usrp2: work on alternative stream destination

3 files changed, 67 insertions, 0 deletions

diff --git a/host/lib/usrp/usrp2/fw_common.h b/host/lib/usrp/usrp2/fw_common.h
index 0babf7445..2add74c47 100644
--- a/host/lib/usrp/usrp2/fw_common.h
+++ b/host/lib/usrp/usrp2/fw_common.h
@@ -37,6 +37,13 @@ extern "C" {
 //used to differentiate control packets over data port
 #define USRP2_INVALID_VRT_HEADER 0
 
+typedef struct{
+    uint32_t sequence;
+    uint32_t vrt_hdr;
+    uint32_t ip_addr;
+    uint32_t udp_port;
+} usrp2_stream_ctrl_t;
+
 // udp ports for the usrp2 communication
 // Dynamic and/or private ports: 49152-65535
 #define USRP2_UDP_CTRL_PORT 49152
@@ -65,6 +72,8 @@ extern "C" {
 ////////////////////////////////////////////////////////////////////////
 #define USRP2_EE_MBOARD_REV      0x00 //2 bytes, little-endian (historic, don't blame me)
 #define USRP2_EE_MBOARD_MAC_ADDR 0x02 //6 bytes
+#define USRP2_EE_MBOARD_GATEWAY  0x38 //uint32, big-endian
+#define USRP2_EE_MBOARD_SUBNET   0x08 //uint32, big-endian
 #define USRP2_EE_MBOARD_IP_ADDR  0x0C //uint32, big-endian
 #define USRP2_EE_MBOARD_BOOTLOADER_FLAGS 0xF7
 
diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp
index d32ffb62c..ea4aa716c 100644
--- a/host/lib/usrp/usrp2/io_impl.cpp
+++ b/host/lib/usrp/usrp2/io_impl.cpp
@@ -21,6 +21,7 @@
 #include "../../transport/super_send_packet_handler.hpp"
 #include "usrp2_impl.hpp"
 #include "usrp2_regs.hpp"
+#include "fw_common.h"
 #include <uhd/utils/log.hpp>
 #include <uhd/utils/msg.hpp>
 #include <uhd/utils/tasks.hpp>
@@ -31,6 +32,7 @@
 #include <boost/thread/thread.hpp>
 #include <boost/format.hpp>
 #include <boost/bind.hpp>
+#include <boost/asio.hpp>
 #include <boost/thread/mutex.hpp>
 #include <boost/make_shared.hpp>
 #include <iostream>
@@ -361,6 +363,60 @@ bool usrp2_impl::recv_async_msg(
 }
 
 /***********************************************************************
+ * Stream destination programmer
+ **********************************************************************/
+void usrp2_impl::program_stream_dest(
+    zero_copy_if::sptr &xport, const uhd::stream_args_t &args
+){
+    //perform an initial flush of transport
+    while (xport->get_recv_buff(0.0)){}
+
+    //program the stream command
+    usrp2_stream_ctrl_t stream_ctrl = usrp2_stream_ctrl_t();
+    stream_ctrl.sequence = uhd::htonx(boost::uint32_t(0 /* don't care seq num */));
+    stream_ctrl.vrt_hdr = uhd::htonx(boost::uint32_t(USRP2_INVALID_VRT_HEADER));
+
+    //user has provided an alternative address and port for destination
+    if (args.args.has_key("addr") and args.args.has_key("port")){
+        UHD_MSG(status) << boost::format(
+            "Programming streaming destination for custom address.\n"
+            "IPv4 Address: %s, UDP Port: %s\n"
+        ) % args.args["addr"] % args.args["port"] << std::endl;
+
+        asio::io_service io_service;
+        asio::ip::udp::resolver resolver(io_service);
+        asio::ip::udp::resolver::query query(asio::ip::udp::v4(), args.args["addr"], args.args["port"]);
+        asio::ip::udp::endpoint endpoint = *resolver.resolve(query);
+        stream_ctrl.ip_addr = uhd::htonx(boost::uint32_t(endpoint.address().to_v4().to_ulong()));
+        stream_ctrl.udp_port = uhd::htonx(boost::uint32_t(endpoint.port()));
+
+        for (size_t i = 0; i < 3; i++){
+            UHD_MSG(status) << "ARP attempt " << i << std::endl;
+            managed_send_buffer::sptr send_buff = xport->get_send_buff();
+            std::memcpy(send_buff->cast<void *>(), &stream_ctrl, sizeof(stream_ctrl));
+            send_buff->commit(sizeof(stream_ctrl));
+            boost::this_thread::sleep(boost::posix_time::milliseconds(300));
+            managed_recv_buffer::sptr recv_buff = xport->get_recv_buff(0.0);
+            if (recv_buff and recv_buff->size() >= sizeof(boost::uint32_t)){
+                const boost::uint32_t result = uhd::ntohx(recv_buff->cast<const boost::uint32_t *>()[0]);
+                if (result == 0){
+                    UHD_MSG(status) << "Success! " << std::endl;
+                    return;
+                }
+            }
+        }
+        throw uhd::runtime_error("Device failed to ARP when programming alternative streaming destination.");
+    }
+
+    else{
+        //send the partial stream control without destination
+        managed_send_buffer::sptr send_buff = xport->get_send_buff();
+        std::memcpy(send_buff->cast<void *>(), &stream_ctrl, sizeof(stream_ctrl));
+        send_buff->commit(sizeof(stream_ctrl)/2);
+    }
+}
+
+/***********************************************************************
  * Receive streamer
  **********************************************************************/
 rx_streamer::sptr usrp2_impl::get_rx_stream(const uhd::stream_args_t &args_){
@@ -406,6 +462,7 @@ rx_streamer::sptr usrp2_impl::get_rx_stream(const uhd::stream_args_t &args_){
                 const size_t dsp = chan + _mbc[mb].rx_chan_occ - num_chan_so_far;
                 _mbc[mb].rx_dsps[dsp]->set_nsamps_per_packet(spp); //seems to be a good place to set this
                 _mbc[mb].rx_dsps[dsp]->setup(args);
+                this->program_stream_dest(_mbc[mb].rx_dsp_xports[dsp], args);
                 my_streamer->set_xport_chan_get_buff(chan_i, boost::bind(
                     &zero_copy_if::get_recv_buff, _mbc[mb].rx_dsp_xports[dsp], _1
                 ), true /*flush*/);
diff --git a/host/lib/usrp/usrp2/usrp2_impl.hpp b/host/lib/usrp/usrp2/usrp2_impl.hpp
index e5065c02d..6053c3890 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.hpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.hpp
@@ -129,6 +129,7 @@ private:
     double set_tx_dsp_freq(const std::string &, const double);
     uhd::meta_range_t get_tx_dsp_freq_range(const std::string &);
     void update_clock_source(const std::string &, const std::string &);
+    void program_stream_dest(uhd::transport::zero_copy_if::sptr &, const uhd::stream_args_t &);
 };
 
 #endif /* INCLUDED_USRP2_IMPL_HPP */