MGMT_MSG_RSVD_FOR_DEV
memset(mgmt_cmd, 0, MGMT_MSG_RSVD_FOR_DEV);
mgmt_cmd += MGMT_MSG_RSVD_FOR_DEV;
u16 msg_len = MGMT_MSG_RSVD_FOR_DEV + sizeof(u64) + msg_data_len;