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//
// Copyright 2019 Ettus Research, a National Instruments Brand
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include <uhdlib/rfnoc/chdr_packet.hpp>
#include <cassert>
#include <functional>
#include <memory>
using namespace uhd;
using namespace uhd::rfnoc;
using namespace uhd::rfnoc::chdr;
chdr_packet::~chdr_packet() = default;
//------------------------------------------------------------
// chdr_packet
//------------------------------------------------------------
// endianness is the link endianness, not the host endianness
template <size_t chdr_w, endianness_t endianness>
class chdr_packet_impl : public chdr_packet
{
public:
chdr_packet_impl() = delete;
chdr_packet_impl(size_t mtu_bytes) : _mtu_bytes(mtu_bytes) {}
~chdr_packet_impl() = default;
virtual void refresh(const void* pkt_buff) const
{
assert(pkt_buff);
_pkt_buff = const_cast<uint64_t*>(reinterpret_cast<const uint64_t*>(pkt_buff));
_mdata_offset = _compute_mdata_offset(get_chdr_header());
}
virtual void refresh(void* pkt_buff, chdr_header& header, uint64_t timestamp = 0)
{
assert(pkt_buff);
_pkt_buff = reinterpret_cast<uint64_t*>(pkt_buff);
_pkt_buff[0] = u64_from_host(header);
if (_has_timestamp(header)) {
_pkt_buff[1] = u64_from_host(timestamp);
}
_mdata_offset = _compute_mdata_offset(get_chdr_header());
}
virtual void update_payload_size(size_t payload_size_bytes)
{
chdr_header header = get_chdr_header();
header.set_length(((_mdata_offset + header.get_num_mdata()) * chdr_w_bytes)
+ payload_size_bytes);
_pkt_buff[0] = u64_from_host(header);
}
virtual endianness_t get_byte_order() const
{
return endianness;
}
virtual size_t get_mtu_bytes() const
{
return _mtu_bytes;
}
virtual chdr_header get_chdr_header() const
{
assert(_pkt_buff);
return std::move(chdr_header(u64_to_host(_pkt_buff[0])));
}
virtual boost::optional<uint64_t> get_timestamp() const
{
if (_has_timestamp(get_chdr_header())) {
// In a unit64_t buffer, the timestamp is always immediately after the header
// regardless of chdr_w.
return u64_to_host(_pkt_buff[1]);
} else {
return boost::none;
}
}
virtual size_t get_mdata_size() const
{
return get_chdr_header().get_num_mdata() * chdr_w_bytes;
}
virtual const void* get_mdata_const_ptr() const
{
return const_cast<void*>(
const_cast<chdr_packet_impl<chdr_w, endianness>*>(this)->get_mdata_ptr());
}
virtual void* get_mdata_ptr()
{
return reinterpret_cast<void*>(_pkt_buff + (chdr_w_stride * _mdata_offset));
}
virtual size_t get_payload_size() const
{
return get_chdr_header().get_length() - get_mdata_size()
- (chdr_w_bytes * _mdata_offset);
}
virtual const void* get_payload_const_ptr() const
{
return const_cast<void*>(
const_cast<chdr_packet_impl<chdr_w, endianness>*>(this)->get_payload_ptr());
}
virtual void* get_payload_ptr()
{
return reinterpret_cast<void*>(
_pkt_buff
+ (chdr_w_stride * (_mdata_offset + get_chdr_header().get_num_mdata())));
}
virtual size_t calculate_payload_offset(const packet_type_t pkt_type,
const uint8_t num_mdata = 0) const
{
chdr_header header;
header.set_pkt_type(pkt_type);
return (_compute_mdata_offset(header) + num_mdata) * chdr_w_bytes;
}
private:
inline bool _has_timestamp(const chdr_header& header) const
{
return (header.get_pkt_type() == PKT_TYPE_DATA_WITH_TS);
}
inline size_t _compute_mdata_offset(const chdr_header& header) const
{
// The metadata offset depends on the chdr_w and whether we have a timestamp
if (chdr_w == 64) {
return _has_timestamp(header) ? 2 : 1;
} else {
return 1;
}
}
inline static uint64_t u64_to_host(uint64_t word)
{
return (endianness == ENDIANNESS_BIG) ? uhd::ntohx<uint64_t>(word)
: uhd::wtohx<uint64_t>(word);
}
inline static uint64_t u64_from_host(uint64_t word)
{
return (endianness == ENDIANNESS_BIG) ? uhd::htonx<uint64_t>(word)
: uhd::htowx<uint64_t>(word);
}
static const size_t chdr_w_bytes = (chdr_w / 8);
static const size_t chdr_w_stride = (chdr_w / 64);
// Packet state
const size_t _mtu_bytes = 0;
mutable uint64_t* _pkt_buff = nullptr;
mutable size_t _mdata_offset = 0;
};
chdr_packet_factory::chdr_packet_factory(chdr_w_t chdr_w, endianness_t endianness)
: _chdr_w(chdr_w), _endianness(endianness)
{
}
chdr_packet::uptr chdr_packet_factory::make_generic(size_t mtu_bytes) const
{
if (_endianness == ENDIANNESS_BIG) {
switch (_chdr_w) {
case CHDR_W_512:
return std::make_unique<chdr_packet_impl<512, ENDIANNESS_BIG>>(mtu_bytes);
case CHDR_W_256:
return std::make_unique<chdr_packet_impl<256, ENDIANNESS_BIG>>(mtu_bytes);
case CHDR_W_128:
return std::make_unique<chdr_packet_impl<128, ENDIANNESS_BIG>>(mtu_bytes);
case CHDR_W_64:
return std::make_unique<chdr_packet_impl<64, ENDIANNESS_BIG>>(mtu_bytes);
default:
assert(0);
}
} else {
switch (_chdr_w) {
case CHDR_W_512:
return std::make_unique<chdr_packet_impl<512, ENDIANNESS_LITTLE>>(
mtu_bytes);
case CHDR_W_256:
return std::make_unique<chdr_packet_impl<256, ENDIANNESS_LITTLE>>(
mtu_bytes);
case CHDR_W_128:
return std::make_unique<chdr_packet_impl<128, ENDIANNESS_LITTLE>>(
mtu_bytes);
case CHDR_W_64:
return std::make_unique<chdr_packet_impl<64, ENDIANNESS_LITTLE>>(
mtu_bytes);
default:
assert(0);
}
}
return chdr_packet::uptr();
}
chdr_ctrl_packet::uptr chdr_packet_factory::make_ctrl(size_t mtu_bytes) const
{
return std::make_unique<chdr_ctrl_packet>(make_generic(mtu_bytes));
}
chdr_strs_packet::uptr chdr_packet_factory::make_strs(size_t mtu_bytes) const
{
return std::make_unique<chdr_strs_packet>(make_generic(mtu_bytes));
}
chdr_strc_packet::uptr chdr_packet_factory::make_strc(size_t mtu_bytes) const
{
return std::make_unique<chdr_strc_packet>(make_generic(mtu_bytes));
}
chdr_mgmt_packet::uptr chdr_packet_factory::make_mgmt(size_t mtu_bytes) const
{
return std::make_unique<chdr_mgmt_packet>(make_generic(mtu_bytes));
}
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