+ /**
+ * initialise structure to send to user application
+ * will return response from user in retval field
+ */
+ cb_param.retval = RTE_PMD_I40E_MB_EVENT_PROCEED;
+ cb_param.vfid = vf_id;
+ cb_param.msg_type = opcode;
+ cb_param.msg = (void *)msg;
+ cb_param.msglen = msglen;
+
+ /**
+ * Ask user application if we're allowed to perform those functions.
+ * If we get cb_param.retval == RTE_PMD_I40E_MB_EVENT_PROCEED,
+ * then business as usual.
+ * If RTE_PMD_I40E_MB_EVENT_NOOP_ACK or RTE_PMD_I40E_MB_EVENT_NOOP_NACK,
+ * do nothing and send not_supported to VF. As PF must send a response
+ * to VF and ACK/NACK is not defined.
+ */
+ _rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_VF_MBOX, &cb_param);
+ if (cb_param.retval != RTE_PMD_I40E_MB_EVENT_PROCEED) {
+ PMD_DRV_LOG(WARNING, "VF to PF message(%d) is not permitted!",
+ opcode);
+ b_op = FALSE;
+ }
+