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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; | |
ccb1352e | 137 | vport->ops = ops; |
15eac2a7 | 138 | INIT_HLIST_NODE(&vport->dp_hash_node); |
ccb1352e | 139 | |
5cd667b0 AW |
140 | if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) |
141 | return ERR_PTR(-EINVAL); | |
142 | ||
1c213bd2 | 143 | vport->percpu_stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
f0a98ae8 DC |
144 | if (!vport->percpu_stats) { |
145 | kfree(vport); | |
ccb1352e | 146 | return ERR_PTR(-ENOMEM); |
f0a98ae8 | 147 | } |
ccb1352e JG |
148 | |
149 | spin_lock_init(&vport->stats_lock); | |
150 | ||
151 | return vport; | |
152 | } | |
153 | ||
154 | /** | |
155 | * ovs_vport_free - uninitialize and free vport | |
156 | * | |
157 | * @vport: vport to free | |
158 | * | |
159 | * Frees a vport allocated with vport_alloc() when it is no longer needed. | |
160 | * | |
161 | * The caller must ensure that an RCU grace period has passed since the last | |
162 | * time @vport was in a datapath. | |
163 | */ | |
164 | void ovs_vport_free(struct vport *vport) | |
165 | { | |
5cd667b0 AW |
166 | /* vport is freed from RCU callback or error path, Therefore |
167 | * it is safe to use raw dereference. | |
168 | */ | |
169 | kfree(rcu_dereference_raw(vport->upcall_portids)); | |
ccb1352e JG |
170 | free_percpu(vport->percpu_stats); |
171 | kfree(vport); | |
172 | } | |
173 | ||
174 | /** | |
175 | * ovs_vport_add - add vport device (for kernel callers) | |
176 | * | |
177 | * @parms: Information about new vport. | |
178 | * | |
179 | * Creates a new vport with the specified configuration (which is dependent on | |
8e4e1713 | 180 | * device type). ovs_mutex must be held. |
ccb1352e JG |
181 | */ |
182 | struct vport *ovs_vport_add(const struct vport_parms *parms) | |
183 | { | |
184 | struct vport *vport; | |
185 | int err = 0; | |
186 | int i; | |
187 | ||
ccb1352e JG |
188 | for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) { |
189 | if (vport_ops_list[i]->type == parms->type) { | |
46df7b81 PS |
190 | struct hlist_head *bucket; |
191 | ||
ccb1352e JG |
192 | vport = vport_ops_list[i]->create(parms); |
193 | if (IS_ERR(vport)) { | |
194 | err = PTR_ERR(vport); | |
195 | goto out; | |
196 | } | |
197 | ||
46df7b81 PS |
198 | bucket = hash_bucket(ovs_dp_get_net(vport->dp), |
199 | vport->ops->get_name(vport)); | |
200 | hlist_add_head_rcu(&vport->hash_node, bucket); | |
ccb1352e JG |
201 | return vport; |
202 | } | |
203 | } | |
204 | ||
205 | err = -EAFNOSUPPORT; | |
206 | ||
207 | out: | |
208 | return ERR_PTR(err); | |
209 | } | |
210 | ||
211 | /** | |
212 | * ovs_vport_set_options - modify existing vport device (for kernel callers) | |
213 | * | |
214 | * @vport: vport to modify. | |
2694838d | 215 | * @options: New configuration. |
ccb1352e JG |
216 | * |
217 | * Modifies an existing device with the specified configuration (which is | |
8e4e1713 | 218 | * dependent on device type). ovs_mutex must be held. |
ccb1352e JG |
219 | */ |
220 | int ovs_vport_set_options(struct vport *vport, struct nlattr *options) | |
221 | { | |
ccb1352e JG |
222 | if (!vport->ops->set_options) |
223 | return -EOPNOTSUPP; | |
224 | return vport->ops->set_options(vport, options); | |
225 | } | |
226 | ||
227 | /** | |
228 | * ovs_vport_del - delete existing vport device | |
229 | * | |
230 | * @vport: vport to delete. | |
231 | * | |
232 | * Detaches @vport from its datapath and destroys it. It is possible to fail | |
8e4e1713 | 233 | * for reasons such as lack of memory. ovs_mutex must be held. |
ccb1352e JG |
234 | */ |
