blob: 208dd9a26dd16d003a0f49d4288f8704cbe15c8e [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;
John Stultz827da442013-10-07 15:51:58 -0700124 int i;
Jesse Grossccb13522011-10-25 19:26:31 -0700125
126 alloc_size = sizeof(struct vport);
127 if (priv_size) {
128 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
129 alloc_size += priv_size;
130 }
131
132 vport = kzalloc(alloc_size, GFP_KERNEL);
133 if (!vport)
134 return ERR_PTR(-ENOMEM);
135
136 vport->dp = parms->dp;
137 vport->port_no = parms->port_no;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000138 vport->upcall_portid = parms->upcall_portid;
Jesse Grossccb13522011-10-25 19:26:31 -0700139 vport->ops = ops;
Pravin B Shelar15eac2a2012-08-23 12:40:54 -0700140 INIT_HLIST_NODE(&vport->dp_hash_node);
Jesse Grossccb13522011-10-25 19:26:31 -0700141
Li RongQing8f849852014-01-04 13:57:59 +0800142 vport->percpu_stats = alloc_percpu(struct pcpu_sw_netstats);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000143 if (!vport->percpu_stats) {
144 kfree(vport);
Jesse Grossccb13522011-10-25 19:26:31 -0700145 return ERR_PTR(-ENOMEM);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000146 }
Jesse Grossccb13522011-10-25 19:26:31 -0700147
John Stultz827da442013-10-07 15:51:58 -0700148 for_each_possible_cpu(i) {
Li RongQing8f849852014-01-04 13:57:59 +0800149 struct pcpu_sw_netstats *vport_stats;
John Stultz827da442013-10-07 15:51:58 -0700150 vport_stats = per_cpu_ptr(vport->percpu_stats, i);
151 u64_stats_init(&vport_stats->syncp);
152 }
153
154
Jesse Grossccb13522011-10-25 19:26:31 -0700155 spin_lock_init(&vport->stats_lock);
156
157 return vport;
158}
159
160/**
161 * ovs_vport_free - uninitialize and free vport
162 *
163 * @vport: vport to free
164 *
165 * Frees a vport allocated with vport_alloc() when it is no longer needed.
166 *
167 * The caller must ensure that an RCU grace period has passed since the last
168 * time @vport was in a datapath.
169 */
170void ovs_vport_free(struct vport *vport)
171{
172 free_percpu(vport->percpu_stats);
173 kfree(vport);
174}
175
176/**
177 * ovs_vport_add - add vport device (for kernel callers)
178 *
179 * @parms: Information about new vport.
180 *
181 * Creates a new vport with the specified configuration (which is dependent on
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700182 * device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700183 */
184struct vport *ovs_vport_add(const struct vport_parms *parms)
185{
186 struct vport *vport;
187 int err = 0;
188 int i;
189
Jesse Grossccb13522011-10-25 19:26:31 -0700190 for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
191 if (vport_ops_list[i]->type == parms->type) {
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800192 struct hlist_head *bucket;
193
Jesse Grossccb13522011-10-25 19:26:31 -0700194 vport = vport_ops_list[i]->create(parms);
195 if (IS_ERR(vport)) {
196 err = PTR_ERR(vport);
197 goto out;
198 }
199
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800200 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
201 vport->ops->get_name(vport));
202 hlist_add_head_rcu(&vport->hash_node, bucket);
Jesse Grossccb13522011-10-25 19:26:31 -0700203 return vport;
204 }
205 }
206
207 err = -EAFNOSUPPORT;
208
209out:
210 return ERR_PTR(err);
211}
212
213/**
214 * ovs_vport_set_options - modify existing vport device (for kernel callers)
215 *
216 * @vport: vport to modify.
Justin Pettit26948382013-08-19 17:49:29 -0700217 * @options: New configuration.
Jesse Grossccb13522011-10-25 19:26:31 -0700218 *
219 * Modifies an existing device with the specified configuration (which is
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700220 * dependent on device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700221 */
222int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
223{
Jesse Grossccb13522011-10-25 19:26:31 -0700224 if (!vport->ops->set_options)
225 return -EOPNOTSUPP;
226 return vport->ops->set_options(vport, options);
227}
228
229/**
230 * ovs_vport_del - delete existing vport device
231 *
232 * @vport: vport to delete.
