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litespeed-quic/test/unittests/test_ackparse_gquic_be.c
Dmitri Tikhonov c51ce3387f Latest changes 
- [API Change] Sendfile-like functionality is gone.  The stream no
  longer opens files and deals with file descriptors.  (Among other
  things, this makes the code more portable.)  Three writing functions
  are provided:

    lsquic_stream_write
    lsquic_stream_writev
    lsquic_stream_writef    (NEW)

  lsquic_stream_writef() is given an abstract reader that has function
  pointers for size() and read() functions which the user can implement.
  This is the most flexible way.  lsquic_stream_write() and
  lsquic_stream_writev() are now both implemented as wrappers around
  lsquic_stream_writef().

- [OPTIMIZATION] When writing to stream, be it within or without the
  on_write() callback, place data directly into packet buffer,
  bypassing auxiliary data structures.  This reduces amount of memory
  required, for the amount of data that can be written is limited
  by the congestion window.

  To support writes outside the on_write() callback, we keep N
  outgoing packet buffers per connection which can be written to
  by any stream.  One half of these are reserved for the highest
  priority stream(s), the other half for all other streams.  This way,
  low-priority streams cannot write instead of high-priority streams
  and, on the other hand, low-priority streams get a chance to send
  their packets out.

  The algorithm is as follows:

  - When user writes to stream outside of the callback:
    - If this is the highest priority stream, place it onto the
      reserved N/2 queue or fail.
        (The actual size of this queue is dynamic -- MAX(N/2, CWND) --
         rather than N/2, allowing high-priority streams to write as
         much as can be sent.)
    - If the stream is not the highest priority, try to place the
      data onto the reserved N/2 queue or fail.
  - When tick occurs *and* more packets can be scheduled:
    - Transfer packets from the high N/2 queue to the scheduled
      queue.
    - If more scheduling is allowed:
      - Call on_write callbacks for highest-priority streams,
        placing resulting packets directly onto the scheduled queue.
    - If more scheduling is allowed:
      - Transfer packets from the low N/2 queue to the scheduled
        queue.
    - If more scheduling is allowed:
      - Call on_write callbacks for non-highest-priority streams,
        placing resulting packets directly onto the scheduled queue

  The number N is currently 20, but it could be varied based on
  resource usage.

- If stream is created due to incoming headers, make headers readable
  from on_new.

- Outgoing packets are no longer marked non-writeable to prevent placing
  more than one STREAM frame from the same stream into a single packet.
  This property is maintained via code flow and an explicit check.
  Packets for stream data are allocated using a special function.

- STREAM frame elision is cheaper, as we only perform it if a reset
  stream has outgoing packets referencing it.

- lsquic_packet_out_t is smaller, as stream_rec elements are now
  inside a union.
2017-10-31 09:35:58 -04:00

