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//
// Copyright 2010-2013 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef INCLUDED_UHD_TRANSPORT_USB_ZERO_COPY_HPP
#define INCLUDED_UHD_TRANSPORT_USB_ZERO_COPY_HPP
#include <uhd/transport/usb_device_handle.hpp>
#include <uhd/transport/zero_copy.hpp>
#include <uhd/types/device_addr.hpp>
namespace uhd { namespace transport {
/*!
* A zero copy USB transport provides an efficient way to handle data.
* by avoiding the extra copy when recv() or send() is called on the handle.
* Rather, the zero copy transport gives the caller memory references.
* The caller informs the transport when it is finished with the reference.
*
* On Linux systems, the zero copy transport can use a kernel packet ring.
* If no platform specific solution is available, make returns a boost asio
* implementation that wraps functionality around standard send/recv calls.
*/
class UHD_API usb_zero_copy : public virtual zero_copy_if {
public:
typedef boost::shared_ptr<usb_zero_copy> sptr;
virtual ~usb_zero_copy(void);
/*!
* Make a new zero copy USB transport:
* This transport is for sending and receiving between the host
* and a pair of USB bulk transfer endpoints.
* The primary usage for this transport is data transactions.
* The underlying implementation may be platform specific.
*
* \param handle a device handle that uniquely identifying the device
* \param recv_interface an integer specifying an IN interface number
* \param recv_endpoint an integer specifying an IN endpoint number
* \param send_interface an integer specifying an OUT interface number
* \param send_endpoint an integer specifying an OUT endpoint number
* \param hints optional parameters to pass to the underlying transport
* \return a new zero copy USB object
*/
static sptr make(
usb_device_handle::sptr handle,
const int recv_interface,
const unsigned char recv_endpoint,
const int send_interface,
const unsigned char send_endpoint,
const device_addr_t &hints = device_addr_t()
);
};
}} //namespace
#endif /* INCLUDED_UHD_TRANSPORT_USB_ZERO_COPY_HPP */
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