Merge branch 'martin/warn_sampling_rate'

Warn users if they request a sample rate greater than the interface bandwidth.

10 files changed, 62 insertions, 3 deletions

diff --git a/host/lib/usrp/b100/b100_impl.cpp b/host/lib/usrp/b100/b100_impl.cpp
index a47856b07..cb32a596c 100644
--- a/host/lib/usrp/b100/b100_impl.cpp
+++ b/host/lib/usrp/b100/b100_impl.cpp
@@ -515,6 +515,7 @@ b100_impl::b100_impl(const device_addr_t &device_addr){
     _tree->access<subdev_spec_t>(mb_path / "tx_subdev_spec").set(subdev_spec_t("A:" + _tree->list(mb_path / "dboards/A/tx_frontends").at(0)));
     _tree->access<std::string>(mb_path / "clock_source/value").set("internal");
     _tree->access<std::string>(mb_path / "time_source/value").set("none");
+    _tree->create<double>(mb_path / "link_max_rate").set(B100_MAX_RATE_USB2);
 }
 
 b100_impl::~b100_impl(void){
diff --git a/host/lib/usrp/b100/b100_impl.hpp b/host/lib/usrp/b100/b100_impl.hpp
index 7d71d5ec3..b6752681e 100644
--- a/host/lib/usrp/b100/b100_impl.hpp
+++ b/host/lib/usrp/b100/b100_impl.hpp
@@ -54,6 +54,7 @@ static const boost::uint32_t B100_CTRL_MSG_SID = 20;
 static const double          B100_DEFAULT_TICK_RATE = 64e6;
 static const size_t          B100_MAX_PKT_BYTE_LIMIT = 2048;
 static const std::string     B100_EEPROM_MAP_KEY = "B100";
+static const size_t          B100_MAX_RATE_USB2  =  32000000; // bytes/s
 
 #define I2C_ADDR_TX_A       (I2C_DEV_EEPROM | 0x4)
 #define I2C_ADDR_RX_A       (I2C_DEV_EEPROM | 0x5)
diff --git a/host/lib/usrp/b200/b200_impl.cpp b/host/lib/usrp/b200/b200_impl.cpp
index 9dd3a424d..84310a9fe 100644
--- a/host/lib/usrp/b200/b200_impl.cpp
+++ b/host/lib/usrp/b200/b200_impl.cpp
@@ -250,6 +250,7 @@ b200_impl::b200_impl(const device_addr_t &device_addr)
         ctrl_xport_args
     );
     while (_ctrl_transport->get_recv_buff(0.0)){} //flush ctrl xport
+    _tree->create<double>(mb_path / "link_max_rate").set((usb_speed == 3) ? B200_MAX_RATE_USB3 : B200_MAX_RATE_USB2);
 
     ////////////////////////////////////////////////////////////////////
     // Async task structure
diff --git a/host/lib/usrp/b200/b200_impl.hpp b/host/lib/usrp/b200/b200_impl.hpp
index 7d98a8f8d..c3508c550 100644
--- a/host/lib/usrp/b200/b200_impl.hpp
+++ b/host/lib/usrp/b200/b200_impl.hpp
@@ -47,11 +47,13 @@
 static const boost::uint8_t  B200_FW_COMPAT_NUM_MAJOR = 0x04;
 static const boost::uint8_t  B200_FW_COMPAT_NUM_MINOR = 0x00;
 static const boost::uint16_t B200_FPGA_COMPAT_NUM = 0x03;
-static const double          B200_LINK_RATE_BPS = (5e9)/8; //practical link rate (5 Gbps)
 static const double          B200_BUS_CLOCK_RATE = 100e6;
 static const double          B200_DEFAULT_TICK_RATE = 32e6;
 static const boost::uint32_t B200_GPSDO_ST_NONE = 0x83;
 
+static const size_t B200_MAX_RATE_USB2              =  32000000; // bytes/s
+static const size_t B200_MAX_RATE_USB3              = 500000000; // bytes/s
+
 #define FLIP_SID(sid) (((sid)<<16)|((sid)>>16))
 
 static const boost::uint32_t B200_CTRL0_MSG_SID = 0x00000010;
diff --git a/host/lib/usrp/multi_usrp.cpp b/host/lib/usrp/multi_usrp.cpp
index f08709669..4883b2410 100644
--- a/host/lib/usrp/multi_usrp.cpp
+++ b/host/lib/usrp/multi_usrp.cpp
@@ -24,6 +24,7 @@
 #include <uhd/usrp/dboard_id.hpp>
 #include <uhd/usrp/mboard_eeprom.hpp>
 #include <uhd/usrp/dboard_eeprom.hpp>
+#include <uhd/convert.hpp>
 #include <boost/assign/list_of.hpp>
 #include <boost/thread.hpp>
 #include <boost/foreach.hpp>
@@ -103,6 +104,8 @@ static meta_range_t make_overall_tune_range(
     return range;
 }
 
