openwrtv4/target/linux/mediatek/patches-4.9/0026-net-mediatek-backport-v4.10-driver.patch

From 99d9d02a05df503184be094de336e7515fe3e235 Mon Sep 17 00:00:00 2001
From: John Crispin <john@phrozen.org>
Date: Thu, 10 Aug 2017 14:26:29 +0200
Subject: [PATCH 26/57] net: mediatek: backport v4.10 driver

Signed-off-by: John Crispin <john@phrozen.org>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c        |  49 ++-
 drivers/net/ethernet/mediatek/mtk_eth_soc.h        |  16 +-
 drivers/net/ethernet/mediatek/mtk_hnat/Makefile    |   4 +
 drivers/net/ethernet/mediatek/mtk_hnat/hnat.c      | 315 +++++++++++++++
 drivers/net/ethernet/mediatek/mtk_hnat/hnat.h      | 425 +++++++++++++++++++++
 .../net/ethernet/mediatek/mtk_hnat/hnat_debugfs.c  | 259 +++++++++++++
 .../net/ethernet/mediatek/mtk_hnat/hnat_nf_hook.c  | 289 ++++++++++++++
 .../net/ethernet/mediatek/mtk_hnat/nf_hnat_mtk.h   |  44 +++
 8 files changed, 1378 insertions(+), 23 deletions(-)
 create mode 100644 drivers/net/ethernet/mediatek/mtk_hnat/Makefile
 create mode 100644 drivers/net/ethernet/mediatek/mtk_hnat/hnat.c
 create mode 100644 drivers/net/ethernet/mediatek/mtk_hnat/hnat.h
 create mode 100644 drivers/net/ethernet/mediatek/mtk_hnat/hnat_debugfs.c
 create mode 100644 drivers/net/ethernet/mediatek/mtk_hnat/hnat_nf_hook.c
 create mode 100644 drivers/net/ethernet/mediatek/mtk_hnat/nf_hnat_mtk.h

--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -462,8 +462,8 @@ static void mtk_stats_update(struct mtk_
 	}
 }
 
-static struct rtnl_link_stats64 *mtk_get_stats64(struct net_device *dev,
-					struct rtnl_link_stats64 *storage)
+static struct rtnl_link_stats64 * mtk_get_stats64(struct net_device *dev,
+			    struct rtnl_link_stats64 *storage)
 {
 	struct mtk_mac *mac = netdev_priv(dev);
 	struct mtk_hw_stats *hw_stats = mac->hw_stats;
@@ -615,7 +615,7 @@ static int mtk_tx_map(struct sk_buff *sk
 	struct mtk_mac *mac = netdev_priv(dev);
 	struct mtk_eth *eth = mac->hw;
 	struct mtk_tx_dma *itxd, *txd;
-	struct mtk_tx_buf *tx_buf;
+	struct mtk_tx_buf *itx_buf, *tx_buf;
 	dma_addr_t mapped_addr;
 	unsigned int nr_frags;
 	int i, n_desc = 1;
@@ -629,8 +629,8 @@ static int mtk_tx_map(struct sk_buff *sk
 	fport = (mac->id + 1) << TX_DMA_FPORT_SHIFT;
 	txd4 |= fport;
 
-	tx_buf = mtk_desc_to_tx_buf(ring, itxd);
-	memset(tx_buf, 0, sizeof(*tx_buf));
+	itx_buf = mtk_desc_to_tx_buf(ring, itxd);
+	memset(itx_buf, 0, sizeof(*itx_buf));
 
 	if (gso)
 		txd4 |= TX_DMA_TSO;
@@ -649,9 +649,11 @@ static int mtk_tx_map(struct sk_buff *sk
 		return -ENOMEM;
 
 	WRITE_ONCE(itxd->txd1, mapped_addr);
-	tx_buf->flags |= MTK_TX_FLAGS_SINGLE0;
-	dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
-	dma_unmap_len_set(tx_buf, dma_len0, skb_headlen(skb));
+	itx_buf->flags |= MTK_TX_FLAGS_SINGLE0;
+	itx_buf->flags |= (!mac->id) ? MTK_TX_FLAGS_FPORT0 :
+			  MTK_TX_FLAGS_FPORT1;
+	dma_unmap_addr_set(itx_buf, dma_addr0, mapped_addr);
+	dma_unmap_len_set(itx_buf, dma_len0, skb_headlen(skb));
 
 	/* TX SG offload */
 	txd = itxd;
@@ -687,11 +689,13 @@ static int mtk_tx_map(struct sk_buff *sk
 					       last_frag * TX_DMA_LS0));
 			WRITE_ONCE(txd->txd4, fport);
 
-			tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;
 			tx_buf = mtk_desc_to_tx_buf(ring, txd);
 			memset(tx_buf, 0, sizeof(*tx_buf));
-
+			tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;
 			tx_buf->flags |= MTK_TX_FLAGS_PAGE0;
+			tx_buf->flags |= (!mac->id) ? MTK_TX_FLAGS_FPORT0 :
+					 MTK_TX_FLAGS_FPORT1;
+
 			dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
 			dma_unmap_len_set(tx_buf, dma_len0, frag_map_size);
 			frag_size -= frag_map_size;
@@ -700,7 +704,7 @@ static int mtk_tx_map(struct sk_buff *sk
 	}
 
 	/* store skb to cleanup */
-	tx_buf->skb = skb;
+	itx_buf->skb = skb;
 
 	WRITE_ONCE(itxd->txd4, txd4);
 	WRITE_ONCE(itxd->txd3, (TX_DMA_SWC | TX_DMA_PLEN0(skb_headlen(skb)) |
@@ -845,7 +849,7 @@ static int mtk_start_xmit(struct sk_buff
 drop:
 	spin_unlock(&eth->page_lock);
 	stats->tx_dropped++;
-	dev_kfree_skb(skb);
+	dev_kfree_skb_any(skb);
 	return NETDEV_TX_OK;
 }
 
@@ -1014,17 +1018,16 @@ static int mtk_poll_tx(struct mtk_eth *e
 
 	while ((cpu != dma) && budget) {
 		u32 next_cpu = desc->txd2;
-		int mac;
+		int mac = 0;
 
 		desc = mtk_qdma_phys_to_virt(ring, desc->txd2);
 		if ((desc->txd3 & TX_DMA_OWNER_CPU) == 0)
 			break;
 
-		mac = (desc->txd4 >> TX_DMA_FPORT_SHIFT) &
-		       TX_DMA_FPORT_MASK;
-		mac--;
-
 		tx_buf = mtk_desc_to_tx_buf(ring, desc);
+		if (tx_buf->flags & MTK_TX_FLAGS_FPORT1)
+			mac = 1;
+
 		skb = tx_buf->skb;
 		if (!skb) {
 			condition = 1;
@@ -1848,6 +1851,12 @@ static int mtk_hw_init(struct mtk_eth *e
 	/* GE2, Force 1000M/FD, FC ON */
 	mtk_w32(eth, MAC_MCR_FIXED_LINK, MTK_MAC_MCR(1));
 
+	/* Indicates CDM to parse the MTK special tag from CPU
+	 * which also is working out for untag packets.
+	 */
+	val = mtk_r32(eth, MTK_CDMQ_IG_CTRL);
+	mtk_w32(eth, val | MTK_CDMQ_STAG_EN, MTK_CDMQ_IG_CTRL);
+
 	/* Enable RX VLan Offloading */
 	mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
 
@@ -1910,10 +1919,9 @@ static int __init mtk_init(struct net_de
 
 	/* If the mac address is invalid, use random mac address  */
 	if (!is_valid_ether_addr(dev->dev_addr)) {
-		random_ether_addr(dev->dev_addr);
+		eth_hw_addr_random(dev);
 		dev_err(eth->dev, "generated random MAC address %pM\n",
 			dev->dev_addr);
-		dev->addr_assign_type = NET_ADDR_RANDOM;
 	}
 
 	return mtk_phy_connect(dev);
@@ -2247,7 +2255,6 @@ static const struct net_device_ops mtk_n
 	.ndo_set_mac_address	= mtk_set_mac_address,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_do_ioctl		= mtk_do_ioctl,
-	.ndo_change_mtu		= eth_change_mtu,
 	.ndo_tx_timeout		= mtk_tx_timeout,
 	.ndo_get_stats64        = mtk_get_stats64,
 	.ndo_fix_features	= mtk_fix_features,
@@ -2320,6 +2327,8 @@ static int mtk_add_mac(struct mtk_eth *e
 	eth->netdev[id]->ethtool_ops = &mtk_ethtool_ops;
 
 	eth->netdev[id]->irq = eth->irq[0];
+	eth->netdev[id]->dev.of_node = np;
+
 	return 0;
 
 free_netdev:
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -70,6 +70,10 @@
 /* Frame Engine Interrupt Grouping Register */
 #define MTK_FE_INT_GRP		0x20
 
+/* CDMP Ingress Control Register */
+#define MTK_CDMQ_IG_CTRL	0x1400
+#define MTK_CDMQ_STAG_EN	BIT(0)
+
 /* CDMP Exgress Control Register */
 #define MTK_CDMP_EG_CTRL	0x404
 
@@ -406,12 +410,18 @@ struct mtk_hw_stats {
 	struct u64_stats_sync	syncp;
 };
 
