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f2459fe7 | 1 | /* |
e0edde6f | 2 | * Copyright (c) 2007-2012 Nicira, Inc. |
f2459fe7 | 3 | * |
a9a29d22 JG |
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 | |
f2459fe7 JG |
17 | */ |
18 | ||
f2459fe7 JG |
19 | #include <linux/etherdevice.h> |
20 | #include <linux/if.h> | |
38aeef15 | 21 | #include <linux/if_vlan.h> |
2a4999f3 | 22 | #include <linux/jhash.h> |
2be0b371 | 23 | #include <linux/kconfig.h> |
f2459fe7 JG |
24 | #include <linux/kernel.h> |
25 | #include <linux/list.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/percpu.h> | |
057dd6d2 | 28 | #include <linux/rcupdate.h> |
f2459fe7 | 29 | #include <linux/rtnetlink.h> |
3fbd517a | 30 | #include <linux/compat.h> |
e90b1cf9 | 31 | #include <linux/version.h> |
2a4999f3 | 32 | #include <net/net_namespace.h> |
f2459fe7 | 33 | |
2a4999f3 | 34 | #include "datapath.h" |
f2459fe7 | 35 | #include "vport.h" |
b19e8815 | 36 | #include "vport-internal_dev.h" |
f2459fe7 | 37 | |
5953c70e JG |
38 | /* List of statically compiled vport implementations. Don't forget to also |
39 | * add yours to the list at the bottom of vport.h. */ | |
806b46ef | 40 | static const struct vport_ops *vport_ops_list[] = { |
850b6b3b JG |
41 | &ovs_netdev_vport_ops, |
42 | &ovs_internal_vport_ops, | |
2be0b371 | 43 | #if IS_ENABLED(CONFIG_NET_IPGRE_DEMUX) |
850b6b3b | 44 | &ovs_gre_vport_ops, |
2de795ad | 45 | &ovs_gre64_vport_ops, |
2be0b371 | 46 | #endif |
e90b1cf9 | 47 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26) |
79f827fa | 48 | &ovs_vxlan_vport_ops, |
a6ae068b | 49 | &ovs_lisp_vport_ops, |
e90b1cf9 | 50 | #endif |
f2459fe7 JG |
51 | }; |
52 | ||
cd2a59e9 | 53 | /* Protected by RCU read lock for reading, ovs_mutex for writing. */ |
f2459fe7 JG |
54 | static struct hlist_head *dev_table; |
55 | #define VPORT_HASH_BUCKETS 1024 | |
56 | ||
f2459fe7 | 57 | /** |
850b6b3b | 58 | * ovs_vport_init - initialize vport subsystem |
f2459fe7 | 59 | * |
806b46ef | 60 | * Called at module load time to initialize the vport subsystem. |
f2459fe7 | 61 | */ |
850b6b3b | 62 | int ovs_vport_init(void) |
f2459fe7 | 63 | { |
f2459fe7 JG |
64 | dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head), |
65 | GFP_KERNEL); | |
806b46ef PS |
66 | if (!dev_table) |
67 | return -ENOMEM; | |
f2459fe7 JG |
68 | |
69 | return 0; | |
f2459fe7 JG |
70 | } |
71 | ||
f2459fe7 | 72 | /** |
850b6b3b | 73 | * ovs_vport_exit - shutdown vport subsystem |
f2459fe7 | 74 | * |
806b46ef | 75 | * Called at module exit time to shutdown the vport subsystem. |
f2459fe7 | 76 | */ |
850b6b3b | 77 | void ovs_vport_exit(void) |
f2459fe7 | 78 | { |
f2459fe7 JG |
79 | kfree(dev_table); |
80 | } | |
81 | ||
2a4999f3 | 82 | static struct hlist_head *hash_bucket(struct net *net, const char *name) |
f2459fe7 | 83 | { |
2a4999f3 | 84 | unsigned int hash = jhash(name, strlen(name), (unsigned long) net); |
f2459fe7 JG |
85 | return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)]; |
86 | } | |
87 | ||
88 | /** | |
850b6b3b | 89 | * ovs_vport_locate - find a port that has already been created |
f2459fe7 JG |
90 | * |
91 | * @name: name of port to find | |
92 | * | |
cd2a59e9 | 93 | * Must be called with ovs or RCU read lock. |
f2459fe7 | 94 | */ |
2a4999f3 | 95 | struct vport *ovs_vport_locate(struct net *net, const char *name) |
f2459fe7 | 96 | { |
