Pick a uniform chardev type name. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
738 lines
22 KiB
C
738 lines
22 KiB
C
/*
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* COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
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* (a.k.a. Fault Tolerance or Continuous Replication)
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*
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* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
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* Copyright (c) 2016 FUJITSU LIMITED
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* Copyright (c) 2016 Intel Corporation
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*
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* Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/error-report.h"
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#include "trace.h"
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#include "qemu-common.h"
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#include "qapi/qmp/qerror.h"
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#include "qapi/error.h"
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#include "net/net.h"
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#include "net/eth.h"
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#include "qom/object_interfaces.h"
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#include "qemu/iov.h"
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#include "qom/object.h"
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#include "qemu/typedefs.h"
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#include "net/queue.h"
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#include "sysemu/char.h"
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#include "qemu/sockets.h"
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#include "qapi-visit.h"
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#include "net/colo.h"
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#define TYPE_COLO_COMPARE "colo-compare"
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#define COLO_COMPARE(obj) \
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OBJECT_CHECK(CompareState, (obj), TYPE_COLO_COMPARE)
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#define COMPARE_READ_LEN_MAX NET_BUFSIZE
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#define MAX_QUEUE_SIZE 1024
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/* TODO: Should be configurable */
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#define REGULAR_PACKET_CHECK_MS 3000
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/*
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+ CompareState ++
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| |
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+---------------+ +---------------+ +---------------+
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|conn list +--->conn +--------->conn |
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+---------------+ +---------------+ +---------------+
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| | | | | |
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+---------------+ +---v----+ +---v----+ +---v----+ +---v----+
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|primary | |secondary |primary | |secondary
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|packet | |packet + |packet | |packet +
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+--------+ +--------+ +--------+ +--------+
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| | | |
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+---v----+ +---v----+ +---v----+ +---v----+
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|primary | |secondary |primary | |secondary
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|packet | |packet + |packet | |packet +
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+--------+ +--------+ +--------+ +--------+
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| | | |
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+---v----+ +---v----+ +---v----+ +---v----+
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|primary | |secondary |primary | |secondary
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|packet | |packet + |packet | |packet +
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+--------+ +--------+ +--------+ +--------+
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*/
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typedef struct CompareState {
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Object parent;
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char *pri_indev;
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char *sec_indev;
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char *outdev;
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CharBackend chr_pri_in;
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CharBackend chr_sec_in;
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CharBackend chr_out;
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SocketReadState pri_rs;
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SocketReadState sec_rs;
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/* connection list: the connections belonged to this NIC could be found
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* in this list.
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* element type: Connection
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*/
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GQueue conn_list;
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/* hashtable to save connection */
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GHashTable *connection_track_table;
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/* compare thread, a thread for each NIC */
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QemuThread thread;
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/* Timer used on the primary to find packets that are never matched */
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QEMUTimer *timer;
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QemuMutex timer_check_lock;
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} CompareState;
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typedef struct CompareClass {
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ObjectClass parent_class;
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} CompareClass;
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enum {
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PRIMARY_IN = 0,
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SECONDARY_IN,
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};
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static int compare_chr_send(CharBackend *out,
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const uint8_t *buf,
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uint32_t size);
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/*
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* Return 0 on success, if return -1 means the pkt
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* is unsupported(arp and ipv6) and will be sent later
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*/
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static int packet_enqueue(CompareState *s, int mode)
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{
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ConnectionKey key;
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Packet *pkt = NULL;
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Connection *conn;
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if (mode == PRIMARY_IN) {
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pkt = packet_new(s->pri_rs.buf, s->pri_rs.packet_len);
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} else {
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pkt = packet_new(s->sec_rs.buf, s->sec_rs.packet_len);
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}
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if (parse_packet_early(pkt)) {
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packet_destroy(pkt, NULL);
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pkt = NULL;
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return -1;
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}
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fill_connection_key(pkt, &key);
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conn = connection_get(s->connection_track_table,
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&key,
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&s->conn_list);
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if (!conn->processing) {
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g_queue_push_tail(&s->conn_list, conn);
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conn->processing = true;
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}
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if (mode == PRIMARY_IN) {
