netdev - Re: [PATCH net-next] net: phy: Maintain MDIO device and bus statistics

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Date:   Sun, 12 Jan 2020 20:55:46 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     cphealy@...il.com, rmk+kernel@...linux.org.uk, kuba@...nel.org,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: phy: Maintain MDIO device and bus
 statistics



On 1/12/2020 8:53 PM, Florian Fainelli wrote:
> Maintain per MDIO device and MDIO bus statistics comprised of the number
> of transfers/operations, reads and writes and errors. This is useful for
> tracking the per-device and global MDIO bus bandwidth and doing
> optimizations as necessary.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---

[snip]

> +#define MDIO_BUS_STATS_SHOW_NAME(name, file, field, format_string)	\
> +static ssize_t mdio_bus_stats_##name##_show(struct mdio_bus_stats *s,	\
> +					    char *buf)			\
> +{									\
> +	unsigned int start;						\
> +	ssize_t len;							\
> +	u64 tmp;							\
> +	do {								\
> +		start = u64_stats_fetch_begin(&s->syncp);		\
> +		tmp = u64_stats_read(&s->field);			\
> +	} while (u64_stats_fetch_retry(&s->syncp, start));		\
> +	len = sprintf(buf, format_string ## "\n", tmp);			\

	^ ===== that hunk right there does not build, I sent a non-fixed up
patch, I would still appreciate comments though.
-- 
Florian