tests: Add benchmark of streaming code paths

Add a benchmark of packet handlers and device3 flow control. Benchmarks
use mock transport objects.

3 files changed, 104 insertions, 20 deletions

diff --git a/host/tests/common/CMakeLists.txt b/host/tests/common/CMakeLists.txt
index e48e85c2f..58299c688 100644
--- a/host/tests/common/CMakeLists.txt
+++ b/host/tests/common/CMakeLists.txt
@@ -12,4 +12,4 @@ add_library(uhd_test ${CMAKE_CURRENT_SOURCE_DIR}/mock_ctrl_iface_impl.cpp
                      ${CMAKE_CURRENT_SOURCE_DIR}/mock_zero_copy.cpp
                      ${CMAKE_SOURCE_DIR}/lib/rfnoc/graph_impl.cpp
                      ${CMAKE_SOURCE_DIR}/lib/rfnoc/async_msg_handler.cpp
-)
\ No newline at end of file
+)
diff --git a/host/tests/common/mock_zero_copy.cpp b/host/tests/common/mock_zero_copy.cpp
index eee96234d..bc49c3f10 100644
--- a/host/tests/common/mock_zero_copy.cpp
+++ b/host/tests/common/mock_zero_copy.cpp
@@ -11,8 +11,12 @@
 using namespace uhd::transport;
 
 mock_zero_copy::mock_zero_copy(
-    vrt::if_packet_info_t::link_type_t link_type
-) : _link_type(link_type) {
+    vrt::if_packet_info_t::link_type_t link_type,
+    size_t recv_frame_size,
+    size_t send_frame_size
+) : _link_type(link_type)
+  , _recv_frame_size(recv_frame_size)
+  , _send_frame_size(send_frame_size) {
 }
 
 uhd::transport::managed_recv_buffer::sptr mock_zero_copy::get_recv_buff(double) {
@@ -22,18 +26,32 @@ uhd::transport::managed_recv_buffer::sptr mock_zero_copy::get_recv_buff(double)
     if (_rx_mems.empty()) {
         return uhd::transport::managed_recv_buffer::sptr(); // timeout
     }
-    _mrbs.push_back(boost::make_shared<mock_mrb>());
+
     uhd::transport::managed_recv_buffer::sptr mrb =
-        _mrbs.back()->get_new(_rx_mems.front(), _rx_lens.front());
-    _rx_mems.pop_front();
-    _rx_lens.pop_front();
+        _mrb.get_new(_rx_mems.front(), _rx_lens.front());
+
+    if (not _reuse_recv_memory) {
+        _rx_mems.pop_front();
+        _rx_lens.pop_front();
+    }
+
     return mrb;
 }
 
 uhd::transport::managed_send_buffer::sptr mock_zero_copy::get_send_buff(double) {
-    _msbs.push_back(boost::make_shared<mock_msb>());
-    _tx_mems.push_back(
-        boost::shared_array<uint8_t>(new uint8_t[SEND_BUFF_SIZE]));
-    _tx_lens.push_back(SEND_BUFF_SIZE);
-    return _msbs.back()->get_new(_tx_mems.back(), &_tx_lens.back());
+    if (not _reuse_send_memory or _tx_mems.size() == 0) {
+        _tx_mems.push_back(
+            boost::shared_array<uint8_t>(new uint8_t[_send_frame_size]));
+        _tx_lens.push_back(_send_frame_size);
+    }
+
+    return _msb.get_new(_tx_mems.back(), &_tx_lens.back());
+}
+
+void mock_zero_copy::set_reuse_recv_memory(bool reuse_recv) {
+    _reuse_recv_memory = reuse_recv;
+}
+
+void mock_zero_copy::set_reuse_send_memory(bool reuse_send) {
+    _reuse_send_memory = reuse_send;
 }
diff --git a/host/tests/common/mock_zero_copy.hpp b/host/tests/common/mock_zero_copy.hpp
index 867300ac5..8d27c9b46 100644
--- a/host/tests/common/mock_zero_copy.hpp
+++ b/host/tests/common/mock_zero_copy.hpp
@@ -13,6 +13,7 @@
 #include <uhd/transport/zero_copy.hpp>
 #include <uhd/types/endianness.hpp>
 #include <uhd/types/sid.hpp>
+#include <uhd/exception.hpp>
 #include <uhd/utils/byteswap.hpp>
 #include <uhd/exception.hpp>
 #include <boost/make_shared.hpp>
@@ -29,8 +30,8 @@
  * Tx and Rx are separate. We can access the other end of the FIFOs from
  * this class.
  */
-static constexpr size_t SEND_BUFF_SIZE = 1024;
-static constexpr size_t RECV_BUFF_SIZE = 1024;
+static constexpr size_t DEFAULT_SEND_FRAME_SIZE = 1024;
+static constexpr size_t DEFAULT_RECV_FRAME_SIZE = 1024;
 
 /***********************************************************************
  * Dummy managed buffers for testing
@@ -68,15 +69,28 @@ class mock_zero_copy : public uhd::transport::zero_copy_if {
     public:
     typedef boost::shared_ptr<mock_zero_copy> sptr;
 