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if (g_queue_get_length(&conn->primary_list) <=
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MAX_QUEUE_SIZE) {
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g_queue_push_tail(&conn->primary_list, pkt);
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} else {
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error_report("colo compare primary queue size too big,"
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"drop packet");
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}
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} else {
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if (g_queue_get_length(&conn->secondary_list) <=
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MAX_QUEUE_SIZE) {
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g_queue_push_tail(&conn->secondary_list, pkt);
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} else {
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error_report("colo compare secondary queue size too big,"
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"drop packet");
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}
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}
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return 0;
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}
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/*
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* The IP packets sent by primary and secondary
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* will be compared in here
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* TODO support ip fragment, Out-Of-Order
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* return: 0 means packet same
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* > 0 || < 0 means packet different
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*/
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static int colo_packet_compare(Packet *ppkt, Packet *spkt)
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{
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trace_colo_compare_ip_info(ppkt->size, inet_ntoa(ppkt->ip->ip_src),
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inet_ntoa(ppkt->ip->ip_dst), spkt->size,
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inet_ntoa(spkt->ip->ip_src),
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inet_ntoa(spkt->ip->ip_dst));
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if (ppkt->size == spkt->size) {
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return memcmp(ppkt->data, spkt->data, spkt->size);
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} else {
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return -1;
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}
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}
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/*
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* Called from the compare thread on the primary
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* for compare tcp packet
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* compare_tcp copied from Dr. David Alan Gilbert's branch
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*/
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static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt)
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{
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struct tcphdr *ptcp, *stcp;
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int res;
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trace_colo_compare_main("compare tcp");
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if (ppkt->size != spkt->size) {
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if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) {
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trace_colo_compare_main("pkt size not same");
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}
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return -1;
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}
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ptcp = (struct tcphdr *)ppkt->transport_header;
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stcp = (struct tcphdr *)spkt->transport_header;
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/*
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* The 'identification' field in the IP header is *very* random
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* it almost never matches. Fudge this by ignoring differences in
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* unfragmented packets; they'll normally sort themselves out if different
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* anyway, and it should recover at the TCP level.
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* An alternative would be to get both the primary and secondary to rewrite
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* somehow; but that would need some sync traffic to sync the state
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*/
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if (ntohs(ppkt->ip->ip_off) & IP_DF) {
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spkt->ip->ip_id = ppkt->ip->ip_id;
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/* and the sum will be different if the IDs were different */
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spkt->ip->ip_sum = ppkt->ip->ip_sum;
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}
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res = memcmp(ppkt->data + ETH_HLEN, spkt->data + ETH_HLEN,
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(spkt->size - ETH_HLEN));
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if (res != 0 && trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) {
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trace_colo_compare_pkt_info_src(inet_ntoa(ppkt->ip->ip_src),
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ntohl(stcp->th_seq),
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ntohl(stcp->th_ack),
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res, stcp->th_flags,
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spkt->size);
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trace_colo_compare_pkt_info_dst(inet_ntoa(ppkt->ip->ip_dst),
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ntohl(ptcp->th_seq),
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ntohl(ptcp->th_ack),
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res, ptcp->th_flags,
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ppkt->size);
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qemu_hexdump((char *)ppkt->data, stderr,
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"colo-compare ppkt", ppkt->size);
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qemu_hexdump((char *)spkt->data, stderr,
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"colo-compare spkt", spkt->size);
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}
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return res;
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}
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/*
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* Called from the compare thread on the primary
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* for compare udp packet
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*/
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static int colo_packet_compare_udp(Packet *spkt, Packet *ppkt)
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{
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int ret;
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trace_colo_compare_main("compare udp");
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ret = colo_packet_compare(ppkt, spkt);
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if (ret) {
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trace_colo_compare_udp_miscompare("primary pkt size", ppkt->size);
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qemu_hexdump((char *)ppkt->data, stderr, "colo-compare", ppkt->size);
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trace_colo_compare_udp_miscompare("Secondary pkt size", spkt->size);
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qemu_hexdump((char *)spkt->data, stderr, "colo-compare", spkt->size);
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}
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return ret;
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}
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/*
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* Called from the compare thread on the primary
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* for compare icmp packet
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*/
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static int colo_packet_compare_icmp(Packet *spkt, Packet *ppkt)
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{
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int network_length;
