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 && trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 268 char ip_src[20], ip_dst[20]; 269 270 strcpy(ip_src, inet_ntoa(ppkt->ip->ip_src)); 271 strcpy(ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 272 273 trace_colo_compare_tcp_info(ip_src, 274 ip_dst, 275 ntohl(ptcp->th_seq), 276 ntohl(stcp->th_seq), 277 ntohl(ptcp->th_ack), 278 ntohl(stcp->th_ack), 279 res, 280 ptcp->th_flags, 281 stcp->th_flags, 282 ppkt->size, 283 spkt->size); 284 285 qemu_hexdump((char *)ppkt->data, stderr, 286 "colo-compare ppkt", ppkt->size); 287 qemu_hexdump((char *)spkt->data, stderr, 288 "colo-compare spkt", spkt->size); 289 } 290 291 return res; 292 } 293 294 /* 295 * Called from the compare thread on the primary 296 * for compare udp packet 297 */ 298 static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt) 299 { 300 int ret; 301 int network_header_length = ppkt->ip->ip_hl * 4; 302 303 trace_colo_compare_main("compare udp"); 304 305 /* 306 * Because of ppkt and spkt are both in the same connection, 307 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 308 * same with spkt. In addition, IP header's Identification is a random 309 * field, we can handle it in IP fragmentation function later. 310 * COLO just concern the response net packet payload from primary guest 311 * and secondary guest are same or not, So we ignored all IP header include 312 * other field like TOS,TTL,IP Checksum. we only need to compare 313 * the ip payload here. 314 */ 315 ret = colo_packet_compare_common(ppkt, spkt, 316 network_header_length + ETH_HLEN); 317 318 if (ret) { 319 trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size); 320 trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size); 321 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 322 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 323 ppkt->size); 324 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 325 spkt->size); 326 } 327 } 328 329 return ret; 330 } 331 332 /* 333 * Called from the compare thread on the primary 334 * for compare icmp packet 335 */ 336 static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt) 337 { 338 int network_header_length = ppkt->ip->ip_hl * 4; 339 340 trace_colo_compare_main("compare icmp"); 341 342 /* 343 * Because of ppkt and spkt are both in the same connection, 344 * The ppkt's src ip, dst ip, src port, dst port, ip_proto all are 345 * same with spkt. In addition, IP header's Identification is a random 346 * field, we can handle it in IP fragmentation function later. 347 * COLO just concern the response net packet payload from primary guest 348 * and secondary guest are same or not, So we ignored all IP header include 349 * other field like TOS,TTL,IP Checksum. we only need to compare 350 * the ip payload here. 351 */ 352 if (colo_packet_compare_common(ppkt, spkt, 353 network_header_length + ETH_HLEN)) { 354 trace_colo_compare_icmp_miscompare("primary pkt size", 355 ppkt->size); 356 trace_colo_compare_icmp_miscompare("Secondary pkt size", 357 spkt->size); 358 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 359 qemu_hexdump((char *)ppkt->data, stderr, "colo-compare pri pkt", 360 ppkt->size); 361 qemu_hexdump((char *)spkt->data, stderr, "colo-compare sec pkt", 362 spkt->size); 363 } 364 return -1; 365 } else { 366 return 0; 367 } 368 } 369 370 /* 371 * Called from the compare thread on the primary 372 * for compare other packet 373 */ 374 static int colo_packet_compare_other(Packet *spkt, Packet *ppkt) 375 { 376 trace_colo_compare_main("compare other"); 377 if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) { 378 char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20]; 379 380 strcpy(pri_ip_src, inet_ntoa(ppkt->ip->ip_src)); 381 strcpy(pri_ip_dst, inet_ntoa(ppkt->ip->ip_dst)); 382 strcpy(sec_ip_src, inet_ntoa(spkt->ip->ip_src)); 383 strcpy(sec_ip_dst, inet_ntoa(spkt->ip->ip_dst)); 384 385 trace_colo_compare_ip_info(ppkt->size, pri_ip_src, 386 pri_ip_dst, spkt->size, 387 sec_ip_src, sec_ip_dst); 388 } 389 390 return