netdev - RE: [PATCH] net/hyperv: Fix the stop/wake queue mechanism

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Date:	Fri, 9 Dec 2011 16:00:59 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	KY Srinivasan <kys@...rosoft.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: RE: [PATCH] net/hyperv: Fix the stop/wake queue mechanism

> -----Original Message-----
> From: Haiyang Zhang [mailto:haiyangz@...rosoft.com]
> Sent: Friday, December 02, 2011 2:56 PM
> To: Haiyang Zhang; KY Srinivasan; davem@...emloft.net; gregkh@...e.de;
> linux-kernel@...r.kernel.org; netdev@...r.kernel.org;
> devel@...uxdriverproject.org
> Subject: [PATCH] net/hyperv: Fix the stop/wake queue mechanism
> 
> The ring buffer is only used to pass meta data for outbound packets. The
> actual payload is accessed by DMA from the host. So the stop/wake queue
> mechanism based on counting and comparing number of pages sent v.s.
> number
> of pages in the ring buffer is wrong. Also, there is a race condition in
> the stop/wake queue calls, which can stop xmit queue forever.
> 
> The new stop/wake queue mechanism is based on the actual bytes used by
> outbound packets in the ring buffer. The check for number of outstanding
> sends after stop queue prevents the race condition that can cause wake
> queue happening earlier than stop queue.
> 
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Reported-by: Long Li <longli@...rosoft.com>
> ---
>  drivers/net/hyperv/netvsc.c     |   14 +++++++++++---
>  drivers/net/hyperv/netvsc_drv.c |   24 +-----------------------
>  2 files changed, 12 insertions(+), 26 deletions(-)

Hi Greg,

Since the netvsc haven't been merged into Dave's tree yet after out of staging,
could you consider this patch for your tree?

Thanks,
-  Haiyang


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