+
+
 /***********************************************************************
  * Gain helper functions
  **********************************************************************/
@@ -589,6 +592,11 @@ public:
     /*******************************************************************
      * RX methods
      ******************************************************************/
+    rx_streamer::sptr get_rx_stream(const stream_args_t &args) {
+        _check_link_rate(args, false);
+        return this->get_device()->get_rx_stream(args);
+    }
+
     void set_rx_subdev_spec(const subdev_spec_t &spec, size_t mboard){
         if (mboard != ALL_MBOARDS){
             _tree->access<subdev_spec_t>(mb_root(mboard) / "rx_subdev_spec").set(spec);
@@ -770,6 +778,11 @@ public:
     /*******************************************************************
      * TX methods
      ******************************************************************/
+    tx_streamer::sptr get_tx_stream(const stream_args_t &args) {
+        _check_link_rate(args, true);
+        return this->get_device()->get_tx_stream(args);
+    }
+
     void set_tx_subdev_spec(const subdev_spec_t &spec, size_t mboard){
         if (mboard != ALL_MBOARDS){
             _tree->access<subdev_spec_t>(mb_root(mboard) / "tx_subdev_spec").set(spec);
@@ -1178,6 +1191,34 @@ private:
         }
         return gg;
     }
+
+    //! \param is_tx True for tx
+    // Assumption is that all mboards use the same link
+    bool _check_link_rate(const stream_args_t &args, bool is_tx) {
+        bool link_rate_is_ok = true;
+        size_t bytes_per_sample = convert::get_bytes_per_item(args.otw_format);
+        double max_link_rate = 0;
+        double sum_rate = 0;
+        BOOST_FOREACH(const size_t chan, args.channels) {
+            mboard_chan_pair mcp = is_tx ? tx_chan_to_mcp(chan) : rx_chan_to_mcp(chan);
+            if (_tree->exists(mb_root(mcp.mboard) / "link_max_rate")) {
+                max_link_rate = std::max(
+                    max_link_rate,
+                   _tree->access<double>(mb_root(mcp.mboard) / "link_max_rate").get()
+                );
+            }
+            sum_rate += is_tx ? get_tx_rate(chan) : get_rx_rate(chan);
+        }
+        if (max_link_rate > 0 and (max_link_rate / bytes_per_sample) < sum_rate) {
+            UHD_MSG(warning) << boost::format(
+                "The total sum of rates (%f MSps on %u channels) exceeds the maximum capacity of the connection.\n"
+                "This can cause %s."
+            ) % (sum_rate/1e6) % args.channels.size() % (is_tx ? "underruns (U)" : "overflows (O)")  << std::endl;
+            link_rate_is_ok = false;
+        }
+
+        return link_rate_is_ok;
+    }
 };
 
 /***********************************************************************
diff --git a/host/lib/usrp/usrp1/usrp1_impl.cpp b/host/lib/usrp/usrp1/usrp1_impl.cpp
index 3b902b343..3eaac9839 100644
--- a/host/lib/usrp/usrp1/usrp1_impl.cpp
+++ b/host/lib/usrp/usrp1/usrp1_impl.cpp
@@ -409,7 +409,7 @@ usrp1_impl::usrp1_impl(const device_addr_t &device_addr){
         _tree->access<subdev_spec_t>(mb_path / "rx_subdev_spec").set(_rx_subdev_spec);
     if (_tree->list(mb_path / "tx_dsps").size() > 0)
         _tree->access<subdev_spec_t>(mb_path / "tx_subdev_spec").set(_tx_subdev_spec);
-
+    _tree->create<double>(mb_path / "link_max_rate").set(USRP1_MAX_RATE_USB2);
 }
 
 usrp1_impl::~usrp1_impl(void){
diff --git a/host/lib/usrp/usrp1/usrp1_impl.hpp b/host/lib/usrp/usrp1/usrp1_impl.hpp
index da9fe8b16..012bc0794 100644
--- a/host/lib/usrp/usrp1/usrp1_impl.hpp
+++ b/host/lib/usrp/usrp1/usrp1_impl.hpp
@@ -39,6 +39,7 @@
 #define INCLUDED_USRP1_IMPL_HPP
 
 static const std::string USRP1_EEPROM_MAP_KEY = "B000";
+static const size_t      USRP1_MAX_RATE_USB2  =  32000000; // bytes/s
 
