[RESEND v1 net-next 1/5] net: stmmac: introduce DMA interrupt status masking per traffic direction

@@ -303,6 +303,12 @@ enum dma_irq_status {
 	handle_tx = 0x8,
 };
 
+enum dma_irq_dir {
+	DMA_DIR_RX = 0x1,
+	DMA_DIR_TX = 0x2,
+	DMA_DIR_RXTX = 0x3,
+};
+
 /* EEE and LPI defines */
 #define	CORE_IRQ_TX_PATH_IN_LPI_MODE	(1 << 0)
 #define	CORE_IRQ_TX_PATH_EXIT_LPI_MODE	(1 << 1)

@@ -239,6 +239,22 @@ static const struct emac_variant emac_variant_h6 = {
 #define EMAC_RX_EARLY_INT       BIT(13)
 #define EMAC_RGMII_STA_INT      BIT(16)
 
+#define EMAC_INT_MSK_COMMON	EMAC_RGMII_STA_INT
+#define EMAC_INT_MSK_TX		(EMAC_TX_INT | \
+				 EMAC_TX_DMA_STOP_INT | \
+				 EMAC_TX_BUF_UA_INT | \
+				 EMAC_TX_TIMEOUT_INT | \
+				 EMAC_TX_UNDERFLOW_INT | \
+				 EMAC_TX_EARLY_INT |\
+				 EMAC_INT_MSK_COMMON)
+#define EMAC_INT_MSK_RX		(EMAC_RX_INT | \
+				 EMAC_RX_BUF_UA_INT | \
+				 EMAC_RX_DMA_STOP_INT | \
+				 EMAC_RX_TIMEOUT_INT | \
+				 EMAC_RX_OVERFLOW_INT | \
+				 EMAC_RX_EARLY_INT | \
+				 EMAC_INT_MSK_COMMON)
+
 #define MAC_ADDR_TYPE_DST BIT(31)
 
 /* H3 specific bits for EPHY */

@@ -412,13 +428,19 @@ static void sun8i_dwmac_dma_stop_rx(void __iomem *ioaddr, u32 chan)
 }
 
 static int sun8i_dwmac_dma_interrupt(void __iomem *ioaddr,
-				     struct stmmac_extra_stats *x, u32 chan)
+				     struct stmmac_extra_stats *x, u32 chan,
+				     u32 dir)
 {
 	u32 v;
 	int ret = 0;
 
 	v = readl(ioaddr + EMAC_INT_STA);
 
+	if (dir == DMA_DIR_RX)
+		v &= EMAC_INT_MSK_RX;
+	else if (dir == DMA_DIR_TX)
+		v &= EMAC_INT_MSK_TX;
+
 	if (v & EMAC_TX_INT) {
 		ret |= handle_tx;
 		x->tx_normal_irq_n++;

@@ -149,6 +149,25 @@
 #define DMA_CHAN_STATUS_TPS		BIT(1)
 #define DMA_CHAN_STATUS_TI		BIT(0)
 
+#define DMA_CHAN_STATUS_MSK_COMMON	(DMA_CHAN_STATUS_NIS | \
+					 DMA_CHAN_STATUS_AIS | \
+					 DMA_CHAN_STATUS_CDE | \
+					 DMA_CHAN_STATUS_FBE)
+
+#define DMA_CHAN_STATUS_MSK_RX		(DMA_CHAN_STATUS_REB | \
+					 DMA_CHAN_STATUS_ERI | \
+					 DMA_CHAN_STATUS_RWT | \
+					 DMA_CHAN_STATUS_RPS | \
+					 DMA_CHAN_STATUS_RBU | \
+					 DMA_CHAN_STATUS_RI | \
+					 DMA_CHAN_STATUS_MSK_COMMON)
+
+#define DMA_CHAN_STATUS_MSK_TX		(DMA_CHAN_STATUS_ETI | \
+					 DMA_CHAN_STATUS_TBU | \
+					 DMA_CHAN_STATUS_TPS | \
+					 DMA_CHAN_STATUS_TI | \
+					 DMA_CHAN_STATUS_MSK_COMMON)
+
 /* Interrupt enable bits per channel */
 #define DMA_CHAN_INTR_ENA_NIE		BIT(16)
 #define DMA_CHAN_INTR_ENA_AIE		BIT(15)

