From: Sujuan Chen <sujuan.chen@mediatek.com>
Date: Mon, 18 Sep 2023 12:29:15 +0200
Subject: [PATCH] net: ethernet: mtk_wed: introduce partial AMSDU offload
 support for MT7988

Introduce partial AMSDU offload support for MT7988 SoC in order to merge
in hw packets belonging to the same AMSDU before passing them to the
WLAN nic.

Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Sujuan Chen <sujuan.chen@mediatek.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---

--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
@@ -425,7 +425,8 @@ int mtk_foe_entry_set_pppoe(struct mtk_e
 }
 
 int mtk_foe_entry_set_wdma(struct mtk_eth *eth, struct mtk_foe_entry *entry,
-			   int wdma_idx, int txq, int bss, int wcid)
+			   int wdma_idx, int txq, int bss, int wcid,
+			   bool amsdu_en)
 {
 	struct mtk_foe_mac_info *l2 = mtk_foe_entry_l2(eth, entry);
 	u32 *ib2 = mtk_foe_entry_ib2(eth, entry);
@@ -437,6 +438,7 @@ int mtk_foe_entry_set_wdma(struct mtk_et
 			 MTK_FOE_IB2_WDMA_WINFO_V2;
 		l2->w3info = FIELD_PREP(MTK_FOE_WINFO_WCID_V3, wcid) |
 			     FIELD_PREP(MTK_FOE_WINFO_BSS_V3, bss);
+		l2->amsdu = FIELD_PREP(MTK_FOE_WINFO_AMSDU_EN, amsdu_en);
 		break;
 	case 2:
 		*ib2 &= ~MTK_FOE_IB2_PORT_MG_V2;
--- a/drivers/net/ethernet/mediatek/mtk_ppe.h
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.h
@@ -88,13 +88,13 @@ enum {
 #define MTK_FOE_WINFO_BSS_V3		GENMASK(23, 16)
 #define MTK_FOE_WINFO_WCID_V3		GENMASK(15, 0)
 
-#define MTK_FOE_WINFO_PAO_USR_INFO	GENMASK(15, 0)
-#define MTK_FOE_WINFO_PAO_TID		GENMASK(19, 16)
-#define MTK_FOE_WINFO_PAO_IS_FIXEDRATE	BIT(20)
-#define MTK_FOE_WINFO_PAO_IS_PRIOR	BIT(21)
-#define MTK_FOE_WINFO_PAO_IS_SP		BIT(22)
-#define MTK_FOE_WINFO_PAO_HF		BIT(23)
-#define MTK_FOE_WINFO_PAO_AMSDU_EN	BIT(24)
+#define MTK_FOE_WINFO_AMSDU_USR_INFO	GENMASK(15, 0)
+#define MTK_FOE_WINFO_AMSDU_TID		GENMASK(19, 16)
+#define MTK_FOE_WINFO_AMSDU_IS_FIXEDRATE	BIT(20)
+#define MTK_FOE_WINFO_AMSDU_IS_PRIOR	BIT(21)
+#define MTK_FOE_WINFO_AMSDU_IS_SP	BIT(22)
+#define MTK_FOE_WINFO_AMSDU_HF		BIT(23)
+#define MTK_FOE_WINFO_AMSDU_EN		BIT(24)
 
 enum {
 	MTK_FOE_STATE_INVALID,
@@ -123,7 +123,7 @@ struct mtk_foe_mac_info {
 
 	/* netsys_v3 */
 	u32 w3info;
-	u32 wpao;
+	u32 amsdu;
 };
 
 /* software-only entry type */
@@ -392,7 +392,8 @@ int mtk_foe_entry_set_vlan(struct mtk_et
 int mtk_foe_entry_set_pppoe(struct mtk_eth *eth, struct mtk_foe_entry *entry,
 			    int sid);
 int mtk_foe_entry_set_wdma(struct mtk_eth *eth, struct mtk_foe_entry *entry,
-			   int wdma_idx, int txq, int bss, int wcid);
+			   int wdma_idx, int txq, int bss, int wcid,
+			   bool amsdu_en);
 int mtk_foe_entry_set_queue(struct mtk_eth *eth, struct mtk_foe_entry *entry,
 			    unsigned int queue);
 int mtk_foe_entry_commit(struct mtk_ppe *ppe, struct mtk_flow_entry *entry);
--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
@@ -115,6 +115,7 @@ mtk_flow_get_wdma_info(struct net_device
 	info->queue = path->mtk_wdma.queue;
 	info->bss = path->mtk_wdma.bss;
 	info->wcid = path->mtk_wdma.wcid;
+	info->amsdu = path->mtk_wdma.amsdu;
 
