[PATCH 16/27] docs/qapi-domain: add qapi:struct directive

[John Snow <jsnow@redhat.com>]

Adds the .. qapi:struct:: directive, object, and :qapi:struct:`name`
cross-referencing role.

As per usual, QAPI cross-referencing for types in the member field list
will be added in a forthcoming commit.

RFC Note: The "?" syntax sneaks into the example document again. Please
ignore that for now.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 docs/qapi/index.rst        | 16 ++++++++++++++++
 docs/sphinx/qapi-domain.py |  9 +++++++++
 2 files changed, 25 insertions(+)

diff --git a/docs/qapi/index.rst b/docs/qapi/index.rst
index d81bccfb06a..b07e6e9e2e3 100644
--- a/docs/qapi/index.rst
+++ b/docs/qapi/index.rst
@@ -174,3 +174,19 @@ Explicit cross-referencing syntax for QAPI modules is available with
          "microseconds": 959568
        }
      }
+
+.. qapi:struct:: BackupPerf
+   :since: 6.0
+
+   Optional parameters for backup.  These parameters don't affect
+   functionality, but may significantly affect performance.
+
+   :memb bool? use-copy-range: Use copy offloading.  Default false.
+   :memb int? max-workers: Maximum number of parallel requests for the
+      sustained background copying process.  Doesn't influence
+      copy-before-write operations.  Default 64.
+   :memb int64? max-chunk: Maximum request length for the sustained
+     background copying process.  Doesn't influence copy-before-write
+     operations.  0 means unlimited.  If max-chunk is non-zero then it
+     should not be less than job cluster size which is calculated as
+     maximum of target image cluster size and 64k.  Default 0.
diff --git a/docs/sphinx/qapi-domain.py b/docs/sphinx/qapi-domain.py
index 74dc578b3c7..b46faeaceef 100644
--- a/docs/sphinx/qapi-domain.py
+++ b/docs/sphinx/qapi-domain.py
@@ -343,6 +343,12 @@ class QAPIEvent(QAPIObjectWithMembers):
     pass
 
 
+class QAPIStruct(QAPIObjectWithMembers):
+    """Description of a QAPI Struct."""
+
+    pass
+
+
 class QAPIModule(SphinxDirective):
     """
     Directive to mark description of a new module.
@@ -497,6 +503,7 @@ class QAPIDomain(Domain):
         "command": ObjType(_("command"), "cmd", "obj"),
         "event": ObjType(_("event"), "event", "obj"),
         "enum": ObjType(_("enum"), "enum", "obj", "type"),
+        "struct": ObjType(_("struct"), "struct", "obj", "type"),
         "alternate": ObjType(_("alternate"), "alt", "obj", "type"),
     }
 
@@ -507,6 +514,7 @@ class QAPIDomain(Domain):
         "command": QAPICommand,
         "event": QAPIEvent,
         "enum": QAPIEnum,
+        "struct": QAPIStruct,
         "alternate": QAPIAlternate,
     }
 
@@ -518,6 +526,7 @@ class QAPIDomain(Domain):
         "cmd": QAPIXRefRole(),
         "event": QAPIXRefRole(),
         "enum": QAPIXRefRole(),
+        "struct": QAPIXRefRole(),
         "alt": QAPIXRefRole(),
         "type": QAPIXRefRole(),  # reference any data type (excludes modules, commands, events)
         "obj": QAPIXRefRole(),  # reference *any* type of QAPI object.
-- 
2.44.0