2a4999f3 | 97 | struct hlist_head *bucket = hash_bucket(net, name); |
f2459fe7 | 98 | struct vport *vport; |
f2459fe7 | 99 | |
f8dfbcb7 | 100 | hlist_for_each_entry_rcu(vport, bucket, hash_node) |
2a4999f3 PS |
101 | if (!strcmp(name, vport->ops->get_name(vport)) && |
102 | net_eq(ovs_dp_get_net(vport->dp), net)) | |
057dd6d2 | 103 | return vport; |
f2459fe7 | 104 | |
057dd6d2 | 105 | return NULL; |
f2459fe7 JG |
106 | } |
107 | ||
108 | /** | |
850b6b3b | 109 | * ovs_vport_alloc - allocate and initialize new vport |
f2459fe7 JG |
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 | |
850b6b3b | 117 | * ovs_vport_free(). |
f2459fe7 | 118 | */ |
850b6b3b JG |
119 | struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops, |
120 | const struct vport_parms *parms) | |
f2459fe7 JG |
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 | ||
e779d8d9 BP |
135 | vport->dp = parms->dp; |
136 | vport->port_no = parms->port_no; | |
28aea917 | 137 | vport->upcall_portid = parms->upcall_portid; |
f2459fe7 | 138 | vport->ops = ops; |
95b1d73a | 139 | INIT_HLIST_NODE(&vport->dp_hash_node); |
f2459fe7 | 140 | |
a0049ffc | 141 | vport->percpu_stats = alloc_percpu(struct pcpu_tstats); |
9697e433 DC |
142 | if (!vport->percpu_stats) { |
143 | kfree(vport); | |
f613a0d7 | 144 | return ERR_PTR(-ENOMEM); |
9697e433 | 145 | } |
f2459fe7 | 146 | |
f613a0d7 | 147 | spin_lock_init(&vport->stats_lock); |
f2459fe7 JG |
148 | |
149 | return vport; | |
150 | } | |
151 | ||
152 | /** | |
850b6b3b | 153 | * ovs_vport_free - uninitialize and free vport |
f2459fe7 JG |
154 | * |
155 | * @vport: vport to free | |
156 | * | |
850b6b3b | 157 | * Frees a vport allocated with ovs_vport_alloc() when it is no longer needed. |
057dd6d2 BP |
158 | * |
159 | * The caller must ensure that an RCU grace period has passed since the last | |
160 | * time @vport was in a datapath. | |
f2459fe7 | 161 | */ |
850b6b3b | 162 | void ovs_vport_free(struct vport *vport) |
f2459fe7 | 163 | { |
f613a0d7 | 164 | free_percpu(vport->percpu_stats); |
5ca1ba48 | 165 | kfree(vport); |
f2459fe7 JG |
166 | } |
167 | ||
168 | /** | |
850b6b3b | 169 | * ovs_vport_add - add vport device (for kernel callers) |
f2459fe7 | 170 | * |
94903c98 | 171 | * @parms: Information about new vport. |
f2459fe7 | 172 | * |
7237e4f4 | 173 | * Creates a new vport with the specified configuration (which is dependent on |
cd2a59e9 | 174 | * device type). ovs_mutex must be held. |
f2459fe7 | 175 | */ |
850b6b3b | 176 | struct vport *ovs_vport_add(const struct vport_parms *parms) |
f2459fe7 JG |
177 | { |
178 | struct vport *vport; | |
179 | int err = 0; | |
180 | int i; | |
181 | ||
806b46ef | 182 | for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) { |
c283069c | 183 | if (vport_ops_list[i]->type == parms->type) { |
2a4999f3 PS |
184 | struct hlist_head *bucket; |
185 | ||
94903c98 | 186 | vport = vport_ops_list[i]->create(parms); |
f2459fe7 JG |
187 | if (IS_ERR(vport)) { |
188 | err = PTR_ERR(vport); | |
189 | goto out; | |
190 | } | |
191 | ||
2a4999f3 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); | |
f2459fe7 JG |
195 | return vport; |
196 | } | |
197 | } | |
198 | ||
199 | err = -EAFNOSUPPORT; | |
200 | ||
201 | out: | |
202 | return ERR_PTR(err); | |
203 | } | |
204 | ||
205 | /** | |
850b6b3b | 206 | * ovs_vport_set_options - modify existing vport device (for kernel callers) |
