net/colo-compare.c

   1 /*
   2  * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
   3  * (a.k.a. Fault Tolerance or Continuous Replication)
   4  *
   5  * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
   6  * Copyright (c) 2016 FUJITSU LIMITED
   7  * Copyright (c) 2016 Intel Corporation
   8  *
   9  * Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or
  12  * later.  See the COPYING file in the top-level directory.
  13  */
  14
  15 #include "qemu/osdep.h"
  16 #include "qemu/error-report.h"
  17 #include "trace.h"
  18 #include "qemu-common.h"
  19 #include "qapi/qmp/qerror.h"
  20 #include "qapi/error.h"
  21 #include "net/net.h"
  22 #include "net/eth.h"
  23 #include "qom/object_interfaces.h"
  24 #include "qemu/iov.h"
  25 #include "qom/object.h"
  26 #include "qemu/typedefs.h"
  27 #include "net/queue.h"
  28 #include "sysemu/char.h"
  29 #include "qemu/sockets.h"
  30 #include "qapi-visit.h"
  31 #include "net/colo.h"
  32
  33 #define TYPE_COLO_COMPARE "colo-compare"
  34 #define COLO_COMPARE(obj) \
  35     OBJECT_CHECK(CompareState, (obj), TYPE_COLO_COMPARE)
  36
  37 #define COMPARE_READ_LEN_MAX NET_BUFSIZE
  38 #define MAX_QUEUE_SIZE 1024
  39
  40 /* TODO: Should be configurable */
  41 #define REGULAR_PACKET_CHECK_MS 3000
  42
  43 /*
  44   + CompareState ++
  45   |               |
  46   +---------------+   +---------------+         +---------------+
  47   |conn list      +--->conn           +--------->conn           |
  48   +---------------+   +---------------+         +---------------+
  49   |               |     |           |             |          |
  50   +---------------+ +---v----+  +---v----+    +---v----+ +---v----+
  51                     |primary |  |secondary    |primary | |secondary
  52                     |packet  |  |packet  +    |packet  | |packet  +
  53                     +--------+  +--------+    +--------+ +--------+
  54                         |           |             |          |
  55                     +---v----+  +---v----+    +---v----+ +---v----+
  56                     |primary |  |secondary    |primary | |secondary
  57                     |packet  |  |packet  +    |packet  | |packet  +
  58                     +--------+  +--------+    +--------+ +--------+
  59                         |           |             |          |
  60                     +---v----+  +---v----+    +---v----+ +---v----+
  61                     |primary |  |secondary    |primary | |secondary
  62                     |packet  |  |packet  +    |packet  | |packet  +
  63                     +--------+  +--------+    +--------+ +--------+
  64 */
  65 typedef struct CompareState {
  66     Object parent;
  67
  68     char *pri_indev;
  69     char *sec_indev;
  70     char *outdev;
  71     CharBackend chr_pri_in;
  72     CharBackend chr_sec_in;
  73     CharBackend chr_out;
  74     SocketReadState pri_rs;
  75     SocketReadState sec_rs;
  76
  77     /* connection list: the connections belonged to this NIC could be found
  78      * in this list.
