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Message-ID: <20231204161823.eyac4mwjakizygmz@skbuf>
Date: Mon, 4 Dec 2023 18:18:23 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Tobias Waldekranz <tobias@...dekranz.com>
Cc: davem@...emloft.net, kuba@...nel.org, andrew@...n.ch,
f.fainelli@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] net: dsa: mv88e6xxx: Create API to read a
single stat counter
On Fri, Dec 01, 2023 at 01:58:09PM +0100, Tobias Waldekranz wrote:
> This change contains no functional change. We simply push the hardware
> specific stats logic to a function reading a single counter, rather
> than the whole set.
>
> This is a preparatory change for the upcoming standard ethtool
> statistics support (i.e. "eth-mac", "eth-ctrl" etc.).
>
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
> ---
I think I like this patch set. Some nitpicks below.
> -static int mv88e6320_stats_get_stats(struct mv88e6xxx_chip *chip, int port,
> - uint64_t *data)
> +static int mv88e6xxx_stats_get_stat(struct mv88e6xxx_chip *chip, int port,
> + const struct mv88e6xxx_hw_stat *stat,
> + uint64_t *data)
> {
> - return mv88e6xxx_stats_get_stats(chip, port, data,
> - STATS_TYPE_BANK0 | STATS_TYPE_BANK1,
> - MV88E6XXX_G1_STATS_OP_BANK_1_BIT_9,
> - MV88E6XXX_G1_STATS_OP_HIST_RX_TX);
> + int ret = 0;
> +
> + if (chip->info->ops->stats_get_stat) {
> + mv88e6xxx_reg_lock(chip);
> + ret = chip->info->ops->stats_get_stat(chip, port, stat, data);
> + mv88e6xxx_reg_unlock(chip);
> + }
There is no chip->info->ops which does not provide stats_get_stat().
As a separate change, I suppose you could drop the "if".
> +
> + return ret;
> }
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
> index 44383a03ef2f..b0dfbcae0be9 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.h
> +++ b/drivers/net/dsa/mv88e6xxx/chip.h
> @@ -574,8 +585,9 @@ struct mv88e6xxx_ops {
> /* Return the number of strings describing statistics */
> int (*stats_get_sset_count)(struct mv88e6xxx_chip *chip);
> int (*stats_get_strings)(struct mv88e6xxx_chip *chip, uint8_t *data);
> - int (*stats_get_stats)(struct mv88e6xxx_chip *chip, int port,
> - uint64_t *data);
> + int (*stats_get_stat)(struct mv88e6xxx_chip *chip, int port,
> + const struct mv88e6xxx_hw_stat *stat,
> + uint64_t *data);
Since you are touching this function prototype anyway, I guess you could
change its return type. Int assumes it can also return a negative error
code, which it doesn't. Maybe size_t to denote that it returns an unsigned
count of statistics?
Also, there is an extraneous space before the "int port" argument which
you could fix up now.
> int (*set_cpu_port)(struct mv88e6xxx_chip *chip, int port);
> int (*set_egress_port)(struct mv88e6xxx_chip *chip,
> enum mv88e6xxx_egress_direction direction,
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