235 | void ovs_vport_del(struct vport *vport) | |
236 | { | |
8e4e1713 | 237 | ASSERT_OVSL(); |
ccb1352e JG |
238 | |
239 | hlist_del_rcu(&vport->hash_node); | |
240 | ||
241 | vport->ops->destroy(vport); | |
242 | } | |
243 | ||
244 | /** | |
245 | * ovs_vport_get_stats - retrieve device stats | |
246 | * | |
247 | * @vport: vport from which to retrieve the stats | |
248 | * @stats: location to store stats | |
249 | * | |
250 | * Retrieves transmit, receive, and error stats for the given device. | |
251 | * | |
8e4e1713 | 252 | * Must be called with ovs_mutex or rcu_read_lock. |
ccb1352e JG |
253 | */ |
254 | void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats) | |
255 | { | |
256 | int i; | |
257 | ||
258 | memset(stats, 0, sizeof(*stats)); | |
259 | ||
260 | /* We potentially have 2 sources of stats that need to be combined: | |
261 | * those we have collected (split into err_stats and percpu_stats) from | |
262 | * set_stats() and device error stats from netdev->get_stats() (for | |
263 | * errors that happen downstream and therefore aren't reported through | |
264 | * our vport_record_error() function). | |
265 | * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS). | |
266 | * netdev-stats can be directly read over netlink-ioctl. | |
267 | */ | |
268 | ||
269 | spin_lock_bh(&vport->stats_lock); | |
270 | ||
271 | stats->rx_errors = vport->err_stats.rx_errors; | |
272 | stats->tx_errors = vport->err_stats.tx_errors; | |
273 | stats->tx_dropped = vport->err_stats.tx_dropped; | |
274 | stats->rx_dropped = vport->err_stats.rx_dropped; | |
275 | ||
276 | spin_unlock_bh(&vport->stats_lock); | |
277 | ||
278 | for_each_possible_cpu(i) { | |
8f84985f LR |
279 | const struct pcpu_sw_netstats *percpu_stats; |
280 | struct pcpu_sw_netstats local_stats; | |
ccb1352e JG |
281 | unsigned int start; |
282 | ||
283 | percpu_stats = per_cpu_ptr(vport->percpu_stats, i); | |
284 | ||
285 | do { | |
57a7744e | 286 | start = u64_stats_fetch_begin_irq(&percpu_stats->syncp); |
ccb1352e | 287 | local_stats = *percpu_stats; |
57a7744e | 288 | } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); |
ccb1352e JG |
289 | |
290 | stats->rx_bytes += local_stats.rx_bytes; | |
291 | stats->rx_packets += local_stats.rx_packets; | |
292 | stats->tx_bytes += local_stats.tx_bytes; | |
293 | stats->tx_packets += local_stats.tx_packets; | |
294 | } | |
295 | } | |
296 | ||
297 | /** | |
298 | * ovs_vport_get_options - retrieve device options | |
299 | * | |
300 | * @vport: vport from which to retrieve the options. | |
301 | * @skb: sk_buff where options should be appended. | |
302 | * | |
303 | * Retrieves the configuration of the given device, appending an | |
304 | * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested | |
305 | * vport-specific attributes to @skb. | |
306 | * | |
307 | * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another | |
308 | * negative error code if a real error occurred. If an error occurs, @skb is | |
309 | * left unmodified. | |
310 | * | |
8e4e1713 | 311 | * Must be called with ovs_mutex or rcu_read_lock. |
ccb1352e JG |
312 | */ |
313 | int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb) | |
314 | { | |
315 | struct nlattr *nla; | |
5d963352 TG |
316 | int err; |
317 | ||
318 | if (!vport->ops->get_options) | |
319 | return 0; | |
ccb1352e JG |
320 | |
321 | nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS); | |
322 | if (!nla) | |
323 | return -EMSGSIZE; | |
324 | ||
5d963352 TG |
325 | err = vport->ops->get_options(vport, skb); |
326 | if (err) { | |
327 | nla_nest_cancel(skb, nla); | |
328 | return err; | |
ccb1352e JG |
329 | } |
330 | ||
