[PATCH net v2] net: stmmac: selftests: Pass the IP proto mask in the TC selftest

[Maxime Chevallier <maxime.chevallier@bootlin.com>]

The stmmac TC filtering rules have recently gained sanity checks to make
sure the passed keys and their respective masks are aligned with the HW
filtering abilities.

The stmmac selftests failed to pass the mask in the match data for L4
filtering tests, and are now failing consistently with -EINVAL :

$ ethtool -t eth1
[...]
23. L4 DA TCP Filtering          -22
24. L4 SA TCP Filtering          -22
25. L4 DA UDP Filtering          -22
26. L4 SA UDP Filtering          -22

Let's pass the ip_proto mask in the l4 filtering tests match data. Found
on imx8mp, which now have passing L4 tests :

$ ethtool -t eth1
[...]
23. L4 DA TCP Filtering          0
24. L4 SA TCP Filtering          0
25. L4 DA UDP Filtering          0
26. L4 SA UDP Filtering          0

While at it, initialize the masks and keys to avoid re-using whatever
was on the stack.

Fixes: 5536d7c84363 ("net: stmmac: fix l3l4 filter rejecting unsupported offload requests")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
index 1df26c217f9a..a2b917dd60e5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
@@ -1432,11 +1432,11 @@ static int __stmmac_test_l4filt(struct stmmac_priv *priv, u32 dst, u32 src,
 	struct {
 		struct flow_dissector_key_basic bkey;
 		struct flow_dissector_key_ports key;
-	} __aligned(BITS_PER_LONG / 8) keys;
+	} __aligned(BITS_PER_LONG / 8) keys = { };
 	struct {
 		struct flow_dissector_key_basic bmask;
 		struct flow_dissector_key_ports mask;
-	} __aligned(BITS_PER_LONG / 8) masks;
+	} __aligned(BITS_PER_LONG / 8) masks = { };
 	unsigned long dummy_cookie = 0xdeadbeef;
 	struct stmmac_packet_attrs attr = { };
 	struct flow_dissector *dissector;
@@ -1489,6 +1489,8 @@ static int __stmmac_test_l4filt(struct stmmac_priv *priv, u32 dst, u32 src,
 	keys.bkey.ip_proto = udp ? IPPROTO_UDP : IPPROTO_TCP;
 	keys.key.src = htons(src);
 	keys.key.dst = htons(dst);
+	/* Match the full IP proto field */
+	masks.bmask.ip_proto = 0xff;
 	masks.mask.src = src_mask;
 	masks.mask.dst = dst_mask;
 
-- 
2.55.0