Hi SidAli,


if that is the only rule you are creating then I don't think it is 
enough. Please have a look at this snippet I made few years back.

https://gist.github.com/lukashino/8fe387caabe2750d396bc97f2d66066a


There you first initialize the number of queues and then in the 
follow-up rules the patterns you want to apply RSS to.


Cheers,

Lukas

On 3/25/25 17:42, Sid ali cherrati wrote:
> Dear DPDK Team,
>
> I hope this message finds you well. I am reaching out to seek your 
> expertise regarding an issue I am encountering while configuring *DPDK 
> flow rules with RSS* on an *Intel X710 NIC* (using the |i40e| driver). 
> Despite multiple attempts, I have been unable to resolve the error and 
> would greatly appreciate your guidance.
>
> *Objective* :
> Redirect UDP traffic (specific destination IP/port) to *multiple RX 
> queues* using |rte_flow| with RSS.
>
> *Error : *
> Validation failed: RSS Queues not supported when pattern specified .
>
> *Hardware/Software*:
>
>  *
>
>     NIC: Intel X710
>
>   * Driver: |i40e|
>  *
>
>     DPDK Version: 23.11
>
> *Code Snippet:*
> intflow_filtering(uint16_tport_id, uint32_tip_addr, uint16_tudp_port) {
> structrte_flow_errorerror;
> structrte_flow_attrattr={ .ingress=1, .priority=0};
> structrte_flow_itempattern[4];
> structrte_flow_actionaction[2];
> structrte_flow*flow;
> // Ethernet
> memset(pattern, 0, sizeof(pattern));
> pattern[0].type=RTE_FLOW_ITEM_TYPE_ETH;
> // IPv4
> structrte_flow_item_ipv4ipv4_spec={ .hdr.dst_addr=RTE_BE32(ip_addr) };
> structrte_flow_item_ipv4ipv4_mask={ .hdr.dst_addr=RTE_BE32(0xFFFFFFFF) };
> pattern[1].type=RTE_FLOW_ITEM_TYPE_IPV4;
> pattern[1].spec=&ipv4_spec;
> pattern[1].mask=&ipv4_mask;
> // UDP
> structrte_flow_item_udpudp_spec={ .hdr.dst_port=RTE_BE16(udp_port) };
> structrte_flow_item_udpudp_mask={ .hdr.dst_port=RTE_BE16(0xFFFF) };
> pattern[2].type=RTE_FLOW_ITEM_TYPE_UDP;
> pattern[2].spec=&udp_spec;
> pattern[2].mask=&udp_mask;
> pattern[3].type=RTE_FLOW_ITEM_TYPE_END;
> // action
> action[0].type=RTE_FLOW_ACTION_TYPE_RSS;
> // struct rte_flow_action_queue queue_action = { .index = RX_ID };
> // action[0].conf = &queue_action;
> // Configuration RSS
> uint16_tqueues[]={1, 2, 3};
> structrte_flow_action_rssrss_conf={
> .func=RTE_ETH_HASH_FUNCTION_DEFAULT,
> .types=
> RTE_ETH_RSS_IPV4|
> RTE_ETH_RSS_UDP,
> .key_len=0,
> .queue_num=3,
> .queue=queues,
> };
> action[0].type=RTE_FLOW_ACTION_TYPE_RSS;
> action[0].conf=&rss_conf;
> action[1].type=RTE_FLOW_ACTION_TYPE_END;
> if(rte_flow_validate(port_id, &attr, pattern, action, &error) !=0) {
> printf("Validation Failure: %s\n", error.message);
> return-1;
> }
> // Flow rule creation
> flow=rte_flow_create(port_id, &attr, pattern, action, &error);
> if(flow==NULL) {
> printf("Error creating flow rule : %s\n", error.message);
> return-1;
> }
> printf("Flow rule created for IP %u.%u.%u.%uand UDP port %u\n",
> (ip_addr>>24) &0xFF, (ip_addr>>16) &0xFF,
> (ip_addr>>8) &0xFF, ip_addr&0xFF, udp_port);
> return0;
> }
>
> I would be grateful for any insights, code examples, or documentation 
> references to resolve this issue. Please let me know if additional 
> details are required.
>
> Thank you in advance for your time and support.
>
> Best regards,
>
> SidAli
>
>