tests/test-conntrack.c

   1 /*
   2  * Copyright (c) 2015, 2017 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18 #include "conntrack.h"
  19
  20 #include "dp-packet.h"
  21 #include "fatal-signal.h"
  22 #include "flow.h"
  23 #include "netdev.h"
  24 #include "ovs-thread.h"
  25 #include "ovstest.h"
  26 #include "pcap-file.h"
  27 #include "timeval.h"
  28
  29 static const char payload[] = "50540000000a50540000000908004500001c0000000000"
  30                               "11a4cd0a0101010a0101020001000200080000";
  31
  32 static struct dp_packet_batch *
  33 prepare_packets(size_t n, bool change, unsigned tid, ovs_be16 *dl_type)
  34 {
  35     struct dp_packet_batch *pkt_batch = xzalloc(sizeof *pkt_batch);
  36     struct flow flow;
  37     size_t i;
  38
  39     ovs_assert(n <= ARRAY_SIZE(pkt_batch->packets));
  40
  41     dp_packet_batch_init(pkt_batch);
  42     for (i = 0; i < n; i++) {
  43         struct udp_header *udp;
  44         struct dp_packet *pkt = dp_packet_new(sizeof payload/2);
  45
  46         dp_packet_put_hex(pkt, payload, NULL);
  47         flow_extract(pkt, &flow);
  48
  49         udp = dp_packet_l4(pkt);
  50         udp->udp_src = htons(ntohs(udp->udp_src) + tid);
  51
  52         if (change) {
  53             udp->udp_dst = htons(ntohs(udp->udp_dst) + i);
  54         }
  55
  56         dp_packet_batch_add(pkt_batch, pkt);
  57         *dl_type = flow.dl_type;
  58     }
  59
  60     return pkt_batch;
  61 }
  62
  63 static void
  64 destroy_packets(struct dp_packet_batch *pkt_batch)
  65 {
  66     dp_packet_delete_batch(pkt_batch, true);
  67     free(pkt_batch);
  68 }
  69
  70 struct thread_aux {
  71     pthread_t thread;
  72     unsigned tid;
  73 };
  74
  75 static struct conntrack *ct;
  76 static unsigned long n_threads, n_pkts, batch_size;
  77 static bool change_conn = false;
  78 static struct ovs_barrier barrier;
  79
  80 static void *
  81 ct_thread_main(void *aux_)
  82 {
  83     struct thread_aux *aux = aux_;
  84     struct dp_packet_batch *pkt_batch;
  85     ovs_be16 dl_type;
  86     size_t i;
  87     long long now = time_msec();
  88
  89     pkt_batch = prepare_packets(batch_size, change_conn, aux->tid, &dl_type);
  90     ovs_barrier_block(&barrier);
  91     for (i = 0; i < n_pkts; i += batch_size) {
  92         conntrack_execute(ct, pkt_batch, dl_type, false, true, 0, NULL, NULL,
  93                           0, 0, NULL, NULL, now, 0);
  94     }
  95     ovs_barrier_block(&barrier);
  96     destroy_packets(pkt_batch);
  97
  98     return NULL;
  99 }
 100
 101 static void
 102 test_benchmark(struct ovs_cmdl_context *ctx)
 103 {
 104     struct thread_aux *threads;
 105     long long start;
 106     unsigned i;
 107
 108     fatal_signal_init();
 109
 110     /* Parse arguments */
 111     n_threads = strtoul(ctx->argv[1], NULL, 0);
 112     if (!n_threads) {
 113         ovs_fatal(0, "n_threads must be at least one");
 114     }
 115     n_pkts = strtoul(ctx->argv[2], NULL, 0);
 116     batch_size = strtoul(ctx->argv[3], NULL, 0);
 117     if (batch_size == 0 || batch_size > NETDEV_MAX_BURST) {
 118         ovs_fatal(0, "batch_size must be between 1 and NETDEV_MAX_BURST(%u)",
 119                   NETDEV_MAX_BURST);
 120     }
 121     if (ctx->argc > 4) {
 122         change_conn = strtoul(ctx->argv[4], NULL, 0);
 123     }
 124
 125     threads = xcalloc(n_threads, sizeof *threads);
 126     ovs_barrier_init(&barrier, n_threads + 1);
 127     ct = conntrack_init();
 128
 129     /* Create threads */
 130     for (i = 0; i < n_threads; i++) {
 131         threads[i].tid = i;
 132         threads[i].thread = ovs_thread_create("ct_thread", ct_thread_main,
 133                                               &threads[i]);
 134     }
 135     /* Starts the work inside the threads */
 136     ovs_barrier_block(&barrier);
 137     start = time_msec();
 138
 139     /* Wait for the threads to finish the work */
 140     ovs_barrier_block(&barrier);
 141     printf("conntrack:  %5lld ms\n", time_msec() - start);
 142
 143     for (i = 0; i < n_threads; i++) {
 144         xpthread_join(threads[i].thread, NULL);
 145     }
 146
 147     conntrack_destroy(ct);
 148     ovs_barrier_destroy(&barrier);
 149     free(threads);
 150 }
 151
 152 static void
 153 pcap_batch_execute_conntrack(struct conntrack *ct_,
