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1 | /* |
2 | * Copyright (c) 2019 Ilya Maximets <i.maximets@ovn.org>. | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | #include "openvswitch/compiler.h" | |
19 | #include "openvswitch/thread.h" | |
20 | #include "openvswitch/util.h" | |
21 | #include "if-notifier.h" | |
22 | ||
23 | /* Implementation of a manual interface notifier. | |
24 | * | |
25 | * Intended for catching interface events that could not be tracked by | |
26 | * OS specific interface notifiers, e.g. iface updates in netdev-dpdk. | |
27 | * For that purpose 'if_notifier_manual_report()' should be called directly | |
28 | * by the code that aware of interface changes. | |
29 | * | |
30 | * Thread-safety | |
31 | * ============= | |
32 | * This notifier is thread-safe in terms of calling its functions from | |
33 | * different thread contexts, however if the callback passed to | |
34 | * 'if_notifier_manual_set_cb' is used by some other code (i.e. by OS | |
35 | * specific notifiers) it must be thread-safe itself. | |
36 | */ | |
37 | ||
38 | static struct ovs_mutex manual_notifier_mutex = OVS_MUTEX_INITIALIZER; | |
39 | static if_notify_func *notify OVS_GUARDED_BY(manual_notifier_mutex) = NULL; | |
40 | ||
41 | void | |
42 | if_notifier_manual_set_cb(if_notify_func *cb) | |
43 | { | |
44 | ovs_mutex_lock(&manual_notifier_mutex); | |
45 | notify = cb; | |
46 | ovs_mutex_unlock(&manual_notifier_mutex); | |
47 | } | |
48 | ||
49 | void | |
50 | if_notifier_manual_report(void) | |
51 | { | |
52 | ovs_mutex_lock(&manual_notifier_mutex); | |
53 | if (notify) { | |
54 | notify(NULL); | |
55 | } | |
56 | ovs_mutex_unlock(&manual_notifier_mutex); | |
57 | } |