@@ -132,6 +132,7 @@ Packet *packet_new(const void *data, int size)
pkt->data = g_memdup(data, size);
pkt->size = size;
+ pkt->creation_ms = qemu_clock_get_ms(QEMU_CLOCK_HOST);
return pkt;
}
@@ -17,6 +17,7 @@
#include "slirp/slirp.h"
#include "qemu/jhash.h"
+#include "qemu/timer.h"
#define HASHTABLE_MAX_SIZE 16384
@@ -28,6 +29,8 @@ typedef struct Packet {
};
uint8_t *transport_layer;
int size;
+ /* Time of packet creation, in wall clock ms */
+ int64_t creation_ms;
} Packet;
typedef struct ConnectionKey {
@@ -36,6 +36,8 @@
#define COMPARE_READ_LEN_MAX NET_BUFSIZE
#define MAX_QUEUE_SIZE 1024
+/* TODO: Should be configurable */
+#define REGULAR_PACKET_CHECK_MS 3000
/*
+ CompareState ++
@@ -83,6 +85,10 @@ typedef struct CompareState {
GQueue unprocessed_connections;
/* proxy current hash size */
uint32_t hashtable_size;
+ /* compare thread, a thread for each NIC */
+ QemuThread thread;
+ /* Timer used on the primary to find packets that are never matched */
+ QEMUTimer *timer;
} CompareState;
typedef struct CompareClass {
@@ -170,6 +176,112 @@ static int packet_enqueue(CompareState *s, int mode)
return 0;
}
+/*
+ * The IP packets sent by primary and secondary
+ * will be compared in here
+ * TODO support ip fragment, Out-Of-Order
+ * return: 0 means packet same
+ * > 0 || < 0 means packet different
+ */
+static int colo_packet_compare(Packet *ppkt, Packet *spkt)
+{
+ trace_colo_compare_ip_info(ppkt->size, inet_ntoa(ppkt->ip->ip_src),
+ inet_ntoa(ppkt->ip->ip_dst), spkt->size,
+ inet_ntoa(spkt->ip->ip_src),
+ inet_ntoa(spkt->ip->ip_dst));
+
+ if (ppkt->size == spkt->size) {
+ return memcmp(ppkt->data, spkt->data, spkt->size);
+ } else {
+ return -1;
+ }
+}
+
+static int colo_packet_compare_all(Packet *spkt, Packet *ppkt)
+{
+ trace_colo_compare_main("compare all");
+ return colo_packet_compare(ppkt, spkt);
+}
+
+static void colo_old_packet_check_one(void *opaque_packet,
+ void *opaque_found)
+{
+ int64_t now;
+ bool *found_old = (bool *)opaque_found;
+ Packet *ppkt = (Packet *)opaque_packet;
+
+ if (*found_old) {
+ /* Someone found an old packet earlier in the queue */
+ return;
+ }
+
+ now = qemu_clock_get_ms(QEMU_CLOCK_HOST);
+ if ((now - ppkt->creation_ms) > REGULAR_PACKET_CHECK_MS) {
+ trace_colo_old_packet_check_found(ppkt->creation_ms);
+ *found_old = true;
+ }
+}
+
+static void colo_old_packet_check_one_conn(void *opaque,
+ void *user_data)
+{
+ bool found_old = false;
+ Connection *conn = opaque;
+
+ g_queue_foreach(&conn->primary_list, colo_old_packet_check_one,
+ &found_old);
+ if (found_old) {
+ /* do checkpoint will flush old packet */
+ /* TODO: colo_notify_checkpoint();*/
+ }
+}
+
+/*
+ * Look for old packets that the secondary hasn't matched,
+ * if we have some then we have to checkpoint to wake
+ * the secondary up.
+ */
+static void colo_old_packet_check(void *opaque)
+{
+ CompareState *s = opaque;
+
+ g_queue_foreach(&s->conn_list, colo_old_packet_check_one_conn, NULL);
+}
+
+/*
+ * called from the compare thread on the primary
+ * for compare connection
+ */
+static void colo_compare_connection(void *opaque, void *user_data)
+{
+ CompareState *s = user_data;
+ Connection *conn = opaque;
+ Packet *pkt = NULL;
+ GList *result = NULL;
+ int ret;
+
+ while (!g_queue_is_empty(&conn->primary_list) &&
+ !g_queue_is_empty(&conn->secondary_list)) {
+ pkt = g_queue_pop_tail(&conn->primary_list);
+ result = g_queue_find_custom(&conn->secondary_list,
+ pkt, (GCompareFunc)colo_packet_compare_all);
+
+ if (result) {
+ ret = compare_chr_send(s->chr_out, pkt->data, pkt->size);
+ if (ret < 0) {
+ error_report("colo_send_primary_packet failed");
+ }
+ trace_colo_compare_main("packet same and release packet");
+ g_queue_remove(&conn->secondary_list, result->data);
+ } else {
+ trace_colo_compare_main("packet different");
+ g_queue_push_tail(&conn->primary_list, pkt);
+ /* TODO: colo_notify_checkpoint();*/
+ break;
+ }
+ }
+}
+
static int compare_chr_send(CharDriverState *out,
const uint8_t *buf,
uint32_t size)
@@ -197,6 +309,65 @@ err:
return ret < 0 ? ret : -EIO;
}
+static int compare_chr_can_read(void *opaque)
+{
+ return COMPARE_READ_LEN_MAX;
+}
+
+/*
+ * called from the main thread on the primary for packets
+ * arriving over the socket from the primary.