 154                              struct dp_packet_batch *pkt_batch)
 155 {
 156     struct dp_packet_batch new_batch;
 157     ovs_be16 dl_type = htons(0);
 158     long long now = time_msec();
 159
 160     dp_packet_batch_init(&new_batch);
 161
 162     /* pkt_batch contains packets with different 'dl_type'. We have to
 163      * call conntrack_execute() on packets with the same 'dl_type'. */
 164     struct dp_packet *packet;
 165     DP_PACKET_BATCH_FOR_EACH (i, packet, pkt_batch) {
 166         struct flow flow;
 167
 168         /* This also initializes the l3 and l4 pointers. */
 169         flow_extract(packet, &flow);
 170
 171         if (dp_packet_batch_is_empty(&new_batch)) {
 172             dl_type = flow.dl_type;
 173         }
 174
 175         if (flow.dl_type != dl_type) {
 176             conntrack_execute(ct_, &new_batch, dl_type, false, true, 0,
 177                               NULL, NULL, 0, 0, NULL, NULL, now, 0);
 178             dp_packet_batch_init(&new_batch);
 179         }
 180         dp_packet_batch_add(&new_batch, packet);
 181     }
 182
 183     if (!dp_packet_batch_is_empty(&new_batch)) {
 184         conntrack_execute(ct_, &new_batch, dl_type, false, true, 0, NULL, NULL,
 185                           0, 0, NULL, NULL, now, 0);
 186     }
 187
 188 }
 189
 190 static void
 191 test_pcap(struct ovs_cmdl_context *ctx)
 192 {
 193     size_t total_count, batch_size_;
 194     struct pcap_file *pcap;
 195     int err = 0;
 196
 197     pcap = ovs_pcap_open(ctx->argv[1], "rb");
 198     if (!pcap) {
 199         return;
 200     }
 201
 202     batch_size_ = 1;
 203     if (ctx->argc > 2) {
 204         batch_size_ = strtoul(ctx->argv[2], NULL, 0);
 205         if (batch_size_ == 0 || batch_size_ > NETDEV_MAX_BURST) {
 206             ovs_fatal(0,
 207                       "batch_size must be between 1 and NETDEV_MAX_BURST(%u)",
 208                       NETDEV_MAX_BURST);
 209         }
 210     }
 211
 212     fatal_signal_init();
 213
 214     ct = conntrack_init();
 215     total_count = 0;
 216     for (;;) {
 217         struct dp_packet *packet;
 218         struct dp_packet_batch pkt_batch_;
 219         struct dp_packet_batch *batch = &pkt_batch_;
 220
 221         dp_packet_batch_init(batch);
 222         for (int i = 0; i < batch_size_; i++) {
 223             err = ovs_pcap_read(pcap, &packet, NULL);
 224             if (err) {
 225                 break;
 226             }
 227             dp_packet_batch_add(batch, packet);
 228         }
 229         if (dp_packet_batch_is_empty(batch)) {
 230             break;
 231         }
 232         pcap_batch_execute_conntrack(ct, batch);
 233
 234         DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
 235             struct ds ds = DS_EMPTY_INITIALIZER;
 236
 237             total_count++;
 238
 239             format_flags(&ds, ct_state_to_string, packet->md.ct_state, '|');
 240             printf("%"PRIuSIZE": %s\n", total_count, ds_cstr(&ds));
 241
 242             ds_destroy(&ds);
 243         }
 244
 245         dp_packet_delete_batch(batch, true);
 246     }
 247     conntrack_destroy(ct);
 248     ovs_pcap_close(pcap);
 249 }
 250 \f
 251 static const struct ovs_cmdl_command commands[] = {
 252     /* Connection tracker tests. */
 253     /* Starts 'n_threads' threads. Each thread will send 'n_pkts' packets to
 254      * the connection tracker, 'batch_size' per call. If 'change_connection'
 255      * is '1', each packet in a batch will have a different source and
 256      * destination port */
 257     {"benchmark", "n_threads n_pkts batch_size [change_connection]", 3, 4,
 258      test_benchmark, OVS_RO},
 259     /* Reads packets from 'file' and sends them to the connection tracker,
 260      * 'batch_size' (1 by default) per call, with the commit flag set.
 261      * Prints the ct_state of each packet. */
 262     {"pcap", "file [batch_size]", 1, 2, test_pcap, OVS_RO},
 263
 264     {NULL, NULL, 0, 0, NULL, OVS_RO},
 265 };
 266
 267 static void
 268 test_conntrack_main(int argc, char *argv[])
 269 {
 270     struct ovs_cmdl_context ctx = {
 271         .argc = argc - 1,
 272         .argv = argv + 1,
 273     };
 274     set_program_name(argv[0]);
 275     ovs_cmdl_run_command(&ctx, commands);
 276 }
 277
 278 OVSTEST_REGISTER("test-conntrack", test_conntrack_main);