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openwrt/target/linux/qualcommbe/patches-6.18/0326-net-ethernet-qualcomm-Initialize-PPE-buffer-manageme.patch
Alexandru Gagniuc 0efbee297a qualcommbe: create files for v6.18 from v6.12 
Create the config and relevant patches for 6.18 from 6.12. The
"standard" openwrt devel process seems to be to move the files and
restore the old ones. I find this process confusing, and I don't see
any git benefits for doing things this way. So just copy the files.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21506
Signed-off-by: Robert Marko <robimarko@gmail.com>
2026-05-28 10:15:20 +02:00

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From 6e639ab45348ee7a697db8b481fa6f8555280f58 Mon Sep 17 00:00:00 2001
From: Luo Jie <quic_luoj@quicinc.com>
Date: Sun, 9 Feb 2025 22:29:38 +0800
Subject: [PATCH] net: ethernet: qualcomm: Initialize PPE buffer management for
IPQ9574
The BM (Buffer Management) config controls the pause frame generated
on the PPE port. There are maximum 15 BM ports and 4 groups supported,
all BM ports are assigned to group 0 by default. The number of hardware
buffers configured for the port influence the threshold of the flow
control for that port.
Signed-off-by: Luo Jie <quic_luoj@quicinc.com>
---
drivers/net/ethernet/qualcomm/ppe/Makefile | 2 +-
drivers/net/ethernet/qualcomm/ppe/ppe.c | 5 +
.../net/ethernet/qualcomm/ppe/ppe_config.c | 195 ++++++++++++++++++
.../net/ethernet/qualcomm/ppe/ppe_config.h | 12 ++
drivers/net/ethernet/qualcomm/ppe/ppe_regs.h | 59 ++++++
5 files changed, 272 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/ethernet/qualcomm/ppe/ppe_config.c
create mode 100644 drivers/net/ethernet/qualcomm/ppe/ppe_config.h
create mode 100644 drivers/net/ethernet/qualcomm/ppe/ppe_regs.h
--- a/drivers/net/ethernet/qualcomm/ppe/Makefile
+++ b/drivers/net/ethernet/qualcomm/ppe/Makefile
@@ -4,4 +4,4 @@
#
obj-$(CONFIG_QCOM_PPE) += qcom-ppe.o
-qcom-ppe-objs := ppe.o
+qcom-ppe-objs := ppe.o ppe_config.o
--- a/drivers/net/ethernet/qualcomm/ppe/ppe.c
+++ b/drivers/net/ethernet/qualcomm/ppe/ppe.c
@@ -15,6 +15,7 @@
#include <linux/reset.h>
#include "ppe.h"
+#include "ppe_config.h"
#define PPE_PORT_MAX 8
#define PPE_CLK_RATE 353000000
@@ -194,6 +195,10 @@ static int qcom_ppe_probe(struct platfor
if (ret)
return dev_err_probe(dev, ret, "PPE clock config failed\n");
+ ret = ppe_hw_config(ppe_dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "PPE HW config failed\n");
+
platform_set_drvdata(pdev, ppe_dev);
return 0;
--- /dev/null
+++ b/drivers/net/ethernet/qualcomm/ppe/ppe_config.c
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+/* PPE HW initialization configs such as BM(buffer management),
+ * QM(queue management) and scheduler configs.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+
+#include "ppe.h"
+#include "ppe_config.h"
+#include "ppe_regs.h"
+
+/**
+ * struct ppe_bm_port_config - PPE BM port configuration.
+ * @port_id_start: The fist BM port ID to configure.
+ * @port_id_end: The last BM port ID to configure.
+ * @pre_alloc: BM port dedicated buffer number.
+ * @in_fly_buf: Buffer number for receiving the packet after pause frame sent.
+ * @ceil: Ceil to generate the back pressure.
+ * @weight: Weight value.
+ * @resume_offset: Resume offset from the threshold value.
+ * @resume_ceil: Ceil to resume from the back pressure state.
+ * @dynamic: Dynamic threshold used or not.
+ *
+ * The is for configuring the threshold that impacts the port
+ * flow control.
