Commit | Line | Data |
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ccb1352e | 1 | /* |
caf2ee14 | 2 | * Copyright (c) 2007-2012 Nicira, Inc. |
ccb1352e JG |
3 | * |
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 | ||
ccb1352e JG |
19 | #include <linux/etherdevice.h> |
20 | #include <linux/if.h> | |
21 | #include <linux/if_vlan.h> | |
46df7b81 | 22 | #include <linux/jhash.h> |
ccb1352e JG |
23 | #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> | |
46df7b81 | 30 | #include <net/net_namespace.h> |
ccb1352e | 31 | |
46df7b81 | 32 | #include "datapath.h" |
ccb1352e JG |
33 | #include "vport.h" |
34 | #include "vport-internal_dev.h" | |
35 | ||
443cd88c SH |
36 | static void ovs_vport_record_error(struct vport *, |
37 | enum vport_err_type err_type); | |
38 | ||
ccb1352e JG |
39 | /* List of statically compiled vport implementations. Don't forget to also |
40 | * add yours to the list at the bottom of vport.h. */ | |
41 | static const struct vport_ops *vport_ops_list[] = { | |
42 | &ovs_netdev_vport_ops, | |
43 | &ovs_internal_vport_ops, | |
aa310701 | 44 | |
fb825a55 | 45 | #ifdef CONFIG_OPENVSWITCH_GRE |
aa310701 PS |
46 | &ovs_gre_vport_ops, |
47 | #endif | |
58264848 PS |
48 | #ifdef CONFIG_OPENVSWITCH_VXLAN |
49 | &ovs_vxlan_vport_ops, | |
50 | #endif | |
ccb1352e JG |
51 | }; |
52 | ||
8e4e1713 | 53 | /* Protected by RCU read lock for reading, ovs_mutex for writing. */ |
ccb1352e JG |
54 | static 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 | */ | |
62 | int 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 | */ | |
77 | void ovs_vport_exit(void) | |
78 | { | |
79 | kfree(dev_table); | |
80 | } | |
81 | ||
46df7b81 | 82 | static struct hlist_head *hash_bucket(struct net *net, const char *name) |
ccb1352e | 83 | { |
46df7b81 | 84 | unsigned int hash = jhash(name, strlen(name), (unsigned long) net); |
ccb1352e JG |
85 | 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 | * | |
8e4e1713 | 93 | * Must be called with ovs or RCU read lock. |
ccb1352e | 94 | */ |
46df7b81 | 95 | struct vport *ovs_vport_locate(struct net *net, const char *name) |
ccb1352e | 96 | { |
46df7b81 | 97 | struct hlist_head *bucket = hash_bucket(net, name); |
ccb1352e | 98 | struct vport *vport; |
ccb1352e | 99 | |
b67bfe0d | 100 | hlist_for_each_entry_rcu(vport, bucket, hash_node) |
46df7b81 PS |
101 | if (!strcmp(name, vport->ops->get_name(vport)) && |
102 | net_eq(ovs_dp_get_net(vport->dp), net)) | |
ccb1352e JG |
103 | 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 | */ | |
119 | struct 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; | |
15e47304 | 137 | vport->upcall_portid = parms->upcall_portid; |
ccb1352e | 138 | vport->ops = ops; |
15eac2a7 | 139 | INIT_HLIST_NODE(&vport->dp_hash_node); |
ccb1352e | 140 | |
1c213bd2 | 141 | vport->percpu_stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
f0a98ae8 DC |
142 | if (!vport->percpu_stats) { |
143 | kfree(vport); | |
ccb1352e | 144 | return ERR_PTR(-ENOMEM); |
f0a98ae8 | 145 | } |
ccb1352e JG |
146 | |
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 | */ | |
162 | void 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 | |
8e4e1713 | 174 | * device type). ovs_mutex must be held. |
ccb1352e JG |
175 | */ |
176 | struct vport *ovs_vport_add(const struct vport_parms *parms) | |
177 | { | |
178 | struct vport *vport; | |
179 | int err = 0; | |
180 | int i; | |
181 | ||
ccb1352e JG |
182 | for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) { |
183 | if (vport_ops_list[i]->type == parms->type) { | |
46df7b81 PS |
184 | struct hlist_head *bucket; |
185 | ||
ccb1352e JG |
186 | vport = vport_ops_list[i]->create(parms); |
187 | if (IS_ERR(vport)) { | |
188 | err = PTR_ERR(vport); | |
189 | goto out; | |
190 | } | |
191 | ||
46df7b81 PS |
192 | bucket = hash_bucket(ovs_dp_get_net(vport->dp), |
193 | vport->ops->get_name(vport)); | |
194 | hlist_add_head_rcu(&vport->hash_node, bucket); | |
ccb1352e JG |
195 | return vport; |
196 | } | |
197 | } | |
198 | ||
199 | err = -EAFNOSUPPORT; | |
200 | ||
201 | out: | |
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. | |
2694838d | 209 | * @options: New configuration. |
ccb1352e JG |
210 | * |
211 | * Modifies an existing device with the specified configuration (which is | |
