dpaa_eth: enable Rx hashing control

Allow ethtool control of the Rx flow hashing. By default RSS is
enabled, this allows to turn it off by bypassing the FMan Keygen
block and sending all traffic on the default Rx frame queue.
Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/dpaa/dpaa_ethtool.c

@@ -399,6 +399,117 @@ static void dpaa_get_strings(struct net_device *net_dev, u32 stringset,
 	memcpy(strings, dpaa_stats_global, size);
 }
 
+static int dpaa_get_hash_opts(struct net_device *dev,
+			      struct ethtool_rxnfc *cmd)
+{
+	cmd->data = 0;
+
+	switch (cmd->flow_type) {
+	case TCP_V4_FLOW:
+	case TCP_V6_FLOW:
+	case UDP_V4_FLOW:
+	case UDP_V6_FLOW:
+		cmd->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
+		/* Fall through */
+	case IPV4_FLOW:
+	case IPV6_FLOW:
+	case SCTP_V4_FLOW:
+	case SCTP_V6_FLOW:
+	case AH_ESP_V4_FLOW:
+	case AH_ESP_V6_FLOW:
+	case AH_V4_FLOW:
+	case AH_V6_FLOW:
+	case ESP_V4_FLOW:
+	case ESP_V6_FLOW:
+		cmd->data |= RXH_IP_SRC | RXH_IP_DST;
+		break;
+	default:
+		cmd->data = 0;
+		break;
+	}
+
+	return 0;
+}
+
+static int dpaa_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd,
+			  u32 *unused)
+{
+	int ret = -EOPNOTSUPP;
+
+	switch (cmd->cmd) {
+	case ETHTOOL_GRXFH:
+		ret = dpaa_get_hash_opts(dev, cmd);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static void dpaa_set_hash(struct net_device *net_dev, bool enable)
+{
+	struct mac_device *mac_dev;
+	struct fman_port *rxport;
+	struct dpaa_priv *priv;
+
+	priv = netdev_priv(net_dev);
+	mac_dev = priv->mac_dev;
+	rxport = mac_dev->port[0];
+
+	fman_port_use_kg_hash(rxport, enable);
+}
+
+static int dpaa_set_hash_opts(struct net_device *dev,
+			      struct ethtool_rxnfc *nfc)
+{
+	int ret = -EINVAL;
+
+	/* we support hashing on IPv4/v6 src/dest IP and L4 src/dest port */
+	if (nfc->data &
+	    ~(RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3))
+		return -EINVAL;
+
+	switch (nfc->flow_type) {
+	case TCP_V4_FLOW:
+	case TCP_V6_FLOW:
+	case UDP_V4_FLOW:
+	case UDP_V6_FLOW:
+	case IPV4_FLOW:
+	case IPV6_FLOW:
+	case SCTP_V4_FLOW:
+	case SCTP_V6_FLOW:
+	case AH_ESP_V4_FLOW:
+	case AH_ESP_V6_FLOW:
+	case AH_V4_FLOW:
+	case AH_V6_FLOW:
+	case ESP_V4_FLOW:
+	case ESP_V6_FLOW:
+		dpaa_set_hash(dev, !!nfc->data);
+		ret = 0;
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static int dpaa_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd)
+{
+	int ret = -EOPNOTSUPP;
+
+	switch (cmd->cmd) {
+	case ETHTOOL_SRXFH:
+		ret = dpaa_set_hash_opts(dev, cmd);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
 const struct ethtool_ops dpaa_ethtool_ops = {
 	.get_drvinfo = dpaa_get_drvinfo,
 	.get_msglevel = dpaa_get_msglevel,
@@ -412,4 +523,6 @@ const struct ethtool_ops dpaa_ethtool_ops = {
 	.get_strings = dpaa_get_strings,
 	.get_link_ksettings = dpaa_get_link_ksettings,
 	.set_link_ksettings = dpaa_set_link_ksettings,
+	.get_rxnfc = dpaa_get_rxnfc,
+	.set_rxnfc = dpaa_set_rxnfc,
 };