linux-kernel - Re: [PATCH v2 1/5] net: cadence: macb: Set upper 32bits of DMA ring buffer

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Message-ID: <20250825165310.64027275@kernel.org>
Date: Mon, 25 Aug 2025 16:53:10 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Stanimir Varbanov <svarbanov@...e.de>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rpi-kernel@...ts.infradead.org, Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Andrew Lunn
 <andrew+netdev@...n.ch>, "David S . Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Florian Fainelli <florian.fainelli@...adcom.com>,
 Andrea della Porta <andrea.porta@...e.com>, Nicolas Ferre
 <nicolas.ferre@...rochip.com>, Claudiu Beznea <claudiu.beznea@...on.dev>,
 Phil Elwell <phil@...pberrypi.com>, Jonathan Bell
 <jonathan@...pberrypi.com>, Dave Stevenson
 <dave.stevenson@...pberrypi.com>, stable@...r.kernel.org, Andrew Lunn
 <andrew@...n.ch>, Théo Lebrun <theo.lebrun@...tlin.com>
Subject: Re: [PATCH v2 1/5] net: cadence: macb: Set upper 32bits of DMA ring
 buffer

On Fri, 22 Aug 2025 12:34:36 +0300 Stanimir Varbanov wrote:
> In case of rx queue reset and 64bit capable hardware, set the upper
> 32bits of DMA ring buffer address.
> 
> Cc: stable@...r.kernel.org # v4.6+
> Fixes: 9ba723b081a2 ("net: macb: remove BUG_ON() and reset the queue to handle RX errors")
> Credits-to: Phil Elwell <phil@...pberrypi.com>
> Credits-to: Jonathan Bell <jonathan@...pberrypi.com>
> Signed-off-by: Stanimir Varbanov <svarbanov@...e.de>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>

> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index ce95fad8cedd..36717e7e5811 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -1634,7 +1634,11 @@ static int macb_rx(struct macb_queue *queue, struct napi_struct *napi,
>  		macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
>  
>  		macb_init_rx_ring(queue);
> -		queue_writel(queue, RBQP, queue->rx_ring_dma);
> +		queue_writel(queue, RBQP, lower_32_bits(queue->rx_ring_dma));
> +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
> +		if (bp->hw_dma_cap & HW_DMA_CAP_64B)
> +			macb_writel(bp, RBQPH, upper_32_bits(queue->rx_ring_dma));
> +#endif
>  
>  		macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
>  

Looks like a subset of Théo Lebrun's work:
https://lore.kernel.org/all/20250820-macb-fixes-v4-0-23c399429164@bootlin.com/
let's wait for his patches to get merged instead?