netdev - Re: [PATCH RFC 1/2] net: dsa: integrate with SWITCHDEV for HW bridging

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Date:	Tue, 17 Feb 2015 12:13:09 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
CC:	davem@...emloft.net, vivien.didelot@...oirfairelinux.com,
	jerome.oufella@...oirfairelinux.com, andrew@...n.ch,
	cphealy@...il.com
Subject: Re: [PATCH RFC 1/2] net: dsa: integrate with SWITCHDEV for HW bridging

On 02/17/2015 11:26 AM, Florian Fainelli wrote:
> In order to support bridging offloads in DSA switch drivers, select
> NET_SWITCHDEV to get access to the port_stp_update and parent_get_id
> NDOs that we are required to implement.
>
> To facilitate the integratation at the DSA driver level, we implement 3
> types of operations:
>
> - port_join_bridge
> - port_leave_bridge
> - port_stp_update
>
> DSA will resolve which switch ports that are currently bridge port
> members as some Switch hardware/drivers need to know about that to limit
> the register programming to just the relevant registers (especially for
> slow MDIO buses).
>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>   include/net/dsa.h  |  10 +++++
>   net/dsa/Kconfig    |   1 +
>   net/dsa/dsa.c      |   7 ++++
>   net/dsa/dsa_priv.h |   2 +
>   net/dsa/slave.c    | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>   5 files changed, 137 insertions(+)
>
> diff --git a/include/net/dsa.h b/include/net/dsa.h
> index ed3c34bbb67a..92be34791963 100644
> --- a/include/net/dsa.h
> +++ b/include/net/dsa.h
> @@ -275,6 +275,16 @@ struct dsa_switch_driver {
>   	int	(*get_regs_len)(struct dsa_switch *ds, int port);
>   	void	(*get_regs)(struct dsa_switch *ds, int port,
>   			    struct ethtool_regs *regs, void *p);
> +
> +	/*
> +	 * Bridge integration
> +	 */
> +	int	(*port_join_bridge)(struct dsa_switch *ds, int port,
> +				    u32 br_port_mask);
> +	int	(*port_leave_bridge)(struct dsa_switch *ds, int port,
> +				     u32 br_port_mask);
> +	int	(*port_stp_update)(struct dsa_switch *ds, int port,
> +				   u8 state);
>   };
>
>   void register_switch_driver(struct dsa_switch_driver *type);
> diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
> index 5f8ac404535b..b45206e8dd3e 100644
> --- a/net/dsa/Kconfig
> +++ b/net/dsa/Kconfig
> @@ -8,6 +8,7 @@ config NET_DSA
>   	tristate
>   	depends on HAVE_NET_DSA
>   	select PHYLIB
> +	select NET_SWITCHDEV

Should this be "select" or "depends on" ?

Downside of depends is that we'll need some ifdefs in the code,
but on the other side it would let people disable it if it is
not needed.

Thanks,
Guenter

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