[v13,06/12] migration: Add block where to send/receive packets

diff --git a/migration/ram.c b/migration/ram.c
index 90f62144e2..c9a9bd79f3 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -553,6 +553,8 @@  typedef struct {
     bool running;
     /* should this thread finish */
     bool quit;
+    /* thread has work to do */
+    int pending_job;
     /* array of pages to sent */
     MultiFDPages_t *pages;
     /* packet allocated len */
@@ -588,6 +590,8 @@  typedef struct {
     bool running;
     /* should this thread finish */
     bool quit;
+    /* thread has work to do */
+    bool pending_job;
     /* array of pages to receive */
     MultiFDPages_t *pages;
     /* packet allocated len */
@@ -870,8 +874,28 @@  static void *multifd_send_thread(void *opaque)
     while (true) {
         qemu_sem_wait(&p->sem);
         qemu_mutex_lock(&p->mutex);
-        multifd_send_fill_packet(p);
-        if (p->quit) {
+
+        if (p->pending_job) {
+            uint32_t used = p->pages->used;
+            uint32_t seq = p->seq;
+            uint32_t flags = p->flags;
+
+            multifd_send_fill_packet(p);
+            p->flags = 0;
+            p->num_packets++;
+            p->num_pages += used;
+            p->pages->used = 0;
+            qemu_mutex_unlock(&p->mutex);
+
+            trace_multifd_send(p->id, seq, used, flags);
+
+            /* ToDo: send packet here */
+
+            qemu_mutex_lock(&p->mutex);
+            p->pending_job--;
+            qemu_mutex_unlock(&p->mutex);
+            continue;
+        } else if (p->quit) {
             qemu_mutex_unlock(&p->mutex);
             break;
         }
@@ -937,6 +961,7 @@  int multifd_save_setup(void)
         qemu_mutex_init(&p->mutex);
         qemu_sem_init(&p->sem, 0);
         p->quit = false;
+        p->pending_job = 0;
         p->id = i;
         p->pages = multifd_pages_init(page_count);
         p->packet_len = sizeof(MultiFDPacket_t)
@@ -1024,14 +1049,27 @@  static void *multifd_recv_thread(void *opaque)
     while (true) {
         qemu_sem_wait(&p->sem);
         qemu_mutex_lock(&p->mutex);
-        if (false)  {
-            /* ToDo: Packet reception goes here */
+        if (p->pending_job) {
+            uint32_t used;
+            uint32_t flags;
+            qemu_mutex_unlock(&p->mutex);
 
+            /* ToDo: recv packet here */
+
+            qemu_mutex_lock(&p->mutex);
             ret = multifd_recv_unfill_packet(p, &local_err);
-            qemu_mutex_unlock(&p->mutex);
             if (ret) {
+                qemu_mutex_unlock(&p->mutex);
                 break;
             }
+
+            used = p->pages->used;
+            flags = p->flags;
+            trace_multifd_recv(p->id, p->seq, used, flags);
+            p->pending_job = false;
+            p->num_packets++;
+            p->num_pages += used;
+            qemu_mutex_unlock(&p->mutex);
         } else if (p->quit) {
             qemu_mutex_unlock(&p->mutex);
             break;
@@ -1074,6 +1112,7 @@  int multifd_load_setup(void)
         qemu_mutex_init(&p->mutex);
         qemu_sem_init(&p->sem, 0);
         p->quit = false;
+        p->pending_job = false;
         p->id = i;
         p->pages = multifd_pages_init(page_count);
         p->packet_len = sizeof(MultiFDPacket_t)
diff --git a/migration/trace-events b/migration/trace-events
index 3c7a9a8332..36e20b312d 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -76,8 +76,10 @@  get_queued_page_not_dirty(const char *block_name, uint64_t tmp_offset, unsigned
 migration_bitmap_sync_start(void) ""
 migration_bitmap_sync_end(uint64_t dirty_pages) "dirty_pages %" PRIu64
 migration_throttle(void) ""
+multifd_recv(uint8_t id, uint32_t seq, uint32_t used, uint32_t flags) "channel %d seq number %d pages %d flags 0x%x"
 multifd_recv_thread_end(uint8_t id, uint32_t packets, uint32_t pages) "channel %d packets %d pages %d"
 multifd_recv_thread_start(uint8_t id) "%d"
+multifd_send(uint8_t id, uint32_t seq, uint32_t used, uint32_t flags) "channel %d seq number %d pages %d flags 0x%x"
 multifd_send_thread_end(uint8_t id, uint32_t packets, uint32_t pages) "channel %d packets %d pages %d"
 multifd_send_thread_start(uint8_t id) "%d"
 ram_discard_range(const char *rbname, uint64_t start, size_t len) "%s: start: %" PRIx64 " %zx"