linux-kernel - Re: [PATCH v2 net-next 3/5] drivers/net/phy: add connection between ethtool and phylib for PLCA

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Message-ID: <Y7mt8IUUbMv6bt5v@lunn.ch>
Date:   Sat, 7 Jan 2023 18:37:52 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Piergiorgio Beruto <piergiorgio.beruto@...il.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Oleksij Rempel <o.rempel@...gutronix.de>,
        mailhol.vincent@...adoo.fr, sudheer.mogilappagari@...el.com,
        sbhatta@...vell.com, linux-doc@...r.kernel.org,
        wangjie125@...wei.com, corbet@....net, lkp@...el.com,
        gal@...dia.com, gustavoars@...nel.org
Subject: Re: [PATCH v2 net-next 3/5] drivers/net/phy: add connection between
 ethtool and phylib for PLCA

> +	// if not enabling PLCA, skip a few sanity checks
> +	if (plca_cfg->enabled <= 0)
> +		goto apply_cfg;
> +
> +	if (!linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1S_P2MP_Half_BIT,
> +			       phydev->advertising)) {
> +		ret = -EOPNOTSUPP;
> +		NL_SET_ERR_MSG(extack,
> +			       "Point to Multi-Point mode is not enabled");
> +	}
> +
> +	// allow setting node_id concurrently with enabled
> +	if (plca_cfg->node_id >= 0)
> +		curr_plca_cfg->node_id = plca_cfg->node_id;
> +
> +	if (curr_plca_cfg->node_id >= 255) {
> +		NL_SET_ERR_MSG(extack, "PLCA node ID is not set");
> +		ret = -EINVAL;
> +		goto out_drv;
> +	}
> +
> +apply_cfg:
> +	ret = phydev->drv->set_plca_cfg(phydev, plca_cfg);

Goto which don't jump to the end of the function is generally frowned
upon. I suggest you put these sanity checks into a little helper, so
you can avoid the goto.

With that change make, feel free to add my reviewed-by.

     Andrew