diff options
| author | Oliver Hartkopp <socketcan@hartkopp.net> | 2022-09-12 19:07:21 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2022-09-15 09:08:08 +0200 |
| commit | 061834624c87282c6d9d8c5395aaff4380e5e1fc (patch) | |
| tree | 127af90c12a53abfe949aebd13847cee1dea3f2c /include/uapi/linux/can.h | |
| parent | 467ef4c7b9d1c22ee64342804bf92549d765df14 (diff) | |
can: set CANFD_FDF flag in all CAN FD frame structures
To simplify the testing in user space all struct canfd_frame's provided by
the CAN subsystem of the Linux kernel now have the CANFD_FDF flag set in
canfd_frame::flags.
NB: Handcrafted ETH_P_CANFD frames introduced via PF_PACKET socket might
not set this bit correctly. During the check for sufficient headroom in
PF_PACKET sk_buffs the uninitialized CAN sk_buff data structures are filled.
In the case of a CAN FD frame the CANFD_FDF flag is set accordingly.
As the CAN frame content is already zero initialized in alloc_canfd_skb()
the obsolete initialization of cf->flags in the CTU CAN FD driver has been
removed as it would overwrite the already set CANFD_FDF flag.
Acked-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/all/20220912170725.120748-4-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'include/uapi/linux/can.h')
| -rw-r--r-- | include/uapi/linux/can.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/uapi/linux/can.h b/include/uapi/linux/can.h index 90801ada2bbe..7b23eeeb3273 100644 --- a/include/uapi/linux/can.h +++ b/include/uapi/linux/can.h @@ -141,8 +141,8 @@ struct can_frame { * When this is done the former differentiation via CAN_MTU / CANFD_MTU gets * lost. CANFD_FDF allows programmers to mark CAN FD frames in the case of * using struct canfd_frame for mixed CAN / CAN FD content (dual use). - * N.B. the Kernel APIs do NOT provide mixed CAN / CAN FD content inside of - * struct canfd_frame therefore the CANFD_FDF flag is disregarded by Linux. + * Since the introduction of CAN XL the CANFD_FDF flag is set in all CAN FD + * frame structures provided by the CAN subsystem of the Linux kernel. */ #define CANFD_BRS 0x01 /* bit rate switch (second bitrate for payload data) */ #define CANFD_ESI 0x02 /* error state indicator of the transmitting node */ |