233 *
234 * Detaches @vport from its datapath and destroys it. It is possible to fail
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700235 * for reasons such as lack of memory. ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700236 */
237void ovs_vport_del(struct vport *vport)
238{
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700239 ASSERT_OVSL();
Jesse Grossccb13522011-10-25 19:26:31 -0700240
241 hlist_del_rcu(&vport->hash_node);
242
243 vport->ops->destroy(vport);
244}
245
246/**
247 * ovs_vport_get_stats - retrieve device stats
248 *
249 * @vport: vport from which to retrieve the stats
250 * @stats: location to store stats
251 *
252 * Retrieves transmit, receive, and error stats for the given device.
253 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700254 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700255 */
256void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
257{
258 int i;
259
260 memset(stats, 0, sizeof(*stats));
261
262 /* We potentially have 2 sources of stats that need to be combined:
263 * those we have collected (split into err_stats and percpu_stats) from
264 * set_stats() and device error stats from netdev->get_stats() (for
265 * errors that happen downstream and therefore aren't reported through
266 * our vport_record_error() function).
267 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
268 * netdev-stats can be directly read over netlink-ioctl.
269 */
270
271 spin_lock_bh(&vport->stats_lock);
272
273 stats->rx_errors = vport->err_stats.rx_errors;
274 stats->tx_errors = vport->err_stats.tx_errors;
275 stats->tx_dropped = vport->err_stats.tx_dropped;
276 stats->rx_dropped = vport->err_stats.rx_dropped;
277
278 spin_unlock_bh(&vport->stats_lock);
279
280 for_each_possible_cpu(i) {
Li RongQing8f849852014-01-04 13:57:59 +0800281 const struct pcpu_sw_netstats *percpu_stats;
282 struct pcpu_sw_netstats local_stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700283 unsigned int start;
284
285 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
286
287 do {
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700288 start = u64_stats_fetch_begin_bh(&percpu_stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700289 local_stats = *percpu_stats;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700290 } while (u64_stats_fetch_retry_bh(&percpu_stats->syncp, start));
Jesse Grossccb13522011-10-25 19:26:31 -0700291
292 stats->rx_bytes += local_stats.rx_bytes;
293 stats->rx_packets += local_stats.rx_packets;
294 stats->tx_bytes += local_stats.tx_bytes;
295 stats->tx_packets += local_stats.tx_packets;
296 }
297}
298
299/**
300 * ovs_vport_get_options - retrieve device options
301 *
302 * @vport: vport from which to retrieve the options.
303 * @skb: sk_buff where options should be appended.
304 *
305 * Retrieves the configuration of the given device, appending an
306 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
307 * vport-specific attributes to @skb.
308 *
309 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
310 * negative error code if a real error occurred. If an error occurs, @skb is
311 * left unmodified.
312 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700313 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700314 */
315int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
316{
317 struct nlattr *nla;
Thomas Graf5d963352013-04-03 00:30:43 +0200318 int err;
319
320 if (!vport->ops->get_options)
321 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700322
323 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
324 if (!nla)
325 return -EMSGSIZE;
326
Thomas Graf5d963352013-04-03 00:30:43 +0200327 err = vport->ops->get_options(vport, skb);
328 if (err) {
329 nla_nest_cancel(skb, nla);
330 return err;
Jesse Grossccb13522011-10-25 19:26:31 -0700331 }
332
333 nla_nest_end(skb, nla);
334 return 0;
335}
336
337/**
338 * ovs_vport_receive - pass up received packet to the datapath for processing
339 *
340 * @vport: vport that received the packet
341 * @skb: skb that was received
Justin Pettit26948382013-08-19 17:49:29 -0700342 * @tun_key: tunnel (if any) that carried packet
Jesse Grossccb13522011-10-25 19:26:31 -0700343 *
344 * Must be called with rcu_read_lock. The packet cannot be shared and
Cong Wangd176ca22013-02-22 19:41:26 +0800345 * skb->data should point to the Ethernet header.