-/* PDMA descriptor can point at 1-2 segments. This enum allows us to track how
- * memory was allocated so that it can be freed properly
- */
 enum mtk_tx_flags {
+	/* PDMA descriptor can point at 1-2 segments. This enum allows us to
+	 * track how memory was allocated so that it can be freed properly.
+	 */
 	MTK_TX_FLAGS_SINGLE0	= 0x01,
 	MTK_TX_FLAGS_PAGE0	= 0x02,
+
+	/* MTK_TX_FLAGS_FPORTx allows tracking which port the transmitted
+	 * SKB out instead of looking up through hardware TX descriptor.
+	 */
+	MTK_TX_FLAGS_FPORT0	= 0x04,
+	MTK_TX_FLAGS_FPORT1	= 0x08,
 };
 
 /* This enum allows us to identify how the clock is defined on the array of the
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/mtk_hnat/Makefile
@@ -0,0 +1,4 @@
+ccflags-y=-Werror
+
+obj-$(CONFIG_NET_MEDIATEK_HNAT)         += mtkhnat.o
+mtkhnat-objs := hnat.o hnat_nf_hook.o hnat_debugfs.o
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/mtk_hnat/hnat.c
@@ -0,0 +1,315 @@
+/*   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; version 2 of the License
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   Copyright (C) 2014-2016 Sean Wang <sean.wang@mediatek.com>
+ *   Copyright (C) 2016-2017 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/if.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include "hnat.h"
+
+struct hnat_priv *host;
+
+static void cr_set_bits(void __iomem * reg, u32 bs)
+{
+	u32 val = readl(reg);
+
+	val |= bs;
+	writel(val, reg);
+}
+
+static void cr_clr_bits(void __iomem * reg, u32 bs)
+{
+	u32 val = readl(reg);
+
+	val &= ~bs;
+	writel(val, reg);
+}
+
+static void cr_set_field(void __iomem * reg, u32 field, u32 val)
+{
+	unsigned int tv = readl(reg);
+
+	tv &= ~field;
+	tv |= ((val) << (ffs((unsigned int)field) - 1));
+	writel(tv, reg);
+}
+
+static int hnat_start(void)
+{
+	u32 foe_table_sz;
+
+	/* mapp the FOE table */
+	foe_table_sz = FOE_4TB_SIZ * sizeof(struct foe_entry);
+	host->foe_table_cpu =
+	    dma_alloc_coherent(host->dev, foe_table_sz, &host->foe_table_dev,
+			       GFP_KERNEL);
+	if (!host->foe_table_cpu)
+		return -1;
+
+	writel(host->foe_table_dev, host->ppe_base + PPE_TB_BASE);
+	memset(host->foe_table_cpu, 0, foe_table_sz);
+
+	/* setup hashing */
+	cr_set_field(host->ppe_base + PPE_TB_CFG, TB_ETRY_NUM, TABLE_4K);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, HASH_MODE, HASH_MODE_1);
+	writel(HASH_SEED_KEY, host->ppe_base + PPE_HASH_SEED);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, XMODE, 0);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, TB_ENTRY_SIZE, ENTRY_64B);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, SMA, SMA_FWD_CPU_BUILD_ENTRY);
+
+	/* set ip proto */
+	writel(0xFFFFFFFF, host->ppe_base + PPE_IP_PROT_CHK);
+
+	/* setup caching */
+	cr_set_field(host->ppe_base + PPE_CAH_CTRL, CAH_X_MODE, 1);
+	cr_set_field(host->ppe_base + PPE_CAH_CTRL, CAH_X_MODE, 0);
+	cr_set_field(host->ppe_base + PPE_CAH_CTRL, CAH_EN, 1);
+
+	/* enable FOE */
+	cr_set_bits(host->ppe_base + PPE_FLOW_CFG,
+			    BIT_IPV4_NAT_EN | BIT_IPV4_NAPT_EN |
+			    BIT_IPV4_NAT_FRAG_EN | BIT_IPV4_HASH_GREK);
+
+	/* setup FOE aging */
+	cr_set_field(host->ppe_base + PPE_TB_CFG, NTU_AGE, 1);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, UNBD_AGE, 1);
+	cr_set_field(host->ppe_base + PPE_UNB_AGE, UNB_MNP, 1000);
+	cr_set_field(host->ppe_base + PPE_UNB_AGE, UNB_DLTA, 3);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, TCP_AGE, 1);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, UDP_AGE, 1);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, FIN_AGE, 1);
+	cr_set_field(host->ppe_base + PPE_BND_AGE_0, UDP_DLTA, 5);
+	cr_set_field(host->ppe_base + PPE_BND_AGE_0, NTU_DLTA, 5);
+	cr_set_field(host->ppe_base + PPE_BND_AGE_1, FIN_DLTA, 5);
+	cr_set_field(host->ppe_base + PPE_BND_AGE_1, TCP_DLTA, 5);
+
+	/* setup FOE ka */
+	cr_set_field(host->ppe_base + PPE_TB_CFG, KA_CFG, 3);
+	cr_set_field(host->ppe_base + PPE_KA, KA_T, 1);
+	cr_set_field(host->ppe_base + PPE_KA, TCP_KA, 1);
+	cr_set_field(host->ppe_base + PPE_KA, UDP_KA, 1);
+	cr_set_field(host->ppe_base + PPE_BIND_LMT_1, NTU_KA, 1);
+
+	/* setup FOE rate limit */
+	cr_set_field(host->ppe_base + PPE_BIND_LMT_0, QURT_LMT, 16383);
+	cr_set_field(host->ppe_base + PPE_BIND_LMT_0, HALF_LMT, 16383);
+	cr_set_field(host->ppe_base + PPE_BIND_LMT_1, FULL_LMT, 16383);
+	cr_set_field(host->ppe_base + PPE_BNDR, BIND_RATE, 1);
+
+	/* setup FOE cf gen */
+	cr_set_field(host->ppe_base + PPE_GLO_CFG, PPE_EN, 1);
+	writel(0, host->ppe_base + PPE_DFT_CPORT); // pdma
+	//writel(0x55555555, host->ppe_base + PPE_DFT_CPORT); //qdma
+	cr_set_field(host->ppe_base + PPE_GLO_CFG, TTL0_DRP, 1);
+
+	/* fwd packets from gmac to PPE */
+	cr_clr_bits(host->fe_base + GDMA1_FWD_CFG, GDM1_ALL_FRC_MASK);
+	cr_set_bits(host->fe_base + GDMA1_FWD_CFG,
+		    BITS_GDM1_ALL_FRC_P_PPE);
+	cr_clr_bits(host->fe_base + GDMA2_FWD_CFG, GDM2_ALL_FRC_MASK);
+	cr_set_bits(host->fe_base + GDMA2_FWD_CFG,
+		    BITS_GDM2_ALL_FRC_P_PPE);
+
+	dev_info(host->dev, "hwnat start\n");
+
+	return 0;
+}
+
+static int ppe_busy_wait(void)
+{
+	unsigned long t_start = jiffies;
+	u32 r = 0;
+
+	while (1) {
+		r = readl((host->ppe_base + 0x0));
+		if (!(r & BIT(31)))
+			return 0;
+		if (time_after(jiffies, t_start + HZ))
+			break;
+		usleep_range(10, 20);
+	}
+
+	dev_err(host->dev, "ppe:%s timeout\n", __func__);
+
+	return -1;
+}
+
+static void hnat_stop(void)
+{
+	u32 foe_table_sz;
+	struct foe_entry *entry, *end;
+	u32 r1 = 0, r2 = 0;
+
+	/* discard all traffic while we disable the PPE */
+	cr_clr_bits(host->fe_base + GDMA1_FWD_CFG, GDM1_ALL_FRC_MASK);
+	cr_set_bits(host->fe_base + GDMA1_FWD_CFG,
+		    BITS_GDM1_ALL_FRC_P_DISCARD);
+	cr_clr_bits(host->fe_base + GDMA2_FWD_CFG, GDM2_ALL_FRC_MASK);
+	cr_set_bits(host->fe_base + GDMA2_FWD_CFG,
+		    BITS_GDM2_ALL_FRC_P_DISCARD);
+
+	if (ppe_busy_wait()) {
+		reset_control_reset(host->rstc);
+		msleep(2000);
+		return;
+	}
+
+	entry = host->foe_table_cpu;
+        end = host->foe_table_cpu + FOE_4TB_SIZ;
+        while (entry < end) {
+		entry->bfib1.state = INVALID;
+                entry++;
+        }
+
+	/* disable caching */
+	cr_set_field(host->ppe_base + PPE_CAH_CTRL, CAH_X_MODE, 1);
+	cr_set_field(host->ppe_base + PPE_CAH_CTRL, CAH_X_MODE, 0);
+	cr_set_field(host->ppe_base + PPE_CAH_CTRL, CAH_EN, 0);
+
+	/* flush cache has to be ahead of hnat diable --*/
+	cr_set_field(host->ppe_base + PPE_GLO_CFG, PPE_EN, 0);
