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net: systemport: Clear status to reduce spurious interrupts 

Do something similar to commit d5810ca325 ("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.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2017-03-23 10:36:47 -07:00 committed by David S. Miller
parent 30defeb2fb
commit 6baa785a9c
1 changed files with 10 additions and 0 deletions
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10
drivers/net/ethernet/broadcom/bcmsysport.c
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@ -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;