Jesse Grossccb13522011-10-25 19:26:31 -0700346 */
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700347void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
348 struct ovs_key_ipv4_tunnel *tun_key)
Jesse Grossccb13522011-10-25 19:26:31 -0700349{
Li RongQing8f849852014-01-04 13:57:59 +0800350 struct pcpu_sw_netstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700351
Shan Wei404f2f12012-11-13 09:52:25 +0800352 stats = this_cpu_ptr(vport->percpu_stats);
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700353 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700354 stats->rx_packets++;
355 stats->rx_bytes += skb->len;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700356 u64_stats_update_end(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700357
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700358 OVS_CB(skb)->tun_key = tun_key;
Jesse Grossccb13522011-10-25 19:26:31 -0700359 ovs_dp_process_received_packet(vport, skb);
360}
361
362/**
363 * ovs_vport_send - send a packet on a device
364 *
365 * @vport: vport on which to send the packet
366 * @skb: skb to send
367 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700368 * Sends the given packet and returns the length of data sent. Either ovs
Jesse Grossccb13522011-10-25 19:26:31 -0700369 * lock or rcu_read_lock must be held.
370 */
371int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
372{
373 int sent = vport->ops->send(vport, skb);
374
Pravin B Shelar91b75142013-05-13 08:22:34 -0700375 if (likely(sent > 0)) {
Li RongQing8f849852014-01-04 13:57:59 +0800376 struct pcpu_sw_netstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700377
Shan Wei404f2f12012-11-13 09:52:25 +0800378 stats = this_cpu_ptr(vport->percpu_stats);
Jesse Grossccb13522011-10-25 19:26:31 -0700379
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700380 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700381 stats->tx_packets++;
382 stats->tx_bytes += sent;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700383 u64_stats_update_end(&stats->syncp);
Pravin B Shelar91b75142013-05-13 08:22:34 -0700384 } else if (sent < 0) {
385 ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
386 kfree_skb(skb);
387 } else
388 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
389
Jesse Grossccb13522011-10-25 19:26:31 -0700390 return sent;
391}
392
393/**
394 * ovs_vport_record_error - indicate device error to generic stats layer
395 *
396 * @vport: vport that encountered the error
397 * @err_type: one of enum vport_err_type types to indicate the error type
398 *
399 * If using the vport generic stats layer indicate that an error of the given
Andy Hillaf784162013-06-07 16:53:50 -0700400 * type has occurred.
Jesse Grossccb13522011-10-25 19:26:31 -0700401 */
Stephen Hemminger443cd882013-12-17 19:22:48 +0000402static void ovs_vport_record_error(struct vport *vport,
403 enum vport_err_type err_type)
Jesse Grossccb13522011-10-25 19:26:31 -0700404{
405 spin_lock(&vport->stats_lock);
406
407 switch (err_type) {
408 case VPORT_E_RX_DROPPED:
409 vport->err_stats.rx_dropped++;
410 break;
411
412 case VPORT_E_RX_ERROR:
413 vport->err_stats.rx_errors++;
414 break;
415
416 case VPORT_E_TX_DROPPED:
417 vport->err_stats.tx_dropped++;
418 break;
419
420 case VPORT_E_TX_ERROR:
421 vport->err_stats.tx_errors++;
422 break;
Peter Senna Tschudina2bf91b2012-09-18 07:10:44 +0000423 }
Jesse Grossccb13522011-10-25 19:26:31 -0700424
425 spin_unlock(&vport->stats_lock);
426}
Pravin B Shelaraa310702013-06-17 17:50:33 -0700427
428static void free_vport_rcu(struct rcu_head *rcu)
429{
430 struct vport *vport = container_of(rcu, struct vport, rcu);
431
432 ovs_vport_free(vport);
433}
434
435void ovs_vport_deferred_free(struct vport *vport)
436{
437 if (!vport)
438 return;
439
440 call_rcu(&vport->rcu, free_vport_rcu);
441}