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