 	return 0;
 }
@@ -196,7 +197,7 @@ mtk_flow_set_output_device(struct mtk_et
 
 	if (mtk_flow_get_wdma_info(dev, dest_mac, &info) == 0) {
 		mtk_foe_entry_set_wdma(eth, foe, info.wdma_idx, info.queue,
-				       info.bss, info.wcid);
+				       info.bss, info.wcid, info.amsdu);
 		if (mtk_is_netsys_v2_or_greater(eth)) {
 			switch (info.wdma_idx) {
 			case 0:
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -30,6 +30,8 @@
 #define MTK_WED_RX_PAGE_BUF_PER_PAGE	(PAGE_SIZE / 128)
 #define MTK_WED_RX_RING_SIZE		1536
 #define MTK_WED_RX_PG_BM_CNT		8192
+#define MTK_WED_AMSDU_BUF_SIZE		(PAGE_SIZE << 4)
+#define MTK_WED_AMSDU_NPAGES		32
 
 #define MTK_WED_TX_RING_SIZE		2048
 #define MTK_WED_WDMA_RING_SIZE		1024
@@ -173,6 +175,23 @@ mtk_wdma_rx_reset(struct mtk_wed_device
 	return ret;
 }
 
+static u32
+mtk_wed_check_busy(struct mtk_wed_device *dev, u32 reg, u32 mask)
+{
+	return !!(wed_r32(dev, reg) & mask);
+}
+
+static int
+mtk_wed_poll_busy(struct mtk_wed_device *dev, u32 reg, u32 mask)
+{
+	int sleep = 15000;
+	int timeout = 100 * sleep;
+	u32 val;
+
+	return read_poll_timeout(mtk_wed_check_busy, val, !val, sleep,
+				 timeout, false, dev, reg, mask);
+}
+
 static void
 mtk_wdma_tx_reset(struct mtk_wed_device *dev)
 {
@@ -336,6 +355,118 @@ out:
 }
 
