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, int offset) 184 { 185 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 186 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 187 188 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 189 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 190 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 191 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 192 193 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 194 pri_ip_dst, spkt->size, 195 sec_ip_src, sec_ip_dst); 196 } 197 198 if (ppkt->size == spkt->size) { 199 return memcmp(ppkt->data + offset, spkt->data + offset, 200 spkt->size - offset); 201 } else { 202 trace_colo_compare_main("Net packet size are not the same"); 203 return -1; 204 } 205 } 206 207 /* 208 * Called from the compare thread on the primary 209 * for compare tcp packet 210 * compare_tcp copied from Dr. David Alan Gilbert's branch 211 */ 212 static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt) 213 { 214 struct tcphdr *ptcp, *stcp; 215 int res; 216 217 trace_colo_compare_main("compare tcp"); 218 219 ptcp = (struct tcphdr *)ppkt->transport_header; 220 stcp = (struct tcphdr *)spkt->transport_header; 221 222 /* 223 * The 'identification' field in the IP header is *very* random 224 * it almost never matches. Fudge this by ignoring differences in 225 * unfragmented packets; they'll normally sort themselves out if different 226 * anyway, and it should recover at the TCP level. 227 * An alternative would be to get both the primary and secondary to rewrite 228 * somehow; but that would need some sync traffic to sync the state 229 */ 230 if (ntohs(ppkt->ip->ip_off) & IP_DF) { 231 spkt->ip->ip_id = ppkt->ip->ip_id; 232 /* and the sum will be different if the IDs were different */ 233 spkt->ip->ip_sum = ppkt->ip->ip_sum; 234 } 235 236 /* 237 * Check tcp header length for tcp option field. 238 * th_off > 5 means this tcp packet have options field. 239 * The tcp options maybe always different. 240 * for example: 241 * From RFC 7323. 242 * TCP Timestamps option (TSopt): 243 * Kind: 8 244 * 245 * Length: 10 bytes 246 * 247 * +-------+-------+---------------------+---------------------+ 248 * |Kind=8 | 10 | TS Value (TSval) |TS Echo Reply (TSecr)| 249 * +-------+-------+---------------------+---------------------+ 250 * 1 1 4 4 251 * 252 * In this case the primary guest's timestamp always different with 253 * the secondary guest's timestamp. COLO just focus on payload, 254 * so we just need skip this field. 255 */ 256 if (ptcp->th_off > 5) { 257 ptrdiff_t tcp_offset; 258 tcp_offset = ppkt->transport_header - (uint8_t *)ppkt->data 259 + (ptcp->th_off * 4); 260 res = colo_packet_compare_common(ppkt, spkt, tcp_offset); 261 } else if (ptcp->th_sum == stcp->th_sum) { 262 res = colo_packet_compare_common(ppkt, spkt, ETH_HLEN); 263 } else { 264 res = -1; 265 } 266 267 if (res != 0 && trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 268 trace_colo_compare_pkt_info_src(inet_ntoa(ppkt->ip->ip_src), 269 ntohl(stcp->th_seq), 270 ntohl(stcp->th_ack), 271 res, stcp->th_flags, 272 spkt->size); 273 274 trace_colo_compare_pkt_info_dst(inet_ntoa(ppkt->ip->ip_dst), 275 ntohl(ptcp->th_seq), 276 ntohl(ptcp->th_ack), 277 res, ptcp->th_flags, 278 ppkt->size); 279 280 qemu_hexdump((char *)ppkt->data, stderr, 281 "colo-compare ppkt", ppkt->size); 282 qemu_hexdump((char *)spkt->data, stderr, 283 "colo-compare spkt", spkt->size); 284 } 285 286 return res; 287 } 288 289 /* 290 * Called from the compare thread on the primary 291 * for compare udp packet 292 */ 293 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 294 { 295 int ret; 296 int network_header_length = ppkt->ip->ip_hl * 4; 297 298 trace_colo_compare_main("compare udp"); 299 300 /* 301 * Because of ppkt and spkt are both in the same connection, 302 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 303 * same with spkt. In addition, IP header's Identification is a random 304 * field, we can handle it in IP fragmentation function later. 305 * COLO just concern the response net packet payload from primary guest 306 * and secondary guest are same or not, So we ignored all IP header include 307 * other field like TOS,TTL,IP Checksum. we only need to compare 308 * the ip payload here. 309 */ 310 ret = colo_packet_compare_common(ppkt, spkt, 311 network_header_length + ETH_HLEN); 312 313 if (ret) { 314 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 315 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 316 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 317 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 318 ppkt->size); 319 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 320 spkt->size); 321 } 322 } 323 324 return ret; 325 } 326 327 /* 328 * Called from the compare thread on the primary 329 * for compare icmp packet 330 */ 331 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 332 { 333 int network_header_length = ppkt->ip->ip_hl * 4; 334 335 trace_colo_compare_main("compare icmp"); 336 337 /* 338 * Because of ppkt and spkt are both in the same connection, 339 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 340 * same with spkt. In addition, IP header's Identification is a random 341 * field, we can handle it in IP fragmentation function later. 