netdev - Re: [RFC PATCH net-next 2/7] net: ethtool: add support for Frame Preemption and MAC Merge layer

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Date:   Tue, 16 Aug 2022 20:22:09 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Rui Sousa <rui.sousa@....com>,
        Ferenc Fejes <ferenc.fejes@...csson.com>
Subject: Re: [RFC PATCH net-next 2/7] net: ethtool: add support for Frame
 Preemption and MAC Merge layer

On Wed, 17 Aug 2022 01:29:15 +0300 Vladimir Oltean wrote:
> +/**
> + * struct ethtool_mm_state - 802.3 MAC merge layer state
> + */
> +struct ethtool_mm_state {
> +	u32 verify_time;
> +	enum ethtool_mm_verify_status verify_status;
> +	bool supported;
> +	bool enabled;
> +	bool active;

The enabled vs active piqued my interest. Is there some handshake /
aneg or such?

> +	nest_table = nla_nest_start(skb, ETHTOOL_A_FP_PARAM_TABLE);
> +	if (!nest_table)
> +		return -EMSGSIZE;

Don't warp tables in nests, let the elements repeat in the parent.