net: stmmac: dwxgmac2: Also use TBU interrupt to clean TX path

TBU interrupt is a normal interrupt and can be used to trigger the
cleaning of TX path. Lets check if it's active in DMA interrupt handler.

While at it, refactor a little bit the function:
	- Don't check if RI is enabled because at function exit we will
	  only clear the interrupts that are enabled so, no event will
	  be missed.

In my tests withe XGMAC2 this increased performance.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
index d6bb953..37d5e6f 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
@@ -193,9 +193,10 @@
 #define XGMAC_AIE                      BIT(14)
 #define XGMAC_RBUE                     BIT(7)
 #define XGMAC_RIE                      BIT(6)
+#define XGMAC_TBUE                     BIT(2)
 #define XGMAC_TIE                      BIT(0)
 #define XGMAC_DMA_INT_DEFAULT_EN       (XGMAC_NIE | XGMAC_AIE | XGMAC_RBUE | \
-                                       XGMAC_RIE | XGMAC_TIE)
+                                       XGMAC_RIE | XGMAC_TBUE | XGMAC_TIE)
 #define XGMAC_DMA_CH_Rx_WATCHDOG(x)    (0x0000313c + (0x80 * (x)))
 #define XGMAC_RWT                      GENMASK(7, 0)
 #define XGMAC_DMA_CH_STATUS(x)         (0x00003160 + (0x80 * (x)))
@@ -204,6 +205,7 @@
 #define XGMAC_FBE                      BIT(12)
 #define XGMAC_RBU                      BIT(7)
 #define XGMAC_RI                       BIT(6)
+#define XGMAC_TBU                      BIT(2)
 #define XGMAC_TPS                      BIT(1)
 #define XGMAC_TI                       BIT(0)
 

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
index c5e2558..2ba712b 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
@@ -283,12 +283,10 @@ static int dwxgmac2_dma_interrupt(void __iomem *ioaddr,
                x->normal_irq_n++;
 
                if (likely(intr_status & XGMAC_RI)) {
-                       if (likely(intr_en & XGMAC_RIE)) {
-                               x->rx_normal_irq_n++;
-                               ret |= handle_rx;
-                       }
+                       x->rx_normal_irq_n++;
+                       ret |= handle_rx;
                }
-               if (likely(intr_status & XGMAC_TI)) {
+               if (likely(intr_status & (XGMAC_TI | XGMAC_TBU))) {
                        x->tx_normal_irq_n++;
                        ret |= handle_tx;
                }