net: qualcomm: rmnet: add ethtool support for configuring tx aggregation

Add support for ETHTOOL_COALESCE_TX_AGGR for configuring the tx
aggregation settings.
Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c

@@ -215,7 +215,52 @@ static void rmnet_get_ethtool_stats(struct net_device *dev,
 	memcpy(data, st, ARRAY_SIZE(rmnet_gstrings_stats) * sizeof(u64));
 }
 
+static int rmnet_get_coalesce(struct net_device *dev,
+			      struct ethtool_coalesce *coal,
+			      struct kernel_ethtool_coalesce *kernel_coal,
+			      struct netlink_ext_ack *extack)
+{
+	struct rmnet_priv *priv = netdev_priv(dev);
+	struct rmnet_port *port;
+
+	port = rmnet_get_port_rtnl(priv->real_dev);
+
+	memset(kernel_coal, 0, sizeof(*kernel_coal));
+	kernel_coal->tx_aggr_max_bytes = port->egress_agg_params.bytes;
+	kernel_coal->tx_aggr_max_frames = port->egress_agg_params.count;
+	kernel_coal->tx_aggr_time_usecs = div_u64(port->egress_agg_params.time_nsec,
+						  NSEC_PER_USEC);
+
+	return 0;
+}
+
+static int rmnet_set_coalesce(struct net_device *dev,
+			      struct ethtool_coalesce *coal,
+			      struct kernel_ethtool_coalesce *kernel_coal,
+			      struct netlink_ext_ack *extack)
+{
+	struct rmnet_priv *priv = netdev_priv(dev);
+	struct rmnet_port *port;
+
+	port = rmnet_get_port_rtnl(priv->real_dev);
+
+	if (kernel_coal->tx_aggr_max_frames < 1 || kernel_coal->tx_aggr_max_frames > 64)
+		return -EINVAL;
+
+	if (kernel_coal->tx_aggr_max_bytes > 32768)
+		return -EINVAL;
+
+	rmnet_map_update_ul_agg_config(port, kernel_coal->tx_aggr_max_bytes,
+				       kernel_coal->tx_aggr_max_frames,
+				       kernel_coal->tx_aggr_time_usecs);
+
+	return 0;
+}
+
 static const struct ethtool_ops rmnet_ethtool_ops = {
+	.supported_coalesce_params = ETHTOOL_COALESCE_TX_AGGR,
+	.get_coalesce = rmnet_get_coalesce,
+	.set_coalesce = rmnet_set_coalesce,
 	.get_ethtool_stats = rmnet_get_ethtool_stats,
 	.get_strings = rmnet_get_strings,
 	.get_sset_count = rmnet_get_sset_count,