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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>
This commit is contained in:
Mitch Williams 2016-09-12 14:18:38 -07:00 committed by Jeff Kirsher
parent 7ac4b5c6fd
commit f19a973f46
1 changed files with 11 additions and 5 deletions
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16
drivers/net/ethernet/intel/i40evf/i40evf_main.c
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@ -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) {