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/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>
30 #include <net/net_namespace.h>
34 #include "vport-internal_dev.h"
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
,
42 #ifdef CONFIG_OPENVSWITCH_GRE
47 /* Protected by RCU read lock for reading, ovs_mutex for writing. */
48 static struct hlist_head
*dev_table
;
49 #define VPORT_HASH_BUCKETS 1024
52 * ovs_vport_init - initialize vport subsystem
54 * Called at module load time to initialize the vport subsystem.
56 int ovs_vport_init(void)
58 dev_table
= kzalloc(VPORT_HASH_BUCKETS
* sizeof(struct hlist_head
),
67 * ovs_vport_exit - shutdown vport subsystem
69 * Called at module exit time to shutdown the vport subsystem.
71 void ovs_vport_exit(void)
76 static struct hlist_head
*hash_bucket(struct net
*net
, const char *name
)
78 unsigned int hash
= jhash(name
, strlen(name
), (unsigned long) net
);
79 return &dev_table
[hash
& (VPORT_HASH_BUCKETS
- 1)];
83 * ovs_vport_locate - find a port that has already been created
85 * @name: name of port to find
87 * Must be called with ovs or RCU read lock.
89 struct vport
*ovs_vport_locate(struct net
*net
, const char *name
)
91 struct hlist_head
*bucket
= hash_bucket(net
, name
);
94 hlist_for_each_entry_rcu(vport
, bucket
, hash_node
)
95 if (!strcmp(name
, vport
->ops
->get_name(vport
)) &&
96 net_eq(ovs_dp_get_net(vport
->dp
), net
))
103 * ovs_vport_alloc - allocate and initialize new vport
105 * @priv_size: Size of private data area to allocate.
106 * @ops: vport device ops
108 * Allocate and initialize a new vport defined by @ops. The vport will contain
109 * a private data area of size @priv_size that can be accessed using
110 * vport_priv(). vports that are no longer needed should be released with
113 struct vport
*ovs_vport_alloc(int priv_size
, const struct vport_ops
*ops
,
114 const struct vport_parms
*parms
)
119 alloc_size
= sizeof(struct vport
);
121 alloc_size
= ALIGN(alloc_size
, VPORT_ALIGN
);
122 alloc_size
+= priv_size
;
125 vport
= kzalloc(alloc_size
, GFP_KERNEL
);
127 return ERR_PTR(-ENOMEM
);
129 vport
->dp
= parms
->dp
;
130 vport
->port_no
= parms
->port_no
;
131 vport
->upcall_portid
= parms
->upcall_portid
;
133 INIT_HLIST_NODE(&vport
->dp_hash_node
);
135 vport
->percpu_stats
= alloc_percpu(struct pcpu_tstats
);
136 if (!vport
->percpu_stats
) {
138 return ERR_PTR(-ENOMEM
);
141 spin_lock_init(&vport
->stats_lock
);
147 * ovs_vport_free - uninitialize and free vport
149 * @vport: vport to free
151 * Frees a vport allocated with vport_alloc() when it is no longer needed.
153 * The caller must ensure that an RCU grace period has passed since the last
154 * time @vport was in a datapath.
156 void ovs_vport_free(struct vport
*vport
)
158 free_percpu(vport
->percpu_stats
);
163 * ovs_vport_add - add vport device (for kernel callers)
165 * @parms: Information about new vport.
167 * Creates a new vport with the specified configuration (which is dependent on
168 * device type). ovs_mutex must be held.
170 struct vport
*ovs_vport_add(const struct vport_parms
*parms
)
176 for (i
= 0; i
< ARRAY_SIZE(vport_ops_list
); i
++) {
177 if (vport_ops_list
[i
]->type
== parms
->type
) {
178 struct hlist_head
*bucket
;
180 vport
= vport_ops_list
[i
]->create(parms
);
182 err
= PTR_ERR(vport
);
186 bucket
= hash_bucket(ovs_dp_get_net(vport
->dp
),
187 vport
->ops
->get_name(vport
));
188 hlist_add_head_rcu(&vport
->hash_node
, bucket
);
200 * ovs_vport_set_options - modify existing vport device (for kernel callers)
202 * @vport: vport to modify.
203 * @port: New configuration.
205 * Modifies an existing device with the specified configuration (which is
206 * dependent on device type). ovs_mutex must be held.
208 int ovs_vport_set_options(struct vport
*vport
, struct nlattr
*options
)
210 if (!vport
->ops
->set_options
)
212 return vport
->ops
->set_options(vport
, options
);
216 * ovs_vport_del - delete existing vport device
218 * @vport: vport to delete.
220 * Detaches @vport from its datapath and destroys it. It is possible to fail
221 * for reasons such as lack of memory. ovs_mutex must be held.
223 void ovs_vport_del(struct vport
*vport
)
227 hlist_del_rcu(&vport
->hash_node
);
229 vport
->ops
->destroy(vport
);
233 * ovs_vport_get_stats - retrieve device stats
235 * @vport: vport from which to retrieve the stats
236 * @stats: location to store stats
238 * Retrieves transmit, receive, and error stats for the given device.
240 * Must be called with ovs_mutex or rcu_read_lock.
