[PATCH net-next] net: stmmac: enable RPS and RBU interrupts

Russell King (Oracle)
2026-04-10T13:07:58Z

Enable receive process stopped and receive buffer unavailable
interrupts, so that the statistic counters can be updated.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
Since we are seeing receive buffer exhaustion on several platforms,
let's enable the interrupts so the statistics we publish via ethtool -S
actually work to aid diagnosis. I've been in two minds about whether
to send this patch, but given the problems with stmmac at the moment,
I think it should be merged.

drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h
index af6580332d49..43b036d4e95b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h
@@ -99,6 +99,8 @@ static inline u32 dma_chanx_base_addr(const struct dwmac4_addrs *addrs,
#define DMA_CHAN_INTR_ENA_NIE_4_10 BIT(15)
#define DMA_CHAN_INTR_ENA_AIE_4_10 BIT(14)
#define DMA_CHAN_INTR_ENA_FBE BIT(12)
+#define DMA_CHAN_INTR_ENA_RPS BIT(8)
+#define DMA_CHAN_INTR_ENA_RBU BIT(7)
#define DMA_CHAN_INTR_ENA_RIE BIT(6)
#define DMA_CHAN_INTR_ENA_TIE BIT(0)

@@ -107,6 +109,8 @@ static inline u32 dma_chanx_base_addr(const struct dwmac4_addrs *addrs,
DMA_CHAN_INTR_ENA_TIE)

#define DMA_CHAN_INTR_ABNORMAL (DMA_CHAN_INTR_ENA_AIE | \
+ DMA_CHAN_INTR_ENA_RPS | \
+ DMA_CHAN_INTR_ENA_RBU | \
DMA_CHAN_INTR_ENA_FBE)
/* DMA default interrupt mask for 4.00 */
#define DMA_CHAN_INTR_DEFAULT_MASK (DMA_CHAN_INTR_NORMAL | \
@@ -117,6 +121,8 @@ static inline u32 dma_chanx_base_addr(const struct dwmac4_addrs *addrs,
DMA_CHAN_INTR_ENA_TIE)

#define DMA_CHAN_INTR_ABNORMAL_4_10 (DMA_CHAN_INTR_ENA_AIE_4_10 | \
+ DMA_CHAN_INTR_ENA_RPS | \
+ DMA_CHAN_INTR_ENA_RBU | \
DMA_CHAN_INTR_ENA_FBE)
/* DMA default interrupt mask for 4.10a */
#define DMA_CHAN_INTR_DEFAULT_MASK_4_10 (DMA_CHAN_INTR_NORMAL_4_10 | \
--
2.47.3