+
+	/* disable FOE */
+	cr_clr_bits(host->ppe_base + PPE_FLOW_CFG,
+			    BIT_IPV4_NAPT_EN | BIT_IPV4_NAT_EN |
+			    BIT_IPV4_NAT_FRAG_EN |
+			    BIT_FUC_FOE | BIT_FMC_FOE | BIT_FUC_FOE);
+
+	/* disable FOE aging */
+	cr_set_field(host->ppe_base + PPE_TB_CFG, NTU_AGE, 0);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, UNBD_AGE, 0);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, TCP_AGE, 0);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, UDP_AGE, 0);
+	cr_set_field(host->ppe_base + PPE_TB_CFG, FIN_AGE, 0);
+
+	r1 = readl(host->fe_base + 0x100);
+	r2 = readl(host->fe_base + 0x10c);
+
+	dev_info(host->dev, "0x100 = 0x%x, 0x10c = 0x%x\n", r1, r2);
+
+	if (((r1 & 0xff00) >> 0x8) >= (r1 & 0xff) ||
+	    ((r1 & 0xff00) >> 0x8) >= (r2 & 0xff)) {
+		dev_info(host->dev, "reset pse\n");
+		writel(0x1, host->fe_base + 0x4);
+	}
+
+	/* free the FOE table */
+	foe_table_sz = FOE_4TB_SIZ * sizeof(struct foe_entry);
+	dma_free_coherent(NULL, foe_table_sz, host->foe_table_cpu,
+			  host->foe_table_dev);
+	writel(0, host->ppe_base + PPE_TB_BASE);
+
+	if (ppe_busy_wait()) {
+		reset_control_reset(host->rstc);
+		msleep(2000);
+		return;
+	}
+
+	/* send all traffic back to the DMA engine */
+	cr_clr_bits(host->fe_base + GDMA1_FWD_CFG, GDM1_ALL_FRC_MASK);
+	cr_set_bits(host->fe_base + GDMA1_FWD_CFG,
+		    BITS_GDM1_ALL_FRC_P_CPU_PDMA);
+	cr_clr_bits(host->fe_base + GDMA2_FWD_CFG, GDM2_ALL_FRC_MASK);
+	cr_set_bits(host->fe_base + GDMA2_FWD_CFG,
+		    BITS_GDM2_ALL_FRC_P_CPU_PDMA);
+}
+
+static int hnat_probe(struct platform_device *pdev)
+{
+	int err = 0;
+	struct resource *res ;
+	const char *name;
+	struct device_node *np;
+
+	host = devm_kzalloc(&pdev->dev, sizeof(struct hnat_priv), GFP_KERNEL);
+	if (!host)
+		return -ENOMEM;
+
+	host->dev = &pdev->dev;
+	np = host->dev->of_node;
+
+	err = of_property_read_string(np, "mtketh-wan", &name);
+	if (err < 0)
+		return -EINVAL;
+
+	strncpy(host->wan, (char *)name, IFNAMSIZ);
+	dev_info(&pdev->dev, "wan = %s\n", host->wan);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENOENT;
+
+	host->fe_base = devm_ioremap_nocache(&pdev->dev, res->start,
+					     res->end - res->start + 1);
+	if (!host->fe_base)
+		return -EADDRNOTAVAIL;
+
+	host->ppe_base = host->fe_base + 0xe00;
+	err = hnat_init_debugfs(host);
+	if (err)
+		return err;
+
+	host->rstc = devm_reset_control_get(&pdev->dev, NULL);
+	if (IS_ERR(host->rstc))
+		return PTR_ERR(host->rstc);
+
+	err = hnat_start();
+	if (err)
+		goto err_out;
+
+	err = hnat_register_nf_hooks();
+	if (err)
+		goto err_out;
+
+	return 0;
+
+err_out:
+	hnat_stop();
+	hnat_deinit_debugfs(host);
+	return err;
+}
+
+static int hnat_remove(struct platform_device *pdev)
+{
+	hnat_unregister_nf_hooks();
+	hnat_stop();
+	hnat_deinit_debugfs(host);
+
+	return 0;
+}
+
+const struct of_device_id of_hnat_match[] = {
+	{ .compatible = "mediatek,mt7623-hnat" },
+	{},
+};
+
+static struct platform_driver hnat_driver = {
+	.probe = hnat_probe,
+	.remove = hnat_remove,
+	.driver = {
+		.name = "mediatek_soc_hnat",
+		.of_match_table = of_hnat_match,
+	},
+};
+
+module_platform_driver(hnat_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
+MODULE_AUTHOR("John Crispin <john@phrozen.org>");
+MODULE_DESCRIPTION("Mediatek Hardware NAT");
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/mtk_hnat/hnat.h
@@ -0,0 +1,425 @@
+/*   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; version 2 of the License
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   Copyright (C) 2014-2016 Sean Wang <sean.wang@mediatek.com>
+ *   Copyright (C) 2016-2017 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/string.h>
+#include <linux/if.h>
+#include <linux/if_ether.h>
+
+/*--------------------------------------------------------------------------*/
+/* Register Offset*/
+/*--------------------------------------------------------------------------*/
+#define PPE_GLO_CFG		0x00
+#define PPE_FLOW_CFG		0x04
+#define PPE_IP_PROT_CHK		0x08
+#define PPE_IP_PROT_0		0x0C
+#define PPE_IP_PROT_1		0x10
+#define PPE_IP_PROT_2		0x14
+#define PPE_IP_PROT_3		0x18
+#define PPE_TB_CFG		0x1C
+#define PPE_TB_BASE		0x20
+#define PPE_TB_USED		0x24
+#define PPE_BNDR		0x28
+#define PPE_BIND_LMT_0		0x2C
+#define PPE_BIND_LMT_1		0x30
+#define PPE_KA			0x34
+#define PPE_UNB_AGE		0x38
+#define PPE_BND_AGE_0		0x3C
+#define PPE_BND_AGE_1		0x40
+#define PPE_HASH_SEED		0x44
+#define PPE_DFT_CPORT		0x48
+#define PPE_MCAST_PPSE		0x84
+#define PPE_MCAST_L_0		0x88
+#define PPE_MCAST_H_0		0x8C
+#define PPE_MCAST_L_1		0x90
+#define PPE_MCAST_H_1		0x94
+#define PPE_MCAST_L_2		0x98
+#define PPE_MCAST_H_2		0x9C
+#define PPE_MCAST_L_3		0xA0
+#define PPE_MCAST_H_3		0xA4
+#define PPE_MCAST_L_4		0xA8
+#define PPE_MCAST_H_4		0xAC
+#define PPE_MCAST_L_5		0xB0
+#define PPE_MCAST_H_5		0xB4
+#define PPE_MCAST_L_6		0xBC
+#define PPE_MCAST_H_6		0xC0
+#define PPE_MCAST_L_7		0xC4
+#define PPE_MCAST_H_7		0xC8
+#define PPE_MCAST_L_8		0xCC
+#define PPE_MCAST_H_8		0xD0
+#define PPE_MCAST_L_9		0xD4
+#define PPE_MCAST_H_9		0xD8
+#define PPE_MCAST_L_A		0xDC
+#define PPE_MCAST_H_A		0xE0
+#define PPE_MCAST_L_B		0xE4
+#define PPE_MCAST_H_B		0xE8
+#define PPE_MCAST_L_C		0xEC
+#define PPE_MCAST_H_C		0xF0
+#define PPE_MCAST_L_D		0xF4
+#define PPE_MCAST_H_D		0xF8
+#define PPE_MCAST_L_E		0xFC
+#define PPE_MCAST_H_E		0xE0
+#define PPE_MCAST_L_F		0x100
+#define PPE_MCAST_H_F		0x104
+#define PPE_MTU_DRP		0x108
+#define PPE_MTU_VLYR_0		0x10C
+#define PPE_MTU_VLYR_1		0x110
+#define PPE_MTU_VLYR_2		0x114
+#define PPE_VPM_TPID		0x118
+#define PPE_CAH_CTRL		0x120
+#define PPE_CAH_TAG_SRH		0x124
+#define PPE_CAH_LINE_RW		0x128
+#define PPE_CAH_WDATA		0x12C
+#define PPE_CAH_RDATA		0x130
+
+#define GDMA1_FWD_CFG		0x500
+#define GDMA2_FWD_CFG		0x1500
+/*--------------------------------------------------------------------------*/
+/* Register Mask*/
+/*--------------------------------------------------------------------------*/
+/* PPE_TB_CFG mask */
+#define TB_ETRY_NUM		(0x7 << 0)	/* RW */
+#define TB_ENTRY_SIZE		(0x1 << 3)	/* RW */
+#define SMA			(0x3 << 4)		/* RW */
+#define NTU_AGE			(0x1 << 7)	/* RW */
+#define UNBD_AGE		(0x1 << 8)	/* RW */
+#define TCP_AGE			(0x1 << 9)	/* RW */
+#define UDP_AGE			(0x1 << 10)	/* RW */
+#define FIN_AGE			(0x1 << 11)	/* RW */
+#define KA_CFG			(0x3<< 12)
+#define HASH_MODE		(0x3 << 14)	/* RW */
+#define XMODE			(0x3 << 18)	/* RW */
+
