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

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Message-ID: <53BC51B4.4010703@nod.at>
Date:	Tue, 08 Jul 2014 22:16:52 +0200
From:	Richard Weinberger <richard@....at>
To:	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
CC:	"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

Am 08.07.2014 22:03, schrieb KY Srinivasan:
> The VCPU the channel is bound to is available in the channel state. You could use the following code
> Fragment to ensure that the call is made on the "right" cpu:
> 
> smp_call_function_single(dev->channel->target_cpu,
>                                          netvsc_channel_cb, dev->channel, true);

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.

Thanks,
//richard
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