[PATCH net-next 04/10] ice: increase OICR interrupt moderation rate to 20K interrupts/sec

[Tony Nguyen <anthony.l.nguyen@intel.com>]

From: Aleksandr Loktionov <aleksandr.loktionov@intel.com>

The miscellaneous interrupt cause (OICR) is throttled to 8K
interrupts per second (124 us minimum spacing). This interrupt
handles VF mailbox messages and Tx timestamps, so the low rate
imposes a minimum latency floor on both use-cases.

Raise the rate to 20K interrupts per second (50 us minimum
spacing) to allow lower latency handling for Tx timestamp
bursts and high VF message rates.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Alexander Nowlin <alexander.nowlin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 707c7431b91a..73f69d453542 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3428,7 +3428,7 @@ static int ice_req_irq_msix_misc(struct ice_pf *pf)
 		     ((pf->ll_ts_irq.index + pf_intr_start_offset) &
 		      PFINT_SB_CTL_MSIX_INDX_M) | PFINT_SB_CTL_CAUSE_ENA_M);
 	wr32(hw, GLINT_ITR(ICE_RX_ITR, pf->oicr_irq.index),
-	     ITR_REG_ALIGN(ICE_ITR_8K) >> ICE_ITR_GRAN_S);
+	     ITR_REG_ALIGN(ICE_ITR_20K) >> ICE_ITR_GRAN_S);
 
 	ice_flush(hw);
 	ice_irq_dynamic_ena(hw, NULL, NULL);
-- 
2.47.1