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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 <mkl@pengutronix.de> |
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| .. | ||
| c_can | ||
| cc770 | ||
| ctucanfd | ||
| dev | ||
| flexcan | ||
| ifi_canfd | ||
| m_can | ||
| mscan | ||
| peak_canfd | ||
| rcar | ||
| sja1000 | ||
| slcan | ||
| softing | ||
| spi | ||
| usb | ||
| at91_can.c | ||
| bxcan.c | ||
| can327.c | ||
| grcan.c | ||
| janz-ican3.c | ||
| Kconfig | ||
| kvaser_pciefd.c | ||
| Makefile | ||
| sun4i_can.c | ||
| ti_hecc.c | ||
| vcan.c | ||
| vxcan.c | ||
| xilinx_can.c | ||