netdev - [PATCH v2 net-next 04/10] bgmac: Add MTU configuration support to the driver

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Date:   Wed, 25 Mar 2020 17:22:03 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        davem@...emloft.net, jakub.kicinski@...ronome.com
Cc:     murali.policharla@...adcom.com, stephen@...workplumber.org,
        jiri@...nulli.us, idosch@...sch.org, kuba@...nel.org,
        nikolay@...ulusnetworks.com, netdev@...r.kernel.org
Subject: [PATCH v2 net-next 04/10] bgmac: Add MTU configuration support to the driver

From: Murali Krishna Policharla <murali.policharla@...adcom.com>

Add bgmac_change_mtu API to configure new mtu settings in bgmac driver.

Signed-off-by: Murali Krishna Policharla <murali.policharla@...adcom.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/broadcom/bgmac.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 1bb07a5d82c9..c530dff0353b 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -1248,6 +1248,14 @@ static int bgmac_set_mac_address(struct net_device *net_dev, void *addr)
 	return 0;
 }
 
+static int bgmac_change_mtu(struct net_device *net_dev, int mtu)
+{
+	struct bgmac *bgmac = netdev_priv(net_dev);
+
+	bgmac_write(bgmac, BGMAC_RXMAX_LENGTH, 32 + mtu);
+	return 0;
+}
+
 static const struct net_device_ops bgmac_netdev_ops = {
 	.ndo_open		= bgmac_open,
 	.ndo_stop		= bgmac_stop,
@@ -1256,6 +1264,7 @@ static const struct net_device_ops bgmac_netdev_ops = {
 	.ndo_set_mac_address	= bgmac_set_mac_address,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_do_ioctl           = phy_do_ioctl_running,
+	.ndo_change_mtu		= bgmac_change_mtu,
 };
 
 /**************************************************
@@ -1529,6 +1538,7 @@ int bgmac_enet_probe(struct bgmac *bgmac)
 	net_dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 	net_dev->hw_features = net_dev->features;
 	net_dev->vlan_features = net_dev->features;
+	net_dev->max_mtu = BGMAC_RX_MAX_FRAME_SIZE;
 
 	err = register_netdev(bgmac->net_dev);
 	if (err) {
-- 
2.17.1