colo_packet_compare_common(ppkt, spkt, 0); 391 } 392 393 static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time) 394 { 395 int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST); 396 397 if ((now - pkt->creation_ms) > (*check_time)) { 398 trace_colo_old_packet_check_found(pkt->creation_ms); 399 return 0; 400 } else { 401 return 1; 402 } 403 } 404 405 static int colo_old_packet_check_one_conn(Connection *conn, 406 void *user_data) 407 { 408 GList *result = NULL; 409 int64_t check_time = REGULAR_PACKET_CHECK_MS; 410 411 result = g_queue_find_custom(&conn->primary_list, 412 &check_time, 413 (GCompareFunc)colo_old_packet_check_one); 414 415 if (result) { 416 /* do checkpoint will flush old packet */ 417 /* TODO: colo_notify_checkpoint();*/ 418 return 0; 419 } 420 421 return 1; 422 } 423 424 /* 425 * Look for old packets that the secondary hasn't matched, 426 * if we have some then we have to checkpoint to wake 427 * the secondary up. 428 */ 429 static void colo_old_packet_check(void *opaque) 430 { 431 CompareState *s = opaque; 432 433 /* 434 * If we find one old packet, stop finding job and notify 435 * COLO frame do checkpoint. 436 */ 437 g_queue_find_custom(&s->conn_list, NULL, 438 (GCompareFunc)colo_old_packet_check_one_conn); 439 } 440 441 /* 442 * Called from the compare thread on the primary 443 * for compare connection 444 */ 445 static void colo_compare_connection(void *opaque, void *user_data) 446 { 447 CompareState *s = user_data; 448 Connection *conn = opaque; 449 Packet *pkt = NULL; 450 GList *result = NULL; 451 int ret; 452 453 while (!g_queue_is_empty(&conn->primary_list) && 454 !g_queue_is_empty(&conn->secondary_list)) { 455 pkt = g_queue_pop_tail(&conn->primary_list); 456 switch (conn->ip_proto) { 457 case IPPROTO_TCP: 458 result = g_queue_find_custom(&conn->secondary_list, 459 pkt, (GCompareFunc)colo_packet_compare_tcp); 460 break; 461 case IPPROTO_UDP: 462 result = g_queue_find_custom(&conn->secondary_list, 463 pkt, (GCompareFunc)colo_packet_compare_udp); 464 break; 465 case IPPROTO_ICMP: 466 result = g_queue_find_custom(&conn->secondary_list, 467 pkt, (GCompareFunc)colo_packet_compare_icmp); 468 break; 469 default: 470 result = g_queue_find_custom(&conn->secondary_list, 471 pkt, (GCompareFunc)colo_packet_compare_other); 472 break; 473 } 474 475 if (result) { 476 ret = compare_chr_send(&s->chr_out, pkt->data, pkt->size); 477 if (ret < 0) { 478 error_report("colo_send_primary_packet failed"); 479 } 480 trace_colo_compare_main("packet same and release packet"); 481 g_queue_remove(&conn->secondary_list, result->data); 482 packet_destroy(pkt, NULL); 483 } else { 484 /* 485 * If one packet arrive late, the secondary_list or 486 * primary_list will be empty, so we can't compare it 487 * until next comparison. 488 */ 489 trace_colo_compare_main("packet different"); 490 g_queue_push_tail(&conn->primary_list, pkt); 491 /* TODO: colo_notify_checkpoint();*/ 492 break; 493 } 494 } 495 } 496 497 static int compare_chr_send(CharBackend *out, 498 const uint8_t *buf, 499 uint32_t size) 500 { 501 int ret = 0; 502 uint32_t len = htonl(size); 503 504 if (!size) { 505 return 0; 506 } 507 508 ret = qemu_chr_fe_write_all(out, (uint8_t *)&len, sizeof(len)); 509 if (ret != sizeof(len)) { 510 goto err; 511 } 512 513 ret = qemu_chr_fe_write_all(out, (uint8_t *)buf, size); 514 if (ret != size) { 515 goto err; 516 } 517 518 return 0; 519 520 err: 521 return ret < 0 ? ret : -EIO; 522 } 523 524 static int compare_chr_can_read(void *opaque) 525 { 526 return COMPARE_READ_LEN_MAX; 527 } 528 529 /* 530 * Called from the main thread on the primary for packets 531 * arriving over the socket from the primary. 532 */ 533 static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size) 534 { 535 CompareState *s = COLO_COMPARE(opaque); 536 int ret; 537 538 ret = net_fill_rstate(&s->pri_rs, buf, size); 539 if (ret == -1) { 540 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, 541 NULL, NULL, true); 542 error_report("colo-compare primary_in error"); 543 } 544 } 545 546 /* 547 * Called from the main thread on the primary for packets 548 * arriving over the socket from the secondary. 