Linux kernel stable tree (mirror) https://git.radix-linux.su/kernel/linux.git/atom?h=linux-7.0.y 2026-03-02T09:24:41+00:00 2026-03-02T09:24:41+00:00 Oliver Hartkopp socketcan@hartkopp.net 2026-01-26T10:45:40+00:00 urn:sha1:c77bfbdd6aac31b152ee81522cd90ad1de18738f The former implementation was only counting the tx_packets value but not the tx_bytes as the skb was dropped on driver layer. Enable CAN echo support (IFF_ECHO) in dummy_can_init(), which activates the code for setting and retrieving the echo SKB and counts the tx_bytes correctly. Fixes: 816cf430e84b ("can: add dummy_can driver") Cc: Vincent Mailhol <mailhol@kernel.org> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Reviewed-by: Vincent Mailhol <mailhol@kernel.org> Link: https://patch.msgid.link/20260126104540.21024-1-socketcan@hartkopp.net [mkl: make commit message imperative] Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> 2025-11-26T10:20:44+00:00 Vincent Mailhol mailhol@kernel.org 2025-11-26T10:16:16+00:00 urn:sha1:816cf430e84b4628dba665491e78ce081a468fcb During the development of CAN XL, we found the need of creating a dummy CAN XL driver in order to test the new netlink interface. While this code was initially intended to be some throwaway, it received some positive feedback. Add the dummy_can driver. This driver acts similarly to the vcan interface in the sense that it will echo back any packet it receives. The difference is that it exposes a set on bittiming parameters as a real device would and thus must be configured as if it was a real physical interface. The driver comes with a debug mode. If debug message are enabled (for example by enabling CONFIG_CAN_DEBUG_DEVICES), it will print in the kernel log all the bittiming values, similar to what a: ip --details link show can0 would do. This driver is mostly intended for debugging and testing, but some developers also may want to look at it as a simple reference implementation. Signed-off-by: Vincent Mailhol <mailhol@kernel.org> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Link: https://patch.msgid.link/20251126-canxl-v8-15-e7e3eb74f889@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>