Rss hash on mellanox 100G card

[Yaron Illouz]

I am using Mellanox Technologies MT27800 Family [ConnectX-5], using dpdk 19 with multi rx queue with rss port_conf.rx_adv_conf.rss_conf.rss_hf=(ETH_RSS_IP | ETH_RSS_UDP | ETH_RSS_TCP)

I analyze traffic and need all packet of same session to arrive to the same process ( session for now can be ip+port)

So Packet that have the same ip + port arrive to the same queue.

But If some packet are ip fragmented, packet arrive to different process. It is a problem!

How can i calculate the hash value in the c++ code, like it is done in the card, so i can reassemble packets and send them to the same process like the non fragmented packets?


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