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-rw-r--r--host/include/uhd/device.hpp11
-rw-r--r--host/include/uhd/transport/udp_simple.hpp4
-rw-r--r--host/include/uhd/transport/udp_zero_copy.hpp4
-rw-r--r--host/lib/transport/udp_simple.cpp29
-rw-r--r--host/lib/transport/udp_zero_copy_none.cpp39
-rw-r--r--host/lib/usrp/usrp2/dsp_impl.cpp9
-rw-r--r--host/lib/usrp/usrp2/io_impl.cpp14
-rw-r--r--host/lib/usrp/usrp2/usrp2_impl.cpp39
8 files changed, 104 insertions, 45 deletions
diff --git a/host/include/uhd/device.hpp b/host/include/uhd/device.hpp
index 1a52867c9..47dfa4328 100644
--- a/host/include/uhd/device.hpp
+++ b/host/include/uhd/device.hpp
@@ -77,6 +77,9 @@ public:
* It is up to the caller to call send again on the un-sent
* portions of the buffer, until the buffer is exhausted.
*
+ * This is a blocking call and will not return until the number
+ * of samples returned have been read out of the buffer.
+ *
* \param buff a buffer pointing to some read-only memory
* \param metadata data describing the buffer's contents
* \param the type of data loaded in the buffer (32fc, 16sc)
@@ -101,6 +104,14 @@ public:
* The next call to receive, after the remainder becomes exahausted,
* will perform an over-the-wire receive as usual.
*
+ * This is a blocking call and will not return until the number
+ * of samples returned have been written into the buffer.
+ * However, a call to receive may timeout and return zero samples.
+ * The timeout duration is decided by the underlying transport layer.
+ * The caller should assume that the call to receive will not return
+ * immediately when no packets are available to the transport layer,
+ * and that the timeout duration is reasonably tuned for performance.
+ *
* \param buff the buffer to fill with IF data
* \param metadata data to fill describing the buffer
* \param the type of data to fill into the buffer (32fc, 16sc)
diff --git a/host/include/uhd/transport/udp_simple.hpp b/host/include/uhd/transport/udp_simple.hpp
index 8663128ec..0d8fcc5f0 100644
--- a/host/include/uhd/transport/udp_simple.hpp
+++ b/host/include/uhd/transport/udp_simple.hpp
@@ -67,9 +67,9 @@ public:
/*!
* Receive into the provided buffer.
- * Returns empty when data is not available.
+ * Blocks until data is received or a timeout occurs.
* \param buff a mutable buffer to receive into
- * \return the number of bytes received.
+ * \return the number of bytes received or zero on timeout
*/
virtual size_t recv(const boost::asio::mutable_buffer &buff) = 0;
};
diff --git a/host/include/uhd/transport/udp_zero_copy.hpp b/host/include/uhd/transport/udp_zero_copy.hpp
index 9c3505dd6..1a8d822fd 100644
--- a/host/include/uhd/transport/udp_zero_copy.hpp
+++ b/host/include/uhd/transport/udp_zero_copy.hpp
@@ -64,9 +64,9 @@ public:
/*!
* Receive a buffer.
+ * Blocks until data is received or a timeout occurs.
* The memory is managed by the implementation.
- * Returns an empty buffer when data is not available.
- * \return a smart buffer with memory and size
+ * \return a smart buffer (empty on timeout)
*/
virtual smart_buffer::sptr recv(void) = 0;
};
diff --git a/host/lib/transport/udp_simple.cpp b/host/lib/transport/udp_simple.cpp
index 491cf59db..7004bdfdf 100644
--- a/host/lib/transport/udp_simple.cpp
+++ b/host/lib/transport/udp_simple.cpp
@@ -16,12 +16,35 @@
//
#include <uhd/transport/udp_simple.hpp>
+#include <boost/thread.hpp>
#include <boost/format.hpp>
#include <iostream>
using namespace uhd::transport;
/***********************************************************************
+ * Helper Functions
+ **********************************************************************/
+/*!