331 | nla_nest_end(skb, nla); | |
332 | return 0; | |
333 | } | |
334 | ||
5cd667b0 AW |
335 | /** |
336 | * ovs_vport_set_upcall_portids - set upcall portids of @vport. | |
337 | * | |
338 | * @vport: vport to modify. | |
339 | * @ids: new configuration, an array of port ids. | |
340 | * | |
341 | * Sets the vport's upcall_portids to @ids. | |
342 | * | |
343 | * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed | |
344 | * as an array of U32. | |
345 | * | |
346 | * Must be called with ovs_mutex. | |
347 | */ | |
348 | int ovs_vport_set_upcall_portids(struct vport *vport, struct nlattr *ids) | |
349 | { | |
350 | struct vport_portids *old, *vport_portids; | |
351 | ||
352 | if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) | |
353 | return -EINVAL; | |
354 | ||
355 | old = ovsl_dereference(vport->upcall_portids); | |
356 | ||
357 | vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids), | |
358 | GFP_KERNEL); | |
359 | if (!vport_portids) | |
360 | return -ENOMEM; | |
361 | ||
362 | vport_portids->n_ids = nla_len(ids) / sizeof(u32); | |
363 | vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids); | |
364 | nla_memcpy(vport_portids->ids, ids, nla_len(ids)); | |
365 | ||
366 | rcu_assign_pointer(vport->upcall_portids, vport_portids); | |
367 | ||
368 | if (old) | |
369 | kfree_rcu(old, rcu); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | /** | |
374 | * ovs_vport_get_upcall_portids - get the upcall_portids of @vport. | |
375 | * | |
376 | * @vport: vport from which to retrieve the portids. | |
377 | * @skb: sk_buff where portids should be appended. | |
378 | * | |
379 | * Retrieves the configuration of the given vport, appending the | |
380 | * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall | |
381 | * portids to @skb. | |
382 | * | |
383 | * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room. | |
384 | * If an error occurs, @skb is left unmodified. Must be called with | |
385 | * ovs_mutex or rcu_read_lock. | |
386 | */ | |
387 | int ovs_vport_get_upcall_portids(const struct vport *vport, | |
388 | struct sk_buff *skb) | |
389 | { | |
390 | struct vport_portids *ids; | |
391 | ||
392 | ids = rcu_dereference_ovsl(vport->upcall_portids); | |
393 | ||
394 | if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS) | |
395 | return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID, | |
396 | ids->n_ids * sizeof(u32), (void *)ids->ids); | |
397 | else | |
398 | return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]); | |
399 | } | |
400 | ||
401 | /** | |
402 | * ovs_vport_find_upcall_portid - find the upcall portid to send upcall. | |
403 | * | |
404 | * @vport: vport from which the missed packet is received. | |
405 | * @skb: skb that the missed packet was received. | |
406 | * | |
407 | * Uses the skb_get_hash() to select the upcall portid to send the | |
408 | * upcall. | |
409 | * | |
410 | * Returns the portid of the target socket. Must be called with rcu_read_lock. | |
411 | */ | |
412 | u32 ovs_vport_find_upcall_portid(const struct vport *p, struct sk_buff *skb) | |
413 | { | |
414 | struct vport_portids *ids; | |
415 | u32 ids_index; | |
416 | u32 hash; | |
417 | ||
418 | ids = rcu_dereference(p->upcall_portids); | |
419 | ||
420 | if (ids->n_ids == 1 && ids->ids[0] == 0) | |
421 | return 0; | |
422 | ||
423 | hash = skb_get_hash(skb); | |
424 | ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids); | |
425 | return ids->ids[ids_index]; | |
426 | } | |
427 | ||
ccb1352e JG |
428 | /** |
429 | * ovs_vport_receive - pass up received packet to the datapath for processing | |
430 | * | |
431 | * @vport: vport that received the packet | |