 static int
+mtk_wed_amsdu_buffer_alloc(struct mtk_wed_device *dev)
+{
+	struct mtk_wed_hw *hw = dev->hw;
+	struct mtk_wed_amsdu *wed_amsdu;
+	int i;
+
+	if (!mtk_wed_is_v3_or_greater(hw))
+		return 0;
+
+	wed_amsdu = devm_kcalloc(hw->dev, MTK_WED_AMSDU_NPAGES,
+				 sizeof(*wed_amsdu), GFP_KERNEL);
+	if (!wed_amsdu)
+		return -ENOMEM;
+
+	for (i = 0; i < MTK_WED_AMSDU_NPAGES; i++) {
+		void *ptr;
+
+		/* each segment is 64K */
+		ptr = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN |
+					       __GFP_ZERO | __GFP_COMP |
+					       GFP_DMA32,
+					       get_order(MTK_WED_AMSDU_BUF_SIZE));
+		if (!ptr)
+			goto error;
+
+		wed_amsdu[i].txd = ptr;
+		wed_amsdu[i].txd_phy = dma_map_single(hw->dev, ptr,
+						      MTK_WED_AMSDU_BUF_SIZE,
+						      DMA_TO_DEVICE);
+		if (dma_mapping_error(hw->dev, wed_amsdu[i].txd_phy))
+			goto error;
+	}
+	dev->hw->wed_amsdu = wed_amsdu;
+
+	return 0;
+
+error:
+	for (i--; i >= 0; i--)
+		dma_unmap_single(hw->dev, wed_amsdu[i].txd_phy,
+				 MTK_WED_AMSDU_BUF_SIZE, DMA_TO_DEVICE);
+	return -ENOMEM;
+}
+
+static void
+mtk_wed_amsdu_free_buffer(struct mtk_wed_device *dev)
+{
+	struct mtk_wed_amsdu *wed_amsdu = dev->hw->wed_amsdu;
+	int i;
+
+	if (!wed_amsdu)
+		return;
+
+	for (i = 0; i < MTK_WED_AMSDU_NPAGES; i++) {
+		dma_unmap_single(dev->hw->dev, wed_amsdu[i].txd_phy,
+				 MTK_WED_AMSDU_BUF_SIZE, DMA_TO_DEVICE);
+		free_pages((unsigned long)wed_amsdu[i].txd,
+			   get_order(MTK_WED_AMSDU_BUF_SIZE));
+	}
+}
+
+static int
+mtk_wed_amsdu_init(struct mtk_wed_device *dev)
+{
+	struct mtk_wed_amsdu *wed_amsdu = dev->hw->wed_amsdu;
+	int i, ret;
+
+	if (!wed_amsdu)
+		return 0;
+
+	for (i = 0; i < MTK_WED_AMSDU_NPAGES; i++)
+		wed_w32(dev, MTK_WED_AMSDU_HIFTXD_BASE_L(i),
+			wed_amsdu[i].txd_phy);
+
+	/* init all sta parameter */
+	wed_w32(dev, MTK_WED_AMSDU_STA_INFO_INIT, MTK_WED_AMSDU_STA_RMVL |
+		MTK_WED_AMSDU_STA_WTBL_HDRT_MODE |
+		FIELD_PREP(MTK_WED_AMSDU_STA_MAX_AMSDU_LEN,
+			   dev->wlan.amsdu_max_len >> 8) |
+		FIELD_PREP(MTK_WED_AMSDU_STA_MAX_AMSDU_NUM,
+			   dev->wlan.amsdu_max_subframes));
+
+	wed_w32(dev, MTK_WED_AMSDU_STA_INFO, MTK_WED_AMSDU_STA_INFO_DO_INIT);
+
+	ret = mtk_wed_poll_busy(dev, MTK_WED_AMSDU_STA_INFO,
+				MTK_WED_AMSDU_STA_INFO_DO_INIT);
+	if (ret) {
+		dev_err(dev->hw->dev, "amsdu initialization failed\n");
+		return ret;
+	}
+
+	/* init partial amsdu offload txd src */
+	wed_set(dev, MTK_WED_AMSDU_HIFTXD_CFG,
+		FIELD_PREP(MTK_WED_AMSDU_HIFTXD_SRC, dev->hw->index));
+
+	/* init qmem */
+	wed_set(dev, MTK_WED_AMSDU_PSE, MTK_WED_AMSDU_PSE_RESET);
+	ret = mtk_wed_poll_busy(dev, MTK_WED_MON_AMSDU_QMEM_STS1, BIT(29));
+	if (ret) {
+		pr_info("%s: amsdu qmem initialization failed\n", __func__);
+		return ret;
+	}
+
+	/* eagle E1 PCIE1 tx ring 22 flow control issue */
+	if (dev->wlan.id == 0x7991)
+		wed_clr(dev, MTK_WED_AMSDU_FIFO, MTK_WED_AMSDU_IS_PRIOR0_RING);
+
+	wed_set(dev, MTK_WED_CTRL, MTK_WED_CTRL_TX_AMSDU_EN);
+
+	return 0;
+}
+
+static int
 mtk_wed_tx_buffer_alloc(struct mtk_wed_device *dev)
 {
 	u32 desc_size = dev->hw->soc->tx_ring_desc_size;
@@ -708,6 +839,7 @@ __mtk_wed_detach(struct mtk_wed_device *
 
 	mtk_wdma_rx_reset(dev);
 	mtk_wed_reset(dev, MTK_WED_RESET_WED);
+	mtk_wed_amsdu_free_buffer(dev);
 	mtk_wed_free_tx_buffer(dev);
 	mtk_wed_free_tx_rings(dev);
 
@@ -1128,23 +1260,6 @@ mtk_wed_ring_reset(struct mtk_wed_ring *
 	}
 }
 
-static u32
-mtk_wed_check_busy(struct mtk_wed_device *dev, u32 reg, u32 mask)
-{
-	return !!(wed_r32(dev, reg) & mask);
-}
-
-static int
-mtk_wed_poll_busy(struct mtk_wed_device *dev, u32 reg, u32 mask)
-{
-	int sleep = 15000;
-	int timeout = 100 * sleep;
-	u32 val;
-
-	return read_poll_timeout(mtk_wed_check_busy, val, !val, sleep,
-				 timeout, false, dev, reg, mask);
-}
-
 static int
 mtk_wed_rx_reset(struct mtk_wed_device *dev)
 {
@@ -1691,6 +1806,7 @@ mtk_wed_start(struct mtk_wed_device *dev
 	}
 
 	mtk_wed_set_512_support(dev, dev->wlan.wcid_512);
+	mtk_wed_amsdu_init(dev);
 
 	mtk_wed_dma_enable(dev);
 	dev->running = true;
@@ -1747,6 +1863,10 @@ mtk_wed_attach(struct mtk_wed_device *de
 	if (ret)
 		goto out;
 
