netdev - Re: [PATCH v3 net-next 06/15] net: dsa: add a generic procedure for the flow dissector

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Date:   Sat, 26 Sep 2020 22:33:00 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, f.fainelli@...il.com,
        vivien.didelot@...il.com, kuba@...nel.org
Subject: Re: [PATCH v3 net-next 06/15] net: dsa: add a generic procedure for
 the flow dissector

> +static inline void dsa_tag_generic_flow_dissect(const struct sk_buff *skb,
> +						__be16 *proto, int *offset)
> +{
> +#if IS_ENABLED(CONFIG_NET_DSA)
> +	const struct dsa_device_ops *ops = skb->dev->dsa_ptr->tag_ops;
> +	int tag_len = ops->overhead;
> +
> +	*offset = tag_len;
> +	*proto = ((__be16 *)skb->data)[(tag_len / 2) - 1];
> +#endif
> +}
> +

Do you actually need the IS_ENABLED()? There is only one caller of
this function, and it is already protected by
IS_ENABLED(CONFIG_NET_DSA). So i don't think it adds anything.

    Andrew