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/*
* QEMU I/O channel test helpers
*
* Copyright (c) 2015 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "io-channel-helpers.h"
struct QIOChannelTest {
QIOChannel *src;
QIOChannel *dst;
bool blocking;
size_t len;
size_t niov;
char *input;
struct iovec *inputv;
char *output;
struct iovec *outputv;
Error *writeerr;
Error *readerr;
};
static void test_skip_iovec(struct iovec **iov,
size_t *niov,
size_t skip,
struct iovec *old)
{
size_t offset = 0;
size_t i;
for (i = 0; i < *niov; i++) {
if (skip < (*iov)[i].iov_len) {
old->iov_len = (*iov)[i].iov_len;
old->iov_base = (*iov)[i].iov_base;
(*iov)[i].iov_len -= skip;
(*iov)[i].iov_base += skip;
break;
} else {
skip -= (*iov)[i].iov_len;
if (i == 0 && old->iov_base) {
(*iov)[i].iov_len = old->iov_len;
(*iov)[i].iov_base = old->iov_base;
old->iov_len = 0;
old->iov_base = NULL;
}
offset++;
}
}
*iov = *iov + offset;
*niov -= offset;
}
/* This thread sends all data using iovecs */
static gpointer test_io_thread_writer(gpointer opaque)
{
QIOChannelTest *data = opaque;
struct iovec *iov = data->inputv;
size_t niov = data->niov;
struct iovec old = { 0 };
qio_channel_set_blocking(data->src, data->blocking, NULL);
while (niov) {
ssize_t ret;
ret = qio_channel_writev(data->src,
iov,
niov,
&data->writeerr);
if (ret == QIO_CHANNEL_ERR_BLOCK) {
if (data->blocking) {
error_setg(&data->writeerr,
"Unexpected I/O blocking");
break;
} else {
qio_channel_wait(data->src,
G_IO_OUT);
continue;
}
} else if (ret < 0) {
break;
} else if (ret == 0) {
error_setg(&data->writeerr,
"Unexpected zero length write");
break;
}
test_skip_iovec(&iov, &niov, ret, &old);
}
return NULL;
}
/* This thread receives all data using iovecs */
static gpointer test_io_thread_reader(gpointer opaque)
{
QIOChannelTest *data = opaque;
struct iovec *iov = data->outputv;
size_t niov = data->niov;
struct iovec old = { 0 };
qio_channel_set_blocking(data->dst, data->blocking, NULL);
while (niov) {
ssize_t ret;
ret = qio_channel_readv(data->dst,
iov,
niov,
&data->readerr);
if (ret == QIO_CHANNEL_ERR_BLOCK) {
if (data->blocking) {
error_setg(&data->writeerr,
"Unexpected I/O blocking");
break;
} else {
qio_channel_wait(data->dst,
G_IO_IN);
continue;
}
} else if (ret < 0) {
break;
} else if (ret == 0) {
break;
}
test_skip_iovec(&iov, &niov, ret, &old);
}
return NULL;
}
QIOChannelTest *qio_channel_test_new(void)
{
QIOChannelTest *data = g_new0(QIOChannelTest, 1);
size_t i;
size_t offset;
/* We'll send 1 MB of data */
#define CHUNK_COUNT 250
#define CHUNK_LEN 4194
data->len = CHUNK_COUNT * CHUNK_LEN;
data->input = g_new0(char, data->len);
data->output = g_new0(gchar, data->len);
/* Fill input with a pattern */
for (i = 0; i < data->len; i += CHUNK_LEN) {
memset(data->input + i, (i / CHUNK_LEN), CHUNK_LEN);
}
/* We'll split the data across a bunch of IO vecs */
data->niov = CHUNK_COUNT;
data->inputv = g_new0(struct iovec, data->niov);
data->outputv = g_new0(struct iovec, data->niov);
for (i = 0, offset = 0; i < data->niov; i++, offset += CHUNK_LEN) {
data->inputv[i].iov_base = data->input + offset;
data->outputv[i].iov_base = data->output + offset;
data->inputv[i].iov_len = CHUNK_LEN;
data->outputv[i].iov_len = CHUNK_LEN;
}
return data;
}
void qio_channel_test_run_threads(QIOChannelTest *test,
bool blocking,
QIOChannel *src,
QIOChannel *dst)
{
GThread *reader, *writer;
test->src = src;
test->dst = dst;
test->blocking = blocking;
reader = g_thread_new("reader",
test_io_thread_reader,
test);
writer = g_thread_new("writer",
test_io_thread_writer,
test);
g_thread_join(reader);
g_thread_join(writer);
test->dst = test->src = NULL;
}
void qio_channel_test_run_writer(QIOChannelTest *test,
QIOChannel *src)
{
test->src = src;
test_io_thread_writer(test);
test->src = NULL;
}
void qio_channel_test_run_reader(QIOChannelTest *test,
QIOChannel *dst)
{
test->dst = dst;
test_io_thread_reader(test);
test->dst = NULL;
}
void qio_channel_test_validate(QIOChannelTest *test)
{
g_assert_cmpint(memcmp(test->input,
test->output,
test->len), ==, 0);
g_assert(test->readerr == NULL);
g_assert(test->writeerr == NULL);
g_free(test->inputv);
g_free(test->outputv);
g_free(test->input);
g_free(test->output);
g_free(test);
}
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