342 * COLO just concern the response net packet payload from primary guest 343 * and secondary guest are same or not, So we ignored all IP header include 344 * other field like TOS,TTL,IP Checksum. we only need to compare 345 * the ip payload here. 346 */ 347 if (colo_packet_compare_common(ppkt, spkt, 348 network_header_length + ETH_HLEN)) { 349 trace_colo_compare_icmp_miscompare("primary pkt size", 350 ppkt->size); 351 trace_colo_compare_icmp_miscompare("Secondary pkt size", 352 spkt->size); 353 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 354 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 355 ppkt->size); 356 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 357 spkt->size); 358 } 359 return -1; 360 } else { 361 return 0; 362 } 363 } 364 365 /* 366 * Called from the compare thread on the primary 367 * for compare other packet 368 */ 369 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 370 { 371 trace_colo_compare_main("compare other"); 372 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 373 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 374 375 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 376 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 377 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 378 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 379 380 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 381 pri_ip_dst, spkt->size, 382 sec_ip_src, sec_ip_dst); 383 } 384 385 return colo_packet_compare_common(ppkt, spkt, 0); 386 } 387 388 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 389 { 390 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 391 392 if ((now - pkt->creation_ms) > (*check_time)) { 393 trace_colo_old_packet_check_found(pkt->creation_ms); 394 return 0; 395 } else { 396 return 1; 397 } 398 } 399 400 static int colo_old_packet_check_one_conn(Connection *conn, 401 void *user_data) 402 { 403 GList *result = NULL; 404 int64_t check_time = REGULAR_PACKET_CHECK_MS; 405 406 result = g_queue_find_custom(&conn->primary_list, 407 &check_time, 408 (GCompareFunc)colo_old_packet_check_one); 409 410 if (result) { 411 /* do checkpoint will flush old packet */ 412 /* TODO: colo_notify_checkpoint();*/ 413 return 0; 414 } 415 416 return 1; 417 } 418 419 /* 420 * Look for old packets that the secondary hasn't matched, 421 * if we have some then we have to checkpoint to wake 422 * the secondary up. 423 */ 424 static void colo_old_packet_check(void *opaque) 425 { 426 CompareState *s = opaque; 427 428 /* 429 * If we find one old packet, stop finding job and notify 430 * COLO frame do checkpoint. 431 */ 432 g_queue_find_custom(&s->conn_list, NULL, 433 (GCompareFunc)colo_old_packet_check_one_conn); 434 } 435 436 /* 437 * Called from the compare thread on the primary 438 * for compare connection 439 */ 440 static void colo_compare_connection(void *opaque, void *user_data) 441 { 442 CompareState *s = user_data; 443 Connection *conn = opaque; 444 Packet *pkt = NULL; 445 GList *result = NULL; 446 int ret; 447 448 while (!g_queue_is_empty(&conn->primary_list) && 449 !g_queue_is_empty(&conn->secondary_list)) { 450 pkt = g_queue_pop_tail(&conn->primary_list); 451 switch (conn->ip_proto) { 452 case IPPROTO_TCP: 453 result = g_queue_find_custom(&conn->secondary_list, 454 pkt, (GCompareFunc)colo_packet_compare_tcp); 455 break; 456 case IPPROTO_UDP: 457 result = g_queue_find_custom(&conn->secondary_list, 458 pkt, (GCompareFunc)colo_packet_compare_udp); 459 break; 460 case IPPROTO_ICMP: 461 result = g_queue_find_custom(&conn->secondary_list, 462 pkt, (GCompareFunc)colo_packet_compare_icmp); 463 break; 464 default: 465 result = g_queue_find_custom(&conn->secondary_list, 466 pkt, (GCompareFunc)colo_packet_compare_other); 467 break; 468 } 469 470 if (result) { 471 ret = compare_chr_send(&s->chr_out, pkt->data, pkt->size); 472 if (ret < 0) { 473 error_report("colo_send_primary_packet failed"); 474 } 475 trace_colo_compare_main("packet same and release packet"); 476 g_queue_remove(&conn->secondary_list, result->data); 477 packet_destroy(pkt, NULL); 478 } else { 479 /* 480 * If one packet arrive late, the secondary_list or 481 * primary_list will be empty, so we can't compare it 482 * until next comparison. 