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2 * Copyright (c) 2007-2012 Nicira, Inc.
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.
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.
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
19 #include <linux/etherdevice.h>
21 #include <linux/if_vlan.h>
22 #include <linux/jhash.h>
23 #include <linux/kconfig.h>
24 #include <linux/kernel.h>
25 #include <linux/list.h>
26 #include <linux/mutex.h>
27 #include <linux/percpu.h>
28 #include <linux/rcupdate.h>
29 #include <linux/rtnetlink.h>
30 #include <linux/compat.h>
31 #include <linux/version.h>
32 #include <net/net_namespace.h>
36 #include "vport-internal_dev.h"
38 /* List of statically compiled vport implementations. Don't forget to also
39 * add yours to the list at the bottom of vport.h. */
40 static const struct vport_ops
*vport_ops_list
[] = {
41 &ovs_netdev_vport_ops
,
42 &ovs_internal_vport_ops
,
43 #if IS_ENABLED(CONFIG_NET_IPGRE_DEMUX)
51 /* Protected by RCU read lock for reading, ovs_mutex for writing. */
52 static struct hlist_head
*dev_table
;
53 #define VPORT_HASH_BUCKETS 1024
56 * ovs_vport_init - initialize vport subsystem
58 * Called at module load time to initialize the vport subsystem.
60 int ovs_vport_init(void)
62 dev_table
= kzalloc(VPORT_HASH_BUCKETS
* sizeof(struct hlist_head
),
71 * ovs_vport_exit - shutdown vport subsystem
73 * Called at module exit time to shutdown the vport subsystem.
75 void ovs_vport_exit(void)
80 static struct hlist_head
*hash_bucket(struct net
*net
, const char *name
)
82 unsigned int hash
= jhash(name
, strlen(name
), (unsigned long) net
);
83 return &dev_table
[hash
& (VPORT_HASH_BUCKETS
- 1)];
87 * ovs_vport_locate - find a port that has already been created
89 * @name: name of port to find
91 * Must be called with ovs or RCU read lock.
93 struct vport
*ovs_vport_locate(struct net
*net
, const char *name
)
95 struct hlist_head
*bucket
= hash_bucket(net
, name
);
98 hlist_for_each_entry_rcu(vport
, bucket
, hash_node
)
99 if (!strcmp(name
, vport
->ops
->get_name(vport
)) &&
100 net_eq(ovs_dp_get_net(vport
->dp
), net
))
107 * ovs_vport_alloc - allocate and initialize new vport
109 * @priv_size: Size of private data area to allocate.
110 * @ops: vport device ops
112 * Allocate and initialize a new vport defined by @ops. The vport will contain
113 * a private data area of size @priv_size that can be accessed using
114 * vport_priv(). vports that are no longer needed should be released with
117 struct vport
*ovs_vport_alloc(int priv_size
, const struct vport_ops
*ops
,
118 const struct vport_parms
*parms
)
123 alloc_size
= sizeof(struct vport
);
125 alloc_size
= ALIGN(alloc_size
, VPORT_ALIGN
);
126 alloc_size
+= priv_size
;
129 vport
= kzalloc(alloc_size
, GFP_KERNEL
);
131 return ERR_PTR(-ENOMEM
);
133 vport
->dp
= parms
->dp
;
134 vport
->port_no
= parms
->port_no
;
135 vport
->upcall_portid
= parms
->upcall_portid
;
137 INIT_HLIST_NODE(&vport
->dp_hash_node
);
139 vport
->percpu_stats
= alloc_percpu(struct pcpu_tstats
);
140 if (!vport
->percpu_stats
) {
142 return ERR_PTR(-ENOMEM
);
145 spin_lock_init(&vport
->stats_lock
);
151 * ovs_vport_free - uninitialize and free vport
153 * @vport: vport to free
155 * Frees a vport allocated with ovs_vport_alloc() when it is no longer needed.
157 * The caller must ensure that an RCU grace period has passed since the last
158 * time @vport was in a datapath.
160 void ovs_vport_free(struct vport
*vport
)
162 free_percpu(vport
->percpu_stats
);
167 * ovs_vport_add - add vport device (for kernel callers)
169 * @parms: Information about new vport.
