[Intel-wired-lan] [PATCH net v1] i40e: Fix adding ADq filter to TC0

[Jedzej Jagielski]

From: Grzegorz Szczurek <grzegorzx.szczurek at intel.com>

Procedure of configure tc flower filters erroneously allow to create
filters on TC0 where unfiltered packets are also directed by default.
Issue was caused by insufficient checks of hw_tc parameter specify
a hardware traffic class to pass matching packets on to.
Fix checking hw_tc parameter which blocks creation of filters on TC0.
Previously it was possible to create tc flower filters on TC0.

Fixes: 2f4b411a3d67 ("i40e: Enable cloud filters via tc-flower")
Signed-off-by: Grzegorz Szczurek <grzegorzx.szczurek at intel.com>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski at intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 1e074a6462d4..a0d5d696cdc1 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -8537,6 +8537,11 @@ static int i40e_configure_clsflower(struct i40e_vsi *vsi,
 		return -EOPNOTSUPP;
 	}
 
+	if (!tc) {
+		dev_err(&pf->pdev->dev, "Unable to add filter because of invalid destination");
+		return -EINVAL;
+	}
+
 	if (test_bit(__I40E_RESET_RECOVERY_PENDING, pf->state) ||
 	    test_bit(__I40E_RESET_INTR_RECEIVED, pf->state))
 		return -EBUSY;
-- 
2.27.0