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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 <dario.binacchi@amarulasolutions.com> [mkl: port to net-next/master, replace __sw_hweight64 by simpler calculation] Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>