-    mock_zero_copy(uhd::transport::vrt::if_packet_info_t::link_type_t type);
+    mock_zero_copy(
+        uhd::transport::vrt::if_packet_info_t::link_type_t type,
+        size_t recv_frame_size = DEFAULT_RECV_FRAME_SIZE,
+        size_t send_frame_size = DEFAULT_SEND_FRAME_SIZE
+    );
 
     uhd::transport::managed_recv_buffer::sptr get_recv_buff(double);
     uhd::transport::managed_send_buffer::sptr get_send_buff(double);
 
     size_t get_num_recv_frames(void) const { return 1; }
     size_t get_num_send_frames(void) const { return 1; }
-    size_t get_recv_frame_size(void) const { return RECV_BUFF_SIZE; }
-    size_t get_send_frame_size(void) const { return SEND_BUFF_SIZE; }
+    size_t get_recv_frame_size(void) const { return _recv_frame_size; }
+    size_t get_send_frame_size(void) const { return _send_frame_size; }
+
+    template <typename T>
+    void push_back_packet(
+        uhd::transport::vrt::if_packet_info_t& ifpi,
+        const std::vector<T>& otw_data = std::vector<T>(),
+        uhd::endianness_t endianness = uhd::ENDIANNESS_BIG);
+
+    void set_reuse_recv_memory(bool reuse_recv);
+    void set_reuse_send_memory(bool reuse_send);
 
     void set_simulate_io_error(bool status) { _simulate_io_error = status; }
 
@@ -93,6 +107,13 @@ class mock_zero_copy : public uhd::transport::zero_copy_if {
     );
 
     template <uhd::endianness_t endianness = uhd::ENDIANNESS_BIG>
+    void push_back_flow_ctrl_packet(
+        uhd::transport::vrt::if_packet_info_t::packet_type_t type,
+        uint32_t packet_count,
+        uint32_t byte_count
+    );
+
+    template <uhd::endianness_t endianness = uhd::ENDIANNESS_BIG>
     void pop_send_packet(
         uhd::transport::vrt::if_packet_info_t &ifpi
     );
@@ -104,11 +125,18 @@ class mock_zero_copy : public uhd::transport::zero_copy_if {
     std::list<boost::shared_array<uint8_t>> _rx_mems;
     std::list<size_t> _rx_lens;
 
-    std::vector<boost::shared_ptr<mock_msb>> _msbs;
-    std::vector<boost::shared_ptr<mock_mrb>> _mrbs;
+    mock_msb _msb;
+    mock_mrb _mrb;
 
     uhd::transport::vrt::if_packet_info_t::link_type_t _link_type;
+    size_t _recv_frame_size = DEFAULT_RECV_FRAME_SIZE;
+    size_t _send_frame_size = DEFAULT_RECV_FRAME_SIZE;
+
     bool _simulate_io_error = false;
+
+    bool _reuse_recv_memory = false;
+    bool _reuse_send_memory = false;
+
 };
 
 template <typename T, uhd::endianness_t endianness>
@@ -130,7 +158,7 @@ void mock_zero_copy::push_back_recv_packet(
     const size_t max_pkt_len =
         ifpi.num_payload_words32*sizeof(uint32_t)+max_hdr_len;
 
-    UHD_ASSERT_THROW(max_pkt_len <= RECV_BUFF_SIZE);
+    UHD_ASSERT_THROW(max_pkt_len <= _recv_frame_size);
 
     // Create recv buffer
     _rx_mems.push_back(boost::shared_array<uint8_t>(new uint8_t[max_pkt_len]));
@@ -199,4 +227,42 @@ void mock_zero_copy::pop_send_packet(
     _tx_lens.pop_front();
 }
 
+template <uhd::endianness_t endianness>
+void mock_zero_copy::push_back_flow_ctrl_packet(
+    uhd::transport::vrt::if_packet_info_t::packet_type_t type,
+    uint32_t packet_count,
+    uint32_t byte_count
+)
+{
+    using namespace uhd::transport;
+
+    UHD_ASSERT_THROW(
+        type == vrt::if_packet_info_t::PACKET_TYPE_FC or
+        type == vrt::if_packet_info_t::PACKET_TYPE_ACK);
+
+    // Only implemented for chdr packets currently
+    UHD_ASSERT_THROW(_link_type == vrt::if_packet_info_t::LINK_TYPE_CHDR);
+
+    const size_t packet_len_in_words32 = 2;
+
+    vrt::if_packet_info_t ifpi;
+    ifpi.packet_type = type;
+    ifpi.num_payload_words32 = packet_len_in_words32;
+    ifpi.num_payload_bytes = ifpi.num_payload_words32*sizeof(uint32_t);
+    ifpi.has_tsf = false;
+
+    std::vector<uint32_t> data(packet_len_in_words32, 0);
+
+    if (endianness == uhd::ENDIANNESS_BIG) {
+        data[0] = uhd::ntohx(packet_count);
+        data[1] = uhd::ntohx(byte_count);
+    }
+    else {
+        data[0] = uhd::wtohx(packet_count);
+        data[1] = uhd::wtohx(byte_count);
+    }
+
+    push_back_recv_packet<uint32_t, endianness>(ifpi, data);
+}
+
 #endif /*INCLUDED_MOCK_XPORT_HPP*/