netdev - Re: [RFC PATCH net-next 04/10] ethtool: Add link extended state

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Date:   Sun, 7 Jun 2020 18:02:46 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Amit Cohen <amitc@...lanox.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        corbet@....net, jiri@...lanox.com, idosch@...lanox.com,
        shuah@...nel.org, mkubecek@...e.cz, gustavo@...eddedor.com,
        cforno12@...ux.vnet.ibm.com, f.fainelli@...il.com,
        linux@...pel-privat.de, alexandru.ardelean@...log.com,
        ayal@...lanox.com, petrm@...lanox.com, mlxsw@...lanox.com,
        liuhangbin@...il.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [RFC PATCH net-next 04/10] ethtool: Add link extended state

> @@ -108,6 +131,12 @@ static int linkstate_reply_size(const struct ethnl_req_info *req_base,
>  	if (data->sqi_max != -EOPNOTSUPP)
>  		len += nla_total_size(sizeof(u32));
>  
> +	if (data->ext_state_provided)
> +		len += sizeof(u8); /* LINKSTATE_EXT_STATE */
> +
> +	if (data->ethtool_ext_state_info.__ext_substate)
> +		len += sizeof(u8); /* LINKSTATE_EXT_SUBSTATE */
> +

This looks wrong. A u8 attribute takes up a lot more space than
sizeof(u8) because of the TLV overheads. That is what the
nla_total_size() is for.

		 Andrew