From: =?UTF-8?q?Patryk=20Ma=C5=82ek?= <patryk.malek@intel.com>
Date: Wed, 27 Dec 2017 07:32:31 -0500
Subject: i40e: Fix for adding multiple ethtool filters on the same location
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Patch-mainline: v4.16-rc1
Git-commit: ca6e1d0abe863ac24c437ea407be84acd8aa373b
References: bsc#1101816 FATE#325147 FATE#325149

This patch reorders i40e_add_del_fdir and i40e_update_ethtool_fdir_entry
calls so that we first remove an already existing filter (inside
i40e_update_ethtool_fdir_entry using i40e_add_del_fdir) and then
we add a new one with i40e_add_del_fdir.
After applying this patch, creating multiple identical filters (with
the same location) one after another doesn't revert their behavior
but behaves correctly.

Signed-off-by: Patryk Małek <patryk.malek@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/i40e/i40e_ethtool.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -3937,19 +3937,19 @@ static int i40e_add_fdir_ethtool(struct
 		input->flex_offset = userdef.flex_offset;
 	}
 
-	ret = i40e_add_del_fdir(vsi, input, true);
-	if (ret)
-		goto free_input;
-
 	/* Add the input filter to the fdir_input_list, possibly replacing
 	 * a previous filter. Do not free the input structure after adding it
 	 * to the list as this would cause a use-after-free bug.
 	 */
 	i40e_update_ethtool_fdir_entry(vsi, input, fsp->location, NULL);
-
+	ret = i40e_add_del_fdir(vsi, input, true);
+	if (ret)
+		goto remove_sw_rule;
 	return 0;
 
-free_input:
+remove_sw_rule:
+	hlist_del(&input->fdir_node);
+	pf->fdir_pf_active_filters--;
 	kfree(input);
 	return ret;
 }