linux-kernel - Re: [PATCH 2.6.25] - Fix transmit queue stop mechanism

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Message-ID: <47DE5F75.4030700@garzik.org>
Date:	Mon, 17 Mar 2008 08:09:25 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Divy Le Ray <divy@...lsio.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	swise@...ngridcomputing.com
Subject: Re: [PATCH 2.6.25] - Fix transmit queue stop mechanism

Divy Le Ray wrote:
> From: Divy Le Ray <divy@...lsio.com>
> 
> The last change in the Tx queue stop mechanism opens a window
> where the Tx queue might be stopped after pending credits
> returned.
> 
> Tx credits are returned via a control message generated by the HW.
> It returns tx credits on demand, triggered by a completion bit
> set in selective transmit packet headers.
> 
> The current code can lead to the Tx queue stopped
> with all pending credits returned, and the current frame
> not triggering a credit return. The Tx queue will then never be
> awaken.
> 
> The driver could alternatively request a completion for packets
> that stop the queue. It's however safer at this point to go back
> to the pre-existing behaviour.
> 
> Signed-off-by: Divy Le Ray <divy@...lsio.com>
> ---
> 
>  drivers/net/cxgb3/sge.c |   12 +++++++++---
>  1 files changed, 9 insertions(+), 3 deletions(-)

applied -- please include "cxgb3: " prefix in your subject line next time.

See http://linux.yyz.us/patch-format.html for more info.

	Jeff


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