linux-kernel - [PATCH 5.4 168/222] net: stmmac: tc: Do not setup flower filtering if RSS is enabled

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Date:   Wed, 22 Jan 2020 10:29:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jose Abreu <Jose.Abreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.4 168/222] net: stmmac: tc: Do not setup flower filtering if RSS is enabled

From: Jose Abreu <Jose.Abreu@...opsys.com>

commit 7bd754c47dd3ad1b048c9641294b0234fcce2c58 upstream.

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@...opsys.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -579,6 +579,10 @@ static int tc_setup_cls(struct stmmac_pr
 {
 	int ret = 0;
 
+	/* When RSS is enabled, the filtering will be bypassed */
+	if (priv->rss.enable)
+		return -EBUSY;
+
 	switch (cls->command) {
 	case FLOW_CLS_REPLACE:
 		ret = tc_add_flow(priv, cls);