Re: [PATCH v2 4/5] can: do not increase rx_bytes statistics for RTR frames

[Oliver Hartkopp <socketcan@xxxxxxxxxxxx>]

Hi Vincent,

On 25.11.21 18:20, Vincent Mailhol wrote:

> diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c
> index d582c39fc8d0..717d4925fdb0 100644
> --- a/drivers/net/can/usb/ucan.c
> +++ b/drivers/net/can/usb/ucan.c
> @@ -619,12 +619,13 @@ static void ucan_rx_can_msg(struct ucan_priv *up, struct ucan_message_in *m)
>   	/* copy the payload of non RTR frames */
>   	if (!(cf->can_id & CAN_RTR_FLAG) || (cf->can_id & CAN_ERR_FLAG))
>   		memcpy(cf->data, m->msg.can_msg.data, cf->len);
> +	/* only frames which are neither RTR nor ERR have a payload */
> +	else
> +		stats->rx_bytes += cf->len;

This 'else' path looks wrong ...

>   
>   	/* don't count error frames as real packets */
> -	if (!(cf->can_id & CAN_ERR_FLAG)) {
> +	if (!(cf->can_id & CAN_ERR_FLAG))
>   		stats->rx_packets++;
> -		stats->rx_bytes += cf->len;
> -	}
>   
>   	/* pass it to Linux */
>   	netif_rx(skb);

Regards,
Oliver