From: Ajit Khaparde <ajit.khaparde@broadcom.com>
Sent: Tuesday, August 18, 2020 11:09 PM
To: Kiran Kumar Kokkilagadda <redacted>
Cc: Wenzhuo Lu <redacted>; Beilei Xing <redacted>; Bernard Iremonger <redacted>; Thomas Monjalon <redacted>; Ferruh Yigit <redacted>; Andrew Rybchenko <redacted>; dpdk-dev <redacted>; Jerin Jacob Kollanukkaran <redacted>; Ori Kam <redacted>; Ziyang Xuan <redacted>; Xiaoyun Wang <redacted>; Guoyang Zhou <redacted>; Rosen Xu <redacted>; jia.guo@intel.com; Rasesh Mody <rmody@marvell.com>; Shahed Shaikh <shshaikh@marvell.com>; Nithin Kumar Dabilpuram <redacted>; Qiming Yang <redacted>; Qi Zhang <redacted>; Wiles, Keith <redacted>; Hemant Agrawal <redacted>; Sachin Saxena <redacted>; Zhao1, Wei <redacted>; John Daley <redacted>; Hyong Youb Kim <redacted>; Chas Williams <redacted>; Matan Azrad <redacted>; Shahaf Shuler <redacted>; Viacheslav Ovsiienko <redacted>; Rahul Lakkireddy <redacted>; Gaetan Rivet <redacted>; Liron Himi <redacted>; Jingjing Wu <redacted>; Wei Hu (Xavier <redacted>; humin29@huawei.com; yisen.zhuang@huawei.com; Somnath Kotur <redacted>; Singh, Jasvinder <redacted>; Dumitrescu, Cristian <redacted>
Subject: [EXT] Re: [dpdk-dev][PATCH v3 1/2] ethdev: add level support for RSS offload types

External Email
________________________________


On Tue, Aug 18, 2020 at 12:22 AM <kirankumark@marvell.com<mailto:kirankumark@marvell.com>> wrote:
From: Kiran Kumar K <kirankumark@marvell.com<mailto:kirankumark@marvell.com>>

This patch reserves 2 bits as input selection to select Inner and
outer layers for RSS computation. It is combined with existing
ETH_RSS_* to choose Inner or outer layers for L2, L3 and L4.
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<mailto:kirankumark@marvell.com>>
---
V3 Changes:
* Added testpmd support.

 app/test-pmd/parameters.c      |  6 ++++++
 lib/librte_ethdev/rte_ethdev.h | 27 +++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index 7cb0e3d6e..5f669ff24 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c

@@ -632,6 +632,8 @@ launch_args_parse(int argc, char** argv)
                { "forward-mode",               1, 0, 0 },
                { "rss-ip",                     0, 0, 0 },
                { "rss-udp",                    0, 0, 0 },
+               { "rss-outer",                  0, 0, 0 },
+               { "rss-inner-outer",            0, 0, 0 },

If we don't specify any of these two, it is inner RSS?
Yes, that is correct.

If I configure rss-outer, how do I switch to inner RSS?
Will add support to config/reset using port config in the next version.

Thanks

                { "rxq",                        1, 0, 0 },
                { "txq",                        1, 0, 0 },
                { "rxd",                        1, 0, 0 },

@@ -1051,6 +1053,10 @@ launch_args_parse(int argc, char** argv)
                                rss_hf = ETH_RSS_IP;
                        if (!strcmp(lgopts[opt_idx].name, "rss-udp"))
                                rss_hf = ETH_RSS_UDP;
+                       if (!strcmp(lgopts[opt_idx].name, "rss-outer"))
+                               rss_hf |= ETH_RSS_LEVEL_OUTER;
+                       if (!strcmp(lgopts[opt_idx].name, "rss-inner-outer"))
+                               rss_hf |= ETH_RSS_LEVEL_INNER_OUTER;
                        if (!strcmp(lgopts[opt_idx].name, "rxq")) {
                                n = atoi(optarg);
                                if (n >= 0 && check_nb_rxq((queueid_t)n) == 0)

diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index d29930fd8..28184cc85 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.
+ * Note: Default is 0: inner layers, 1: outer layers, 2: both
+ * bit 50 and 51 are reserved for this.
+ */
+
+/**
+ * Level 0, It basically stands for the innermost encapsulation level RSS
+ * can be performed on according to PMD and device capabilities.
+ */
+#define ETH_RSS_LEVEL_INNER        (0ULL << 50)
+/**
+ * Level 1, It basically stands for the outermost encapsulation level RSS
+ * can be performed on according to PMD and device capabilities.
+ */
+#define ETH_RSS_LEVEL_OUTER        (1ULL << 50)
+/**
+ * Level 2, It basically stands for the both inner and outermost
+ * encapsulation level RSS can be performed on according to PMD and
+ * device capabilities.
+ */
+#define ETH_RSS_LEVEL_INNER_OUTER  (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