linux-kernel - [PATCH 2/2] net/fsl: fman dt binding: add fsl,max-frm-sz & fsl,rx-extra-headroom properties.

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Date:   Thu, 17 Feb 2022 17:05:27 +0100
From:   Fred Lefranc <hardware.evs@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Fred Lefranc <hardware.evs@...il.com>,
        Madalin Bucur <madalin.bucur@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] net/fsl: fman dt binding: add fsl,max-frm-sz & fsl,rx-extra-headroom properties.

Describes two additional parameters that could be optionally added
in devicetree.

Signed-off-by: Fred Lefranc <hardware.evs@...il.com>
---
 .../devicetree/bindings/net/fsl-fman.txt      | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/fsl-fman.txt b/Documentation/devicetree/bindings/net/fsl-fman.txt
index 020337f3c05f..bcd0cf8ca9e9 100644
--- a/Documentation/devicetree/bindings/net/fsl-fman.txt
+++ b/Documentation/devicetree/bindings/net/fsl-fman.txt
@@ -117,6 +117,26 @@ PROPERTIES
 		erratum A050385 which indicates that DMA transactions that are
 		split can result in a FMan lock.
 
+- fsl,max-frm-sz
+		Usage: optional
+		Value type: <u32>
+		Definition: Max frame size, across all interfaces.
+ 		Must be large enough to accommodate the network MTU, but small enough
+ 		to avoid wasting skb memory.
+		1522 by default.
+
+- fsl,rx-extra-headroom
+		Usage: optional
+		Value type: <u32>
+		Definition: Extra headroom for Rx buffers.
+ 		FMan is instructed to allocate, on the Rx path, this amount of
+		space at the beginning of a data buffer, beside the DPA private
+		data area and the IC fields.
+		Does not impact Tx buffer layout.
+		64 by default, it's needed on
+		particular forwarding scenarios that add extra headers to the
+		forwarded frame.
+
 =============================================================================
 FMan MURAM Node
 
-- 
2.25.1