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i40evf: add new write-back mode

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Add write-back on interrupt throttle rate timer expiration support
for the i40evf driver, when running on X722 devices.

Signed-off-by: Anjali Singhai Jain <anjali.singhai@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:
Anjali Singhai Jain 2015-12-22 14:25:07 -08:00 committed by Jeff Kirsher
parent 3d0da5b782
commit f6d83d1376
3 changed files with 27 additions and 0 deletions
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6
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
View File

@ -1222,6 +1222,12 @@ static int i40e_vc_get_vf_resources_msg(struct i40e_vf *vf, u8 *msg)
if (vf->driver_caps & I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING)
vfres->vf_offload_flags |= I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING;
if (pf->flags & I40E_FLAG_WB_ON_ITR_CAPABLE) {
if (vf->driver_caps & I40E_VIRTCHNL_VF_OFFLOAD_WB_ON_ITR)
vfres->vf_offload_flags |=
I40E_VIRTCHNL_VF_OFFLOAD_WB_ON_ITR;
}
vfres->num_vsis = num_vsis;
vfres->num_queue_pairs = vf->num_queue_pairs;
vfres->max_vectors = pf->hw.func_caps.num_msix_vectors_vf;

16
drivers/net/ethernet/intel/i40evf/i40e_txrx.c
View File

@ -252,6 +252,22 @@ static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget)
tx_ring->q_vector->tx.total_bytes += total_bytes;
tx_ring->q_vector->tx.total_packets += total_packets;
if (tx_ring->flags & I40E_TXR_FLAGS_WB_ON_ITR) {
unsigned int j = 0;
/* check to see if there are < 4 descriptors
* waiting to be written back, then kick the hardware to force
* them to be written back in case we stay in NAPI.
* In this mode on X722 we do not enable Interrupt.
*/
j = i40evf_get_tx_pending(tx_ring);
if (budget &&
((j / (WB_STRIDE + 1)) == 0) && (j > 0) &&
!test_bit(__I40E_DOWN, &tx_ring->vsi->state) &&
(I40E_DESC_UNUSED(tx_ring) != tx_ring->count))
tx_ring->arm_wb = true;
}
netdev_tx_completed_queue(netdev_get_tx_queue(tx_ring->netdev,
tx_ring->queue_index),
total_packets, total_bytes);

5
drivers/net/ethernet/intel/i40evf/i40evf_main.c
View File

@ -2511,6 +2511,11 @@ static void i40evf_init_task(struct work_struct *work)
if (adapter->vf_res->vf_offload_flags &
I40E_VIRTCHNL_VF_OFFLOAD_WB_ON_ITR)
adapter->flags |= I40EVF_FLAG_WB_ON_ITR_CAPABLE;
if (adapter->vf_res->vf_offload_flags &
I40E_VIRTCHNL_VF_OFFLOAD_WB_ON_ITR)
adapter->flags |= I40EVF_FLAG_WB_ON_ITR_CAPABLE;
err = i40evf_request_misc_irq(adapter);
if (err)
goto err_sw_init;