+ * A receive timeout for a socket:
+ *
+ * It seems that asio cannot have timeouts with synchronous io.
+ * However, we can implement a polling loop that will timeout.
+ * This is okay bacause this is the slow-path implementation.
+ *
+ * \param socket the asio socket
+ */
+static void reasonable_recv_timeout(
+ boost::asio::ip::udp::socket &socket
+){
+ boost::asio::deadline_timer timer(socket.get_io_service());
+ timer.expires_from_now(boost::posix_time::milliseconds(50));
+ while (not (socket.available() or timer.expires_from_now().is_negative())){
+ boost::this_thread::sleep(boost::posix_time::milliseconds(1));
+ }
+}
+
+/***********************************************************************
* UDP connected implementation class
**********************************************************************/
class udp_connected_impl : public udp_simple{
@@ -62,7 +85,8 @@ size_t udp_connected_impl::send(const boost::asio::const_buffer &buff){
}
size_t udp_connected_impl::recv(const boost::asio::mutable_buffer &buff){
- if (_socket->available() == 0) return 0;
+ reasonable_recv_timeout(*_socket);
+ if (not _socket->available()) return 0;
return _socket->receive(boost::asio::buffer(buff));
}
@@ -112,7 +136,8 @@ size_t udp_broadcast_impl::send(const boost::asio::const_buffer &buff){
}
size_t udp_broadcast_impl::recv(const boost::asio::mutable_buffer &buff){
- if (_socket->available() == 0) return 0;
+ reasonable_recv_timeout(*_socket);
+ if (not _socket->available()) return 0;
boost::asio::ip::udp::endpoint sender_endpoint;
return _socket->receive_from(boost::asio::buffer(buff), sender_endpoint);
}
diff --git a/host/lib/transport/udp_zero_copy_none.cpp b/host/lib/transport/udp_zero_copy_none.cpp
index e95706d94..e29530cf1 100644
--- a/host/lib/transport/udp_zero_copy_none.cpp
+++ b/host/lib/transport/udp_zero_copy_none.cpp
@@ -16,6 +16,8 @@
//
#include <uhd/transport/udp_zero_copy.hpp>
+#include <boost/thread.hpp>
+#include <boost/format.hpp>
using namespace uhd::transport;
@@ -67,6 +69,9 @@ public:
private:
boost::asio::ip::udp::socket *_socket;
boost::asio::io_service _io_service;
+
+ size_t get_recv_buff_size(void);
+ void set_recv_buff_size(size_t);
};
udp_zero_copy_impl::udp_zero_copy_impl(const std::string &addr, const std::string &port){
@@ -81,6 +86,18 @@ udp_zero_copy_impl::udp_zero_copy_impl(const std::string &addr, const std::strin
_socket = new boost::asio::ip::udp::socket(_io_service);
_socket->open(boost::asio::ip::udp::v4());
_socket->connect(receiver_endpoint);
+
+ // set the rx socket buffer size:
+ // pick a huge size, and deal with whatever we get
+ set_recv_buff_size(54321e3); //some big number!
