netdev - Re: [PATCH net-next 4/4] net: dsa: assign a master to slave ports

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Date:   Sat, 2 Sep 2017 17:34:35 +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>
Subject: Re: [PATCH net-next 4/4] net: dsa: assign a master to slave ports

On Thu, Aug 31, 2017 at 02:37:46PM -0400, Vivien Didelot wrote:
> Because each DSA slave port may use a different DSA master port, add a
> pointer to a master in the slave structure. This is a preparatory patch
> for multiple CPU ports.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> ---
>  net/dsa/dsa_priv.h |  7 ++-----
>  net/dsa/slave.c    | 33 ++++++++++++++++++---------------
>  2 files changed, 20 insertions(+), 20 deletions(-)
> 
> diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
> index 59f155cbbe87..a8cd6cbe4061 100644
> --- a/net/dsa/dsa_priv.h
> +++ b/net/dsa/dsa_priv.h
> @@ -66,6 +66,8 @@ struct dsa_notifier_vlan_info {
>  };
>  
>  struct dsa_slave_priv {
> +	struct dsa_master *master;
> +
>  	/* Copy of the master xmit tagging op for faster access in hot path */
>  	struct sk_buff *	(*xmit)(struct sk_buff *skb,
>  					struct net_device *dev);
> @@ -179,9 +181,4 @@ extern const struct dsa_device_ops qca_netdev_ops;
>  /* tag_trailer.c */
>  extern const struct dsa_device_ops trailer_netdev_ops;
>  
> -static inline struct net_device *dsa_master_netdev(struct dsa_slave_priv *p)
> -{
> -	return p->dp->ds->dst->master->netdev;
> -}
> -

Hi Vivien

Why remove this helper, when it could become p->master->netdev ?

    Andrew