  79      * element type: Connection
  80      */
  81     GQueue conn_list;
  82     /* hashtable to save connection */
  83     GHashTable *connection_track_table;
  84     /* compare thread, a thread for each NIC */
  85     QemuThread thread;
  86
  87     GMainContext *worker_context;
  88     GMainLoop *compare_loop;
  89 } CompareState;
  90
  91 typedef struct CompareClass {
  92     ObjectClass parent_class;
  93 } CompareClass;
  94
  95 enum {
  96     PRIMARY_IN = 0,
  97     SECONDARY_IN,
  98 };
  99
 100 static int compare_chr_send(CharBackend *out,
 101                             const uint8_t *buf,
 102                             uint32_t size);
 103
 104 static gint seq_sorter(Packet *a, Packet *b, gpointer data)
 105 {
 106     struct tcphdr *atcp, *btcp;
 107
 108     atcp = (struct tcphdr *)(a->transport_header);
 109     btcp = (struct tcphdr *)(b->transport_header);
 110     return ntohl(atcp->th_seq) - ntohl(btcp->th_seq);
 111 }
 112
 113 /*
 114  * Return 0 on success, if return -1 means the pkt
 115  * is unsupported(arp and ipv6) and will be sent later
 116  */
 117 static int packet_enqueue(CompareState *s, int mode)
 118 {
 119     ConnectionKey key;
 120     Packet *pkt = NULL;
 121     Connection *conn;
 122
 123     if (mode == PRIMARY_IN) {
 124         pkt = packet_new(s->pri_rs.buf, s->pri_rs.packet_len);
 125     } else {
 126         pkt = packet_new(s->sec_rs.buf, s->sec_rs.packet_len);
 127     }
 128
 129     if (parse_packet_early(pkt)) {
 130         packet_destroy(pkt, NULL);
 131         pkt = NULL;
 132         return -1;
 133     }
 134     fill_connection_key(pkt, &key);
 135
 136     conn = connection_get(s->connection_track_table,
 137                           &key,
 138                           &s->conn_list);
 139
 140     if (!conn->processing) {
 141         g_queue_push_tail(&s->conn_list, conn);
 142         conn->processing = true;
 143     }
 144
 145     if (mode == PRIMARY_IN) {
 146         if (g_queue_get_length(&conn->primary_list) <=
 147                                MAX_QUEUE_SIZE) {
 148             g_queue_push_tail(&conn->primary_list, pkt);
 149             if (conn->ip_proto == IPPROTO_TCP) {
 150                 g_queue_sort(&conn->primary_list,
 151                              (GCompareDataFunc)seq_sorter,
 152                              NULL);
 153             }
 154         } else {
 155             error_report("colo compare primary queue size too big,"
 156                          "drop packet");
 157         }
 158     } else {
 159         if (g_queue_get_length(&conn->secondary_list) <=
 160                                MAX_QUEUE_SIZE) {
 161             g_queue_push_tail(&conn->secondary_list, pkt);
 162             if (conn->ip_proto == IPPROTO_TCP) {
 163                 g_queue_sort(&conn->secondary_list,
 164                              (GCompareDataFunc)seq_sorter,
 165                              NULL);
 166             }
 167         } else {
 168             error_report("colo compare secondary queue size too big,"
 169                          "drop packet");
 170         }
 171     }
 172
 173     return 0;
 174 }
 175
 176 /*
 177  * The IP packets sent by primary and secondary
 178  * will be compared in here
 179  * TODO support ip fragment, Out-Of-Order
 180  * return:    0  means packet same
 181  *            > 0 || < 0 means packet different
 182  */
 183 static int colo_packet_compare_common(Packet *ppkt, Packet *spkt)
 184 {
 185     trace_colo_compare_ip_info(ppkt->size, inet_ntoa(ppkt->ip->ip_src),
 186                                inet_ntoa(ppkt->ip->ip_dst), spkt->size,
 187                                inet_ntoa(spkt->ip->ip_src),
 188                                inet_ntoa(spkt->ip->ip_dst));
 189
 190     if (ppkt->size == spkt->size) {
 191         return memcmp(ppkt->data, spkt->data, spkt->size);
 192     } else {
 193         trace_colo_compare_main("Net packet size are not the same");
 194         return -1;
 195     }
 196 }
 197
 198 /*
 199  * Called from the compare thread on the primary
 200  * for compare tcp packet
 201  * compare_tcp copied from Dr. David Alan Gilbert's branch
 202  */
 203 static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt)
 204 {
 205     struct tcphdr *ptcp, *stcp;
 206     int res;
 207
 208     trace_colo_compare_main("compare tcp");
 209
 210     if (ppkt->size != spkt->size) {
 211         if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) {
 212             trace_colo_compare_main("pkt size not same");
 213         }
 214         return -1;
 215     }
 216
 217     ptcp = (struct tcphdr *)ppkt->transport_header;
 218     stcp = (struct tcphdr *)spkt->transport_header;
 219
 220     /*
 221      * The 'identification' field in the IP header is *very* random
 222      * it almost never matches.  Fudge this by ignoring differences in
 223      * unfragmented packets; they'll normally sort themselves out if different
 224      * anyway, and it should recover at the TCP level.
