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

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Message-ID: <153b5e2d-f904-3836-4eeb-0ef9698f7090@gmail.com>
Date:   Sat, 2 Sep 2017 09:29:06 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        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>
Subject: Re: [PATCH net-next 4/4] net: dsa: assign a master to slave ports



On 09/02/2017 08:34 AM, Andrew Lunn wrote:
> 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 ?

Agreed, I would keep the helper at this point to minimize the delta, it
should really identical in terms of code generated.
-- 
Florian