blob: 71a2de8726cb65bca80ca14fbd2cec58f8d165d5 [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;
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
131 vport->percpu_stats = alloc_percpu(struct vport_percpu_stats);
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
164 * device type). RTNL lock must be held.
165 */
166struct vport *ovs_vport_add(const struct vport_parms *parms)
167{
168 struct vport *vport;
169 int err = 0;
170 int i;
171
172 ASSERT_RTNL();
173
174 for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
175 if (vport_ops_list[i]->type == parms->type) {
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800176 struct hlist_head *bucket;
177
Jesse Grossccb13522011-10-25 19:26:31 -0700178 vport = vport_ops_list[i]->create(parms);
179 if (IS_ERR(vport)) {
180 err = PTR_ERR(vport);
181 goto out;
182 }
183
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800184 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
185 vport->ops->get_name(vport));
186 hlist_add_head_rcu(&vport->hash_node, bucket);
Jesse Grossccb13522011-10-25 19:26:31 -0700187 return vport;
188 }
189 }
190
191 err = -EAFNOSUPPORT;
192
193out:
194 return ERR_PTR(err);
195}
196
197/**
198 * ovs_vport_set_options - modify existing vport device (for kernel callers)
199 *
200 * @vport: vport to modify.
201 * @port: New configuration.
202 *
203 * Modifies an existing device with the specified configuration (which is
204 * dependent on device type). RTNL lock must be held.
205 */
206int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
207{
208 ASSERT_RTNL();
209
210 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
221 * for reasons such as lack of memory. RTNL lock must be held.
222 */
223void ovs_vport_del(struct vport *vport)
224{
225 ASSERT_RTNL();
226
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 *
240 * Must be called with RTNL lock or rcu_read_lock.
241 */
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) {
267 const struct vport_percpu_stats *percpu_stats;
268 struct vport_percpu_stats local_stats;
269 unsigned int start;
270
271 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
272
273 do {
274 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
275 local_stats = *percpu_stats;
276 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
277
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 *
299 * Must be called with RTNL lock or rcu_read_lock.
300 */
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 */
332void ovs_vport_receive(struct vport *vport, struct sk_buff *skb)
333{
334 struct vport_percpu_stats *stats;
335
Shan Wei404f2f12012-11-13 09:52:25 +0800336 stats = this_cpu_ptr(vport->percpu_stats);
Jesse Grossccb13522011-10-25 19:26:31 -0700337 u64_stats_update_begin(&stats->sync);
338 stats->rx_packets++;
339 stats->rx_bytes += skb->len;
340 u64_stats_update_end(&stats->sync);
341
342 ovs_dp_process_received_packet(vport, skb);
343}
344
345/**
346 * ovs_vport_send - send a packet on a device
347 *
348 * @vport: vport on which to send the packet
349 * @skb: skb to send
350 *
351 * Sends the given packet and returns the length of data sent. Either RTNL
352 * lock or rcu_read_lock must be held.
353 */
354int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
355{
356 int sent = vport->ops->send(vport, skb);
357
358 if (likely(sent)) {
359 struct vport_percpu_stats *stats;
360
Shan Wei404f2f12012-11-13 09:52:25 +0800361 stats = this_cpu_ptr(vport->percpu_stats);
Jesse Grossccb13522011-10-25 19:26:31 -0700362
363 u64_stats_update_begin(&stats->sync);
364 stats->tx_packets++;
365 stats->tx_bytes += sent;
366 u64_stats_update_end(&stats->sync);
367 }
368 return sent;
369}
370
371/**
372 * ovs_vport_record_error - indicate device error to generic stats layer
373 *
374 * @vport: vport that encountered the error
375 * @err_type: one of enum vport_err_type types to indicate the error type
376 *
377 * If using the vport generic stats layer indicate that an error of the given
378 * type has occured.
379 */
380void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type)
381{
382 spin_lock(&vport->stats_lock);
383
384 switch (err_type) {
385 case VPORT_E_RX_DROPPED:
386 vport->err_stats.rx_dropped++;
387 break;
388
389 case VPORT_E_RX_ERROR:
390 vport->err_stats.rx_errors++;
391 break;
392
393 case VPORT_E_TX_DROPPED:
394 vport->err_stats.tx_dropped++;
395 break;
396
397 case VPORT_E_TX_ERROR:
398 vport->err_stats.tx_errors++;
399 break;
Peter Senna Tschudina2bf91b2012-09-18 07:10:44 +0000400 }
Jesse Grossccb13522011-10-25 19:26:31 -0700401
402 spin_unlock(&vport->stats_lock);
403}