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Message-Id: <1404214511-26868-4-git-send-email-jeffrey.t.kirsher@intel.com>
Date: Tue, 1 Jul 2014 04:35:00 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Shannon Nelson <shannon.nelson@...el.com>, netdev@...r.kernel.org,
gospo@...hat.com, sassmann@...hat.com,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 03/14] i40e: clear all queues and interrupts
From: Shannon Nelson <shannon.nelson@...el.com>
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: Shannon Nelson <shannon.nelson@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/i40e/i40e_common.c | 93 ++++++++++++++++++++++++
drivers/net/ethernet/intel/i40e/i40e_main.c | 1 +
drivers/net/ethernet/intel/i40e/i40e_prototype.h | 1 +
3 files changed, 95 insertions(+)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index bbace40..8305c8a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -811,6 +811,99 @@ i40e_status i40e_pf_reset(struct i40e_hw *hw)
}
/**
+ * 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
*
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 17b1295..2c28538 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -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);
diff --git a/drivers/net/ethernet/intel/i40e/i40e_prototype.h b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
index 3300b99..77c515d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_prototype.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
@@ -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,
--
1.9.3
--
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