From 7c9a4a5a41bb981dd4db66e7b479e4e66d488fa5 Mon Sep 17 00:00:00 2001 From: Josh Blum Date: Fri, 19 Jul 2013 13:29:50 -0700 Subject: b100: moved usb wrapper class into b100 impl * since its only used internally in b100 --- host/lib/transport/CMakeLists.txt | 3 +- host/lib/transport/usb_zero_copy_wrapper.cpp | 239 --------------------------- 2 files changed, 1 insertion(+), 241 deletions(-) delete mode 100644 host/lib/transport/usb_zero_copy_wrapper.cpp (limited to 'host/lib/transport') diff --git a/host/lib/transport/CMakeLists.txt b/host/lib/transport/CMakeLists.txt index 4eb7c8c92..963edcf85 100644 --- a/host/lib/transport/CMakeLists.txt +++ b/host/lib/transport/CMakeLists.txt @@ -1,5 +1,5 @@ # -# Copyright 2010-2011 Ettus Research LLC +# Copyright 2010-2013 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 @@ -122,5 +122,4 @@ LIBUHD_APPEND_SOURCES( ${CMAKE_CURRENT_SOURCE_DIR}/buffer_pool.cpp ${CMAKE_CURRENT_SOURCE_DIR}/if_addrs.cpp ${CMAKE_CURRENT_SOURCE_DIR}/udp_simple.cpp - ${CMAKE_CURRENT_SOURCE_DIR}/usb_zero_copy_wrapper.cpp ) diff --git a/host/lib/transport/usb_zero_copy_wrapper.cpp b/host/lib/transport/usb_zero_copy_wrapper.cpp deleted file mode 100644 index ec5667020..000000000 --- a/host/lib/transport/usb_zero_copy_wrapper.cpp +++ /dev/null @@ -1,239 +0,0 @@ -// -// Copyright 2011-2012 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 . -// - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -using namespace uhd; -using namespace uhd::transport; - -static const boost::posix_time::time_duration AUTOFLUSH_TIMEOUT(boost::posix_time::milliseconds(1)); - -/*********************************************************************** - * USB zero copy wrapper - managed receive buffer - **********************************************************************/ -class usb_zero_copy_wrapper_mrb : public managed_recv_buffer{ -public: - usb_zero_copy_wrapper_mrb(void){/*NOP*/} - - void release(void){ - _mrb.reset(); //decrement ref count, other MRB's may hold a ref - _claimer.release(); - } - - UHD_INLINE sptr get_new( - managed_recv_buffer::sptr &mrb, size_t &offset_bytes, - const double timeout, size_t &index - ){ - if (not mrb or not _claimer.claim_with_wait(timeout)) return sptr(); - - index++; //advances the caller's buffer - - //hold a copy of the buffer shared pointer - _mrb = mrb; - - //extract this packet's memory address and length in bytes - char *mem = mrb->cast() + offset_bytes; - const boost::uint32_t *mem32 = reinterpret_cast(mem); - const size_t words32 = (uhd::wtohx(mem32[0]) & 0xffff); //length in words32 (from VRT header) - const size_t len = words32*sizeof(boost::uint32_t); //length in bytes - - //check if this receive buffer has been exhausted - offset_bytes += len; - if (offset_bytes >= mrb->size()) mrb.reset(); //drop caller's ref - else if (uhd::wtohx(mem32[words32]) == 0) mrb.reset(); - - return make(this, mem, len); - } - -private: - managed_recv_buffer::sptr _mrb; - simple_claimer _claimer; -}; - -/*********************************************************************** - * USB zero copy wrapper - managed send buffer - **********************************************************************/ -class usb_zero_copy_wrapper_msb : public managed_send_buffer{ -public: - usb_zero_copy_wrapper_msb(const usb_zero_copy::sptr internal, const size_t fragmentation_size): - _internal(internal), _fragmentation_size(fragmentation_size) - { - _ok_to_auto_flush = false; - _task = uhd::task::make(boost::bind(&usb_zero_copy_wrapper_msb::auto_flush, this)); - } - - ~usb_zero_copy_wrapper_msb(void) - { - //ensure the task has exited before anything auto deconstructs - _task.reset(); - } - - void release(void){ - boost::mutex::scoped_lock lock(_mutex); - _ok_to_auto_flush = true; - - //get a reference to the VITA header before incrementing - const boost::uint32_t vita_header = reinterpret_cast(_mem_buffer_tip)[0]; - - _bytes_in_buffer += size(); - _mem_buffer_tip += size(); - - //extract VITA end of packet flag, we must force flush under