242 void ovs_vport_get_stats(struct vport
*vport
, struct ovs_vport_stats
*stats
)
246 memset(stats
, 0, sizeof(*stats
));
248 /* We potentially have 2 sources of stats that need to be combined:
249 * those we have collected (split into err_stats and percpu_stats) from
250 * set_stats() and device error stats from netdev->get_stats() (for
251 * errors that happen downstream and therefore aren't reported through
252 * our vport_record_error() function).
253 * Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
254 * netdev-stats can be directly read over netlink-ioctl.
257 spin_lock_bh(&vport
->stats_lock
);
259 stats
->rx_errors
= vport
->err_stats
.rx_errors
;
260 stats
->tx_errors
= vport
->err_stats
.tx_errors
;
261 stats
->tx_dropped
= vport
->err_stats
.tx_dropped
;
262 stats
->rx_dropped
= vport
->err_stats
.rx_dropped
;
264 spin_unlock_bh(&vport
->stats_lock
);
266 for_each_possible_cpu(i
) {
267 const struct pcpu_tstats
*percpu_stats
;
268 struct pcpu_tstats local_stats
;
271 percpu_stats
= per_cpu_ptr(vport
->percpu_stats
, i
);
274 start
= u64_stats_fetch_begin_bh(&percpu_stats
->syncp
);
275 local_stats
= *percpu_stats
;
276 } while (u64_stats_fetch_retry_bh(&percpu_stats
->syncp
, start
));
278 stats
->rx_bytes
+= local_stats
.rx_bytes
;
279 stats
->rx_packets
+= local_stats
.rx_packets
;
280 stats
->tx_bytes
+= local_stats
.tx_bytes
;
281 stats
->tx_packets
+= local_stats
.tx_packets
;
286 * ovs_vport_get_options - retrieve device options
288 * @vport: vport from which to retrieve the options.
289 * @skb: sk_buff where options should be appended.
291 * Retrieves the configuration of the given device, appending an
292 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
293 * vport-specific attributes to @skb.
295 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
296 * negative error code if a real error occurred. If an error occurs, @skb is
299 * Must be called with ovs_mutex or rcu_read_lock.
301 int ovs_vport_get_options(const struct vport
*vport
, struct sk_buff
*skb
)
306 if (!vport
->ops
->get_options
)
309 nla
= nla_nest_start(skb
, OVS_VPORT_ATTR_OPTIONS
);
313 err
= vport
->ops
->get_options(vport
, skb
);
315 nla_nest_cancel(skb
, nla
);
319 nla_nest_end(skb
, nla
);
324 * ovs_vport_receive - pass up received packet to the datapath for processing
326 * @vport: vport that received the packet
327 * @skb: skb that was received
329 * Must be called with rcu_read_lock. The packet cannot be shared and
330 * skb->data should point to the Ethernet header.
332 void ovs_vport_receive(struct vport
*vport
, struct sk_buff
*skb
,
333 struct ovs_key_ipv4_tunnel
*tun_key
)
335 struct pcpu_tstats
*stats
;
337 stats
= this_cpu_ptr(vport
->percpu_stats
);
338 u64_stats_update_begin(&stats
->syncp
);
340 stats
->rx_bytes
+= skb
->len
;
341 u64_stats_update_end(&stats
->syncp
);
343 OVS_CB(skb
)->tun_key
= tun_key
;
344 ovs_dp_process_received_packet(vport
, skb
);
348 * ovs_vport_send - send a packet on a device
350 * @vport: vport on which to send the packet
353 * Sends the given packet and returns the length of data sent. Either ovs
354 * lock or rcu_read_lock must be held.
356 int ovs_vport_send(struct vport
*vport
, struct sk_buff
*skb
)
358 int sent
= vport
->ops
->send(vport
, skb
);
360 if (likely(sent
> 0)) {
361 struct pcpu_tstats
*stats
;
363 stats
= this_cpu_ptr(vport
->percpu_stats
);
365 u64_stats_update_begin(&stats
->syncp
);
367 stats
->tx_bytes
+= sent
;
368 u64_stats_update_end(&stats
->syncp
);
369 } else if (sent
< 0) {
370 ovs_vport_record_error(vport
, VPORT_E_TX_ERROR
);
373 ovs_vport_record_error(vport
, VPORT_E_TX_DROPPED
);
379 * ovs_vport_record_error - indicate device error to generic stats layer
381 * @vport: vport that encountered the error
382 * @err_type: one of enum vport_err_type types to indicate the error type
384 * If using the vport generic stats layer indicate that an error of the given
387 void ovs_vport_record_error(struct vport
*vport
, enum vport_err_type err_type
)
389 spin_lock(&vport
->stats_lock
);
392 case VPORT_E_RX_DROPPED
:
393 vport
->err_stats
.rx_dropped
++;
396 case VPORT_E_RX_ERROR
:
397 vport
->err_stats
.rx_errors
++;
400 case VPORT_E_TX_DROPPED
:
401 vport
->err_stats
.tx_dropped
++;
404 case VPORT_E_TX_ERROR
:
405 vport
->err_stats
.tx_errors
++;
409 spin_unlock(&vport
->stats_lock
);
412 static void free_vport_rcu(struct rcu_head
*rcu
)
414 struct vport
*vport
= container_of(rcu
, struct vport
, rcu
);
416 ovs_vport_free(vport
);
419 void ovs_vport_deferred_free(struct vport
*vport
)
424 call_rcu(&vport
->rcu
, free_vport_rcu
);
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