netdev - [net-next 05/16] i40evf: Allow for an abundance of vectors

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Message-Id: <1436778517-16254-6-git-send-email-jeffrey.t.kirsher@intel.com>
Date:	Mon, 13 Jul 2015 02:08:26 -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-next 05/16] i40evf: Allow for an abundance of vectors

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

The driver currently only maps TX and RX queues to a single MSI-X vector
per queue pair if there are exactly enough vectors for this.
Unfortunately, if we have too many vectors it will fail and allocate
queues to vectors in a suboptimal manner. Change the condition check to
allow for excess vectors. In this case, the extras just won't be used.

Change-ID: I23e1e2955c64739c86612db88a25583e6a7e0b17
Signed-off-by: Mitch Williams <mitch.a.williams@...el.com>
Tested-by: Jim Young <james.m.young@...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 4ab4ebb..94eff4a 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -406,7 +406,7 @@ static int i40evf_map_rings_to_vectors(struct i40evf_adapter *adapter)
 	/* The ideal configuration...
 	 * We have enough vectors to map one per queue.
 	 */
-	if (q_vectors == (rxr_remaining * 2)) {
+	if (q_vectors >= (rxr_remaining * 2)) {
 		for (; rxr_idx < rxr_remaining; v_start++, rxr_idx++)
 			i40evf_map_vector_to_rxq(adapter, v_start, rxr_idx);
 
-- 
2.4.3

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