[dpdk-dev] [PATCH v7 1/3] ethdev: add level support for RSS offload types

[<kirankumark@marvell.com>]

From: Kiran Kumar K <kirankumark@marvell.com>

This patch reserves 2 bits as input selection to select Inner and
outer encapsulation level for RSS computation. It is combined with existing
ETH_RSS_* to choose Inner or outer layers.
This functionality already exists in rte_flow through level parameter in
RSS action configuration rte_flow_action_rss.

Signed-off-by: Kiran Kumar K <kirankumark@marvell.com>
---
V7 Changes:
* Re-worked to keep it in sync with rte_flow_action_rss and support upto
3 levels.
* Addressed testpmd review comments.

 lib/librte_ethdev/rte_ethdev.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index 70295d7ab..13e49bbd7 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -552,6 +552,33 @@ struct rte_eth_rss_conf {
 #define RTE_ETH_RSS_L3_PRE64	   (1ULL << 53)
 #define RTE_ETH_RSS_L3_PRE96	   (1ULL << 52)

+/*
+ * We use the following macros to combine with the above layers to choose
+ * inner and outer layers or both for RSS computation.
+ * bit 50 and 51 are reserved for this.
+ */
+
+/** level 0, requests the default behavior. Depending on the packet
+ * type, it can mean outermost, innermost, anything in between or even no RSS.
+ * It basically stands for the innermost encapsulation level RSS
+ * can be performed on according to PMD and device capabilities.
+ */
+#define ETH_RSS_LEVEL_0         (0ULL << 50)
+
+/** level 1,  requests RSS to be performed on the outermost packet
+ * encapsulation level.
+ */
+#define ETH_RSS_LEVEL_1         (1ULL << 50)
+
+/** level 2,  requests RSS to be performed on the
+ * specified inner packet encapsulation level, from outermost to
+ * innermost (lower to higher values).
+ */
+#define ETH_RSS_LEVEL_2	        (2ULL << 50)
+#define ETH_RSS_LEVEL_MASK	(3ULL << 50)
+
+#define ETH_RSS_LEVEL(rss_hf) ((rss_hf & ETH_RSS_LEVEL_MASK) >> 50)
+
 /**
  * For input set change of hash filter, if SRC_ONLY and DST_ONLY of
  * the same level are used simultaneously, it is the same case as
--
2.25.1