blob: 702fb21bfe15bd6f3b0deb1678ccaf21d27f1b71 [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
Stephen Hemminger443cd882013-12-17 19:22:48 +000036static void ovs_vport_record_error(struct vport *,
37 enum vport_err_type err_type);
38
Jesse Grossccb13522011-10-25 19:26:31 -070039/* List of statically compiled vport implementations. Don't forget to also
40 * add yours to the list at the bottom of vport.h. */
41static const struct vport_ops *vport_ops_list[] = {
42 &ovs_netdev_vport_ops,
43 &ovs_internal_vport_ops,
Pravin B Shelaraa310702013-06-17 17:50:33 -070044
Pravin B Shelarfb825a52013-06-28 16:07:40 -070045#ifdef CONFIG_OPENVSWITCH_GRE
Pravin B Shelaraa310702013-06-17 17:50:33 -070046 &ovs_gre_vport_ops,
47#endif
Pravin B Shelar58264842013-08-19 11:23:34 -070048#ifdef CONFIG_OPENVSWITCH_VXLAN
49 &ovs_vxlan_vport_ops,
50#endif
Jesse Grossccb13522011-10-25 19:26:31 -070051};
52
Pravin B Shelar8e4e1712013-04-15 13:23:03 -070053/* Protected by RCU read lock for reading, ovs_mutex for writing. */
Jesse Grossccb13522011-10-25 19:26:31 -070054static struct hlist_head *dev_table;
55#define VPORT_HASH_BUCKETS 1024
56
57/**
58 * ovs_vport_init - initialize vport subsystem
59 *
60 * Called at module load time to initialize the vport subsystem.
61 */
62int ovs_vport_init(void)
63{
64 dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
65 GFP_KERNEL);
66 if (!dev_table)
67 return -ENOMEM;
68
69 return 0;
70}
71
72/**
73 * ovs_vport_exit - shutdown vport subsystem
74 *
75 * Called at module exit time to shutdown the vport subsystem.
76 */
77void ovs_vport_exit(void)
78{
79 kfree(dev_table);
80}
81
Pravin B Shelar46df7b82012-02-22 19:58:59 -080082static struct hlist_head *hash_bucket(struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -070083{
Pravin B Shelar46df7b82012-02-22 19:58:59 -080084 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
Jesse Grossccb13522011-10-25 19:26:31 -070085 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
86}
87
88/**
89 * ovs_vport_locate - find a port that has already been created
90 *
91 * @name: name of port to find
92 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -070093 * Must be called with ovs or RCU read lock.
Jesse Grossccb13522011-10-25 19:26:31 -070094 */
Pravin B Shelar46df7b82012-02-22 19:58:59 -080095struct vport *ovs_vport_locate(struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -070096{
Pravin B Shelar46df7b82012-02-22 19:58:59 -080097 struct hlist_head *bucket = hash_bucket(net, name);
Jesse Grossccb13522011-10-25 19:26:31 -070098 struct vport *vport;
Jesse Grossccb13522011-10-25 19:26:31 -070099
Sasha Levinb67bfe02013-02-27 17:06:00 -0800100 hlist_for_each_entry_rcu(vport, bucket, hash_node)
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800101 if (!strcmp(name, vport->ops->get_name(vport)) &&
102 net_eq(ovs_dp_get_net(vport->dp), net))
Jesse Grossccb13522011-10-25 19:26:31 -0700103 return vport;
104
105 return NULL;
106}
107
108/**
109 * ovs_vport_alloc - allocate and initialize new vport
110 *
111 * @priv_size: Size of private data area to allocate.
112 * @ops: vport device ops
113 *
114 * Allocate and initialize a new vport defined by @ops. The vport will contain
115 * a private data area of size @priv_size that can be accessed using
116 * vport_priv(). vports that are no longer needed should be released with
117 * vport_free().
118 */
119struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
120 const struct vport_parms *parms)
121{
122 struct vport *vport;
123 size_t alloc_size;
124
125 alloc_size = sizeof(struct vport);
126 if (priv_size) {
127 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
128 alloc_size += priv_size;
129 }
130
131 vport = kzalloc(alloc_size, GFP_KERNEL);
132 if (!vport)
133 return ERR_PTR(-ENOMEM);
134
135 vport->dp = parms->dp;
136 vport->port_no = parms->port_no;
Jesse Grossccb13522011-10-25 19:26:31 -0700137 vport->ops = ops;
Pravin B Shelar15eac2a2012-08-23 12:40:54 -0700138 INIT_HLIST_NODE(&vport->dp_hash_node);
Jesse Grossccb13522011-10-25 19:26:31 -0700139
Alex Wang5cd667b2014-07-17 15:14:13 -0700140 if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids))
141 return ERR_PTR(-EINVAL);
142
WANG Cong1c213bd2014-02-13 11:46:28 -0800143 vport->percpu_stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000144 if (!vport->percpu_stats) {
145 kfree(vport);
Jesse Grossccb13522011-10-25 19:26:31 -0700146 return ERR_PTR(-ENOMEM);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000147 }
Jesse Grossccb13522011-10-25 19:26:31 -0700148
149 spin_lock_init(&vport->stats_lock);
150
151 return vport;
152}
153
154/**
155 * ovs_vport_free - uninitialize and free vport
156 *
157 * @vport: vport to free
158 *
159 * Frees a vport allocated with vport_alloc() when it is no longer needed.
