Fix flow rules failing after verification on PF

DPDK backend flow rules are failing on the E810 PF
when ETH rules are ignored on the default
attribute group 0.

Retry applying the flow rules on the queue with
group 2 if applying to group 0 fails but passes
verification.

lib/src/mt_flow.c

@@ -178,6 +178,17 @@ static struct rte_flow* rte_rx_flow_create(struct mt_interface* inf, uint16_t q,
   mt_pthread_mutex_lock(&inf->vf_cmd_mutex);
   r_flow = rte_flow_create(port_id, &attr, pattern, action, &error);
   mt_pthread_mutex_unlock(&inf->vf_cmd_mutex);
+
+  /* WA for PF interfaces */
+  if (!has_ip_flow && !r_flow) {
+    info("%s(%d), Flow creation failed on default group, retrying with group 2\n",
+         __func__, port);
+    mt_pthread_mutex_lock(&inf->vf_cmd_mutex);
+    attr.group = 2;
+    r_flow = rte_flow_create(port_id, &attr, pattern, action, &error);
+    mt_pthread_mutex_unlock(&inf->vf_cmd_mutex);
+  }
+
   if (!r_flow) {
     err("%s(%d), rte_flow_create fail for queue %d, %s\n", __func__, port, q,
         mt_string_safe(error.message));