Hello, My DPDK application requires bidirectional TCP flows to have the same RSS hash however default RSS hashing is *asymmetric*.
There are posts such as: http://dpdk.info/ml/archives/dev/2014-February/001460.html which point to a symmetric RSS key(0x6d5a). I have tried using it but it is still hashing bi-directional flows separately. I am using an 82599 NIC. Have others come across this? What other options are available(I presume S/W hashing)? Appreciate any help I can get on this :) #define RSS_HASH_KEY_LENGTH 40 static uint8_t hash_key[RSS_HASH_KEY_LENGTH] = { 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, }; // ethernet rx config static struct rte_eth_conf port_conf = { .rxmode = { .mq_mode = ETH_MQ_RX_RSS, .split_hdr_size = 0, .header_split = 0, /**< Header Split disabled */ .hw_ip_checksum = 1, /**< IP checksum offload enabled */ .hw_vlan_filter = 0, /**< VLAN filtering disabled */ .jumbo_frame = 0, /**< Jumbo Frame Support disabled */ .hw_strip_crc = 0, /**< CRC stripped by hardware */ }, .rx_adv_conf = { .rss_conf = { .rss_key = hash_key, .rss_hf = ETH_RSS_PROTO_MASK, }, }, .txmode = { .mq_mode = ETH_MQ_TX_NONE, }, }; Thanks, Kam
