Re: [PATCH net-next 1/4] net: dsa: motorcomm: Fix stats64 error counter mapping

[Andrew Lunn <andrew@lunn.ch>]

> [Severity: Medium]
> With the tx_fifo_errors mapping removed, TX undersize events are no
> longer counted in any rtnl_link_stats64 field, and that includes
> tx_errors. Is this intended?
> 
> The tx_errors kernel-doc in include/uapi/linux/if_link.h says:
> 
>  * @tx_errors: Total number of transmit problems.
>  *   This counter must include events counter by @tx_aborted_errors,
>  *   @tx_carrier_errors, @tx_fifo_errors, @tx_heartbeat_errors,
>  *   @tx_window_errors and other errors not otherwise counted.
> 
> A runt frame may not be a FIFO underrun. Could tx_undersize_errors still
> be added to tx_errors as an error not otherwise counted?

It should not be possible to send runt frame, i expect either the
hardware, or the driver to pad them to 64 bytes. So i don't think what
the LLM is saying is valid.

However, it would be good to get this counter reported somewhere.

	 Andrew