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From:   Matteo Croce <mcroce@redhat.com>
To:     netdev@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
        Russell King <rmk+kernel@armlinux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        Stefan Chulski <stefanc@marvell.com>
Subject: [PATCH net] mvpp2: enable rxhash only on the first port
Date:   Sat,  9 May 2020 16:15:46 +0200
Message-Id: <20200509141546.5750-1-mcroce@redhat.com>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Currently rxhash only works on the first port of the CP (Communication
Processor). Enabling it on other ports completely blocks packet reception.
This patch only adds rxhash as supported feature to the first port,
so rxhash can't be enabled on other ports:

	# ethtool -K eth0 rxhash on
	# ethtool -K eth1 rxhash on
	# ethtool -K eth2 rxhash on
	Cannot change receive-hashing
	Could not change any device features
	# ethtool -K eth3 rxhash on
	Cannot change receive-hashing
	Could not change any device features

Fixes: 895586d5dc32 ("net: mvpp2: cls: Use RSS contexts to handle RSS tables")
Signed-off-by: Matteo Croce <mcroce@redhat.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 2b5dad2ec650..ba71583c7ae3 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -5423,7 +5423,8 @@ static int mvpp2_port_probe(struct platform_device *pdev,
 			    NETIF_F_HW_VLAN_CTAG_FILTER;
 
 	if (mvpp22_rss_is_supported()) {
-		dev->hw_features |= NETIF_F_RXHASH;
+		if (port->id == 0)
+			dev->hw_features |= NETIF_F_RXHASH;
 		dev->features |= NETIF_F_NTUPLE;
 	}
 
-- 
2.26.2