160 *
161 * The caller must ensure that an RCU grace period has passed since the last
162 * time @vport was in a datapath.
163 */
164void ovs_vport_free(struct vport *vport)
165{
Alex Wang5cd667b2014-07-17 15:14:13 -0700166 /* vport is freed from RCU callback or error path, Therefore
167 * it is safe to use raw dereference.
168 */
169 kfree(rcu_dereference_raw(vport->upcall_portids));
Jesse Grossccb13522011-10-25 19:26:31 -0700170 free_percpu(vport->percpu_stats);
171 kfree(vport);
172}
173
174/**
175 * ovs_vport_add - add vport device (for kernel callers)
176 *
177 * @parms: Information about new vport.
178 *
179 * Creates a new vport with the specified configuration (which is dependent on
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700180 * device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700181 */
182struct vport *ovs_vport_add(const struct vport_parms *parms)
183{
184 struct vport *vport;
185 int err = 0;
186 int i;
187
Jesse Grossccb13522011-10-25 19:26:31 -0700188 for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
189 if (vport_ops_list[i]->type == parms->type) {
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800190 struct hlist_head *bucket;
191
Jesse Grossccb13522011-10-25 19:26:31 -0700192 vport = vport_ops_list[i]->create(parms);
193 if (IS_ERR(vport)) {
194 err = PTR_ERR(vport);
195 goto out;
196 }
197
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800198 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
199 vport->ops->get_name(vport));
200 hlist_add_head_rcu(&vport->hash_node, bucket);
Jesse Grossccb13522011-10-25 19:26:31 -0700201 return vport;
202 }
203 }
204
205 err = -EAFNOSUPPORT;
206
207out:
208 return ERR_PTR(err);
209}
210
211/**
212 * ovs_vport_set_options - modify existing vport device (for kernel callers)
213 *
214 * @vport: vport to modify.
Justin Pettit26948382013-08-19 17:49:29 -0700215 * @options: New configuration.
Jesse Grossccb13522011-10-25 19:26:31 -0700216 *
217 * Modifies an existing device with the specified configuration (which is
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700218 * dependent on device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700219 */
220int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
221{
Jesse Grossccb13522011-10-25 19:26:31 -0700222 if (!vport->ops->set_options)
223 return -EOPNOTSUPP;
224 return vport->ops->set_options(vport, options);
225}
226
227/**
228 * ovs_vport_del - delete existing vport device
229 *
230 * @vport: vport to delete.
231 *
232 * Detaches @vport from its datapath and destroys it. It is possible to fail
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700233 * for reasons such as lack of memory. ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700234 */
235void ovs_vport_del(struct vport *vport)
236{
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700237 ASSERT_OVSL();
Jesse Grossccb13522011-10-25 19:26:31 -0700238
239 hlist_del_rcu(&vport->hash_node);
240
241 vport->ops->destroy(vport);
242}
243
244/**
245 * ovs_vport_get_stats - retrieve device stats
246 *
247 * @vport: vport from which to retrieve the stats
248 * @stats: location to store stats
249 *
250 * Retrieves transmit, receive, and error stats for the given device.
251 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700252 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700253 */
254void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
255{
256 int i;
257
258 memset(stats, 0, sizeof(*stats));
259
260 /* We potentially have 2 sources of stats that need to be combined:
261 * those we have collected (split into err_stats and percpu_stats) from
262 * set_stats() and device error stats from netdev->get_stats() (for
263 * errors that happen downstream and therefore aren't reported through
264 * our vport_record_error() function).
265 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
266 * netdev-stats can be directly read over netlink-ioctl.
