can: flexcan: add ethtool support to get rx/tx ring parameters

2022-01-08T20:22:58Z

This patch adds ethtool support to get the number of message buffers configured for reception/transmission, which may also depends on runtime configurations such as the 'rx-rtr' flag state. Link: https://lore.kernel.org/all/20220108181633.420433-1-dario.binacchi@amarulasolutions.com Signed-off-by: Dario Binacchi [mkl: port to net-next/master, replace __sw_hweight64 by simpler calculation] Signed-off-by: Marc Kleine-Budde

can: flexcan: add ethtool support to change rx-rtr setting during runtime

2022-01-08T20:22:26Z

This patch adds a private flag to the flexcan driver to switch the "rx-rtr" setting on and off. "rx-rtr" on - Receive RTR frames. (default) The CAN controller can and will receive RTR frames. On some IP cores the controller cannot receive RTR frames in the more performant "RX mailbox" mode and will use "RX FIFO" mode instead. "rx-rtr" off - Waive ability to receive RTR frames. (not supported on all IP cores) This mode activates the "RX mailbox mode" for better performance, on some IP cores RTR frames cannot be received anymore. The "RX FIFO" mode uses a FIFO with a depth of 6 CAN frames. The "RX mailbox" mode uses up to 62 mailboxes. Link: https://lore.kernel.org/all/20220107193105.1699523-6-mkl@pengutronix.de Signed-off-by: Dario Binacchi Co-developed-by: Dario Binacchi Signed-off-by: Marc Kleine-Budde

linux-dev/drivers/net/can/flexcan/flexcan-ethtool.c, branch linus/master

can: flexcan: add ethtool support to get rx/tx ring parameters

can: flexcan: add ethtool support to change rx-rtr setting during runtime