gve: Get and set Rx copybreak via ethtool

This adds support for getting and setting the RX copybreak
value via ethtool.

Reviewed-by: Yangchun Fu <yangchun@google.com>
Signed-off-by: Kuo Zhao <kuozhao@google.com>
Signed-off-by: David Awogbemila <awogbemila@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/google/gve/gve_ethtool.c b/drivers/net/ethernet/google/gve/gve_ethtool.c
index d8fa816..1a80d38 100644 (file)
--- a/drivers/net/ethernet/google/gve/gve_ethtool.c
+++ b/drivers/net/ethernet/google/gve/gve_ethtool.c
@@ -230,6 +230,38 @@ static int gve_user_reset(struct net_device *netdev, u32 *flags)
        return -EOPNOTSUPP;
 }
 
+static int gve_get_tunable(struct net_device *netdev,
+                          const struct ethtool_tunable *etuna, void *value)
+{
+       struct gve_priv *priv = netdev_priv(netdev);
+
+       switch (etuna->id) {
+       case ETHTOOL_RX_COPYBREAK:
+               *(u32 *)value = priv->rx_copybreak;
+               return 0;
+       default:
+               return -EOPNOTSUPP;
+       }
+}
+
+static int gve_set_tunable(struct net_device *netdev,
+                          const struct ethtool_tunable *etuna, const void *value)
+{
+       struct gve_priv *priv = netdev_priv(netdev);
+       u32 len;
+
+       switch (etuna->id) {
+       case ETHTOOL_RX_COPYBREAK:
+               len = *(u32 *)value;
+               if (len > PAGE_SIZE / 2)
+                       return -EINVAL;
+               priv->rx_copybreak = len;
+               return 0;
+       default:
+               return -EOPNOTSUPP;
+       }
+}
+
 const struct ethtool_ops gve_ethtool_ops = {
        .get_drvinfo = gve_get_drvinfo,
        .get_strings = gve_get_strings,
@@ -242,4 +274,6 @@ const struct ethtool_ops gve_ethtool_ops = {
        .get_link = ethtool_op_get_link,
        .get_ringparam = gve_get_ringparam,
        .reset = gve_user_reset,
+       .get_tunable = gve_get_tunable,
+       .set_tunable = gve_set_tunable,
 };