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trace_colo_compare_main("compare icmp");
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network_length = ppkt->ip->ip_hl * 4;
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if (ppkt->size != spkt->size ||
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ppkt->size < network_length + ETH_HLEN) {
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return -1;
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}
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if (colo_packet_compare(ppkt, spkt)) {
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trace_colo_compare_icmp_miscompare("primary pkt size",
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ppkt->size);
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qemu_hexdump((char *)ppkt->data, stderr, "colo-compare",
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ppkt->size);
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trace_colo_compare_icmp_miscompare("Secondary pkt size",
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spkt->size);
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qemu_hexdump((char *)spkt->data, stderr, "colo-compare",
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spkt->size);
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return -1;
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} else {
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return 0;
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}
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}
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/*
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* Called from the compare thread on the primary
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* for compare other packet
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*/
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static int colo_packet_compare_other(Packet *spkt, Packet *ppkt)
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{
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trace_colo_compare_main("compare other");
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trace_colo_compare_ip_info(ppkt->size, inet_ntoa(ppkt->ip->ip_src),
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inet_ntoa(ppkt->ip->ip_dst), spkt->size,
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inet_ntoa(spkt->ip->ip_src),
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inet_ntoa(spkt->ip->ip_dst));
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return colo_packet_compare(ppkt, spkt);
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}
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static int colo_old_packet_check_one(Packet *pkt, int64_t *check_time)
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{
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int64_t now = qemu_clock_get_ms(QEMU_CLOCK_HOST);
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if ((now - pkt->creation_ms) > (*check_time)) {
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trace_colo_old_packet_check_found(pkt->creation_ms);
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return 0;
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} else {
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return 1;
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}
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}
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static void colo_old_packet_check_one_conn(void *opaque,
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void *user_data)
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{
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Connection *conn = opaque;
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GList *result = NULL;
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int64_t check_time = REGULAR_PACKET_CHECK_MS;
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result = g_queue_find_custom(&conn->primary_list,
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&check_time,
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(GCompareFunc)colo_old_packet_check_one);
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if (result) {
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/* do checkpoint will flush old packet */
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/* TODO: colo_notify_checkpoint();*/
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}
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}
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/*
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* Look for old packets that the secondary hasn't matched,
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* if we have some then we have to checkpoint to wake
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* the secondary up.
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*/
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static void colo_old_packet_check(void *opaque)
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{
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CompareState *s = opaque;
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g_queue_foreach(&s->conn_list, colo_old_packet_check_one_conn, NULL);
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}
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/*
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* Called from the compare thread on the primary
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* for compare connection
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*/
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static void colo_compare_connection(void *opaque, void *user_data)
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{
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CompareState *s = user_data;
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Connection *conn = opaque;
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Packet *pkt = NULL;
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GList *result = NULL;
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int ret;
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while (!g_queue_is_empty(&conn->primary_list) &&
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!g_queue_is_empty(&conn->secondary_list)) {
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qemu_mutex_lock(&s->timer_check_lock);
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pkt = g_queue_pop_tail(&conn->primary_list);
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qemu_mutex_unlock(&s->timer_check_lock);
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switch (conn->ip_proto) {
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case IPPROTO_TCP:
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result = g_queue_find_custom(&conn->secondary_list,
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pkt, (GCompareFunc)colo_packet_compare_tcp);
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break;
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case IPPROTO_UDP:
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result = g_queue_find_custom(&conn->secondary_list,
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pkt, (GCompareFunc)colo_packet_compare_udp);
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break;
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case IPPROTO_ICMP:
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result = g_queue_find_custom(&conn->secondary_list,
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pkt, (GCompareFunc)colo_packet_compare_icmp);
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break;
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default:
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result = g_queue_find_custom(&conn->secondary_list,
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pkt, (GCompareFunc)colo_packet_compare_other);
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break;
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}
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if (result) {
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ret = compare_chr_send(&s->chr_out, pkt->data, pkt->size);
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if (ret < 0) {
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error_report("colo_send_primary_packet failed");
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}
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trace_colo_compare_main("packet same and release packet");
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g_queue_remove(&conn->secondary_list, result->data);
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packet_destroy(pkt, NULL);
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} else {
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/*
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* If one packet arrive late, the secondary_list or
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* primary_list will be empty, so we can't compare it
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* until next comparison.
