From patchwork Tue Jul 1 11:35:00 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirsher, Jeffrey T" X-Patchwork-Id: 366077 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 0EB1314008B for ; Tue, 1 Jul 2014 21:36:06 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757973AbaGALgA (ORCPT ); Tue, 1 Jul 2014 07:36:00 -0400 Received: from mga02.intel.com ([134.134.136.20]:7349 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757143AbaGALfP (ORCPT ); Tue, 1 Jul 2014 07:35:15 -0400 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP; 01 Jul 2014 04:35:14 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,581,1400050800"; d="scan'208";a="537091335" Received: from unknown (HELO jtkirshe-mobl.amr.corp.intel.com) ([10.255.12.189]) by orsmga001.jf.intel.com with ESMTP; 01 Jul 2014 04:35:14 -0700 From: Jeff Kirsher To: davem@davemloft.net Cc: Shannon Nelson , netdev@vger.kernel.org, gospo@redhat.com, sassmann@redhat.com, Jeff Kirsher Subject: [net-next 03/14] i40e: clear all queues and interrupts Date: Tue, 1 Jul 2014 04:35:00 -0700 Message-Id: <1404214511-26868-4-git-send-email-jeffrey.t.kirsher@intel.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1404214511-26868-1-git-send-email-jeffrey.t.kirsher@intel.com> References: <1404214511-26868-1-git-send-email-jeffrey.t.kirsher@intel.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Shannon Nelson 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 Signed-off-by: Jeff Kirsher --- 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,