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 | ||
36 | /* List of statically compiled vport implementations. Don't forget to also | |
37 | * add yours to the list at the bottom of vport.h. */ | |
38 | static const struct vport_ops *vport_ops_list[] = { | |
39 | &ovs_netdev_vport_ops, | |
40 | &ovs_internal_vport_ops, | |
aa310701 | 41 | |
fb825a55 | 42 | #ifdef CONFIG_OPENVSWITCH_GRE |
aa310701 PS |
43 | &ovs_gre_vport_ops, |
44 | #endif | |
58264848 PS |
45 | #ifdef CONFIG_OPENVSWITCH_VXLAN |
46 | &ovs_vxlan_vport_ops, | |
47 | #endif | |
ccb1352e JG |
48 | }; |
49 | ||
8e4e1713 | 50 | /* Protected by RCU read lock for reading, ovs_mutex for writing. */ |
ccb1352e JG |
51 | static struct hlist_head *dev_table; |
52 | #define VPORT_HASH_BUCKETS 1024 | |
53 | ||
54 | /** | |
55 | * ovs_vport_init - initialize vport subsystem | |
56 | * | |
57 | * Called at module load time to initialize the vport subsystem. | |
58 | */ | |
59 | int ovs_vport_init(void) | |
60 | { | |
61 | dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head), | |
62 | GFP_KERNEL); | |
63 | if (!dev_table) | |
64 | return -ENOMEM; | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | /** | |
70 | * ovs_vport_exit - shutdown vport subsystem | |
71 | * | |
72 | * Called at module exit time to shutdown the vport subsystem. | |
73 | */ | |
74 | void ovs_vport_exit(void) | |
75 | { | |
76 | kfree(dev_table); | |
77 | } | |
78 | ||
46df7b81 | 79 | static struct hlist_head *hash_bucket(struct net *net, const char *name) |
ccb1352e | 80 | { |
46df7b81 | 81 | unsigned int hash = jhash(name, strlen(name), (unsigned long) net); |
ccb1352e JG |
82 | return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)]; |
83 | } | |
84 | ||
85 | /** | |
86 | * ovs_vport_locate - find a port that has already been created | |
87 | * | |
88 | * @name: name of port to find | |
89 | * | |
8e4e1713 | 90 | * Must be called with ovs or RCU read lock. |
ccb1352e | 91 | */ |
46df7b81 | 92 | struct vport *ovs_vport_locate(struct net *net, const char *name) |
ccb1352e | 93 | { |
46df7b81 | 94 | struct hlist_head *bucket = hash_bucket(net, name); |
ccb1352e | 95 | struct vport *vport; |
ccb1352e | 96 | |
b67bfe0d | 97 | hlist_for_each_entry_rcu(vport, bucket, hash_node) |
46df7b81 PS |
98 | if (!strcmp(name, vport->ops->get_name(vport)) && |
99 | net_eq(ovs_dp_get_net(vport->dp), net)) | |
ccb1352e JG |
100 | return vport; |
101 | ||
102 | return NULL; | |
103 | } | |
104 | ||
105 | /** | |
106 | * ovs_vport_alloc - allocate and initialize new vport | |
107 | * | |
108 | * @priv_size: Size of private data area to allocate. | |
109 | * @ops: vport device ops | |
110 | * | |
111 | * Allocate and initialize a new vport defined by @ops. The vport will contain | |
112 | * a private data area of size @priv_size that can be accessed using | |
113 | * vport_priv(). vports that are no longer needed should be released with | |
114 | * vport_free(). | |
115 | */ | |
116 | struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops, | |
117 | const struct vport_parms *parms) | |
118 | { | |
119 | struct vport *vport; | |
120 | size_t alloc_size; | |
121 | ||
122 | alloc_size = sizeof(struct vport); | |
123 | if (priv_size) { | |
124 | alloc_size = ALIGN(alloc_size, VPORT_ALIGN); | |
125 | alloc_size += priv_size; | |
126 | } | |
127 | ||
128 | vport = kzalloc(alloc_size, GFP_KERNEL); | |
129 | if (!vport) | |
130 | return ERR_PTR(-ENOMEM); | |
131 | ||
132 | vport->dp = parms->dp; | |
133 | vport->port_no = parms->port_no; | |
