From patchwork Tue Mar 11 16:00:22 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Gordeev X-Patchwork-Id: 329142 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id D62A02C00BD for ; Wed, 12 Mar 2014 02:58:27 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754189AbaCKP60 (ORCPT ); Tue, 11 Mar 2014 11:58:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:1207 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753646AbaCKP6Z (ORCPT ); Tue, 11 Mar 2014 11:58:25 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s2BFwOtM027221 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 11 Mar 2014 11:58:24 -0400 Received: from dhcp-26-207.brq.redhat.com (dhcp-27-68.brq.redhat.com [10.34.27.68]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s2BFwJiG009374 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Tue, 11 Mar 2014 11:58:22 -0400 Date: Tue, 11 Mar 2014 17:00:22 +0100 From: Alexander Gordeev To: linux-kernel@vger.kernel.org Cc: Jon Mason , linux-pci@vger.kernel.org Subject: [PATCH v2 3/4] ntb: Split ntb_setup_msix() into separate BWD/SNB routines Message-ID: <20140311160022.GA25638@dhcp-26-207.brq.redhat.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This is an cleanup effort to make ntb_setup_msix() more readable - use ntb_setup_bwd_msix() to init MSI-Xs on BWD hardware and ntb_setup_snb_msix() - on SNB hardware. Function ntb_setup_snb_msix() also initializes MSI-Xs the way it should has been done - looping pci_enable_msix() until success or failure. Signed-off-by: Alexander Gordeev Cc: Jon Mason Cc: linux-pci@vger.kernel.org --- drivers/ntb/ntb_hw.c | 167 ++++++++++++++++++++++++++++++------------------- 1 files changed, 102 insertions(+), 65 deletions(-) diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c index 53468f4..1f8decd 100644 --- a/drivers/ntb/ntb_hw.c +++ b/drivers/ntb/ntb_hw.c @@ -1079,10 +1079,106 @@ static irqreturn_t ntb_interrupt(int irq, void *dev) return IRQ_HANDLED; } -static int ntb_setup_msix(struct ntb_device *ndev) +static int ntb_setup_snb_msix(struct ntb_device *ndev, int msix_entries) { struct pci_dev *pdev = ndev->pdev; struct msix_entry *msix; + int rc, i; + + if (msix_entries < ndev->limits.msix_cnt) + return -ENOSPC; + + rc = pci_enable_msix(pdev, ndev->msix_entries, msix_entries); + if (rc < 0) + return rc; + else if (rc > 0) + return -ENOSPC; + + for (i = 0; i < msix_entries; i++) { + msix = &ndev->msix_entries[i]; + WARN_ON(!msix->vector); + + if (i == msix_entries - 1) { + rc = request_irq(msix->vector, + xeon_event_msix_irq, 0, + "ntb-event-msix", ndev); + if (rc) + goto err; + } else { + rc = request_irq(msix->vector, + xeon_callback_msix_irq, 0, + "ntb-callback-msix", + &ndev->db_cb[i]); + if (rc) + goto err; + } + } + + ndev->num_msix = msix_entries; + ndev->max_cbs = msix_entries - 1; + + return 0; + +err: + while (--i >= 0) { + /* Code never reaches here for entry nr 'ndev->num_msix - 1' */ + msix = &ndev->msix_entries[i]; + free_irq(msix->vector, &ndev->db_cb[i]); + } + + pci_disable_msix(pdev); + ndev->num_msix = 0; + + return rc; +} + +static int ntb_setup_bwd_msix(struct ntb_device *ndev, int msix_entries) +{ + struct pci_dev *pdev = ndev->pdev; + struct msix_entry *msix; + int rc, i; + +retry: + rc = pci_enable_msix(pdev, ndev->msix_entries, msix_entries); + if (rc < 0) + return rc; + else if (rc > 0) { + dev_warn(&pdev->dev, + "Only %d MSI-X vectors. " + "Limiting the number of queues to that number.\n", + rc); + msix_entries = rc; + goto retry; + } + + for (i = 0; i < msix_entries; i++) { + msix = &ndev->msix_entries[i]; + WARN_ON(!msix->vector); + + rc = request_irq(msix->vector, bwd_callback_msix_irq, 0, + "ntb-callback-msix", &ndev->db_cb[i]); + if (rc) + goto err; + } + + ndev->num_msix = msix_entries; + ndev->max_cbs = msix_entries; + + return 0; + +err: + while (--i >= 0) + free_irq(msix->vector, &ndev->db_cb[i]); + + pci_disable_msix(pdev); + ndev->num_msix = 0; + + return rc; +} + +static int ntb_setup_msix(struct ntb_device *ndev) +{ + struct pci_dev *pdev = ndev->pdev; int msix_entries; int rc, i; @@ -1105,78 +1201,19 @@ static int ntb_setup_msix(struct ntb_device *ndev) for (i = 0; i < msix_entries; i++) ndev->msix_entries[i].entry = i; - rc = pci_enable_msix(pdev, ndev->msix_entries, msix_entries); - if (rc < 0) - goto err1; - if (rc > 0) { - /* On SNB, the link interrupt is always tied to 4th vector. If - * we can't get all 4, then we can't use MSI-X. - */ - if (ndev->hw_type != BWD_HW) { - rc = -EIO; - goto err1; - } - - dev_warn(&pdev->dev, - "Only %d MSI-X vectors. Limiting the number of queues to that number.\n", - rc); - msix_entries = rc; - - rc = pci_enable_msix(pdev, ndev->msix_entries, msix_entries); - if (rc) - goto err1; - } - - for (i = 0; i < msix_entries; i++) { - msix = &ndev->msix_entries[i]; - WARN_ON(!msix->vector); - - /* Use the last MSI-X vector for Link status */ - if (ndev->hw_type == BWD_HW) { - rc = request_irq(msix->vector, bwd_callback_msix_irq, 0, - "ntb-callback-msix", &ndev->db_cb[i]); - if (rc) - goto err2; - } else { - if (i == msix_entries - 1) { - rc = request_irq(msix->vector, - xeon_event_msix_irq, 0, - "ntb-event-msix", ndev); - if (rc) - goto err2; - } else { - rc = request_irq(msix->vector, - xeon_callback_msix_irq, 0, - "ntb-callback-msix", - &ndev->db_cb[i]); - if (rc) - goto err2; - } - } - } - - ndev->num_msix = msix_entries; if (ndev->hw_type == BWD_HW) - ndev->max_cbs = msix_entries; + rc = ntb_setup_bwd_msix(ndev, msix_entries); else - ndev->max_cbs = msix_entries - 1; + rc = ntb_setup_snb_msix(ndev, msix_entries); + if (rc) + goto err1; return 0; -err2: - while (--i >= 0) { - msix = &ndev->msix_entries[i]; - if (ndev->hw_type != BWD_HW && i == ndev->num_msix - 1) - free_irq(msix->vector, ndev); - else - free_irq(msix->vector, &ndev->db_cb[i]); - } - pci_disable_msix(pdev); err1: kfree(ndev->msix_entries); - dev_err(&pdev->dev, "Error allocating MSI-X interrupt\n"); err: - ndev->num_msix = 0; + dev_err(&pdev->dev, "Error allocating MSI-X interrupt\n"); return rc; }