i40evf: enable adaptive interrupt throttling

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%.

Change-ID: I9cd7d42c025b906bf1bb85c6aeb6112684aa6471
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 064419e48f21ab1635752eecc1860aaca5390f22..302c9743ef4411044cacd6e3a982c0dbf595c9de 100644 (file)
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -370,6 +370,8 @@ 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;
@@ -377,7 +379,10 @@ 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);
 }
 
 /**
@@ -391,6 +396,8 @@ 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;
@@ -398,9 +405,10 @@ 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);
 }
 
 /**
@@ -2269,10 +2277,8 @@ 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) {