 225      * An alternative would be to get both the primary and secondary to rewrite
 226      * somehow; but that would need some sync traffic to sync the state
 227      */
 228     if (ntohs(ppkt->ip->ip_off) & IP_DF) {
 229         spkt->ip->ip_id = ppkt->ip->ip_id;
 230         /* and the sum will be different if the IDs were different */
 231         spkt->ip->ip_sum = ppkt->ip->ip_sum;
 232     }
 233
 234     res = memcmp(ppkt->data + ETH_HLEN, spkt->data + ETH_HLEN,
 235                 (spkt->size - ETH_HLEN));
 236
 237     if (res != 0 && trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) {
 238         trace_colo_compare_pkt_info_src(inet_ntoa(ppkt->ip->ip_src),
 239                                         ntohl(stcp->th_seq),
 240                                         ntohl(stcp->th_ack),
 241                                         res, stcp->th_flags,
 242                                         spkt->size);
 243
 244         trace_colo_compare_pkt_info_dst(inet_ntoa(ppkt->ip->ip_dst),
 245                                         ntohl(ptcp->th_seq),
 246                                         ntohl(ptcp->th_ack),
 247                                         res, ptcp->th_flags,
 248                                         ppkt->size);
 249
 250         qemu_hexdump((char *)ppkt->data, stderr,
 251                      "colo-compare ppkt", ppkt->size);
 252         qemu_hexdump((char *)spkt->data, stderr,
 253                      "colo-compare spkt", spkt->size);
 254     }
 255
 256     return res;
 257 }
 258
 259 /*
 260  * Called from the compare thread on the primary
 261  * for compare udp packet
 262  */
 263 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt)
 264 {
 265     int ret;
 266
 267     trace_colo_compare_main("compare udp");
 268
 269     ret = colo_packet_compare_common(ppkt, spkt);
 270
 271     if (ret) {
 272         trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size);
 273         qemu_hexdump((char *)ppkt->data, stderr, "colo-compare", ppkt->size);
 274         trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size);
 275         qemu_hexdump((char *)spkt->data, stderr, "colo-compare", spkt->size);
 276     }
 277
 278     return ret;
 279 }
 280
 281 /*
 282  * Called from the compare thread on the primary
 283  * for compare icmp packet
 284  */
 285 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt)
 286 {
 287     trace_colo_compare_main("compare icmp");
 288
 289     if (colo_packet_compare_common(ppkt, spkt)) {
 290         trace_colo_compare_icmp_miscompare("primary pkt size",
 291                                            ppkt->size);
 292         qemu_hexdump((char *)ppkt->data, stderr, "colo-compare",
 293                      ppkt->size);
 294         trace_colo_compare_icmp_miscompare("Secondary pkt size",
 295                                            spkt->size);
 296         qemu_hexdump((char *)spkt->data, stderr, "colo-compare",
 297                      spkt->size);
 298         return -1;
 299     } else {
 300         return 0;
 301     }
 302 }
 303
 304 /*
 305  * Called from the compare thread on the primary
 306  * for compare other packet
 307  */
 308 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt)
 309 {
 310     trace_colo_compare_main("compare other");
 311     trace_colo_compare_ip_info(ppkt->size, inet_ntoa(ppkt->ip->ip_src),
 312                                inet_ntoa(ppkt->ip->ip_dst), spkt->size,
 313                                inet_ntoa(spkt->ip->ip_src),
 314                                inet_ntoa(spkt->ip->ip_dst));
 315     return colo_packet_compare_common(ppkt, spkt);
 316 }
 317
 318 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time)
 319 {
 320     int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST);
 321
 322     if ((now - pkt->creation_ms) > (*check_time)) {
 323         trace_colo_old_packet_check_found(pkt->creation_ms);
 324         return 0;
 325     } else {
 326         return 1;
 327     }
 328 }
 329
 330 static void colo_old_packet_check_one_conn(void *opaque,
 331                                            void *user_data)
 332 {
 333     Connection *conn = opaque;
 334     GList *result = NULL;
 335     int64_t check_time = REGULAR_PACKET_CHECK_MS;
 336
 337     result = g_queue_find_custom(&conn->primary_list,
 338                                  &check_time,
 339                                  (GCompareFunc)colo_old_packet_check_one);
 340
 341     if (result) {
 342         /* do checkpoint will flush old packet */
 343         /* TODO: colo_notify_checkpoint();*/
 344     }
 345 }
 346
 347 /*
 348  * Look for old packets that the secondary hasn't matched,
 349  * if we have some then we have to checkpoint to wake
 350  * the secondary up.
