linux-kernel - Re: [PATCH net-next] net: dsa: Allow compiling out legacy support

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Message-ID: <86660f52-e711-beb4-33d2-0ea38db5a4fc@gmail.com>
Date:   Fri, 1 Dec 2017 16:00:00 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: Allow compiling out legacy support



On 12/01/2017 07:21 AM, Vivien Didelot wrote:
> Hi Florian,
> 
> Florian Fainelli <f.fainelli@...il.com> writes:
> 
>> +#if IS_ENABLED(CONFIG_NET_DSA_LEGACY)
>>  /* Legacy driver registration */
>>  void register_switch_driver(struct dsa_switch_driver *type);
>>  void unregister_switch_driver(struct dsa_switch_driver *type);
>>  struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
>>  
>> +#else
>> +static inline void register_switch_driver(struct dsa_switch_driver *type) { }
>> +static inline void unregister_switch_driver(struct dsa_switch_driver *type) { }
>> +static inline struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
>> +{
>> +	return NULL;
>> +}
>> +#endif
> 
> The .probe dsa_switch_ops is part of the legacy code, we may want to
> wrap it in a CONFIG_NET_DSA_LEGACY check as well.

Fixed, also made 88e6060 dependent on CONFIG_NET_DSA_LEGACY as a result.

> 
>>  struct net_device *dsa_dev_to_net_device(struct device *dev);
>>  
>>  /* Keep inline for faster access in hot path */
>> diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
>> index 03c3bdf25468..b6ec8e9069e4 100644
>> --- a/net/dsa/Kconfig
>> +++ b/net/dsa/Kconfig
>> @@ -16,6 +16,14 @@ config NET_DSA
>>  
>>  if NET_DSA
>>  
>> +config NET_DSA_LEGACY
> 
> We need to have it enabled by default, otherwise we'll miss errors when
> touching the code shared by both legacy and new bindings.

Fixed.

> 
>> +	bool "Support for older platform device and Device Tree registration"
>> +	---help---
>> +	  Say Y if you want to enable support for the older platform device and
>> +	  deprectaed Device Tree binding registration.
> 
>           deprecated*
> 
>> +
>> +	  This feature is scheduled for removal in 4.17.
>> +
>>  /* legacy.c */
>> +#if IS_ENABLED(CONFIG_NET_DSA_LEGACY)
>>  int dsa_legacy_register(void);
>>  void dsa_legacy_unregister(void);
>>  int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
>> @@ -106,6 +107,28 @@ int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
>>  int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
>>  		       struct net_device *dev,
>>  		       const unsigned char *addr, u16 vid);
> 
> the dsa_legacy_fdb_{add,del} routines are "legacy" in terms of FDB
> handling, not in terms of DSA bindings, we must keep them.

Oh, right. This should probably be moved somewhere else then, right? The
whole idea was to compile out net/dsa/legacy.c
-- 
Florian