tests/io-channel-helpers.c

   1 /*
   2  * QEMU I/O channel test helpers
   3  *
   4  * Copyright (c) 2015 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "io-channel-helpers.h"
  23
  24 struct QIOChannelTest {
  25     QIOChannel *src;
  26     QIOChannel *dst;
  27     bool blocking;
  28     size_t len;
  29     size_t niov;
  30     char *input;
  31     struct iovec *inputv;
  32     char *output;
  33     struct iovec *outputv;
  34     Error *writeerr;
  35     Error *readerr;
  36 };
  37
  38
  39 static void test_skip_iovec(struct iovec **iov,
  40                             size_t *niov,
  41                             size_t skip,
  42                             struct iovec *old)
  43 {
  44     size_t offset = 0;
  45     size_t i;
  46
  47     for (i = 0; i < *niov; i++) {
  48         if (skip < (*iov)[i].iov_len) {
  49             old->iov_len = (*iov)[i].iov_len;
  50             old->iov_base = (*iov)[i].iov_base;
  51
  52             (*iov)[i].iov_len -= skip;
  53             (*iov)[i].iov_base += skip;
  54             break;
  55         } else {
  56             skip -= (*iov)[i].iov_len;
  57
  58             if (i == 0 && old->iov_base) {
  59                 (*iov)[i].iov_len = old->iov_len;
  60                 (*iov)[i].iov_base = old->iov_base;
  61                 old->iov_len = 0;
  62                 old->iov_base = NULL;
  63             }
  64
  65             offset++;
  66         }
  67     }
  68
  69     *iov = *iov + offset;
  70     *niov -= offset;
  71 }
  72
  73
  74 /* This thread sends all data using iovecs */
  75 static gpointer test_io_thread_writer(gpointer opaque)
  76 {
  77     QIOChannelTest *data = opaque;
  78     struct iovec *iov = data->inputv;
  79     size_t niov = data->niov;
  80     struct iovec old = { 0 };
  81
  82     qio_channel_set_blocking(data->src, data->blocking, NULL);
  83
  84     while (niov) {
  85         ssize_t ret;
  86         ret = qio_channel_writev(data->src,
  87                                  iov,
  88                                  niov,
  89                                  &data->writeerr);
  90         if (ret == QIO_CHANNEL_ERR_BLOCK) {
  91             if (data->blocking) {
  92                 error_setg(&data->writeerr,
  93                            "Unexpected I/O blocking");
  94                 break;
  95             } else {
  96                 qio_channel_wait(data->src,
  97                                  G_IO_OUT);
  98                 continue;
  99             }
 100         } else if (ret < 0) {
 101             break;
 102         } else if (ret == 0) {
 103             error_setg(&data->writeerr,
 104                        "Unexpected zero length write");
 105             break;
 106         }
 107
 108         test_skip_iovec(&iov, &niov, ret, &old);
 109     }
 110
 111     return NULL;
 112 }
 113
 114
 115 /* This thread receives all data using iovecs */
 116 static gpointer test_io_thread_reader(gpointer opaque)
 117 {
 118     QIOChannelTest *data = opaque;
 119     struct iovec *iov = data->outputv;
 120     size_t niov = data->niov;
 121     struct iovec old = { 0 };
 122
 123     qio_channel_set_blocking(data->dst, data->blocking, NULL);
 124
 125     while (niov) {
 126         ssize_t ret;
 127
 128         ret = qio_channel_readv(data->dst,
 129                                 iov,
 130                                 niov,
 131                                 &data->readerr);
 132
 133         if (ret == QIO_CHANNEL_ERR_BLOCK) {
 134             if (data->blocking) {
 135                 error_setg(&data->writeerr,
 136                            "Unexpected I/O blocking");
 137                 break;
 138             } else {
 139                 qio_channel_wait(data->dst,
 140                                  G_IO_IN);
 141                 continue;
 142             }
 143         } else if (ret < 0) {
 144             break;
 145         } else if (ret == 0) {
 146             break;
 147         }
 148
 149         test_skip_iovec(&iov, &niov, ret, &old);
 150     }
 151
 152     return NULL;
 153 }
 154
 155
 156 QIOChannelTest *qio_channel_test_new(void)
 157 {
 158     QIOChannelTest *data = g_new0(QIOChannelTest, 1);
 159     size_t i;
 160     size_t offset;
 161
 162
 163     /* We'll send 1 MB of data */
 164 #define CHUNK_COUNT 250
 165 #define CHUNK_LEN 4194
 166
 167     data->len = CHUNK_COUNT * CHUNK_LEN;
 168     data->input = g_new0(char, data->len);
 169     data->output = g_new0(gchar, data->len);
 170
 171     /* Fill input with a pattern */
 172     for (i = 0; i < data->len; i += CHUNK_LEN) {
 173         memset(data->input + i, (i / CHUNK_LEN), CHUNK_LEN);
 174     }
 175
 176     /* We'll split the data across a bunch of IO vecs */
 177     data->niov = CHUNK_COUNT;
 178     data->inputv = g_new0(struct iovec, data->niov);
 179     data->outputv = g_new0(struct iovec, data->niov);
 180
 181     for (i = 0, offset = 0; i < data->niov; i++, offset += CHUNK_LEN) {
 182         data->inputv[i].iov_base = data->input + offset;
 183         data->outputv[i].iov_base = data->output + offset;
 184         data->inputv[i].iov_len = CHUNK_LEN;
 185         data->outputv[i].iov_len = CHUNK_LEN;
 186     }
 187
 188     return data;
 189 }
 190
 191 void qio_channel_test_run_threads(QIOChannelTest *test,
 192                                   bool blocking,
 193                                   QIOChannel *src,
 194                                   QIOChannel *dst)
 195 {
 196     GThread *reader, *writer;
 197
 198     test->src = src;
 199     test->dst = dst;
 200     test->blocking = blocking;
 201
 202     reader = g_thread_new("reader",
 203                           test_io_thread_reader,
 204                           test);
 205     writer = g_thread_new("writer",
 206                           test_io_thread_writer,
 207                           test);
 208
 209     g_thread_join(reader);
 210     g_thread_join(writer);
 211
 212     test->dst = test->src = NULL;
 213 }
 214
 215
 216 void qio_channel_test_run_writer(QIOChannelTest *test,
 217                                  QIOChannel *src)
 218 {
 219     test->src = src;
 220     test_io_thread_writer(test);
 221     test->src = NULL;
 222 }
 223
 224
 225 void qio_channel_test_run_reader(QIOChannelTest *test,
 226                                  QIOChannel *dst)
 227 {
 228     test->dst = dst;
 229     test_io_thread_reader(test);
 230     test->dst = NULL;
 231 }
 232
 233
 234 void qio_channel_test_validate(QIOChannelTest *test)
 235 {
 236     g_assert_cmpint(memcmp(test->input,
 237                            test->output,
 238                            test->len), ==, 0);
 239     g_assert(test->readerr == NULL);
 240     g_assert(test->writeerr == NULL);
 241
 242     g_free(test->inputv);
 243     g_free(test->outputv);
 244     g_free(test->input);
 245     g_free(test->output);
 246     g_free(test);
 247 }