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

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Date:	Wed,  2 Oct 2013 12:49:33 +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 77/77] vxge: 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/neterion/vxge/vxge-main.c |   36 ++++++++++-------------
 1 files changed, 16 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/neterion/vxge/vxge-main.c b/drivers/net/ethernet/neterion/vxge/vxge-main.c
index b81ff8b..b4d40dd 100644
--- a/drivers/net/ethernet/neterion/vxge/vxge-main.c
+++ b/drivers/net/ethernet/neterion/vxge/vxge-main.c
@@ -2297,7 +2297,21 @@ static int vxge_alloc_msix(struct vxgedev *vdev)
 	int msix_intr_vect = 0, temp;
 	vdev->intr_cnt = 0;
 
-start:
+	ret = pci_msix_table_size(vdev->pdev);
+	if (ret < 0)
+		goto alloc_entries_failed;
+
+	if (ret < (vdev->no_of_vpath * 2 + 1)) {
+		if ((max_config_vpath != VXGE_USE_DEFAULT) || (ret < 3)) {
+			ret = -ENOSPC;
+			goto alloc_entries_failed;
+		}
+		/* Try with less no of vector by reducing no of vpaths count */
+		temp = (ret - 1)/2;
+		vxge_close_vpaths(vdev, temp);
+		vdev->no_of_vpath = temp;
+	}
+
 	/* Tx/Rx MSIX Vectors count */
 	vdev->intr_cnt = vdev->no_of_vpath * 2;
 
@@ -2347,25 +2361,7 @@ start:
 	vdev->vxge_entries[j].in_use = 0;
 
 	ret = pci_enable_msix(vdev->pdev, vdev->entries, vdev->intr_cnt);
-	if (ret > 0) {
-		vxge_debug_init(VXGE_ERR,
-			"%s: MSI-X enable failed for %d vectors, ret: %d",
-			VXGE_DRIVER_NAME, vdev->intr_cnt, ret);
-		if ((max_config_vpath != VXGE_USE_DEFAULT) || (ret < 3)) {
-			ret = -ENOSPC;
-			goto enable_msix_failed;
-		}
-
-		kfree(vdev->entries);
-		kfree(vdev->vxge_entries);
-		vdev->entries = NULL;
-		vdev->vxge_entries = NULL;
-		/* Try with less no of vector by reducing no of vpaths count */
-		temp = (ret - 1)/2;
-		vxge_close_vpaths(vdev, temp);
-		vdev->no_of_vpath = temp;
-		goto start;
-	} else if (ret < 0)
+	if (ret)
 		goto enable_msix_failed;
 	return 0;
 
-- 
1.7.7.6

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