Re: [dpdk-users] Mellanox MLX5 Symmetric RSS

[Tom Barbette <barbette@kth.se>]

Hi,

The trick with symmetric RSS is simply to have a 2-bytes repeating key. 
Eg 6D5A repeated 20 times.

Tom

Le 28/04/2020 à 05:14, Bao-Long Tran a écrit :
> Hi,
> 
> We're testing the Mellanox NIC MT27800 Family [ConnectX-5] 1017. I wonder if the NIC support symmetric RSS and if yes how to configure it. The input traffic would be a pcap of one single eth/http/tcp flow with both directions., i.e,
> (A) 1.2.3.4:40 -> 5.6.7.8:80
> (B) 5.6.7.8:80 -> 1.2.3.4:40
> 
> The desired effect would be to have (A) and (B) hitting the same RX queue.
> 
> Below is what I have tried so far with testpmd. So (A) and (B) always hit different RX queues.
> 
> testpmd <EAL-options> -- -i -a --nb-cores=16 --forward-mode=rxonly --rxq=8 --txq=8
> 
> 1. flow create 0 ingress pattern eth type is 0x0800 / end actions rss / end
> 
> 2. low create 0 ingress pattern eth type is 0x0800 / end actions rss queues 0 1 2 3 4 5 6 7 end / end
> 
> 3. flow create 0 ingress pattern eth type is 0x0800 / end actions rss func toeplitz level 1 types ipv4 end queues 0 1 2 3 4 5 6 7 end / end
> 
> 4. flow create 0 ingress pattern eth type is 0x0800 / end actions rss func toeplitz level 1 types ipv4 end queues 0 1 2 3 4 5 6 7 end key 2CC681D15BDBF4F7FCA28319DB1A3E946B9E38D92C9C03D1AD9944A7D9563D59063C25F3FC1FDC2A key_len 40 / end
> 
> Thanks,
> BL
>