netdev - Re: [RFC 07/20] net: dsa: list ports in switch\\

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Message-ID: <20160427231537.GJ29024@lunn.ch>
Date:	Thu, 28 Apr 2016 01:15:37 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...oirfairelinux.com,
	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jiri Pirko <jiri@...nulli.us>
Subject: Re: [RFC 07/20] net: dsa: list ports in switch\\

On Wed, Apr 27, 2016 at 06:30:04PM -0400, Vivien Didelot wrote:
> List DSA port structures in their switch structure, so that drivers can
> iterate on them to retrieve information such as their ports membership.

And this would be so much easier using a plan array.

    Andrew

> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> ---
>  include/net/dsa.h | 9 +++++++++
>  net/dsa/dsa.c     | 4 ++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/include/net/dsa.h b/include/net/dsa.h
> index 69e467c..5f2e7df 100644
> --- a/include/net/dsa.h
> +++ b/include/net/dsa.h
> @@ -32,6 +32,11 @@ enum dsa_tag_protocol {
>  #define DSA_MAX_SWITCHES	4
>  #define DSA_MAX_PORTS		12
>  
> +#define dsa_switch_for_each_port(_ds, _dp, _num_ports)			\
> +	for (_dp = list_first_entry(&_ds->dp, typeof(*_dp), list);	\
> +	     &_dp->list != (&_ds->dp) && _dp->port < _num_ports;	\
> +	     _dp = list_next_entry(_dp, list))
> +
>  struct dsa_chip_data {
>  	/*
>  	 * How to access the switch configuration registers.
> @@ -123,6 +128,8 @@ struct dsa_switch_tree {
>  };
>  
>  struct dsa_port {
> +	struct list_head	list;
> +
>  	struct dsa_switch	*ds;
>  	int			port;
>  
> @@ -173,6 +180,8 @@ struct dsa_switch {
>  	u32			phys_mii_mask;
>  	struct mii_bus		*slave_mii_bus;
>  	struct net_device	*ports[DSA_MAX_PORTS];
> +
> +	struct list_head	dp;
>  };
>  
>  static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
> index 222494c..3daffb6 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -225,6 +225,8 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
>  	int index = ds->index;
>  	int i, ret;
>  
> +	INIT_LIST_HEAD(&ds->dp);
> +
>  	/*
>  	 * Validate supplied switch configuration.
>  	 */
> @@ -238,6 +240,8 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
>  		dp[i]->ds = ds;
>  		dp[i]->port = i;
>  
> +		list_add_tail(&dp[i]->list, &ds->dp);
> +
>  		name = pd->port_names[i];
>  		if (name == NULL)
>  			continue;
> -- 
> 2.8.0
>