8e4e1713 | 212 | * dependent on device type). ovs_mutex must be held. |
ccb1352e JG |
213 | */ |
214 | int ovs_vport_set_options(struct vport *vport, struct nlattr *options) | |
215 | { | |
ccb1352e JG |
216 | 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 | |
8e4e1713 | 227 | * for reasons such as lack of memory. ovs_mutex must be held. |
ccb1352e JG |
228 | */ |
229 | void ovs_vport_del(struct vport *vport) | |
230 | { | |
8e4e1713 | 231 | ASSERT_OVSL(); |
ccb1352e JG |
232 | |
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 | * | |
8e4e1713 | 246 | * Must be called with ovs_mutex or rcu_read_lock. |
ccb1352e JG |
247 | */ |
248 | void 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) { | |
8f84985f LR |
273 | const struct pcpu_sw_netstats *percpu_stats; |
274 | struct pcpu_sw_netstats local_stats; | |
ccb1352e JG |
275 | unsigned int start; |
276 | ||
277 | percpu_stats = per_cpu_ptr(vport->percpu_stats, i); | |
278 | ||
279 | do { | |
e0f0ecf3 | 280 | start = u64_stats_fetch_begin_bh(&percpu_stats->syncp); |
ccb1352e | 281 | local_stats = *percpu_stats; |
e0f0ecf3 | 282 | } while (u64_stats_fetch_retry_bh(&percpu_stats->syncp, start)); |
ccb1352e JG |
283 | |
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 | * | |
8e4e1713 | 305 | * Must be called with ovs_mutex or rcu_read_lock. |
ccb1352e JG |
306 | */ |
307 | int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb) | |
308 | { | |
309 | struct nlattr *nla; | |
5d963352 TG |
310 | int err; |
311 | ||
312 | if (!vport->ops->get_options) | |
313 | return 0; | |
ccb1352e JG |
314 | |
315 | nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS); | |
316 | if (!nla) | |
317 | return -EMSGSIZE; | |
318 | ||
5d963352 TG |
319 | err = vport->ops->get_options(vport, skb); |
320 | if (err) { | |
321 | nla_nest_cancel(skb, nla); | |
322 | return err; | |
ccb1352e JG |
323 | } |
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 | |
2694838d | 334 | * @tun_key: tunnel (if any) that carried packet |
ccb1352e JG |
335 | * |
336 | * Must be called with rcu_read_lock. The packet cannot be shared and | |
d176ca2a | 337 | * skb->data should point to the Ethernet header. |
ccb1352e | 338 | */ |
7d5437c7 PS |
339 | void ovs_vport_receive(struct vport *vport, struct sk_buff *skb, |
340 | struct ovs_key_ipv4_tunnel *tun_key) | |
ccb1352e | 341 | { |
8f84985f | 342 | struct pcpu_sw_netstats *stats; |
ccb1352e | 343 | |
404f2f10 | 344 | stats = this_cpu_ptr(vport->percpu_stats); |
e0f0ecf3 | 345 | u64_stats_update_begin(&stats->syncp); |
ccb1352e JG |
346 | stats->rx_packets++; |
347 | stats->rx_bytes += skb->len; | |
e0f0ecf3 | 348 | u64_stats_update_end(&stats->syncp); |
ccb1352e | 349 | |
7d5437c7 | 350 | OVS_CB(skb)->tun_key = tun_key; |
ccb1352e JG |
351 | 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 | * | |
8e4e1713 | 360 | * Sends the given packet and returns the length of data sent. Either ovs |
ccb1352e JG |
361 | * lock or rcu_read_lock must be held. |
362 | */ | |
363 | int ovs_vport_send(struct vport *vport, struct sk_buff *skb) | |
364 | { | |
365 | int sent = vport->ops->send(vport, skb); | |
366 | ||
91b7514c | 367 | if (likely(sent > 0)) { |
8f84985f | 368 | struct pcpu_sw_netstats *stats; |
ccb1352e | 369 | |
404f2f10 | 370 | stats = this_cpu_ptr(vport->percpu_stats); |
ccb1352e | 371 | |
e0f0ecf3 | 372 | u64_stats_update_begin(&stats->syncp); |
ccb1352e JG |
373 | stats->tx_packets++; |
374 | stats->tx_bytes += sent; | |
e0f0ecf3 | 375 | u64_stats_update_end(&stats->syncp); |
91b7514c PS |
376 | } 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 | ||
ccb1352e JG |
382 | 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 | |
af784163 | 392 | * type has occurred. |
ccb1352e | 393 | */ |
443cd88c SH |
394 | static void ovs_vport_record_error(struct vport *vport, |
395 | enum vport_err_type err_type) | |
ccb1352e JG |
396 | { |
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; | |
a2bf91b5 | 415 | } |
ccb1352e JG |
416 | |
417 | spin_unlock(&vport->stats_lock); | |
418 | } | |
aa310701 PS |
419 | |
420 | static 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 | ||
427 | void ovs_vport_deferred_free(struct vport *vport) | |
428 | { | |
429 | if (!vport) | |
430 | return; | |
431 | ||
432 | call_rcu(&vport->rcu, free_vport_rcu); | |
433 | } |