blob: 6b21fd068d874f35c731e6424a1c7560c0038541 [file] [log] [blame]
Jesse Grossccb13522011-10-25 19:26:31 -07001/*
Pravin B Shelar83c8df22014-09-15 19:20:31 -07002 * Copyright (c) 2007-2014 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>
Thomas Graf62b9c8d2014-10-22 17:29:06 +020031#include <linux/module.h>
Jesse Grossccb13522011-10-25 19:26:31 -070032
Pravin B Shelar46df7b82012-02-22 19:58:59 -080033#include "datapath.h"
Jesse Grossccb13522011-10-25 19:26:31 -070034#include "vport.h"
35#include "vport-internal_dev.h"
36
Thomas Graf62b9c8d2014-10-22 17:29:06 +020037static LIST_HEAD(vport_ops_list);
Jesse Grossccb13522011-10-25 19:26:31 -070038
Pravin B Shelar8e4e1712013-04-15 13:23:03 -070039/* Protected by RCU read lock for reading, ovs_mutex for writing. */
Jesse Grossccb13522011-10-25 19:26:31 -070040static struct hlist_head *dev_table;
41#define VPORT_HASH_BUCKETS 1024
42
43/**
44 * ovs_vport_init - initialize vport subsystem
45 *
46 * Called at module load time to initialize the vport subsystem.
47 */
48int ovs_vport_init(void)
49{
50 dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
51 GFP_KERNEL);
52 if (!dev_table)
53 return -ENOMEM;
54
55 return 0;
56}
57
58/**
59 * ovs_vport_exit - shutdown vport subsystem
60 *
61 * Called at module exit time to shutdown the vport subsystem.
62 */
63void ovs_vport_exit(void)
64{
65 kfree(dev_table);
66}
67
Thomas Graf12eb18f2014-11-06 06:58:52 -080068static struct hlist_head *hash_bucket(const struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -070069{
Pravin B Shelar46df7b82012-02-22 19:58:59 -080070 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
Jesse Grossccb13522011-10-25 19:26:31 -070071 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
72}
73
Paolo Abeni83e4bf72015-11-30 12:31:43 +010074int __ovs_vport_ops_register(struct vport_ops *ops)
Thomas Graf62b9c8d2014-10-22 17:29:06 +020075{
76 int err = -EEXIST;
77 struct vport_ops *o;
78
79 ovs_lock();
80 list_for_each_entry(o, &vport_ops_list, list)
81 if (ops->type == o->type)
82 goto errout;
83
84 list_add_tail(&ops->list, &vport_ops_list);
85 err = 0;
86errout:
87 ovs_unlock();
88 return err;
89}
Paolo Abeni83e4bf72015-11-30 12:31:43 +010090EXPORT_SYMBOL_GPL(__ovs_vport_ops_register);
Thomas Graf62b9c8d2014-10-22 17:29:06 +020091
92void ovs_vport_ops_unregister(struct vport_ops *ops)
93{
94 ovs_lock();
95 list_del(&ops->list);
96 ovs_unlock();
97}
Pravin B Shelar9ba559d2014-11-06 06:44:27 -080098EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister);
Thomas Graf62b9c8d2014-10-22 17:29:06 +020099
Jesse Grossccb13522011-10-25 19:26:31 -0700100/**
101 * ovs_vport_locate - find a port that has already been created
102 *
103 * @name: name of port to find
104 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700105 * Must be called with ovs or RCU read lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700106 */
Thomas Graf12eb18f2014-11-06 06:58:52 -0800107struct vport *ovs_vport_locate(const struct net *net, const char *name)
Jesse Grossccb13522011-10-25 19:26:31 -0700108{
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800109 struct hlist_head *bucket = hash_bucket(net, name);
Jesse Grossccb13522011-10-25 19:26:31 -0700110 struct vport *vport;
Jesse Grossccb13522011-10-25 19:26:31 -0700111
Sasha Levinb67bfe02013-02-27 17:06:00 -0800112 hlist_for_each_entry_rcu(vport, bucket, hash_node)
Thomas Grafc9db9652015-07-21 10:44:05 +0200113 if (!strcmp(name, ovs_vport_name(vport)) &&
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800114 net_eq(ovs_dp_get_net(vport->dp), net))
Jesse Grossccb13522011-10-25 19:26:31 -0700115 return vport;
116
117 return NULL;
118}
119
120/**
121 * ovs_vport_alloc - allocate and initialize new vport
122 *
123 * @priv_size: Size of private data area to allocate.
