i40evf: enable adaptive interrupt throttling

Orabug: 24568124

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>
(cherry picked from commit f19a973f46e85d4394cadb90fa7717f7ec98197a)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index f5d741e287c6fc0f70a43163fcac2648b698eb2b..3c98704f6a8f007b68f46d2fa8f1323b12888658 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);
 }
 
 /**
@@ -2262,10 +2270,8 @@ 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) {