+ */
+struct ppe_bm_port_config {
+ unsigned int port_id_start;
+ unsigned int port_id_end;
+ unsigned int pre_alloc;
+ unsigned int in_fly_buf;
+ unsigned int ceil;
+ unsigned int weight;
+ unsigned int resume_offset;
+ unsigned int resume_ceil;
+ bool dynamic;
+};
+
+/* Assign the share buffer number 1550 to group 0 by default. */
+static const int ipq9574_ppe_bm_group_config = 1550;
+
+/* The buffer configurations per PPE port. There are 15 BM ports and
+ * 4 BM groups supported by PPE. BM port (0-7) is for EDMA port 0,
+ * BM port (8-13) is for PPE physical port 1-6 and BM port 14 is for
+ * EIP port.
+ */
+static const struct ppe_bm_port_config ipq9574_ppe_bm_port_config[] = {
+ {
+ /* Buffer configuration for the BM port ID 0 of EDMA. */
+ .port_id_start = 0,
+ .port_id_end = 0,
+ .pre_alloc = 0,
+ .in_fly_buf = 100,
+ .ceil = 1146,
+ .weight = 7,
+ .resume_offset = 8,
+ .resume_ceil = 0,
+ .dynamic = true,
+ },
+ {
+ /* Buffer configuration for the BM port ID 1-7 of EDMA. */
+ .port_id_start = 1,
+ .port_id_end = 7,
+ .pre_alloc = 0,
+ .in_fly_buf = 100,
+ .ceil = 250,
+ .weight = 4,
+ .resume_offset = 36,
+ .resume_ceil = 0,
+ .dynamic = true,
+ },
+ {
+ /* Buffer configuration for the BM port ID 8-13 of PPE ports. */
+ .port_id_start = 8,
+ .port_id_end = 13,
+ .pre_alloc = 0,
+ .in_fly_buf = 128,
+ .ceil = 250,
+ .weight = 4,
+ .resume_offset = 36,
+ .resume_ceil = 0,
+ .dynamic = true,
+ },
+ {
+ /* Buffer configuration for the BM port ID 14 of EIP. */
+ .port_id_start = 14,
+ .port_id_end = 14,
+ .pre_alloc = 0,
+ .in_fly_buf = 40,
+ .ceil = 250,
+ .weight = 4,
+ .resume_offset = 36,
+ .resume_ceil = 0,
+ .dynamic = true,
+ },
+};
+
+static int ppe_config_bm_threshold(struct ppe_device *ppe_dev, int bm_port_id,
+ const struct ppe_bm_port_config port_cfg)
+{
+ u32 reg, val, bm_fc_val[2];
+ int ret;
+
+ reg = PPE_BM_PORT_FC_CFG_TBL_ADDR + PPE_BM_PORT_FC_CFG_TBL_INC * bm_port_id;
+ ret = regmap_bulk_read(ppe_dev->regmap, reg,
+ bm_fc_val, ARRAY_SIZE(bm_fc_val));
+ if (ret)
+ return ret;
+
+ /* Configure BM flow control related threshold. */
+ PPE_BM_PORT_FC_SET_WEIGHT(bm_fc_val, port_cfg.weight);
+ PPE_BM_PORT_FC_SET_RESUME_OFFSET(bm_fc_val, port_cfg.resume_offset);
+ PPE_BM_PORT_FC_SET_RESUME_THRESHOLD(bm_fc_val, port_cfg.resume_ceil);
+ PPE_BM_PORT_FC_SET_DYNAMIC(bm_fc_val, port_cfg.dynamic);
+ PPE_BM_PORT_FC_SET_REACT_LIMIT(bm_fc_val, port_cfg.in_fly_buf);
+ PPE_BM_PORT_FC_SET_PRE_ALLOC(bm_fc_val, port_cfg.pre_alloc);
+
+ /* Configure low/high bits of the ceiling for the BM port. */
+ val = FIELD_GET(GENMASK(2, 0), port_cfg.ceil);
+ PPE_BM_PORT_FC_SET_CEILING_LOW(bm_fc_val, val);
+ val = FIELD_GET(GENMASK(10, 3), port_cfg.ceil);