 #define FR_RB_CAPS          3
 #define FR_MODE             13
diff --git a/host/lib/usrp/usrp2/usrp2_impl.cpp b/host/lib/usrp/usrp2/usrp2_impl.cpp
index 16d9b9a54..25f661656 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.cpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.cpp
@@ -442,6 +442,7 @@ usrp2_impl::usrp2_impl(const device_addr_t &_device_addr){
             _mbc[mb].spiface = _mbc[mb].iface;
             break;
         }
+        _tree->create<double>(mb_path / "link_max_rate").set(USRP2_LINK_RATE_BPS);
 
         ////////////////////////////////////////////////////////////////
         // setup the mboard eeprom
diff --git a/host/lib/usrp/x300/x300_impl.cpp b/host/lib/usrp/x300/x300_impl.cpp
index e492b2238..f5e53678c 100644
--- a/host/lib/usrp/x300/x300_impl.cpp
+++ b/host/lib/usrp/x300/x300_impl.cpp
@@ -392,6 +392,8 @@ void x300_impl::setup_mb(const size_t mb_i, const uhd::device_addr_t &dev_addr)
         //Tell the quirks object which FIFOs carry TX stream data
         const uint32_t tx_data_fifos[2] = {X300_RADIO_DEST_PREFIX_TX, X300_RADIO_DEST_PREFIX_TX + 3};
         mb.rio_fpga_interface->get_kernel_proxy().get_rio_quirks().register_tx_streams(tx_data_fifos);
+
+        _tree->create<double>(mb_path / "link_max_rate").set(X300_MAX_RATE_PCIE);
     }
 
     BOOST_FOREACH(const std::string &key, dev_addr.keys())
@@ -456,6 +458,8 @@ void x300_impl::setup_mb(const size_t mb_i, const uhd::device_addr_t &dev_addr)
                 << "UHD will use the auto-detected max frame size for this connection."
                 << std::endl;
         }
+
+        _tree->create<double>(mb_path / "link_max_rate").set(X300_MAX_RATE_10GIGE);
     }
 
     //create basic communication
@@ -1133,11 +1137,14 @@ x300_impl::both_xports_t x300_impl::make_transport(
         if (mb.loaded_fpga_image == "HGS") {
             if (mb.router_dst_here == X300_XB_DST_E0) {
                 eth_data_rec_frame_size = X300_1GE_DATA_FRAME_MAX_SIZE;
+                _tree->access<double>("/mboards/"+boost::lexical_cast<std::string>(mb_index) / "link_max_rate").set(X300_MAX_RATE_1GIGE);
             } else if (mb.router_dst_here == X300_XB_DST_E1) {
                 eth_data_rec_frame_size = X300_10GE_DATA_FRAME_MAX_SIZE;
+                _tree->access<double>("/mboards/"+boost::lexical_cast<std::string>(mb_index) / "link_max_rate").set(X300_MAX_RATE_10GIGE);
             }
         } else if (mb.loaded_fpga_image == "XGS") {
-                eth_data_rec_frame_size = X300_10GE_DATA_FRAME_MAX_SIZE;
+            eth_data_rec_frame_size = X300_10GE_DATA_FRAME_MAX_SIZE;
+            _tree->access<double>("/mboards/"+boost::lexical_cast<std::string>(mb_index) / "link_max_rate").set(X300_MAX_RATE_10GIGE);
         }
 
         if (eth_data_rec_frame_size == 0) {
diff --git a/host/lib/usrp/x300/x300_impl.hpp b/host/lib/usrp/x300/x300_impl.hpp
index 692427f31..4b3efc845 100644
--- a/host/lib/usrp/x300/x300_impl.hpp
+++ b/host/lib/usrp/x300/x300_impl.hpp
@@ -85,6 +85,10 @@ static const size_t X300_RX_MAX_HDR_LEN             =           // bytes
     + sizeof(uhd::transport::vrt::if_packet_info_t().sid)  // SID
     + sizeof(uhd::transport::vrt::if_packet_info_t().tsf); // Timestamp
 
+static const size_t X300_MAX_RATE_PCIE              = 800000000; // bytes/s
+static const size_t X300_MAX_RATE_10GIGE            = 800000000; // bytes/s
+static const size_t X300_MAX_RATE_1GIGE             = 100000000; // bytes/s
+
 #define X300_RADIO_DEST_PREFIX_TX 0
 #define X300_RADIO_DEST_PREFIX_CTRL 1
 #define X300_RADIO_DEST_PREFIX_RX 2