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Subject[PATCH net-next 3/3] net: stmmac: dwxgmac2: Also use TBU interrupt to clean TX path
Date
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>
---
drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h | 4 +++-
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c | 8 +++-----
2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
index d6bb953685fa..37d5e6fe7473 100644
--- 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 c5e25580a43f..2ba712b48a89 100644
--- 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;
}
--
2.7.4
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