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Commit f6d83d13 authored by Anjali Singhai Jain's avatar Anjali Singhai Jain Committed by Jeff Kirsher
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i40evf: add new write-back mode 



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

Signed-off-by: default avatarAnjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 3d0da5b7

drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c

+6 −0
Original line number Diff line number Diff line
@@ -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;

drivers/net/ethernet/intel/i40evf/i40e_txrx.c

+16 −0
Original line number Diff line number Diff line
@@ -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);

drivers/net/ethernet/intel/i40evf/i40evf_main.c

+5 −0
Original line number Diff line number Diff line
@@ -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;