blob: 42c0f4a0b78c4c3033ab77d12c376590c228459d [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;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000137 vport->upcall_portid = parms->upcall_portid;
Jesse Grossccb13522011-10-25 19:26:31 -0700138 vport->ops = ops;
Pravin B Shelar15eac2a2012-08-23 12:40:54 -0700139 INIT_HLIST_NODE(&vport->dp_hash_node);
Jesse Grossccb13522011-10-25 19:26:31 -0700140
WANG Cong1c213bd2014-02-13 11:46:28 -0800141 vport->percpu_stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000142 if (!vport->percpu_stats) {
143 kfree(vport);
Jesse Grossccb13522011-10-25 19:26:31 -0700144 return ERR_PTR(-ENOMEM);
Dan Carpenterf0a98ae2011-12-05 20:27:07 +0000145 }
Jesse Grossccb13522011-10-25 19:26:31 -0700146
147 spin_lock_init(&vport->stats_lock);
148
149 return vport;
150}
151
152/**
153 * ovs_vport_free - uninitialize and free vport
154 *
155 * @vport: vport to free
156 *
157 * Frees a vport allocated with vport_alloc() when it is no longer needed.
158 *
159 * The caller must ensure that an RCU grace period has passed since the last
160 * time @vport was in a datapath.
161 */
162void ovs_vport_free(struct vport *vport)
163{
164 free_percpu(vport->percpu_stats);
165 kfree(vport);
166}
167
168/**
169 * ovs_vport_add - add vport device (for kernel callers)
170 *
171 * @parms: Information about new vport.
172 *
173 * Creates a new vport with the specified configuration (which is dependent on
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700174 * device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700175 */
176struct vport *ovs_vport_add(const struct vport_parms *parms)
177{
178 struct vport *vport;
179 int err = 0;
180 int i;
181
Jesse Grossccb13522011-10-25 19:26:31 -0700182 for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
183 if (vport_ops_list[i]->type == parms->type) {
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800184 struct hlist_head *bucket;
185
Jesse Grossccb13522011-10-25 19:26:31 -0700186 vport = vport_ops_list[i]->create(parms);
187 if (IS_ERR(vport)) {
188 err = PTR_ERR(vport);
189 goto out;
190 }
191
Pravin B Shelar46df7b82012-02-22 19:58:59 -0800192 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
193 vport->ops->get_name(vport));
194 hlist_add_head_rcu(&vport->hash_node, bucket);
Jesse Grossccb13522011-10-25 19:26:31 -0700195 return vport;
196 }
197 }
198
199 err = -EAFNOSUPPORT;
200
201out:
202 return ERR_PTR(err);
203}
204
205/**
206 * ovs_vport_set_options - modify existing vport device (for kernel callers)
207 *
208 * @vport: vport to modify.
Justin Pettit26948382013-08-19 17:49:29 -0700209 * @options: New configuration.
Jesse Grossccb13522011-10-25 19:26:31 -0700210 *
211 * Modifies an existing device with the specified configuration (which is
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700212 * dependent on device type). ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700213 */
214int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
215{
Jesse Grossccb13522011-10-25 19:26:31 -0700216 if (!vport->ops->set_options)
217 return -EOPNOTSUPP;
218 return vport->ops->set_options(vport, options);
219}
220
221/**
222 * ovs_vport_del - delete existing vport device
223 *
224 * @vport: vport to delete.
225 *
226 * Detaches @vport from its datapath and destroys it. It is possible to fail
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700227 * for reasons such as lack of memory. ovs_mutex must be held.
Jesse Grossccb13522011-10-25 19:26:31 -0700228 */
229void ovs_vport_del(struct vport *vport)
230{
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700231 ASSERT_OVSL();
Jesse Grossccb13522011-10-25 19:26:31 -0700232
233 hlist_del_rcu(&vport->hash_node);
234
235 vport->ops->destroy(vport);
236}
237
238/**
239 * ovs_vport_get_stats - retrieve device stats
240 *
241 * @vport: vport from which to retrieve the stats
242 * @stats: location to store stats
243 *
244 * Retrieves transmit, receive, and error stats for the given device.
