netdev - Re: [patch net-next 3/4] mlxsw: Add interface to access registers and process events

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Message-ID: <20150724051859.GA2178@nanopsycho.orion>
Date:	Fri, 24 Jul 2015 07:18:59 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Scott Feldman <sfeldma@...il.com>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, idosch@...lanox.com,
	eladr@...lanox.com,
	"ogerlitz@...lanox.com" <ogerlitz@...lanox.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Thomas Graf <tgraf@...g.ch>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	john fastabend <john.fastabend@...il.com>,
	"simon.horman@...ronome.com" <simon.horman@...ronome.com>,
	John Linville <linville@...driver.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Shrijeet Mukherjee <shm@...ulusnetworks.com>,
	"nhorman@...driver.com" <nhorman@...driver.com>,
	Jiri Pirko <jiri@...lanox.com>
Subject: Re: [patch net-next 3/4] mlxsw: Add interface to access registers
 and process events

Fri, Jul 24, 2015 at 07:13:42AM CEST, sfeldma@...il.com wrote:
>On Thu, Jul 23, 2015 at 8:43 AM, Jiri Pirko <jiri@...nulli.us> wrote:
>> From: Ido Schimmel <idosch@...lanox.com>
>>
>> Add the ability to construct mailbox-style register access messages
>> called EMADs with provisions to construct and parse the registers payload.
>> Implement EMAD transaction layer which is responsible for the reliable
>> transmission of EMADs.
>> Also, add an infrastructure used by the switch driver to register for
>> particular events generated by the device.
>
>What is this EMADs used for?  Is this for intra-switch or inter-switch
>communications?

It is used for passing configuration messages to/from switch device.
It is also used for events. EMADS are passed inside skb like ordinary
packets. They do not leave the switch.

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