iavf: Support for modifying UDP RSS flow hashing

Provides the ability to enable UDP RSS hashing by ethtool.

It gives users option of generating RSS hash based on the UDP source
and destination ports numbers, IPv4 or IPv6 source and destination
addresses.
Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/iavf/iavf_adv_rss.c

@@ -56,6 +56,23 @@ iavf_fill_adv_rss_tcp_hdr(struct virtchnl_proto_hdr *hdr, u64 hash_flds)
 		VIRTCHNL_ADD_PROTO_HDR_FIELD_BIT(hdr, TCP, DST_PORT);
 }
 
+/**
+ * iavf_fill_adv_rss_udp_hdr - fill the UDP RSS protocol header
+ * @hdr: the virtchnl message protocol header data structure
+ * @hash_flds: the RSS configuration protocol hash fields
+ */
+static void
+iavf_fill_adv_rss_udp_hdr(struct virtchnl_proto_hdr *hdr, u64 hash_flds)
+{
+	VIRTCHNL_SET_PROTO_HDR_TYPE(hdr, UDP);
+
+	if (hash_flds & IAVF_ADV_RSS_HASH_FLD_UDP_SRC_PORT)
+		VIRTCHNL_ADD_PROTO_HDR_FIELD_BIT(hdr, UDP, SRC_PORT);
+
+	if (hash_flds & IAVF_ADV_RSS_HASH_FLD_UDP_DST_PORT)
+		VIRTCHNL_ADD_PROTO_HDR_FIELD_BIT(hdr, UDP, DST_PORT);
+}
+
 /**
  * iavf_fill_adv_rss_cfg_msg - fill the RSS configuration into virtchnl message
  * @rss_cfg: the virtchnl message to be filled with RSS configuration setting
@@ -92,6 +109,9 @@ iavf_fill_adv_rss_cfg_msg(struct virtchnl_rss_cfg *rss_cfg,
 	case IAVF_ADV_RSS_FLOW_SEG_HDR_TCP:
 		iavf_fill_adv_rss_tcp_hdr(hdr, hash_flds);
 		break;
+	case IAVF_ADV_RSS_FLOW_SEG_HDR_UDP:
+		iavf_fill_adv_rss_udp_hdr(hdr, hash_flds);
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -138,6 +158,8 @@ iavf_print_adv_rss_cfg(struct iavf_adapter *adapter, struct iavf_adv_rss *rss,
 
 	if (packet_hdrs & IAVF_ADV_RSS_FLOW_SEG_HDR_TCP)
 		proto = "TCP";
+	else if (packet_hdrs & IAVF_ADV_RSS_FLOW_SEG_HDR_UDP)
+		proto = "UDP";
 	else
 		return;
 
@@ -155,9 +177,11 @@ iavf_print_adv_rss_cfg(struct iavf_adapter *adapter, struct iavf_adv_rss *rss,
 	if (hash_flds & (IAVF_ADV_RSS_HASH_FLD_IPV4_DA |
 			 IAVF_ADV_RSS_HASH_FLD_IPV6_DA))
 		strcat(hash_opt, "IP DA,");
-	if (hash_flds & IAVF_ADV_RSS_HASH_FLD_TCP_SRC_PORT)
+	if (hash_flds & (IAVF_ADV_RSS_HASH_FLD_TCP_SRC_PORT |
+			 IAVF_ADV_RSS_HASH_FLD_UDP_SRC_PORT))
 		strcat(hash_opt, "src port,");
-	if (hash_flds & IAVF_ADV_RSS_HASH_FLD_TCP_DST_PORT)
+	if (hash_flds & (IAVF_ADV_RSS_HASH_FLD_TCP_DST_PORT |
+			 IAVF_ADV_RSS_HASH_FLD_UDP_DST_PORT))
 		strcat(hash_opt, "dst port,");
 
 	if (!action)

drivers/net/ethernet/intel/iavf/iavf_adv_rss.h

@@ -20,6 +20,7 @@ enum iavf_adv_rss_flow_seg_hdr {
 	IAVF_ADV_RSS_FLOW_SEG_HDR_IPV4	= 0x00000001,
 	IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6	= 0x00000002,
 	IAVF_ADV_RSS_FLOW_SEG_HDR_TCP	= 0x00000004,
+	IAVF_ADV_RSS_FLOW_SEG_HDR_UDP	= 0x00000008,
 };
 
 #define IAVF_ADV_RSS_FLOW_SEG_HDR_L3		\
@@ -27,7 +28,8 @@ enum iavf_adv_rss_flow_seg_hdr {
 	 IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6)
 
