blob: 720623190eaa82d9ad4a2fcf460a0270cf57a03b [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,
41};
42
Pravin B Shelar8e4e1712013-04-15 13:23:03 -070043/* Protected by RCU read lock for reading, ovs_mutex for writing. */
Jesse Grossccb13522011-10-25 19:26:31 -070044static struct hlist_head *dev_table;
45#define VPORT_HASH_BUCKETS 1024
46
47/**
48 * ovs_vport_init - initialize vport subsystem
49 *
50 * Called at module load time to initialize the vport subsystem.
51 */
52int ovs_vport_init(void)
53{
54 dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
55 GFP_KERNEL);
56 if (!dev_table)
57 return -ENOMEM;
58
59 return 0;
60}
61
62/**
63 * ovs_vport_exit - shutdown vport subsystem
64 *
65 * Called at module exit time to shutdown the vport subsystem.
66 */
67void ovs_vport_exit(void)
68{
69 kfree(dev_table);
70}
71
Pravin B Shelar46df7b82012-02-22 19:58:59 -080072static struct hlist_head *hash_bucket(struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -070073{
Pravin B Shelar46df7b82012-02-22 19:58:59 -080074 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
Jesse Grossccb13522011-10-25 19:26:31 -070075 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
76}
77
78/**
79 * ovs_vport_locate - find a port that has already been created
80 *
81 * @name: name of port to find
82 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -070083 * Must be called with ovs or RCU read lock.
Jesse Grossccb13522011-10-25 19:26:31 -070084 */
Pravin B Shelar46df7b82012-02-22 19:58:59 -080085struct vport *ovs_vport_locate(struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -070086{
Pravin B Shelar46df7b82012-02-22 19:58:59 -080087 struct hlist_head *bucket = hash_bucket(net, name);
Jesse Grossccb13522011-10-25 19:26:31 -070088 struct vport *vport;
Jesse Grossccb13522011-10-25 19:26:31 -070089
Sasha Levinb67bfe02013-02-27 17:06:00 -080090 hlist_for_each_entry_rcu(vport, bucket, hash_node)
Pravin B Shelar46df7b82012-02-22 19:58:59 -080091 if (!strcmp(name, vport->ops->get_name(vport)) &&
92 net_eq(ovs_dp_get_net(vport->dp), net))
Jesse Grossccb13522011-10-25 19:26:31 -070093 return vport;
94
95 return NULL;
96}
97
98/**
99 * ovs_vport_alloc - allocate and initialize new vport
100 *
101 * @priv_size: Size of private data area to allocate.
102 * @ops: vport device ops
103 *
104 * Allocate and initialize a new vport defined by @ops. The vport will contain
105 * a private data area of size @priv_size that can be accessed using
106 * vport_priv(). vports that are no longer needed should be released with
107 * vport_free().
108 */
109struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
110 const struct vport_parms *parms)
111{
112 struct vport *vport;
113 size_t alloc_size;
114
115 alloc_size = sizeof(struct vport);
116 if (priv_size) {
117 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
118 alloc_size += priv_size;
119 }
120
121 vport = kzalloc(alloc_size, GFP_KERNEL);
122 if (!vport)
123 return ERR_PTR(-ENOMEM);
124
125 vport->dp = parms->dp;
126 vport->port_no = parms->port_no;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000127 vport->upcall_portid = parms->upcall_portid;
Jesse Grossccb13522011-10-25 19:26:31 -0700128 vport->ops = ops;
Pravin B Shelar15eac2a2012-08-23 12:40:54 -0700129 INIT_HLIST_NODE(&vport->dp_hash_node);
Jesse Grossccb13522011-10-25 19:26:31 -0700130
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700131 vport->percpu_stats = alloc_percpu(struct pcpu_tstats);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000132 if (!vport->percpu_stats) {
133 kfree(vport);
Jesse Grossccb13522011-10-25 19:26:31 -0700134 return ERR_PTR(-ENOMEM);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000135 }
Jesse Grossccb13522011-10-25 19:26:31 -0700136
137 spin_lock_init(&vport->stats_lock);
138
139 return vport;
140}
141
142/**
143 * ovs_vport_free - uninitialize and free vport
144 *
145 * @vport: vport to free
146 *
147 * Frees a vport allocated with vport_alloc() when it is no longer needed.
