From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754201AbbG2UiU (ORCPT ); Wed, 29 Jul 2015 16:38:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33806 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752897AbbG2UiQ (ORCPT ); Wed, 29 Jul 2015 16:38:16 -0400 Subject: [PATCH v2 1/2] igb: Teardown SR-IOV before unregister_netdev() From: Alex Williamson To: intel-wired-lan@lists.osuosl.org, davem@davemloft.net, jeffrey.t.kirsher@intel.com Cc: netdev@vger.kernel.org, mitch.a.williams@intel.com, linux-kernel@vger.kernel.org Date: Wed, 29 Jul 2015 14:38:15 -0600 Message-ID: <20150729203814.10732.38094.stgit@gimli.home> In-Reply-To: <20150729203726.10732.91020.stgit@gimli.home> References: <20150729203726.10732.91020.stgit@gimli.home> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When the .remove() callback for a PF is called, SR-IOV support for the device is disabled, which requires unbinding and removing the VFs. The VFs may be in-use either by the host kernel or userspace, such as assigned to a VM through vfio-pci. In this latter case, the VFs may be removed either by shutting down the VM or hot-unplugging the devices from the VM. Unfortunately in the case of a Windows 2012 R2 guest, hot-unplug is broken due to the ordering of the PF driver teardown. Disabling SR-IOV prior to unregister_netdev() avoids this issue. Signed-off-by: Alex Williamson Acked-by: Mitch Williams --- drivers/net/ethernet/intel/igb/igb_main.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 2f70a9b..417cc9c 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -2805,14 +2805,14 @@ static void igb_remove(struct pci_dev *pdev) */ igb_release_hw_control(adapter); - unregister_netdev(netdev); - - igb_clear_interrupt_scheme(adapter); - #ifdef CONFIG_PCI_IOV igb_disable_sriov(pdev); #endif + unregister_netdev(netdev); + + igb_clear_interrupt_scheme(adapter); + pci_iounmap(pdev, hw->hw_addr); if (hw->flash_address) iounmap(hw->flash_address); From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Williamson Date: Wed, 29 Jul 2015 14:38:15 -0600 Subject: [Intel-wired-lan] [PATCH v2 1/2] igb: Teardown SR-IOV before unregister_netdev() In-Reply-To: <20150729203726.10732.91020.stgit@gimli.home> References: <20150729203726.10732.91020.stgit@gimli.home> Message-ID: <20150729203814.10732.38094.stgit@gimli.home> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: When the .remove() callback for a PF is called, SR-IOV support for the device is disabled, which requires unbinding and removing the VFs. The VFs may be in-use either by the host kernel or userspace, such as assigned to a VM through vfio-pci. In this latter case, the VFs may be removed either by shutting down the VM or hot-unplugging the devices from the VM. Unfortunately in the case of a Windows 2012 R2 guest, hot-unplug is broken due to the ordering of the PF driver teardown. Disabling SR-IOV prior to unregister_netdev() avoids this issue. Signed-off-by: Alex Williamson Acked-by: Mitch Williams --- drivers/net/ethernet/intel/igb/igb_main.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 2f70a9b..417cc9c 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -2805,14 +2805,14 @@ static void igb_remove(struct pci_dev *pdev) */ igb_release_hw_control(adapter); - unregister_netdev(netdev); - - igb_clear_interrupt_scheme(adapter); - #ifdef CONFIG_PCI_IOV igb_disable_sriov(pdev); #endif + unregister_netdev(netdev); + + igb_clear_interrupt_scheme(adapter); + pci_iounmap(pdev, hw->hw_addr); if (hw->flash_address) iounmap(hw->flash_address);