netdev - Re: [PATCH v5 1/2] net: dsa: add optional stats64 support

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Date:   Sat, 12 Dec 2020 15:51:52 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH v5 1/2] net: dsa: add optional stats64 support

On Fri, Dec 11, 2020 at 11:53:21AM +0100, Oleksij Rempel wrote:
> Allow DSA drivers to export stats64
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> Reviewed-by: Vladimir Oltean <olteanv@...il.com>
> ---
>  include/net/dsa.h |  3 +++
>  net/dsa/slave.c   | 14 +++++++++++++-
>  2 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/include/net/dsa.h b/include/net/dsa.h
> index 4e60d2610f20..457b89143875 100644
> --- a/include/net/dsa.h
> +++ b/include/net/dsa.h
> @@ -655,6 +655,9 @@ struct dsa_switch_ops {
>  	int	(*port_change_mtu)(struct dsa_switch *ds, int port,
>  				   int new_mtu);
>  	int	(*port_max_mtu)(struct dsa_switch *ds, int port);
> +
> +	void	(*get_stats64)(struct dsa_switch *ds, int port,
> +				   struct rtnl_link_stats64 *s);

Nitpick: I would have probably put it under the "ethtool hardware
statistics." category, at the same time renaming it into "Port
statistics counters."

>  };
>  
>  #define DSA_DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes)		\
> diff --git a/net/dsa/slave.c b/net/dsa/slave.c
> index ff2266d2b998..6e1a4dc18a97 100644
> --- a/net/dsa/slave.c
> +++ b/net/dsa/slave.c
> @@ -1602,6 +1602,18 @@ static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
>  	return dp->ds->devlink ? &dp->devlink_port : NULL;
>  }
>  
> +static void dsa_slave_get_stats64(struct net_device *dev,
> +				  struct rtnl_link_stats64 *s)
> +{
> +	struct dsa_port *dp = dsa_slave_to_port(dev);
> +	struct dsa_switch *ds = dp->ds;
> +
> +	if (!ds->ops->get_stats64)
> +		return dev_get_tstats64(dev, s);
> +
> +	return ds->ops->get_stats64(ds, dp->index, s);
> +}
> +
>  static const struct net_device_ops dsa_slave_netdev_ops = {
>  	.ndo_open	 	= dsa_slave_open,
>  	.ndo_stop		= dsa_slave_close,
> @@ -1621,7 +1633,7 @@ static const struct net_device_ops dsa_slave_netdev_ops = {
>  #endif
>  	.ndo_get_phys_port_name	= dsa_slave_get_phys_port_name,
>  	.ndo_setup_tc		= dsa_slave_setup_tc,
> -	.ndo_get_stats64	= dev_get_tstats64,
> +	.ndo_get_stats64	= dsa_slave_get_stats64,
>  	.ndo_get_port_parent_id	= dsa_slave_get_port_parent_id,
>  	.ndo_vlan_rx_add_vid	= dsa_slave_vlan_rx_add_vid,
>  	.ndo_vlan_rx_kill_vid	= dsa_slave_vlan_rx_kill_vid,
> -- 
> 2.29.2
>