blob: 03779e8a262289f9a8178e62e0adf5afc16a9ae5 [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
43/* Protected by RCU read lock for reading, RTNL lock for writing. */
44static 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 *
83 * Must be called with RTNL or RCU read lock.
84 */
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;
89 struct hlist_node *node;
90
91 hlist_for_each_entry_rcu(vport, node, bucket, hash_node)
Pravin B Shelar46df7b82012-02-22 19:58:59 -080092 if (!strcmp(name, vport->ops->get_name(vport)) &&
93 net_eq(ovs_dp_get_net(vport->dp), net))
Jesse Grossccb13522011-10-25 19:26:31 -070094 return vport;
95
96 return NULL;
97}
98
99/**
100 * ovs_vport_alloc - allocate and initialize new vport
101 *
102 * @priv_size: Size of private data area to allocate.
103 * @ops: vport device ops
104 *
105 * Allocate and initialize a new vport defined by @ops. The vport will contain
106 * a private data area of size @priv_size that can be accessed using
107 * vport_priv(). vports that are no longer needed should be released with
108 * vport_free().
109 */
110struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
111 const struct vport_parms *parms)
112{
113 struct vport *vport;
114 size_t alloc_size;
115
116 alloc_size = sizeof(struct vport);
117 if (priv_size) {
118 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
119 alloc_size += priv_size;
120 }
121
122 vport = kzalloc(alloc_size, GFP_KERNEL);
123 if (!vport)
124 return ERR_PTR(-ENOMEM);
125
126 vport->dp = parms->dp;
127 vport->port_no = parms->port_no;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000128 vport->upcall_portid = parms->upcall_portid;
Jesse Grossccb13522011-10-25 19:26:31 -0700129 vport->ops = ops;
Pravin B Shelar15eac2a2012-08-23 12:40:54 -0700130 INIT_HLIST_NODE(&vport->dp_hash_node);
Jesse Grossccb13522011-10-25 19:26:31 -0700131
132 vport->percpu_stats = alloc_percpu(struct vport_percpu_stats);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000133 if (!vport->percpu_stats) {
134 kfree(vport);
Jesse Grossccb13522011-10-25 19:26:31 -0700135 return ERR_PTR(-ENOMEM);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000136 }
Jesse Grossccb13522011-10-25 19:26:31 -0700137
138 spin_lock_init(&vport->stats_lock);
139
140 return vport;
141}
142
143/**
144 * ovs_vport_free - uninitialize and free vport
145 *
146 * @vport: vport to free
147 *
148 * Frees a vport allocated with vport_alloc() when it is no longer needed.
149 *
150 * The caller must ensure that an RCU grace period has passed since the last
151 * time @vport was in a datapath.
152 */
153void ovs_vport_free(struct vport *vport)
154{
155 free_percpu(vport->percpu_stats);
156 kfree(vport);
157}
158
159/**
160 * ovs_vport_add - add vport device (for kernel callers)
161 *
162 * @parms: Information about new vport.
163 *
164 * Creates a new vport with the specified configuration (which is dependent on
165 * device type). RTNL lock must be held.
166 */
167struct vport *ovs_vport_add(const struct vport_parms *parms)
168{
169 struct vport *vport;
170 int err = 0;
171 int i;
172
173 ASSERT_RTNL();
174
175 for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
176 if (vport_ops_list[i]->type == parms->type) {
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800177 struct hlist_head *bucket;
178
Jesse Grossccb13522011-10-25 19:26:31 -0700179 vport = vport_ops_list[i]->create(parms);
180 if (IS_ERR(vport)) {
181 err = PTR_ERR(vport);
182 goto out;
183 }
184
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800185 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
186 vport->ops->get_name(vport));
187 hlist_add_head_rcu(&vport->hash_node, bucket);
Jesse Grossccb13522011-10-25 19:26:31 -0700188 return vport;
189 }
190 }
191
192 err = -EAFNOSUPPORT;
193
194out:
195 return ERR_PTR(err);
196}
197
198/**
199 * ovs_vport_set_options - modify existing vport device (for kernel callers)
200 *
201 * @vport: vport to modify.
202 * @port: New configuration.
203 *
204 * Modifies an existing device with the specified configuration (which is
205 * dependent on device type). RTNL lock must be held.
206 */
207int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
208{
209 ASSERT_RTNL();
210
211 if (!vport->ops->set_options)
212 return -EOPNOTSUPP;
213 return vport->ops->set_options(vport, options);
214}
215
216/**
217 * ovs_vport_del - delete existing vport device
218 *
219 * @vport: vport to delete.
220 *
221 * Detaches @vport from its datapath and destroys it. It is possible to fail
222 * for reasons such as lack of memory. RTNL lock must be held.
223 */
224void ovs_vport_del(struct vport *vport)
225{
226 ASSERT_RTNL();
227
228 hlist_del_rcu(&vport->hash_node);
229
230 vport->ops->destroy(vport);
231}
232
233/**
234 * ovs_vport_get_stats - retrieve device stats
235 *
236 * @vport: vport from which to retrieve the stats
237 * @stats: location to store stats
238 *
239 * Retrieves transmit, receive, and error stats for the given device.