148 *
149 * The caller must ensure that an RCU grace period has passed since the last
150 * time @vport was in a datapath.
151 */
152void ovs_vport_free(struct vport *vport)
153{
154 free_percpu(vport->percpu_stats);
155 kfree(vport);
156}
157
158/**
159 * ovs_vport_add - add vport device (for kernel callers)
160 *
161 * @parms: Information about new vport.
162 *
163 * Creates a new vport with the specified configuration (which is dependent on
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700164 * device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700165 */
166struct vport *ovs_vport_add(const struct vport_parms *parms)
167{
168 struct vport *vport;
169 int err = 0;
170 int i;
171
Jesse Grossccb13522011-10-25 19:26:31 -0700172 for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
173 if (vport_ops_list[i]->type == parms->type) {
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800174 struct hlist_head *bucket;
175
Jesse Grossccb13522011-10-25 19:26:31 -0700176 vport = vport_ops_list[i]->create(parms);
177 if (IS_ERR(vport)) {
178 err = PTR_ERR(vport);
179 goto out;
180 }
181
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800182 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
183 vport->ops->get_name(vport));
184 hlist_add_head_rcu(&vport->hash_node, bucket);
Jesse Grossccb13522011-10-25 19:26:31 -0700185 return vport;
186 }
187 }
188
189 err = -EAFNOSUPPORT;
190
191out:
192 return ERR_PTR(err);
193}
194
195/**
196 * ovs_vport_set_options - modify existing vport device (for kernel callers)
197 *
198 * @vport: vport to modify.
199 * @port: New configuration.
200 *
201 * Modifies an existing device with the specified configuration (which is
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700202 * dependent on device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700203 */
204int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
205{
Jesse Grossccb13522011-10-25 19:26:31 -0700206 if (!vport->ops->set_options)
207 return -EOPNOTSUPP;
208 return vport->ops->set_options(vport, options);
209}
210
211/**
212 * ovs_vport_del - delete existing vport device
213 *
214 * @vport: vport to delete.
215 *
216 * Detaches @vport from its datapath and destroys it. It is possible to fail
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700217 * for reasons such as lack of memory. ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700218 */
219void ovs_vport_del(struct vport *vport)
220{
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700221 ASSERT_OVSL();
Jesse Grossccb13522011-10-25 19:26:31 -0700222
223 hlist_del_rcu(&vport->hash_node);
224
225 vport->ops->destroy(vport);
226}
227
228/**
229 * ovs_vport_get_stats - retrieve device stats
230 *
231 * @vport: vport from which to retrieve the stats
232 * @stats: location to store stats
233 *
234 * Retrieves transmit, receive, and error stats for the given device.
235 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700236 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700237 */
238void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
239{
240 int i;
241
242 memset(stats, 0, sizeof(*stats));
243
244 /* We potentially have 2 sources of stats that need to be combined:
245 * those we have collected (split into err_stats and percpu_stats) from
246 * set_stats() and device error stats from netdev->get_stats() (for
247 * errors that happen downstream and therefore aren't reported through
248 * our vport_record_error() function).
249 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
250 * netdev-stats can be directly read over netlink-ioctl.
251 */
252
253 spin_lock_bh(&vport->stats_lock);
254
255 stats->rx_errors = vport->err_stats.rx_errors;
256 stats->tx_errors = vport->err_stats.tx_errors;
257 stats->tx_dropped = vport->err_stats.tx_dropped;
258 stats->rx_dropped = vport->err_stats.rx_dropped;
259
260 spin_unlock_bh(&vport->stats_lock);
261
262 for_each_possible_cpu(i) {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700263 const struct pcpu_tstats *percpu_stats;
264 struct pcpu_tstats local_stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700265 unsigned int start;
266
267 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
268
269 do {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700270 start = u64_stats_fetch_begin_bh(&percpu_stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700271 local_stats = *percpu_stats;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700272 } while (u64_stats_fetch_retry_bh(&percpu_stats->syncp, start));
Jesse Grossccb13522011-10-25 19:26:31 -0700273
274 stats->rx_bytes += local_stats.rx_bytes;
275 stats->rx_packets += local_stats.rx_packets;
276 stats->tx_bytes += local_stats.tx_bytes;
277 stats->tx_packets += local_stats.tx_packets;
278 }
279}
280
281/**
282 * ovs_vport_get_options - retrieve device options
283 *
284 * @vport: vport from which to retrieve the options.
