Do something similar to commit d5810ca3252a ("net: bcmgenet: clear
status to reduce spurious interrupts") and clear interrupts right before
servicing them. This reduces the number of interrupts by 10K
interrupts/sec for a TX TCP session 1Gbits/sec.
Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
---
drivers/net/ethernet/broadcom/bcmsysport.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c
b/drivers/net/ethernet/broadcom/bcmsysport.c
index 986fb05529fc..c915bcfae0af 100644
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -669,6 +669,9 @@ static unsigned int bcm_sysport_desc_rx(struct
bcm_sysport_priv *priv,
u16 len, status;
struct bcm_rsb *rsb;
+ /* Clear status before servicing to reduce spurious interrupts */
+ intrl2_0_writel(priv, INTRL2_0_RDMA_MBDONE, INTRL2_CPU_CLEAR);
+
/* Determine how much we should process since last call, SYSTEMPORT Lite
* groups the producer and consumer indexes into the same 32-bit
* which we access using RDMA_CONS_INDEX
@@ -814,6 +817,13 @@ static unsigned int __bcm_sysport_tx_reclaim(struct
bcm_sysport_priv *priv,
struct bcm_sysport_cb *cb;
u32 hw_ind;
+ /* Clear status before servicing to reduce spurious interrupts */
+ if (!ring->priv->is_lite)
+ intrl2_1_writel(ring->priv, BIT(ring->index), INTRL2_CPU_CLEAR);
+ else
+ intrl2_0_writel(ring->priv, BIT(ring->index +
+ INTRL2_0_TDMA_MBDONE_SHIFT), INTRL2_CPU_CLEAR);
+
/* Compute how many descriptors have been processed since last call */
hw_ind = tdma_readl(priv, TDMA_DESC_RING_PROD_CONS_INDEX(ring->index));
c_index = (hw_ind >> RING_CONS_INDEX_SHIFT) & RING_CONS_INDEX_MASK;
--
2.9.3
