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383f0993fc
Currently, the CAN netlink interface provides no easy ways to check the capabilities of a given controller. The only method from the command line is to try each CAN_CTRLMODE_* individually to check whether the netlink interface returns an -EOPNOTSUPP error or not (alternatively, one may find it easier to directly check the source code of the driver instead...) This patch introduces a method for the user to check both the supported and the static capabilities. The proposed method introduces a new IFLA nest: IFLA_CAN_CTRLMODE_EXT which extends the current IFLA_CAN_CTRLMODE. This is done to guaranty a full forward and backward compatibility between the kernel and the user land applications. The IFLA_CAN_CTRLMODE_EXT nest contains one single entry: IFLA_CAN_CTRLMODE_SUPPORTED. Because this entry is only used in one direction: kernel to userland, no new struct nla_policy are introduced. Below table explains how IFLA_CAN_CTRLMODE_SUPPORTED (hereafter: "supported") and can_ctrlmode::flags (hereafter: "flags") allow us to identify both the supported and the static capabilities, when masked with any of the CAN_CTRLMODE_* bit flags: supported & flags & Controller capabilities CAN_CTRLMODE_* CAN_CTRLMODE_* ----------------------------------------------------------------------- false false Feature not supported (always disabled) false true Static feature (always enabled) true false Feature supported but disabled true true Feature supported and enabled Link: https://lore.kernel.org/all/20211213160226.56219-5-mailhol.vincent@wanadoo.fr Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> |
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| .. | ||
| c_can | ||
| cc770 | ||
| dev | ||
| ifi_canfd | ||
| m_can | ||
| mscan | ||
| peak_canfd | ||
| rcar | ||
| sja1000 | ||
| softing | ||
| spi | ||
| usb | ||
| at91_can.c | ||
| flexcan.c | ||
| grcan.c | ||
| janz-ican3.c | ||
| Kconfig | ||
| kvaser_pciefd.c | ||
| led.c | ||
| Makefile | ||
| pch_can.c | ||
| slcan.c | ||
| sun4i_can.c | ||
| ti_hecc.c | ||
| vcan.c | ||
| vxcan.c | ||
| xilinx_can.c | ||