[PATCH net 2/2] net: stmmac: tc: Do not setup flower filtering if RSS is enabled

Jose Abreu Jose.Abreu at synopsys.com
Fri Jan 10 07:23:53 PST 2020

RSS, when enabled, will bypass the L3 and L4 filtering causing it not
to work. Add a check before trying to setup the filters.

Fixes: 425eabddaf0f ("net: stmmac: Implement L3/L4 Filters using TC Flower")
Signed-off-by: Jose Abreu <Jose.Abreu at synopsys.com>

Cc: Giuseppe Cavallaro <peppe.cavallaro at st.com>
Cc: Alexandre Torgue <alexandre.torgue at st.com>
Cc: Jose Abreu <joabreu at synopsys.com>
Cc: "David S. Miller" <davem at davemloft.net>
Cc: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
Cc: netdev at vger.kernel.org
Cc: linux-stm32 at st-md-mailman.stormreply.com
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
 drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 7d972e0fd2b0..9ffae12a2122 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -577,6 +577,10 @@ static int tc_setup_cls(struct stmmac_priv *priv,
 	int ret = 0;
+	/* When RSS is enabled, the filtering will be bypassed */
+	if (priv->rss.enable)
+		return -EBUSY;
 	switch (cls->command) {
 		ret = tc_add_flow(priv, cls);

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