x710 VF use dpdk rte_flow_valida() return Function not implemented - virtualization

Question

OS:CentOS 7.3
DPDK:19.08
I use one X710 NIC, create 2 VFs in kernel driver i40e, and bind vfio-pci driver on VF 0 and Start a DPDK PMD application.
Then I try to create a Flow Rule use rte_flow, but it returns -38, Function not implemented when I called rte_flow_validate().
Does it means this VF doesn't support rte_flow API? or there are some configure or flags need to be set on VF?

Answer 1

DPDK RTE_FLOW are supported on both PF and VF for X710 (Fortville) NIC, with actions like
RTE_FLOW_ACTION_TYPE_QUEUE
RTE_FLOW_ACTION_TYPE_DROP
RTE_FLOW_ACTION_TYPE_PASSTHRU
RTE_FLOW_ACTION_TYPE_MARK
RTE_FLOW_ACTION_TYPE_RSS
The return value -38 for DPDK API is not Function not implemented, but actually I40E_ERR_OPCODE_MISMATCH. This means either Lookup parameters or match cases are improperly configured. Code Snippet that works on X710 VF, shared below
/* configure for 2 RX queues */
struct rte_flow_attr attr = { .ingress = 1 };
struct rte_flow_item pattern[10];
struct rte_flow_action actions[10];
struct rte_flow_item_eth eth;
struct rte_flow_item_eth eth_mask;
struct rte_flow_item_vlan vlan;
struct rte_flow_item_vlan vlan_mask;
struct rte_flow_item_ipv4 ipv4;
struct rte_flow_item_ipv4 ipv4_mask;
struct rte_flow *flow;
struct rte_flow_action_mark mark = { .id = 0xdeadbeef };
struct rte_flow_action_queue queue = { .index = 0x3 };
memset(&pattern, 0, sizeof(pattern));
memset(&actions, 0, sizeof(actions));
memset(&attr, 0, sizeof(attr));
attr.group = 0;
attr.priority = 0;
attr.ingress = 1;
attr.egress = 0;
memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
pattern[0].spec = ð
pattern[0].last = NULL;
pattern[0].mask = NULL;
memset(&vlan_mask, 0, sizeof(struct rte_flow_item_vlan));
pattern[1].type = RTE_FLOW_ITEM_TYPE_VLAN;
pattern[1].spec = &vlan;
pattern[1].last = NULL;
pattern[1].mask = NULL;
/* set the dst ipv4 packet to the required value */
pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
pattern[1].spec = NULL;
pattern[1].last = NULL;
pattern[1].mask = NULL;
pattern[2].type = RTE_FLOW_ITEM_TYPE_UDP;
pattern[2].spec = NULL;
pattern[2].last = NULL;
pattern[2].mask = NULL;
/* end the pattern array */
pattern[3].type = RTE_FLOW_ITEM_TYPE_END;
/* create the drop action */
actions[0].type = RTE_FLOW_ACTION_TYPE_MARK;
actions[0].conf = &mark;
actions[1].type = RTE_FLOW_ACTION_TYPE_END;
note: request #myzhu in comments to share the actual code snippet to root cause the issue too.