549 */ 550 static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size) 551 { 552 CompareState *s = COLO_COMPARE(opaque); 553 int ret; 554 555 ret = net_fill_rstate(&s->sec_rs, buf, size); 556 if (ret == -1) { 557 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, 558 NULL, NULL, true); 559 error_report("colo-compare secondary_in error"); 560 } 561 } 562 563 /* 564 * Check old packet regularly so it can watch for any packets 565 * that the secondary hasn't produced equivalents of. 566 */ 567 static gboolean check_old_packet_regular(void *opaque) 568 { 569 CompareState *s = opaque; 570 571 /* if have old packet we will notify checkpoint */ 572 colo_old_packet_check(s); 573 574 return TRUE; 575 } 576 577 static void *colo_compare_thread(void *opaque) 578 { 579 CompareState *s = opaque; 580 GSource *timeout_source; 581 582 s->worker_context = g_main_context_new(); 583 584 qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read, 585 compare_pri_chr_in, NULL, s, s->worker_context, true); 586 qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read, 587 compare_sec_chr_in, NULL, s, s->worker_context, true); 588 589 s->compare_loop = g_main_loop_new(s->worker_context, FALSE); 590 591 /* To kick any packets that the secondary doesn't match */ 592 timeout_source = g_timeout_source_new(REGULAR_PACKET_CHECK_MS); 593 g_source_set_callback(timeout_source, 594 (GSourceFunc)check_old_packet_regular, s, NULL); 595 g_source_attach(timeout_source, s->worker_context); 596 597 g_main_loop_run(s->compare_loop); 598 599 g_source_unref(timeout_source); 600 g_main_loop_unref(s->compare_loop); 601 g_main_context_unref(s->worker_context); 602 return NULL; 603 } 604 605 static char *compare_get_pri_indev(Object *obj, Error **errp) 606 { 607 CompareState *s = COLO_COMPARE(obj); 608 609 return g_strdup(s->pri_indev); 610 } 611 612 static void compare_set_pri_indev(Object *obj, const char *value, Error **errp) 613 { 614 CompareState *s = COLO_COMPARE(obj); 615 616 g_free(s->pri_indev); 617 s->pri_indev = g_strdup(value); 618 } 619 620 static char *compare_get_sec_indev(Object *obj, Error **errp) 621 { 622 CompareState *s = COLO_COMPARE(obj); 623 624 return g_strdup(s->sec_indev); 625 } 626 627 static void compare_set_sec_indev(Object *obj, const char *value, Error **errp) 628 { 629 CompareState *s = COLO_COMPARE(obj); 630 631 g_free(s->sec_indev); 632 s->sec_indev = g_strdup(value); 633 } 634 635 static char *compare_get_outdev(Object *obj, Error **errp) 636 { 637 CompareState *s = COLO_COMPARE(obj); 638 639 return g_strdup(s->outdev); 640 } 641 642 static void compare_set_outdev(Object *obj, const char *value, Error **errp) 643 { 644 CompareState *s = COLO_COMPARE(obj); 645 646 g_free(s->outdev); 647 s->outdev = g_strdup(value); 648 } 649 650 static void compare_pri_rs_finalize(SocketReadState *pri_rs) 651 { 652 CompareState *s = container_of(pri_rs, CompareState, pri_rs); 653 654 if (packet_enqueue(s, PRIMARY_IN)) { 655 trace_colo_compare_main("primary: unsupported packet in"); 656 compare_chr_send(&s->chr_out, pri_rs->buf, pri_rs->packet_len); 657 } else { 658 /* compare connection */ 659 g_queue_foreach(&s->conn_list, colo_compare_connection, s); 660 } 661 } 662 663 static void compare_sec_rs_finalize(SocketReadState *sec_rs) 664 { 665 CompareState *s = container_of(sec_rs, CompareState, sec_rs); 666 667 if (packet_enqueue(s, SECONDARY_IN)) { 668 trace_colo_compare_main("secondary: unsupported packet in"); 669 } else { 670 /* compare connection */ 671 g_queue_foreach(&s->conn_list, colo_compare_connection, s); 672 } 673 } 674 675 676 /* 677 * Return 0 is success. 678 * Return 1 is failed. 679 */ 680 static int find_and_check_chardev(Chardev **chr, 681 char *chr_name, 682 Error **errp) 683 { 684 *chr = qemu_chr_find(chr_name); 685 if (*chr == NULL) { 686 error_setg(errp, "Device '%s' not found", 687 chr_name); 688 return 1; 689 } 690 691 if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { 692 error_setg(errp, "chardev \"%s\" is not reconnectable", 693 chr_name); 694 return 1; 695 } 696 697 return 0; 698 } 699 700 /* 701 * Called from the main thread on the primary 702 * to setup colo-compare. 