netdev - [net 10/10] i40evf: don't configure unused RSS queues

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Message-Id: <1435314040-3228-11-git-send-email-jeffrey.t.kirsher@intel.com>
Date:	Fri, 26 Jun 2015 03:20:40 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Mitch Williams <mitch.a.williams@...el.com>,
	netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
	jogreene@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net 10/10] i40evf: don't configure unused RSS queues

From: Mitch Williams <mitch.a.williams@...el.com>

The driver will only configure as many queues as there are available
CPUs, up the maximum number of queues. However, it always configures
RSS as though it is using the maximum number of queues. This can cause
the device to drop a lot of RX traffic, as the packets get assigned to
nonfunctional queues.

Fix this by only configuring RSS with the number of active queues.

Signed-off-by: Mitch Williams <mitch.a.williams@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40evf/i40evf_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 5c73374..4ab4ebb 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -1461,7 +1461,7 @@ static void i40evf_configure_rss(struct i40evf_adapter *adapter)
 	for (i = 0; i <= I40E_VFQF_HLUT_MAX_INDEX; i++) {
 		lut = 0;
 		for (j = 0; j < 4; j++) {
-			if (cqueue == adapter->vsi_res->num_queue_pairs)
+			if (cqueue == adapter->num_active_queues)
 				cqueue = 0;
 			lut |= ((cqueue) << (8 * j));
 			cqueue++;
-- 
2.4.3

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