migration: Move migration_total_bytes() to migration-stats.c

Once there rename it to migration_transferred_bytes() and pass a
QEMUFile instead of a migration object.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20230515195709.63843-7-quintela@redhat.com>

migration/migration-stats.c

@@ -59,3 +59,8 @@ void migration_rate_account(uint64_t len)
 {
     stat64_add(&mig_stats.rate_limit_used, len);
 }
+
+uint64_t migration_transferred_bytes(QEMUFile *f)
+{
+    return qemu_file_transferred(f) + stat64_get(&mig_stats.multifd_bytes);
+}

migration/migration-stats.h

@@ -133,4 +133,15 @@ void migration_rate_reset(void);
  * @new_rate: new maximum amount
  */
 void migration_rate_set(uint64_t new_rate);
+
+/**
+ * migration_transferred_bytes: Return number of bytes transferred
+ *
+ * @f: QEMUFile used for main migration channel
+ *
+ * Returns how many bytes have we transferred since the beginning of
+ * the migration.  It accounts for bytes sent through any migration
+ * channel, multifd, qemu_file, rdma, ....
+ */
+uint64_t migration_transferred_bytes(QEMUFile *f);
 #endif

migration/migration.c

@@ -2625,16 +2625,9 @@ static MigThrError migration_detect_error(MigrationState *s)
     }
 }
 
-/* How many bytes have we transferred since the beginning of the migration */
-static uint64_t migration_total_bytes(MigrationState *s)
-{
-    return qemu_file_transferred(s->to_dst_file) +
-        stat64_get(&mig_stats.multifd_bytes);
-}
-
 static void migration_calculate_complete(MigrationState *s)
 {
-    uint64_t bytes = migration_total_bytes(s);
+    uint64_t bytes = migration_transferred_bytes(s->to_dst_file);
     int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
     int64_t transfer_time;
 
@@ -2660,7 +2653,7 @@ static void update_iteration_initial_status(MigrationState *s)
      * wrong speed calculation.
      */
     s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-    s->iteration_initial_bytes = migration_total_bytes(s);
+    s->iteration_initial_bytes = migration_transferred_bytes(s->to_dst_file);
     s->iteration_initial_pages = ram_get_total_transferred_pages();
 }
 
@@ -2675,7 +2668,7 @@ static void migration_update_counters(MigrationState *s,
         return;
     }
 
-    current_bytes = migration_total_bytes(s);
+    current_bytes = migration_transferred_bytes(s->to_dst_file);
     transferred = current_bytes - s->iteration_initial_bytes;
     time_spent = current_time - s->iteration_start_time;
     bandwidth = (double)transferred / time_spent;