[PATCH v3 1/1] usertools/rss: add CNXK RSS key

[<skori@marvell.com>]

From: Sunil Kumar Kori <skori@marvell.com>

This patch adds RSS key for CNXK platforms. CNXK platform uses
48 bytes long key for hash calculations.

For the same patch also updates help mesaages to provide range
information for supporting NICs/platforms.

Also CNXK uses reta size as 64 so to get correct offset to retrieve
queue index, user must pass reta_size option as 64 i.e. -t 64.

Examples:
$ ./dpdk-rss-flows.py -k cnxk 8 28.0.0.0/24 40.0.0.0/24 -t 64
SRC_IP      DST_IP       QUEUE
28.0.0.1    40.0.0.1     7
28.0.0.1    40.0.0.2     2
28.0.0.1    40.0.0.3     4
28.0.0.1    40.0.0.7     1
28.0.0.1    40.0.0.8     3
28.0.0.1    40.0.0.9     5
28.0.0.1    40.0.0.10    0
28.0.0.1    40.0.0.11    6

Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
---
v2..v3:
 - Fix key size range check.
 - Fix default key size file name.

v1..v2:
 - Fix checkpatch errors.

 usertools/dpdk-rss-flows.py | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/usertools/dpdk-rss-flows.py b/usertools/dpdk-rss-flows.py
index 73821eb471..937f9e1927 100755
--- a/usertools/dpdk-rss-flows.py
+++ b/usertools/dpdk-rss-flows.py
@@ -188,11 +188,24 @@ def balanced_traffic(
         0x81, 0x15, 0x03, 0x66,
     )
 )
+# default_key, see drivers/common/cnxk/roc_nix_rss.c
+# Marvell's cnxk NICs take 48 bytes keys
+RSS_KEY_CNXK = bytes(
+    (
+        0xfe, 0xed, 0x0b, 0xad, 0xfe, 0xed, 0x0b, 0xad,
+        0xfe, 0xed, 0x0b, 0xad, 0xfe, 0xed, 0x0b, 0xad,
+        0xfe, 0xed, 0x0b, 0xad, 0xfe, 0xed, 0x0b, 0xad,
+        0xfe, 0xed, 0x0b, 0xad, 0xfe, 0xed, 0x0b, 0xad,
+        0xfe, 0xed, 0x0b, 0xad, 0xfe, 0xed, 0x0b, 0xad,
+        0xfe, 0xed, 0x0b, 0xad, 0xfe, 0xed, 0x0b, 0xad,
+    )
+)
 # fmt: on
 DEFAULT_DRIVER_KEYS = {
     "intel": RSS_KEY_INTEL,
     "mlx": RSS_KEY_MLX,
     "i40e": RSS_KEY_I40E,
+    "cnxk": RSS_KEY_CNXK,
 }
 
 
@@ -201,8 +214,8 @@ def rss_key(value):
         return DEFAULT_DRIVER_KEYS[value]
     try:
         key = binascii.unhexlify(value)
-        if len(key) not in (40, 52):
-            raise argparse.ArgumentTypeError("The key must be 40 or 52 bytes long")
+        if len(key) not in range(40, 52):
+            raise argparse.ArgumentTypeError("The key must be 40 to 52 bytes long")
         return key
     except (TypeError, ValueError) as e:
         raise argparse.ArgumentTypeError(str(e)) from e
@@ -299,7 +312,7 @@ def parse_args():
         default=RSS_KEY_INTEL,
         type=rss_key,
         help="""
-        The random 40-bytes key used to compute the RSS hash. This option
+        The random 40 to 52 bytes key used to compute the RSS hash. This option
         supports either a well-known name or the hex value of the key
         (well-known names: "intel", "mlx", default: "intel").
         """,
-- 
2.25.1