Merge branch 'net-ethernet-mtk_wed-introduce-reset-support'

Lorenzo Bianconi says:

====================
net: ethernet: mtk_wed: introduce reset support

Introduce proper reset integration between ethernet and wlan drivers in order
to schedule wlan driver reset when ethernet/wed driver is resetting.
Introduce mtk_hw_reset_monitor work in order to detect possible DMA hangs.
====================

Link: https://lore.kernel.org/r/cover.1673715298.git.lorenzo@kernel.orgSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/mediatek/mtk_eth_soc.h

@@ -77,12 +77,24 @@
 #define	MTK_HW_LRO_REPLACE_DELTA	1000
 #define	MTK_HW_LRO_SDL_REMAIN_ROOM	1522
 
+/* Frame Engine Global Configuration */
+#define MTK_FE_GLO_CFG		0x00
+#define MTK_FE_LINK_DOWN_P3	BIT(11)
+#define MTK_FE_LINK_DOWN_P4	BIT(12)
+
 /* Frame Engine Global Reset Register */
 #define MTK_RST_GL		0x04
 #define RST_GL_PSE		BIT(0)
 
 /* Frame Engine Interrupt Status Register */
 #define MTK_INT_STATUS2		0x08
+#define MTK_FE_INT_ENABLE	0x0c
+#define MTK_FE_INT_FQ_EMPTY	BIT(8)
+#define MTK_FE_INT_TSO_FAIL	BIT(12)
+#define MTK_FE_INT_TSO_ILLEGAL	BIT(13)
+#define MTK_FE_INT_TSO_ALIGN	BIT(14)
+#define MTK_FE_INT_RFIFO_OV	BIT(18)
+#define MTK_FE_INT_RFIFO_UF	BIT(19)
 #define MTK_GDM1_AF		BIT(28)
 #define MTK_GDM2_AF		BIT(29)
 
@@ -272,6 +284,8 @@
 
 #define MTK_RX_DONE_INT_V2	BIT(14)
 
+#define MTK_CDM_TXFIFO_RDY	BIT(7)
+
 /* QDMA Interrupt grouping registers */
 #define MTK_RLS_DONE_INT	BIT(0)
 
@@ -562,6 +576,17 @@
 #define MT7628_SDM_RBCNT	(MT7628_SDM_OFFSET + 0x10c)
 #define MT7628_SDM_CS_ERR	(MT7628_SDM_OFFSET + 0x110)
 
+#define MTK_FE_CDM1_FSM		0x220
+#define MTK_FE_CDM2_FSM		0x224
+#define MTK_FE_CDM3_FSM		0x238
+#define MTK_FE_CDM4_FSM		0x298
+#define MTK_FE_CDM5_FSM		0x318
+#define MTK_FE_CDM6_FSM		0x328
+#define MTK_FE_GDM1_FSM		0x228
+#define MTK_FE_GDM2_FSM		0x22C
+
+#define MTK_MAC_FSM(x)		(0x1010C + ((x) * 0x100))
+
 struct mtk_rx_dma {
 	unsigned int rxd1;
 	unsigned int rxd2;
@@ -958,6 +983,7 @@ struct mtk_reg_map {
 		u32	delay_irq;	/* delay interrupt */
 		u32	irq_status;	/* interrupt status */
 		u32	irq_mask;	/* interrupt mask */
+		u32	adma_rx_dbg0;
 		u32	int_grp;
 	} pdma;
 	struct {
@@ -986,6 +1012,8 @@ struct mtk_reg_map {
 	u32	gdma_to_ppe;
 	u32	ppe_base;
 	u32	wdma_base[2];
+	u32	pse_iq_sta;
+	u32	pse_oq_sta;
 };
 
 /* struct mtk_eth_data -	This is the structure holding all differences
@@ -1028,6 +1056,8 @@ struct mtk_soc_data {
 	} txrx;
 };
 
+#define MTK_DMA_MONITOR_TIMEOUT		msecs_to_jiffies(1000)
+
 /* currently no SoC has more than 2 macs */
 #define MTK_MAX_DEVS			2
 
@@ -1152,6 +1182,14 @@ struct mtk_eth {
 	struct rhashtable		flow_table;
 
 	struct bpf_prog			__rcu *prog;
+
+	struct {
+		struct delayed_work monitor_work;
+		u32 wdidx;
+		u8 wdma_hang_count;
+		u8 qdma_hang_count;
+		u8 adma_hang_count;
+	} reset;
 };
 
 /* struct mtk_mac -	the structure that holds the info about the MACs of the

drivers/net/ethernet/mediatek/mtk_ppe.c

@@ -730,6 +730,33 @@ int mtk_foe_entry_idle_time(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
 	return __mtk_foe_entry_idle_time(ppe, entry->data.ib1);
 }
 
