enic: set UDP rss flag

New hardware needs UDP flag set to enable UDP L4 rss hash. Add ethtool
get option to display supported rss flow hash.

Signed-off-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cisco/enic/enic_ethtool.c

@@ -474,6 +474,39 @@ static int enic_grxclsrule(struct enic *enic, struct ethtool_rxnfc *cmd)
 	return 0;
 }
 
+static int enic_get_rx_flow_hash(struct enic *enic, struct ethtool_rxnfc *cmd)
+{
+	cmd->data = 0;
+
+	switch (cmd->flow_type) {
+	case TCP_V6_FLOW:
+	case TCP_V4_FLOW:
+		cmd->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
+		/* Fall through */
+	case UDP_V6_FLOW:
+	case UDP_V4_FLOW:
+		if (vnic_dev_capable_udp_rss(enic->vdev))
+			cmd->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
+		/* Fall through */
+	case SCTP_V4_FLOW:
+	case AH_ESP_V4_FLOW:
+	case AH_V4_FLOW:
+	case ESP_V4_FLOW:
+	case SCTP_V6_FLOW:
+	case AH_ESP_V6_FLOW:
+	case AH_V6_FLOW:
+	case ESP_V6_FLOW:
+	case IPV4_FLOW:
+	case IPV6_FLOW:
+		cmd->data |= RXH_IP_SRC | RXH_IP_DST;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int enic_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd,
 			  u32 *rule_locs)
 {
@@ -500,6 +533,9 @@ static int enic_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd,
 		ret = enic_grxclsrule(enic, cmd);
 		spin_unlock_bh(&enic->rfs_h.lock);
 		break;
+	case ETHTOOL_GRXFH:
+		ret = enic_get_rx_flow_hash(enic, cmd);
+		break;
 	default:
 		ret = -EOPNOTSUPP;
 		break;

drivers/net/ethernet/cisco/enic/enic_main.c

@@ -2316,7 +2316,7 @@ static int enic_set_rss_nic_cfg(struct enic *enic)
 {
 	struct device *dev = enic_get_dev(enic);
 	const u8 rss_default_cpu = 0;
-	const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
+	u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
 		NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
 		NIC_CFG_RSS_HASH_TYPE_IPV6 |
 		NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
@@ -2324,6 +2324,8 @@ static int enic_set_rss_nic_cfg(struct enic *enic)
 	const u8 rss_base_cpu = 0;
 	u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
 
+	if (vnic_dev_capable_udp_rss(enic->vdev))
+		rss_hash_type |= NIC_CFG_RSS_HASH_TYPE_UDP;
 	if (rss_enable) {
 		if (!enic_set_rsskey(enic)) {
 			if (enic_set_rsscpu(enic, rss_hash_bits)) {

drivers/net/ethernet/cisco/enic/vnic_dev.c

@@ -1281,3 +1281,20 @@ int vnic_dev_get_supported_feature_ver(struct vnic_dev *vdev, u8 feature,
 
 	return ret;
 }
+
+bool vnic_dev_capable_udp_rss(struct vnic_dev *vdev)
+{
+	u64 a0 = CMD_NIC_CFG, a1 = 0;
+	u64 rss_hash_type;
+	int wait = 1000;
+	int err;
+
+	err = vnic_dev_cmd(vdev, CMD_CAPABILITY, &a0, &a1, wait);
+	if (err || !a0)
+		return 0;
+
+	rss_hash_type = (a1 >> NIC_CFG_RSS_HASH_TYPE_SHIFT) &
+			NIC_CFG_RSS_HASH_TYPE_MASK_FIELD;
+
+	return (rss_hash_type & NIC_CFG_RSS_HASH_TYPE_UDP);
+}

drivers/net/ethernet/cisco/enic/vnic_dev.h

@@ -184,5 +184,6 @@ int vnic_dev_overlay_offload_cfg(struct vnic_dev *vdev, u8 overlay,
 				 u16 vxlan_udp_port_number);
 int vnic_dev_get_supported_feature_ver(struct vnic_dev *vdev, u8 feature,
 				       u64 *supported_versions, u64 *a1);
+bool vnic_dev_capable_udp_rss(struct vnic_dev *vdev);
 
 #endif /* _VNIC_DEV_H_ */

drivers/net/ethernet/cisco/enic/vnic_nic.h

@@ -47,6 +47,7 @@
 #define NIC_CFG_RSS_HASH_TYPE_TCP_IPV6		(1 << 4)
 #define NIC_CFG_RSS_HASH_TYPE_IPV6_EX		(1 << 5)
 #define NIC_CFG_RSS_HASH_TYPE_TCP_IPV6_EX	(1 << 6)
+#define NIC_CFG_RSS_HASH_TYPE_UDP		(1 << 7)
 
 static inline void vnic_set_nic_cfg(u32 *nic_cfg,
 	u8 rss_default_cpu, u8 rss_hash_type,