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SubjectRe: [PATCH 3/3] can: esd_usb: Improved decoding for ESD_EV_CAN_ERROR_EXT messages
Le mar. 20 déc. 2022 à 06:28, Frank Jungclaus <frank.jungclaus@esd.eu> a écrit :
>
> As suggested by Marc there now is a union plus a struct ev_can_err_ext
> for easier decoding of an ESD_EV_CAN_ERROR_EXT event message (which
> simply is a rx_msg with some dedicated data).
>
> Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de>
> Link: https://lore.kernel.org/linux-can/20220621071152.ggyhrr5sbzvwpkpx@pengutronix.de/
> Signed-off-by: Frank Jungclaus <frank.jungclaus@esd.eu>
> ---
> drivers/net/can/usb/esd_usb.c | 18 +++++++++++++-----
> 1 file changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/can/usb/esd_usb.c b/drivers/net/can/usb/esd_usb.c
> index 09745751f168..f90bb2c0ba15 100644
> --- a/drivers/net/can/usb/esd_usb.c
> +++ b/drivers/net/can/usb/esd_usb.c
> @@ -127,7 +127,15 @@ struct rx_msg {
> u8 dlc;
> __le32 ts;
> __le32 id; /* upper 3 bits contain flags */
> - u8 data[8];
> + union {
> + u8 data[8];
> + struct {
> + u8 status; /* CAN Controller Status */
> + u8 ecc; /* Error Capture Register */
> + u8 rec; /* RX Error Counter */
> + u8 tec; /* TX Error Counter */
> + } ev_can_err_ext; /* For ESD_EV_CAN_ERROR_EXT */
> + };
> };
>
> struct tx_msg {
> @@ -229,10 +237,10 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
> u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
>
> if (id == ESD_EV_CAN_ERROR_EXT) {
> - u8 state = msg->msg.rx.data[0];
> - u8 ecc = msg->msg.rx.data[1];
> - u8 rxerr = msg->msg.rx.data[2];
> - u8 txerr = msg->msg.rx.data[3];
> + u8 state = msg->msg.rx.ev_can_err_ext.status;
> + u8 ecc = msg->msg.rx.ev_can_err_ext.ecc;
> + u8 rxerr = msg->msg.rx.ev_can_err_ext.rec;
> + u8 txerr = msg->msg.rx.ev_can_err_ext.tec;

I do not like how you have to write msg->msg.rx.something. I think it
would be better to make the union within struct esd_usb_msg anonymous:

https://elixir.bootlin.com/linux/latest/source/drivers/net/can/usb/esd_usb.c#L169

That said, this is not a criticism of this patch but more something to
be addressed in a separate clean-up patch.

> netdev_dbg(priv->netdev,
> "CAN_ERR_EV_EXT: dlc=%#02x state=%02x ecc=%02x rec=%02x tec=%02x\n",
> --
> 2.25.1
>

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