linux-kernel - Re: [RFC PATCH net-next 1/1] net: Support for switch port configuration

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Message-ID: <20141211110115.GA1979@nanopsycho.lan>
Date:	Thu, 11 Dec 2014 12:01:15 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	"Varlese, Marco" <marco.varlese@...el.com>
Cc:	John Fastabend <john.fastabend@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>,
	"Fastabend, John R" <john.r.fastabend@...el.com>,
	"roopa@...ulusnetworks.com" <roopa@...ulusnetworks.com>,
	"sfeldma@...il.com" <sfeldma@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH net-next 1/1] net: Support for switch port
 configuration

Thu, Dec 11, 2014 at 10:59:42AM CET, marco.varlese@...el.com wrote:
>> -----Original Message-----
>> From: John Fastabend [mailto:john.fastabend@...il.com]
>> Sent: Wednesday, December 10, 2014 5:04 PM
>> To: Jiri Pirko
>> Cc: Varlese, Marco; netdev@...r.kernel.org;
>> stephen@...workplumber.org; Fastabend, John R;
>> roopa@...ulusnetworks.com; sfeldma@...il.com; linux-
>> kernel@...r.kernel.org
>> Subject: Re: [RFC PATCH net-next 1/1] net: Support for switch port
>> configuration
>> 
>> On 12/10/2014 08:50 AM, Jiri Pirko wrote:
>> > Wed, Dec 10, 2014 at 05:23:40PM CET, marco.varlese@...el.com wrote:
>> >> From: Marco Varlese <marco.varlese@...el.com>
>> >>
>> >> Switch hardware offers a list of attributes that are configurable on
>> >> a per port basis.
>> >> This patch provides a mechanism to configure switch ports by adding
>> >> an NDO for setting specific values to specific attributes.
>> >> There will be a separate patch that extends iproute2 to call the new
>> >> NDO.
>> >
>> >
>> > What are these attributes? Can you give some examples. I'm asking
>> > because there is a plan to pass generic attributes to switch ports
>> > replacing current specific ndo_switch_port_stp_update. In this case,
>> > bridge is setting that attribute.
>> >
>> > Is there need to set something directly from userspace or does it make
>> > rather sense to use involved bridge/ovs/bond ? I think that both will
>> > be needed.
>> 
>> +1
>> 
>> I think for many attributes it would be best to have both. The in kernel callers
>> and netlink userspace can use the same driver ndo_ops.
>> 
>> But then we don't _require_ any specific bridge/ovs/etc module. And we
>> may have some attributes that are not specific to any existing software
>> module. I'm guessing Marco has some examples of these.
>> 
>> [...]
>> 
>> 
>> --
>> John Fastabend         Intel Corporation
>
>We do have a need to configure the attributes directly from user-space and I have identified the tool to do that in iproute2.
>
>An example of attributes are:
>* enabling/disabling of learning of source addresses on a given port (you can imagine the attribute called LEARNING for example);
>* internal loopback control (i.e. LOOPBACK) which will control how the flow of traffic behaves from the switch fabric towards an egress port;
>* flooding for broadcast/multicast/unicast type of packets (i.e. BFLOODING, MFLOODING, UFLOODING);
>
>Some attributes would be of the type enabled/disabled while other will allow specific values to allow the user to configure different behaviours of that feature on that particular port on that platform.
>
>One thing to mention - as John stated as well - there might be some attributes that are not specific to any software module but rather have to do with the actual hardware/platform to configure.
>
>I hope this clarifies some points.

It does. Makes sense. We need to expose this attr set/get for both
in-kernel and userspace use cases.

Please adjust you patch for this. Also, as a second patch, it would be
great if you can convert ndo_switch_port_stp_update to this new ndo.

Thanks.


>
>-----------------------------------------------------------
>Marco Varlese		-	Intel Corporation
>-----------------------------------------------------------
>
>
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