483 */ 484 trace_colo_compare_main("packet different"); 485 g_queue_push_tail(&conn->primary_list, pkt); 486 /* TODO: colo_notify_checkpoint();*/ 487 break; 488 } 489 } 490 } 491 492 static int compare_chr_send(CharBackend *out, 493 const uint8_t *buf, 494 uint32_t size) 495 { 496 int ret = 0; 497 uint32_t len = htonl(size); 498 499 if (!size) { 500 return 0; 501 } 502 503 ret = qemu_chr_fe_write_all(out, (uint8_t *)&len, sizeof(len)); 504 if (ret != sizeof(len)) { 505 goto err; 506 } 507 508 ret = qemu_chr_fe_write_all(out, (uint8_t *)buf, size); 509 if (ret != size) { 510 goto err; 511 } 512 513 return 0; 514 515 err: 516 return ret < 0 ? ret : -EIO; 517 } 518 519 static int compare_chr_can_read(void *opaque) 520 { 521 return COMPARE_READ_LEN_MAX; 522 } 523 524 /* 525 * Called from the main thread on the primary for packets 526 * arriving over the socket from the primary. 527 */ 528 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 529 { 530 CompareState *s = COLO_COMPARE(opaque); 531 int ret; 532 533 ret = net_fill_rstate(&s->pri_rs, buf, size); 534 if (ret == -1) { 535 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, 536 NULL, NULL, true); 537 error_report("colo-compare primary_in error"); 538 } 539 } 540 541 /* 542 * Called from the main thread on the primary for packets 543 * arriving over the socket from the secondary. 544 */ 545 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 546 { 547 CompareState *s = COLO_COMPARE(opaque); 548 int ret; 549 550 ret = net_fill_rstate(&s->sec_rs, buf, size); 551 if (ret == -1) { 552 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, 553 NULL, NULL, true); 554 error_report("colo-compare secondary_in error"); 555 } 556 } 557 558 /* 559 * Check old packet regularly so it can watch for any packets 560 * that the secondary hasn't produced equivalents of. 561 */ 562 static gboolean check_old_packet_regular(void *opaque) 563 { 564 CompareState *s = opaque; 565 566 /* if have old packet we will notify checkpoint */ 567 colo_old_packet_check(s); 568 569 return TRUE; 570 } 571 572 static void *colo_compare_thread(void *opaque) 573 { 574 CompareState *s = opaque; 575 GSource *timeout_source; 576 577 s->worker_context = g_main_context_new(); 578 579 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 580 compare_pri_chr_in, NULL, s, s->worker_context, true); 581 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 582 compare_sec_chr_in, NULL, s, s->worker_context, true); 583 584 s->compare_loop = g_main_loop_new(s->worker_context, FALSE); 585 586 /* To kick any packets that the secondary doesn't match */ 587 timeout_source = g_timeout_source_new(REGULAR_PACKET_CHECK_MS); 588 g_source_set_callback(timeout_source, 589 (GSourceFunc)check_old_packet_regular, s, NULL); 590 g_source_attach(timeout_source, s->worker_context); 591 592 g_main_loop_run(s->compare_loop); 593 594 g_source_unref(timeout_source); 595 g_main_loop_unref(s->compare_loop); 596 g_main_context_unref(s->worker_context); 597 return NULL; 598 } 599 600 static char *compare_get_pri_indev(Object *obj, Error **errp) 601 { 602 CompareState *s = COLO_COMPARE(obj); 603 604 return g_strdup(s->pri_indev); 605 } 606 607 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 608 { 609 CompareState *s = COLO_COMPARE(obj); 610 611 g_free(s->pri_indev); 612 s->pri_indev = g_strdup(value); 613 } 614 615 static char *compare_get_sec_indev(Object *obj, Error **errp) 616 { 617 CompareState *s = COLO_COMPARE(obj); 618 619 return g_strdup(s->sec_indev); 620 } 621 622 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 623 { 624 CompareState *s = COLO_COMPARE(obj); 625 626 g_free(s->sec_indev); 627 s->sec_indev = g_strdup(value); 628 } 629 630 static char *compare_get_outdev(Object *obj, Error **errp) 631 { 632 CompareState *s = COLO_COMPARE(obj); 633 634 return g_strdup(s->outdev); 635 } 636 637 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 638 { 639 CompareState *s = COLO_COMPARE(obj); 640 641 g_free(s->outdev); 642 s->outdev = g_strdup(value); 643 } 644 645 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 646 { 647 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 648 649 if (packet_enqueue(s, PRIMARY_IN)) { 650 trace_colo_compare_main("primary: unsupported packet in"); 651 compare_chr_send(&s->chr_out, pri_rs->buf, pri_rs->packet_len); 652 } else { 653 /* compare connection */ 654 g_queue_foreach(&s->conn_list, colo_compare_connection, s); 655 } 656 } 657 658 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 659 { 660 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 661 662 if (packet_enqueue(s, SECONDARY_IN)) { 663 trace_colo_compare_main("secondary: unsupported packet in"); 664 } else { 665 /* compare connection */ 666 g_queue_foreach(&s->conn_list, colo_compare_connection, s); 667 } 668 } 669 670 671 /* 672 * Return 0 is success. 