285 * @skb: sk_buff where options should be appended.
286 *
287 * Retrieves the configuration of the given device, appending an
288 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
289 * vport-specific attributes to @skb.
290 *
291 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
292 * negative error code if a real error occurred. If an error occurs, @skb is
293 * left unmodified.
294 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700295 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700296 */
297int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
298{
299 struct nlattr *nla;
Thomas Graf5d963352013-04-03 00:30:43 +0200300 int err;
301
302 if (!vport->ops->get_options)
303 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700304
305 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
306 if (!nla)
307 return -EMSGSIZE;
308
Thomas Graf5d963352013-04-03 00:30:43 +0200309 err = vport->ops->get_options(vport, skb);
310 if (err) {
311 nla_nest_cancel(skb, nla);
312 return err;
Jesse Grossccb13522011-10-25 19:26:31 -0700313 }
314
315 nla_nest_end(skb, nla);
316 return 0;
317}
318
319/**
320 * ovs_vport_receive - pass up received packet to the datapath for processing
321 *
322 * @vport: vport that received the packet
323 * @skb: skb that was received
324 *
325 * Must be called with rcu_read_lock. The packet cannot be shared and
Cong Wangd176ca22013-02-22 19:41:26 +0800326 * skb->data should point to the Ethernet header.
Jesse Grossccb13522011-10-25 19:26:31 -0700327 */
328void ovs_vport_receive(struct vport *vport, struct sk_buff *skb)
329{
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700330 struct pcpu_tstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700331
Shan Wei404f2f12012-11-13 09:52:25 +0800332 stats = this_cpu_ptr(vport->percpu_stats);
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700333 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700334 stats->rx_packets++;
335 stats->rx_bytes += skb->len;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700336 u64_stats_update_end(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700337
338 ovs_dp_process_received_packet(vport, skb);
339}
340
341/**
342 * ovs_vport_send - send a packet on a device
343 *
344 * @vport: vport on which to send the packet
345 * @skb: skb to send
346 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700347 * Sends the given packet and returns the length of data sent. Either ovs
Jesse Grossccb13522011-10-25 19:26:31 -0700348 * lock or rcu_read_lock must be held.
349 */
350int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
351{
352 int sent = vport->ops->send(vport, skb);
353
354 if (likely(sent)) {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700355 struct pcpu_tstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700356
Shan Wei404f2f12012-11-13 09:52:25 +0800357 stats = this_cpu_ptr(vport->percpu_stats);
Jesse Grossccb13522011-10-25 19:26:31 -0700358
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700359 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700360 stats->tx_packets++;
361 stats->tx_bytes += sent;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700362 u64_stats_update_end(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700363 }
364 return sent;
365}
366
367/**
368 * ovs_vport_record_error - indicate device error to generic stats layer
369 *
370 * @vport: vport that encountered the error
371 * @err_type: one of enum vport_err_type types to indicate the error type
372 *
373 * If using the vport generic stats layer indicate that an error of the given
374 * type has occured.
375 */
376void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type)
377{
378 spin_lock(&vport->stats_lock);
379
380 switch (err_type) {
381 case VPORT_E_RX_DROPPED:
382 vport->err_stats.rx_dropped++;
383 break;
384
385 case VPORT_E_RX_ERROR:
386 vport->err_stats.rx_errors++;
387 break;
388
389 case VPORT_E_TX_DROPPED:
390 vport->err_stats.tx_dropped++;
391 break;
392
393 case VPORT_E_TX_ERROR:
394 vport->err_stats.tx_errors++;
395 break;
Peter Senna Tschudina2bf91b2012-09-18 07:10:44 +0000396 }
Jesse Grossccb13522011-10-25 19:26:31 -0700397
398 spin_unlock(&vport->stats_lock);
399}