Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 6baa785a authored by Florian Fainelli's avatar Florian Fainelli Committed by David S. Miller
Browse files

net: systemport: Clear status to reduce spurious interrupts 



Do something similar to commit d5810ca3 ("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: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 30defeb2

drivers/net/ethernet/broadcom/bcmsysport.c

+10 −0
Original line number Diff line number Diff line
@@ -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;