245 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700246 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700247 */
248void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
249{
250 int i;
251
252 memset(stats, 0, sizeof(*stats));
253
254 /* We potentially have 2 sources of stats that need to be combined:
255 * those we have collected (split into err_stats and percpu_stats) from
256 * set_stats() and device error stats from netdev->get_stats() (for
257 * errors that happen downstream and therefore aren't reported through
258 * our vport_record_error() function).
259 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
260 * netdev-stats can be directly read over netlink-ioctl.
261 */
262
263 spin_lock_bh(&vport->stats_lock);
264
265 stats->rx_errors = vport->err_stats.rx_errors;
266 stats->tx_errors = vport->err_stats.tx_errors;
267 stats->tx_dropped = vport->err_stats.tx_dropped;
268 stats->rx_dropped = vport->err_stats.rx_dropped;
269
270 spin_unlock_bh(&vport->stats_lock);
271
272 for_each_possible_cpu(i) {
Li RongQing8f849852014-01-04 13:57:59 +0800273 const struct pcpu_sw_netstats *percpu_stats;
274 struct pcpu_sw_netstats local_stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700275 unsigned int start;
276
277 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
278
279 do {
Eric W. Biederman57a77442014-03-13 21:26:42 -0700280 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700281 local_stats = *percpu_stats;
Eric W. Biederman57a77442014-03-13 21:26:42 -0700282 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
Jesse Grossccb13522011-10-25 19:26:31 -0700283
284 stats->rx_bytes += local_stats.rx_bytes;
285 stats->rx_packets += local_stats.rx_packets;
286 stats->tx_bytes += local_stats.tx_bytes;
287 stats->tx_packets += local_stats.tx_packets;
288 }
289}
290
291/**
292 * ovs_vport_get_options - retrieve device options
293 *
294 * @vport: vport from which to retrieve the options.
295 * @skb: sk_buff where options should be appended.
296 *
297 * Retrieves the configuration of the given device, appending an
298 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
299 * vport-specific attributes to @skb.
300 *
301 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
302 * negative error code if a real error occurred. If an error occurs, @skb is
303 * left unmodified.
304 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700305 * Must be called with ovs_mutex or rcu_read_lock.
Jesse Grossccb13522011-10-25 19:26:31 -0700306 */
307int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
308{
309 struct nlattr *nla;
Thomas Graf5d963352013-04-03 00:30:43 +0200310 int err;
311
312 if (!vport->ops->get_options)
313 return 0;
Jesse Grossccb13522011-10-25 19:26:31 -0700314
315 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
316 if (!nla)
317 return -EMSGSIZE;
318
Thomas Graf5d963352013-04-03 00:30:43 +0200319 err = vport->ops->get_options(vport, skb);
320 if (err) {
321 nla_nest_cancel(skb, nla);
322 return err;
Jesse Grossccb13522011-10-25 19:26:31 -0700323 }
324
325 nla_nest_end(skb, nla);
326 return 0;
327}
328
329/**
330 * ovs_vport_receive - pass up received packet to the datapath for processing
331 *
332 * @vport: vport that received the packet
333 * @skb: skb that was received
Justin Pettit26948382013-08-19 17:49:29 -0700334 * @tun_key: tunnel (if any) that carried packet
Jesse Grossccb13522011-10-25 19:26:31 -0700335 *
336 * Must be called with rcu_read_lock. The packet cannot be shared and
Cong Wangd176ca22013-02-22 19:41:26 +0800337 * skb->data should point to the Ethernet header.
