linux-kernel - Re: [PATCH] hyperv: Add netpoll support

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Message-ID: <20140708224724.GA2994@electric-eye.fr.zoreil.com>
Date:	Wed, 9 Jul 2014 00:47:24 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Richard Weinberger <richard@....at>
Cc:	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hyperv: Add netpoll support

Richard Weinberger <richard@....at> :
[...]
> This won't work as netpoll runs with IRQs disabled.
> ->ndo_poll_controller() has to make sure that SKBs can be received and transmitted
> while IRQs are off. I thought calling the channel callback by hand would be
> enough to receive SKBs.

What are you taking about ? netconsole does not need to receive.

hyperv start_xmit handler almost does its own Tx completion as you have
noticed. The situation is imho close to a virtual device one as was veth
in bb446c19fefd7b4435adb12a9dd7666adc5b553a.

-- 
Ueimor
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