eof conditions - const bool eop = (uhd::wtohx(vita_header) & (0x1 << 24)) != 0; - const bool full = _bytes_in_buffer >= (_last_send_buff->size() - _fragmentation_size); - if (eop or full){ - _last_send_buff->commit(_bytes_in_buffer); - _last_send_buff.reset(); - - //notify the auto-flusher to restart its timed_wait - lock.unlock(); _cond.notify_one(); - } - } - - UHD_INLINE sptr get_new(const double timeout){ - boost::mutex::scoped_lock lock(_mutex); - _ok_to_auto_flush = false; - - if (not _last_send_buff){ - _last_send_buff = _internal->get_send_buff(timeout); - if (not _last_send_buff) return sptr(); - _mem_buffer_tip = _last_send_buff->cast(); - _bytes_in_buffer = 0; - } - - return make(this, _mem_buffer_tip, _fragmentation_size); - } - -private: - usb_zero_copy::sptr _internal; - const size_t _fragmentation_size; - managed_send_buffer::sptr _last_send_buff; - size_t _bytes_in_buffer; - char *_mem_buffer_tip; - - //private variables for auto flusher - boost::mutex _mutex; - boost::condition_variable _cond; - uhd::task::sptr _task; - bool _ok_to_auto_flush; - - /*! - * The auto flusher ensures that buffers are force committed when - * the user has not called get_new() within a certain time window. - */ - void auto_flush(void) - { - boost::mutex::scoped_lock lock(_mutex); - const bool timeout = not _cond.timed_wait(lock, AUTOFLUSH_TIMEOUT); - if (timeout and _ok_to_auto_flush and _last_send_buff and _bytes_in_buffer != 0) - { - _last_send_buff->commit(_bytes_in_buffer); - _last_send_buff.reset(); - } - } -}; - -/*********************************************************************** - * USB zero copy wrapper implementation - **********************************************************************/ -class usb_zero_copy_wrapper : public usb_zero_copy{ -public: - usb_zero_copy_wrapper(sptr usb_zc, const size_t frame_boundary): - _internal_zc(usb_zc), - _frame_boundary(frame_boundary), - _next_recv_buff_index(0) - { - for (size_t i = 0; i < this->get_num_recv_frames(); i++){ - _mrb_pool.push_back(boost::make_shared()); - } - _the_only_msb = boost::make_shared(usb_zc, frame_boundary); - } - - managed_recv_buffer::sptr get_recv_buff(double timeout){ - //lazy flush mechanism - negative timeout - if (timeout < 0.0) - { - _last_recv_buff.reset(); - while (_internal_zc->get_recv_buff()){} - return managed_recv_buffer::sptr(); - } - - //attempt to get a managed recv buffer - if (not _last_recv_buff){ - _last_recv_buff = _internal_zc->get_recv_buff(timeout); - _last_recv_offset = 0; //reset offset into buffer - } - - //get the buffer to be returned to the user - if (_next_recv_buff_index == _mrb_pool.size()) _next_recv_buff_index = 0; - return _mrb_pool[_next_recv_buff_index]->get_new( - _last_recv_buff, _last_recv_offset, timeout, _next_recv_buff_index - ); - } - - size_t get_num_recv_frames(void) const{ - return _internal_zc->get_num_recv_frames(); - } - - size_t get_recv_frame_size(void) const{ - return std::min(_frame_boundary, _internal_zc->get_recv_frame_size()); - } - - managed_send_buffer::sptr get_send_buff(double timeout){ - return _the_only_msb->get_new(timeout); - } - - size_t get_num_send_frames(void) const{ - return _internal_zc->get_num_send_frames(); - } - - size_t get_send_frame_size(void) const{ - return std::min(_frame_boundary, _internal_zc->get_send_frame_size()); - } - -private: - sptr _internal_zc; - size_t _frame_boundary; - std::vector > _mrb_pool; - boost::shared_ptr _the_only_msb; - - //state for last recv buffer to create multiple managed buffers - managed_recv_buffer::sptr _last_recv_buff; - size_t _last_recv_offset; - size_t _next_recv_buff_index; -}; - -/*********************************************************************** - * USB zero copy wrapper factory function - **********************************************************************/ -usb_zero_copy::sptr usb_zero_copy::make_wrapper( - sptr usb_zc, size_t usb_frame_boundary -){ - return sptr(new usb_zero_copy_wrapper(usb_zc, usb_frame_boundary)); -} -- cgit v1.2.3