[Intel-wired-lan] [next PATCH S84-V2 02/13] i40e: Fix for adding multiple ethtool filters on the same location

[Malek, Patryk]

ACK

-----Original Message-----
From: Michael, Alice 
Sent: Wednesday, December 27, 2017 13:33
To: Michael, Alice <alice.michael at intel.com>; intel-wired-lan at lists.osuosl.org
Cc: Malek, Patryk <patryk.malek at intel.com>
Subject: [next PATCH S84-V2 02/13] i40e: Fix for adding multiple ethtool filters on the same location

From: Patryk Małek <patryk.malek at intel.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 at intel.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 86329a3..099b170 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;
 }
--
2.9.5

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