240 *
241 * Must be called with RTNL lock or rcu_read_lock.
242 */
243void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
244{
245 int i;
246
247 memset(stats, 0, sizeof(*stats));
248
249 /* We potentially have 2 sources of stats that need to be combined:
250 * those we have collected (split into err_stats and percpu_stats) from
251 * set_stats() and device error stats from netdev->get_stats() (for
252 * errors that happen downstream and therefore aren't reported through
253 * our vport_record_error() function).
254 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
255 * netdev-stats can be directly read over netlink-ioctl.
256 */
257
258 spin_lock_bh(&vport->stats_lock);
259
260 stats->rx_errors = vport->err_stats.rx_errors;
261 stats->tx_errors = vport->err_stats.tx_errors;
262 stats->tx_dropped = vport->err_stats.tx_dropped;
263 stats->rx_dropped = vport->err_stats.rx_dropped;
264
265 spin_unlock_bh(&vport->stats_lock);
266
267 for_each_possible_cpu(i) {
268 const struct vport_percpu_stats *percpu_stats;
269 struct vport_percpu_stats local_stats;
270 unsigned int start;
271
272 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
273
274 do {
275 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
276 local_stats = *percpu_stats;
277 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
278
279 stats->rx_bytes += local_stats.rx_bytes;
280 stats->rx_packets += local_stats.rx_packets;
281 stats->tx_bytes += local_stats.tx_bytes;
282 stats->tx_packets += local_stats.tx_packets;
283 }
284}
285
286/**
287 * ovs_vport_get_options - retrieve device options
288 *
289 * @vport: vport from which to retrieve the options.
290 * @skb: sk_buff where options should be appended.
291 *
292 * Retrieves the configuration of the given device, appending an
293 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
294 * vport-specific attributes to @skb.
295 *
296 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
297 * negative error code if a real error occurred. If an error occurs, @skb is
298 * left unmodified.
299 *
300 * Must be called with RTNL lock or rcu_read_lock.
301 */
302int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
303{
304 struct nlattr *nla;
305
306 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
307 if (!nla)
308 return -EMSGSIZE;
309
310 if (vport->ops->get_options) {
311 int err = vport->ops->get_options(vport, skb);
312 if (err) {
313 nla_nest_cancel(skb, nla);
314 return err;
315 }
316 }
317
318 nla_nest_end(skb, nla);
319 return 0;
320}
321
322/**
323 * ovs_vport_receive - pass up received packet to the datapath for processing
324 *
325 * @vport: vport that received the packet
326 * @skb: skb that was received
327 *
328 * Must be called with rcu_read_lock. The packet cannot be shared and
329 * skb->data should point to the Ethernet header. The caller must have already
330 * called compute_ip_summed() to initialize the checksumming fields.
331 */
332void ovs_vport_receive(struct vport *vport, struct sk_buff *skb)
333{
334 struct vport_percpu_stats *stats;
335
336 stats = per_cpu_ptr(vport->percpu_stats, smp_processor_id());
337
338 u64_stats_update_begin(&stats->sync);
339 stats->rx_packets++;
340 stats->rx_bytes += skb->len;
341 u64_stats_update_end(&stats->sync);
342
343 ovs_dp_process_received_packet(vport, skb);
344}
345
346/**
347 * ovs_vport_send - send a packet on a device
348 *
349 * @vport: vport on which to send the packet
350 * @skb: skb to send
351 *
352 * Sends the given packet and returns the length of data sent. Either RTNL
353 * lock or rcu_read_lock must be held.
354 */
355int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
356{
357 int sent = vport->ops->send(vport, skb);
358
359 if (likely(sent)) {
360 struct vport_percpu_stats *stats;
361
362 stats = per_cpu_ptr(vport->percpu_stats, smp_processor_id());
363
364 u64_stats_update_begin(&stats->sync);
365 stats->tx_packets++;
366 stats->tx_bytes += sent;
367 u64_stats_update_end(&stats->sync);
368 }
369 return sent;
370}
371
372/**
373 * ovs_vport_record_error - indicate device error to generic stats layer
374 *
375 * @vport: vport that encountered the error
376 * @err_type: one of enum vport_err_type types to indicate the error type
377 *
378 * If using the vport generic stats layer indicate that an error of the given
379 * type has occured.
380 */
381void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type)
382{
383 spin_lock(&vport->stats_lock);
384
385 switch (err_type) {
386 case VPORT_E_RX_DROPPED:
387 vport->err_stats.rx_dropped++;
388 break;
389
390 case VPORT_E_RX_ERROR:
391 vport->err_stats.rx_errors++;
392 break;
393
394 case VPORT_E_TX_DROPPED:
395 vport->err_stats.tx_dropped++;
396 break;
397
398 case VPORT_E_TX_ERROR:
399 vport->err_stats.tx_errors++;
400 break;
Peter Senna Tschudina2bf91b2012-09-18 07:10:44 +0000401 }
Jesse Grossccb13522011-10-25 19:26:31 -0700402
403 spin_unlock(&vport->stats_lock);
404}