netdev - Re: [PATCH v8 3/3] net: hisilicon: new hip04 ethernet driver

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Message-ID: <34612839.hAkXUcbKUQ@wuerfel>
Date:	Wed, 10 Dec 2014 17:36:46 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	David Miller <davem@...emloft.net>, mark.rutland@....com,
	devicetree@...r.kernel.org, f.fainelli@...il.com,
	linux@....linux.org.uk, eric.dumazet@...il.com,
	sergei.shtylyov@...entembedded.com, netdev@...r.kernel.org,
	agraf@...e.de, xuwei5@...ilicon.com, David.Laight@...lab.com,
	dingtianhong@...wei.com, zhangfei.gao@...aro.org
Subject: Re: [PATCH v8 3/3] net: hisilicon: new hip04 ethernet driver

On Wednesday 10 December 2014 11:07:32 David Miller wrote:
> From: Arnd Bergmann <arnd@...db.de>
> Date: Wed, 10 Dec 2014 10:35:20 +0100
> 
> > On Wednesday 10 December 2014 14:45:29 Ding Tianhong wrote:
> >> 
> >> Miss this code, I think the best way is skb_orphan(skb), just like the cxgb3 drivers, some hardware
> >> didn't use the tx inq to free dmad Tx packages.
> > 
> > The problem with skb_orphan is that you are telling the network stack that
> > the packet is now out of its reach and it will no longer be able to take
> > queued packets into account.
> 
> skb_orphan() also does not release netfilter resources attached to the
> packet.
> 
> Really, all drivers must free TX SKBs in a small, finite, amount of
> time after submission.
> 
> There is no way around this.

I see. Do you see a problem with returning early from napi->poll()
without calling napi_complete() when the TX queue remains full at
the end of the poll function?

Or is there any better alternative for broken hardware that lacks
a TX-complete interrupt?

	Arnd
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