Re: [PATCH v1 0/2] fix statistics for CAN RTR and Error frames

From: Vincent MAILHOL
Date: Tue Nov 23 2021 - 18:35:28 EST

On Wed. 24 Nov. 2021 at 06:10, Oliver Hartkopp <socketcan@xxxxxxxxxxxx> wrote:
> On 23.11.21 12:53, Vincent Mailhol wrote:
> > There are two common errors which are made when reporting the CAN RX
> > statistics:
> >
> > 1. Incrementing the "normal" RX stats when receiving an Error
> > frame. Error frames is an abstraction of Socket CAN and does not
> > exist on the wire.
> >
> > 2. Counting the length of the Remote Transmission Frames (RTR). The
> > length of an RTR frame is the length of the requested frame not the
> > actual payload. In reality the payload of an RTR frame is always 0
> > bytes long.
> >
> > This patch series fix those two issues for all CAN drivers.
> >
> > Vincent Mailhol (2):
> > can: do not increase rx statistics when receiving CAN error frames
> > can: do not increase rx_bytes statistics for RTR frames
> I would suggest to upstream this change without bringing it to older
> (stable) trees.
> It doesn't fix any substantial flaw which needs to be backported IMHO.

I fully agree. Bringing it to the stable trees would be a
considerable effort and was not my intent either (thus the
absence of "Fixes" tags).

> Btw. can you please change 'error frames' to 'error message frames'?
> We had a discussion some years ago that the 'error frames' are used as
> term inside the CAN protocol.

ACK. Thanks for the clarification on the vocabulary.

Yours sincerely,
Vincent Mailhol