linux-kernel - [PATCH net-next 5/6] net: mvneta: Verify hardware checksum only when offload checksum feature is set

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Date:   Fri,  6 Jul 2018 15:19:48 +0200
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Yelena Krivosheev <yelena@...vell.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Dmitri Epshtein <dima@...vell.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>
Subject: [PATCH net-next 5/6] net: mvneta: Verify hardware checksum only when offload checksum feature is set

From: Yelena Krivosheev <yelena@...vell.com>

If the checksum offload feature is not set, then there is no point to
check the status of the hardware.

[gregory: extract from a larger patch]
Signed-off-by: Yelena Krivosheev <yelena@...vell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
---
 drivers/net/ethernet/marvell/mvneta.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 12739fb60732..8fc4be238083 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1716,11 +1716,13 @@ static void mvneta_rx_error(struct mvneta_port *pp,
 static void mvneta_rx_csum(struct mvneta_port *pp, u32 status,
 			   struct sk_buff *skb)
 {
-	if ((status & MVNETA_RXD_L3_IP4) &&
-	    (status & MVNETA_RXD_L4_CSUM_OK)) {
-		skb->csum = 0;
-		skb->ip_summed = CHECKSUM_UNNECESSARY;
-		return;
+	if (pp->dev->features & NETIF_F_RXCSUM) {
+		if ((status & MVNETA_RXD_L3_IP4) &&
+		    (status & MVNETA_RXD_L4_CSUM_OK)) {
+			skb->csum = 0;
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+			return;
+		}
 	}
 
 	skb->ip_summed = CHECKSUM_NONE;
-- 
2.17.1