netdev - Re: [PATCH net-next 2/3] net: dsa: bcm_sf2: Propagate ethtool::rxnfc to CPU port

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Message-ID: <20180806223225.GE18350@lunn.ch>
Date:   Tue, 7 Aug 2018 00:32:25 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, vivien.didelot@...oirfairelinux.com,
        linville@...driver.com, davem@...emloft.net
Subject: Re: [PATCH net-next 2/3] net: dsa: bcm_sf2: Propagate ethtool::rxnfc
 to CPU port

>  int bcm_sf2_get_rxnfc(struct dsa_switch *ds, int port,
>  		      struct ethtool_rxnfc *nfc, u32 *rule_locs)
>  {
> +	struct net_device *p = ds->ports[port].cpu_dp->master;
>  	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
>  	int ret = 0;
>  
> @@ -1214,12 +1223,20 @@ int bcm_sf2_get_rxnfc(struct dsa_switch *ds, int port,
>  
>  	mutex_unlock(&priv->cfp.lock);

Hi Florian

I think you should be testing ret here. If you have had a real error,
you probably should be returning it, rather than overwriting it with
what ethtool returns below.

> +	/* Pass up the commands to the attached master network device */
> +	if (p->ethtool_ops->get_rxnfc) {
> +		ret = p->ethtool_ops->get_rxnfc(p, nfc, rule_locs);
> +		if (ret == -EOPNOTSUPP)
> +			ret = 0;
> +	}
> +
>  	return ret;
>  }

   Andrew