673 * Return 1 is failed. 674 */ 675 static int find_and_check_chardev(Chardev **chr, 676 char *chr_name, 677 Error **errp) 678 { 679 *chr = qemu_chr_find(chr_name); 680 if (*chr == NULL) { 681 error_setg(errp, "Device '%s' not found", 682 chr_name); 683 return 1; 684 } 685 686 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 687 error_setg(errp, "chardev \"%s\" is not reconnectable", 688 chr_name); 689 return 1; 690 } 691 692 return 0; 693 } 694 695 /* 696 * Called from the main thread on the primary 697 * to setup colo-compare. 698 */ 699 static void colo_compare_complete(UserCreatable *uc, Error **errp) 700 { 701 CompareState *s = COLO_COMPARE(uc); 702 Chardev *chr; 703 char thread_name[64]; 704 static int compare_id; 705 706 if (!s->pri_indev || !s->sec_indev || !s->outdev) { 707 error_setg(errp, "colo compare needs 'primary_in' ," 708 "'secondary_in','outdev' property set"); 709 return; 710 } else if (!strcmp(s->pri_indev, s->outdev) || 711 !strcmp(s->sec_indev, s->outdev) || 712 !strcmp(s->pri_indev, s->sec_indev)) { 713 error_setg(errp, "'indev' and 'outdev' could not be same " 714 "for compare module"); 715 return; 716 } 717 718 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 719 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 720 return; 721 } 722 723 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 724 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 725 return; 726 } 727 728 if (find_and_check_chardev(&chr, s->outdev, errp) || 729 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 730 return; 731 } 732 733 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize); 734 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize); 735 736 g_queue_init(&s->conn_list); 737 738 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 739 connection_key_equal, 740 g_free, 741 connection_destroy); 742 743 sprintf(thread_name, "colo-compare %d", compare_id); 744 qemu_thread_create(&s->thread, thread_name, 745 colo_compare_thread, s, 746 QEMU_THREAD_JOINABLE); 747 compare_id++; 748 749 return; 750 } 751 752 static void colo_flush_packets(void *opaque, void *user_data) 753 { 754 CompareState *s = user_data; 755 Connection *conn = opaque; 756 Packet *pkt = NULL; 757 758 while (!g_queue_is_empty(&conn->primary_list)) { 759 pkt = g_queue_pop_head(&conn->primary_list); 760 compare_chr_send(&s->chr_out, pkt->data, pkt->size); 761 packet_destroy(pkt, NULL); 762 } 763 while (!g_queue_is_empty(&conn->secondary_list)) { 764 pkt = g_queue_pop_head(&conn->secondary_list); 765 packet_destroy(pkt, NULL); 766 } 767 } 768 769 static void colo_compare_class_init(ObjectClass *oc, void *data) 770 { 771 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 772 773 ucc->complete = colo_compare_complete; 774 } 775 776 static void colo_compare_init(Object *obj) 777 { 778 object_property_add_str(obj, "primary_in", 779 compare_get_pri_indev, compare_set_pri_indev, 780 NULL); 781 object_property_add_str(obj, "secondary_in", 782 compare_get_sec_indev, compare_set_sec_indev, 783 NULL); 784 object_property_add_str(obj, "outdev", 785 compare_get_outdev, compare_set_outdev, 786 NULL); 787 } 788 789 static void colo_compare_finalize(Object *obj) 790 { 791 CompareState *s = COLO_COMPARE(obj); 792 793 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 794 s->worker_context, true); 795 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 796 s->worker_context, true); 797 qemu_chr_fe_deinit(&s->chr_out); 798 799 g_main_loop_quit(s->compare_loop); 800 qemu_thread_join(&s->thread); 801 802 /* Release all unhandled packets after compare thead exited */ 803 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 804 805 g_queue_clear(&s->conn_list); 806 807 g_hash_table_destroy(s->connection_track_table); 808 g_free(s->pri_indev); 809 g_free(s->sec_indev); 810 g_free(s->outdev); 811 } 812 813 static const TypeInfo colo_compare_info = { 814 .name = TYPE_COLO_COMPARE, 815 .parent = TYPE_OBJECT, 816 .instance_size = sizeof(CompareState), 817 .instance_init = colo_compare_init, 818 .instance_finalize = colo_compare_finalize, 819 .class_size = sizeof(CompareClass), 820 .class_init = colo_compare_class_init, 821 .interfaces = (InterfaceInfo[]) { 822 { TYPE_USER_CREATABLE }, 823 { } 824 } 825 }; 826 827 static void register_types(void) 828 { 829 type_register_static(&colo_compare_info); 830 } 831 832 type_init(register_types); 833