linux-kernel - Re: [PATCH 5/6] net: calxedaxgmac: rework transmit ring handling

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Date:	Fri, 12 Oct 2012 12:01:00 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jonathan@...masters.org, eric.dumazet@...il.com,
	Mark Langsdorf <mark.langsdorf@...xeda.com>
Subject: Re: [PATCH 5/6] net: calxedaxgmac: rework transmit ring handling

On 10/12/2012 11:28 AM, Ben Hutchings wrote:
> On Fri, 2012-10-12 at 10:15 -0500, Rob Herring wrote:
>> From: Rob Herring <rob.herring@...xeda.com>
>>
>> Only generate tx interrupts on every ring size / 4 descriptors. Move the
>> netif_stop_queue call to the end of the xmit function rather than
>> checking at the beginning.
> [...]
> 
> The hardware should also interrupt if the TX ring becomes empty; does it
> do that?

Yes, with the "tx buffer unavailable" bit DMA_INTR_ENA_TUE. It is not a
per descriptor interrupt.

However, I just noticed I missed part of this patch to actually enable
tx descriptor interrupt. New version coming.

Rob
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