f2459fe7 JG |
207 | * |
208 | * @vport: vport to modify. | |
c3827f61 | 209 | * @port: New configuration. |
f2459fe7 JG |
210 | * |
211 | * Modifies an existing device with the specified configuration (which is | |
cd2a59e9 | 212 | * dependent on device type). ovs_mutex must be held. |
f2459fe7 | 213 | */ |
850b6b3b | 214 | int ovs_vport_set_options(struct vport *vport, struct nlattr *options) |
f2459fe7 | 215 | { |
c19e6535 | 216 | if (!vport->ops->set_options) |
f2459fe7 | 217 | return -EOPNOTSUPP; |
c19e6535 | 218 | return vport->ops->set_options(vport, options); |
f2459fe7 JG |
219 | } |
220 | ||
221 | /** | |
850b6b3b | 222 | * ovs_vport_del - delete existing vport device |
f2459fe7 JG |
223 | * |
224 | * @vport: vport to delete. | |
225 | * | |
7237e4f4 | 226 | * Detaches @vport from its datapath and destroys it. It is possible to fail |
cd2a59e9 | 227 | * for reasons such as lack of memory. ovs_mutex must be held. |
f2459fe7 | 228 | */ |
850b6b3b | 229 | void ovs_vport_del(struct vport *vport) |
f2459fe7 | 230 | { |
cd2a59e9 | 231 | ASSERT_OVSL(); |
f2459fe7 | 232 | |
057dd6d2 | 233 | hlist_del_rcu(&vport->hash_node); |
3544358a | 234 | vport->ops->destroy(vport); |
f2459fe7 JG |
235 | } |
236 | ||
780e6207 | 237 | /** |
850b6b3b | 238 | * ovs_vport_set_stats - sets offset device stats |
780e6207 JG |
239 | * |
240 | * @vport: vport on which to set stats | |
241 | * @stats: stats to set | |
242 | * | |
243 | * Provides a set of transmit, receive, and error stats to be added as an | |
244 | * offset to the collect data when stats are retreived. Some devices may not | |
245 | * support setting the stats, in which case the result will always be | |
ed099e92 BP |
246 | * -EOPNOTSUPP. |
247 | * | |
cd2a59e9 | 248 | * Must be called with ovs_mutex. |
780e6207 | 249 | */ |
850b6b3b | 250 | void ovs_vport_set_stats(struct vport *vport, struct ovs_vport_stats *stats) |
780e6207 | 251 | { |
f613a0d7 PS |
252 | spin_lock_bh(&vport->stats_lock); |
253 | vport->offset_stats = *stats; | |
254 | spin_unlock_bh(&vport->stats_lock); | |
780e6207 JG |
255 | } |
256 | ||
780e6207 | 257 | /** |
850b6b3b | 258 | * ovs_vport_get_stats - retrieve device stats |
780e6207 JG |
259 | * |
260 | * @vport: vport from which to retrieve the stats | |
261 | * @stats: location to store stats | |
262 | * | |
263 | * Retrieves transmit, receive, and error stats for the given device. | |
ed099e92 | 264 | * |
cd2a59e9 | 265 | * Must be called with ovs_mutex or rcu_read_lock. |
780e6207 | 266 | */ |
850b6b3b | 267 | void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats) |
780e6207 | 268 | { |
bc22fc3e | 269 | int i; |
780e6207 | 270 | |
bc22fc3e BP |
271 | /* We potentially have 3 sources of stats that need to be |
272 | * combined: those we have collected (split into err_stats and | |
273 | * percpu_stats), offset_stats from set_stats(), and device | |
f613a0d7 | 274 | * error stats from netdev->get_stats() (for errors that happen |
bc22fc3e | 275 | * downstream and therefore aren't reported through our |
f613a0d7 PS |
276 | * vport_record_error() function). |
277 | * Stats from first two sources are merged and reported by ovs over | |
278 | * OVS_VPORT_ATTR_STATS. | |
279 | * netdev-stats can be directly read over netlink-ioctl. | |
280 | */ | |
780e6207 | 281 | |
bc22fc3e | 282 | spin_lock_bh(&vport->stats_lock); |
