[dpdk-dev] [PATCH v7 2/3] ethdev: extend RSS offload types

[Simei Su <simei.su@intel.com>]

This patch reserves several bits as input set selection from the
high end of the 64 bits. It is combined with exisiting ETH_RSS_*
to represent rss types.

for example:
  ETH_RSS_IPV4 | ETH_RSS_L3_SRC_ONLY: hash on src ip address only
  ETH_RSS_IPV4_UDP | ETH_RSS_L4_DST_ONLY: hash on src/dst IP and
                                          dst UDP port

Signed-off-by: Simei Su <simei.su@intel.com>
---
 lib/librte_ethdev/rte_ethdev.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index 7722f70..e68bca8 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -505,6 +505,19 @@ struct rte_eth_rss_conf {
 #define ETH_RSS_GENEVE             (1ULL << 20)
 #define ETH_RSS_NVGRE              (1ULL << 21)
 
+/*
+ * We use the following macros to combine with above ETH_RSS_* for
+ * more specific input set selection. These bits are defined starting
+ * from the high end of the 64 bits.
+ * Note: If we use above ETH_RSS_* without SRC/DST_ONLY, it represents
+ * both SRC and DST are taken into account. SRC_ONLY and DST_ONLY of
+ * the same level can't be used simultaneously.
+ */
+#define ETH_RSS_L3_SRC_ONLY        (1ULL << 63)
+#define ETH_RSS_L3_DST_ONLY        (1ULL << 62)
+#define ETH_RSS_L4_SRC_ONLY        (1ULL << 61)
+#define ETH_RSS_L4_DST_ONLY        (1ULL << 60)
+
 #define ETH_RSS_IP ( \
 	ETH_RSS_IPV4 | \
 	ETH_RSS_FRAG_IPV4 | \
-- 
1.8.3.1