@@ -206,7 +225,7 @@ void dwmac4_dma_stop_tx(void __iomem *ioaddr, u32 chan);
 void dwmac4_dma_start_rx(void __iomem *ioaddr, u32 chan);
 void dwmac4_dma_stop_rx(void __iomem *ioaddr, u32 chan);
 int dwmac4_dma_interrupt(void __iomem *ioaddr,
-			 struct stmmac_extra_stats *x, u32 chan);
+			 struct stmmac_extra_stats *x, u32 chan, u32 dir);
 void dwmac4_set_rx_ring_len(void __iomem *ioaddr, u32 len, u32 chan);
 void dwmac4_set_tx_ring_len(void __iomem *ioaddr, u32 len, u32 chan);
 void dwmac4_set_rx_tail_ptr(void __iomem *ioaddr, u32 tail_ptr, u32 chan);

@@ -135,12 +135,17 @@ void dwmac410_disable_dma_irq(void __iomem *ioaddr, u32 chan, bool rx, bool tx)
 }
 
 int dwmac4_dma_interrupt(void __iomem *ioaddr,
-			 struct stmmac_extra_stats *x, u32 chan)
+			 struct stmmac_extra_stats *x, u32 chan, u32 dir)
 {
 	u32 intr_status = readl(ioaddr + DMA_CHAN_STATUS(chan));
 	u32 intr_en = readl(ioaddr + DMA_CHAN_INTR_ENA(chan));
 	int ret = 0;
 
+	if (dir == DMA_DIR_RX)
+		intr_status &= DMA_CHAN_STATUS_MSK_RX;
+	else if (dir == DMA_DIR_TX)
+		intr_status &= DMA_CHAN_STATUS_MSK_TX;
+
 	/* ABNORMAL interrupts */
 	if (unlikely(intr_status & DMA_CHAN_STATUS_AIS)) {
 		if (unlikely(intr_status & DMA_CHAN_STATUS_RBU))

@@ -128,6 +128,26 @@
 #define DMA_STATUS_TI	0x00000001	/* Transmit Interrupt */
 #define DMA_CONTROL_FTF		0x00100000	/* Flush transmit FIFO */
 
+#define DMA_STATUS_MSK_COMMON		(DMA_STATUS_NIS | \
+					 DMA_STATUS_AIS | \
+					 DMA_STATUS_FBI)
+
+#define DMA_STATUS_MSK_RX		(DMA_STATUS_ERI | \
+					 DMA_STATUS_RWT | \
+					 DMA_STATUS_RPS | \
+					 DMA_STATUS_RU | \
+					 DMA_STATUS_RI | \
+					 DMA_STATUS_OVF | \
+					 DMA_STATUS_MSK_COMMON)
+
+#define DMA_STATUS_MSK_TX		(DMA_STATUS_ETI | \
+					 DMA_STATUS_UNF | \
+					 DMA_STATUS_TJT | \
+					 DMA_STATUS_TU | \
+					 DMA_STATUS_TPS | \
+					 DMA_STATUS_TI | \
+					 DMA_STATUS_MSK_COMMON)
+
 #define NUM_DWMAC100_DMA_REGS	9
 #define NUM_DWMAC1000_DMA_REGS	23
 

@@ -139,7 +159,7 @@ void dwmac_dma_stop_tx(void __iomem *ioaddr, u32 chan);
 void dwmac_dma_start_rx(void __iomem *ioaddr, u32 chan);
 void dwmac_dma_stop_rx(void __iomem *ioaddr, u32 chan);
 int dwmac_dma_interrupt(void __iomem *ioaddr, struct stmmac_extra_stats *x,
-			u32 chan);
+			u32 chan, u32 dir);
 int dwmac_dma_reset(void __iomem *ioaddr);
 
 #endif /* __DWMAC_DMA_H__ */

@@ -155,7 +155,7 @@ static void show_rx_process_state(unsigned int status)
 #endif
 
 int dwmac_dma_interrupt(void __iomem *ioaddr,
-			struct stmmac_extra_stats *x, u32 chan)
+			struct stmmac_extra_stats *x, u32 chan, u32 dir)
 {
 	int ret = 0;
 	/* read the status register (CSR5) */