+ size_t current_buff_size = get_recv_buff_size();
+ std::cout << boost::format(
+ "Current rx socket buffer size: %d\n"
+ ) % current_buff_size;
+ if (current_buff_size < .1e6) std::cout << boost::format(
+ "Adjust max rx socket buffer size (linux only):\n"
+ " sysctl -w net.core.rmem_max=VALUE\n"
+ );
}
udp_zero_copy_impl::~udp_zero_copy_impl(void){
@@ -92,14 +109,21 @@ size_t udp_zero_copy_impl::send(const boost::asio::const_buffer &buff){
}
smart_buffer::sptr udp_zero_copy_impl::recv(void){
- size_t available = _socket->available();
+ size_t available = 0;
+
+ //implement timeout through polling and sleeping
+ boost::asio::deadline_timer timer(_socket->get_io_service());
+ timer.expires_from_now(boost::posix_time::milliseconds(50));
+ while (not ((available = _socket->available()) or timer.expires_from_now().is_negative())){
+ boost::this_thread::sleep(boost::posix_time::milliseconds(1));
+ }
//allocate memory and create buffer
uint32_t *buff_mem = new uint32_t[available/sizeof(uint32_t)];
boost::asio::mutable_buffer buff(buff_mem, available);
//receive only if data is available
- if (available > 0){
+ if (available){
_socket->receive(boost::asio::buffer(buff));
}
@@ -107,6 +131,17 @@ smart_buffer::sptr udp_zero_copy_impl::recv(void){
return smart_buffer::sptr(new smart_buffer_impl(buff));
}
+size_t udp_zero_copy_impl::get_recv_buff_size(void){
+ boost::asio::socket_base::receive_buffer_size option;
+ _socket->get_option(option);
+ return option.value();
+}
+
+void udp_zero_copy_impl::set_recv_buff_size(size_t new_size){
+ boost::asio::socket_base::receive_buffer_size option(new_size);
+ _socket->set_option(option);
+}
+
/***********************************************************************
* UDP zero copy make function
**********************************************************************/
diff --git a/host/lib/usrp/usrp2/dsp_impl.cpp b/host/lib/usrp/usrp2/dsp_impl.cpp
index a32f68872..7831b7667 100644
--- a/host/lib/usrp/usrp2/dsp_impl.cpp
+++ b/host/lib/usrp/usrp2/dsp_impl.cpp
@@ -21,6 +21,9 @@
using namespace uhd;
+static const size_t default_decim = 16;
+static const size_t default_interp = 16;
+
/***********************************************************************
* DDC Helper Methods
**********************************************************************/
@@ -37,7 +40,7 @@ static uint32_t calculate_freq_word_and_update_actual_freq(freq_t &freq, freq_t
}
static uint32_t calculate_iq_scale_word(int16_t i, int16_t q){
- return ((i & 0xffff) << 16) | ((q & 0xffff) << 0);
+ return (uint16_t(i) << 16) | (uint16_t(q) << 0);
}
void usrp2_impl::init_ddc_config(void){
@@ -48,7 +51,7 @@ void usrp2_impl::init_ddc_config(void){
);
//initial config and update
- _ddc_decim = 64;
+ _ddc_decim = default_decim;
_ddc_freq = 0;
update_ddc_config();
@@ -196,7 +199,7 @@ void usrp2_impl::init_duc_config(void){
);
//initial config and update
- _duc_interp = 64;
+ _duc_interp = default_interp;
_duc_freq = 0;
update_duc_config();
}
diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp
index 6273846dc..cc7746720 100644
--- a/host/lib/usrp/usrp2/io_impl.cpp
+++ b/host/lib/usrp/usrp2/io_impl.cpp
@@ -71,9 +71,9 @@ static inline void host_floats_to_usrp2_items(
size_t num_samps
){
unrolled_loop(i, num_samps,{
- int16_t real = host_floats[i].real()*shorts_per_float;
- int16_t imag = host_floats[i].imag()*shorts_per_float;
- usrp2_items[i] = htonl(((real << 16) & 0xffff) | ((imag << 0) & 0xffff));
+ uint16_t real = host_floats[i].real()*shorts_per_float;
+ uint16_t imag = host_floats[i].imag()*shorts_per_float;
+ usrp2_items[i] = htonl((real << 16) | (imag << 0));
});
}
