From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Mon, 8 Jun 2020 22:02:39 +0000 (+0200)
Subject: net: mvneta: do not redirect frames during reconfiguration
X-Git-Tag: v5.6.19~55
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=810805615c9735750aac945e0b6327bcd27efa4d;p=thirdparty%2Fkernel%2Fstable.git

net: mvneta: do not redirect frames during reconfiguration

[ Upstream commit 62a502cc91f97e3ffd312d9b42e8d01a137c63ff ]

Disable frames injection in mvneta_xdp_xmit routine during hw
re-configuration in order to avoid hardware hangs

Fixes: b0a43db9087a ("net: mvneta: add XDP_TX support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 11babc79dc6cb..14318dca69215 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -418,11 +418,17 @@ struct mvneta_pcpu_port {
 	u32			cause_rx_tx;
 };
 
+enum {
+	__MVNETA_DOWN,
+};
+
 struct mvneta_port {
 	u8 id;
 	struct mvneta_pcpu_port __percpu	*ports;
 	struct mvneta_pcpu_stats __percpu	*stats;
 
+	unsigned long state;
+
 	int pkt_size;
 	void __iomem *base;
 	struct mvneta_rx_queue *rxqs;
@@ -2066,6 +2072,9 @@ mvneta_xdp_xmit(struct net_device *dev, int num_frame,
 	int i, drops = 0;
 	u32 ret;
 
+	if (unlikely(test_bit(__MVNETA_DOWN, &pp->state)))
+		return -ENETDOWN;
+
 	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
 		return -EINVAL;
 
@@ -3489,12 +3498,16 @@ static void mvneta_start_dev(struct mvneta_port *pp)
 
 	phylink_start(pp->phylink);
 	netif_tx_start_all_queues(pp->dev);
+
+	clear_bit(__MVNETA_DOWN, &pp->state);
 }
 
 static void mvneta_stop_dev(struct mvneta_port *pp)
 {
 	unsigned int cpu;
 
+	set_bit(__MVNETA_DOWN, &pp->state);
+
 	phylink_stop(pp->phylink);
 
 	if (!pp->neta_armada3700) {