Hello

 

I am encountering an issue where the RSS value for some packets is set to 0 when I try to calculate it. Here’s my code for configuring RSS:

 

static constexpr auto kRssHashKeyLen = 40U;

 

static std::array<uint8_t, kRssHashKeyLen> kSymmetricHashKey = {

    0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A,

    0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A,

    0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A, 0x6D, 0x5A};

rte_eth_conf port_conf{};

 

rte_eth_rxmode rx_mode{};

 

rx_mode.mq_mode = RTE_ETH_MQ_RX_RSS;

rx_mode.offloads = RTE_ETH_RX_OFFLOAD_RSS_HASH;

port_conf.rxmode = rx_mode;

port_conf.rx_adv_conf.rss_conf.rss_key = kSymmetricHashKey.data();

port_conf.rx_adv_conf.rss_conf.rss_key_len = kRssHashKeyLen;

port_conf.rx_adv_conf.rss_conf.rss_hf = RTE_ETH_RSS_IP | RTE_ETH_RSS_UDP | RTE_ETH_RSS_TCP;

 

Setting rx_vec_en=0 on the device helped resolve this problem. However, a new issue has emerged—packets belonging to the same connection sometimes yield different RSS values at the output.

 

Could you please advise how to address this problem?

 

DPDK version: 23.11

 

Regards,

Zaytsev Leonid