From cfb3f91af49dff9b50de6929dc4de06100c4cfa8 Mon Sep 17 00:00:00 2001
From: Shannon Nelson <shannon.nelson@intel.com>
Date: Tue, 24 Nov 2009 18:51:06 +0000
Subject: [PATCH] ixgbe: handle parameters for tx and rx EITR, no div0
The driver was doing a divide by zero when adjusting tx-usecs.
This patch removes the divide by zero code and changes the logic slightly
to ignore tx-usecs in the case of shared TxRx vectors.
Cc: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ixgbe/ixgbe_ethtool.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index 84ab4db7074f..a5ca289efc94 100644
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -1972,6 +1972,10 @@ static int ixgbe_get_coalesce(struct net_device *netdev,
break;
}
+ /* if in mixed tx/rx queues per vector mode, report only rx settings */
+ if (adapter->q_vector[0]->txr_count && adapter->q_vector[0]->rxr_count)
+ return 0;
+
/* only valid if in constant ITR mode */
switch (adapter->tx_itr_setting) {
case 0:
@@ -1997,12 +2001,9 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
struct ixgbe_q_vector *q_vector;
int i;
- /*
- * don't accept tx specific changes if we've got mixed RxTx vectors
- * test and jump out here if needed before changing the rx numbers
- */
- if ((1000000/ec->tx_coalesce_usecs) != adapter->tx_eitr_param &&
- adapter->q_vector[0]->txr_count && adapter->q_vector[0]->rxr_count)
+ /* don't accept tx specific changes if we've got mixed RxTx vectors */
+ if (adapter->q_vector[0]->txr_count && adapter->q_vector[0]->rxr_count
+ && ec->tx_coalesce_usecs)
return -EINVAL;
if (ec->tx_max_coalesced_frames_irq)