netdev - Re: [PATCH net-next v2 3/3] gianfar: Implement PAUSE frame generation support

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Date:	Thu, 23 Oct 2014 12:36:55 +0300
From:	Claudiu Manoil <claudiu.manoil@...escale.com>
To:	Matei Pavaluca <matei.pavaluca@...escale.com>,
	<netdev@...r.kernel.org>
CC:	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next v2 3/3] gianfar: Implement PAUSE frame generation
 support

On 10/23/2014 12:18 PM, Matei Pavaluca wrote:
> The hardware can automatically generate pause frames when the number
> of free buffers drops under a certain threshold, but in order to do this,
> the address of the last free buffer needs to be written to a specific
> register for each RX queue.
>
> This has to be done in 'gfar_clean_rx_ring' which is called for each
> RX queue. In order not to impact performance, by adding a register write
> for each incoming packet, this operation is done only when the PAUSE frame
> transmission is enabled.
>
> Whenever the link is readjusted, this capability is turned on or off.
>
> Signed-off-by: Matei Pavaluca <matei.pavaluca@...escale.com>
> ---
>
> v2:
>    - Added unlikely() in 'gfar_clean_rx_ring'
>    - Removed some unused variables

Acked-by: Claudiu Manoil <claudiu.manoil@...escale.com>

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