15e47304 | 134 | vport->upcall_portid = parms->upcall_portid; |
ccb1352e | 135 | vport->ops = ops; |
15eac2a7 | 136 | INIT_HLIST_NODE(&vport->dp_hash_node); |
ccb1352e | 137 | |
e0f0ecf3 | 138 | vport->percpu_stats = alloc_percpu(struct pcpu_tstats); |
f0a98ae8 DC |
139 | if (!vport->percpu_stats) { |
140 | kfree(vport); | |
ccb1352e | 141 | return ERR_PTR(-ENOMEM); |
f0a98ae8 | 142 | } |
ccb1352e JG |
143 | |
144 | spin_lock_init(&vport->stats_lock); | |
145 | ||
146 | return vport; | |
147 | } | |
148 | ||
149 | /** | |
150 | * ovs_vport_free - uninitialize and free vport | |
151 | * | |
152 | * @vport: vport to free | |
153 | * | |
154 | * Frees a vport allocated with vport_alloc() when it is no longer needed. | |
155 | * | |
156 | * The caller must ensure that an RCU grace period has passed since the last | |
157 | * time @vport was in a datapath. | |
158 | */ | |
159 | void ovs_vport_free(struct vport *vport) | |
160 | { | |
161 | free_percpu(vport->percpu_stats); | |
162 | kfree(vport); | |
163 | } | |
164 | ||
165 | /** | |
166 | * ovs_vport_add - add vport device (for kernel callers) | |
167 | * | |
168 | * @parms: Information about new vport. | |
169 | * | |
170 | * Creates a new vport with the specified configuration (which is dependent on | |
8e4e1713 | 171 | * device type). ovs_mutex must be held. |
ccb1352e JG |
172 | */ |
173 | struct vport *ovs_vport_add(const struct vport_parms *parms) | |
174 | { | |
175 | struct vport *vport; | |
176 | int err = 0; | |
177 | int i; | |
178 | ||
ccb1352e JG |
179 | for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) { |
180 | if (vport_ops_list[i]->type == parms->type) { | |
46df7b81 PS |
181 | struct hlist_head *bucket; |
182 | ||
ccb1352e JG |
183 | vport = vport_ops_list[i]->create(parms); |
184 | if (IS_ERR(vport)) { | |
185 | err = PTR_ERR(vport); | |
186 | goto out; | |
187 | } | |
188 | ||
46df7b81 PS |
189 | bucket = hash_bucket(ovs_dp_get_net(vport->dp), |
190 | vport->ops->get_name(vport)); | |
191 | hlist_add_head_rcu(&vport->hash_node, bucket); | |
ccb1352e JG |
192 | return vport; |
193 | } | |
194 | } | |
195 | ||
196 | err = -EAFNOSUPPORT; | |
197 | ||
198 | out: | |
199 | return ERR_PTR(err); | |
200 | } | |
201 | ||
202 | /** | |
203 | * ovs_vport_set_options - modify existing vport device (for kernel callers) | |
204 | * | |
205 | * @vport: vport to modify. | |
2694838d | 206 | * @options: New configuration. |
ccb1352e JG |
207 | * |
208 | * Modifies an existing device with the specified configuration (which is | |
8e4e1713 | 209 | * dependent on device type). ovs_mutex must be held. |
ccb1352e JG |
210 | */ |
211 | int ovs_vport_set_options(struct vport *vport, struct nlattr *options) | |
212 | { | |
ccb1352e JG |
213 | if (!vport->ops->set_options) |
214 | return -EOPNOTSUPP; | |
215 | return vport->ops->set_options(vport, options); | |
216 | } | |
217 | ||
218 | /** | |
219 | * ovs_vport_del - delete existing vport device | |
220 | * | |
221 | * @vport: vport to delete. | |
222 | * | |
223 | * Detaches @vport from its datapath and destroys it. It is possible to fail | |
8e4e1713 | 224 | * for reasons such as lack of memory. ovs_mutex must be held. |
ccb1352e JG |
225 | */ |
226 | void ovs_vport_del(struct vport *vport) | |
227 | { | |
8e4e1713 | 228 | ASSERT_OVSL(); |
ccb1352e JG |
229 | |
230 | hlist_del_rcu(&vport->hash_node); | |
231 | ||
232 | vport->ops->destroy(vport); | |
233 | } | |
234 | ||
235 | /** | |
236 | * ovs_vport_get_stats - retrieve device stats | |
237 | * | |
238 | * @vport: vport from which to retrieve the stats | |
