From ebef8c34191ce3f26b62776f35f7da32a34cc660 Mon Sep 17 00:00:00 2001
From: Alex Williams <alex.williams@ni.com>
Date: Tue, 20 Aug 2019 15:48:24 -0700
Subject: transport: Port liberio to link_if

---
 host/lib/include/uhdlib/transport/liberio_link.hpp | 180 +++++++++++++++++++++
 1 file changed, 180 insertions(+)
 create mode 100644 host/lib/include/uhdlib/transport/liberio_link.hpp

(limited to 'host/lib/include/uhdlib/transport')

diff --git a/host/lib/include/uhdlib/transport/liberio_link.hpp b/host/lib/include/uhdlib/transport/liberio_link.hpp
new file mode 100644
index 000000000..8ab90976a
--- /dev/null
+++ b/host/lib/include/uhdlib/transport/liberio_link.hpp
@@ -0,0 +1,180 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#ifndef INCLUDED_UHDLIB_TRANSPORT_LIBERIO_LINK_HPP
+#define INCLUDED_UHDLIB_TRANSPORT_LIBERIO_LINK_HPP
+
+#include <uhd/config.hpp>
+#include <uhd/transport/buffer_pool.hpp>
+#include <uhd/types/device_addr.hpp>
+#include <uhdlib/transport/adapter_info.hpp>
+#include <uhdlib/transport/link_base.hpp>
+#include <liberio/liberio.h>
+#include <cassert>
+#include <string>
+#include <vector>
+
+namespace uhd { namespace transport {
+
+class liberio_frame_buff : public frame_buff
+{
+public:
+    liberio_frame_buff(struct liberio_chan* chan) : _chan(chan)
+    {
+        assert(_chan);
+        // Acquire channel reference
+        liberio_chan_get(_chan);
+    }
+
+    ~liberio_frame_buff()
+    {
+        if (_buff) {
+            // Set payload size to signify "empty"
+            liberio_buf_set_payload(_buff, 0, 0);
+
+            // Release buffer back to liberio
+            liberio_chan_buf_enqueue(_chan, _buff);
+            _buff = nullptr;
+            _data = nullptr;
+        }
+        // Release channel reference
+        liberio_chan_put(_chan);
+    }
+
+    liberio_frame_buff(const liberio_frame_buff& src)
+        : liberio_frame_buff(src._chan) {}
+
+    UHD_FORCE_INLINE size_t get(int32_t timeout_ms)
+    {
+        // Dequeue timeout in microseconds
+        _buff = liberio_chan_buf_dequeue(_chan, timeout_ms * 1000);
+        if (!_buff) {
+            return 0;
+        }
+        _packet_size = liberio_buf_get_len(_buff, 0);
+        _data = liberio_buf_get_mem(_buff, 0);
+        return _packet_size;
+    }
+
+    UHD_FORCE_INLINE void release()
+    {
+        assert(_buff);
+        liberio_buf_set_payload(_buff, 0, _packet_size);
+        liberio_chan_buf_enqueue(_chan, _buff);
+        _buff = nullptr;
+        _data = nullptr;
+    }
+private:
+    struct liberio_buf* _buff = nullptr;
+    struct liberio_chan* _chan;
+};
+
+class liberio_adapter_info : public adapter_info
+{
+public:
+    liberio_adapter_info() = default;
+    ~liberio_adapter_info() = default;
+
+    std::string to_string()
+    {
+        // Currently, there is only ever one liberio adapter
+        // If that changes, fix this!
+        return std::string("Liberio");
+    }
+
+    bool operator==(const liberio_adapter_info& /*rhs*/) const
+    {
+        // Currently, there is only ever one liberio adapter
+        // If that changes, fix this!
+        return true;
+    }
+};
+
+/*!
+ * A zero copy transport interface to the liberio DMA library.
+ */
+class liberio_link : public recv_link_base<liberio_link>,
+                     public send_link_base<liberio_link>
+{
+public:
+    using sptr = std::shared_ptr<liberio_link>;
+
+    liberio_link(
+        const std::string& tx_path, const std::string& rx_path, const link_params_t& params);
+
+    ~liberio_link();
+
+    /*!
+     * Make a new liberio link.
+     *
+     * \param tx_path a path string to the TX DMA device
+     * \param rx_path a path string to the RX DMA device
+     * \param params Values for frame sizes, num frames, and buffer sizes
+     * \return a shared_ptr to a new liberio link
+     */
+    static sptr make(const std::string& tx_path,
+        const std::string& rx_path,
+        const link_params_t& params);
+
+    /*!
+     * Get the physical adapter ID used for this link
+     */
+    adapter_id_t get_send_adapter_id() const
+    {
+        return _adapter_id;
+    }
+
+    /*!
+     * Get the physical adapter ID used for this link
+     */
+    adapter_id_t get_recv_adapter_id() const
+    {
+        return _adapter_id;
+    }
+
+private:
+    using recv_link_base_t = recv_link_base<liberio_link>;
+    using send_link_base_t = send_link_base<liberio_link>;
+
+    // Friend declarations to allow base classes to call private methods
+    friend recv_link_base_t;
+    friend send_link_base_t;
+
+    // Methods called by recv_link_base
+    size_t get_recv_buff_derived(frame_buff& buff, int32_t timeout_ms)
+    {
+        auto& buffer = static_cast<liberio_frame_buff&>(buff);
+        return buffer.get(timeout_ms);
+    }
+
+    void release_recv_buff_derived(frame_buff& buff)
+    {
+        auto& buffer = static_cast<liberio_frame_buff&>(buff);
+        buffer.release();
+    }
+
+    bool get_send_buff_derived(frame_buff& buff, int32_t timeout_ms)
+    {
+        auto& buffer = static_cast<liberio_frame_buff&>(buff);
+        return buffer.get(timeout_ms);
+    }
+
+    void release_send_buff_derived(frame_buff& buff)
+    {
+        auto& buffer = static_cast<liberio_frame_buff&>(buff);
+        buffer.release();
+    }
+
+    struct liberio_chan* _tx_chan;
+    struct liberio_chan* _rx_chan;
+    std::vector<liberio_frame_buff> _recv_buffs;
+    std::vector<liberio_frame_buff> _send_buffs;
+    adapter_id_t _adapter_id;
+};
+
+}} // namespace uhd::transport
+
+#endif /* INCLUDED_UHDLIB_TRANSPORT_LIBERIO_LINK_HPP */
-- 
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