267 */
268
269 spin_lock_bh(&vport->stats_lock);
270
271 stats->rx_errors = vport->err_stats.rx_errors;
272 stats->tx_errors = vport->err_stats.tx_errors;
273 stats->tx_dropped = vport->err_stats.tx_dropped;
274 stats->rx_dropped = vport->err_stats.rx_dropped;
275
276 spin_unlock_bh(&vport->stats_lock);
277
278 for_each_possible_cpu(i) {
Li RongQing8f849852014-01-04 13:57:59 +0800279 const struct pcpu_sw_netstats *percpu_stats;
280 struct pcpu_sw_netstats local_stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700281 unsigned int start;
282
283 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
284
285 do {
Eric W. Biederman57a77442014-03-13 21:26:42 -0700286 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700287 local_stats = *percpu_stats;
Eric W. Biederman57a77442014-03-13 21:26:42 -0700288 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
Jesse Grossccb13522011-10-25 19:26:31 -0700289
290 stats->rx_bytes += local_stats.rx_bytes;
291 stats->rx_packets += local_stats.rx_packets;
292 stats->tx_bytes += local_stats.tx_bytes;
293 stats->tx_packets += local_stats.tx_packets;
294 }
295}
296
297/**
298 * ovs_vport_get_options - retrieve device options
299 *
300 * @vport: vport from which to retrieve the options.
301 * @skb: sk_buff where options should be appended.
302 *
303 * Retrieves the configuration of the given device, appending an
304 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
305 * vport-specific attributes to @skb.
306 *
307 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
308 * negative error code if a real error occurred. If an error occurs, @skb is
309 * left unmodified.
310 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700311 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700312 */
313int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
314{
315 struct nlattr *nla;
Thomas Graf5d963352013-04-03 00:30:43 +0200316 int err;
317
318 if (!vport->ops->get_options)
319 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700320
321 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
322 if (!nla)
323 return -EMSGSIZE;
324
Thomas Graf5d963352013-04-03 00:30:43 +0200325 err = vport->ops->get_options(vport, skb);
326 if (err) {
327 nla_nest_cancel(skb, nla);
328 return err;
Jesse Grossccb13522011-10-25 19:26:31 -0700329 }
330
331 nla_nest_end(skb, nla);
332 return 0;
333}
334
335/**
Alex Wang5cd667b2014-07-17 15:14:13 -0700336 * ovs_vport_set_upcall_portids - set upcall portids of @vport.
337 *
338 * @vport: vport to modify.
339 * @ids: new configuration, an array of port ids.
340 *
341 * Sets the vport's upcall_portids to @ids.
342 *
343 * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
344 * as an array of U32.
345 *
346 * Must be called with ovs_mutex.
347 */
348int ovs_vport_set_upcall_portids(struct vport *vport, struct nlattr *ids)
349{
350 struct vport_portids *old, *vport_portids;
351
352 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
353 return -EINVAL;
354
355 old = ovsl_dereference(vport->upcall_portids);
356
357 vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),
358 GFP_KERNEL);
359 if (!vport_portids)
360 return -ENOMEM;
361
362 vport_portids->n_ids = nla_len(ids) / sizeof(u32);
363 vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
364 nla_memcpy(vport_portids->ids, ids, nla_len(ids));
365
366 rcu_assign_pointer(vport->upcall_portids, vport_portids);
367
368 if (old)
369 kfree_rcu(old, rcu);
370 return 0;
371}
372
373/**
374 * ovs_vport_get_upcall_portids - get the upcall_portids of @vport.
375 *
376 * @vport: vport from which to retrieve the portids.
377 * @skb: sk_buff where portids should be appended.
378 *
379 * Retrieves the configuration of the given vport, appending the
380 * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall
381 * portids to @skb.
382 *
383 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room.
384 * If an error occurs, @skb is left unmodified. Must be called with
385 * ovs_mutex or rcu_read_lock.
386 */
387int ovs_vport_get_upcall_portids(const struct vport *vport,
388 struct sk_buff *skb)
389{
390 struct vport_portids *ids;
391
392 ids = rcu_dereference_ovsl(vport->upcall_portids);
393
394 if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS)
395 return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID,
396 ids->n_ids * sizeof(u32), (void *)ids->ids);
397 else
398 return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]);
399}
400
401/**
402 * ovs_vport_find_upcall_portid - find the upcall portid to send upcall.
403 *
404 * @vport: vport from which the missed packet is received.
405 * @skb: skb that the missed packet was received.
406 *
407 * Uses the skb_get_hash() to select the upcall portid to send the
408 * upcall.
409 *
410 * Returns the portid of the target socket. Must be called with rcu_read_lock.
