diff options
| author | Vincent Mailhol <mailhol@kernel.org> | 2025-09-23 15:37:10 +0900 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2025-09-24 17:04:22 +0200 |
| commit | 23049938605bda390f875ce20e0704252c2e5c3d (patch) | |
| tree | a954b6e3aee37abc2085e3334e815cfd5386d73a /include/linux/can | |
| parent | 7c7da8aa3fd69b77e8efaa14b80bddd948547739 (diff) | |
can: populate the minimum and maximum MTU values
By populating:
net_device->min_mtu
and
net_device->max_mtu
the net core infrastructure will automatically:
1. validate that the user's inputs are in range.
2. report those min and max MTU values through the netlink
interface.
Add can_set_default_mtu() which sets the default mtu value as well as
the minimum and maximum values. The logic for the default mtu value
remains unchanged:
- CANFD_MTU if the device has a static CAN_CTRLMODE_FD.
- CAN_MTU otherwise.
Call can_set_default_mtu() each time the CAN_CTRLMODE_FD is modified.
This will guarantee that the MTU value is always consistent with the
control mode flags.
With this, the checks done in can_change_mtu() become fully redundant
and will be removed in an upcoming change and it is now possible to
confirm the minimum and maximum MTU values on a physical CAN interface
by doing:
$ ip --details link show can0
The virtual interfaces (vcan and vxcan) are not impacted by this
change.
Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Link: https://patch.msgid.link/20250923-can-fix-mtu-v3-3-581bde113f52@kernel.org
[mkl: squashed https://patch.msgid.link/20250924143644.17622-2-mailhol@kernel.org]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'include/linux/can')
| -rw-r--r-- | include/linux/can/dev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h index 5dc58360c2d7..3354f70ed2c6 100644 --- a/include/linux/can/dev.h +++ b/include/linux/can/dev.h @@ -166,6 +166,7 @@ struct can_priv *safe_candev_priv(struct net_device *dev); int open_candev(struct net_device *dev); void close_candev(struct net_device *dev); +void can_set_default_mtu(struct net_device *dev); int can_change_mtu(struct net_device *dev, int new_mtu); int __must_check can_set_static_ctrlmode(struct net_device *dev, u32 static_mode); |