linux-kernel - Re: [patch net-next v2 01/15] net: introduce upper device lists

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Message-Id: <20120815.151223.1108632083114612511.davem@davemloft.net>
Date:	Wed, 15 Aug 2012 15:12:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	jiri@...nulli.us, netdev@...r.kernel.org, edumazet@...gle.com,
	faisal.latif@...el.com, roland@...nel.org, sean.hefty@...el.com,
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	divy@...lsio.com, jitendra.kalsaria@...gic.com,
	sony.chacko@...gic.com, linux-driver@...gic.com, kaber@...sh.net,
	ursula.braun@...ibm.com, blaschka@...ux.vnet.ibm.com,
	linux390@...ibm.com, shemminger@...tta.com, therbert@...gle.com,
	xiyou.wangcong@...il.com, joe@...ches.com,
	gregory.v.rose@...el.com, john.r.fastabend@...el.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org, bridge@...ts.linux-foundation.org,
	fbl@...hat.com
Subject: Re: [patch net-next v2 01/15] net: introduce upper device lists

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Tue, 14 Aug 2012 23:33:44 +0100

> I think we will also need to limit the depth of the device stack so we
> don't run out of stack space here.  __netif_receive() implements a kind
> of tail recursion whenever a packet is passed up, but
> __netdev_has_upper_dev() can't avoid doing real recursion (without the
> addition of a flag to net_device so it can mark its progress).

Agreed, we need some kind of limit here.
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