diff options
| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2023-09-28 11:15:15 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2023-10-05 21:47:39 +0200 |
| commit | dd94a2f1f2f848a2534c4b0115db752a55b7eb03 (patch) | |
| tree | 9dc0f5be26358c8520380e70e5413eaad50222b9 | |
| parent | 3db6154e44dba8626cd6e31e15bd29d1c3861ca8 (diff) | |
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>
| -rw-r--r-- | drivers/net/can/at91_can.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c index d5e1d1b2cdd1..ca62aa027e5f 100644 --- a/drivers/net/can/at91_can.c +++ b/drivers/net/can/at91_can.c @@ -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 |