linux-kernel - [PATCH RFC 66/77] qlge: Update MSI/MSI-X interrupts enablement code

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Message-Id: <5161bfdf162c8edd77d03e96312d48edb54242bc.1380703263.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:49:22 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Andy King <acking@...are.com>, Jon Mason <jon.mason@...el.com>,
	Matt Porter <mporter@...nel.crashing.org>,
	linux-pci@...r.kernel.org, linux-mips@...ux-mips.org,
	linuxppc-dev@...ts.ozlabs.org, linux390@...ibm.com,
	linux-s390@...r.kernel.org, x86@...nel.org,
	linux-ide@...r.kernel.org, iss_storagedev@...com,
	linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	linux-driver@...gic.com,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
	"VMware, Inc." <pv-drivers@...are.com>, linux-scsi@...r.kernel.org
Subject: [PATCH RFC 66/77] qlge: Update MSI/MSI-X interrupts enablement code

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/net/ethernet/qlogic/qlge/qlge_main.c |   39 +++++++++++--------------
 1 files changed, 17 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qlge/qlge_main.c b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
index ac54cb0..d6fdd93 100644
--- a/drivers/net/ethernet/qlogic/qlge/qlge_main.c
+++ b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
@@ -3258,45 +3258,40 @@ static void ql_enable_msix(struct ql_adapter *qdev)
 
 	/* Get the MSIX vectors. */
 	if (qlge_irq_type == MSIX_IRQ) {
+		err = pci_msix_table_size(qdev->pdev);
+		if (err < 0)
+			goto msix_fail;
+
+		qdev->intr_count = min_t(u32, qdev->intr_count, err);
+
 		/* Try to alloc space for the msix struct,
 		 * if it fails then go to MSI/legacy.
 		 */
 		qdev->msi_x_entry = kcalloc(qdev->intr_count,
 					    sizeof(struct msix_entry),
 					    GFP_KERNEL);
-		if (!qdev->msi_x_entry) {
-			qlge_irq_type = MSI_IRQ;
-			goto msi;
-		}
+		if (!qdev->msi_x_entry)
+			goto msix_fail;
 
 		for (i = 0; i < qdev->intr_count; i++)
 			qdev->msi_x_entry[i].entry = i;
 
-		/* Loop to get our vectors.  We start with
-		 * what we want and settle for what we get.
-		 */
-		do {
-			err = pci_enable_msix(qdev->pdev,
-				qdev->msi_x_entry, qdev->intr_count);
-			if (err > 0)
-				qdev->intr_count = err;
-		} while (err > 0);
-
-		if (err < 0) {
-			kfree(qdev->msi_x_entry);
-			qdev->msi_x_entry = NULL;
-			netif_warn(qdev, ifup, qdev->ndev,
-				   "MSI-X Enable failed, trying MSI.\n");
-			qlge_irq_type = MSI_IRQ;
-		} else if (err == 0) {
+		if (!pci_enable_msix(qdev->pdev,
+				     qdev->msi_x_entry, qdev->intr_count)) {
 			set_bit(QL_MSIX_ENABLED, &qdev->flags);
 			netif_info(qdev, ifup, qdev->ndev,
 				   "MSI-X Enabled, got %d vectors.\n",
 				   qdev->intr_count);
 			return;
 		}
+
+		kfree(qdev->msi_x_entry);
+		qdev->msi_x_entry = NULL;
+msix_fail:
+		netif_warn(qdev, ifup, qdev->ndev,
+			   "MSI-X Enable failed, trying MSI.\n");
+		qlge_irq_type = MSI_IRQ;
 	}
-msi:
 	qdev->intr_count = 1;
 	if (qlge_irq_type == MSI_IRQ) {
 		if (!pci_enable_msi(qdev->pdev)) {
-- 
1.7.7.6

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