Re: [PATCH net 1/6] net: stmmac: selftests: Check multiple MMC counters

[Andrew Lunn <andrew@lunn.ch>]

On Wed, Aug 26, 2026 at 04:04:53PM +0200, Maxime Chevallier wrote:
> The MMC counters report MAC statistics. Multiple counters can be
> enabled when the IP is integrated, however there's no way to know
> exactly which ones. Un-implemented counters seem to report 0.
> 
> It was found that on StarFive JH7110 and Amlogic SM1, the counter that's
> used by the selftest (mmc_tx_framecount_g) isn't implemented, triggering
> an MMC selftest failure.
> 
> Both the above SoCs seem to implement mmc_rx_framecount_gb, let's use
> this counter as well for MMC counter validation.
> 
> Note that this doesn't guarantee that we won't encounter the same issue
> again if another IP implements yet another set of counters that don't
> include that new one.
> 
> If the game of whack-a-mole with implemented counters becomes too hard to
> maintain, we may simply consider removing the MMC selftest entirely.
> 
> Fixes: 091810dbded9 ("net: stmmac: Introduce selftests support")
> Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>

Seems sensible.

If more moles need whacking, we could consider the value of 0 as
success.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew