netdev - Re: [patch net-next v2 07/10] bridge: call netdev_sw_port_stp_update when bridge port STP status changes

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Date:	Mon, 10 Nov 2014 08:11:37 -0500
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
CC:	davem@...emloft.net, nhorman@...driver.com, andy@...yhouse.net,
	tgraf@...g.ch, dborkman@...hat.com, ogerlitz@...lanox.com,
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	ben@...adent.org.uk, stephen@...workplumber.org,
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	xiyou.wangcong@...il.com, john.r.fastabend@...el.com,
	edumazet@...gle.com, sfeldma@...il.com, f.fainelli@...il.com,
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	alexei.starovoitov@...il.com, Neil.Jerram@...aswitch.com,
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	mleitner@...hat.com, shrijeet@...il.com, gospo@...ulusnetworks.com,
	bcrl@...ck.org
Subject: Re: [patch net-next v2 07/10] bridge: call netdev_sw_port_stp_update
 when bridge port STP status changes

On 11/09/14 05:51, Jiri Pirko wrote:
> From: Scott Feldman <sfeldma@...il.com>
>
> To notify switch driver of change in STP state of bridge port, add new
> .ndo op and provide swdev wrapper func to call ndo op. Use it in bridge
> code then.
>
> Signed-off-by: Scott Feldman <sfeldma@...il.com>
> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
> ---
>   include/linux/netdevice.h |  6 ++++++
>   include/net/switchdev.h   |  6 ++++++
>   net/bridge/br_netlink.c   |  2 ++
>   net/bridge/br_stp.c       |  4 ++++
>   net/bridge/br_stp_if.c    |  3 +++
>   net/bridge/br_stp_timer.c |  2 ++
>   net/switchdev/switchdev.c | 19 +++++++++++++++++++
>   7 files changed, 42 insertions(+)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 116a19d..35f21a95 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1033,6 +1033,10 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
>    *			      const unsigned char *addr,
>    *			      u16 vid);
>    *	Called to delete a fdb from switch device port.
> + *
> + * int (*ndo_sw_port_stp_update)(struct net_device *dev, u8 state);
> + *	Called to notify switch device port of bridge port STP
> + *	state change.

You are unconditionally calling
netdev_sw_port_stp_update(p->dev, p->state);
Again issue is policy. Could you make this work the same
way the fdb_add e.g user intent of whether i want to turn
a port in hardware and/or software to disabled/learning/etc
is reflected?

btw: does _sw_ stand for switch? why not _hw_ ?
Could we have one ndo for all flags instead of individual ones.

I know the current user space code uses u8 as a bitflag; but
maybe we can introduce a new u32 flag bitmask that has all the
flags set for backward compat? I can count about a total of 10.

cheers,
jamal

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