+/*PPE_CAH_CTRL mask*/
+#define CAH_EN			(0x1 << 0)	/* RW */
+#define CAH_X_MODE		(0x1 << 9)	/* RW */
+
+/*PPE_UNB_AGE mask*/
+#define UNB_DLTA		(0xff << 0)	/* RW */
+#define UNB_MNP			(0xffff << 16)	/* RW */
+
+/*PPE_BND_AGE_0 mask*/
+#define UDP_DLTA		(0xffff << 0)	/* RW */
+#define NTU_DLTA		(0xffff << 16)	/* RW */
+
+/*PPE_BND_AGE_1 mask*/
+#define TCP_DLTA		(0xffff << 0)	/* RW */
+#define FIN_DLTA		(0xffff << 16)	/* RW */
+
+/*PPE_KA mask*/
+#define KA_T			(0xffff << 0)	/* RW */
+#define TCP_KA			(0xff << 16)	/* RW */
+#define UDP_KA			(0xff << 24)	/* RW */
+
+/*PPE_BIND_LMT_0 mask*/
+#define QURT_LMT		(0x3ff << 0)	/* RW */
+#define HALF_LMT		(0x3ff << 16)	/* RW */
+
+/*PPE_BIND_LMT_1 mask*/
+#define FULL_LMT		(0x3fff << 0)	/* RW */
+#define NTU_KA			(0xff << 16)	/* RW */
+
+/*PPE_BNDR mask*/
+#define BIND_RATE		(0xffff << 0)	/* RW */
+#define PBND_RD_PRD		(0xffff << 16)	/* RW */
+
+/*PPE_GLO_CFG mask*/
+#define PPE_EN			(0x1 << 0)	/* RW */
+#define TTL0_DRP		(0x1 << 4)	/* RW */
+
+/*GDMA1_FWD_CFG mask */
+#define GDM1_UFRC_MASK		(0x7 << 12)	/* RW */
+#define GDM1_BFRC_MASK		(0x7 << 8) /*RW*/
+#define GDM1_MFRC_MASK		(0x7 << 4) /*RW*/
+#define GDM1_OFRC_MASK		(0x7 << 0) /*RW*/
+#define GDM1_ALL_FRC_MASK	(GDM1_UFRC_MASK | GDM1_BFRC_MASK | GDM1_MFRC_MASK | GDM1_OFRC_MASK)
+
+#define GDM2_UFRC_MASK		(0x7 << 12)	/* RW */
+#define GDM2_BFRC_MASK		(0x7 << 8) /*RW*/
+#define GDM2_MFRC_MASK		(0x7 << 4) /*RW*/
+#define GDM2_OFRC_MASK		(0x7 << 0) /*RW*/
+#define GDM2_ALL_FRC_MASK	(GDM2_UFRC_MASK | GDM2_BFRC_MASK | GDM2_MFRC_MASK | GDM2_OFRC_MASK)
+
+/*--------------------------------------------------------------------------*/
+/* Descriptor Structure */
+/*--------------------------------------------------------------------------*/
+#define HNAT_SKB_CB(__skb) ((struct hnat_skb_cb *)&((__skb)->cb[40]))
+struct hnat_skb_cb {
+	__u16 iif;
+};
+
+struct hnat_unbind_info_blk {
+	u32 time_stamp:8;
+	u32 pcnt:16;		/* packet count */
+	u32 preb:1;
+	u32 pkt_type:3;
+	u32 state:2;
+	u32 udp:1;
+	u32 sta:1;		/* static entry */
+} __attribute__ ((packed));
+
+struct hnat_bind_info_blk {
+	u32 time_stamp:15;
+	u32 ka:1;		/* keep alive */
+	u32 vlan_layer:3;
+	u32 psn:1;		/* egress packet has PPPoE session */
+	u32 vpm:1;		/* 0:ethertype remark, 1:0x8100(CR default) */
+	u32 ps:1;		/* packet sampling */
+	u32 cah:1;		/* cacheable flag */
+	u32 rmt:1;		/* remove tunnel ip header (6rd/dslite only) */
+	u32 ttl:1;
+	u32 pkt_type:3;
+	u32 state:2;
+	u32 udp:1;
+	u32 sta:1;		/* static entry */
+} __attribute__ ((packed));
+
+struct hnat_info_blk2 {
+	u32 qid:4;		/* QID in Qos Port */
+	u32 fqos:1;		/* force to PSE QoS port */
+	u32 dp:3;		/* force to PSE port x 
+				 0:PSE,1:GSW, 2:GMAC,4:PPE,5:QDMA,7=DROP */
+	u32 mcast:1;		/* multicast this packet to CPU */
+	u32 pcpl:1;		/* OSBN */
+	u32 mlen:1;		/* 0:post 1:pre packet length in meter */
+	u32 alen:1;		/* 0:post 1:pre packet length in accounting */
+	u32 port_mg:6;		/* port meter group */
+	u32 port_ag:6;		/* port account group */
+	u32 dscp:8;		/* DSCP value */
+} __attribute__ ((packed));
+
+struct hnat_ipv4_hnapt {
+	union {
+		struct hnat_bind_info_blk bfib1;
+		struct hnat_unbind_info_blk udib1;
+		u32 info_blk1;
+	};
+	u32 sip;
+	u32 dip;
+	u16 dport;
+	u16 sport;
+	union {
+		struct hnat_info_blk2 iblk2;
+		u32 info_blk2;
+	};
+	u32 new_sip;
+	u32 new_dip;
+	u16 new_dport;
+	u16 new_sport;
+	u32 resv1;
+	u32 resv2;
+	u32 resv3:26;
+	u32 act_dp:6;		/* UDF */
+	u16 vlan1;
+	u16 etype;
+	u32 dmac_hi;
+	u16 vlan2;
+	u16 dmac_lo;
+	u32 smac_hi;
+	u16 pppoe_id;
+	u16 smac_lo;
+} __attribute__ ((packed));
+
+struct foe_entry {
+	union {
+		struct hnat_unbind_info_blk udib1;
+		struct hnat_bind_info_blk bfib1;
+		struct hnat_ipv4_hnapt ipv4_hnapt;
+	};
+};
+
+#define HNAT_AC_BYTE_LO(x)		(0x2000 + (x * 16))
+#define HNAT_AC_BYTE_HI(x)		(0x2004 + (x * 16))
+#define HNAT_AC_PACKET(x)		(0x2008 + (x * 16))
+#define HNAT_COUNTER_MAX		64
+#define HNAT_AC_TIMER_INTERVAL		(HZ)
+
+struct hnat_accounting {
+	u64 bytes;
+	u64 packets;
+};
+
+struct hnat_priv {
+	struct device *dev;
+	void __iomem *fe_base;
+	void __iomem *ppe_base;
+	struct foe_entry *foe_table_cpu;
+	dma_addr_t foe_table_dev;
+	u8 enable;
+	u8 enable1;
+	struct dentry *root;
+	struct debugfs_regset32 *regset;
+
+	struct timer_list ac_timer;
+	struct hnat_accounting acct[HNAT_COUNTER_MAX];
+
+	/*devices we plays for*/
+	char wan[IFNAMSIZ];
+
+	struct reset_control	*rstc;
+};
+
+enum FoeEntryState {
+	INVALID = 0,
+	UNBIND = 1,
+	BIND = 2,
+	FIN = 3
+};
+/*--------------------------------------------------------------------------*/
+/* Common Definition*/
+/*--------------------------------------------------------------------------*/
+
+#define FOE_4TB_SIZ		4096
+#define HASH_SEED_KEY		0x12345678
+
+/*PPE_TB_CFG value*/
+#define ENTRY_80B		1
+#define ENTRY_64B		0
+#define TABLE_1K		0
+#define TABLE_2K		1
+#define TABLE_4K		2
+#define TABLE_8K		3
+#define TABLE_16K		4
+#define SMA_DROP		0		/* Drop the packet */
+#define SMA_DROP2		1		/* Drop the packet */
+#define SMA_ONLY_FWD_CPU	2	/* Only Forward to CPU */
+#define SMA_FWD_CPU_BUILD_ENTRY	3	/* Forward to CPU and build new FOE entry */
+#define HASH_MODE_0		0
+#define HASH_MODE_1		1
+#define HASH_MODE_2		2
+#define HASH_MODE_3		3
+
+/*PPE_FLOW_CFG*/
+#define BIT_FUC_FOE		BIT(2)
+#define BIT_FMC_FOE		BIT(1)
+#define BIT_FBC_FOE		BIT(0)
+#define BIT_IPV4_NAT_EN		BIT(12)
+#define BIT_IPV4_NAPT_EN	BIT(13)
+#define BIT_IPV4_NAT_FRAG_EN	BIT(17)
+#define BIT_IPV4_HASH_GREK	BIT(19)
+
+/*GDMA1_FWD_CFG value */
+#define BITS_GDM1_UFRC_P_PPE	(NR_PPE_PORT << 12)
+#define BITS_GDM1_BFRC_P_PPE	(NR_PPE_PORT << 8)
+#define BITS_GDM1_MFRC_P_PPE	(NR_PPE_PORT << 4)
+#define BITS_GDM1_OFRC_P_PPE	(NR_PPE_PORT << 0)
+#define BITS_GDM1_ALL_FRC_P_PPE	(BITS_GDM1_UFRC_P_PPE | BITS_GDM1_BFRC_P_PPE | BITS_GDM1_MFRC_P_PPE | BITS_GDM1_OFRC_P_PPE)
+
+#define BITS_GDM1_UFRC_P_CPU_PDMA	(NR_PDMA_PORT << 12)
+#define BITS_GDM1_BFRC_P_CPU_PDMA	(NR_PDMA_PORT << 8)
+#define BITS_GDM1_MFRC_P_CPU_PDMA	(NR_PDMA_PORT << 4)
+#define BITS_GDM1_OFRC_P_CPU_PDMA	(NR_PDMA_PORT << 0)
+#define BITS_GDM1_ALL_FRC_P_CPU_PDMA	(BITS_GDM1_UFRC_P_CPU_PDMA | BITS_GDM1_BFRC_P_CPU_PDMA | BITS_GDM1_MFRC_P_CPU_PDMA | BITS_GDM1_OFRC_P_CPU_PDMA)
+
+#define BITS_GDM1_UFRC_P_CPU_QDMA	(NR_QDMA_PORT << 12)
+#define BITS_GDM1_BFRC_P_CPU_QDMA	(NR_QDMA_PORT << 8)
+#define BITS_GDM1_MFRC_P_CPU_QDMA	(NR_QDMA_PORT << 4)