780e6207 | 283 | |
bc22fc3e | 284 | *stats = vport->offset_stats; |
780e6207 | 285 | |
bc22fc3e BP |
286 | stats->rx_errors += vport->err_stats.rx_errors; |
287 | stats->tx_errors += vport->err_stats.tx_errors; | |
288 | stats->tx_dropped += vport->err_stats.tx_dropped; | |
289 | stats->rx_dropped += vport->err_stats.rx_dropped; | |
780e6207 | 290 | |
bc22fc3e | 291 | spin_unlock_bh(&vport->stats_lock); |
780e6207 | 292 | |
bc22fc3e | 293 | for_each_possible_cpu(i) { |
a0049ffc PS |
294 | const struct pcpu_tstats *percpu_stats; |
295 | struct pcpu_tstats local_stats; | |
821cb9fa | 296 | unsigned int start; |
780e6207 | 297 | |
bc22fc3e | 298 | percpu_stats = per_cpu_ptr(vport->percpu_stats, i); |
38c6ecbc | 299 | |
bc22fc3e | 300 | do { |
a0049ffc | 301 | start = u64_stats_fetch_begin_bh(&percpu_stats->syncp); |
bc22fc3e | 302 | local_stats = *percpu_stats; |
a0049ffc | 303 | } while (u64_stats_fetch_retry_bh(&percpu_stats->syncp, start)); |
38c6ecbc | 304 | |
bc22fc3e BP |
305 | stats->rx_bytes += local_stats.rx_bytes; |
306 | stats->rx_packets += local_stats.rx_packets; | |
307 | stats->tx_bytes += local_stats.tx_bytes; | |
308 | stats->tx_packets += local_stats.tx_packets; | |
265d5020 | 309 | } |
780e6207 JG |
310 | } |
311 | ||
dd851cbb | 312 | /** |
850b6b3b | 313 | * ovs_vport_get_options - retrieve device options |
dd851cbb | 314 | * |
c19e6535 BP |
315 | * @vport: vport from which to retrieve the options. |
316 | * @skb: sk_buff where options should be appended. | |
dd851cbb | 317 | * |
c19e6535 | 318 | * Retrieves the configuration of the given device, appending an |
df2c07f4 | 319 | * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested |
ed099e92 | 320 | * vport-specific attributes to @skb. |
c19e6535 BP |
321 | * |
322 | * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another | |
f0fef760 BP |
323 | * negative error code if a real error occurred. If an error occurs, @skb is |
324 | * left unmodified. | |
ed099e92 | 325 | * |
cd2a59e9 | 326 | * Must be called with ovs_mutex or rcu_read_lock. |
dd851cbb | 327 | */ |
850b6b3b | 328 | int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb) |
dd851cbb | 329 | { |
c19e6535 | 330 | struct nlattr *nla; |
778ea0a4 TG |
331 | int err; |
332 | ||
333 | if (!vport->ops->get_options) | |
334 | return 0; | |
c19e6535 | 335 | |
df2c07f4 | 336 | nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS); |
c19e6535 BP |
337 | if (!nla) |
338 | return -EMSGSIZE; | |
339 | ||
778ea0a4 TG |
340 | err = vport->ops->get_options(vport, skb); |
341 | if (err) { | |
342 | nla_nest_cancel(skb, nla); | |
343 | return err; | |
c19e6535 BP |
344 | } |
345 | ||
346 | nla_nest_end(skb, nla); | |
347 | return 0; | |
dd851cbb JP |
348 | } |
349 | ||
f2459fe7 | 350 | /** |
850b6b3b | 351 | * ovs_vport_receive - pass up received packet to the datapath for processing |
f2459fe7 JG |
352 | * |
353 | * @vport: vport that received the packet | |
354 | * @skb: skb that was received | |
355 | * | |
8819fac7 JG |
356 | * Must be called with rcu_read_lock. The packet cannot be shared and |
357 | * skb->data should point to the Ethernet header. The caller must have already | |
358 | * called compute_ip_summed() to initialize the checksumming fields. | |
f2459fe7 | 359 | */ |
db0c3134 PS |
360 | void ovs_vport_receive(struct vport *vport, struct sk_buff *skb, |