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*/
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trace_colo_compare_main("packet different");
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qemu_mutex_lock(&s->timer_check_lock);
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g_queue_push_tail(&conn->primary_list, pkt);
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qemu_mutex_unlock(&s->timer_check_lock);
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/* TODO: colo_notify_checkpoint();*/
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break;
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}
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}
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}
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static int compare_chr_send(CharBackend *out,
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const uint8_t *buf,
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uint32_t size)
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{
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int ret = 0;
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uint32_t len = htonl(size);
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if (!size) {
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return 0;
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}
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ret = qemu_chr_fe_write_all(out, (uint8_t *)&len, sizeof(len));
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if (ret != sizeof(len)) {
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goto err;
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}
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ret = qemu_chr_fe_write_all(out, (uint8_t *)buf, size);
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if (ret != size) {
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goto err;
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}
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return 0;
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err:
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return ret < 0 ? ret : -EIO;
|
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}
|
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|
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static int compare_chr_can_read(void *opaque)
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{
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return COMPARE_READ_LEN_MAX;
|
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}
|
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|
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/*
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* Called from the main thread on the primary for packets
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* arriving over the socket from the primary.
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*/
|
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static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size)
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{
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CompareState *s = COLO_COMPARE(opaque);
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int ret;
|
|
|
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ret = net_fill_rstate(&s->pri_rs, buf, size);
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if (ret == -1) {
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qemu_chr_fe_set_handlers(&s->chr_pri_in, NULL, NULL, NULL,
|
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NULL, NULL, true);
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error_report("colo-compare primary_in error");
|
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}
|
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}
|
|
|
|
/*
|
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* Called from the main thread on the primary for packets
|
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* arriving over the socket from the secondary.
|
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*/
|
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static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size)
|
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{
|
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CompareState *s = COLO_COMPARE(opaque);
|
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int ret;
|
|
|
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ret = net_fill_rstate(&s->sec_rs, buf, size);
|
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if (ret == -1) {
|
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qemu_chr_fe_set_handlers(&s->chr_sec_in, NULL, NULL, NULL,
|
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NULL, NULL, true);
|
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error_report("colo-compare secondary_in error");
|
|
}
|
|
}
|
|
|
|
static void *colo_compare_thread(void *opaque)
|
|
{
|
|
GMainContext *worker_context;
|
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GMainLoop *compare_loop;
|
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CompareState *s = opaque;
|
|
|
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worker_context = g_main_context_new();
|
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|
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qemu_chr_fe_set_handlers(&s->chr_pri_in, compare_chr_can_read,
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compare_pri_chr_in, NULL, s, worker_context, true);
|
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qemu_chr_fe_set_handlers(&s->chr_sec_in, compare_chr_can_read,
|
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compare_sec_chr_in, NULL, s, worker_context, true);
|
|
|
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compare_loop = g_main_loop_new(worker_context, FALSE);
|
|
|
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g_main_loop_run(compare_loop);
|
|
|
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g_main_loop_unref(compare_loop);
|
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g_main_context_unref(worker_context);
|
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return NULL;
|
|
}
|
|
|
|
static char *compare_get_pri_indev(Object *obj, Error **errp)
|
|
{
|
|
CompareState *s = COLO_COMPARE(obj);
|
|
|
|
return g_strdup(s->pri_indev);
|
|
}
|
|
|
|
static void compare_set_pri_indev(Object *obj, const char *value, Error **errp)
|
|
{
|
|
CompareState *s = COLO_COMPARE(obj);
|
|
|
|
g_free(s->pri_indev);
|
|
s->pri_indev = g_strdup(value);
|
|
}
|
|
|
|
static char *compare_get_sec_indev(Object *obj, Error **errp)
|
