Subject: Re: [PATCH] hyperv: Add netpoll support

From: Richard Weinberger <[email-masked]>
Date: Wed, 09 Jul 2014 00:53:26 +0200

Am 09.07.2014 00:47, schrieb Francois Romieu:
> Richard Weinberger <[email-masked]> :
> [...]
>> 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.

Isn't netconsole is only one user of netpoll?
Of course netconsole needs only to transmit SKBs.
But if you look at other ->ndo_poll_controller implementations
you'll notice that they care also about receiving.

> 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.

Bad commit reference: bb446c19fefd7b4435adb12a9dd7666adc5b553a

:-(

Thanks,
//richard