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/* Copyright (c) 2017 LiteSpeed Technologies Inc. See LICENSE. */
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include "lsquic_types.h"
#include "lsquic_parse.h"
#include "lsquic_rechist.h"
#include "lsquic_util.h"
#include "lsquic.h"
static const struct parse_funcs *const pf = select_pf_by_ver(LSQVER_039);
static lsquic_packno_t
n_acked (const ack_info_t *acki)
{
lsquic_packno_t n = 0;
unsigned i;
for (i = 0; i < acki->n_ranges; ++i)
n += acki->ranges[i].high - acki->ranges[i].low + 1;
return n;
}
static void
test1 (void)
{
/* Test taken from quic_framer_test.cc -- NewAckFrameOneAckBlock */
unsigned char ack_buf[] = {
0x45,
0x12, 0x34, /* Largest acked */
0x00, 0x00, /* Delta time */
0x12, 0x34, /* Block length */
0x00, /* Number of timestamps */
};
ack_info_t acki;
memset(&acki, 0xF1, sizeof(acki));
int len = pf->pf_parse_ack_frame(ack_buf, sizeof(ack_buf), &acki);
assert(("Parsed length is correct (8)", len == sizeof(ack_buf)));
assert(("Number of ranges is 1", acki.n_ranges == 1));
assert(("Largest acked is 0x1234", acki.ranges[0].high == 0x1234));
assert(("Lowest acked is 1", acki.ranges[0].low == 1));
assert(("Number of timestamps is 0", acki.n_timestamps == 0));
unsigned n = n_acked(&acki);
assert(("Number of acked packets is 0x1234", n == 0x1234));
lsquic_packno_t ack_high = pf->pf_parse_ack_high(ack_buf, sizeof(ack_buf));
assert(0x1234 == ack_high);
{
size_t sz;
for (sz = 1; sz < sizeof(ack_buf); ++sz)
{
len = pf->pf_parse_ack_frame(ack_buf, sz, &acki);
assert(("Parsing truncated frame failed", len < 0));
}
}
}
static void
test2 (void)
{
/* Test taken from quic_framer_test.cc -- NewAckFrameOneAckBlock */
unsigned char ack_buf[] = {
0x65,
0x12, 0x34, /* Largest acked */
0x00, 0x00, /* Zero delta time. */
0x04, /* Num ack blocks ranges. */
0x00, 0x01, /* First ack block length. */
0x01, /* Gap to next block. */
0x0e, 0xaf, /* Ack block length. */
0xff, /* Gap to next block. */
0x00, 0x00, /* Ack block length. */
0x91, /* Gap to next block. */
0x01, 0xea, /* Ack block length. */
0x05, /* Gap to next block. */
0x00, 0x04, /* Ack block length. */
0x02, /* Number of timestamps. */
0x01, /* Delta from largest observed. */
0x10, 0x32, 0x54, 0x76, /* Delta time. */ /* XXX do we use this at all? */
0x02, /* Delta from largest observed. */
0x10, 0x32, /* Delta time. */
};
/* We should get the following array of ranges:
* high low
* 0x1234 0x1234
* 0x1232 0x384
* 0x1F3 0xA
* 0x4 0x1
*/
static const struct { unsigned high, low; } ranges[] = {
{ 0x1234, 0x1234 },
{ 0x1232, 0x384 },
{ 0x1F3, 0xA },
{ 0x4, 0x1 },
};
ack_info_t acki;
memset(&acki, 0xF1, sizeof(acki));
int len = pf->pf_parse_ack_frame(ack_buf, sizeof(ack_buf), &acki);
assert(("Parsed length is correct (29)", len == sizeof(ack_buf)));
assert(("Number of ranges is 4", acki.n_ranges == 4));
assert(("Largest acked is 0x1234", acki.ranges[0].high == 0x1234));
assert(("Number of timestamps is 2", acki.n_timestamps == 2));
unsigned n = n_acked(&acki);
assert(("Number of acked packets is 4254", n == 4254));
lsquic_packno_t ack_high = pf->pf_parse_ack_high(ack_buf, sizeof(ack_buf));
assert(0x1234 == ack_high);
for (n = 0; n < 4; ++n)
assert(("Range checks out", ranges[n].high == acki.ranges[n].high
&& ranges[n].low == acki.ranges[n].low));
{
size_t sz;
for (sz = 1; sz < sizeof(ack_buf); ++sz)
{
len = pf->pf_parse_ack_frame(ack_buf, sz, &acki);
assert(("Parsing truncated frame failed", len < 0));
}
}
}
static void
test3 (void)
{
/* Generated by our own code, but failed to parse... */
unsigned char ack_buf[] = {
0x60, /* More than one ack block, 1 byte largest observed, 1 byte block length */
0x06, /* Largest ACKed */
0x00, 0x00, /* Delta time */
0x01, /* Num ACK block ranges */
0x01, /* First ACK block length */
0x02, /* Gap to next block */
0x03, /* Ack block length */
0x00 /* Number of timestamps */
