[PATCH 5/7] migration: Dump type of channel in set_incoming_channel tracepoint

[Peter Xu <peterx@redhat.com>]

Add this info to be crystal clear on what channel we're installing.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/channel.h    |  3 ++-
 migration/channel.c    | 10 +++++++++-
 migration/trace-events |  2 +-
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/migration/channel.h b/migration/channel.h
index a7d0d29058..678712f291 100644
--- a/migration/channel.h
+++ b/migration/channel.h
@@ -24,7 +24,8 @@ typedef enum {
     CH_NONE,
     CH_MAIN,
     CH_MULTIFD,
-    CH_POSTCOPY
+    CH_POSTCOPY,
+    CH_NUM,
 } MigChannelType;
 
 void migration_channel_process_incoming(QIOChannel *ioc);
diff --git a/migration/channel.c b/migration/channel.c
index 8407ea46cb..b9065efd03 100644
--- a/migration/channel.c
+++ b/migration/channel.c
@@ -34,6 +34,13 @@
 #include "trace.h"
 #include "yank_functions.h"
 
+static const char *const mig_channel_str[CH_NUM] = {
+    [CH_NONE] = "NONE",
+    [CH_MAIN] = "MAIN",
+    [CH_MULTIFD] = "MULTIFD",
+    [CH_POSTCOPY] = "PREEMPT",
+};
+
 void migration_connect_outgoing(MigrationState *s, MigrationAddress *addr,
                                 Error **errp)
 {
@@ -219,7 +226,8 @@ static bool migration_incoming_channel_install(MigrationIncomingState *mis,
     }
 
     trace_migration_set_incoming_channel(ioc,
-                                         object_get_typename(OBJECT(ioc)));
+                                         object_get_typename(OBJECT(ioc)),
+                                         mig_channel_str[ch]);
     migration_ioc_register_yank(ioc);
 
     if (migration_incoming_setup(ioc, ch, errp)) {
diff --git a/migration/trace-events b/migration/trace-events
index c5fa88fe8f..9ef42f54d1 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -208,7 +208,7 @@ migration_transferred_bytes(uint64_t qemu_file, uint64_t multifd, uint64_t rdma)
 
 # channel.c
 migration_channel_process_incoming(void *ioc, const char *ioctype) "ioc=%p ioctype=%s"
-migration_set_incoming_channel(void *ioc, const char *ioctype) "ioc=%p ioctype=%s"
+migration_set_incoming_channel(void *ioc, const char *ioctype, const char *type) "ioc=%p ioctype=%s type=%s"
 migration_set_outgoing_channel(void *ioc, const char *ioctype) "ioc=%p ioctype=%s"
 
 # global_state.c
-- 
2.55.0