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net: mvneta: disable IP checksum with jumbo frames for Armada 370

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The Ethernet controller found in the Armada 370, 380 and 385 SoCs don't
support TCP/IP checksumming with frame sizes larger than 1600 bytes.

This patch fixes the issue by disabling the features NETIF_F_IP_CSUM and
NETIF_F_TSO for the Armada 370 and compatibles SoCs when the MTU is set
to a value greater than 1600 bytes.

Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Fixes: c5aff18204 ("net: mvneta: driver for Marvell Armada 370/XP network unit")
Cc: <stable@vger.kernel.org> # v3.8+
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Guinot 2015-06-30 16:20:22 +02:00 committed by David S. Miller
parent ea3b55fe83
commit b65657fc24
1 changed files with 25 additions and 1 deletions
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26
drivers/net/ethernet/marvell/mvneta.c
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@ -310,6 +310,7 @@ struct mvneta_port {
unsigned int link;
unsigned int duplex;
unsigned int speed;
unsigned int tx_csum_limit;
int use_inband_status:1;
};
@ -2508,8 +2509,10 @@ static int mvneta_change_mtu(struct net_device *dev, int mtu)
dev->mtu = mtu;
if (!netif_running(dev))
if (!netif_running(dev)) {
netdev_update_features(dev);
return 0;
}
/* The interface is running, so we have to force a
* reallocation of the queues
@ -2538,9 +2541,26 @@ static int mvneta_change_mtu(struct net_device *dev, int mtu)
mvneta_start_dev(pp);
mvneta_port_up(pp);
netdev_update_features(dev);
return 0;
}
static netdev_features_t mvneta_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct mvneta_port *pp = netdev_priv(dev);
if (pp->tx_csum_limit && dev->mtu > pp->tx_csum_limit) {
features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
netdev_info(dev,
"Disable IP checksum for MTU greater than %dB\n",
pp->tx_csum_limit);
}
return features;
}
/* Get mac address */
static void mvneta_get_mac_addr(struct mvneta_port *pp, unsigned char *addr)
{
@ -2862,6 +2882,7 @@ static const struct net_device_ops mvneta_netdev_ops = {
.ndo_set_rx_mode = mvneta_set_rx_mode,
.ndo_set_mac_address = mvneta_set_mac_addr,
.ndo_change_mtu = mvneta_change_mtu,
.ndo_fix_features = mvneta_fix_features,
.ndo_get_stats64 = mvneta_get_stats64,
.ndo_do_ioctl = mvneta_ioctl,
};
@ -3107,6 +3128,9 @@ static int mvneta_probe(struct platform_device *pdev)
}
}
if (of_device_is_compatible(dn, "marvell,armada-370-neta"))
pp->tx_csum_limit = 1600;
pp->tx_ring_size = MVNETA_MAX_TXD;
pp->rx_ring_size = MVNETA_MAX_RXD;