};
/* We should get the following array of ranges:
* high low
* 6 6
* 3 1
*/
static const struct { unsigned high, low; } ranges[] = {
{ 6, 6, },
{ 3, 1, },
};
ack_info_t acki;
memset(&acki, 0xF1, sizeof(acki));
int len = pf->pf_parse_ack_frame(ack_buf, sizeof(ack_buf), &acki);
assert(("Parsed length is correct (9)", len == sizeof(ack_buf)));
assert(("Number of ranges is 2", acki.n_ranges == 2));
assert(("Largest acked is 6", acki.ranges[0].high == 6));
assert(("Number of timestamps is 0", acki.n_timestamps == 0));
unsigned n = n_acked(&acki);
assert(("Number of acked packets is 4", n == 4));
lsquic_packno_t ack_high = pf->pf_parse_ack_high(ack_buf, sizeof(ack_buf));
assert(6 == ack_high);
for (n = 0; n < 2; ++n)
assert(("Range checks out", ranges[n].high == acki.ranges[n].high
&& ranges[n].low == acki.ranges[n].low));
{
size_t sz;
for (sz = 1; sz < sizeof(ack_buf); ++sz)
{
len = pf->pf_parse_ack_frame(ack_buf, sz, &acki);
assert(("Parsing truncated frame failed", len < 0));
}
}
}
static void
test4 (void)
{
unsigned char ack_buf[] = {
0x60, /* More than one ack block, 1 byte largest observed, 1 byte block length */
0x03, /* Largest ACKed */
0x23, 0x00, /* Delta time */
0x01, /* Num ACK block ranges */
0x01, /* First ack block length */
0x01, /* Gap */
0x01, /* Ack block length */
0x00, /* Number of timestamps */
};
/* We should get the following array of ranges:
* high low
* 6 6
* 3 1
*/
static const struct { unsigned high, low; } ranges[] = {
{ 3, 3, },
{ 1, 1, },
};
ack_info_t acki;
memset(&acki, 0xF1, sizeof(acki));
int len = pf->pf_parse_ack_frame(ack_buf, sizeof(ack_buf), &acki);
assert(("Parsed length is correct (9)", len == sizeof(ack_buf)));
assert(("Number of ranges is 2", acki.n_ranges == 2));
assert(("Largest acked is 3", acki.ranges[0].high == 3));
assert(("Number of timestamps is 0", acki.n_timestamps == 0));
unsigned n = n_acked(&acki);
assert(("Number of acked packets is 2", n == 2));
lsquic_packno_t ack_high = pf->pf_parse_ack_high(ack_buf, sizeof(ack_buf));
assert(3 == ack_high);
for (n = 0; n < 2; ++n)
assert(("Range checks out", ranges[n].high == acki.ranges[n].high
&& ranges[n].low == acki.ranges[n].low));
{
size_t sz;
for (sz = 1; sz < sizeof(ack_buf); ++sz)
{
len = pf->pf_parse_ack_frame(ack_buf, sz, &acki);
assert(("Parsing truncated frame failed", len < 0));
}
}
}
/* Four-byte packet numbers */
static void
test5 (void)
{
unsigned char ack_buf[] = {
0x60
| (2 << 2) /* Four-byte largest acked */
| (2 << 0) /* Four-byte ACK block length */
,
0x23, 0x45, 0x67, 0x89,
0x00, 0x00, /* Zero delta time. */
0x01, /* Num ack blocks ranges. */
0x00, 0x00, 0x00, 0x01, /* First ack block length. */
33 - 1, /* Gap to next block. */
0x23, 0x45, 0x67, 0x68, /* Ack block length. */
0x00, /* Number of timestamps. */
};
/* We should get the following array of ranges:
* high low
* 6 6
* 3 1
*/
static const struct { unsigned high, low; } ranges[] = {
{ 0x23456789, 0x23456789, },
{ 0x23456768, 1, },
};
ack_info_t acki;
memset(&acki, 0xF1, sizeof(acki));
int len = pf->pf_parse_ack_frame(ack_buf, sizeof(ack_buf), &acki);
assert(("Parsed length is correct (9)", len == sizeof(ack_buf)));
assert(("Number of ranges is 2", acki.n_ranges == 2));
assert(("Largest acked is 0x23456789", acki.ranges[0].high == 0x23456789));
assert(("Number of timestamps is 0", acki.n_timestamps == 0));
lsquic_packno_t n = n_acked(&acki);
assert(("Number of acked packets is correct", n == 0x23456768 + 1));
for (n = 0; n < 2; ++n)
assert(("Range checks out", ranges[n].high == acki.ranges[n].high
&& ranges[n].low == acki.ranges[n].low));
{
size_t sz;
for (sz = 1; sz < sizeof(ack_buf); ++sz)
{
len = pf->pf_parse_ack_frame(ack_buf, sz, &acki);
assert(("Parsing truncated frame failed", len < 0));
}
}
}
/* Six-byte packet numbers */
static void
test6 (void)
{
unsigned char ack_buf[] = {
0x60
| (3 << 2) /* Six-byte largest acked */
