linux-kernel - Re: [PATCH net-next v2 2/2] net: macb: Add support for partial store and forward

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Message-ID: <3a3c6241-2134-42d0-8dd3-0c96d8e7300b@lunn.ch>
Date:   Thu, 11 May 2023 17:49:10 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Pranavi Somisetty <pranavi.somisetty@....com>
Cc:     nicolas.ferre@...rochip.com, claudiu.beznea@...rochip.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, richardcochran@...il.com, linux@...linux.org.uk,
        palmer@...belt.com, git@....com, michal.simek@....com,
        harini.katakam@....com, radhey.shyam.pandey@....com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH net-next v2 2/2] net: macb: Add support for partial store
 and forward

> +	if (GEM_BFEXT(PBUF_CUTTHRU, gem_readl(bp, DCFG6))) {
> +		if (bp->caps & MACB_CAPS_PARTIAL_STORE_FORWARD) {
> +			retval = of_property_read_u16(bp->pdev->dev.of_node,
> +						      "rx-watermark",
> +						      &bp->rx_watermark);
> +
> +			/* Disable partial store and forward in case of error or
> +			 * invalid watermark value
> +			 */
> +			wtrmrk_rst_val = (1 << (GEM_BFEXT(RX_PBUF_ADDR, gem_readl(bp, DCFG2)))) - 1;
> +			if (retval || bp->rx_watermark > wtrmrk_rst_val || !bp->rx_watermark) {
> +				if (bp->rx_watermark > wtrmrk_rst_val) {
> +					dev_info(&bp->pdev->dev, "Invalid watermark value\n");
> +					bp->rx_watermark = 0;

Please return -EINVAL. We want the DT author to fix their error.

> +				}
> +				dev_info(&bp->pdev->dev, "Not enabling partial store and forward\n");

The DT property is optional? So when it is missing, retval will be
-EINVAL. Please don't spam the logs in this case.

	 Andrew