r8152: support ndo_features_check

Support ndo_features_check to avoid:
 - the transport offset is more than the hw limitation when using hw checksum.
 - the skb->len of a GSO packet is more than the limitation.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 2d1c77e..57ec23e 100644 (file)
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -1897,6 +1897,22 @@ static void _rtl8152_set_rx_mode(struct net_device *netdev)
        netif_wake_queue(netdev);
 }
 
+static netdev_features_t
+rtl8152_features_check(struct sk_buff *skb, struct net_device *dev,
+                      netdev_features_t features)
+{
+       u32 mss = skb_shinfo(skb)->gso_size;
+       int max_offset = mss ? GTTCPHO_MAX : TCPHO_MAX;
+       int offset = skb_transport_offset(skb);
+
+       if ((mss || skb->ip_summed == CHECKSUM_PARTIAL) && offset > max_offset)
+               features &= ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK);
+       else if ((skb->len + sizeof(struct tx_desc)) > agg_buf_sz)
+               features &= ~NETIF_F_GSO_MASK;
+
+       return features;
+}
+
 static netdev_tx_t rtl8152_start_xmit(struct sk_buff *skb,
                                      struct net_device *netdev)
 {
@@ -3706,6 +3722,7 @@ static const struct net_device_ops rtl8152_netdev_ops = {
        .ndo_set_mac_address    = rtl8152_set_mac_address,
        .ndo_change_mtu         = rtl8152_change_mtu,
        .ndo_validate_addr      = eth_validate_addr,
+       .ndo_features_check     = rtl8152_features_check,
 };
 
 static void r8152b_get_version(struct r8152 *tp)