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{
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CompareState *s = COLO_COMPARE(obj);
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return g_strdup(s->sec_indev);
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}
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static void compare_set_sec_indev(Object *obj, const char *value, Error **errp)
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{
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CompareState *s = COLO_COMPARE(obj);
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g_free(s->sec_indev);
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s->sec_indev = g_strdup(value);
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}
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static char *compare_get_outdev(Object *obj, Error **errp)
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{
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CompareState *s = COLO_COMPARE(obj);
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return g_strdup(s->outdev);
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}
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static void compare_set_outdev(Object *obj, const char *value, Error **errp)
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{
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CompareState *s = COLO_COMPARE(obj);
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g_free(s->outdev);
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s->outdev = g_strdup(value);
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}
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static void compare_pri_rs_finalize(SocketReadState *pri_rs)
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{
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CompareState *s = container_of(pri_rs, CompareState, pri_rs);
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if (packet_enqueue(s, PRIMARY_IN)) {
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trace_colo_compare_main("primary: unsupported packet in");
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compare_chr_send(&s->chr_out, pri_rs->buf, pri_rs->packet_len);
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} else {
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/* compare connection */
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g_queue_foreach(&s->conn_list, colo_compare_connection, s);
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}
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}
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static void compare_sec_rs_finalize(SocketReadState *sec_rs)
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{
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CompareState *s = container_of(sec_rs, CompareState, sec_rs);
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if (packet_enqueue(s, SECONDARY_IN)) {
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trace_colo_compare_main("secondary: unsupported packet in");
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} else {
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/* compare connection */
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g_queue_foreach(&s->conn_list, colo_compare_connection, s);
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}
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}
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|
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/*
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* Return 0 is success.
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* Return 1 is failed.
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*/
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static int find_and_check_chardev(Chardev **chr,
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char *chr_name,
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Error **errp)
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{
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*chr = qemu_chr_find(chr_name);
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if (*chr == NULL) {
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error_setg(errp, "Device '%s' not found",
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chr_name);
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return 1;
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}
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if (!qemu_chr_has_feature(*chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) {
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error_setg(errp, "chardev \"%s\" is not reconnectable",
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chr_name);
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return 1;
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}
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return 0;
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}
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/*
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* Check old packet regularly so it can watch for any packets
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* that the secondary hasn't produced equivalents of.
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*/
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static void check_old_packet_regular(void *opaque)
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{
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CompareState *s = opaque;
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timer_mod(s->timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
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REGULAR_PACKET_CHECK_MS);
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/* if have old packet we will notify checkpoint */
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/*
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* TODO: Make timer handler run in compare thread
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* like qemu_chr_add_handlers_full.
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*/
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qemu_mutex_lock(&s->timer_check_lock);
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colo_old_packet_check(s);
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qemu_mutex_unlock(&s->timer_check_lock);
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}
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/*
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* Called from the main thread on the primary
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* to setup colo-compare.
