iavf: add RSS support for GTP protocol via ethtool

Extend the iavf driver to support Receive Side Scaling (RSS)
configuration for GTP (GPRS Tunneling Protocol) flows using ethtool.

The implementation introduces new RSS flow segment headers and hash field
definitions for various GTP encapsulations, including:

  - GTPC
  - GTPU (IP, Extension Header, Uplink, Downlink)
  - TEID-based hashing

The ethtool interface is updated to parse and apply these new flow types
and hash fields, enabling fine-grained traffic distribution for GTP-based
mobile workloads.

This enhancement improves performance and scalability for virtualized
network functions (VNFs) and user plane functions (UPFs) in 5G and LTE
deployments.

Reviewed-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index 05d72be3fe80..a3f8ced23266 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -1336,6 +1336,56 @@ static u32 iavf_adv_rss_parse_hdrs(const struct ethtool_rxfh_fields *cmd)
 		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_SCTP |
 			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6;
 		break;
+	case GTPU_V4_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPU_IP |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV4;
+		break;
+	case GTPC_V4_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPC |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_UDP |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV4;
+		break;
+	case GTPC_TEID_V4_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPC_TEID |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_UDP |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV4;
+		break;
+	case GTPU_EH_V4_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPU_EH |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV4;
+		break;
+	case GTPU_UL_V4_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPU_UP |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV4;
+		break;
+	case GTPU_DL_V4_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPU_DWN |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV4;
+		break;
+	case GTPU_V6_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPU_IP |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6;
+		break;
+	case GTPC_V6_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPC |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6;
+		break;
+	case GTPC_TEID_V6_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPC_TEID |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6;
+		break;
+	case GTPU_EH_V6_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPU_EH |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6;
+		break;
+	case GTPU_UL_V6_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPU_UP |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6;
+		break;
+	case GTPU_DL_V6_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_GTPU_DWN |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6;
+		break;
 	default:
 		break;
 	}
@@ -1353,6 +1403,12 @@ iavf_adv_rss_parse_hash_flds(const struct ethtool_rxfh_fields *cmd, bool symm)
 		case TCP_V4_FLOW:
 		case UDP_V4_FLOW:
 		case SCTP_V4_FLOW:
+		case GTPU_V4_FLOW:
+		case GTPC_V4_FLOW:
+		case GTPC_TEID_V4_FLOW:
+		case GTPU_EH_V4_FLOW:
+		case GTPU_UL_V4_FLOW:
+		case GTPU_DL_V4_FLOW:
 			if (cmd->data & RXH_IP_SRC)
 				hfld |= IAVF_ADV_RSS_HASH_FLD_IPV4_SA;
 			if (cmd->data & RXH_IP_DST)
@@ -1361,6 +1417,12 @@ iavf_adv_rss_parse_hash_flds(const struct ethtool_rxfh_fields *cmd, bool symm)
 		case TCP_V6_FLOW:
 		case UDP_V6_FLOW:
 		case SCTP_V6_FLOW:
+		case GTPU_V6_FLOW:
+		case GTPC_V6_FLOW:
+		case GTPC_TEID_V6_FLOW:
+		case GTPU_EH_V6_FLOW:
+		case GTPU_UL_V6_FLOW:
+		case GTPU_DL_V6_FLOW:
 			if (cmd->data & RXH_IP_SRC)
 				hfld |= IAVF_ADV_RSS_HASH_FLD_IPV6_SA;
 			if (cmd->data & RXH_IP_DST)
@@ -1382,6 +1444,7 @@ iavf_adv_rss_parse_hash_flds(const struct ethtool_rxfh_fields *cmd, bool symm)
 			break;
 		case UDP_V4_FLOW:
 		case UDP_V6_FLOW:
+		case GTPC_V4_FLOW:
 			if (cmd->data & RXH_L4_B_0_1)
 				hfld |= IAVF_ADV_RSS_HASH_FLD_UDP_SRC_PORT;
 			if (cmd->data & RXH_L4_B_2_3)
@@ -1398,6 +1461,32 @@ iavf_adv_rss_parse_hash_flds(const struct ethtool_rxfh_fields *cmd, bool symm)
 			break;
 		}
 	}
+	if (cmd->data & RXH_GTP_TEID) {
+		switch (cmd->flow_type) {
+		case GTPC_TEID_V4_FLOW:
+		case GTPC_TEID_V6_FLOW:
+			hfld |= IAVF_ADV_RSS_HASH_FLD_GTPC_TEID;
+			break;
+		case GTPU_V4_FLOW:
+		case GTPU_V6_FLOW:
+			hfld |= IAVF_ADV_RSS_HASH_FLD_GTPU_IP_TEID;
+			break;
+		case GTPU_EH_V4_FLOW:
+		case GTPU_EH_V6_FLOW:
+			hfld |= IAVF_ADV_RSS_HASH_FLD_GTPU_EH_TEID;
+			break;
+		case GTPU_UL_V4_FLOW:
+		case GTPU_UL_V6_FLOW:
+			hfld |= IAVF_ADV_RSS_HASH_FLD_GTPU_UP_TEID;
+			break;
+		case GTPU_DL_V4_FLOW:
+		case GTPU_DL_V6_FLOW:
+			hfld |= IAVF_ADV_RSS_HASH_FLD_GTPU_DWN_TEID;
+			break;
+		default:
+			break;
+		}
+	}
 
 	return hfld;
 }