ethernet/realtek: use core min/max MTU checking

8139cp: min_mtu 60, max_mtu 4096

8139too: min_mtu 68, max_mtu 1770

r8169: min_mtu 60, max_mtu depends on chipset, 1500 to 9k-ish

CC: netdev@vger.kernel.org
CC: Realtek linux nic maintainers <nic_swsd@realtek.com>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 12 insertions, 17 deletions

diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index 5297bf77211c..b7c89ebcf4a2 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -1277,10 +1277,6 @@ static int cp_change_mtu(struct net_device *dev, int new_mtu)
 {
         struct cp_private *cp = netdev_priv(dev);
 
-        /* check for invalid MTU, according to hardware limits */
-        if (new_mtu < CP_MIN_MTU || new_mtu > CP_MAX_MTU)
-                return -EINVAL;
-
         /* if network interface not up, no need for complexity */
         if (!netif_running(dev)) {
                 dev->mtu = new_mtu;
@@ -2010,6 +2006,10 @@ static int cp_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
         dev->vlan_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO |
                 NETIF_F_HIGHDMA;
 
+        /* MTU range: 60 - 4096 */
+        dev->min_mtu = CP_MIN_MTU;
+        dev->max_mtu = CP_MAX_MTU;
+
         rc = register_netdev(dev);
         if (rc)
                 goto err_out_iomap;
diff --git a/drivers/net/ethernet/realtek/8139too.c b/drivers/net/ethernet/realtek/8139too.c
index da4c2d8a4173..9bc047ac883b 100644
--- a/drivers/net/ethernet/realtek/8139too.c
+++ b/drivers/net/ethernet/realtek/8139too.c
@@ -924,19 +924,10 @@ static int rtl8139_set_features(struct net_device *dev, netdev_features_t featur
         return 0;
 }
 
-static int rtl8139_change_mtu(struct net_device *dev, int new_mtu)
-{
-        if (new_mtu < 68 || new_mtu > MAX_ETH_DATA_SIZE)
-                return -EINVAL;
-        dev->mtu = new_mtu;
-        return 0;
-}
-
 static const struct net_device_ops rtl8139_netdev_ops = {
         .ndo_open               = rtl8139_open,
         .ndo_stop               = rtl8139_close,
         .ndo_get_stats64        = rtl8139_get_stats64,
-        .ndo_change_mtu         = rtl8139_change_mtu,
         .ndo_validate_addr      = eth_validate_addr,
         .ndo_set_mac_address    = rtl8139_set_mac_address,
         .ndo_start_xmit         = rtl8139_start_xmit,
@@ -1022,6 +1013,10 @@ static int rtl8139_init_one(struct pci_dev *pdev,
         dev->hw_features |= NETIF_F_RXALL;
         dev->hw_features |= NETIF_F_RXFCS;
 
+        /* MTU range: 68 - 1770 */
+        dev->min_mtu = ETH_MIN_MTU;
+        dev->max_mtu = MAX_ETH_DATA_SIZE;
+
         /* tp zeroed and aligned in alloc_etherdev */
         tp = netdev_priv(dev);
 
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index e55638c7505a..b698ea544bfc 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -6673,10 +6673,6 @@ static int rtl8169_change_mtu(struct net_device *dev, int new_mtu)
 {
         struct rtl8169_private *tp = netdev_priv(dev);
 
-        if (new_mtu < ETH_ZLEN ||
-            new_mtu > rtl_chip_infos[tp->mac_version].jumbo_max)
-                return -EINVAL;
-
         if (new_mtu > ETH_DATA_LEN)
                 rtl_hw_jumbo_enable(tp);
         else
@@ -8430,6 +8426,10 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
         dev->hw_features |= NETIF_F_RXALL;
         dev->hw_features |= NETIF_F_RXFCS;
 
+        /* MTU range: 60 - hw-specific max */
+        dev->min_mtu = ETH_ZLEN;
+        dev->max_mtu = rtl_chip_infos[chipset].jumbo_max;
+
         tp->hw_start = cfg->hw_start;
         tp->event_slow = cfg->event_slow;