124 * @ops: vport device ops
125 *
126 * Allocate and initialize a new vport defined by @ops. The vport will contain
127 * a private data area of size @priv_size that can be accessed using
128 * vport_priv(). vports that are no longer needed should be released with
129 * vport_free().
130 */
131struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
132 const struct vport_parms *parms)
133{
134 struct vport *vport;
135 size_t alloc_size;
136
137 alloc_size = sizeof(struct vport);
138 if (priv_size) {
139 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
140 alloc_size += priv_size;
141 }
142
143 vport = kzalloc(alloc_size, GFP_KERNEL);
144 if (!vport)
145 return ERR_PTR(-ENOMEM);
146
147 vport->dp = parms->dp;
148 vport->port_no = parms->port_no;
Jesse Grossccb13522011-10-25 19:26:31 -0700149 vport->ops = ops;
Pravin B Shelar15eac2a2012-08-23 12:40:54 -0700150 INIT_HLIST_NODE(&vport->dp_hash_node);
Jesse Grossccb13522011-10-25 19:26:31 -0700151
Christoph Jaeger3791b3f2014-08-12 09:27:57 +0200152 if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) {
153 kfree(vport);
Alex Wang5cd667b2014-07-17 15:14:13 -0700154 return ERR_PTR(-EINVAL);
Christoph Jaeger3791b3f2014-08-12 09:27:57 +0200155 }
Alex Wang5cd667b2014-07-17 15:14:13 -0700156
Jesse Grossccb13522011-10-25 19:26:31 -0700157 return vport;
158}
Pravin B Shelar9ba559d2014-11-06 06:44:27 -0800159EXPORT_SYMBOL_GPL(ovs_vport_alloc);
Jesse Grossccb13522011-10-25 19:26:31 -0700160
161/**
162 * ovs_vport_free - uninitialize and free vport
163 *
164 * @vport: vport to free
165 *
166 * Frees a vport allocated with vport_alloc() when it is no longer needed.
167 *
168 * The caller must ensure that an RCU grace period has passed since the last
169 * time @vport was in a datapath.
170 */
171void ovs_vport_free(struct vport *vport)
172{
Alex Wang5cd667b2014-07-17 15:14:13 -0700173 /* vport is freed from RCU callback or error path, Therefore
174 * it is safe to use raw dereference.
175 */
176 kfree(rcu_dereference_raw(vport->upcall_portids));
Jesse Grossccb13522011-10-25 19:26:31 -0700177 kfree(vport);
178}
Pravin B Shelar9ba559d2014-11-06 06:44:27 -0800179EXPORT_SYMBOL_GPL(ovs_vport_free);
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200180
181static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms)
182{
183 struct vport_ops *ops;
184
185 list_for_each_entry(ops, &vport_ops_list, list)
186 if (ops->type == parms->type)
187 return ops;
188
189 return NULL;
190}
Jesse Grossccb13522011-10-25 19:26:31 -0700191
192/**
193 * ovs_vport_add - add vport device (for kernel callers)
194 *
195 * @parms: Information about new vport.
