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 | |