From 614d4901bb9dbb6866a0c5f57b1397e4b185a11f Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Fri, 1 Jul 2011 16:54:53 -0700
Subject: usrp: created common code to demux an rx stream (b100, e100)

---
 host/lib/usrp/common/CMakeLists.txt           |  9 ++-
 host/lib/usrp/common/recv_packet_demuxer.cpp  | 87 +++++++++++++++++++++++++++
 host/lib/usrp/common/recv_packet_demuxer.hpp  | 41 +++++++++++++
 host/lib/usrp/common/validate_subdev_spec.hpp |  1 -
 4 files changed, 135 insertions(+), 3 deletions(-)
 create mode 100644 host/lib/usrp/common/recv_packet_demuxer.cpp
 create mode 100644 host/lib/usrp/common/recv_packet_demuxer.hpp

(limited to 'host/lib/usrp/common')

diff --git a/host/lib/usrp/common/CMakeLists.txt b/host/lib/usrp/common/CMakeLists.txt
index 31004d952..ec8b60fec 100644
--- a/host/lib/usrp/common/CMakeLists.txt
+++ b/host/lib/usrp/common/CMakeLists.txt
@@ -20,10 +20,15 @@
 ########################################################################
 IF(ENABLE_USB)
     INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/../firmware/fx2/common)
-    INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR})
 
     LIBUHD_APPEND_SOURCES(
         ${CMAKE_CURRENT_SOURCE_DIR}/fx2_ctrl.cpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/validate_subdev_spec.cpp
     )
 ENDIF(ENABLE_USB)
+
+INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR})
+
+LIBUHD_APPEND_SOURCES(
+    ${CMAKE_CURRENT_SOURCE_DIR}/validate_subdev_spec.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/recv_packet_demuxer.cpp
+)
diff --git a/host/lib/usrp/common/recv_packet_demuxer.cpp b/host/lib/usrp/common/recv_packet_demuxer.cpp
new file mode 100644
index 000000000..93f423aeb
--- /dev/null
+++ b/host/lib/usrp/common/recv_packet_demuxer.cpp
@@ -0,0 +1,87 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "recv_packet_demuxer.hpp"
+#include <uhd/utils/msg.hpp>
+#include <uhd/utils/byteswap.hpp>
+#include <boost/thread/mutex.hpp>
+#include <queue>
+#include <deque>
+#include <vector>
+
+using namespace uhd;
+using namespace uhd::usrp;
+using namespace uhd::transport;
+
+static UHD_INLINE boost::uint32_t extract_sid(managed_recv_buffer::sptr &buff){
+    //ASSUME that the data is in little endian format
+    return uhd::wtohx(buff->cast<const boost::uint32_t *>()[1]);
+}
+
+class recv_packet_demuxer_impl : public uhd::usrp::recv_packet_demuxer{
+public:
+    recv_packet_demuxer_impl(
+        transport::zero_copy_if::sptr transport,
+        const size_t size,
+        const boost::uint32_t sid_base
+    ):
+        _transport(transport), _sid_base(sid_base), _queues(size)
+    {
+        /* NOP */
+    }
+
+    managed_recv_buffer::sptr get_recv_buff(const size_t index, const double timeout){
+        boost::mutex::scoped_lock lock(_mutex);
+        managed_recv_buffer::sptr buff;
+
+        //there is already an entry in the queue, so pop that
+        if (not _queues[index].wrapper.empty()){
+            std::swap(buff, _queues[index].wrapper.front());
+            _queues[index].wrapper.pop();
+            return buff;
+        }
+
+        while (true){
+            //otherwise call into the transport
+            buff = _transport->get_recv_buff(timeout);
+            if (buff.get() == NULL) return buff; //timeout
+
+            //check the stream id to know which channel
+            const size_t rx_index = extract_sid(buff) - _sid_base;
+            if (rx_index == index) return buff; //got expected message
+
+            //otherwise queue and try again
+            if (rx_index < _queues.size()) _queues[rx_index].wrapper.push(buff);
+            else UHD_MSG(error) << "Got a data packet with known SID " << extract_sid(buff) << std::endl;
+        }
+    }
+
+private:
+    transport::zero_copy_if::sptr _transport;
+    const boost::uint32_t _sid_base;
+    boost::mutex _mutex;
+    struct channel_guts_type{
+        channel_guts_type(void): wrapper(container){}
+        std::deque<managed_recv_buffer::sptr> container;
+        std::queue<managed_recv_buffer::sptr> wrapper;
+    };
+    std::vector<channel_guts_type> _queues;
+};
+
+recv_packet_demuxer::sptr recv_packet_demuxer::make(transport::zero_copy_if::sptr transport, const size_t size, const boost::uint32_t sid_base){
+    return sptr(new recv_packet_demuxer_impl(transport, size, sid_base));
+}
diff --git a/host/lib/usrp/common/recv_packet_demuxer.hpp b/host/lib/usrp/common/recv_packet_demuxer.hpp
new file mode 100644
index 000000000..fde756d27
--- /dev/null
+++ b/host/lib/usrp/common/recv_packet_demuxer.hpp
@@ -0,0 +1,41 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_HPP
+#define INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_HPP
+
+#include <uhd/config.hpp>
+#include <uhd/transport/zero_copy.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/cstdint.hpp>
+
+namespace uhd{ namespace usrp{
+
+    class recv_packet_demuxer{
+    public:
+        typedef boost::shared_ptr<recv_packet_demuxer> sptr;
+
+        //! Make a new demuxer from a transport and parameters
+        static sptr make(transport::zero_copy_if::sptr transport, const size_t size, const boost::uint32_t sid_base);
+
+        //! Get a buffer at the given index from the transport
+        virtual transport::managed_recv_buffer::sptr get_recv_buff(const size_t index, const double timeout) = 0;
+    };
+
+}} //namespace uhd::usrp
+
+#endif /* INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_HPP */
diff --git a/host/lib/usrp/common/validate_subdev_spec.hpp b/host/lib/usrp/common/validate_subdev_spec.hpp
index e73b3e1ee..7d9e2c309 100644
--- a/host/lib/usrp/common/validate_subdev_spec.hpp
+++ b/host/lib/usrp/common/validate_subdev_spec.hpp
@@ -20,7 +20,6 @@
 
 #include <uhd/config.hpp>
 #include <uhd/usrp/subdev_spec.hpp>
-#include <uhd/utils/assert_has.hpp>
 #include <uhd/property_tree.hpp>
 #include <string>
 
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