196 *
197 * Creates a new vport with the specified configuration (which is dependent on
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700198 * device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700199 */
200struct vport *ovs_vport_add(const struct vport_parms *parms)
201{
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200202 struct vport_ops *ops;
Jesse Grossccb13522011-10-25 19:26:31 -0700203 struct vport *vport;
Jesse Grossccb13522011-10-25 19:26:31 -0700204
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200205 ops = ovs_vport_lookup(parms);
206 if (ops) {
207 struct hlist_head *bucket;
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800208
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200209 if (!try_module_get(ops->owner))
210 return ERR_PTR(-EAFNOSUPPORT);
Jesse Grossccb13522011-10-25 19:26:31 -0700211
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200212 vport = ops->create(parms);
213 if (IS_ERR(vport)) {
214 module_put(ops->owner);
Jesse Grossccb13522011-10-25 19:26:31 -0700215 return vport;
216 }
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200217
218 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
Thomas Grafc9db9652015-07-21 10:44:05 +0200219 ovs_vport_name(vport));
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200220 hlist_add_head_rcu(&vport->hash_node, bucket);
221 return vport;
Jesse Grossccb13522011-10-25 19:26:31 -0700222 }
223
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200224 /* Unlock to attempt module load and return -EAGAIN if load
225 * was successful as we need to restart the port addition
226 * workflow.
227 */
228 ovs_unlock();
229 request_module("vport-type-%d", parms->type);
230 ovs_lock();
Jesse Grossccb13522011-10-25 19:26:31 -0700231
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200232 if (!ovs_vport_lookup(parms))
233 return ERR_PTR(-EAFNOSUPPORT);
234 else
235 return ERR_PTR(-EAGAIN);
Jesse Grossccb13522011-10-25 19:26:31 -0700236}
237
238/**
239 * ovs_vport_set_options - modify existing vport device (for kernel callers)
240 *
241 * @vport: vport to modify.
Justin Pettit26948382013-08-19 17:49:29 -0700242 * @options: New configuration.
Jesse Grossccb13522011-10-25 19:26:31 -0700243 *
244 * Modifies an existing device with the specified configuration (which is
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700245 * dependent on device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700246 */
247int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
248{
Jesse Grossccb13522011-10-25 19:26:31 -0700249 if (!vport->ops->set_options)
250 return -EOPNOTSUPP;
251 return vport->ops->set_options(vport, options);
252}
253
254/**
255 * ovs_vport_del - delete existing vport device
256 *
257 * @vport: vport to delete.
258 *
Aaron Conole20f79562015-11-24 13:51:53 -0500259 * Detaches @vport from its datapath and destroys it. ovs_mutex must
260 * be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700261 */
262void ovs_vport_del(struct vport *vport)
263{
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700264 ASSERT_OVSL();
Jesse Grossccb13522011-10-25 19:26:31 -0700265
266 hlist_del_rcu(&vport->hash_node);
Thomas Graf62b9c8d2014-10-22 17:29:06 +0200267 module_put(vport->ops->owner);
Thomas Graffa2d8ff2015-03-30 13:57:41 +0200268 vport->ops->destroy(vport);
Jesse Grossccb13522011-10-25 19:26:31 -0700269}
270
271/**
272 * ovs_vport_get_stats - retrieve device stats
273 *
274 * @vport: vport from which to retrieve the stats
275 * @stats: location to store stats
276 *
277 * Retrieves transmit, receive, and error stats for the given device.
278 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700279 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700280 */
281void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
282{
Pravin B Shelar83ffe992015-10-02 14:56:34 -0700283 const struct rtnl_link_stats64 *dev_stats;
284 struct rtnl_link_stats64 temp;
Jesse Grossccb13522011-10-25 19:26:31 -0700285
Pravin B Shelar83ffe992015-10-02 14:56:34 -0700286 dev_stats = dev_get_stats(vport->dev, &temp);
287 stats->rx_errors = dev_stats->rx_errors;
288 stats->tx_errors = dev_stats->tx_errors;
289 stats->tx_dropped = dev_stats->tx_dropped;
290 stats->rx_dropped = dev_stats->rx_dropped;
Jesse Grossccb13522011-10-25 19:26:31 -0700291
Pravin B Shelar83ffe992015-10-02 14:56:34 -0700292 stats->rx_bytes = dev_stats->rx_bytes;
293 stats->rx_packets = dev_stats->rx_packets;
294 stats->tx_bytes = dev_stats->tx_bytes;
295 stats->tx_packets = dev_stats->tx_packets;
Jesse Grossccb13522011-10-25 19:26:31 -0700296}
297
298/**
299 * ovs_vport_get_options - retrieve device options
300 *
301 * @vport: vport from which to retrieve the options.
