netdev - [net-next 02/15] i40e: Fix for adding multiple ethtool filters on the same location

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Date:   Fri, 26 Jan 2018 13:24:46 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Patryk Małek <patryk.malek@...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 02/15] i40e: Fix for adding multiple ethtool filters on the same location

From: Patryk Małek <patryk.malek@...el.com>

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@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 34173f821fd9..2cbd564e437a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -3939,19 +3939,19 @@ static int i40e_add_fdir_ethtool(struct i40e_vsi *vsi,
 		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;
 }
-- 
2.14.3