703 */ 704 static void colo_compare_complete(UserCreatable *uc, Error **errp) 705 { 706 CompareState *s = COLO_COMPARE(uc); 707 Chardev *chr; 708 char thread_name[64]; 709 static int compare_id; 710 711 if (!s->pri_indev || !s->sec_indev || !s->outdev) { 712 error_setg(errp, "colo compare needs 'primary_in' ," 713 "'secondary_in','outdev' property set"); 714 return; 715 } else if (!strcmp(s->pri_indev, s->outdev) || 716 !strcmp(s->sec_indev, s->outdev) || 717 !strcmp(s->pri_indev, s->sec_indev)) { 718 error_setg(errp, "'indev' and 'outdev' could not be same " 719 "for compare module"); 720 return; 721 } 722 723 if (find_and_check_chardev(&chr, s->pri_indev, errp) || 724 !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) { 725 return; 726 } 727 728 if (find_and_check_chardev(&chr, s->sec_indev, errp) || 729 !qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) { 730 return; 731 } 732 733 if (find_and_check_chardev(&chr, s->outdev, errp) || 734 !qemu_chr_fe_init(&s->chr_out, chr, errp)) { 735 return; 736 } 737 738 net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize); 739 net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize); 740 741 g_queue_init(&s->conn_list); 742 743 s->connection_track_table = g_hash_table_new_full(connection_key_hash, 744 connection_key_equal, 745 g_free, 746 connection_destroy); 747 748 sprintf(thread_name, "colo-compare %d", compare_id); 749 qemu_thread_create(&s->thread, thread_name, 750 colo_compare_thread, s, 751 QEMU_THREAD_JOINABLE); 752 compare_id++; 753 754 return; 755 } 756 757 static void colo_flush_packets(void *opaque, void *user_data) 758 { 759 CompareState *s = user_data; 760 Connection *conn = opaque; 761 Packet *pkt = NULL; 762 763 while (!g_queue_is_empty(&conn->primary_list)) { 764 pkt = g_queue_pop_head(&conn->primary_list); 765 compare_chr_send(&s->chr_out, pkt->data, pkt->size); 766 packet_destroy(pkt, NULL); 767 } 768 while (!g_queue_is_empty(&conn->secondary_list)) { 769 pkt = g_queue_pop_head(&conn->secondary_list); 770 packet_destroy(pkt, NULL); 771 } 772 } 773 774 static void colo_compare_class_init(ObjectClass *oc, void *data) 775 { 776 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); 777 778 ucc->complete = colo_compare_complete; 779 } 780 781 static void colo_compare_init(Object *obj) 782 { 783 object_property_add_str(obj, "primary_in", 784 compare_get_pri_indev, compare_set_pri_indev, 785 NULL); 786 object_property_add_str(obj, "secondary_in", 787 compare_get_sec_indev, compare_set_sec_indev, 788 NULL); 789 object_property_add_str(obj, "outdev", 790 compare_get_outdev, compare_set_outdev, 791 NULL); 792 } 793 794 static void colo_compare_finalize(Object *obj) 795 { 796 CompareState *s = COLO_COMPARE(obj); 797 798 qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL, NULL, 799 s->worker_context, true); 800 qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL, NULL, 801 s->worker_context, true); 802 qemu_chr_fe_deinit(&s->chr_out); 803 804 g_main_loop_quit(s->compare_loop); 805 qemu_thread_join(&s->thread); 806 807 /* Release all unhandled packets after compare thead exited */ 808 g_queue_foreach(&s->conn_list, colo_flush_packets, s); 809 810 g_queue_clear(&s->conn_list); 811 812 g_hash_table_destroy(s->connection_track_table); 813 g_free(s->pri_indev); 814 g_free(s->sec_indev); 815 g_free(s->outdev); 816 } 817 818 static const TypeInfo colo_compare_info = { 819 .name = TYPE_COLO_COMPARE, 820 .parent = TYPE_OBJECT, 821 .instance_size = sizeof(CompareState), 822 .instance_init = colo_compare_init, 823 .instance_finalize = colo_compare_finalize, 824 .class_size = sizeof(CompareClass), 825 .class_init = colo_compare_class_init, 826 .interfaces = (InterfaceInfo[]) { 827 { TYPE_USER_CREATABLE }, 828 { } 829 } 830 }; 831 832 static void register_types(void) 833 { 834 type_register_static(&colo_compare_info); 835 } 836 837 type_init(register_types); 838