 #define IAVF_ADV_RSS_FLOW_SEG_HDR_L4		\
-	(IAVF_ADV_RSS_FLOW_SEG_HDR_TCP)
+	(IAVF_ADV_RSS_FLOW_SEG_HDR_TCP |	\
+	 IAVF_ADV_RSS_FLOW_SEG_HDR_UDP)
 
 enum iavf_adv_rss_flow_field {
 	/* L3 */
@@ -38,6 +40,8 @@ enum iavf_adv_rss_flow_field {
 	/* L4 */
 	IAVF_ADV_RSS_FLOW_FIELD_IDX_TCP_SRC_PORT,
 	IAVF_ADV_RSS_FLOW_FIELD_IDX_TCP_DST_PORT,
+	IAVF_ADV_RSS_FLOW_FIELD_IDX_UDP_SRC_PORT,
+	IAVF_ADV_RSS_FLOW_FIELD_IDX_UDP_DST_PORT,
 
 	/* The total number of enums must not exceed 64 */
 	IAVF_ADV_RSS_FLOW_FIELD_IDX_MAX
@@ -56,6 +60,10 @@ enum iavf_adv_rss_flow_field {
 	BIT_ULL(IAVF_ADV_RSS_FLOW_FIELD_IDX_TCP_SRC_PORT)
 #define IAVF_ADV_RSS_HASH_FLD_TCP_DST_PORT	\
 	BIT_ULL(IAVF_ADV_RSS_FLOW_FIELD_IDX_TCP_DST_PORT)
+#define IAVF_ADV_RSS_HASH_FLD_UDP_SRC_PORT	\
+	BIT_ULL(IAVF_ADV_RSS_FLOW_FIELD_IDX_UDP_SRC_PORT)
+#define IAVF_ADV_RSS_HASH_FLD_UDP_DST_PORT	\
+	BIT_ULL(IAVF_ADV_RSS_FLOW_FIELD_IDX_UDP_DST_PORT)
 
 /* bookkeeping of advanced RSS configuration */
 struct iavf_adv_rss {

drivers/net/ethernet/intel/iavf/iavf_ethtool.c

@@ -1434,10 +1434,18 @@ static u32 iavf_adv_rss_parse_hdrs(struct ethtool_rxnfc *cmd)
 		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_TCP |
 			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV4;
 		break;
+	case UDP_V4_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_UDP |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV4;
+		break;
 	case TCP_V6_FLOW:
 		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_TCP |
 			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6;
 		break;
+	case UDP_V6_FLOW:
+		hdrs |= IAVF_ADV_RSS_FLOW_SEG_HDR_UDP |
+			IAVF_ADV_RSS_FLOW_SEG_HDR_IPV6;
+		break;
 	default:
 		break;
 	}
@@ -1459,12 +1467,14 @@ static u64 iavf_adv_rss_parse_hash_flds(struct ethtool_rxnfc *cmd)
 	if (cmd->data & RXH_IP_SRC || cmd->data & RXH_IP_DST) {
 		switch (cmd->flow_type) {
 		case TCP_V4_FLOW:
+		case UDP_V4_FLOW:
 			if (cmd->data & RXH_IP_SRC)
 				hfld |= IAVF_ADV_RSS_HASH_FLD_IPV4_SA;
 			if (cmd->data & RXH_IP_DST)
 				hfld |= IAVF_ADV_RSS_HASH_FLD_IPV4_DA;
 			break;
 		case TCP_V6_FLOW:
+		case UDP_V6_FLOW:
 			if (cmd->data & RXH_IP_SRC)
 				hfld |= IAVF_ADV_RSS_HASH_FLD_IPV6_SA;
 			if (cmd->data & RXH_IP_DST)
@@ -1484,6 +1494,13 @@ static u64 iavf_adv_rss_parse_hash_flds(struct ethtool_rxnfc *cmd)
 			if (cmd->data & RXH_L4_B_2_3)
 				hfld |= IAVF_ADV_RSS_HASH_FLD_TCP_DST_PORT;
 			break;
+		case UDP_V4_FLOW:
+		case UDP_V6_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)
+				hfld |= IAVF_ADV_RSS_HASH_FLD_UDP_DST_PORT;
+			break;
 		default:
 			break;
 		}
@@ -1617,10 +1634,12 @@ iavf_get_adv_rss_hash_opt(struct iavf_adapter *adapter,
 			 IAVF_ADV_RSS_HASH_FLD_IPV6_DA))
 		cmd->data |= (u64)RXH_IP_DST;
 
-	if (hash_flds & IAVF_ADV_RSS_HASH_FLD_TCP_SRC_PORT)
+	if (hash_flds & (IAVF_ADV_RSS_HASH_FLD_TCP_SRC_PORT |
+			 IAVF_ADV_RSS_HASH_FLD_UDP_SRC_PORT))
 		cmd->data |= (u64)RXH_L4_B_0_1;
 
-	if (hash_flds & IAVF_ADV_RSS_HASH_FLD_TCP_DST_PORT)
+	if (hash_flds & (IAVF_ADV_RSS_HASH_FLD_TCP_DST_PORT |
+			 IAVF_ADV_RSS_HASH_FLD_UDP_DST_PORT))
 		cmd->data |= (u64)RXH_L4_B_2_3;
 
 	return 0;