+	ret = mtk_wed_amsdu_buffer_alloc(dev);
+	if (ret)
+		goto out;
+
 	if (mtk_wed_get_rx_capa(dev)) {
 		ret = mtk_wed_rro_alloc(dev);
 		if (ret)
--- a/drivers/net/ethernet/mediatek/mtk_wed.h
+++ b/drivers/net/ethernet/mediatek/mtk_wed.h
@@ -25,6 +25,11 @@ struct mtk_wed_soc_data {
 	u32 wdma_desc_size;
 };
 
+struct mtk_wed_amsdu {
+	void *txd;
+	dma_addr_t txd_phy;
+};
+
 struct mtk_wed_hw {
 	const struct mtk_wed_soc_data *soc;
 	struct device_node *node;
@@ -38,6 +43,7 @@ struct mtk_wed_hw {
 	struct dentry *debugfs_dir;
 	struct mtk_wed_device *wed_dev;
 	struct mtk_wed_wo *wed_wo;
+	struct mtk_wed_amsdu *wed_amsdu;
 	u32 pcie_base;
 	u32 debugfs_reg;
 	u32 num_flows;
@@ -52,6 +58,7 @@ struct mtk_wdma_info {
 	u8 queue;
 	u16 wcid;
 	u8 bss;
+	u8 amsdu;
 };
 
 #ifdef CONFIG_NET_MEDIATEK_SOC_WED
--- a/drivers/net/ethernet/mediatek/mtk_wed_regs.h
+++ b/drivers/net/ethernet/mediatek/mtk_wed_regs.h
@@ -672,6 +672,82 @@ struct mtk_wdma_desc {
 #define MTK_WED_WOCPU_VIEW_MIOD_BASE			0x8000
 #define MTK_WED_PCIE_INT_MASK				0x0
 