302 * @skb: sk_buff where options should be appended.
303 *
304 * Retrieves the configuration of the given device, appending an
305 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
306 * vport-specific attributes to @skb.
307 *
308 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
309 * negative error code if a real error occurred. If an error occurs, @skb is
310 * left unmodified.
311 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700312 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700313 */
314int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
315{
316 struct nlattr *nla;
Thomas Graf5d963352013-04-03 00:30:43 +0200317 int err;
318
319 if (!vport->ops->get_options)
320 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700321
322 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
323 if (!nla)
324 return -EMSGSIZE;
325
Thomas Graf5d963352013-04-03 00:30:43 +0200326 err = vport->ops->get_options(vport, skb);
327 if (err) {
328 nla_nest_cancel(skb, nla);
329 return err;
Jesse Grossccb13522011-10-25 19:26:31 -0700330 }
331
332 nla_nest_end(skb, nla);
333 return 0;
334}
335
336/**
Alex Wang5cd667b2014-07-17 15:14:13 -0700337 * ovs_vport_set_upcall_portids - set upcall portids of @vport.
338 *
339 * @vport: vport to modify.
340 * @ids: new configuration, an array of port ids.
341 *
342 * Sets the vport's upcall_portids to @ids.
343 *
344 * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
345 * as an array of U32.
346 *
347 * Must be called with ovs_mutex.
348 */
Thomas Graf12eb18f2014-11-06 06:58:52 -0800349int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
Alex Wang5cd667b2014-07-17 15:14:13 -0700350{
351 struct vport_portids *old, *vport_portids;
352
353 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
354 return -EINVAL;
355
356 old = ovsl_dereference(vport->upcall_portids);
357
358 vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),
359 GFP_KERNEL);
360 if (!vport_portids)
361 return -ENOMEM;
362
363 vport_portids->n_ids = nla_len(ids) / sizeof(u32);
364 vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
365 nla_memcpy(vport_portids->ids, ids, nla_len(ids));
366
367 rcu_assign_pointer(vport->upcall_portids, vport_portids);
368
369 if (old)
370 kfree_rcu(old, rcu);
371 return 0;
372}
373
374/**
375 * ovs_vport_get_upcall_portids - get the upcall_portids of @vport.
376 *
377 * @vport: vport from which to retrieve the portids.
378 * @skb: sk_buff where portids should be appended.
379 *
380 * Retrieves the configuration of the given vport, appending the
381 * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall
382 * portids to @skb.
383 *
384 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room.
385 * If an error occurs, @skb is left unmodified. Must be called with
386 * ovs_mutex or rcu_read_lock.
387 */
388int ovs_vport_get_upcall_portids(const struct vport *vport,
389 struct sk_buff *skb)
390{
391 struct vport_portids *ids;
392
393 ids = rcu_dereference_ovsl(vport->upcall_portids);
394
395 if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS)
396 return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID,
397 ids->n_ids * sizeof(u32), (void *)ids->ids);
398 else
399 return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]);
400}
401
402/**
403 * ovs_vport_find_upcall_portid - find the upcall portid to send upcall.
404 *
405 * @vport: vport from which the missed packet is received.
406 * @skb: skb that the missed packet was received.
407 *
408 * Uses the skb_get_hash() to select the upcall portid to send the
409 * upcall.
410 *
411 * Returns the portid of the target socket. Must be called with rcu_read_lock.
412 */
Fabian Frederick4e8febd2014-10-15 21:03:41 +0200413u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb)
Alex Wang5cd667b2014-07-17 15:14:13 -0700414{
415 struct vport_portids *ids;
416 u32 ids_index;
417 u32 hash;
418
Fabian Frederick4e8febd2014-10-15 21:03:41 +0200419 ids = rcu_dereference(vport->upcall_portids);
Alex Wang5cd667b2014-07-17 15:14:13 -0700420
421 if (ids->n_ids == 1 && ids->ids[0] == 0)
422 return 0;
423
424 hash = skb_get_hash(skb);
425 ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids);
426 return ids->ids[ids_index];
427}
428
429/**
Jesse Grossccb13522011-10-25 19:26:31 -0700430 * ovs_vport_receive - pass up received packet to the datapath for processing
431 *
432 * @vport: vport that received the packet
433 * @skb: skb that was received
Justin Pettit26948382013-08-19 17:49:29 -0700434 * @tun_key: tunnel (if any) that carried packet
Jesse Grossccb13522011-10-25 19:26:31 -0700435 *
436 * Must be called with rcu_read_lock. The packet cannot be shared and
Cong Wangd176ca22013-02-22 19:41:26 +0800437 * skb->data should point to the Ethernet header.
