linux-kernel - Re: [PATCH net-next 1/3] net: macb: queue tie-off or disable during WOL suspend

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Date: Tue, 6 Feb 2024 21:14:21 +0530
From: "Karumanchi, Vineeth" <vineeth.karumanchi@....com>
To: claudiu beznea <claudiu.beznea@...on.dev>, nicolas.ferre@...rochip.com,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org, linux@...linux.org.uk
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, git@....com
Subject: Re: [PATCH net-next 1/3] net: macb: queue tie-off or disable during
 WOL suspend

Hi Claudiu,


On 2/3/2024 9:08 PM, claudiu beznea wrote:
<...>
>> +		for (q = 0, queue = bp->queues; q < bp->num_queues;
>> +		     ++q, ++queue) {
>> +			/* Disable RX queues */
> Operation in this for loop could be moved in the the above IRQ disable
> loop. Have you tried it? are there any issues with it?

OK. I haven't tried it. I will try and update.

> 
>> +			if (bp->caps & MACB_CAPS_QUEUE_DISABLE) {
>> +				queue_writel(queue, RBQP, GEM_RBQP_DISABLE);
>> +			} else {
>> +				/* Tie off RX queues */
>> +				queue_writel(queue, RBQP,
>> +					     lower_32_bits(bp->rx_ring_tieoff_dma));
> I think this should be guarded by:
> #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
>> +				queue_writel(queue, RBQPH,
>> +					     upper_32_bits(bp->rx_ring_tieoff_dma));
>> +			}
>> +		}
>> +		/* Enable Receive engine */
>> +		ctrlmask = macb_readl(bp, NCR);
> Is this needed?

Yes, not needed, we can use earlier value directly.

> 
>> +		ctrlmask |= MACB_BIT(RE);
<...>
-- 
🙏 vineeth