[PATCH v2 net-next 1/5] net: stmmac: introduce DMA interrupt status masking per traffic direction

From: Voon Weifeng
Date: Thu Mar 25 2021 - 13:40:16 EST

Next message: Voon Weifeng: "[PATCH v2 net-next 0/5] net: stmmac: enable multi-vector MSI"
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In reply to: Voon Weifeng: "[PATCH v2 net-next 0/5] net: stmmac: enable multi-vector MSI"
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From: Ong Boon Leong <boon.leong.ong@xxxxxxxxx>

In preparation to make stmmac support multi-vector MSI, we introduce the
interrupt status masking according to RX, TX or RXTX. Default to use RXTX
inside stmmac_dma_interrupt(), so there is no run-time logic difference
now.

Signed-off-by: Ong Boon Leong <boon.leong.ong@xxxxxxxxx>
Signed-off-by: Voon Weifeng <weifeng.voon@xxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/common.h | 6 +++++
.../net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 24 ++++++++++++++++++-
.../net/ethernet/stmicro/stmmac/dwmac4_dma.h | 21 +++++++++++++++-
.../net/ethernet/stmicro/stmmac/dwmac4_lib.c | 7 +++++-
.../net/ethernet/stmicro/stmmac/dwmac_dma.h | 22 ++++++++++++++++-
.../net/ethernet/stmicro/stmmac/dwmac_lib.c | 8 ++++++-
.../net/ethernet/stmicro/stmmac/dwxgmac2.h | 6 +++++
.../ethernet/stmicro/stmmac/dwxgmac2_dma.c | 8 ++++++-
drivers/net/ethernet/stmicro/stmmac/hwif.h | 2 +-
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 7 +++---
10 files changed, 101 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index d065b11b7b10..5afb36a5c94c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -309,6 +309,12 @@ 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)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
index 6b75cf2603ff..e0bd08978fd6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -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++;
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h
index 8391ca63d943..5c0c53832adb 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h
@@ -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);
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
index 71e50751ef2d..3fa602dabf49 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
@@ -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))
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h b/drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h
index e5dbd0bc257e..1914ad698cab 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h
@@ -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__ */
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
index 57a53a600aa5..d1c31200bb91 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
@@ -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)) {
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
index 6c3b8a950f58..1913385df685 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
@@ -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)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
index f2cab5b76732..906e985441a9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
@@ -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)) {
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 45edac5f60db..c9cf89e21a41 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -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);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 170296820af0..7c352d017eb2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2337,10 +2337,10 @@ 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;

@@ -2386,7 +2386,8 @@ 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)) {
--
2.17.1

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