+ */
+static void compare_pri_chr_in(void *opaque, const uint8_t *buf, int size)
+{
+ CompareState *s = COLO_COMPARE(opaque);
+ int ret;
+
+ ret = net_fill_rstate(&s->pri_rs, buf, size);
+ if (ret == -1) {
+ qemu_chr_add_handlers(s->chr_pri_in, NULL, NULL, NULL, NULL);
+ error_report("colo-compare primary_in error");
+ }
+}
+
+/*
+ * called from the main thread on the primary for packets
+ * arriving over the socket from the secondary.
+ */
+static void compare_sec_chr_in(void *opaque, const uint8_t *buf, int size)
+{
+ CompareState *s = COLO_COMPARE(opaque);
+ int ret;
+
+ ret = net_fill_rstate(&s->sec_rs, buf, size);
+ if (ret == -1) {
+ qemu_chr_add_handlers(s->chr_sec_in, NULL, NULL, NULL, NULL);
+ error_report("colo-compare secondary_in error");
+ }
+}
+
+static void *colo_compare_thread(void *opaque)
+{
+ GMainContext *worker_context;
+ GMainLoop *compare_loop;
+ CompareState *s = opaque;
+
+ worker_context = g_main_context_new();
+
+ qemu_chr_add_handlers_full(s->chr_pri_in, compare_chr_can_read,
+ compare_pri_chr_in, NULL, s, worker_context);
+ qemu_chr_add_handlers_full(s->chr_sec_in, compare_chr_can_read,
+ compare_sec_chr_in, NULL, s, worker_context);
+
+ compare_loop = g_main_loop_new(worker_context, FALSE);
+
+ g_main_loop_run(compare_loop);
+
+ g_main_loop_unref(compare_loop);
+ g_main_context_unref(worker_context);
+ return NULL;
+}
+
static char *compare_get_pri_indev(Object *obj, Error **errp)
{
CompareState *s = COLO_COMPARE(obj);
@@ -249,6 +420,9 @@ static void compare_pri_rs_finalize(SocketReadState *pri_rs)
if (packet_enqueue(s, PRIMARY_IN)) {
trace_colo_compare_main("primary: unsupported packet in");
compare_chr_send(s->chr_out, pri_rs->buf, pri_rs->packet_len);
+ } else {
+ /* compare connection */
+ g_queue_foreach(&s->conn_list, colo_compare_connection, s);
}
}
@@ -258,16 +432,35 @@ static void compare_sec_rs_finalize(SocketReadState *sec_rs)
if (packet_enqueue(s, SECONDARY_IN)) {
trace_colo_compare_main("secondary: unsupported packet in");
+ } else {
+ /* compare connection */
+ g_queue_foreach(&s->conn_list, colo_compare_connection, s);
}
}
/*
+ * Check old packet regularly so it can watch for any packets
+ * that the secondary hasn't produced equivalents of.
+ */
+static void check_old_packet_regular(void *opaque)
+{
+ CompareState *s = opaque;
+
+ timer_mod(s->timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
+ REGULAR_PACKET_CHECK_MS);
+ /* if have old packet we will notify checkpoint */
+ colo_old_packet_check(s);
+}
+
+/*
* called from the main thread on the primary
* to setup colo-compare.
*/
static void colo_compare_complete(UserCreatable *uc, Error **errp)
{
CompareState *s = COLO_COMPARE(uc);
+ char thread_name[64];
+ static int compare_id;
if (!s->pri_indev || !s->sec_indev || !s->outdev) {
error_setg(errp, "colo compare needs 'primary_in' ,"
@@ -319,6 +512,18 @@ static void colo_compare_complete(UserCreatable *uc, Error **errp)
g_free,
connection_destroy);
+ sprintf(thread_name, "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;
}
@@ -360,6 +565,13 @@ static void colo_compare_finalize(Object *obj)
g_queue_free(&s->conn_list);
+ if (s->thread.thread) {
+ /* compare connection */
+ g_queue_foreach(&s->conn_list, colo_compare_connection, s);
+ qemu_thread_join(&s->thread);
+ }
+ timer_del(s->timer);
+
g_free(s->pri_indev);
g_free(s->sec_indev);
g_free(s->outdev);
@@ -1919,3 +1919,5 @@ aspeed_vic_write(uint64_t offset, unsigned size, uint32_t data) "To 0x%" PRIx64
# net/colo-compare.c
colo_compare_main(const char *chr) ": %s"
+colo_compare_ip_info(int psize, const char *sta, const char *stb, int ssize, const char *stc, const char *std) "ppkt size = %d, ip_src = %s, ip_dst = %s, spkt size = %d, ip_src = %s, ip_dst = %s"
+colo_old_packet_check_found(int64_t old_time) "%" PRId64