linux-kernel - [PATCH 1/2] net/fsl: fman: Allow fm_max_frame_sz & rx_extra

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Date:   Thu, 17 Feb 2022 17:05:26 +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 1/2] net/fsl: fman: Allow fm_max_frame_sz & rx_extra_headroom config from devicetree.

Allow modification of two additional Frame Manager parameters :
- FM Max Frame Size : Can be changed to a value other than 1522
  (ie support Jumbo Frames)
- RX Extra Headroom

Signed-off-by: Fred Lefranc <hardware.evs@...il.com>
---
 drivers/net/ethernet/freescale/fman/fman.c | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/net/ethernet/freescale/fman/fman.c b/drivers/net/ethernet/freescale/fman/fman.c
index 8f0db61cb1f6..bf4240eacf42 100644
--- a/drivers/net/ethernet/freescale/fman/fman.c
+++ b/drivers/net/ethernet/freescale/fman/fman.c
@@ -2862,6 +2862,32 @@ static struct fman *read_dts_node(struct platform_device *of_dev)
 		of_property_read_bool(fm_node, "fsl,erratum-a050385");
 #endif
 
+	/* Get Max Frame Size */
+	err = of_property_read_u32(fm_node, "fsl,max-frm-sz", &val);
+	if (!err) {
+		if (val > FSL_FM_MAX_POSSIBLE_FRAME_SIZE)
+			fsl_fm_max_frm = FSL_FM_MAX_POSSIBLE_FRAME_SIZE;
+		else if (val < FSL_FM_MIN_POSSIBLE_FRAME_SIZE)
+			fsl_fm_max_frm = FSL_FM_MIN_POSSIBLE_FRAME_SIZE;
+		else
+			fsl_fm_max_frm = (int)val;
+	}
+	dev_dbg(&of_dev->dev, "Configured Max Frame Size: %d\n",
+		fsl_fm_max_frm);
+
+	/* Get RX Extra Headroom Value */
+	err = of_property_read_u32(fm_node, "fsl,rx-extra-headroom", &val);
+	if (!err) {
+		if (val > FSL_FM_RX_EXTRA_HEADROOM_MAX)
+			fsl_fm_rx_extra_headroom = FSL_FM_RX_EXTRA_HEADROOM_MAX;
+		else if (val < FSL_FM_RX_EXTRA_HEADROOM_MIN)
+			fsl_fm_rx_extra_headroom = FSL_FM_RX_EXTRA_HEADROOM_MIN;
+		else
+			fsl_fm_rx_extra_headroom = (int)val;
+	}
+	dev_dbg(&of_dev->dev, "Configured RX Extra Headroom: %d\n",
+		fsl_fm_rx_extra_headroom);
+
 	return fman;
 
 fman_node_put:
-- 
2.25.1