From d7e5a630edbec5a9b9b3a2794ee1133ffcc405f5 Mon Sep 17 00:00:00 2001
From: Ciro Nishiguchi <ciro.nishiguchi@ni.com>
Date: Tue, 3 Dec 2019 19:18:46 -0600
Subject: usrp: Add I/O service manager for DPDK

---
 .../uhdlib/usrp/common/dpdk_io_service_mgr.hpp     | 69 ++++++++++++++++++++++
 host/lib/usrp/common/CMakeLists.txt                |  8 +++
 host/lib/usrp/common/io_service_mgr.cpp            | 16 +++++
 3 files changed, 93 insertions(+)
 create mode 100644 host/lib/include/uhdlib/usrp/common/dpdk_io_service_mgr.hpp

(limited to 'host/lib')

diff --git a/host/lib/include/uhdlib/usrp/common/dpdk_io_service_mgr.hpp b/host/lib/include/uhdlib/usrp/common/dpdk_io_service_mgr.hpp
new file mode 100644
index 000000000..018f78f38
--- /dev/null
+++ b/host/lib/include/uhdlib/usrp/common/dpdk_io_service_mgr.hpp
@@ -0,0 +1,69 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#ifndef INCLUDED_UHDLIB_TRANSPORT_DPDK_IO_SERVICE_MGR_HPP
+#define INCLUDED_UHDLIB_TRANSPORT_DPDK_IO_SERVICE_MGR_HPP
+
+#include <uhdlib/transport/dpdk/common.hpp>
+#include <uhdlib/transport/dpdk_io_service.hpp>
+#include <uhdlib/transport/udp_dpdk_link.hpp>
+#include <uhdlib/usrp/common/io_service_mgr.hpp>
+
+namespace uhd { namespace usrp {
+
+class dpdk_io_service_mgr_impl : public io_service_mgr
+{
+public:
+    dpdk_io_service_mgr_impl()
+    {
+        _dpdk_ctx = transport::dpdk::dpdk_ctx::get();
+    }
+
+    transport::io_service::sptr connect_links(transport::recv_link_if::sptr recv_link,
+        transport::send_link_if::sptr send_link,
+        const transport::link_type_t /*link_type*/,
+        const io_service_args_t& /*default_args*/,
+        const uhd::device_addr_t& /*stream_args*/,
+        const std::string& /*streamer_id*/)
+    {
+        auto io_srv = _get_io_service(recv_link, send_link);
+        io_srv->attach_recv_link(recv_link);
+        io_srv->attach_send_link(send_link);
+        return io_srv;
+    }
+
+    void disconnect_links(
+        transport::recv_link_if::sptr recv_link, transport::send_link_if::sptr send_link)
+    {
+        auto io_srv = _get_io_service(recv_link, send_link);
+        io_srv->detach_recv_link(recv_link);
+        io_srv->detach_send_link(send_link);
+    }
+
+private:
+    transport::io_service::sptr _get_io_service(
+        transport::recv_link_if::sptr recv_link, transport::send_link_if::sptr send_link)
+    {
+        using namespace transport::dpdk;
+
+        // For DPDK, the same object implements the send and recv link
+        // interfaces so we should always have both parameters.
+        UHD_ASSERT_THROW(recv_link && send_link);
+
+        auto link = std::dynamic_pointer_cast<transport::udp_dpdk_link>(recv_link);
+        port_id_t port_id = link->get_port()->get_port_id();
+
+        auto io_srv = _dpdk_ctx->get_io_service(port_id);
+        UHD_ASSERT_THROW(io_srv);
+        return io_srv;
+    }
+
+    transport::dpdk::dpdk_ctx::sptr _dpdk_ctx;
+};
+
+}} // namespace uhd::usrp
+
+#endif /* INCLUDED_UHDLIB_TRANSPORT_DPDK_IO_SERVICE_MGR_HPP */
diff --git a/host/lib/usrp/common/CMakeLists.txt b/host/lib/usrp/common/CMakeLists.txt
index e4048fdf7..7a6a4fe27 100644
--- a/host/lib/usrp/common/CMakeLists.txt
+++ b/host/lib/usrp/common/CMakeLists.txt
@@ -36,3 +36,11 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_CURRENT_SOURCE_DIR}/io_service_mgr.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/io_service_args.cpp
 )
+
+if(ENABLE_DPDK)
+    set_property(
+        SOURCE
+        ${CMAKE_CURRENT_SOURCE_DIR}/io_service_mgr.cpp
+        PROPERTY COMPILE_DEFINITIONS HAVE_DPDK
+    )
+endif(ENABLE_DPDK)
diff --git a/host/lib/usrp/common/io_service_mgr.cpp b/host/lib/usrp/common/io_service_mgr.cpp
index 707618c11..19c06a826 100644
--- a/host/lib/usrp/common/io_service_mgr.cpp
+++ b/host/lib/usrp/common/io_service_mgr.cpp
@@ -10,7 +10,11 @@
 #include <uhd/utils/log.hpp>
 #include <uhdlib/transport/inline_io_service.hpp>
 #include <uhdlib/transport/offload_io_service.hpp>
+#ifdef HAVE_DPDK
+#    include <uhdlib/usrp/common/dpdk_io_service_mgr.hpp>
+#endif
 #include <uhdlib/usrp/common/io_service_mgr.hpp>
+#include <uhdlib/usrp/constrained_device_args.hpp>
 #include <map>
 #include <vector>
 
@@ -450,6 +454,18 @@ private:
 
 io_service_mgr::sptr io_service_mgr::make(const uhd::device_addr_t& args)
 {
+    constrained_device_args_t::bool_arg use_dpdk("use_dpdk", false);
+    if (args.has_key(use_dpdk.key())) {
+        use_dpdk.parse(args[use_dpdk.key()]);
+    }
+
+    if (use_dpdk.get()) {
+#ifdef HAVE_DPDK
+        return std::make_shared<dpdk_io_service_mgr_impl>();
+#else
+        UHD_LOG_WARNING(LOG_ID, "Cannot instantiate DPDK I/O service. Proceeding with regular I/O service.");
+#endif
+    }
     return std::make_shared<io_service_mgr_impl>(args);
 }
 
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