Hi, When I create bond4 with ConnectX-4 , mlx_flow_create return error; When bond_port is opened, slave_port  will be closed to sync bond_port config  (bond_ethdev_start -> slave_configure->rte_eth_dev_stop) ​slave_configure(struct rte_eth_dev *bonded_eth_dev, struct rte_eth_dev *slave_eth_dev) { uint16_t nb_rx_queues; uint16_t nb_tx_queues; int errval; struct bond_dev_private *internals = bonded_eth_dev->data->dev_private; /* Stop slave */ errval = rte_eth_dev_stop(slave_eth_dev->data->port_id); if (errval != 0) RTE_BOND_LOG(ERR, "rte_eth_dev_stop: port %u, err (%d)", slave_eth_dev->data->port_id, errval); However,  If the device is not started yetm it is not allowed to created a flow from application. (slave_configure -> bond_ethdev_8023ad_flow_set -> rte_flow_create -> mlx5_flow_create) I  want to add rte_eth_dev_start before bond_ethdev_8023ad_flow_set. This can solve my problem. compile_success 980965867@qq.com