 351  */
 352 static void colo_old_packet_check(void *opaque)
 353 {
 354     CompareState *s = opaque;
 355
 356     g_queue_foreach(&s->conn_list, colo_old_packet_check_one_conn, NULL);
 357 }
 358
 359 /*
 360  * Called from the compare thread on the primary
 361  * for compare connection
 362  */
 363 static void colo_compare_connection(void *opaque, void *user_data)
 364 {
 365     CompareState *s = user_data;
 366     Connection *conn = opaque;
 367     Packet *pkt = NULL;
 368     GList *result = NULL;
 369     int ret;
 370
 371     while (!g_queue_is_empty(&conn->primary_list) &&
 372            !g_queue_is_empty(&conn->secondary_list)) {
 373         pkt = g_queue_pop_tail(&conn->primary_list);
 374         switch (conn->ip_proto) {
 375         case IPPROTO_TCP:
 376             result = g_queue_find_custom(&conn->secondary_list,
 377                      pkt, (GCompareFunc)colo_packet_compare_tcp);
 378             break;
 379         case IPPROTO_UDP:
 380             result = g_queue_find_custom(&conn->secondary_list,
 381                      pkt, (GCompareFunc)colo_packet_compare_udp);
 382             break;
 383         case IPPROTO_ICMP:
 384             result = g_queue_find_custom(&conn->secondary_list,
 385                      pkt, (GCompareFunc)colo_packet_compare_icmp);
 386             break;
 387         default:
 388             result = g_queue_find_custom(&conn->secondary_list,
 389                      pkt, (GCompareFunc)colo_packet_compare_other);
 390             break;
 391         }
 392
 393         if (result) {
 394             ret = compare_chr_send(&s->chr_out, pkt->data, pkt->size);
 395             if (ret < 0) {
 396                 error_report("colo_send_primary_packet failed");
 397             }
 398             trace_colo_compare_main("packet same and release packet");
 399             g_queue_remove(&conn->secondary_list, result->data);
 400             packet_destroy(pkt, NULL);
 401         } else {
 402             /*
 403              * If one packet arrive late, the secondary_list or
 404              * primary_list will be empty, so we can't compare it
 405              * until next comparison.
 406              */
 407             trace_colo_compare_main("packet different");
 408             g_queue_push_tail(&conn->primary_list, pkt);
 409             /* TODO: colo_notify_checkpoint();*/
 410             break;
 411         }
 412     }
 413 }
 414
 415 static int compare_chr_send(CharBackend *out,
 416                             const uint8_t *buf,
 417                             uint32_t size)
 418 {
 419     int ret = 0;
 420     uint32_t len = htonl(size);
 421
 422     if (!size) {
 423         return 0;
 424     }
 425
 426     ret = qemu_chr_fe_write_all(out, (uint8_t *)&len, sizeof(len));
 427     if (ret != sizeof(len)) {
 428         goto err;
 429     }
 430
 431     ret = qemu_chr_fe_write_all(out, (uint8_t *)buf, size);
 432     if (ret != size) {
 433         goto err;
 434     }
 435
 436     return 0;
 437
 438 err:
 439     return ret < 0 ? ret : -EIO;
 440 }
 441
 442 static int compare_chr_can_read(void *opaque)
 443 {
 444     return COMPARE_READ_LEN_MAX;
 445 }
 446
 447 /*
 448  * Called from the main thread on the primary for packets
 449  * arriving over the socket from the primary.
 450  */
 451 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size)
 452 {
 453     CompareState *s = COLO_COMPARE(opaque);
 454     int ret;
 455
 456     ret = net_fill_rstate(&s->pri_rs, buf, size);
 457     if (ret == -1) {
 458         qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL,
 459                                  NULL, NULL, true);
 460         error_report("colo-compare primary_in error");
 461     }
 462 }
 463
 464 /*
 465  * Called from the main thread on the primary for packets
 466  * arriving over the socket from the secondary.
 467  */
 468 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size)
 469 {
 470     CompareState *s = COLO_COMPARE(opaque);
 471     int ret;
 472
 473     ret = net_fill_rstate(&s->sec_rs, buf, size);
 474     if (ret == -1) {
 475         qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL,
 476                                  NULL, NULL, true);
 477         error_report("colo-compare secondary_in error");
 478     }
 479 }
 480
 481 /*
 482  * Check old packet regularly so it can watch for any packets
 483  * that the secondary hasn't produced equivalents of.
