netdev - Re: [PATCH net-next v2 3/9] ethtool: add a new command for reading standard stats

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Date:   Sun, 18 Apr 2021 11:20:04 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, andrew@...n.ch,
        mkubecek@...e.cz, idosch@...dia.com, saeedm@...dia.com,
        michael.chan@...adcom.com
Subject: Re: [PATCH net-next v2 3/9] ethtool: add a new command for reading
 standard stats

On Fri, Apr 16, 2021 at 12:27:39PM -0700, Jakub Kicinski wrote:
> +static int stats_prepare_data(const struct ethnl_req_info *req_base,
> +			      struct ethnl_reply_data *reply_base,
> +			      struct genl_info *info)
> +{
> +	const struct stats_req_info *req_info = STATS_REQINFO(req_base);
> +	struct stats_reply_data *data = STATS_REPDATA(reply_base);
> +	struct net_device *dev = reply_base->dev;
> +	int ret;
> +
> +	ret = ethnl_ops_begin(dev);
> +	if (ret < 0)
> +		return ret;
> +

Nit: A comment here would be nice. Something like:

Mark all stats as unset (see ETHTOOL_STAT_NOT_SET) to prevent them from
being reported to user space in case driver did not set them.

> +	memset(&data->phy_stats, 0xff, sizeof(data->phy_stats));
> +
> +	if (test_bit(ETHTOOL_STATS_ETH_PHY, req_info->stat_mask) &&
> +	    dev->ethtool_ops->get_eth_phy_stats)
> +		dev->ethtool_ops->get_eth_phy_stats(dev, &data->phy_stats);
> +
> +	ethnl_ops_complete(dev);
> +	return 0;
> +}