netdev - Re: [patch net-next RFC 12/12] rocker: introduce rocker switch driver

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Date:	Fri, 29 Aug 2014 09:06:37 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Thomas Graf <tgraf@...g.ch>
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 12/12] rocker: introduce rocker switch driver

Sat, Aug 23, 2014 at 04:04:50PM CEST, tgraf@...g.ch wrote:
>On 08/21/14 at 06:19pm, Jiri Pirko wrote:
>> This patch introduces the first driver to benefit from the switchdev
>> infrastructure and to implement newly introduced switch ndos. This is a
>> driver for emulated switch chip implemented in qemu:
>> https://github.com/sfeldma/qemu-rocker/
>
>The design looks very clean. I noticed that the TLV API is almost an
>exact dupliate of the Netlink attributes API. Any specific reason for
>not reusing lib/nlattr.c and add what is missing?

Well the api is almost the same. But the implementation is different.
See for example rocker_tlv_put. It works directly with desc info.
But nla_put works with skb which is not convenient for rocker.

Also, struct nlattr is 2xu16 but struct rocker_tlv is u32 u16
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