@@ -167,6 +167,12 @@ int dwmac_dma_interrupt(void __iomem *ioaddr,
 	show_tx_process_state(intr_status);
 	show_rx_process_state(intr_status);
 #endif
+
+	if (dir == DMA_DIR_RX)
+		intr_status &= DMA_STATUS_MSK_RX;
+	else if (dir == DMA_DIR_TX)
+		intr_status &= DMA_STATUS_MSK_TX;
+
 	/* ABNORMAL interrupts */
 	if (unlikely(intr_status & DMA_STATUS_AIS)) {
 		if (unlikely(intr_status & DMA_STATUS_UNF)) {

@@ -412,6 +412,12 @@
 #define XGMAC_TI			BIT(0)
 #define XGMAC_REGSIZE			((0x0000317c + (0x80 * 15)) / 4)
 
+#define XGMAC_DMA_STATUS_MSK_COMMON	(XGMAC_NIS | XGMAC_AIS | XGMAC_FBE)
+#define XGMAC_DMA_STATUS_MSK_RX		(XGMAC_RBU | XGMAC_RI | \
+					 XGMAC_DMA_STATUS_MSK_COMMON)
+#define XGMAC_DMA_STATUS_MSK_TX		(XGMAC_TBU | XGMAC_TPS | XGMAC_TI | \
+					 XGMAC_DMA_STATUS_MSK_COMMON)
+
 /* Descriptors */
 #define XGMAC_TDES0_LTV			BIT(31)
 #define XGMAC_TDES0_LT			GENMASK(7, 0)

@@ -323,12 +323,18 @@ static void dwxgmac2_dma_stop_rx(void __iomem *ioaddr, u32 chan)
 }
 
 static int dwxgmac2_dma_interrupt(void __iomem *ioaddr,
-				  struct stmmac_extra_stats *x, u32 chan)
+				  struct stmmac_extra_stats *x, u32 chan,
+				  u32 dir)
 {
 	u32 intr_status = readl(ioaddr + XGMAC_DMA_CH_STATUS(chan));
 	u32 intr_en = readl(ioaddr + XGMAC_DMA_CH_INT_EN(chan));
 	int ret = 0;
 
+	if (dir == DMA_DIR_RX)
+		intr_status &= XGMAC_DMA_STATUS_MSK_RX;
+	else if (dir == DMA_DIR_TX)
+		intr_status &= XGMAC_DMA_STATUS_MSK_TX;
+
 	/* ABNORMAL interrupts */
 	if (unlikely(intr_status & XGMAC_AIS)) {
 		if (unlikely(intr_status & XGMAC_RBU)) {

@@ -201,7 +201,7 @@ struct stmmac_dma_ops {
 	void (*start_rx)(void __iomem *ioaddr, u32 chan);
 	void (*stop_rx)(void __iomem *ioaddr, u32 chan);
 	int (*dma_interrupt) (void __iomem *ioaddr,
-			      struct stmmac_extra_stats *x, u32 chan);
+			      struct stmmac_extra_stats *x, u32 chan, u32 dir);
 	/* If supported then get the optional core features */
 	void (*get_hw_feature)(void __iomem *ioaddr,
 			       struct dma_features *dma_cap);

@@ -2301,10 +2301,10 @@ static bool stmmac_safety_feat_interrupt(struct stmmac_priv *priv)
 	return false;
 }
 
-static int stmmac_napi_check(struct stmmac_priv *priv, u32 chan)
+static int stmmac_napi_check(struct stmmac_priv *priv, u32 chan, u32 dir)
 {
 	int status = stmmac_dma_interrupt_status(priv, priv->ioaddr,
-						 &priv->xstats, chan);
+						 &priv->xstats, chan, dir);
 	struct stmmac_channel *ch = &priv->channel[chan];
 	unsigned long flags;
 

@@ -2350,7 +2350,8 @@ static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 		channels_to_check = ARRAY_SIZE(status);
 
 	for (chan = 0; chan < channels_to_check; chan++)
-		status[chan] = stmmac_napi_check(priv, chan);
+		status[chan] = stmmac_napi_check(priv, chan,
+						 DMA_DIR_RXTX);
 
 	for (chan = 0; chan < tx_channel_count; chan++) {
 		if (unlikely(status[chan] & tx_hard_error_bump_tc)) {