+ PPE_BM_PORT_FC_SET_CEILING_HIGH(bm_fc_val, val);
+
+ ret = regmap_bulk_write(ppe_dev->regmap, reg,
+ bm_fc_val, ARRAY_SIZE(bm_fc_val));
+ if (ret)
+ return ret;
+
+ /* Assign the default group ID 0 to the BM port. */
+ val = FIELD_PREP(PPE_BM_PORT_GROUP_ID_SHARED_GROUP_ID, 0);
+ reg = PPE_BM_PORT_GROUP_ID_ADDR + PPE_BM_PORT_GROUP_ID_INC * bm_port_id;
+ ret = regmap_update_bits(ppe_dev->regmap, reg,
+ PPE_BM_PORT_GROUP_ID_SHARED_GROUP_ID,
+ val);
+ if (ret)
+ return ret;
+
+ /* Enable BM port flow control. */
+ reg = PPE_BM_PORT_FC_MODE_ADDR + PPE_BM_PORT_FC_MODE_INC * bm_port_id;
+
+ return regmap_set_bits(ppe_dev->regmap, reg, PPE_BM_PORT_FC_MODE_EN);
+}
+
+/* Configure the buffer threshold for the port flow control function. */
+static int ppe_config_bm(struct ppe_device *ppe_dev)
+{
+ const struct ppe_bm_port_config *port_cfg;
+ unsigned int i, bm_port_id, port_cfg_cnt;
+ u32 reg, val;
+ int ret;
+
+ /* Configure the allocated buffer number only for group 0.
+ * The buffer number of group 1-3 is already cleared to 0
+ * after PPE reset during the probe of PPE driver.
+ */
+ reg = PPE_BM_SHARED_GROUP_CFG_ADDR;
+ val = FIELD_PREP(PPE_BM_SHARED_GROUP_CFG_SHARED_LIMIT,
+ ipq9574_ppe_bm_group_config);
+ ret = regmap_update_bits(ppe_dev->regmap, reg,
+ PPE_BM_SHARED_GROUP_CFG_SHARED_LIMIT,
+ val);
+ if (ret)
+ goto bm_config_fail;
+
+ /* Configure buffer thresholds for the BM ports. */
+ port_cfg = ipq9574_ppe_bm_port_config;
+ port_cfg_cnt = ARRAY_SIZE(ipq9574_ppe_bm_port_config);
+ for (i = 0; i < port_cfg_cnt; i++) {
+ for (bm_port_id = port_cfg[i].port_id_start;
+ bm_port_id <= port_cfg[i].port_id_end; bm_port_id++) {
+ ret = ppe_config_bm_threshold(ppe_dev, bm_port_id,
+ port_cfg[i]);
+ if (ret)
+ goto bm_config_fail;
+ }
+ }
+
+ return 0;
+
+bm_config_fail:
+ dev_err(ppe_dev->dev, "PPE BM config error %d\n", ret);
+ return ret;
+}
+
+int ppe_hw_config(struct ppe_device *ppe_dev)
+{
+ return ppe_config_bm(ppe_dev);
+}
--- /dev/null
+++ b/drivers/net/ethernet/qualcomm/ppe/ppe_config.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2025 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __PPE_CONFIG_H__
+#define __PPE_CONFIG_H__
+
+#include "ppe.h"
+
+int ppe_hw_config(struct ppe_device *ppe_dev);
+#endif
--- /dev/null
+++ b/drivers/net/ethernet/qualcomm/ppe/ppe_regs.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2025 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+/* PPE hardware register and table declarations. */
+#ifndef __PPE_REGS_H__
+#define __PPE_REGS_H__
+
+#include <linux/bitfield.h>
+
+/* There are 15 BM ports and 4 BM groups supported by PPE.
+ * BM port (0-7) is for EDMA port 0, BM port (8-13) is for
+ * PPE physical port 1-6 and BM port 14 is for EIP port.
