netdev - [PATCH v1 6/7] net: mvneta: Don't use GRO on Armada 3720

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Date:   Wed,  8 Aug 2018 17:27:05 +0200
From:   Marek Behún <marek.behun@....cz>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Gregory CLEMENT <gregory.clement@...tlin.com>,
        Tomas Hlavacek <tomas.hlavacek@....cz>,
        Marek Behún <marek.behun@....cz>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        netdev@...r.kernel.org
Subject: [PATCH v1 6/7] net: mvneta: Don't use GRO on Armada 3720

For some reason on Armada 3720 boards (EspressoBin and Turris Mox) the
networking driver behaves weirdly when using napi_gro_receive.

For example downloading a big file from a local network (low ping) is
fast, but when downloading from a remote server (higher ping), the
download speed is at first high but drops rapidly to almost nothing or
absolutely nothing.

This is fixed when using netif_receive_skb instead of napi_gro_receive.

Signed-off-by: Marek Behun <marek.behun@....cz>
Cc: Russell King - ARM Linux <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 0ad2f3f7da85..27f3017d94c5 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1959,7 +1959,10 @@ static int mvneta_rx_swbm(struct mvneta_port *pp, int rx_todo,
 
 			skb->protocol = eth_type_trans(skb, dev);
 			mvneta_rx_csum(pp, rx_status, skb);
-			napi_gro_receive(&port->napi, skb);
+			if (pp->neta_armada3700)
+				netif_receive_skb(skb);
+			else
+				napi_gro_receive(&port->napi, skb);
 
 			rcvd_pkts++;
 			rcvd_bytes += rx_bytes;
@@ -2001,7 +2004,10 @@ static int mvneta_rx_swbm(struct mvneta_port *pp, int rx_todo,
 
 		mvneta_rx_csum(pp, rx_status, skb);
 
-		napi_gro_receive(&port->napi, skb);
+		if (pp->neta_armada3700)
+			netif_receive_skb(skb);
+		else
+			napi_gro_receive(&port->napi, skb);
 	}
 
 	if (rcvd_pkts) {
-- 
2.16.4