+#define MTK_WED_AMSDU_FIFO				0x1800
+#define MTK_WED_AMSDU_IS_PRIOR0_RING			BIT(10)
+
+#define MTK_WED_AMSDU_STA_INFO				0x01810
+#define MTK_WED_AMSDU_STA_INFO_DO_INIT			BIT(0)
+#define MTK_WED_AMSDU_STA_INFO_SET_INIT			BIT(1)
+
+#define MTK_WED_AMSDU_STA_INFO_INIT			0x01814
+#define MTK_WED_AMSDU_STA_WTBL_HDRT_MODE		BIT(0)
+#define MTK_WED_AMSDU_STA_RMVL				BIT(1)
+#define MTK_WED_AMSDU_STA_MAX_AMSDU_LEN			GENMASK(7, 2)
+#define MTK_WED_AMSDU_STA_MAX_AMSDU_NUM			GENMASK(11, 8)
+
+#define MTK_WED_AMSDU_HIFTXD_BASE_L(_n)			(0x1980 + (_n) * 0x4)
+
+#define MTK_WED_AMSDU_PSE				0x1910
+#define MTK_WED_AMSDU_PSE_RESET				BIT(16)
+
+#define MTK_WED_AMSDU_HIFTXD_CFG			0x1968
+#define MTK_WED_AMSDU_HIFTXD_SRC			GENMASK(16, 15)
+
+#define MTK_WED_MON_AMSDU_FIFO_DMAD			0x1a34
+
+#define MTK_WED_MON_AMSDU_ENG_DMAD(_n)			(0x1a80 + (_n) * 0x50)
+#define MTK_WED_MON_AMSDU_ENG_QFPL(_n)			(0x1a84 + (_n) * 0x50)
+#define MTK_WED_MON_AMSDU_ENG_QENI(_n)			(0x1a88 + (_n) * 0x50)
+#define MTK_WED_MON_AMSDU_ENG_QENO(_n)			(0x1a8c + (_n) * 0x50)
+#define MTK_WED_MON_AMSDU_ENG_MERG(_n)			(0x1a90 + (_n) * 0x50)
+
+#define MTK_WED_MON_AMSDU_ENG_CNT8(_n)			(0x1a94 + (_n) * 0x50)
+#define MTK_WED_AMSDU_ENG_MAX_QGPP_CNT			GENMASK(10, 0)
+#define MTK_WED_AMSDU_ENG_MAX_PL_CNT			GENMASK(27, 16)
+
+#define MTK_WED_MON_AMSDU_ENG_CNT9(_n)			(0x1a98 + (_n) * 0x50)
+#define MTK_WED_AMSDU_ENG_CUR_ENTRY			GENMASK(10, 0)
+#define MTK_WED_AMSDU_ENG_MAX_BUF_MERGED		GENMASK(20, 16)
+#define MTK_WED_AMSDU_ENG_MAX_MSDU_MERGED		GENMASK(28, 24)
+
+#define MTK_WED_MON_AMSDU_QMEM_STS1			0x1e04
+
+#define MTK_WED_MON_AMSDU_QMEM_CNT(_n)			(0x1e0c + (_n) * 0x4)
+#define MTK_WED_AMSDU_QMEM_FQ_CNT			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_SP_QCNT			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID0_QCNT			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID1_QCNT			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID2_QCNT			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID3_QCNT			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID4_QCNT			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID5_QCNT			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID6_QCNT			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID7_QCNT			GENMASK(11, 0)
+
+#define MTK_WED_MON_AMSDU_QMEM_PTR(_n)			(0x1e20 + (_n) * 0x4)
+#define MTK_WED_AMSDU_QMEM_FQ_HEAD			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_SP_QHEAD			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID0_QHEAD			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID1_QHEAD			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID2_QHEAD			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID3_QHEAD			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID4_QHEAD			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID5_QHEAD			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID6_QHEAD			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID7_QHEAD			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_FQ_TAIL			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_SP_QTAIL			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID0_QTAIL			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID1_QTAIL			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID2_QTAIL			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID3_QTAIL			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID4_QTAIL			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID5_QTAIL			GENMASK(11, 0)
+#define MTK_WED_AMSDU_QMEM_TID6_QTAIL			GENMASK(27, 16)
+#define MTK_WED_AMSDU_QMEM_TID7_QTAIL			GENMASK(11, 0)
+
+#define MTK_WED_MON_AMSDU_HIFTXD_FETCH_MSDU(_n)		(0x1ec4 + (_n) * 0x4)
+
 #define MTK_WED_PCIE_BASE			0x11280000
 #define MTK_WED_PCIE_BASE0			0x11300000
 #define MTK_WED_PCIE_BASE1			0x11310000
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -917,6 +917,7 @@ struct net_device_path {
 			u8 queue;
 			u16 wcid;
 			u8 bss;
+			u8 amsdu;
 		} mtk_wdma;
 	};
 };
--- a/include/linux/soc/mediatek/mtk_wed.h
+++ b/include/linux/soc/mediatek/mtk_wed.h
@@ -128,6 +128,7 @@ struct mtk_wed_device {
 		enum mtk_wed_bus_tye bus_type;
 		void __iomem *base;
 		u32 phy_base;
+		u32 id;
 
 		u32 wpdma_phys;
 		u32 wpdma_int;
@@ -146,10 +147,12 @@ struct mtk_wed_device {
 		unsigned int rx_nbuf;
 		unsigned int rx_npkt;
 		unsigned int rx_size;
+		unsigned int amsdu_max_len;
 
 		u8 tx_tbit[MTK_WED_TX_QUEUES];
 		u8 rx_tbit[MTK_WED_RX_QUEUES];
 		u8 txfree_tbit;
+		u8 amsdu_max_subframes;
 
 		u32 (*init_buf)(void *ptr, dma_addr_t phys, int token_id);
 		int (*offload_enable)(struct mtk_wed_device *wed);
@@ -223,6 +226,15 @@ static inline bool mtk_wed_get_rx_capa(s
 #else
 	return false;
 #endif
+}
+
+static inline bool mtk_wed_is_amsdu_supported(struct mtk_wed_device *dev)
+{
+#ifdef CONFIG_NET_MEDIATEK_SOC_WED
+	return dev->version == 3;
+#else
+	return false;
+#endif
 }
 
 #ifdef CONFIG_NET_MEDIATEK_SOC_WED