| (3 << 0) /* Six-byte ACK block length */
,
0xAB, 0xCD, 0x23, 0x45, 0x67, 0x89,
0x00, 0x00, /* Zero delta time. */
0x01, /* Num ack blocks ranges. */
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, /* First ack block length. */
33 - 1, /* Gap to next block. */
0xAB, 0xCD, 0x23, 0x45, 0x67, 0x68, /* Ack block length. */
0x00, /* Number of timestamps. */
};
static const struct { lsquic_packno_t high, low; } ranges[] = {
{ 0xABCD23456789, 0xABCD23456789, },
{ 0xABCD23456768, 1, },
};
ack_info_t acki;
memset(&acki, 0xF1, sizeof(acki));
int len = pf->pf_parse_ack_frame(ack_buf, sizeof(ack_buf), &acki);
assert(("Parsed length is correct", len == sizeof(ack_buf)));
assert(("Number of ranges is 2", acki.n_ranges == 2));
assert(("Largest acked is 0xABCD23456789", acki.ranges[0].high == 0xABCD23456789));
assert(("Number of timestamps is 0", acki.n_timestamps == 0));
lsquic_packno_t n = n_acked(&acki);
assert(("Number of acked packets is correct", n == 0xABCD23456768 + 1));
for (n = 0; n < 2; ++n)
assert(("Range checks out", ranges[n].high == acki.ranges[n].high
&& ranges[n].low == acki.ranges[n].low));
{
size_t sz;
for (sz = 1; sz < sizeof(ack_buf); ++sz)
{
len = pf->pf_parse_ack_frame(ack_buf, sz, &acki);
assert(("Parsing truncated frame failed", len < 0));
}
}
}
static void
test_max_ack (void)
{
lsquic_rechist_t rechist;
lsquic_time_t now;
unsigned i;
int has_missing, sz[2];
const struct lsquic_packno_range *range;
unsigned char buf[1500];
struct ack_info acki;
lsquic_rechist_init(&rechist, 12345);
now = lsquic_time_now();
for (i = 1; i <= 300; ++i)
{
lsquic_rechist_received(&rechist, i * 10, now);
now += i * 1000;
}
memset(buf, 0xAA, sizeof(buf));
sz[0] = pf->pf_gen_ack_frame(buf, sizeof(buf),
(gaf_rechist_first_f) lsquic_rechist_first,
(gaf_rechist_next_f) lsquic_rechist_next,
(gaf_rechist_largest_recv_f) lsquic_rechist_largest_recv,
&rechist, now, &has_missing);
assert(sz[0] > 0);
assert(sz[0] <= (int) sizeof(buf));
assert(has_missing);
assert(0 == buf[ sz[0] - 1 ]); /* Number of timestamps */
assert(0xAA == buf[ sz[0] ]);
sz[1] = pf->pf_parse_ack_frame(buf, sizeof(buf), &acki);
assert(sz[1] == sz[0]);
assert(256 == acki.n_ranges);
for (range = lsquic_rechist_first(&rechist), i = 0;
range && i < acki.n_ranges;
range = lsquic_rechist_next(&rechist), ++i)
{
assert(range->high == acki.ranges[i].high);
assert(range->low == acki.ranges[i].low);
}
assert(i == 256);
lsquic_rechist_cleanup(&rechist);
}
static void
test_ack_truncation (void)
{
lsquic_rechist_t rechist;
lsquic_time_t now;
unsigned i;
int has_missing, sz[2];
const struct lsquic_packno_range *range;
unsigned char buf[1500];
struct ack_info acki;
size_t bufsz;
lsquic_rechist_init(&rechist, 12345);
now = lsquic_time_now();
for (i = 1; i <= 300; ++i)
{
lsquic_rechist_received(&rechist, i * 10, now);
now += i * 1000;
}
for (bufsz = 200; bufsz < 210; ++bufsz)
{
memset(buf, 0xAA, sizeof(buf));
sz[0] = pf->pf_gen_ack_frame(buf, bufsz,
(gaf_rechist_first_f) lsquic_rechist_first,
(gaf_rechist_next_f) lsquic_rechist_next,
(gaf_rechist_largest_recv_f) lsquic_rechist_largest_recv,
&rechist, now, &has_missing);
assert(sz[0] > 0);
assert(sz[0] <= (int) bufsz);
assert(has_missing);
assert(0 == buf[ sz[0] - 1 ]); /* Number of timestamps */
assert(0xAA == buf[ sz[0] ]);
sz[1] = pf->pf_parse_ack_frame(buf, sizeof(buf), &acki);
assert(sz[1] == sz[0]);
assert(acki.n_ranges < 256);
for (range = lsquic_rechist_first(&rechist), i = 0;
range && i < acki.n_ranges;
range = lsquic_rechist_next(&rechist), ++i)
{
assert(range->high == acki.ranges[i].high);
assert(range->low == acki.ranges[i].low);
}
}
lsquic_rechist_cleanup(&rechist);
}
int
main (void)
{
lsquic_global_init(LSQUIC_GLOBAL_SERVER);
test1();
test2();
test3();
test4();
test5();
test6();
test_max_ack();
test_ack_truncation();
return 0;
}
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