 484  */
 485 static gboolean check_old_packet_regular(void *opaque)
 486 {
 487     CompareState *s = opaque;
 488
 489     /* if have old packet we will notify checkpoint */
 490     colo_old_packet_check(s);
 491
 492     return TRUE;
 493 }
 494
 495 static void *colo_compare_thread(void *opaque)
 496 {
 497     CompareState *s = opaque;
 498     GSource *timeout_source;
 499
 500     s->worker_context = g_main_context_new();
 501
 502     qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read,
 503                           compare_pri_chr_in, NULL, s, s->worker_context, true);
 504     qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read,
 505                           compare_sec_chr_in, NULL, s, s->worker_context, true);
 506
 507     s->compare_loop = g_main_loop_new(s->worker_context, FALSE);
 508
 509     /* To kick any packets that the secondary doesn't match */
 510     timeout_source = g_timeout_source_new(REGULAR_PACKET_CHECK_MS);
 511     g_source_set_callback(timeout_source,
 512                           (GSourceFunc)check_old_packet_regular, s, NULL);
 513     g_source_attach(timeout_source, s->worker_context);
 514
 515     g_main_loop_run(s->compare_loop);
 516
 517     g_source_unref(timeout_source);
 518     g_main_loop_unref(s->compare_loop);
 519     g_main_context_unref(s->worker_context);
 520     return NULL;
 521 }
 522
 523 static char *compare_get_pri_indev(Object *obj, Error **errp)
 524 {
 525     CompareState *s = COLO_COMPARE(obj);
 526
 527     return g_strdup(s->pri_indev);
 528 }
 529
 530 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp)
 531 {
 532     CompareState *s = COLO_COMPARE(obj);
 533
 534     g_free(s->pri_indev);
 535     s->pri_indev = g_strdup(value);
 536 }
 537
 538 static char *compare_get_sec_indev(Object *obj, Error **errp)
 539 {
 540     CompareState *s = COLO_COMPARE(obj);
 541
 542     return g_strdup(s->sec_indev);
 543 }
 544
 545 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp)
 546 {
 547     CompareState *s = COLO_COMPARE(obj);
 548
 549     g_free(s->sec_indev);
 550     s->sec_indev = g_strdup(value);
 551 }
 552
 553 static char *compare_get_outdev(Object *obj, Error **errp)
 554 {
 555     CompareState *s = COLO_COMPARE(obj);
 556
 557     return g_strdup(s->outdev);
 558 }
 559
 560 static void compare_set_outdev(Object *obj, const char *value, Error **errp)
 561 {
 562     CompareState *s = COLO_COMPARE(obj);
 563
 564     g_free(s->outdev);
 565     s->outdev = g_strdup(value);
 566 }
 567
 568 static void compare_pri_rs_finalize(SocketReadState *pri_rs)
 569 {
 570     CompareState *s = container_of(pri_rs, CompareState, pri_rs);
 571
 572     if (packet_enqueue(s, PRIMARY_IN)) {
 573         trace_colo_compare_main("primary: unsupported packet in");
 574         compare_chr_send(&s->chr_out, pri_rs->buf, pri_rs->packet_len);
 575     } else {
 576         /* compare connection */
 577         g_queue_foreach(&s->conn_list, colo_compare_connection, s);
 578     }
 579 }
 580
 581 static void compare_sec_rs_finalize(SocketReadState *sec_rs)
 582 {
 583     CompareState *s = container_of(sec_rs, CompareState, sec_rs);
 584
 585     if (packet_enqueue(s, SECONDARY_IN)) {
 586         trace_colo_compare_main("secondary: unsupported packet in");
 587     } else {
 588         /* compare connection */
 589         g_queue_foreach(&s->conn_list, colo_compare_connection, s);
 590     }
 591 }
 592
 593
 594 /*
 595  * Return 0 is success.
 596  * Return 1 is failed.
 597  */
 598 static int find_and_check_chardev(Chardev **chr,
 599                                   char *chr_name,
 600                                   Error **errp)
 601 {
 602     *chr = qemu_chr_find(chr_name);
 603     if (*chr == NULL) {
 604         error_setg(errp, "Device '%s' not found",
 605                    chr_name);
 606         return 1;
 607     }
 608
 609     if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) {
 610         error_setg(errp, "chardev \"%s\" is not reconnectable",
 611                    chr_name);
 612         return 1;
 613     }
 614
 615     return 0;
 616 }
 617
 618 /*
 619  * Called from the main thread on the primary
 620  * to setup colo-compare.
