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

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Message-ID: <6869a7dec43b4ba6b38692874f67279a@DFM-DB3MBX15-06.exchange.corp.microsoft.com>
Date:	Tue, 8 Jul 2014 17:55:35 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	Richard Weinberger <richard@....at>,
	KY Srinivasan <kys@...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



> -----Original Message-----
> From: Richard Weinberger [mailto:richard@....at]
> Sent: Tuesday, July 8, 2014 5:32 AM
> To: KY Srinivasan; Haiyang Zhang
> Cc: devel@...uxdriverproject.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; Richard Weinberger
> Subject: [PATCH] hyperv: Add netpoll support
> 
> In order to have at least a netconsole to debug kernel issues on
> Windows Azure this patch implements netpoll support.
> Sending packets is easy, netvsc_start_xmit() does already everything
> needed.
> To receive we need to trigger the channel callback which is usally
> called via tasklet_schedule().
> 
> Signed-off-by: Richard Weinberger <richard@....at>
> ---
>  drivers/net/hyperv/netvsc_drv.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/net/hyperv/netvsc_drv.c
> b/drivers/net/hyperv/netvsc_drv.c
> index 4fd71b7..367b71e 100644
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -736,6 +736,17 @@ static int netvsc_set_mac_addr(struct net_device
> *ndev, void *p)
>  	return err;
>  }
> 
> +#ifdef CONFIG_NET_POLL_CONTROLLER
> +static void netvsc_poll_controller(struct net_device *net)
> +{
> +	struct net_device_context *net_device_ctx = netdev_priv(net);
> +	struct hv_device *dev = net_device_ctx->device_ctx;
> +
> +	local_bh_disable();
> +	netvsc_channel_cb(dev->channel);

This can only poll the primary channel not the sub channels.

Thanks,
- Haiyang
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