Commit dd94a2f1 authored Sep 28, 2023 by Marc Kleine-Budde

can: at91_can: at91_alloc_can_err_skb() introduce new function

This is a preparation patch to convert the driver to make use of the
rx-offload helper. With rx-offload the received CAN frames are sorted
by their timestamp. Regular CAN RX'ed and TX'ed CAN frames are
timestamped by the hardware. Error events are not.

Introduce a new function at91_alloc_can_err_skb() the allocates an
error SKB and reads the current timestamp from the controller.

Link: https://lore.kernel.org/all/20231005-at91_can-rx_offload-v2-26-9987d53600e0@pengutronix.de

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

parent 3db6154e

drivers/net/can/at91_can.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -576,6 +576,22 @@ static inline void at91_activate_rx_mb(const struct at91_priv *priv,
		at91_write(priv, AT91_TCR, mask);
		}

		static inline u32 at91_get_timestamp(const struct at91_priv *priv)
		{
		return at91_read(priv, AT91_TIM);
		}

		static inline struct sk_buff *
		at91_alloc_can_err_skb(struct net_device *dev,
		struct can_frame *cf, u32 timestamp)
		{
		const struct at91_priv *priv = netdev_priv(dev);

		*timestamp = at91_get_timestamp(priv);

		return alloc_can_err_skb(dev, cf);
		}

		/**
		* at91_rx_overflow_err - send error frame due to rx overflow
		* @dev: net device