432 | * @skb: skb that was received | |
2694838d | 433 | * @tun_key: tunnel (if any) that carried packet |
ccb1352e JG |
434 | * |
435 | * Must be called with rcu_read_lock. The packet cannot be shared and | |
d176ca2a | 436 | * skb->data should point to the Ethernet header. |
ccb1352e | 437 | */ |
7d5437c7 PS |
438 | void ovs_vport_receive(struct vport *vport, struct sk_buff *skb, |
439 | struct ovs_key_ipv4_tunnel *tun_key) | |
ccb1352e | 440 | { |
8f84985f | 441 | struct pcpu_sw_netstats *stats; |
ccb1352e | 442 | |
404f2f10 | 443 | stats = this_cpu_ptr(vport->percpu_stats); |
e0f0ecf3 | 444 | u64_stats_update_begin(&stats->syncp); |
ccb1352e JG |
445 | stats->rx_packets++; |
446 | stats->rx_bytes += skb->len; | |
e0f0ecf3 | 447 | u64_stats_update_end(&stats->syncp); |
ccb1352e | 448 | |
7d5437c7 | 449 | OVS_CB(skb)->tun_key = tun_key; |
ccb1352e JG |
450 | ovs_dp_process_received_packet(vport, skb); |
451 | } | |
452 | ||
453 | /** | |
454 | * ovs_vport_send - send a packet on a device | |
455 | * | |
456 | * @vport: vport on which to send the packet | |
457 | * @skb: skb to send | |
458 | * | |
8e4e1713 | 459 | * Sends the given packet and returns the length of data sent. Either ovs |
ccb1352e JG |
460 | * lock or rcu_read_lock must be held. |
461 | */ | |
462 | int ovs_vport_send(struct vport *vport, struct sk_buff *skb) | |
463 | { | |
464 | int sent = vport->ops->send(vport, skb); | |
465 | ||
91b7514c | 466 | if (likely(sent > 0)) { |
8f84985f | 467 | struct pcpu_sw_netstats *stats; |
ccb1352e | 468 | |
404f2f10 | 469 | stats = this_cpu_ptr(vport->percpu_stats); |
ccb1352e | 470 | |
e0f0ecf3 | 471 | u64_stats_update_begin(&stats->syncp); |
ccb1352e JG |
472 | stats->tx_packets++; |
473 | stats->tx_bytes += sent; | |
e0f0ecf3 | 474 | u64_stats_update_end(&stats->syncp); |
91b7514c PS |
475 | } else if (sent < 0) { |
476 | ovs_vport_record_error(vport, VPORT_E_TX_ERROR); | |
477 | kfree_skb(skb); | |
478 | } else | |
479 | ovs_vport_record_error(vport, VPORT_E_TX_DROPPED); | |
480 | ||
ccb1352e JG |
481 | return sent; |
482 | } | |
483 | ||
484 | /** | |
485 | * ovs_vport_record_error - indicate device error to generic stats layer | |
486 | * | |
487 | * @vport: vport that encountered the error | |
488 | * @err_type: one of enum vport_err_type types to indicate the error type | |
489 | * | |
490 | * If using the vport generic stats layer indicate that an error of the given | |
af784163 | 491 | * type has occurred. |
ccb1352e | 492 | */ |
443cd88c SH |
493 | static void ovs_vport_record_error(struct vport *vport, |
494 | enum vport_err_type err_type) | |
ccb1352e JG |
495 | { |
496 | spin_lock(&vport->stats_lock); | |
497 | ||
498 | switch (err_type) { | |
499 | case VPORT_E_RX_DROPPED: | |
500 | vport->err_stats.rx_dropped++; | |
501 | break; | |
502 | ||
503 | case VPORT_E_RX_ERROR: | |
504 | vport->err_stats.rx_errors++; | |
505 | break; | |
506 | ||
507 | case VPORT_E_TX_DROPPED: | |
508 | vport->err_stats.tx_dropped++; | |
509 | break; | |
510 | ||
511 | case VPORT_E_TX_ERROR: | |
512 | vport->err_stats.tx_errors++; | |
513 | break; | |
a2bf91b5 | 514 | } |
ccb1352e JG |
515 | |
516 | spin_unlock(&vport->stats_lock); | |
517 | } | |
aa310701 PS |
518 | |
519 | static void free_vport_rcu(struct rcu_head *rcu) | |
520 | { | |
521 | struct vport *vport = container_of(rcu, struct vport, rcu); | |
522 | ||
523 | ovs_vport_free(vport); | |
524 | } | |
525 | ||
526 | void ovs_vport_deferred_free(struct vport *vport) | |
527 | { | |
528 | if (!vport) | |
529 | return; | |
530 | ||
531 | call_rcu(&vport->rcu, free_vport_rcu); | |
532 | } |