport->stats_lock);
265
266 for_each_possible_cpu(i) {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700267 const struct pcpu_tstats *percpu_stats;
268 struct pcpu_tstats local_stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700269 unsigned int start;
270
271 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
272
273 do {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700274 start = u64_stats_fetch_begin_bh(&percpu_stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700275 local_stats = *percpu_stats;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700276 } while (u64_stats_fetch_retry_bh(&percpu_stats->syncp, start));
Jesse Grossccb13522011-10-25 19:26:31 -0700277
278 stats->rx_bytes += local_stats.rx_bytes;
279 stats->rx_packets += local_stats.rx_packets;
280 stats->tx_bytes += local_stats.tx_bytes;
281 stats->tx_packets += local_stats.tx_packets;
282 }
283}
284
285/**
286 * ovs_vport_get_options - retrieve device options
287 *
288 * @vport: vport from which to retrieve the options.
289 * @skb: sk_buff where options should be appended.
290 *
291 * Retrieves the configuration of the given device, appending an
292 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
293 * vport-specific attributes to @skb.
294 *
295 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
296 * negative error code if a real error occurred. If an error occurs, @skb is
297 * left unmodified.
298 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700299 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700300 */
301int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
302{
303 struct nlattr *nla;
Thomas Graf5d963352013-04-03 00:30:43 +0200304 int err;
305
306 if (!vport->ops->get_options)
307 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700308
309 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
310 if (!nla)
311 return -EMSGSIZE;
312
Thomas Graf5d963352013-04-03 00:30:43 +0200313 err = vport->ops->get_options(vport, skb);
314 if (err) {
315 nla_nest_cancel(skb, nla);
316 return err;
Jesse Grossccb13522011-10-25 19:26:31 -0700317 }
318
319 nla_nest_end(skb, nla);
320 return 0;
321}
322
323/**
324 * ovs_vport_receive - pass up received packet to the datapath for processing
325 *
326 * @vport: vport that received the packet
327 * @skb: skb that was received
328 *
329 * Must be called with rcu_read_lock. The packet cannot be shared and
Cong Wangd176ca22013-02-22 19:41:26 +0800330 * skb->data should point to the Ethernet header.
Jesse Grossccb13522011-10-25 19:26:31 -0700331 */
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700332void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
333 struct ovs_key_ipv4_tunnel *tun_key)
Jesse Grossccb13522011-10-25 19:26:31 -0700334{
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700335 struct pcpu_tstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700336
Shan Wei404f2f12012-11-13 09:52:25 +0800337 stats = this_cpu_ptr(vport->percpu_stats);
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700338 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700339 stats->rx_packets++;
340 stats->rx_bytes += skb->len;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700341 u64_stats_update_end(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700342
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700343 OVS_CB(skb)->tun_key = tun_key;
Jesse Grossccb13522011-10-25 19:26:31 -0700344 ovs_dp_process_received_packet(vport, skb);
345}
346
347/**
348 * ovs_vport_send - send a packet on a device
349 *
350 * @vport: vport on which to send the packet
351 * @skb: skb to send
352 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700353 * Sends the given packet and returns the length of data sent. Either ovs
Jesse Grossccb13522011-10-25 19:26:31 -0700354 * lock or rcu_read_lock must be held.
355 */
356int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
357{
358 int sent = vport->ops->send(vport, skb);
359
Pravin B Shelar91b75142013-05-13 08:22:34 -0700360 if (likely(sent > 0)) {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700361 struct pcpu_tstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700362
Shan Wei404f2f12012-11-13 09:52:25 +0800363 stats = this_cpu_ptr(vport->percpu_stats);
Jesse Grossccb13522011-10-25 19:26:31 -0700364
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700365 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700366 stats->tx_packets++;
367 stats->tx_bytes += sent;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700368 u64_stats_update_end(&stats->syncp);
Pravin B Shelar91b75142013-05-13 08:22:34 -0700369 } else if (sent < 0) {
370 ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
371 kfree_skb(skb);
372 } else
373 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
374
Jesse Grossccb13522011-10-25 19:26:31 -0700375 return sent;
376}
377
378/**
379 * ovs_vport_record_error - indicate device error to generic stats layer
380 *
381 * @vport: vport that encountered the error
382 * @err_type: one of enum vport_err_type types to indicate the error type
383 *
384 * If using the vport generic stats layer indicate that an error of the given
Andy Hillaf784162013-06-07 16:53:50 -0700385 * type has occurred.
Jesse Grossccb13522011-10-25 19:26:31 -0700386 */
387void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type)
388{
389 spin_lock(&vport->stats_lock);
390
391 switch (err_type) {
392 case VPORT_E_RX_DROPPED:
393 vport->err_stats.rx_dropped++;
394 break;
395
396 case VPORT_E_RX_ERROR:
397 vport->err_stats.rx_errors++;
398 break;
399
400 case VPORT_E_TX_DROPPED:
401 vport->err_stats.tx_dropped++;
402 break;
403
404 case VPORT_E_TX_ERROR:
405 vport->err_stats.tx_errors++;
406 break;
Peter Senna Tschudina2bf91b2012-09-18 07:10:44 +0000407 }
Jesse Grossccb13522011-10-25 19:26:31 -0700408
409 spin_unlock(&vport->stats_lock);
410}
Pravin B Shelaraa310702013-06-17 17:50:33 -0700411
412static void free_vport_rcu(struct rcu_head *rcu)
413{
414 struct vport *vport = container_of(rcu, struct vport, rcu);
415
416 ovs_vport_free(vport);
417}
418
419void ovs_vport_deferred_free(struct vport *vport)
420{
421 if (!vport)
422 return;
423
424 call_rcu(&vport->rcu, free_vport_rcu);
425}