239 | * @stats: location to store stats | |
240 | * | |
241 | * Retrieves transmit, receive, and error stats for the given device. | |
242 | * | |
8e4e1713 | 243 | * Must be called with ovs_mutex or rcu_read_lock. |
ccb1352e JG |
244 | */ |
245 | void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats) | |
246 | { | |
247 | int i; | |
248 | ||
249 | memset(stats, 0, sizeof(*stats)); | |
250 | ||
251 | /* We potentially have 2 sources of stats that need to be combined: | |
252 | * those we have collected (split into err_stats and percpu_stats) from | |
253 | * set_stats() and device error stats from netdev->get_stats() (for | |
254 | * errors that happen downstream and therefore aren't reported through | |
255 | * our vport_record_error() function). | |
256 | * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS). | |
257 | * netdev-stats can be directly read over netlink-ioctl. | |
258 | */ | |
259 | ||
260 | spin_lock_bh(&vport->stats_lock); | |
261 | ||
262 | stats->rx_errors = vport->err_stats.rx_errors; | |
263 | stats->tx_errors = vport->err_stats.tx_errors; | |
264 | stats->tx_dropped = vport->err_stats.tx_dropped; | |
265 | stats->rx_dropped = vport->err_stats.rx_dropped; | |
266 | ||
267 | spin_unlock_bh(&vport->stats_lock); | |
268 | ||
269 | for_each_possible_cpu(i) { | |
e0f0ecf3 PS |
270 | const struct pcpu_tstats *percpu_stats; |
271 | struct pcpu_tstats local_stats; | |
ccb1352e JG |
272 | unsigned int start; |
273 | ||
274 | percpu_stats = per_cpu_ptr(vport->percpu_stats, i); | |
275 | ||
276 | do { | |
e0f0ecf3 | 277 | start = u64_stats_fetch_begin_bh(&percpu_stats->syncp); |
ccb1352e | 278 | local_stats = *percpu_stats; |
e0f0ecf3 | 279 | } while (u64_stats_fetch_retry_bh(&percpu_stats->syncp, start)); |
ccb1352e JG |
280 | |
281 | stats->rx_bytes += local_stats.rx_bytes; | |
282 | stats->rx_packets += local_stats.rx_packets; | |
283 | stats->tx_bytes += local_stats.tx_bytes; | |
284 | stats->tx_packets += local_stats.tx_packets; | |
285 | } | |
286 | } | |
287 | ||
288 | /** | |
289 | * ovs_vport_get_options - retrieve device options | |
290 | * | |
291 | * @vport: vport from which to retrieve the options. | |
292 | * @skb: sk_buff where options should be appended. | |
293 | * | |
294 | * Retrieves the configuration of the given device, appending an | |
295 | * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested | |
296 | * vport-specific attributes to @skb. | |
297 | * | |
298 | * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another | |
299 | * negative error code if a real error occurred. If an error occurs, @skb is | |
300 | * left unmodified. | |
301 | * | |
8e4e1713 | 302 | * Must be called with ovs_mutex or rcu_read_lock. |
ccb1352e JG |
303 | */ |
304 | int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb) | |
305 | { | |
306 | struct nlattr *nla; | |
5d963352 TG |
307 | int err; |
308 | ||
309 | if (!vport->ops->get_options) | |
310 | return 0; | |
ccb1352e JG |
311 | |
312 | nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS); | |
313 | if (!nla) | |
314 | return -EMSGSIZE; | |
315 | ||
5d963352 TG |
316 | err = vport->ops->get_options(vport, skb); |
317 | if (err) { | |
318 | nla_nest_cancel(skb, nla); | |
319 | return err; | |
ccb1352e JG |
320 | } |
321 | ||
322 | nla_nest_end(skb, nla); | |
323 | return 0; | |
324 | } | |
325 | ||
326 | /** | |
327 | * ovs_vport_receive - pass up received packet to the datapath for processing | |
328 | * | |
329 | * @vport: vport that received the packet | |
