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Commit 838d41d9 authored by Shannon Nelson's avatar Shannon Nelson Committed by Jeff Kirsher
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i40e: clear all queues and interrupts 



Per a recent HW designer comment, this code is for ripping through the
queues and interrupts to fully disable them on driver init, specifically
to help clean up after a PXE or other early boot activity.

Change-ID: I32ed452021a1c2b06dace1969976f882a37b9741
Signed-off-by: default avatarShannon Nelson <shannon.nelson@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 4346940b

drivers/net/ethernet/intel/i40e/i40e_common.c

+93 −0
Original line number Diff line number Diff line
@@ -810,6 +810,99 @@ i40e_status i40e_pf_reset(struct i40e_hw *hw) 
	return 0;

}



/**

 * i40e_clear_hw - clear out any left over hw state

 * @hw: pointer to the hw struct

 *

 * Clear queues and interrupts, typically called at init time,

 * but after the capabilities have been found so we know how many

 * queues and msix vectors have been allocated.

 **/

void i40e_clear_hw(struct i40e_hw *hw)

{

	u32 num_queues, base_queue;

	u32 num_pf_int;

	u32 num_vf_int;

	u32 num_vfs;

	u32 i, j;

	u32 val;

	u32 eol = 0x7ff;



	/* get number of interrupts, queues, and vfs */

	val = rd32(hw, I40E_GLPCI_CNF2);

	num_pf_int = (val & I40E_GLPCI_CNF2_MSI_X_PF_N_MASK) >>

		     I40E_GLPCI_CNF2_MSI_X_PF_N_SHIFT;

	num_vf_int = (val & I40E_GLPCI_CNF2_MSI_X_VF_N_MASK) >>

		     I40E_GLPCI_CNF2_MSI_X_VF_N_SHIFT;



	val = rd32(hw, I40E_PFLAN_QALLOC);

	base_queue = (val & I40E_PFLAN_QALLOC_FIRSTQ_MASK) >>

		     I40E_PFLAN_QALLOC_FIRSTQ_SHIFT;

	j = (val & I40E_PFLAN_QALLOC_LASTQ_MASK) >>

	    I40E_PFLAN_QALLOC_LASTQ_SHIFT;

	if (val & I40E_PFLAN_QALLOC_VALID_MASK)

		num_queues = (j - base_queue) + 1;

	else

		num_queues = 0;



	val = rd32(hw, I40E_PF_VT_PFALLOC);

	i = (val & I40E_PF_VT_PFALLOC_FIRSTVF_MASK) >>

	    I40E_PF_VT_PFALLOC_FIRSTVF_SHIFT;

	j = (val & I40E_PF_VT_PFALLOC_LASTVF_MASK) >>

	    I40E_PF_VT_PFALLOC_LASTVF_SHIFT;

	if (val & I40E_PF_VT_PFALLOC_VALID_MASK)

		num_vfs = (j - i) + 1;

	else

		num_vfs = 0;



	/* stop all the interrupts */

	wr32(hw, I40E_PFINT_ICR0_ENA, 0);

	val = 0x3 << I40E_PFINT_DYN_CTLN_ITR_INDX_SHIFT;

	for (i = 0; i < num_pf_int - 2; i++)

		wr32(hw, I40E_PFINT_DYN_CTLN(i), val);



	/* Set the FIRSTQ_INDX field to 0x7FF in PFINT_LNKLSTx */

	val = eol << I40E_PFINT_LNKLST0_FIRSTQ_INDX_SHIFT;

	wr32(hw, I40E_PFINT_LNKLST0, val);

	for (i = 0; i < num_pf_int - 2; i++)

		wr32(hw, I40E_PFINT_LNKLSTN(i), val);

	val = eol << I40E_VPINT_LNKLST0_FIRSTQ_INDX_SHIFT;

	for (i = 0; i < num_vfs; i++)

		wr32(hw, I40E_VPINT_LNKLST0(i), val);

	for (i = 0; i < num_vf_int - 2; i++)

		wr32(hw, I40E_VPINT_LNKLSTN(i), val);



	/* warn the HW of the coming Tx disables */

	for (i = 0; i < num_queues; i++) {

		u32 abs_queue_idx = base_queue + i;

		u32 reg_block = 0;



		if (abs_queue_idx >= 128) {

			reg_block = abs_queue_idx / 128;

			abs_queue_idx %= 128;

		}



		val = rd32(hw, I40E_GLLAN_TXPRE_QDIS(reg_block));

		val &= ~I40E_GLLAN_TXPRE_QDIS_QINDX_MASK;

		val |= (abs_queue_idx << I40E_GLLAN_TXPRE_QDIS_QINDX_SHIFT);

		val |= I40E_GLLAN_TXPRE_QDIS_SET_QDIS_MASK;



		wr32(hw, I40E_GLLAN_TXPRE_QDIS(reg_block), val);

	}

	udelay(400);



	/* stop all the queues */

	for (i = 0; i < num_queues; i++) {

		wr32(hw, I40E_QINT_TQCTL(i), 0);

		wr32(hw, I40E_QTX_ENA(i), 0);

		wr32(hw, I40E_QINT_RQCTL(i), 0);

		wr32(hw, I40E_QRX_ENA(i), 0);

	}



	/* short wait for all queue disables to settle */

	udelay(50);

}



/**

 * i40e_clear_pxe_mode - clear pxe operations mode

 * @hw: pointer to the hw struct

drivers/net/ethernet/intel/i40e/i40e_main.c

+1 −0
Original line number Diff line number Diff line
@@ -8636,6 +8636,7 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 
	}



	/* Reset here to make sure all is clean and to define PF 'n' */

	i40e_clear_hw(hw);

	err = i40e_pf_reset(hw);

	if (err) {

		dev_info(&pdev->dev, "Initial pf_reset failed: %d\n", err);

drivers/net/ethernet/intel/i40e/i40e_prototype.h

+1 −0
Original line number Diff line number Diff line
@@ -217,6 +217,7 @@ i40e_status i40e_aq_query_switch_comp_bw_config(struct i40e_hw *hw, 
/* i40e_common */

i40e_status i40e_init_shared_code(struct i40e_hw *hw);

i40e_status i40e_pf_reset(struct i40e_hw *hw);

void i40e_clear_hw(struct i40e_hw *hw);

void i40e_clear_pxe_mode(struct i40e_hw *hw);

bool i40e_get_link_status(struct i40e_hw *hw);

i40e_status i40e_get_mac_addr(struct i40e_hw *hw,