netdev - [net-next 02/13] ixgbe: Avoid to write the RETA table when unnecessary

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Message-Id: <20180226180756.10736-3-jeffrey.t.kirsher@intel.com>
Date:   Mon, 26 Feb 2018 10:07:45 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Tonghao Zhang <xiangxia.m.yue@...il.com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 02/13] ixgbe: Avoid to write the RETA table when unnecessary

From: Tonghao Zhang <xiangxia.m.yue@...il.com>

If indir == 0 in the ixgbe_set_rxfh(), it is unnecessary
to write the HW. Because redirection table is not changed.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index 221f15803480..89edb9fae6f0 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -3059,6 +3059,8 @@ static int ixgbe_set_rxfh(struct net_device *netdev, const u32 *indir,
 
 		for (i = 0; i < reta_entries; i++)
 			adapter->rss_indir_tbl[i] = indir[i];
+
+		ixgbe_store_reta(adapter);
 	}
 
 	/* Fill out the rss hash key */
@@ -3067,8 +3069,6 @@ static int ixgbe_set_rxfh(struct net_device *netdev, const u32 *indir,
 		ixgbe_store_key(adapter);
 	}
 
-	ixgbe_store_reta(adapter);
-
 	return 0;
 }
 
-- 
2.14.3