netdev - Re: [PATCH net-next 2/4] net: dsa: Add wrappers for overloaded ndo

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Date:   Sun, 19 Jul 2020 17:40:14 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Taehee Yoo <ap420073@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Maxim Mikityanskiy <maximmi@...lanox.com>,
        Richard Cochran <richardcochran@...il.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 2/4] net: dsa: Add wrappers for overloaded
 ndo_ops

> +#if IS_ENABLED(CONFIG_NET_DSA)
> +#define dsa_build_ndo_op(name, arg1_type, arg1_name, arg2_type, arg2_name) \
> +static int inline dsa_##name(struct net_device *dev, arg1_type arg1_name, \
> +			     arg2_type arg2_name)	\
> +{							\
> +	const struct dsa_netdevice_ops *ops;		\
> +	int err = -EOPNOTSUPP;				\
> +							\
> +	if (!dev->dsa_ptr)				\
> +		return err;				\
> +							\
> +	ops = dev->dsa_ptr->netdev_ops;			\
> +	if (!ops || !ops->name)				\
> +		return err;				\
> +							\
> +	return ops->name(dev, arg1_name, arg2_name);	\
> +}
> +#else
> +#define dsa_build_ndo_op(name, ...)			\
> +static inline int dsa_##name(struct net_device *dev, ...) \
> +{							\
> +	return -EOPNOTSUPP;				\
> +}
> +#endif
> +
> +dsa_build_ndo_op(ndo_do_ioctl, struct ifreq *, ifr, int, cmd);
> +dsa_build_ndo_op(ndo_get_phys_port_name, char *, name, size_t, len);

Hi Florian

I tend to avoid this sort of macro magic. Tools like
https://elixir.bootlin.com/ and other cross references have trouble
following it. The current macros only handle calls with two
parameters. And i doubt it is actually saving many lines of code, if
there are only two invocations.

      Andrew