361 | struct ovs_key_ipv4_tunnel *tun_key) | |
f2459fe7 | 362 | { |
a0049ffc | 363 | struct pcpu_tstats *stats; |
f2459fe7 | 364 | |
70dbc259 | 365 | stats = this_cpu_ptr(vport->percpu_stats); |
a0049ffc | 366 | u64_stats_update_begin(&stats->syncp); |
f613a0d7 PS |
367 | stats->rx_packets++; |
368 | stats->rx_bytes += skb->len; | |
a0049ffc | 369 | u64_stats_update_end(&stats->syncp); |
f2459fe7 | 370 | |
db0c3134 | 371 | OVS_CB(skb)->tun_key = tun_key; |
850b6b3b | 372 | ovs_dp_process_received_packet(vport, skb); |
f2459fe7 JG |
373 | } |
374 | ||
375 | /** | |
850b6b3b | 376 | * ovs_vport_send - send a packet on a device |
f2459fe7 JG |
377 | * |
378 | * @vport: vport on which to send the packet | |
379 | * @skb: skb to send | |
380 | * | |
cd2a59e9 | 381 | * Sends the given packet and returns the length of data sent. Either ovs |
f2459fe7 JG |
382 | * lock or rcu_read_lock must be held. |
383 | */ | |
850b6b3b | 384 | int ovs_vport_send(struct vport *vport, struct sk_buff *skb) |
f2459fe7 | 385 | { |
24b019f8 | 386 | int sent = vport->ops->send(vport, skb); |
f2459fe7 | 387 | |
6f7b24e3 | 388 | if (likely(sent > 0)) { |
a0049ffc | 389 | struct pcpu_tstats *stats; |
38c6ecbc | 390 | |
70dbc259 | 391 | stats = this_cpu_ptr(vport->percpu_stats); |
f2459fe7 | 392 | |
a0049ffc | 393 | u64_stats_update_begin(&stats->syncp); |
58d01ad9 PS |
394 | stats->tx_packets++; |
395 | stats->tx_bytes += sent; | |
a0049ffc | 396 | u64_stats_update_end(&stats->syncp); |
be7cd27e PS |
397 | } else if (sent < 0) { |
398 | ovs_vport_record_error(vport, VPORT_E_TX_ERROR); | |
399 | kfree_skb(skb); | |
400 | } else | |
401 | ovs_vport_record_error(vport, VPORT_E_TX_DROPPED); | |
402 | ||
55574bb0 | 403 | return sent; |
f2459fe7 JG |
404 | } |
405 | ||
406 | /** | |
850b6b3b | 407 | * ovs_vport_record_error - indicate device error to generic stats layer |
f2459fe7 JG |
408 | * |
409 | * @vport: vport that encountered the error | |
410 | * @err_type: one of enum vport_err_type types to indicate the error type | |
411 | * | |
412 | * If using the vport generic stats layer indicate that an error of the given | |
ec9f40dc | 413 | * type has occurred. |
f2459fe7 | 414 | */ |
850b6b3b | 415 | void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type) |
f2459fe7 | 416 | { |
e9141eec | 417 | spin_lock(&vport->stats_lock); |
f2459fe7 | 418 | |
f613a0d7 PS |
419 | switch (err_type) { |
420 | case VPORT_E_RX_DROPPED: | |
421 | vport->err_stats.rx_dropped++; | |
422 | break; | |
f2459fe7 | 423 | |
f613a0d7 PS |
424 | case VPORT_E_RX_ERROR: |
425 | vport->err_stats.rx_errors++; | |
426 | break; | |
f2459fe7 | 427 | |
f613a0d7 PS |
428 | case VPORT_E_TX_DROPPED: |
429 | vport->err_stats.tx_dropped++; | |
430 | break; | |
f2459fe7 | 431 | |
f613a0d7 PS |
432 | case VPORT_E_TX_ERROR: |
433 | vport->err_stats.tx_errors++; | |
434 | break; | |
8088f001 | 435 | } |
f2459fe7 | 436 | |
e9141eec | 437 | spin_unlock(&vport->stats_lock); |
f2459fe7 | 438 | } |
c405d282 PS |
439 | |
440 | static void free_vport_rcu(struct rcu_head *rcu) | |
441 | { | |
442 | struct vport *vport = container_of(rcu, struct vport, rcu); | |
443 | ||
444 | ovs_vport_free(vport); | |
445 | } | |
446 | ||
447 | void ovs_vport_deferred_free(struct vport *vport) | |
448 | { | |
449 | if (!vport) | |
450 | return; | |
451 | ||
452 | call_rcu(&vport->rcu, free_vport_rcu); | |
453 | } |