Hi Ori

Thank you for your answer it helped me

But I can see the load balancing is not done to the same instance for both directions
I would like to have ip + port pairs arrive to same instance

Now ip1+port1 -> ip2+port2 arrive to instance x and ip2+port2 -> ip1+port1 arrive to another instance

How can I solve this?

From: Ori Kam <orika@nvidia.com>
Sent: Wednesday, February 14, 2024 6:07 PM
To: Yaron Illouz <yaroni@radcom.com>; dev@dpdk.org; 'users@dpdk.org' <users@dpdk.org>
Subject: RE: rss calculation as the nic

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Hi Yaron,

I can see some possible issues with your code, please see below.

From: Yaron Illouz <yaroni@radcom.com>
Sent: Saturday, February 3, 2024 7:03 PM
To: dev@dpdk.org; 'users@dpdk.org' <users@dpdk.org>
Subject: rss calculation as the nic

[Snip]

static inline uint32_t

do_softrss(struct rte_mbuf *m)

{

    uint32_t input_len;

    struct rte_ipv4_tuple ipv4_tuple;

    char * pRawPacket = static_cast<char*>(rte_pktmbuf_mtod(pi_mbuf, void* ));

    IpHeader * pIpHeader = (IpHeader *)(pRawPacket + offsetOfIp);

    if(pIpHeader->GetVersion()==4)

    {

        ipv4_tuple.src_addr = rte_be_to_cpu_32(pIpHeader->dwSrcAddressBigEndian);

        ipv4_tuple.dst_addr = rte_be_to_cpu_32(pIpHeader->dwDstAddressBigEndian);

[Ori] here you are converting BE to CPU

        ipv4_tuple.sport = *(uint16_t*)(pRawPacket + transportLayerOffset);

        ipv4_tuple.dport = *(uint16_t*)(pRawPacket + transportLayerOffset+2);

[Ori] here you keep the values as BE

        input_len = RTE_THASH_V4_L3_LEN;

        return rte_softrss_be((uint32_t *)&ipv4_tuple, input_len, rss_key_be);

[Ori] the above function expects to get everything in BE and  you should also call rte_convert_rss_key before the use of the above function.

    }

    return 0;

}

new_rss = do_softrss(mbuf_pointer);

std::cout<< std::hex << mbuf_pointer->hash.rss << " -> " << new_rss << std::dec << std::endl;

And i get a different value than the mbuf_pointer->hash.rss

5ed28a5c -> 33eb33eb

974c1896 -> 24e224e2

1edf1638 -> 21752175

8a54c19 -> 80638063

459a6f76 -> 1b351b35

1cdf1d1c -> e53be53b

****  I understand it is possible to do it, but i don't get the same value  ***

ethtool -i ens5f0

driver: mlx5_core

version: 5.8-3.0.7

firmware-version: 22.32.2004 (MT_0000000437)

expansion-rom-version:

bus-info: 0000:83:00.0

supports-statistics: yes

supports-test: yes

supports-eeprom-access: no

supports-register-dump: no

supports-priv-flags: yes