+#define BITS_GDM1_OFRC_P_CPU_QDMA	(NR_QDMA_PORT << 0)
+#define BITS_GDM1_ALL_FRC_P_CPU_QDMA	(BITS_GDM1_UFRC_P_CPU_QDMA | BITS_GDM1_BFRC_P_CPU_QDMA | BITS_GDM1_MFRC_P_CPU_QDMA | BITS_GDM1_OFRC_P_CPU_QDMA)
+
+#define BITS_GDM1_UFRC_P_DISCARD	(NR_DISCARD << 12)
+#define BITS_GDM1_BFRC_P_DISCARD	(NR_DISCARD << 8)
+#define BITS_GDM1_MFRC_P_DISCARD	(NR_DISCARD << 4)
+#define BITS_GDM1_OFRC_P_DISCARD	(NR_DISCARD << 0)
+#define BITS_GDM1_ALL_FRC_P_DISCARD	(BITS_GDM1_UFRC_P_DISCARD | BITS_GDM1_BFRC_P_DISCARD | BITS_GDM1_MFRC_P_DISCARD | BITS_GDM1_OFRC_P_DISCARD)
+
+#define BITS_GDM2_UFRC_P_PPE	(NR_PPE_PORT << 12)
+#define BITS_GDM2_BFRC_P_PPE	(NR_PPE_PORT << 8)
+#define BITS_GDM2_MFRC_P_PPE	(NR_PPE_PORT << 4)
+#define BITS_GDM2_OFRC_P_PPE	(NR_PPE_PORT << 0)
+#define BITS_GDM2_ALL_FRC_P_PPE	(BITS_GDM2_UFRC_P_PPE | BITS_GDM2_BFRC_P_PPE | BITS_GDM2_MFRC_P_PPE | BITS_GDM2_OFRC_P_PPE)
+
+#define BITS_GDM2_UFRC_P_CPU_PDMA	(NR_PDMA_PORT << 12)
+#define BITS_GDM2_BFRC_P_CPU_PDMA	(NR_PDMA_PORT << 8)
+#define BITS_GDM2_MFRC_P_CPU_PDMA	(NR_PDMA_PORT << 4)
+#define BITS_GDM2_OFRC_P_CPU_PDMA	(NR_PDMA_PORT << 0)
+#define BITS_GDM2_ALL_FRC_P_CPU_PDMA	(BITS_GDM2_UFRC_P_CPU_PDMA | BITS_GDM2_BFRC_P_CPU_PDMA | BITS_GDM2_MFRC_P_CPU_PDMA | BITS_GDM2_OFRC_P_CPU_PDMA)
+
+#define BITS_GDM2_UFRC_P_CPU_QDMA	(NR_QDMA_PORT << 12)
+#define BITS_GDM2_BFRC_P_CPU_QDMA	(NR_QDMA_PORT << 8)
+#define BITS_GDM2_MFRC_P_CPU_QDMA	(NR_QDMA_PORT << 4)
+#define BITS_GDM2_OFRC_P_CPU_QDMA	(NR_QDMA_PORT << 0)
+#define BITS_GDM2_ALL_FRC_P_CPU_QDMA	(BITS_GDM2_UFRC_P_CPU_QDMA | BITS_GDM2_BFRC_P_CPU_QDMA | BITS_GDM2_MFRC_P_CPU_QDMA | BITS_GDM2_OFRC_P_CPU_QDMA)
+
+#define BITS_GDM2_UFRC_P_DISCARD	(NR_DISCARD << 12)
+#define BITS_GDM2_BFRC_P_DISCARD	(NR_DISCARD << 8)
+#define BITS_GDM2_MFRC_P_DISCARD	(NR_DISCARD << 4)
+#define BITS_GDM2_OFRC_P_DISCARD	(NR_DISCARD << 0)
+#define BITS_GDM2_ALL_FRC_P_DISCARD	(BITS_GDM2_UFRC_P_DISCARD | BITS_GDM2_BFRC_P_DISCARD | BITS_GDM2_MFRC_P_DISCARD | BITS_GDM2_OFRC_P_DISCARD)
+
+#define hnat_is_enabled(host)	(host->enable)
+#define hnat_enabled(host)	(host->enable = 1)
+#define hnat_disabled(host)	(host->enable = 0)
+#define hnat_is_enabled1(host)	(host->enable1)
+#define hnat_enabled1(host)	(host->enable1 = 1)
+#define hnat_disabled1(host)	(host->enable1 = 0)
+
+#define entry_hnat_is_bound(e)	(e->bfib1.state == BIND)
+#define entry_hnat_state(e)	(e->bfib1.state)
+
+#define skb_hnat_is_hashed(skb)	(skb_hnat_entry(skb)!=0x3fff && skb_hnat_entry(skb)< FOE_4TB_SIZ)
+#define FROM_GE_LAN(skb)	(HNAT_SKB_CB(skb)->iif == FOE_MAGIC_GE_LAN)
+#define FROM_GE_WAN(skb)	(HNAT_SKB_CB(skb)->iif == FOE_MAGIC_GE_WAN)
+#define FROM_GE_PPD(skb)	(HNAT_SKB_CB(skb)->iif == FOE_MAGIC_GE_PPD)
+#define FOE_MAGIC_GE_WAN	0x7273
+#define FOE_MAGIC_GE_LAN	0x7272
+#define FOE_INVALID		0xffff
+
+#define TCP_FIN_SYN_RST		0x0C /* Ingress packet is TCP fin/syn/rst (for IPv4 NAPT/DS-Lite or IPv6 5T-route/6RD) */
+#define UN_HIT			0x0D/* FOE Un-hit */
+#define HIT_UNBIND		0x0E/* FOE Hit unbind */
+#define HIT_UNBIND_RATE_REACH	0xf
+#define HNAT_HIT_BIND_OLD_DUP_HDR	0x15
+#define HNAT_HIT_BIND_FORCE_TO_CPU	0x16
+
+#define HIT_BIND_KEEPALIVE_MC_NEW_HDR	0x14
+#define HIT_BIND_KEEPALIVE_DUP_OLD_HDR	0x15
+#define IPV4_HNAPT			0
+#define IPV4_HNAT			1
+#define IP_FORMAT(addr) \
+		((unsigned char *)&addr)[3], \
+		((unsigned char *)&addr)[2], \
+		((unsigned char *)&addr)[1], \
+		((unsigned char *)&addr)[0]
+
+/*PSE Ports*/
+#define NR_PDMA_PORT		0
+#define NR_GMAC1_PORT		1
+#define NR_GMAC2_PORT		2
+#define NR_PPE_PORT		4
+#define NR_QDMA_PORT		5
+#define NR_DISCARD		7
+#define IS_LAN(dev)		(!strncmp(dev->name, "lan", 3))
+#define IS_WAN(dev)		(!strcmp(dev->name, host->wan))
+#define IS_BR(dev)		(!strncmp(dev->name, "br", 2))
+#define IS_IPV4_HNAPT(x)	(((x)->bfib1.pkt_type == IPV4_HNAPT) ? 1: 0)
+#define IS_IPV4_HNAT(x)		(((x)->bfib1.pkt_type == IPV4_HNAT) ? 1 : 0)
+#define IS_IPV4_GRP(x)		(IS_IPV4_HNAPT(x) | IS_IPV4_HNAT(x))
+
+#define es(entry)		(entry_state[entry->bfib1.state])
+#define ei(entry, end)		(FOE_4TB_SIZ - (int)(end - entry))
+#define pt(entry)		(packet_type[entry->ipv4_hnapt.bfib1.pkt_type])
+#define ipv4_smac(mac,e)	({mac[0]=e->ipv4_hnapt.smac_hi[3]; mac[1]=e->ipv4_hnapt.smac_hi[2];\
+				 mac[2]=e->ipv4_hnapt.smac_hi[1]; mac[3]=e->ipv4_hnapt.smac_hi[0];\
+				 mac[4]=e->ipv4_hnapt.smac_lo[1]; mac[5]=e->ipv4_hnapt.smac_lo[0];})
+#define ipv4_dmac(mac,e)	({mac[0]=e->ipv4_hnapt.dmac_hi[3]; mac[1]=e->ipv4_hnapt.dmac_hi[2];\
+				 mac[2]=e->ipv4_hnapt.dmac_hi[1]; mac[3]=e->ipv4_hnapt.dmac_hi[0];\
+				 mac[4]=e->ipv4_hnapt.dmac_lo[1]; mac[5]=e->ipv4_hnapt.dmac_lo[0];})
+
+extern struct hnat_priv *host;
+
+extern void hnat_deinit_debugfs(struct hnat_priv *h);
+extern int __init hnat_init_debugfs(struct hnat_priv *h);
+extern int hnat_register_nf_hooks(void);
+extern void hnat_unregister_nf_hooks(void);
+
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/mtk_hnat/hnat_debugfs.c
@@ -0,0 +1,489 @@
+/*   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; version 2 of the License
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   Copyright (C) 2014-2016 Sean Wang <sean.wang@mediatek.com>
+ *   Copyright (C) 2016-2017 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include "hnat.h"
+
+static const char *entry_state[] = {
+	"INVALID",
+	"UNBIND",
+	"BIND",
+	"FIN"
+};
+
+static const char *packet_type[] = {
+	"IPV4_HNAPT",
+	"IPV4_HNAT",
+	"IPV6_1T_ROUTE",
+	"IPV4_DSLITE",
+	"IPV6_3T_ROUTE",
+	"IPV6_5T_ROUTE",
+	"IPV6_6RD",
+};
+
+static int hnat_debug_show(struct seq_file *m, void *private)
+{
+	struct hnat_priv *h = host;
+	struct foe_entry *entry, *end;
+
+	entry = h->foe_table_cpu;
+	end = h->foe_table_cpu + FOE_4TB_SIZ;
+	while (entry < end) {
+		if (!entry->bfib1.state) {
+			entry++;
+			continue;
+		}
+
+		if (IS_IPV4_HNAPT(entry)) {
+			__be32 saddr = htonl(entry->ipv4_hnapt.sip);
+			__be32 daddr = htonl(entry->ipv4_hnapt.dip);
+			__be32 nsaddr = htonl(entry->ipv4_hnapt.new_sip);
+			__be32 ndaddr = htonl(entry->ipv4_hnapt.new_dip);
+			unsigned char h_dest[ETH_ALEN];
+			unsigned char h_source[ETH_ALEN];
+
+			*((u32*) h_source) = swab32(entry->ipv4_hnapt.smac_hi);
+			*((u16*) &h_source[4]) = swab16(entry->ipv4_hnapt.smac_lo);
+			*((u32*) h_dest) = swab32(entry->ipv4_hnapt.dmac_hi);
+			*((u16*) &h_dest[4]) = swab16(entry->ipv4_hnapt.dmac_lo);
+			seq_printf(m,
+				   "(%p)0x%05x|state=%s|type=%s|%pI4:%d->%pI4:%d=>%pI4:%d->%pI4:%d|%pM=>%pM|etype=0x%04x|info1=0x%x|info2=0x%x|vlan1=%d|vlan2=%d\n",