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*/
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static void colo_compare_complete(UserCreatable *uc, Error **errp)
|
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{
|
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CompareState *s = COLO_COMPARE(uc);
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Chardev *chr;
|
|
char thread_name[64];
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static int compare_id;
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|
|
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if (!s->pri_indev || !s->sec_indev || !s->outdev) {
|
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error_setg(errp, "colo compare needs 'primary_in' ,"
|
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"'secondary_in','outdev' property set");
|
|
return;
|
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} else if (!strcmp(s->pri_indev, s->outdev) ||
|
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!strcmp(s->sec_indev, s->outdev) ||
|
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!strcmp(s->pri_indev, s->sec_indev)) {
|
|
error_setg(errp, "'indev' and 'outdev' could not be same "
|
|
"for compare module");
|
|
return;
|
|
}
|
|
|
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if (find_and_check_chardev(&chr, s->pri_indev, errp) ||
|
|
!qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) {
|
|
return;
|
|
}
|
|
|
|
if (find_and_check_chardev(&chr, s->sec_indev, errp) ||
|
|
!qemu_chr_fe_init(&s->chr_sec_in, chr, errp)) {
|
|
return;
|
|
}
|
|
|
|
if (find_and_check_chardev(&chr, s->outdev, errp) ||
|
|
!qemu_chr_fe_init(&s->chr_out, chr, errp)) {
|
|
return;
|
|
}
|
|
|
|
net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize);
|
|
net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize);
|
|
|
|
g_queue_init(&s->conn_list);
|
|
qemu_mutex_init(&s->timer_check_lock);
|
|
|
|
s->connection_track_table = g_hash_table_new_full(connection_key_hash,
|
|
connection_key_equal,
|
|
g_free,
|
|
connection_destroy);
|
|
|
|
sprintf(thread_name, "colo-compare %d", compare_id);
|
|
qemu_thread_create(&s->thread, thread_name,
|
|
colo_compare_thread, s,
|
|
QEMU_THREAD_JOINABLE);
|
|
compare_id++;
|
|
|
|
/* A regular timer to kick any packets that the secondary doesn't match */
|
|
s->timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, /* Only when guest runs */
|
|
check_old_packet_regular, s);
|
|
timer_mod(s->timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
|
|
REGULAR_PACKET_CHECK_MS);
|
|
|
|
return;
|
|
}
|
|
|
|
static void colo_compare_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
|
|
|
|
ucc->complete = colo_compare_complete;
|
|
}
|
|
|
|
static void colo_compare_init(Object *obj)
|
|
{
|
|
object_property_add_str(obj, "primary_in",
|
|
compare_get_pri_indev, compare_set_pri_indev,
|
|
NULL);
|
|
object_property_add_str(obj, "secondary_in",
|
|
compare_get_sec_indev, compare_set_sec_indev,
|
|
NULL);
|
|
object_property_add_str(obj, "outdev",
|
|
compare_get_outdev, compare_set_outdev,
|
|
NULL);
|
|
}
|
|
|
|
static void colo_compare_finalize(Object *obj)
|
|
{
|
|
CompareState *s = COLO_COMPARE(obj);
|
|
|
|
qemu_chr_fe_deinit(&s->chr_pri_in);
|
|
qemu_chr_fe_deinit(&s->chr_sec_in);
|
|
qemu_chr_fe_deinit(&s->chr_out);
|
|
|
|
g_queue_free(&s->conn_list);
|
|
|
|
if (qemu_thread_is_self(&s->thread)) {
|
|
/* compare connection */
|
|
g_queue_foreach(&s->conn_list, colo_compare_connection, s);
|
|
qemu_thread_join(&s->thread);
|
|
}
|
|
|
|
if (s->timer) {
|
|
timer_del(s->timer);
|
|
}
|
|
|
|
qemu_mutex_destroy(&s->timer_check_lock);
|
|
|
|
g_free(s->pri_indev);
|
|
g_free(s->sec_indev);
|
|
g_free(s->outdev);
|
|
}
|
|
|
|
static const TypeInfo colo_compare_info = {
|
|
.name = TYPE_COLO_COMPARE,
|
|
.parent = TYPE_OBJECT,
|
|
.instance_size = sizeof(CompareState),
|
|
.instance_init = colo_compare_init,
|
|
.instance_finalize = colo_compare_finalize,
|
|
.class_size = sizeof(CompareClass),
|
|
.class_init = colo_compare_class_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ TYPE_USER_CREATABLE },
|
|
{ }
|
|
}
|
|
};
|
|
|
|
static void register_types(void)
|
|
{
|
|
type_register_static(&colo_compare_info);
|
|
}
|
|
|
|
type_init(register_types);
|