linux-kernel - RE: [PATCH 1/1] net/hyperv: Fix the code handling tx busy

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Date:	Mon, 19 Mar 2012 11:30:58 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	KY Srinivasan <kys@...rosoft.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: RE: [PATCH 1/1] net/hyperv: Fix the code handling tx busy

On Mon, 2012-03-19 at 17:50 +0000, Haiyang Zhang wrote:

> As in my previous reply to Eric --
> We actually stop queue when the ring buffer is busy, see the code in netvsc.c
> 
> I have tested with one CPU. After NETDEV_TX_BUSY is returned, the Linux guest OS
> continues to respond without any problem.

Then something is wrong somewhere.

Dont hide a bug adding a trick.

If you ever return NETDEV_TX_BUSY from start_xmit(), then you MUST call
netif_tx_stop_queue() as well right before.

I believe I already told this before...


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