+				   (void *)h->foe_table_dev + ((void *)(entry) - (void *)h->foe_table_cpu),
+				   ei(entry, end), es(entry), pt(entry),
+				   &saddr, entry->ipv4_hnapt.sport,
+				   &daddr, entry->ipv4_hnapt.dport,
+				   &nsaddr, entry->ipv4_hnapt.new_sport,
+				   &ndaddr, entry->ipv4_hnapt.new_dport, h_source,
+				   h_dest, ntohs(entry->ipv4_hnapt.etype),
+				   entry->ipv4_hnapt.info_blk1,
+				   entry->ipv4_hnapt.info_blk2,
+				   entry->ipv4_hnapt.vlan1,
+				   entry->ipv4_hnapt.vlan2);
+		} else
+			seq_printf(m, "0x%05x state=%s\n",
+				   ei(entry, end), es(entry));
+		entry++;
+	}
+
+	return 0;
+}
+
+static int hnat_debug_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, hnat_debug_show, file->private_data);
+}
+
+static const struct file_operations hnat_debug_fops = {
+	.open = hnat_debug_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+#define QDMA_TX_SCH_TX		0x1a14
+
+static ssize_t hnat_sched_show(struct file *file, char __user *user_buf,
+			       size_t count, loff_t *ppos)
+{
+	int id = (int) file->private_data;
+	struct hnat_priv *h = host;
+	u32 reg = readl(h->fe_base + QDMA_TX_SCH_TX);
+	int enable;
+	int max_rate;
+	char *buf;
+	unsigned int len = 0, buf_len = 1500;
+	ssize_t ret_cnt;
+
+	buf = kzalloc(buf_len, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+
+	if (id)
+		reg >>= 16;
+	reg &= 0xffff;
+	enable = !! (reg & BIT(11));
+	max_rate = ((reg >> 4) & 0x7f);
+	reg &= 0xf;
+	while (reg--)
+		max_rate *= 10;
+
+	len += scnprintf(buf + len, buf_len - len,
+			 "EN\tMAX\n%d\t%d\n", enable, max_rate);
+
+	if (len > buf_len)
+		len = buf_len;
+
+	ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+
+	kfree(buf);
+	return ret_cnt;
+}
+
+static ssize_t hnat_sched_write(struct file *file,
+				const char __user *buf, size_t length, loff_t *offset)
+{
+	int id = (int) file->private_data;
+	struct hnat_priv *h = host;
+	char line[64];
+	int enable, rate, exp = 0, shift = 0;
+	size_t size;
+	u32 reg = readl(h->fe_base + QDMA_TX_SCH_TX);
+	u32 val = 0;
+
+	if (length > sizeof(line))
+		return -EINVAL;
+
+        if (copy_from_user(line, buf, length))
+		return -EFAULT;
+
+	sscanf(line, "%d %d", &enable, &rate);
+
+	while (rate > 127) {
+		rate /= 10;
+		exp++;
+	}
+
+	if (enable)
+		val |= BIT(11);
+	val |= (rate & 0x7f) << 4;
+	val |= exp & 0xf;
+	if (id)
+		shift = 16;
+	reg &= ~(0xffff << shift);
+	reg |= val << shift;
+	writel(reg, h->fe_base + QDMA_TX_SCH_TX);
+
+	size = strlen(line);
+	*offset += size;
+
+	return length;
+}
+
+static const struct file_operations hnat_sched_fops = {
+	.open = simple_open,
+	.read = hnat_sched_show,
+	.write = hnat_sched_write,
+	.llseek = default_llseek,
+};
+
+#define QTX_CFG(x)	(0x1800 + (x * 0x10))
+#define QTX_SCH(x)	(0x1804 + (x * 0x10))
+
+static ssize_t hnat_queue_show(struct file *file, char __user *user_buf,
+			       size_t count, loff_t *ppos)
+{
+	struct hnat_priv *h = host;
+	int id = (int) file->private_data;
+	u32 reg = readl(h->fe_base + QTX_SCH(id));
+	u32 cfg = readl(h->fe_base + QTX_CFG(id));
+	int scheduler = !!(reg & BIT(31));
+	int min_rate_en = !!(reg & BIT(27));
+	int min_rate = (reg >> 20) & 0x7f;
+	int min_rate_exp = (reg >> 16) & 0xf;
+	int max_rate_en = !!(reg & BIT(11));
+	int max_weight = (reg >> 12) & 0xf;
+	int max_rate = (reg >> 4) & 0x7f;
+	int max_rate_exp = reg & 0xf;
+	char *buf;
+	unsigned int len = 0, buf_len = 1500;
+	ssize_t ret_cnt;
+
+	buf = kzalloc(buf_len, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	while (min_rate_exp--)
+		min_rate *= 10;
+
+	while (max_rate_exp--)
+		max_rate *= 10;
+
+	len += scnprintf(buf + len, buf_len - len,
+			"scheduler: %d\nhw resv: %d\nsw resv: %d\n",
+			scheduler, (cfg >> 8) & 0xff, cfg & 0xff);
+	len += scnprintf(buf + len, buf_len - len,
+			"\tEN\tRATE\t\tWEIGHT\n");
+	len += scnprintf(buf + len, buf_len - len,
+			"max\t%d\t%8d\t%d\n", max_rate_en, max_rate, max_weight);
+	len += scnprintf(buf + len, buf_len - len,
+			"min\t%d\t%8d\t-\n", min_rate_en, min_rate);
+
+	if (len > buf_len)
+		len = buf_len;
+
+	ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+
+	kfree(buf);
+	return ret_cnt;
+}
+
+static ssize_t hnat_queue_write(struct file *file,
+				const char __user *buf, size_t length, loff_t *offset)
+{
+	int id = (int) file->private_data;
+	struct hnat_priv *h = host;
+	char line[64];
+	int max_enable, max_rate, max_exp = 0;
+	int min_enable, min_rate, min_exp = 0;
+	int weight;
+	int resv;
+	int scheduler;
+	size_t size;
+	u32 reg = readl(h->fe_base + QTX_SCH(id));
+
+	if (length > sizeof(line))
+		return -EINVAL;
+
+        if (copy_from_user(line, buf, length))
+		return -EFAULT;
+
+	sscanf(line, "%d %d %d %d %d %d %d", &scheduler, &min_enable, &min_rate, &max_enable, &max_rate, &weight, &resv);
+
+	while (max_rate > 127) {
+		max_rate /= 10;
+		max_exp++;
+	}
+
+	while (min_rate > 127) {
+		min_rate /= 10;
+		min_exp++;
+	}
+
+	reg &= 0x70000000;
+	if (scheduler)
+		reg |= BIT(31);
+	if (min_enable)
+		reg |= BIT(27);
+	reg |= (min_rate & 0x7f) << 20;
+	reg |= (min_exp & 0xf) << 16;
+	if (max_enable)
+		reg |= BIT(11);
+	reg |= (weight & 0xf) << 12;
+	reg |= (max_rate & 0x7f) << 4;
+	reg |= max_exp & 0xf;
+	writel(reg, h->fe_base + QTX_SCH(id));
+
+	resv &= 0xff;
+	reg = readl(h->fe_base + QTX_CFG(id));
+	reg &= 0xffff0000;
+	reg |= (resv << 8) | resv;
+	writel(reg, h->fe_base + QTX_CFG(id));
+
+	size = strlen(line);
+	*offset += size;
+
+	return length;
+}
+
+static const struct file_operations hnat_queue_fops = {
+	.open = simple_open,
+	.read = hnat_queue_show,
+	.write = hnat_queue_write,
+	.llseek = default_llseek,
+};
+
+static void hnat_ac_timer_handle(unsigned long priv)
+{
+	struct hnat_priv *h = (struct hnat_priv*) priv;
+	int i;
+
+	for (i = 0; i < HNAT_COUNTER_MAX; i++) {
+		u32 b_hi, b_lo;
+		u64 b;
+
+		b_lo = readl(h->fe_base + HNAT_AC_BYTE_LO(i));
+		b_hi = readl(h->fe_base + HNAT_AC_BYTE_HI(i));
+		b = b_hi;
+		b <<= 32;
+		b += b_lo;
+		h->acct[i].bytes += b;
+		h->acct[i].packets += readl(h->fe_base + HNAT_AC_PACKET(i));
+	}
+
+	mod_timer(&h->ac_timer, jiffies + HNAT_AC_TIMER_INTERVAL);
+}
+
+static ssize_t hnat_counter_show(struct file *file, char __user *user_buf,
+				 size_t count, loff_t *ppos)
+{
+	struct hnat_priv *h = host;
+	int id = (int) file->private_data;
+	char *buf;
+	unsigned int len = 0, buf_len = 1500;
+	ssize_t ret_cnt;
