netdev - Re: [patch net-next RFC 03/12] net: introduce generic switch devices support

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Message-ID: <20140824114605.GC32741@casper.infradead.org>
Date:	Sun, 24 Aug 2014 12:46:05 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
	andy@...yhouse.net, dborkman@...hat.com, ogerlitz@...lanox.com,
	jesse@...ira.com, pshelar@...ira.com, azhou@...ira.com,
	ben@...adent.org.uk, stephen@...workplumber.org,
	jeffrey.t.kirsher@...el.com, vyasevic@...hat.com,
	xiyou.wangcong@...il.com, john.r.fastabend@...el.com,
	edumazet@...gle.com, jhs@...atatu.com, sfeldma@...ulusnetworks.com,
	f.fainelli@...il.com, roopa@...ulusnetworks.com,
	linville@...driver.com, dev@...nvswitch.org, jasowang@...hat.com,
	ebiederm@...ssion.com, nicolas.dichtel@...nd.com,
	ryazanov.s.a@...il.com, buytenh@...tstofly.org,
	aviadr@...lanox.com, nbd@...nwrt.org, alexei.starovoitov@...il.com,
	Neil.Jerram@...aswitch.com, ronye@...lanox.com
Subject: Re: [patch net-next RFC 03/12] net: introduce generic switch devices
 support

On 08/21/14 at 06:18pm, Jiri Pirko wrote:
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 39294b9..8b5d14c 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -49,6 +49,8 @@
>  
>  #include <linux/netdev_features.h>
>  #include <linux/neighbour.h>
> +#include <linux/sw_flow.h>
> +
>  #include <uapi/linux/netdevice.h>
>  
>  struct netpoll_info;
> @@ -997,6 +999,24 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
> + * int (*ndo_swdev_flow_insert)(struct net_device *dev,
> + *				const struct sw_flow *flow);
> + *	Called to insert a flow into switch device. If driver does
> + *	not implement this, it is assumed that the hw does not have
> + *	a capability to work with flows.

I asume you are planning to add an additional expandable struct
paramter to handle insertion parameters when the first is introduced
to avoid requiring to touch every driver every time.

> +/**
> + *	swdev_flow_insert - Insert a flow into switch
> + *	@dev: port device
> + *	@flow: flow descriptor
> + *
> + *	Insert a flow into switch this port is part of.
> + */
> +int swdev_flow_insert(struct net_device *dev, const struct sw_flow *flow)
> +{
> +	const struct net_device_ops *ops = dev->netdev_ops;
> +
> +	print_flow(flow, dev, "insert");
> +	if (!ops->ndo_swdev_flow_insert)
> +		return -EOPNOTSUPP;
> +	WARN_ON(!ops->ndo_swdev_get_id);
> +	BUG_ON(!flow->actions);
> +	return ops->ndo_swdev_flow_insert(dev, flow);
> +}
> +EXPORT_SYMBOL(swdev_flow_insert);

Splitting the flow specific API into a separate file (maybe
swdev_flow.c?) might help resolve some of the concerns around the
focus on flows. It would make it clear that it's one of multiple
models to be supported.
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