[dpdk-users] DPDK-20.08/i40e driver/XXV710 NIC: Error while adding a flexible payload rule

["Joshi, Venkatesh" <venkatesh.joshi@hpe.com>]

Hi,

I am running DPDK 20.08 version. The NIC is XXV710 with i40e driver. 

I'm trying to program a flexible payload rule but it is returning an error message as follows:
---
Error in creation of UDPv4 Rule for XYZ port. Error type: 13
Message: Conflict with the first flexible rule.
EAL: Error - exiting with code: 1
---

Is this a known issue with the i40e driver?

I am able to create rules that match the port attributes in the L4 header.
However, I need to do the following:

    Assume a packet with the following format:
    L2 Hdr + L3 Hdr + L4 Hder + (payload)
     - match for certain pattern in bytes 16 to 19 of the payload.
     - I'm trying to use flexible payload to match the bytes 16 to 19 of the payload.


The code is as follows:
----

    struct rte_flow_attr  attr;
    struct rte_flow_item  pattern[MAX_PATTERN_NUM]; //5 
    struct rte_flow_action  action[MAX_ACTION_NUM];
    struct rte_flow  *flow = NULL;
    struct rte_flow_error  error;
    struct rte_flow_action_queue  queue;
    struct rte_flow_item  eth_item = { RTE_FLOW_ITEM_TYPE_ETH, 0, 0, 0 };
    struct rte_flow_item  ipv4_item = { RTE_FLOW_ITEM_TYPE_IPV4, 0, 0, 0 };
    struct rte_flow_item  ipv6_item = { RTE_FLOW_ITEM_TYPE_IPV6, 0, 0, 0 };
    struct rte_flow_item  end_item = { RTE_FLOW_ITEM_TYPE_END, 0, 0, 0 };
    struct rte_flow_item_udp  udp_spec;
    struct rte_flow_item_udp  udp_mask;
    struct rte_flow_item_raw raw_spec;
    struct rte_flow_item_raw raw_mask;
    uint8_t raw_pat_data[] = { 0x21, 0x32, 0x21, 0x32 };
    uint8_t raw_pat_mask[] = { 0xff, 0xff, 0xff, 0xff };
    uint16_t udp_rx_q = 4;
    uint8_t nr;
    int res;

    memset(pattern, 0, sizeof(pattern));
    memset(action, 0, sizeof(action));

    /*
     * set the rule attribute.
     * in this case only ingress packets will be checked.
     */
    memset(&attr, 0, sizeof(struct rte_flow_attr));
    attr.ingress = 1;

    /*
     * create the action sequence.
     * one action only,  move packet to queue
     */
    queue.index = udp_rx_q;
    action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
    action[0].conf = &queue;
    action[1].type = RTE_FLOW_ACTION_TYPE_END;

    /*
     * L2: set the first level of the pattern
     */
    pattern[0] = eth_item;

    /*
     * L3: set the second level here - IPV4
     */
    pattern[1] = ipv4_item;

    /*
     * L4: set the third level of the pattern - UDP
     */
    memset(&udp_spec, 0, sizeof(struct rte_flow_item_udp));
    memset(&udp_mask, 0, sizeof(struct rte_flow_item_udp));
    udp_spec.hdr.dst_port = FRAME_UDP_PORT_XYZ;
    udp_mask.hdr.dst_port = L4_PORT_MASK;
    udp_spec.hdr.src_port = FRAME_UDP_PORT_XYZ;
    udp_mask.hdr.src_port = L4_PORT_MASK;

    pattern[2].type = RTE_FLOW_ITEM_TYPE_UDP;
    pattern[2].spec = &udp_spec;
    pattern[2].mask = &udp_mask;

    /* L5: raw: set the pattern */
    memset(&raw_spec, 0, sizeof(struct rte_flow_item_raw));
    memset(&raw_mask, 0, sizeof(struct rte_flow_item_raw));
    raw_spec.relative = 1;
    raw_spec.offset = 16;
    raw_spec.length = sizeof(raw_pat_data);
    raw_spec.pattern = raw_pat_data;

    raw_mask.offset = -1;
    raw_mask.length = -1;
    raw_mask.pattern = raw_pat_mask;

    pattern[3].type = RTE_FLOW_ITEM_TYPE_RAW;
    pattern[3].spec = &raw_spec;
    pattern[3].mask = &raw_mask;

    /* the final level must be always type end */
    pattern[4] = end_item;

    flow = rte_flow_create(port_id, &attr, pattern, action, &error);
    if (!flow) {
        snprintf(errmsgbuf, sizeof(errmsgbuf), "Error in creation of UDPv4 Rule for XYZ port");
        sos_dpdk_fdir_flow_complain(errmsgbuf, &error);
        rte_exit(EXIT_FAILURE, "Error in creating flow");
    }
----------

Any pointers will be most appreciated.


Regards,
Venkatesh