+int mtk_ppe_prepare_reset(struct mtk_ppe *ppe)
+{
+	if (!ppe)
+		return -EINVAL;
+
+	/* disable KA */
+	ppe_clear(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_CFG_KEEPALIVE);
+	ppe_clear(ppe, MTK_PPE_BIND_LMT1, MTK_PPE_NTU_KEEPALIVE);
+	ppe_w32(ppe, MTK_PPE_KEEPALIVE, 0);
+	usleep_range(10000, 11000);
+
+	/* set KA timer to maximum */
+	ppe_set(ppe, MTK_PPE_BIND_LMT1, MTK_PPE_NTU_KEEPALIVE);
+	ppe_w32(ppe, MTK_PPE_KEEPALIVE, 0xffffffff);
+
+	/* set KA tick select */
+	ppe_set(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_TICK_SEL);
+	ppe_set(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_CFG_KEEPALIVE);
+	usleep_range(10000, 11000);
+
+	/* disable scan mode */
+	ppe_clear(ppe, MTK_PPE_TB_CFG, MTK_PPE_TB_CFG_SCAN_MODE);
+	usleep_range(10000, 11000);
+
+	return mtk_ppe_wait_busy(ppe);
+}
+
 struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
 			     int version, int index)
 {

drivers/net/ethernet/mediatek/mtk_ppe.h

@@ -309,6 +309,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
 void mtk_ppe_deinit(struct mtk_eth *eth);
 void mtk_ppe_start(struct mtk_ppe *ppe);
 int mtk_ppe_stop(struct mtk_ppe *ppe);
+int mtk_ppe_prepare_reset(struct mtk_ppe *ppe);
 
 void __mtk_ppe_check_skb(struct mtk_ppe *ppe, struct sk_buff *skb, u16 hash);
 

drivers/net/ethernet/mediatek/mtk_ppe_regs.h

@@ -58,6 +58,12 @@
 #define MTK_PPE_TB_CFG_SCAN_MODE		GENMASK(17, 16)
 #define MTK_PPE_TB_CFG_HASH_DEBUG		GENMASK(19, 18)
 #define MTK_PPE_TB_CFG_INFO_SEL			BIT(20)
+#define MTK_PPE_TB_TICK_SEL			BIT(24)
+
+#define MTK_PPE_BIND_LMT1			0x230
+#define MTK_PPE_NTU_KEEPALIVE			GENMASK(23, 16)
+
+#define MTK_PPE_KEEPALIVE			0x234
 
 enum {
 	MTK_PPE_SCAN_MODE_DISABLED,

drivers/net/ethernet/mediatek/mtk_wed.c

@@ -206,6 +206,48 @@ mtk_wed_wo_reset(struct mtk_wed_device *dev)
 	iounmap(reg);
 }
 
+void mtk_wed_fe_reset(void)
+{
+	int i;
+
+	mutex_lock(&hw_lock);
+
+	for (i = 0; i < ARRAY_SIZE(hw_list); i++) {
+		struct mtk_wed_hw *hw = hw_list[i];
+		struct mtk_wed_device *dev = hw->wed_dev;
+		int err;
+
+		if (!dev || !dev->wlan.reset)
+			continue;
+
+		/* reset callback blocks until WLAN reset is completed */
+		err = dev->wlan.reset(dev);
+		if (err)
+			dev_err(dev->dev, "wlan reset failed: %d\n", err);
+	}
+
+	mutex_unlock(&hw_lock);
+}
+
+void mtk_wed_fe_reset_complete(void)
+{
+	int i;
+
+	mutex_lock(&hw_lock);
+
+	for (i = 0; i < ARRAY_SIZE(hw_list); i++) {
+		struct mtk_wed_hw *hw = hw_list[i];
+		struct mtk_wed_device *dev = hw->wed_dev;
+
+		if (!dev || !dev->wlan.reset_complete)
+			continue;
+
+		dev->wlan.reset_complete(dev);
+	}
+
+	mutex_unlock(&hw_lock);
+}
+
 static struct mtk_wed_hw *
 mtk_wed_assign(struct mtk_wed_device *dev)
 {

drivers/net/ethernet/mediatek/mtk_wed.h

@@ -128,6 +128,8 @@ void mtk_wed_add_hw(struct device_node *np, struct mtk_eth *eth,
 void mtk_wed_exit(void);
 int mtk_wed_flow_add(int index);
 void mtk_wed_flow_remove(int index);
+void mtk_wed_fe_reset(void);
+void mtk_wed_fe_reset_complete(void);
 #else
 static inline void
 mtk_wed_add_hw(struct device_node *np, struct mtk_eth *eth,
@@ -147,6 +149,13 @@ static inline void mtk_wed_flow_remove(int index)
 {
 }
 
+static inline void mtk_wed_fe_reset(void)
+{
+}
+
+static inline void mtk_wed_fe_reset_complete(void)
+{
+}
 #endif
 
 #ifdef CONFIG_DEBUG_FS

include/linux/soc/mediatek/mtk_wed.h

@@ -151,6 +151,8 @@ struct mtk_wed_device {
 		void (*release_rx_buf)(struct mtk_wed_device *wed);
 		void (*update_wo_rx_stats)(struct mtk_wed_device *wed,
 					   struct mtk_wed_wo_rx_stats *stats);
+		int (*reset)(struct mtk_wed_device *wed);
+		void (*reset_complete)(struct mtk_wed_device *wed);
 	} wlan;
 #endif
 };