Jesse Grossccb13522011-10-25 19:26:31 -0700338 */
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700339void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
340 struct ovs_key_ipv4_tunnel *tun_key)
Jesse Grossccb13522011-10-25 19:26:31 -0700341{
Li RongQing8f849852014-01-04 13:57:59 +0800342 struct pcpu_sw_netstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700343
Shan Wei404f2f12012-11-13 09:52:25 +0800344 stats = this_cpu_ptr(vport->percpu_stats);
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700345 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700346 stats->rx_packets++;
347 stats->rx_bytes += skb->len;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700348 u64_stats_update_end(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700349
Pravin B Shelar7d5437c2013-06-17 17:50:18 -0700350 OVS_CB(skb)->tun_key = tun_key;
Jesse Grossccb13522011-10-25 19:26:31 -0700351 ovs_dp_process_received_packet(vport, skb);
352}
353
354/**
355 * ovs_vport_send - send a packet on a device
356 *
357 * @vport: vport on which to send the packet
358 * @skb: skb to send
359 *
Pravin B Shelar8e4e1712013-04-15 13:23:03 -0700360 * Sends the given packet and returns the length of data sent. Either ovs
Jesse Grossccb13522011-10-25 19:26:31 -0700361 * lock or rcu_read_lock must be held.
362 */
363int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
364{
365 int sent = vport->ops->send(vport, skb);
366
Pravin B Shelar91b75142013-05-13 08:22:34 -0700367 if (likely(sent > 0)) {
Li RongQing8f849852014-01-04 13:57:59 +0800368 struct pcpu_sw_netstats *stats;
Jesse Grossccb13522011-10-25 19:26:31 -0700369
Shan Wei404f2f12012-11-13 09:52:25 +0800370 stats = this_cpu_ptr(vport->percpu_stats);
Jesse Grossccb13522011-10-25 19:26:31 -0700371
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700372 u64_stats_update_begin(&stats->syncp);
Jesse Grossccb13522011-10-25 19:26:31 -0700373 stats->tx_packets++;
374 stats->tx_bytes += sent;
Pravin B Shelare0f0ecf2013-04-15 13:30:37 -0700375 u64_stats_update_end(&stats->syncp);
Pravin B Shelar91b75142013-05-13 08:22:34 -0700376 } else if (sent < 0) {
377 ovs_vport_record_error(vport, VPORT_E_TX_ERROR);
378 kfree_skb(skb);
379 } else
380 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
381
Jesse Grossccb13522011-10-25 19:26:31 -0700382 return sent;
383}
384
385/**
386 * ovs_vport_record_error - indicate device error to generic stats layer
387 *
388 * @vport: vport that encountered the error
389 * @err_type: one of enum vport_err_type types to indicate the error type
390 *
391 * If using the vport generic stats layer indicate that an error of the given
Andy Hillaf784162013-06-07 16:53:50 -0700392 * type has occurred.
Jesse Grossccb13522011-10-25 19:26:31 -0700393 */
Stephen Hemminger443cd882013-12-17 19:22:48 +0000394static void ovs_vport_record_error(struct vport *vport,
395 enum vport_err_type err_type)
Jesse Grossccb13522011-10-25 19:26:31 -0700396{
397 spin_lock(&vport->stats_lock);
398
399 switch (err_type) {
400 case VPORT_E_RX_DROPPED:
401 vport->err_stats.rx_dropped++;
402 break;
403
404 case VPORT_E_RX_ERROR:
405 vport->err_stats.rx_errors++;
406 break;
407
408 case VPORT_E_TX_DROPPED:
409 vport->err_stats.tx_dropped++;
410 break;
411
412 case VPORT_E_TX_ERROR:
413 vport->err_stats.tx_errors++;
414 break;
Peter Senna Tschudina2bf91b2012-09-18 07:10:44 +0000415 }
Jesse Grossccb13522011-10-25 19:26:31 -0700416
417 spin_unlock(&vport->stats_lock);
418}
Pravin B Shelaraa310702013-06-17 17:50:33 -0700419
420static void free_vport_rcu(struct rcu_head *rcu)
421{
422 struct vport *vport = container_of(rcu, struct vport, rcu);
423
424 ovs_vport_free(vport);
425}
426
427void ovs_vport_deferred_free(struct vport *vport)
428{
429 if (!vport)
430 return;
431
432 call_rcu(&vport->rcu, free_vport_rcu);
433}