+	int id2 = id + (HNAT_COUNTER_MAX / 2);
+
+	buf = kzalloc(buf_len, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	len += scnprintf(buf + len, buf_len - len,
+			 "tx pkts : %llu\ntx bytes: %llu\nrx pktks : %llu\nrx bytes : %llu\n",
+			 h->acct[id].packets, h->acct[id].bytes,
+			 h->acct[id2].packets, h->acct[id2].bytes);
+
+	if (len > buf_len)
+		len = buf_len;
+
+	ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+
+	kfree(buf);
+	return ret_cnt;
+}
+
+static const struct file_operations hnat_counter_fops = {
+	.open = simple_open,
+	.read = hnat_counter_show,
+	.llseek = default_llseek,
+};
+
+#define dump_register(nm)				\
+{							\
+	.name	= __stringify(nm),			\
+	.offset	= PPE_ ##nm ,	\
+}
+
+static const struct debugfs_reg32 hnat_regs[] = {
+	dump_register(GLO_CFG),
+	dump_register(FLOW_CFG),
+	dump_register(IP_PROT_CHK),
+	dump_register(IP_PROT_0),
+	dump_register(IP_PROT_1),
+	dump_register(IP_PROT_2),
+	dump_register(IP_PROT_3),
+	dump_register(TB_CFG),
+	dump_register(TB_BASE),
+	dump_register(TB_USED),
+	dump_register(BNDR),
+	dump_register(BIND_LMT_0),
+	dump_register(BIND_LMT_1),
+	dump_register(KA),
+	dump_register(UNB_AGE),
+	dump_register(BND_AGE_0),
+	dump_register(BND_AGE_1),
+	dump_register(HASH_SEED),
+	dump_register(DFT_CPORT),
+	dump_register(MCAST_PPSE),
+	dump_register(MCAST_L_0),
+	dump_register(MCAST_H_0),
+	dump_register(MCAST_L_1),
+	dump_register(MCAST_H_1),
+	dump_register(MCAST_L_2),
+	dump_register(MCAST_H_2),
+	dump_register(MCAST_L_3),
+	dump_register(MCAST_H_3),
+	dump_register(MCAST_L_4),
+	dump_register(MCAST_H_4),
+	dump_register(MCAST_L_5),
+	dump_register(MCAST_H_5),
+	dump_register(MCAST_L_6),
+	dump_register(MCAST_H_6),
+	dump_register(MCAST_L_7),
+	dump_register(MCAST_H_7),
+	dump_register(MCAST_L_8),
+	dump_register(MCAST_H_8),
+	dump_register(MCAST_L_9),
+	dump_register(MCAST_H_9),
+	dump_register(MCAST_L_A),
+	dump_register(MCAST_H_A),
+	dump_register(MCAST_L_B),
+	dump_register(MCAST_H_B),
+	dump_register(MCAST_L_C),
+	dump_register(MCAST_H_C),
+	dump_register(MCAST_L_D),
+	dump_register(MCAST_H_D),
+	dump_register(MCAST_L_E),
+	dump_register(MCAST_H_E),
+	dump_register(MCAST_L_F),
+	dump_register(MCAST_H_F),
+	dump_register(MTU_DRP),
+	dump_register(MTU_VLYR_0),
+	dump_register(MTU_VLYR_1),
+	dump_register(MTU_VLYR_2),
+	dump_register(VPM_TPID),
+	dump_register(VPM_TPID),
+	dump_register(CAH_CTRL),
+	dump_register(CAH_TAG_SRH),
+	dump_register(CAH_LINE_RW),
+	dump_register(CAH_WDATA),
+	dump_register(CAH_RDATA),
+};
+
+int __init hnat_init_debugfs(struct hnat_priv *h)
+{
+	int ret = 0;
+	struct dentry *root;
+	struct dentry *file;
+	int i;
+	char name[16];
+
+	root = debugfs_create_dir("hnat", NULL);
+	if (!root) {
+		dev_err(h->dev, "%s:err at %d\n", __func__, __LINE__);
+		ret = -ENOMEM;
+		goto err0;
+	}
+	h->root = root;
+	h->regset = kzalloc(sizeof(*h->regset), GFP_KERNEL);
+	if (!h->regset) {
+		dev_err(h->dev, "%s:err at %d\n", __func__, __LINE__);
+		ret = -ENOMEM;
+		goto err1;
+	}
+	h->regset->regs = hnat_regs;
+	h->regset->nregs = ARRAY_SIZE(hnat_regs);
+	h->regset->base = h->ppe_base;
+
+	file = debugfs_create_regset32("regdump", S_IRUGO, root, h->regset);
+	if (!file) {
+		dev_err(h->dev, "%s:err at %d\n", __func__, __LINE__);
+		ret = -ENOMEM;
+		goto err1;
+	}
+	debugfs_create_file("all_entry", S_IRUGO, root, h, &hnat_debug_fops);
+	for (i = 0; i < HNAT_COUNTER_MAX / 2; i++) {
+		snprintf(name, sizeof(name), "counter%d", i);
+		debugfs_create_file(name, S_IRUGO, root, (void *)i, &hnat_counter_fops);
+	}
+
+	for (i = 0; i < 2; i++) {
+		snprintf(name, sizeof(name), "scheduler%d", i);
+		debugfs_create_file(name, S_IRUGO, root, (void *)i, &hnat_sched_fops);
+	}
+
+	for (i = 0; i < 16; i++) {
+		snprintf(name, sizeof(name), "queue%d", i);
+		debugfs_create_file(name, S_IRUGO, root, (void *)i, &hnat_queue_fops);
+	}
+
+	setup_timer(&h->ac_timer, hnat_ac_timer_handle, (unsigned long) h);
+	mod_timer(&h->ac_timer, jiffies + HNAT_AC_TIMER_INTERVAL);
+
+	return 0;
+
+ err1:
+	debugfs_remove_recursive(root);
+ err0:
+	return ret;
+}
+
+void hnat_deinit_debugfs(struct hnat_priv *h)
+{
+	del_timer(&h->ac_timer);
+	debugfs_remove_recursive(h->root);
+	h->root = NULL;
+}
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/mtk_hnat/hnat_nf_hook.c
@@ -0,0 +1,289 @@
+/*   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; version 2 of the License
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   Copyright (C) 2014-2016 Sean Wang <sean.wang@mediatek.com>
+ *   Copyright (C) 2016-2017 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/netfilter_bridge.h>
+
+#include <net/arp.h>
+#include <net/neighbour.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+
+#include "nf_hnat_mtk.h"
+#include "hnat.h"
+
+#include "../mtk_eth_soc.h"
+
+static unsigned int skb_to_hnat_info(struct sk_buff *skb,
+				     const struct net_device *dev,
+				     struct foe_entry *foe)
+{
+	struct foe_entry entry = { 0 };
+	int lan = IS_LAN(dev);
+	struct ethhdr *eth;
+	struct iphdr *iph;
+	struct tcphdr *tcph;
+	struct udphdr *udph;
+	int tcp = 0;
+	int ipv4 = 0;
+	u32 gmac;
+
+	eth = eth_hdr(skb);
+	switch (ntohs(eth->h_proto)) {
+	case ETH_P_IP:
+		ipv4 = 1;
+		break;
+
+	default:
+		return -1;
+	}
+
+	iph = ip_hdr(skb);
+	switch (iph->protocol) {
+	case IPPROTO_TCP:
+		tcph = tcp_hdr(skb);
+		tcp = 1;
+		break;
+
+	case IPPROTO_UDP:
+		udph = udp_hdr(skb);
+		break;
+
+	default:
+		return -1;
+	}
+
+	entry.ipv4_hnapt.etype = htons(ETH_P_IP);
+
+	if (lan) {
+		entry.ipv4_hnapt.etype = htons(ETH_P_8021Q);
+		entry.bfib1.vlan_layer = 1;
+		entry.ipv4_hnapt.vlan1 = BIT(dev->name[3] - '0');
+	}
+
+	if (dev->priv_flags & IFF_802_1Q_VLAN) {
+		struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+
+		entry.ipv4_hnapt.etype = htons(ETH_P_8021Q);
+		entry.bfib1.vlan_layer = 1;
+		if (lan)
+			entry.ipv4_hnapt.vlan2 = vlan->vlan_id;
+		else
+			entry.ipv4_hnapt.vlan1 = vlan->vlan_id;
+	}
+
+	entry.ipv4_hnapt.dmac_hi = swab32(*((u32*) eth->h_dest));
+	entry.ipv4_hnapt.dmac_lo = swab16(*((u16*) &eth->h_dest[4]));
+	entry.ipv4_hnapt.smac_hi = swab32(*((u32*) eth->h_source));
+	entry.ipv4_hnapt.smac_lo = swab16(*((u16*) &eth->h_source[4]));
+	entry.ipv4_hnapt.pppoe_id = 0;
+	entry.bfib1.psn = 0;
+	entry.ipv4_hnapt.bfib1.vpm = 1;
+
+	if (ipv4)
+		entry.ipv4_hnapt.bfib1.pkt_type = IPV4_HNAPT;
+
+	entry.ipv4_hnapt.new_sip = ntohl(iph->saddr);