 621  */
 622 static void colo_compare_complete(UserCreatable *uc, Error **errp)
 623 {
 624     CompareState *s = COLO_COMPARE(uc);
 625     Chardev *chr;
 626     char thread_name[64];
 627     static int compare_id;
 628
 629     if (!s->pri_indev || !s->sec_indev || !s->outdev) {
 630         error_setg(errp, "colo compare needs 'primary_in' ,"
 631                    "'secondary_in','outdev' property set");
 632         return;
 633     } else if (!strcmp(s->pri_indev, s->outdev) ||
 634                !strcmp(s->sec_indev, s->outdev) ||
 635                !strcmp(s->pri_indev, s->sec_indev)) {
 636         error_setg(errp, "'indev' and 'outdev' could not be same "
 637                    "for compare module");
 638         return;
 639     }
 640
 641     if (find_and_check_chardev(&chr, s->pri_indev, errp) ||
 642         !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) {
 643         return;
 644     }
 645
 646     if (find_and_check_chardev(&chr, s->sec_indev, errp) ||
 647         !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) {
 648         return;
 649     }
 650
 651     if (find_and_check_chardev(&chr, s->outdev, errp) ||
 652         !qemu_chr_fe_init(&s->chr_out, chr, errp)) {
 653         return;
 654     }
 655
 656     net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize);
 657     net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize);
 658
 659     g_queue_init(&s->conn_list);
 660
 661     s->connection_track_table = g_hash_table_new_full(connection_key_hash,
 662                                                       connection_key_equal,
 663                                                       g_free,
 664                                                       connection_destroy);
 665
 666     sprintf(thread_name, "colo-compare %d", compare_id);
 667     qemu_thread_create(&s->thread, thread_name,
 668                        colo_compare_thread, s,
 669                        QEMU_THREAD_JOINABLE);
 670     compare_id++;
 671
 672     return;
 673 }
 674
 675 static void colo_flush_packets(void *opaque, void *user_data)
 676 {
 677     CompareState *s = user_data;
 678     Connection *conn = opaque;
 679     Packet *pkt = NULL;
 680
 681     while (!g_queue_is_empty(&conn->primary_list)) {
 682         pkt = g_queue_pop_head(&conn->primary_list);
 683         compare_chr_send(&s->chr_out, pkt->data, pkt->size);
 684         packet_destroy(pkt, NULL);
 685     }
 686     while (!g_queue_is_empty(&conn->secondary_list)) {
 687         pkt = g_queue_pop_head(&conn->secondary_list);
 688         packet_destroy(pkt, NULL);
 689     }
 690 }
 691
 692 static void colo_compare_class_init(ObjectClass *oc, void *data)
 693 {
 694     UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
 695
 696     ucc->complete = colo_compare_complete;
 697 }
 698
 699 static void colo_compare_init(Object *obj)
 700 {
 701     object_property_add_str(obj, "primary_in",
 702                             compare_get_pri_indev, compare_set_pri_indev,
 703                             NULL);
 704     object_property_add_str(obj, "secondary_in",
 705                             compare_get_sec_indev, compare_set_sec_indev,
 706                             NULL);
 707     object_property_add_str(obj, "outdev",
 708                             compare_get_outdev, compare_set_outdev,
 709                             NULL);
 710 }
 711
 712 static void colo_compare_finalize(Object *obj)
 713 {
 714     CompareState *s = COLO_COMPARE(obj);
 715
 716     qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL,
 717                              s->worker_context, true);
 718     qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL,
 719                              s->worker_context, true);
 720     qemu_chr_fe_deinit(&s->chr_out);
 721
 722     g_main_loop_quit(s->compare_loop);
 723     qemu_thread_join(&s->thread);
 724
 725     /* Release all unhandled packets after compare thead exited */
 726     g_queue_foreach(&s->conn_list, colo_flush_packets, s);
 727
 728     g_queue_clear(&s->conn_list);
 729
 730     g_hash_table_destroy(s->connection_track_table);
 731     g_free(s->pri_indev);
 732     g_free(s->sec_indev);
 733     g_free(s->outdev);
 734 }
 735
 736 static const TypeInfo colo_compare_info = {
 737     .name = TYPE_COLO_COMPARE,
 738     .parent = TYPE_OBJECT,
 739     .instance_size = sizeof(CompareState),
 740     .instance_init = colo_compare_init,
 741     .instance_finalize = colo_compare_finalize,
 742     .class_size = sizeof(CompareClass),
 743     .class_init = colo_compare_class_init,
 744     .interfaces = (InterfaceInfo[]) {
 745         { TYPE_USER_CREATABLE },
 746         { }
 747     }
 748 };
 749
 750 static void register_types(void)
 751 {
 752     type_register_static(&colo_compare_info);
 753 }
 754
 755 type_init(register_types);