411 */
412u32 ovs_vport_find_upcall_portid(const struct vport *p, struct sk_buff *skb)
413{
414 struct vport_portids *ids;
415 u32 ids_index;
416 u32 hash;
417
418 ids = rcu_dereference(p->upcall_portids);
419
420 if (ids->n_ids == 1 && ids->ids[0] == 0)
421 return 0;
422
423 hash = skb_get_hash(skb);
424 ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids);
425 return ids->ids[ids_index];
426}
427
428/**
Jesse Grossccb13522011-10-25 19:26:31 -0700429 * ovs_vport_receive - pass up received packet to the datapath for processing
430 *
431 * @vport: vport that received the packet
432 * @skb: skb that was received
Justin Pettit26948382013-08-19 17:49:29 -0700433 * @tun_key: tunnel (if any) that carried packet
Jesse Grossccb13522011-10-25 19:26:31 -0700434 *
435 * Must be called with rcu_read_lock. The packet cannot be shared and
Cong Wangd176ca22013-02-22 19:41:26 +0800436 * skb->data should point to the Ethernet header.
Jesse Grossccb13522011-10-25 19:26:31 -0700437 */
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700438void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
439 struct ovs_key_ipv4_tunnel *tun_key)
Jesse Grossccb13522011-10-25 19:26:31 -0700440{
Li RongQing8f849852014-01-04 13:57:59 +0800441 struct pcpu_sw_netstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700442
Shan Wei404f2f12012-11-13 09:52:25 +0800443 stats = this_cpu_ptr(vport->percpu_stats);
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700444 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700445 stats->rx_packets++;
446 stats->rx_bytes += skb->len;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700447 u64_stats_update_end(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700448
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700449 OVS_CB(skb)->tun_key = tun_key;
Jesse Grossccb13522011-10-25 19:26:31 -0700450 ovs_dp_process_received_packet(vport, skb);
451}
452
453/**
454 * ovs_vport_send - send a packet on a device
455 *
456 * @vport: vport on which to send the packet
457 * @skb: skb to send
458 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700459 * Sends the given packet and returns the length of data sent. Either ovs
Jesse Grossccb13522011-10-25 19:26:31 -0700460 * lock or rcu_read_lock must be held.
461 */
462int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
463{
464 int sent = vport->ops->send(vport, skb);
465
Pravin B Shelar91b75142013-05-13 08:22:34 -0700466 if (likely(sent > 0)) {
Li RongQing8f849852014-01-04 13:57:59 +0800467 struct pcpu_sw_netstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700468
Shan Wei404f2f12012-11-13 09:52:25 +0800469 stats = this_cpu_ptr(vport->percpu_stats);
Jesse Grossccb13522011-10-25 19:26:31 -0700470
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700471 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700472 stats->tx_packets++;
473 stats->tx_bytes += sent;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700474 u64_stats_update_end(&stats->syncp);
Pravin B Shelar91b75142013-05-13 08:22:34 -0700475 } else if (sent < 0) {
476 ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
477 kfree_skb(skb);
478 } else
479 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
480
Jesse Grossccb13522011-10-25 19:26:31 -0700481 return sent;
482}
483
484/**
485 * ovs_vport_record_error - indicate device error to generic stats layer
486 *
487 * @vport: vport that encountered the error
488 * @err_type: one of enum vport_err_type types to indicate the error type
489 *
490 * If using the vport generic stats layer indicate that an error of the given
Andy Hillaf784162013-06-07 16:53:50 -0700491 * type has occurred.
Jesse Grossccb13522011-10-25 19:26:31 -0700492 */
Stephen Hemminger443cd882013-12-17 19:22:48 +0000493static void ovs_vport_record_error(struct vport *vport,
494 enum vport_err_type err_type)
Jesse Grossccb13522011-10-25 19:26:31 -0700495{
496 spin_lock(&vport->stats_lock);
497
498 switch (err_type) {
499 case VPORT_E_RX_DROPPED:
500 vport->err_stats.rx_dropped++;
501 break;
502
503 case VPORT_E_RX_ERROR:
504 vport->err_stats.rx_errors++;
505 break;
506
507 case VPORT_E_TX_DROPPED:
508 vport->err_stats.tx_dropped++;
509 break;
510
511 case VPORT_E_TX_ERROR:
512 vport->err_stats.tx_errors++;
513 break;
Peter Senna Tschudina2bf91b2012-09-18 07:10:44 +0000514 }
Jesse Grossccb13522011-10-25 19:26:31 -0700515
516 spin_unlock(&vport->stats_lock);
517}
Pravin B Shelaraa310702013-06-17 17:50:33 -0700518
519static void free_vport_rcu(struct rcu_head *rcu)
520{
521 struct vport *vport = container_of(rcu, struct vport, rcu);
522
523 ovs_vport_free(vport);
524}
525
526void ovs_vport_deferred_free(struct vport *vport)
527{
528 if (!vport)
529 return;
530
531 call_rcu(&vport->rcu, free_vport_rcu);
532}