diff mbox

[next,S35,07/14] i40evf: Enable adaptive interrupt throttling

Message ID 1460639974-2556-8-git-send-email-harshitha.ramamurthy@intel.com
State Changes Requested
Headers show

Commit Message

Harshitha Ramamurthy April 14, 2016, 1:19 p.m. UTC 
From: Mitch Williams <mitch.a.williams@intel.com>

All of the code to support adaptive interrupt throttling is already in
the interrupt handler, it just needs to be enabled. Fill out the data
structures properly to make it happen. Single-flow traffic tests may
show slightly lower throughput, but interrupts per second will drop by
about 75%.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Change-Id: I5fb6185ec1cff491bd295c2587b415162393dc6d
---
Testing Hints : Use itop to monitor interrupt load
and run netperf.

 drivers/net/ethernet/intel/i40evf/i40evf_main.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index b9b1dd8..4c86687 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -368,6 +368,8 @@  i40evf_map_vector_to_rxq(struct i40evf_adapter *adapter, int v_idx, int r_idx)
 {
 	struct i40e_q_vector *q_vector = &adapter->q_vectors[v_idx];
 	struct i40e_ring *rx_ring = &adapter->rx_rings[r_idx];
+	struct i40e_vsi *vsi = &adapter->vsi;
+	struct i40e_hw *hw = &adapter->hw;
 
 	rx_ring->q_vector = q_vector;
 	rx_ring->next = q_vector->rx.ring;
@@ -375,7 +377,10 @@  i40evf_map_vector_to_rxq(struct i40evf_adapter *adapter, int v_idx, int r_idx)
 	q_vector->rx.ring = rx_ring;
 	q_vector->rx.count++;
 	q_vector->rx.latency_range = I40E_LOW_LATENCY;
+	q_vector->rx.itr = ITR_TO_REG(vsi->rx_itr_setting);
+	q_vector->ring_mask |= BIT(r_idx);
 	q_vector->itr_countdown = ITR_COUNTDOWN_START;
+	wr32(hw, I40E_VFINT_ITRN1(I40E_RX_ITR, v_idx - 1), q_vector->rx.itr);
 }
 
 /**
@@ -389,6 +394,8 @@  i40evf_map_vector_to_txq(struct i40evf_adapter *adapter, int v_idx, int t_idx)
 {
 	struct i40e_q_vector *q_vector = &adapter->q_vectors[v_idx];
 	struct i40e_ring *tx_ring = &adapter->tx_rings[t_idx];
+	struct i40e_vsi *vsi = &adapter->vsi;
+	struct i40e_hw *hw = &adapter->hw;
 
 	tx_ring->q_vector = q_vector;
 	tx_ring->next = q_vector->tx.ring;
@@ -396,9 +403,10 @@  i40evf_map_vector_to_txq(struct i40evf_adapter *adapter, int v_idx, int t_idx)
 	q_vector->tx.ring = tx_ring;
 	q_vector->tx.count++;
 	q_vector->tx.latency_range = I40E_LOW_LATENCY;
+	q_vector->tx.itr = ITR_TO_REG(vsi->tx_itr_setting);
 	q_vector->itr_countdown = ITR_COUNTDOWN_START;
 	q_vector->num_ringpairs++;
-	q_vector->ring_mask |= BIT(t_idx);
+	wr32(hw, I40E_VFINT_ITRN1(I40E_TX_ITR, v_idx - 1), q_vector->tx.itr);
 }
 
 /**
@@ -2271,10 +2279,8 @@  int i40evf_process_config(struct i40evf_adapter *adapter)
 	adapter->vsi.back = adapter;
 	adapter->vsi.base_vector = 1;
 	adapter->vsi.work_limit = I40E_DEFAULT_IRQ_WORK;
-	adapter->vsi.rx_itr_setting = (I40E_ITR_DYNAMIC |
-				       ITR_REG_TO_USEC(I40E_ITR_RX_DEF));
-	adapter->vsi.tx_itr_setting = (I40E_ITR_DYNAMIC |
-				       ITR_REG_TO_USEC(I40E_ITR_TX_DEF));
+	adapter->vsi.rx_itr_setting = (I40E_ITR_DYNAMIC | I40E_ITR_RX_DEF);
+	adapter->vsi.tx_itr_setting = (I40E_ITR_DYNAMIC | I40E_ITR_TX_DEF);
 	vsi->netdev = adapter->netdev;
 	vsi->qs_handle = adapter->vsi_res->qset_handle;
 	if (vfres->vf_offload_flags & I40E_VIRTCHNL_VF_OFFLOAD_RSS_PF) {