+ */
+#define PPE_BM_PORT_FC_MODE_ADDR 0x600100
+#define PPE_BM_PORT_FC_MODE_ENTRIES 15
+#define PPE_BM_PORT_FC_MODE_INC 0x4
+#define PPE_BM_PORT_FC_MODE_EN BIT(0)
+
+#define PPE_BM_PORT_GROUP_ID_ADDR 0x600180
+#define PPE_BM_PORT_GROUP_ID_ENTRIES 15
+#define PPE_BM_PORT_GROUP_ID_INC 0x4
+#define PPE_BM_PORT_GROUP_ID_SHARED_GROUP_ID GENMASK(1, 0)
+
+#define PPE_BM_SHARED_GROUP_CFG_ADDR 0x600290
+#define PPE_BM_SHARED_GROUP_CFG_ENTRIES 4
+#define PPE_BM_SHARED_GROUP_CFG_INC 0x4
+#define PPE_BM_SHARED_GROUP_CFG_SHARED_LIMIT GENMASK(10, 0)
+
+#define PPE_BM_PORT_FC_CFG_TBL_ADDR 0x601000
+#define PPE_BM_PORT_FC_CFG_TBL_ENTRIES 15
+#define PPE_BM_PORT_FC_CFG_TBL_INC 0x10
+#define PPE_BM_PORT_FC_W0_REACT_LIMIT GENMASK(8, 0)
+#define PPE_BM_PORT_FC_W0_RESUME_THRESHOLD GENMASK(17, 9)
+#define PPE_BM_PORT_FC_W0_RESUME_OFFSET GENMASK(28, 18)
+#define PPE_BM_PORT_FC_W0_CEILING_LOW GENMASK(31, 29)
+#define PPE_BM_PORT_FC_W1_CEILING_HIGH GENMASK(7, 0)
+#define PPE_BM_PORT_FC_W1_WEIGHT GENMASK(10, 8)
+#define PPE_BM_PORT_FC_W1_DYNAMIC BIT(11)
+#define PPE_BM_PORT_FC_W1_PRE_ALLOC GENMASK(22, 12)
+
+#define PPE_BM_PORT_FC_SET_REACT_LIMIT(tbl_cfg, value) \
+ u32p_replace_bits((u32 *)tbl_cfg, value, PPE_BM_PORT_FC_W0_REACT_LIMIT)
+#define PPE_BM_PORT_FC_SET_RESUME_THRESHOLD(tbl_cfg, value) \
+ u32p_replace_bits((u32 *)tbl_cfg, value, PPE_BM_PORT_FC_W0_RESUME_THRESHOLD)
+#define PPE_BM_PORT_FC_SET_RESUME_OFFSET(tbl_cfg, value) \
+ u32p_replace_bits((u32 *)tbl_cfg, value, PPE_BM_PORT_FC_W0_RESUME_OFFSET)
+#define PPE_BM_PORT_FC_SET_CEILING_LOW(tbl_cfg, value) \
+ u32p_replace_bits((u32 *)tbl_cfg, value, PPE_BM_PORT_FC_W0_CEILING_LOW)
+#define PPE_BM_PORT_FC_SET_CEILING_HIGH(tbl_cfg, value) \
+ u32p_replace_bits((u32 *)(tbl_cfg) + 0x1, value, PPE_BM_PORT_FC_W1_CEILING_HIGH)
+#define PPE_BM_PORT_FC_SET_WEIGHT(tbl_cfg, value) \
+ u32p_replace_bits((u32 *)(tbl_cfg) + 0x1, value, PPE_BM_PORT_FC_W1_WEIGHT)
+#define PPE_BM_PORT_FC_SET_DYNAMIC(tbl_cfg, value) \
+ u32p_replace_bits((u32 *)(tbl_cfg) + 0x1, value, PPE_BM_PORT_FC_W1_DYNAMIC)
+#define PPE_BM_PORT_FC_SET_PRE_ALLOC(tbl_cfg, value) \
+ u32p_replace_bits((u32 *)(tbl_cfg) + 0x1, value, PPE_BM_PORT_FC_W1_PRE_ALLOC)
+#endif
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