[dpdk-dev] Symmetric RSS Hashing in DPDK
Kamraan Nasim
knasim at sidebandnetworks.com
Tue Dec 16 20:52:20 CET 2014
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
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