Jesse Grossccb13522011-10-25 19:26:31 -0700438 */
Pravin B Shelar8c876632015-08-29 17:44:07 -0700439int ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
440 const struct ip_tunnel_info *tun_info)
Jesse Grossccb13522011-10-25 19:26:31 -0700441{
Pravin B Shelar8c8b1b82014-09-15 19:28:44 -0700442 struct sw_flow_key key;
443 int error;
Jesse Grossccb13522011-10-25 19:26:31 -0700444
Pravin B Shelar83c8df22014-09-15 19:20:31 -0700445 OVS_CB(skb)->input_vport = vport;
Joe Stringer7f8a4362015-08-26 11:31:48 -0700446 OVS_CB(skb)->mru = 0;
William Tuf2a4d082016-06-10 11:49:33 -0700447 OVS_CB(skb)->cutlen = 0;
Joe Stringer740dbc22015-10-16 11:08:18 -0700448 if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) {
449 u32 mark;
450
451 mark = skb->mark;
452 skb_scrub_packet(skb, true);
453 skb->mark = mark;
454 tun_info = NULL;
455 }
456
Pravin B Shelar8c8b1b82014-09-15 19:28:44 -0700457 /* Extract flow from 'skb' into 'key'. */
Jesse Grossf0b128c2014-10-03 15:35:31 -0700458 error = ovs_flow_key_extract(tun_info, skb, &key);
Pravin B Shelar8c8b1b82014-09-15 19:28:44 -0700459 if (unlikely(error)) {
460 kfree_skb(skb);
Pravin B Shelar8c876632015-08-29 17:44:07 -0700461 return error;
Pravin B Shelar8c8b1b82014-09-15 19:28:44 -0700462 }
463 ovs_dp_process_packet(skb, &key);
Pravin B Shelar8c876632015-08-29 17:44:07 -0700464 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700465}
Pravin B Shelar9ba559d2014-11-06 06:44:27 -0800466EXPORT_SYMBOL_GPL(ovs_vport_receive);
Jesse Grossccb13522011-10-25 19:26:31 -0700467
Pravin B Shelaraa310702013-06-17 17:50:33 -0700468static void free_vport_rcu(struct rcu_head *rcu)
469{
470 struct vport *vport = container_of(rcu, struct vport, rcu);
471
472 ovs_vport_free(vport);
473}
474
475void ovs_vport_deferred_free(struct vport *vport)
476{
477 if (!vport)
478 return;
479
480 call_rcu(&vport->rcu, free_vport_rcu);
481}
Pravin B Shelar9ba559d2014-11-06 06:44:27 -0800482EXPORT_SYMBOL_GPL(ovs_vport_deferred_free);
Wenyu Zhang8f0aad62014-11-06 06:51:24 -0800483
Pravin B Shelaraec15922015-10-20 23:00:10 -0700484static unsigned int packet_length(const struct sk_buff *skb)
485{
486 unsigned int length = skb->len - ETH_HLEN;
487
488 if (skb->protocol == htons(ETH_P_8021Q))
489 length -= VLAN_HLEN;
490
491 return length;
492}
493
494void ovs_vport_send(struct vport *vport, struct sk_buff *skb)
495{
496 int mtu = vport->dev->mtu;
497
498 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
499 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
500 vport->dev->name,
501 packet_length(skb), mtu);
502 vport->dev->stats.tx_errors++;
503 goto drop;
504 }
505
506 skb->dev = vport->dev;
507 vport->ops->send(skb);
508 return;
509
510drop:
511 kfree_skb(skb);
512}