330 | * @skb: skb that was received | |
2694838d | 331 | * @tun_key: tunnel (if any) that carried packet |
ccb1352e JG |
332 | * |
333 | * Must be called with rcu_read_lock. The packet cannot be shared and | |
d176ca2a | 334 | * skb->data should point to the Ethernet header. |
ccb1352e | 335 | */ |
7d5437c7 PS |
336 | void ovs_vport_receive(struct vport *vport, struct sk_buff *skb, |
337 | struct ovs_key_ipv4_tunnel *tun_key) | |
ccb1352e | 338 | { |
e0f0ecf3 | 339 | struct pcpu_tstats *stats; |
ccb1352e | 340 | |
404f2f10 | 341 | stats = this_cpu_ptr(vport->percpu_stats); |
e0f0ecf3 | 342 | u64_stats_update_begin(&stats->syncp); |
ccb1352e JG |
343 | stats->rx_packets++; |
344 | stats->rx_bytes += skb->len; | |
e0f0ecf3 | 345 | u64_stats_update_end(&stats->syncp); |
ccb1352e | 346 | |
7d5437c7 | 347 | OVS_CB(skb)->tun_key = tun_key; |
ccb1352e JG |
348 | ovs_dp_process_received_packet(vport, skb); |
349 | } | |
350 | ||
351 | /** | |
352 | * ovs_vport_send - send a packet on a device | |
353 | * | |
354 | * @vport: vport on which to send the packet | |
355 | * @skb: skb to send | |
356 | * | |
8e4e1713 | 357 | * Sends the given packet and returns the length of data sent. Either ovs |
ccb1352e JG |
358 | * lock or rcu_read_lock must be held. |
359 | */ | |
360 | int ovs_vport_send(struct vport *vport, struct sk_buff *skb) | |
361 | { | |
362 | int sent = vport->ops->send(vport, skb); | |
363 | ||
91b7514c | 364 | if (likely(sent > 0)) { |
e0f0ecf3 | 365 | struct pcpu_tstats *stats; |
ccb1352e | 366 | |
404f2f10 | 367 | stats = this_cpu_ptr(vport->percpu_stats); |
ccb1352e | 368 | |
e0f0ecf3 | 369 | u64_stats_update_begin(&stats->syncp); |
ccb1352e JG |
370 | stats->tx_packets++; |
371 | stats->tx_bytes += sent; | |
e0f0ecf3 | 372 | u64_stats_update_end(&stats->syncp); |
91b7514c PS |
373 | } else if (sent < 0) { |
374 | ovs_vport_record_error(vport, VPORT_E_TX_ERROR); | |
375 | kfree_skb(skb); | |
376 | } else | |
377 | ovs_vport_record_error(vport, VPORT_E_TX_DROPPED); | |
378 | ||
ccb1352e JG |
379 | return sent; |
380 | } | |
381 | ||
382 | /** | |
383 | * ovs_vport_record_error - indicate device error to generic stats layer | |
384 | * | |
385 | * @vport: vport that encountered the error | |
386 | * @err_type: one of enum vport_err_type types to indicate the error type | |
387 | * | |
388 | * If using the vport generic stats layer indicate that an error of the given | |
af784163 | 389 | * type has occurred. |
ccb1352e JG |
390 | */ |
391 | void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type) | |
392 | { | |
393 | spin_lock(&vport->stats_lock); | |
394 | ||
395 | switch (err_type) { | |
396 | case VPORT_E_RX_DROPPED: | |
397 | vport->err_stats.rx_dropped++; | |
398 | break; | |
399 | ||
400 | case VPORT_E_RX_ERROR: | |
401 | vport->err_stats.rx_errors++; | |
402 | break; | |
403 | ||
404 | case VPORT_E_TX_DROPPED: | |
405 | vport->err_stats.tx_dropped++; | |
406 | break; | |
407 | ||
408 | case VPORT_E_TX_ERROR: | |
409 | vport->err_stats.tx_errors++; | |
410 | break; | |
a2bf91b5 | 411 | } |
ccb1352e JG |
412 | |
413 | spin_unlock(&vport->stats_lock); | |
414 | } | |
aa310701 PS |
415 | |
416 | static void free_vport_rcu(struct rcu_head *rcu) | |
417 | { | |
418 | struct vport *vport = container_of(rcu, struct vport, rcu); | |
419 | ||
420 | ovs_vport_free(vport); | |
421 | } | |
422 | ||
423 | void ovs_vport_deferred_free(struct vport *vport) | |
424 | { | |
425 | if (!vport) | |
426 | return; | |
427 | ||
428 | call_rcu(&vport->rcu, free_vport_rcu); | |
429 | } |