linux-kernel - Re: [PATCH net-next v2 1/2] dt-bindings: net: cdns,macb: Add rx-watermark property

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Message-ID: <5872254a-7a33-4aa5-afa3-50ad5d8c7002@lunn.ch>
Date:   Thu, 11 May 2023 17:41:19 +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 1/2] dt-bindings: net: cdns,macb: Add
 rx-watermark property

On Thu, May 11, 2023 at 01:12:13AM -0600, Pranavi Somisetty wrote:
> watermark value is the minimum amount of packet data
> required to activate the forwarding process. The watermark
> implementation and maximum size is dependent on the device
> where Cadence MACB/GEM is used.
> 
> Signed-off-by: Pranavi Somisetty <pranavi.somisetty@....com>
> ---
>  Documentation/devicetree/bindings/net/cdns,macb.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/cdns,macb.yaml b/Documentation/devicetree/bindings/net/cdns,macb.yaml
> index bef5e0f895be..779bc25cf005 100644
> --- a/Documentation/devicetree/bindings/net/cdns,macb.yaml
> +++ b/Documentation/devicetree/bindings/net/cdns,macb.yaml
> @@ -109,6 +109,13 @@ properties:
>    power-domains:
>      maxItems: 1
>  
> +  rx-watermark:
> +    maxItems: 1
> +    $ref: /schemas/types.yaml#/definitions/uint16
> +    description:
> +      Set watermark value for pbuf_rxcutthru reg and enable
> +      rx partial store and forward.

What are the units? Frames, octets, DMA scatter-gather segments, % of
maximum?

	Andrew

---
pw-bot: cr