[dpdk-dev] [PATCH v4 2/2] net/iavf: support RSS for IPv6 prefix 64bit

[Junfeng Guo <junfeng.guo@intel.com>]

RSS for IPv6 prefix 64bit fields are supported in this patch, so that
we can use prefix instead of full IPv6 address for RSS. The prefix
here only includes the first 64 bits of both SRC and DST IPv6 address.

Signed-off-by: Junfeng Guo <junfeng.guo@intel.com>
---
 drivers/net/iavf/iavf_hash.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/net/iavf/iavf_hash.c b/drivers/net/iavf/iavf_hash.c
index d8a4dc8bf..61466c072 100644
--- a/drivers/net/iavf/iavf_hash.c
+++ b/drivers/net/iavf/iavf_hash.c
@@ -541,6 +541,11 @@ iavf_hash_parse_pattern(struct iavf_pattern_match_item *pattern_match_item,
 
 #define REFINE_PROTO_FLD(op, fld) \
 	VIRTCHNL_##op##_PROTO_HDR_FIELD(hdr, VIRTCHNL_PROTO_HDR_##fld)
+#define REPALCE_PROTO_FLD(fld_1, fld_2) \
+do { \
+	REFINE_PROTO_FLD(DEL, fld_1);	\
+	REFINE_PROTO_FLD(ADD, fld_2);	\
+} while (0)
 
 /* refine proto hdrs base on l2, l3, l4 rss type */
 static void
@@ -596,6 +601,14 @@ iavf_refine_proto_hdrs_l234(struct virtchnl_proto_hdrs *proto_hdrs,
 			} else {
 				hdr->field_selector = 0;
 			}
+			if (rss_type & RTE_ETH_RSS_L3_PRE64) {
+				if (REFINE_PROTO_FLD(TEST, IPV6_SRC))
+					REPALCE_PROTO_FLD(IPV6_SRC,
+							  IPV6_PREFIX64_SRC);
+				if (REFINE_PROTO_FLD(TEST, IPV6_DST))
+					REPALCE_PROTO_FLD(IPV6_DST,
+							  IPV6_PREFIX64_DST);
+			}
 			break;
 		case VIRTCHNL_PROTO_HDR_UDP:
 			if (rss_type &
@@ -764,6 +777,16 @@ iavf_any_invalid_rss_type(uint64_t rss_type, uint64_t allow_rss_type)
 			return true;
 	}
 
+	/* current ipv6 prefix only supports prefix 64 bits*/
+#define _invalid_prefix_ (RTE_ETH_RSS_L3_PRE32	| \
+			  RTE_ETH_RSS_L3_PRE40	| \
+			  RTE_ETH_RSS_L3_PRE48	| \
+			  RTE_ETH_RSS_L3_PRE56	| \
+			  RTE_ETH_RSS_L3_PRE96)
+
+	if (rss_type & _invalid_prefix_)
+		return true;
+
 	/* check not allowed RSS type */
 #define _RSS_ATTR_ (ETH_RSS_L3_SRC_ONLY		| \
 		    ETH_RSS_L3_DST_ONLY		| \
-- 
2.25.1