linux-kernel - [PATCH RFC v2 28/29] vmxnet3: Limit number of rx queues to 1 if per-queue MSI-Xs failed

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Date:	Fri, 18 Oct 2013 19:12:28 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tejun Heo <tj@...nel.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	David Laight <David.Laight@...LAB.COM>,
	Mark Lord <kernel@...rt.ca>, "H. Peter Anvin" <hpa@...or.com>,
	linux-pci@...r.kernel.org
Subject: [PATCH RFC v2 28/29] vmxnet3: Limit number of rx queues to 1 if per-queue MSI-Xs failed

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/net/vmxnet3/vmxnet3_drv.c |   18 ++++++++----------
 1 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index 3df7f32..d33802c 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -2814,23 +2814,21 @@ vmxnet3_alloc_intr_resources(struct vmxnet3_adapter *adapter)
 
 		err = vmxnet3_acquire_msix_vectors(adapter,
 						   adapter->intr.num_intrs);
-		/* If we cannot allocate one MSIx vector per queue
-		 * then limit the number of rx queues to 1
-		 */
-		if (err == VMXNET3_LINUX_MIN_MSIX_VECT) {
-			if (adapter->share_intr != VMXNET3_INTR_BUDDYSHARE
-			    || adapter->num_rx_queues != 1) {
+		if (!err) {
+			/* If we cannot allocate one MSIx vector per queue
+			 * then limit the number of rx queues to 1
+			 */
+			if ((adapter->intr.num_intrs ==
+			     VMXNET3_LINUX_MIN_MSIX_VECT) &&
+			    ((adapter->share_intr != VMXNET3_INTR_BUDDYSHARE) ||
+			     (adapter->num_rx_queues != 1))) {
 				adapter->share_intr = VMXNET3_INTR_TXSHARE;
 				netdev_err(adapter->netdev,
 					   "Number of rx queues : 1\n");
 				adapter->num_rx_queues = 1;
-				adapter->intr.num_intrs =
-						VMXNET3_LINUX_MIN_MSIX_VECT;
 			}
 			return;
 		}
-		if (!err)
-			return;
 
 		/* If we cannot allocate MSIx vectors use only one rx queue */
 		dev_info(&adapter->pdev->dev,
-- 
1.7.7.6

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