@@ -84,8 +84,8 @@ static inline void usrp2_items_to_host_floats(
){
unrolled_loop(i, num_samps,{
uint32_t item = ntohl(usrp2_items[i]);
- int16_t real = (item >> 16) & 0xffff;
- int16_t imag = (item >> 0) & 0xffff;
+ int16_t real = item >> 16;
+ int16_t imag = item >> 0;
host_floats[i] = fc32_t(real*floats_per_short, imag*floats_per_short);
});
}
@@ -130,9 +130,7 @@ void usrp2_impl::recv_raw(rx_metadata_t &metadata){
return; //must exit here after setting the buffer
}
const uint32_t *vrt_hdr = asio::buffer_cast<const uint32_t *>(_rx_smart_buff->get());
- size_t num_header_words32_out;
- size_t num_payload_words32_out;
- size_t packet_count_out;
+ size_t num_header_words32_out, num_payload_words32_out, packet_count_out;
try{
vrt::unpack(
metadata, //output
diff --git a/host/lib/usrp/usrp2/usrp2_impl.cpp b/host/lib/usrp/usrp2/usrp2_impl.cpp
index 752feb05b..58c82303f 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.cpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.cpp
@@ -24,6 +24,7 @@
using namespace uhd;
using namespace uhd::usrp;
using namespace uhd::transport;
+namespace asio = boost::asio;
/***********************************************************************
* Discovery over the udp transport
@@ -43,19 +44,12 @@ uhd::device_addrs_t usrp2::discover(const device_addr_t &hint){
ctrl_data_out.id = htonl(USRP2_CTRL_ID_GIVE_ME_YOUR_IP_ADDR_BRO);
udp_transport->send(boost::asio::buffer(&ctrl_data_out, sizeof(ctrl_data_out)));
- //loop and recieve until the time is up
- size_t num_timeouts = 0;
+ //loop and recieve until the timeout
while(true){
usrp2_ctrl_data_t ctrl_data_in;
- size_t len = udp_transport->recv(
- boost::asio::buffer(&ctrl_data_in, sizeof(ctrl_data_in))
- );
+ size_t len = udp_transport->recv(asio::buffer(&ctrl_data_in, sizeof(ctrl_data_in)));
//std::cout << len << "\n";
- if (len < sizeof(usrp2_ctrl_data_t)){
- //sleep a little so we dont burn cpu
- if (num_timeouts++ > 50) break;
- boost::this_thread::sleep(boost::posix_time::milliseconds(1));
- }else{
+ if (len >= sizeof(usrp2_ctrl_data_t)){
//handle the received data
switch(ntohl(ctrl_data_in.id)){
case USRP2_CTRL_ID_THIS_IS_MY_IP_ADDR_DUDE:
@@ -67,9 +61,11 @@ uhd::device_addrs_t usrp2::discover(const device_addr_t &hint){
new_addr["transport"] = "udp";
new_addr["addr"] = ip_addr.to_string();
usrp2_addrs.push_back(new_addr);
- break;
+ //dont break here, it will exit the while loop
+ //just continue on to the next loop iteration
}
}
+ if (len == 0) break; //timeout
}
return usrp2_addrs;
@@ -164,24 +160,15 @@ usrp2_ctrl_data_t usrp2_impl::ctrl_send_and_recv(const usrp2_ctrl_data_t &out_da
out_copy.seq = htonl(++_ctrl_seq_num);
_ctrl_transport->send(boost::asio::buffer(&out_copy, sizeof(usrp2_ctrl_data_t)));
- //loop and recieve until the time is up
- size_t num_timeouts = 0;
+ //loop until we get the packet or timeout
while(true){
usrp2_ctrl_data_t in_data;
- size_t len = _ctrl_transport->recv(
- boost::asio::buffer(&in_data, sizeof(in_data))
- );
- if (len < sizeof(usrp2_ctrl_data_t)){
- //sleep a little so we dont burn cpu
- if (num_timeouts++ > 50) break;
- boost::this_thread::sleep(boost::posix_time::milliseconds(1));
- }else{
- //handle the received data
- if (ntohl(in_data.seq) == _ctrl_seq_num){
- return in_data;
- }
- //didnt get seq, continue on...
+ size_t len = _ctrl_transport->recv(asio::buffer(&in_data, sizeof(in_data)));
+ if (len >= sizeof(usrp2_ctrl_data_t) and ntohl(in_data.seq) == _ctrl_seq_num){
+ return in_data;
}
+ if (len == 0) break; //timeout
+ //didnt get seq or bad packet, continue looking...
}
throw std::runtime_error("usrp2 no control response");
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 17:48:33 +0000