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can: at91_can: at91_alloc_can_err_skb() introduce new function

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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>
This commit is contained in:
Marc Kleine-Budde
2023-09-28 11:15:15 +02:00
parent 3db6154e44
commit dd94a2f1f2
1 changed files with 16 additions and 0 deletions
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16
drivers/net/can/at91_can.c
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@@ -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