+	entry.ipv4_hnapt.new_dip = ntohl(iph->daddr);
+	entry.ipv4_hnapt.iblk2.dscp = iph->tos;
+#if defined(CONFIG_NET_MEDIATEK_HW_QOS)
+	entry.ipv4_hnapt.iblk2.qid = skb->mark & 0x7;
+	if (lan)
+		entry.ipv4_hnapt.iblk2.qid += 8;
+	entry.ipv4_hnapt.iblk2.fqos = 1;
+#endif
+	if (tcp) {
+		entry.ipv4_hnapt.new_sport = ntohs(tcph->source);
+		entry.ipv4_hnapt.new_dport = ntohs(tcph->dest);
+		entry.ipv4_hnapt.bfib1.udp = 0;
+	} else {
+		entry.ipv4_hnapt.new_sport = ntohs(udph->source);
+		entry.ipv4_hnapt.new_dport = ntohs(udph->dest);
+		entry.ipv4_hnapt.bfib1.udp = 1;
+	}
+
+	if (IS_LAN(dev))
+		gmac = NR_GMAC1_PORT;
+	else if (IS_WAN(dev))
+		gmac = NR_GMAC2_PORT;
+
+	if (is_multicast_ether_addr(&eth->h_dest[0]))
+		entry.ipv4_hnapt.iblk2.mcast = 1;
+	else
+		entry.ipv4_hnapt.iblk2.mcast = 0;
+
+	entry.ipv4_hnapt.iblk2.dp = gmac;
+	entry.ipv4_hnapt.iblk2.port_mg = 0x3f;
+	entry.ipv4_hnapt.iblk2.port_ag = (skb->mark >> 3) & 0x1f;
+	if (IS_LAN(dev))
+		entry.ipv4_hnapt.iblk2.port_ag += 32;
+	entry.bfib1.time_stamp = readl((host->fe_base + 0x0010)) & (0xFFFF);
+	entry.ipv4_hnapt.bfib1.ttl = 1;
+	entry.ipv4_hnapt.bfib1.cah = 1;
+	entry.ipv4_hnapt.bfib1.ka = 1;
+	entry.bfib1.state = BIND;
+
+	entry.ipv4_hnapt.sip = foe->ipv4_hnapt.sip;
+	entry.ipv4_hnapt.dip = foe->ipv4_hnapt.dip;
+	entry.ipv4_hnapt.sport = foe->ipv4_hnapt.sport;
+	entry.ipv4_hnapt.dport = foe->ipv4_hnapt.dport;
+
+	memcpy(foe, &entry, sizeof(entry));
+
+	return 0;
+}
+
+static unsigned int mtk_hnat_nf_post_routing(struct sk_buff *skb,
+					     const struct net_device *out,
+					     unsigned int (*fn)(struct sk_buff *, const struct net_device *),
+					     const char *func)
+{
+	struct foe_entry *entry;
+	struct nf_conn *ct;
+	enum ip_conntrack_info ctinfo;
+	const struct nf_conn_help *help;
+
+	if ((skb->mark & 0x7) < 4)
+		return 0;
+
+	ct = nf_ct_get(skb, &ctinfo);
+	if (!ct)
+		return 0;
+
+	/* rcu_read_lock()ed by nf_hook_slow */
+	help = nfct_help(ct);
+	if (help && rcu_dereference(help->helper))
+		return 0;
+
+	if ((FROM_GE_WAN(skb) || FROM_GE_LAN(skb)) &&
+	    skb_hnat_is_hashed(skb) &&
+	    (skb_hnat_reason(skb) == HIT_BIND_KEEPALIVE_DUP_OLD_HDR))
+		return -1;
+
+	if ((IS_LAN(out) && FROM_GE_WAN(skb)) ||
+	    (IS_WAN(out) && FROM_GE_LAN(skb))) {
+		if (!skb_hnat_is_hashed(skb))
+			return 0;
+
+		entry = &host->foe_table_cpu[skb_hnat_entry(skb)];
+		if (entry_hnat_is_bound(entry))
+			return 0;
+
+		if (skb_hnat_reason(skb) == HIT_UNBIND_RATE_REACH &&
+		    skb_hnat_alg(skb) == 0) {
+			if (fn && fn(skb, out))
+				return 0;
+			skb_to_hnat_info(skb, out, entry);
+		}
+	}
+
+	return 0;
+}
+
+static unsigned int mtk_hnat_nf_pre_routing(void *priv,
+					    struct sk_buff *skb,
+					    const struct nf_hook_state *state)
+{
+	if (IS_WAN(state->in))
+		HNAT_SKB_CB(skb)->iif = FOE_MAGIC_GE_WAN;
+	else if (IS_LAN(state->in))
+		HNAT_SKB_CB(skb)->iif = FOE_MAGIC_GE_LAN;
+	else if (!IS_BR(state->in))
+		HNAT_SKB_CB(skb)->iif = FOE_INVALID;
+
+	return NF_ACCEPT;
+}
+
+static unsigned int hnat_get_nexthop(struct sk_buff *skb, const struct net_device *out) {
+
+	u32 nexthop;
+	struct neighbour *neigh;
+	struct dst_entry *dst = skb_dst(skb);
+	struct rtable *rt = (struct rtable *)dst;
+	struct net_device *dev = (__force struct net_device *)out;
+
+	rcu_read_lock_bh();
+	nexthop = (__force u32) rt_nexthop(rt, ip_hdr(skb)->daddr);
+	neigh = __ipv4_neigh_lookup_noref(dev, nexthop);
+	if (unlikely(!neigh)) {
+		dev_err(host->dev, "%s:++ no neigh\n", __func__);
+		return -1;
+	}
+
+	/* why do we get all zero ethernet address ? */
+	if (!is_valid_ether_addr(neigh->ha)){
+		rcu_read_unlock_bh();
+		return -1;
+	}
+
+	memcpy(eth_hdr(skb)->h_dest, neigh->ha, ETH_ALEN);
+	memcpy(eth_hdr(skb)->h_source, out->dev_addr, ETH_ALEN);
+
+	rcu_read_unlock_bh();
+
+	return 0;
+}
+
+static unsigned int mtk_hnat_ipv4_nf_post_routing(void *priv,
+						 struct sk_buff *skb,
+						 const struct nf_hook_state *state)
+{
+	if (!mtk_hnat_nf_post_routing(skb, state->out, hnat_get_nexthop, __func__))
+		return NF_ACCEPT;
+
+	return NF_DROP;
+}
+
+static unsigned int mtk_hnat_br_nf_post_routing(void *priv,
+						 struct sk_buff *skb,
+						 const struct nf_hook_state *state)
+{
+	if (!mtk_hnat_nf_post_routing(skb, state->out , 0, __func__))
+		return NF_ACCEPT;
+
+	return NF_DROP;
+}
+
+static struct nf_hook_ops mtk_hnat_nf_ops[] __read_mostly = {
+	{
+		.hook = mtk_hnat_nf_pre_routing,
+		.pf = NFPROTO_IPV4,
+		.hooknum = NF_INET_PRE_ROUTING,
+		.priority = NF_IP_PRI_FIRST,
+	}, {
+		.hook = mtk_hnat_ipv4_nf_post_routing,
+		.pf = NFPROTO_IPV4,
+		.hooknum = NF_INET_POST_ROUTING,
+		.priority = NF_IP_PRI_LAST,
+	}, {
+		.hook = mtk_hnat_nf_pre_routing,
+		.pf = NFPROTO_BRIDGE,
+		.hooknum = NF_BR_PRE_ROUTING,
+		.priority = NF_BR_PRI_FIRST,
+	}, {
+		.hook = mtk_hnat_br_nf_post_routing,
+		.pf = NFPROTO_BRIDGE,
+		.hooknum = NF_BR_POST_ROUTING,
+		.priority = NF_BR_PRI_LAST - 1,
+	},
+};
+
+int hnat_register_nf_hooks(void)
+{
+	return nf_register_hooks(mtk_hnat_nf_ops,
+				 ARRAY_SIZE(mtk_hnat_nf_ops));
+}
+
+void hnat_unregister_nf_hooks(void)
+{
+	nf_unregister_hooks(mtk_hnat_nf_ops,
+			    ARRAY_SIZE(mtk_hnat_nf_ops));
+}
--- /dev/null
+++ b/drivers/net/ethernet/mediatek/mtk_hnat/nf_hnat_mtk.h
@@ -0,0 +1,44 @@
+/*   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; version 2 of the License
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   Copyright (C) 2014-2016 Sean Wang <sean.wang@mediatek.com>
+ *   Copyright (C) 2016-2017 John Crispin <blogic@openwrt.org>
+ */
+
+#ifndef NF_HNAT_MTK_H
+#define NF_HNAT_MTK_H
+
+#include <asm/dma-mapping.h>
+#include <linux/netdevice.h>
+
+#define HNAT_SKB_CB2(__skb)		((struct hnat_skb_cb2 *)&((__skb)->cb[44]))
+struct hnat_skb_cb2 {
+	__u32  magic;
+};
+
+struct hnat_desc {
+	u32 entry:14;
+	u32 crsn:5;
+	u32 sport:4;
+	u32 alg:9;
+} __attribute__ ((packed));
+
+#define skb_hnat_magic(skb)  (((struct hnat_desc *)(skb->head))->magic)
+#define skb_hnat_reason(skb) (((struct hnat_desc *)(skb->head))->crsn)
+#define skb_hnat_entry(skb)  (((struct hnat_desc *)(skb->head))->entry)
+#define skb_hnat_sport(skb)  (((struct hnat_desc *)(skb->head))->sport)
+#define skb_hnat_alg(skb)  (((struct hnat_desc *)(skb->head))->alg)
+
+u32 hnat_tx(struct sk_buff *skb);
+u32 hnat_set_skb_info(struct sk_buff *skb, u32 *rxd);
+u32 hnat_reg(struct net_device *, void __iomem *);
+u32 hnat_unreg(void);
+
+#endif
+