From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1579813ACC; Sat, 13 Jan 2024 09:55:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fkIuxLbp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F67CC433F1; Sat, 13 Jan 2024 09:55:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1705139741; bh=U9jHDcDloyCQs7jevGfaJEwpwu42bYF6PdcysxC2gnA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fkIuxLbpiNlBOs11w8uNtcbiBT5kLq0xIY+muzBmoxq2XmK2lJ8ZIXJH1iyiPOpJV dQB19erQWIwOLWXqXMWW4zvtQd1mIj9FIriSg3zoStIWdWwzDxqO95vGc064r9eJJX LXU2dXF4FiZGi6rAwE/seRftX2i0VZwrEu0THxKQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Karen Ostrowska , Mateusz Palczewski , Wojciech Drewek , Przemek Kitszel , Andrii Staikov , Rafal Romanowski , Tony Nguyen , Sasha Levin Subject: [PATCH 5.4 15/38] i40e: Restore VF MSI-X state during PCI reset Date: Sat, 13 Jan 2024 10:49:51 +0100 Message-ID: <20240113094206.925972760@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240113094206.455533180@linuxfoundation.org> References: <20240113094206.455533180@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andrii Staikov [ Upstream commit 371e576ff3e8580d91d49026e5d5faebf5565558 ] During a PCI FLR the MSI-X Enable flag in the VF PCI MSI-X capability register will be cleared. This can lead to issues when a VF is assigned to a VM because in these cases the VF driver receives no indication of the PF PCI error/reset and additionally it is incapable of restoring the cleared flag in the hypervisor configuration space without fully reinitializing the driver interrupt functionality. Since the VF driver is unable to easily resolve this condition on its own, restore the VF MSI-X flag during the PF PCI reset handling. Fixes: 19b7960b2da1 ("i40e: implement split PCI error reset handler") Co-developed-by: Karen Ostrowska Signed-off-by: Karen Ostrowska Co-developed-by: Mateusz Palczewski Signed-off-by: Mateusz Palczewski Reviewed-by: Wojciech Drewek Reviewed-by: Przemek Kitszel Signed-off-by: Andrii Staikov Tested-by: Rafal Romanowski Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/i40e/i40e_main.c | 3 +++ .../ethernet/intel/i40e/i40e_virtchnl_pf.c | 26 +++++++++++++++++++ .../ethernet/intel/i40e/i40e_virtchnl_pf.h | 3 +++ 3 files changed, 32 insertions(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index b44ba73414831..fa938281281a4 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -15716,6 +15716,9 @@ static void i40e_pci_error_reset_done(struct pci_dev *pdev) struct i40e_pf *pf = pci_get_drvdata(pdev); i40e_reset_and_rebuild(pf, false, false); +#ifdef CONFIG_PCI_IOV + i40e_restore_all_vfs_msi_state(pdev); +#endif /* CONFIG_PCI_IOV */ } /** diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c index d53e535a447d6..e79b8dc5c2a5e 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c @@ -99,6 +99,32 @@ void i40e_vc_notify_reset(struct i40e_pf *pf) (u8 *)&pfe, sizeof(struct virtchnl_pf_event)); } +#ifdef CONFIG_PCI_IOV +void i40e_restore_all_vfs_msi_state(struct pci_dev *pdev) +{ + u16 vf_id; + u16 pos; + + /* Continue only if this is a PF */ + if (!pdev->is_physfn) + return; + + if (!pci_num_vf(pdev)) + return; + + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV); + if (pos) { + struct pci_dev *vf_dev = NULL; + + pci_read_config_word(pdev, pos + PCI_SRIOV_VF_DID, &vf_id); + while ((vf_dev = pci_get_device(pdev->vendor, vf_id, vf_dev))) { + if (vf_dev->is_virtfn && vf_dev->physfn == pdev) + pci_restore_msi_state(vf_dev); + } + } +} +#endif /* CONFIG_PCI_IOV */ + /** * i40e_vc_notify_vf_reset * @vf: pointer to the VF structure diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h index 23182731a73d0..75d916714ad8a 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.h @@ -141,5 +141,8 @@ int i40e_ndo_set_vf_spoofchk(struct net_device *netdev, int vf_id, bool enable); void i40e_vc_notify_link_state(struct i40e_pf *pf); void i40e_vc_notify_reset(struct i40e_pf *pf); +#ifdef CONFIG_PCI_IOV +void i40e_restore_all_vfs_msi_state(struct pci_dev *pdev); +#endif /* CONFIG_PCI_IOV */ #endif /* _I40E_VIRTCHNL_PF_H_ */ -- 2.43.0