netdev - Re: [PATCH net-next v11 5/6] net: dsa: mv88e6xxx: rmon: Use RMU for reading RMON data

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Message-ID: <YyHoXUyBIMyFGZTX@lunn.ch>
Date:   Wed, 14 Sep 2022 16:42:37 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Mattias Forsblad <mattias.forsblad@...il.com>
Cc:     netdev@...r.kernel.org, Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux@...linux.org.uk
Subject: Re: [PATCH net-next v11 5/6] net: dsa: mv88e6xxx: rmon: Use RMU for
 reading RMON data

> @@ -1234,16 +1234,30 @@ static int mv88e6xxx_stats_get_stats(struct mv88e6xxx_chip *chip, int port,
>  				     u16 bank1_select, u16 histogram)
>  {
>  	struct mv88e6xxx_hw_stat *stat;
> +	int offset = 0;
> +	u64 high;
>  	int i, j;
>  
>  	for (i = 0, j = 0; i < ARRAY_SIZE(mv88e6xxx_hw_stats); i++) {
>  		stat = &mv88e6xxx_hw_stats[i];
>  		if (stat->type & types) {
> -			mv88e6xxx_reg_lock(chip);
> -			data[j] = _mv88e6xxx_get_ethtool_stat(chip, stat, port,
> -							      bank1_select,
> -							      histogram);
> -			mv88e6xxx_reg_unlock(chip);
> +			if (mv88e6xxx_rmu_available(chip) &&
> +			    !(stat->type & STATS_TYPE_PORT)) {

If i understand you comment to a previous version, the problem here is
STATS_TYPE_PORT. You are falling back to MDIO for those three
statistics. The data sheet for the 6352 shows these statistics are
available at offset 129 and above in the RMU reply.

I looked through the datasheets i have. I don't have a full set, but
all that i have which include the RMU have these statistics at offset
129.

So i think you can remove the fallback to MDIO. That should then allow
you to have a fully independent implementation, making it much
cleaner.

Or do you see other problems i currently don't?

    Andrew