171 * Creates a new vport with the specified configuration (which is dependent on
172 * device type). ovs_mutex must be held.
174 struct vport
*ovs_vport_add(const struct vport_parms
*parms
)
180 for (i
= 0; i
< ARRAY_SIZE(vport_ops_list
); i
++) {
181 if (vport_ops_list
[i
]->type
== parms
->type
) {
182 struct hlist_head
*bucket
;
184 vport
= vport_ops_list
[i
]->create(parms
);
186 err
= PTR_ERR(vport
);
190 bucket
= hash_bucket(ovs_dp_get_net(vport
->dp
),
191 vport
->ops
->get_name(vport
));
192 hlist_add_head_rcu(&vport
->hash_node
, bucket
);
204 * ovs_vport_set_options - modify existing vport device (for kernel callers)
206 * @vport: vport to modify.
207 * @options: New configuration.
209 * Modifies an existing device with the specified configuration (which is
210 * dependent on device type). ovs_mutex must be held.
212 int ovs_vport_set_options(struct vport
*vport
, struct nlattr
*options
)
214 if (!vport
->ops
->set_options
)
216 return vport
->ops
->set_options(vport
, options
);
220 * ovs_vport_del - delete existing vport device
222 * @vport: vport to delete.
224 * Detaches @vport from its datapath and destroys it. It is possible to fail
225 * for reasons such as lack of memory. ovs_mutex must be held.
227 void ovs_vport_del(struct vport
*vport
)
231 hlist_del_rcu(&vport
->hash_node
);
232 vport
->ops
->destroy(vport
);
236 * ovs_vport_set_stats - sets offset device stats
238 * @vport: vport on which to set stats
239 * @stats: stats to set
241 * Provides a set of transmit, receive, and error stats to be added as an
242 * offset to the collected data when stats are retrieved. Some devices may not
243 * support setting the stats, in which case the result will always be
246 * Must be called with ovs_mutex.
248 void ovs_vport_set_stats(struct vport
*vport
, struct ovs_vport_stats
*stats
)
250 spin_lock_bh(&vport
->stats_lock
);
251 vport
->offset_stats
= *stats
;
252 spin_unlock_bh(&vport
->stats_lock
);
256 * ovs_vport_get_stats - retrieve device stats
258 * @vport: vport from which to retrieve the stats
259 * @stats: location to store stats
261 * Retrieves transmit, receive, and error stats for the given device.
263 * Must be called with ovs_mutex or rcu_read_lock.
265 void ovs_vport_get_stats(struct vport
*vport
, struct ovs_vport_stats
*stats
)
269 /* We potentially have 3 sources of stats that need to be
270 * combined: those we have collected (split into err_stats and
271 * percpu_stats), offset_stats from set_stats(), and device
272 * error stats from netdev->get_stats() (for errors that happen
273 * downstream and therefore aren't reported through our
274 * vport_record_error() function).
275 * Stats from first two sources are merged and reported by ovs over
276 * OVS_VPORT_ATTR_STATS.
277 * netdev-stats can be directly read over netlink-ioctl.
280 spin_lock_bh(&vport
->stats_lock
);
282 *stats
= vport
->offset_stats
;
284 stats
->rx_errors
+= vport
->err_stats
.rx_errors
;
285 stats
->tx_errors
+= vport
->err_stats
.tx_errors
;
286 stats
->tx_dropped
+= vport
->err_stats
.tx_dropped
;
287 stats
->rx_dropped
+= vport
->err_stats
.rx_dropped
;
289 spin_unlock_bh(&vport
->stats_lock
);
291 for_each_possible_cpu(i
) {
292 const struct pcpu_tstats
*percpu_stats
;
293 struct pcpu_tstats local_stats
;
296 percpu_stats
= per_cpu_ptr(vport
->percpu_stats
, i
);
299 start
= u64_stats_fetch_begin_bh(&percpu_stats
->syncp
);
300 local_stats
= *percpu_stats
;
301 } while (u64_stats_fetch_retry_bh(&percpu_stats
->syncp
, start
));
303 stats
->rx_bytes
+= local_stats
.rx_bytes
;
304 stats
->rx_packets
+= local_stats
.rx_packets
;
305 stats
->tx_bytes
+= local_stats
.tx_bytes
;
306 stats
->tx_packets
+= local_stats
.tx_packets
;
311 * ovs_vport_get_options - retrieve device options
313 * @vport: vport from which to retrieve the options.
