1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * include/net/dsa_stubs.h - Stubs for the Distributed Switch Architecture framework
4 */
5
6 #include <linux/mutex.h>
7 #include <linux/netdevice.h>
8 #include <linux/net_tstamp.h>
9 #include <net/dsa.h>
10
11 #if IS_ENABLED(CONFIG_NET_DSA)
12
13 extern const struct dsa_stubs *dsa_stubs;
14
15 struct dsa_stubs {
16 int (*conduit_hwtstamp_validate)(struct net_device *dev,
17 const struct kernel_hwtstamp_config *config,
18 struct netlink_ext_ack *extack);
19 };
20
21 static inline int dsa_conduit_hwtstamp_validate(struct net_device *dev,
22 const struct kernel_hwtstamp_config *config,
23 struct netlink_ext_ack *extack)
24 {
25 if (!netdev_uses_dsa(dev))
26 return 0;
27
28 /* rtnl_lock() is a sufficient guarantee, because as long as
29 * netdev_uses_dsa() returns true, the dsa_core module is still
30 * registered, and so, dsa_unregister_stubs() couldn't have run.
31 * For netdev_uses_dsa() to start returning false, it would imply that
32 * dsa_conduit_teardown() has executed, which requires rtnl_lock().
33 */
34 ASSERT_RTNL();
35
36 return dsa_stubs->conduit_hwtstamp_validate(dev, config, extack);
37 }
38
39 #else
40
41 static inline int dsa_conduit_hwtstamp_validate(struct net_device *dev,
42 const struct kernel_hwtstamp_config *config,
43 struct netlink_ext_ack *extack)
44 {
45 return 0;
46 }
47
48 #endif
49
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