From 137f59d5dab4bd55ab3d40080de18bf641bdc26a Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Sun, 10 May 2015 17:25:14 +0200 Subject: can: at91_can: switch to rx-offload implementation The current at91_can driver uses NAPI to handle RX'ed CAN frames, the RX IRQ is disabled and a NAPI poll is scheduled. Then in at91_poll_rx() the RX'ed CAN frames are tried to read in order from the device. This approach has 2 drawbacks: - Under high system load it might take too long from the initial RX IRQ to the NAPI poll function to run. This causes RX buffer overflows. - The algorithm to read the CAN frames in order is not bullet proof and may fail under certain use cases/system loads. The rx-offload helper fixes these problems by reading the RX'ed CAN frames in the interrupt handler and adding it to a list sorted by RX timestamp. This list of RX'ed SKBs is then passed to the networking stack via NAPI. Convert the RX path to rx-offload, pass all CAN error frames with can_rx_offload_queue_timestamp(). Link: https://lore.kernel.org/all/20231005-at91_can-rx_offload-v2-27-9987d53600e0@pengutronix.de Signed-off-by: Marc Kleine-Budde --- drivers/net/can/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/net/can/Kconfig') diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig index 649453a3c858..8d6fc0852bf7 100644 --- a/drivers/net/can/Kconfig +++ b/drivers/net/can/Kconfig @@ -89,6 +89,7 @@ config CAN_RX_OFFLOAD config CAN_AT91 tristate "Atmel AT91 onchip CAN controller" depends on (ARCH_AT91 || COMPILE_TEST) && HAS_IOMEM + select CAN_RX_OFFLOAD help This is a driver for the SoC CAN controller in Atmel's AT91SAM9263 and AT91SAM9X5 processors. -- cgit