migration/rdma: Unfold ram_control_after_iterate()

Once there:
- Remove unused data parameter
- unfold it in its callers
- change all callers to call qemu_rdma_registration_stop()
- We need to call QIO_CHANNEL_RDMA() after we check for migrate_rdma()

Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231011203527.9061-4-quintela@redhat.com>

migration/qemu-file.c

@@ -298,18 +298,6 @@ void qemu_fflush(QEMUFile *f)
     f->iovcnt = 0;
 }
 
-void ram_control_after_iterate(QEMUFile *f, uint64_t flags)
-{
-    int ret = 0;
-
-    if (f->hooks && f->hooks->after_ram_iterate) {
-        ret = f->hooks->after_ram_iterate(f, flags, NULL);
-        if (ret < 0) {
-            qemu_file_set_error(f, ret);
-        }
-    }
-}
-
 void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data)
 {
     if (f->hooks && f->hooks->hook_ram_load) {

migration/qemu-file.h

@@ -55,7 +55,6 @@ typedef int (QEMURamSaveFunc)(QEMUFile *f,
                               size_t size);
 
 typedef struct QEMUFileHooks {
-    QEMURamHookFunc *after_ram_iterate;
     QEMURamHookFunc *hook_ram_load;
     QEMURamSaveFunc *save_page;
 } QEMUFileHooks;
@@ -126,7 +125,6 @@ void qemu_fflush(QEMUFile *f);
 void qemu_file_set_blocking(QEMUFile *f, bool block);
 int qemu_file_get_to_fd(QEMUFile *f, int fd, size_t size);
 
-void ram_control_after_iterate(QEMUFile *f, uint64_t flags);
 void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data);
 
 /* Whenever this is found in the data stream, the flags

migration/ram.c

@@ -3065,7 +3065,11 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
     if (ret < 0) {
         qemu_file_set_error(f, ret);
     }
-    ram_control_after_iterate(f, RAM_CONTROL_SETUP);
+
+    ret = qemu_rdma_registration_stop(f, RAM_CONTROL_SETUP);
+    if (ret < 0) {
+        qemu_file_set_error(f, ret);
+    }
 
     migration_ops = g_malloc0(sizeof(MigrationOps));
     migration_ops->ram_save_target_page = ram_save_target_page_legacy;
@@ -3187,7 +3191,10 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
      * Must occur before EOS (or any QEMUFile operation)
      * because of RDMA protocol.
      */
-    ram_control_after_iterate(f, RAM_CONTROL_ROUND);
+    ret = qemu_rdma_registration_stop(f, RAM_CONTROL_ROUND);
+    if (ret < 0) {
+        qemu_file_set_error(f, ret);
+    }
 
 out:
     if (ret >= 0
@@ -3260,7 +3267,11 @@ static int ram_save_complete(QEMUFile *f, void *opaque)
         qemu_mutex_unlock(&rs->bitmap_mutex);
 
         ram_flush_compressed_data(rs);
-        ram_control_after_iterate(f, RAM_CONTROL_FINISH);
+
+        int ret = qemu_rdma_registration_stop(f, RAM_CONTROL_FINISH);
+        if (ret < 0) {
+            qemu_file_set_error(f, ret);
+        }
     }
 
     if (ret < 0) {

migration/rdma.c

@@ -3878,20 +3878,20 @@ int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags)
  * Inform dest that dynamic registrations are done for now.
  * First, flush writes, if any.
  */
-static int qemu_rdma_registration_stop(QEMUFile *f,
-                                       uint64_t flags, void *data)
+int qemu_rdma_registration_stop(QEMUFile *f, uint64_t flags)
 {
-    QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f));
+    QIOChannelRDMA *rioc;
     Error *err = NULL;
     RDMAContext *rdma;
     RDMAControlHeader head = { .len = 0, .repeat = 1 };
     int ret;
 
-    if (migration_in_postcopy()) {
+    if (!migrate_rdma() || migration_in_postcopy()) {
         return 0;
     }
 
     RCU_READ_LOCK_GUARD();
+    rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f));
     rdma = qatomic_rcu_read(&rioc->rdmaout);
     if (!rdma) {
         return -1;
@@ -3999,7 +3999,6 @@ static const QEMUFileHooks rdma_read_hooks = {
 };
 
 static const QEMUFileHooks rdma_write_hooks = {
-    .after_ram_iterate  = qemu_rdma_registration_stop,
     .save_page          = qemu_rdma_save_page,
 };
 

migration/rdma.h

@@ -25,8 +25,11 @@ void rdma_start_incoming_migration(const char *host_port, Error **errp);
 
 #ifdef CONFIG_RDMA
 int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags);
+int qemu_rdma_registration_stop(QEMUFile *f, uint64_t flags);
 #else
 static inline
 int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags) { return 0; }
+static inline
+int qemu_rdma_registration_stop(QEMUFile *f, uint64_t flags) { return 0; }
 #endif
 #endif