[PATCH v3 02/18] migration/rdma: judge whether or not the RDMA is used for migration

[Chuan Zheng]

Add enabled_rdma_migration into MigrationState to judge
whether or not the RDMA is used for migration.

Signed-off-by: Zhimin Feng <fengzhimin1@huawei.com>
Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
---
 migration/migration.c | 13 +++++++++++++
 migration/migration.h |  6 ++++++
 2 files changed, 19 insertions(+)

diff --git a/migration/migration.c b/migration/migration.c
index 64ae417..be6166a 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -389,7 +389,9 @@ void migrate_add_address(SocketAddress *address)
 void qemu_start_incoming_migration(const char *uri, Error **errp)
 {
     const char *p = NULL;
+    MigrationState *s = migrate_get_current();
 
+    s->enabled_rdma_migration = false;
     qapi_event_send_migration(MIGRATION_STATUS_SETUP);
     if (!strcmp(uri, "defer")) {
         deferred_incoming_migration(errp);
@@ -399,6 +401,7 @@ void qemu_start_incoming_migration(const char *uri, Error 
**errp)
         socket_start_incoming_migration(p ? p : uri, errp);
 #ifdef CONFIG_RDMA
     } else if (strstart(uri, "rdma:", &p)) {
+        s->enabled_rdma_migration = true;
         rdma_start_incoming_migration(p, errp);
 #endif
     } else if (strstart(uri, "exec:", &p)) {
@@ -1887,6 +1890,7 @@ void migrate_init(MigrationState *s)
     s->start_postcopy = false;
     s->postcopy_after_devices = false;
     s->migration_thread_running = false;
+    s->enabled_rdma_migration = false;
     error_free(s->error);
     s->error = NULL;
     s->hostname = NULL;
@@ -2115,6 +2119,7 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
         socket_start_outgoing_migration(s, p ? p : uri, &local_err);
 #ifdef CONFIG_RDMA
     } else if (strstart(uri, "rdma:", &p)) {
+        s->enabled_rdma_migration = true;
         rdma_start_outgoing_migration(s, p, &local_err);
 #endif
     } else if (strstart(uri, "exec:", &p)) {
@@ -2329,6 +2334,14 @@ bool migrate_use_events(void)
     return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
 }
 
+bool migrate_use_rdma(void)
+{
+    MigrationState *s;
+    s = migrate_get_current();
+
+    return s->enabled_rdma_migration;
+}
+
 bool migrate_use_rdma_pin_all(void)
 {
     MigrationState *s;
diff --git a/migration/migration.h b/migration/migration.h
index 74fd790..e92eb29 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -264,6 +264,11 @@ struct MigrationState
      * This save hostname when out-going migration starts
      */
     char *hostname;
+
+    /*
+     * Enable RDMA migration
+     */
+    bool enabled_rdma_migration;
 };
 
 void migrate_set_state(int *state, int old_state, int new_state);
@@ -300,6 +305,7 @@ bool migrate_ignore_shared(void);
 bool migrate_validate_uuid(void);
 
 bool migrate_auto_converge(void);
+bool migrate_use_rdma(void);
 bool migrate_use_rdma_pin_all(void);
 bool migrate_use_multifd(void);
 bool migrate_pause_before_switchover(void);
-- 
1.8.3.1