314 * @skb: sk_buff where options should be appended.
316 * Retrieves the configuration of the given device, appending an
317 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
318 * vport-specific attributes to @skb.
320 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
321 * negative error code if a real error occurred. If an error occurs, @skb is
324 * Must be called with ovs_mutex or rcu_read_lock.
326 int ovs_vport_get_options(const struct vport
*vport
, struct sk_buff
*skb
)
331 if (!vport
->ops
->get_options
)
334 nla
= nla_nest_start(skb
, OVS_VPORT_ATTR_OPTIONS
);
338 err
= vport
->ops
->get_options(vport
, skb
);
340 nla_nest_cancel(skb
, nla
);
344 nla_nest_end(skb
, nla
);
349 * ovs_vport_receive - pass up received packet to the datapath for processing
351 * @vport: vport that received the packet
352 * @skb: skb that was received
353 * @tun_key: tunnel (if any) that carried packet
355 * Must be called with rcu_read_lock. The packet cannot be shared and
356 * skb->data should point to the Ethernet header. The caller must have already
357 * called compute_ip_summed() to initialize the checksumming fields.
359 void ovs_vport_receive(struct vport
*vport
, struct sk_buff
*skb
,
360 struct ovs_key_ipv4_tunnel
*tun_key
)
362 struct pcpu_tstats
*stats
;
364 stats
= this_cpu_ptr(vport
->percpu_stats
);
365 u64_stats_update_begin(&stats
->syncp
);
367 stats
->rx_bytes
+= skb
->len
;
368 u64_stats_update_end(&stats
->syncp
);
370 OVS_CB(skb
)->tun_key
= tun_key
;
371 ovs_dp_process_received_packet(vport
, skb
);
375 * ovs_vport_send - send a packet on a device
377 * @vport: vport on which to send the packet
380 * Sends the given packet and returns the length of data sent. Either ovs
381 * lock or rcu_read_lock must be held.
383 int ovs_vport_send(struct vport
*vport
, struct sk_buff
*skb
)
385 int sent
= vport
->ops
->send(vport
, skb
);
387 if (likely(sent
> 0)) {
388 struct pcpu_tstats
*stats
;
390 stats
= this_cpu_ptr(vport
->percpu_stats
);
392 u64_stats_update_begin(&stats
->syncp
);
394 stats
->tx_bytes
+= sent
;
395 u64_stats_update_end(&stats
->syncp
);
396 } else if (sent
< 0) {
397 ovs_vport_record_error(vport
, VPORT_E_TX_ERROR
);
400 ovs_vport_record_error(vport
, VPORT_E_TX_DROPPED
);
406 * ovs_vport_record_error - indicate device error to generic stats layer
408 * @vport: vport that encountered the error
409 * @err_type: one of enum vport_err_type types to indicate the error type
411 * If using the vport generic stats layer indicate that an error of the given
414 void ovs_vport_record_error(struct vport
*vport
, enum vport_err_type err_type
)
416 spin_lock(&vport
->stats_lock
);
419 case VPORT_E_RX_DROPPED
:
420 vport
->err_stats
.rx_dropped
++;
423 case VPORT_E_RX_ERROR
:
424 vport
->err_stats
.rx_errors
++;
427 case VPORT_E_TX_DROPPED
:
428 vport
->err_stats
.tx_dropped
++;
431 case VPORT_E_TX_ERROR
:
432 vport
->err_stats
.tx_errors
++;
436 spin_unlock(&vport
->stats_lock
);
439 static void free_vport_rcu(struct rcu_head
*rcu
)
441 struct vport
*vport
= container_of(rcu
, struct vport
, rcu
);
443 ovs_vport_free(vport
);
446 void ovs_vport_deferred_free(struct vport
*vport
)
451 call_rcu(&vport
->rcu
, free_vport_rcu
);