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From: "Saleh, Omran" <omran.saleh@sap.com>
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Thread-Topic: Mellanox rss hash information
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Date: Wed, 28 Dec 2016 08:28:34 +0000
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Subject: [dpdk-users] Mellanox rss hash information
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Hi All,
Currently, I am using DPDK 16.11 with Mellanox NIC adapters (mlx5). I encou=
nter a problem that the RSS hash value from mbuf  (mbug.hash->rss) is not t=
he same as calculated from rte_softrss(). It is completely different.
I am using the default hash key from mlx5

uint8_t rss_hash_default_key[] =3D {
        0x2c, 0xc6, 0x81, 0xd1,
        0x5b, 0xdb, 0xf4, 0xf7,
        0xfc, 0xa2, 0x83, 0x19,
        0xdb, 0x1a, 0x3e, 0x94,
        0x6b, 0x9e, 0x38, 0xd9,
        0x2c, 0x9c, 0x03, 0xd1,
        0xad, 0x99, 0x44, 0xa7,
        0xd9, 0x56, 0x3d, 0x59,
        0x06, 0x3c, 0x25, 0xf3,
        0xfc, 0x1f, 0xdc, 0x2a,
};
And the following call:
auto hash =3D rte_softrss(&tuple.v4.src_addr, RTE_THASH_V4_L4_LEN, rss_hash=
_default_key);
with RSS configurations as the following:

port_conf.rxmode.mq_mode =3D ETH_MQ_RX_RSS;
port_conf.rx_adv_conf.rss_conf.rss_hf =3D ETH_RSS_NONFRAG_IPV4_TCP;
port_conf.rx_adv_conf.rss_conf.rss_key=3D rss_hash_default_key;
port_conf.rx_adv_conf.rss_conf.rss_key_len =3D 40;

This is working perfectly with ixgbe  but Mellanox not. Can you help me to =
figure out what is the problem? What is the default Toeplitz function for m=
lx5?!

My NIC adapters are  Mellanox Technologies MT27700 Family [ConnectX-4]
With firmware version 12.16.1006 and ofed version  3.3-2.0.0

uname -a : Linux ibmhanar16 3.12.49-11-default #1 SMP Wed Nov 11 20:52:43 U=
TC 2015 (8d714a0) x86_64 x86_64 x86_64 GNU/Linux

Thank you
Best regards,
Omran Saleh