netdev - [PATCH net-next v2] doc/netlink: Update schema to support cmd-cnt-name and cmd-max-name

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Date: Fri, 27 Oct 2023 16:04:54 +0200
From: Davide Caratti <dcaratti@...hat.com>
To: netdev@...r.kernel.org,
	kuba@...nel.org
Cc: pabeni@...hat.com,
	matttbe@...nel.org
Subject: [PATCH net-next v2] doc/netlink: Update schema to support cmd-cnt-name and cmd-max-name

allow specifying cmd-cnt-name and cmd-max-name in netlink specs, in
accordance with Documentation/userspace-api/netlink/c-code-gen.rst.

Use cmd-cnt-name and attr-cnt-name in the mptcp yaml spec and in the
corresponding uAPI headers, to preserve the #defines we had in the past
and avoid adding new ones.

v2:
 - squash modification in mptcp.yaml and MPTCP uAPI headers

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
 Documentation/netlink/genetlink-c.yaml      | 6 ++++++
 Documentation/netlink/genetlink-legacy.yaml | 6 ++++++
 Documentation/netlink/netlink-raw.yaml      | 6 ++++++
 Documentation/netlink/specs/mptcp.yaml      | 2 ++
 include/uapi/linux/mptcp.h                  | 4 ----
 include/uapi/linux/mptcp_pm.h               | 8 ++++----
 6 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/Documentation/netlink/genetlink-c.yaml b/Documentation/netlink/genetlink-c.yaml
index 9d13bbb7ae47..c58f7153fcf8 100644
--- a/Documentation/netlink/genetlink-c.yaml
+++ b/Documentation/netlink/genetlink-c.yaml
@@ -47,6 +47,12 @@ properties:
   max-by-define:
     description: Makes the number of attributes and commands be specified by a define, not an enum value.
     type: boolean
+  cmd-max-name:
+    description: Name of the define for the last operation in the list.
+    type: string
+  cmd-cnt-name:
+    description: The explicit name for constant holding the count of operations (last operation + 1).
+    type: string
   # End genetlink-c
 
   definitions:
diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml
index 0daf40402a29..938703088306 100644
--- a/Documentation/netlink/genetlink-legacy.yaml
+++ b/Documentation/netlink/genetlink-legacy.yaml
@@ -47,6 +47,12 @@ properties:
   max-by-define:
     description: Makes the number of attributes and commands be specified by a define, not an enum value.
     type: boolean
+  cmd-max-name:
+    description: Name of the define for the last operation in the list.
+    type: string
+  cmd-cnt-name:
+    description: The explicit name for constant holding the count of operations (last operation + 1).
+    type: string
   # End genetlink-c
   # Start genetlink-legacy
   kernel-policy:
diff --git a/Documentation/netlink/netlink-raw.yaml b/Documentation/netlink/netlink-raw.yaml
index 48db31f1d059..775cce8c548a 100644
--- a/Documentation/netlink/netlink-raw.yaml
+++ b/Documentation/netlink/netlink-raw.yaml
@@ -47,6 +47,12 @@ properties:
   max-by-define:
     description: Makes the number of attributes and commands be specified by a define, not an enum value.
     type: boolean
+  cmd-max-name:
+    description: Name of the define for the last operation in the list.
+    type: string
+  cmd-cnt-name:
+    description: The explicit name for constant holding the count of operations (last operation + 1).
+    type: string
   # End genetlink-c
   # Start genetlink-legacy
   kernel-policy:
diff --git a/Documentation/netlink/specs/mptcp.yaml b/Documentation/netlink/specs/mptcp.yaml
index ec5c454a87ea..49f90cfb4698 100644
--- a/Documentation/netlink/specs/mptcp.yaml
+++ b/Documentation/netlink/specs/mptcp.yaml
@@ -8,6 +8,7 @@ c-family-name: mptcp-pm-name
 c-version-name: mptcp-pm-ver
 max-by-define: true
 kernel-policy: per-op
+cmd-cnt-name: --mptcp-pm-cmd-after-last
 
 definitions:
   -
@@ -167,6 +168,7 @@ attribute-sets:
   -
     name: attr
     name-prefix: mptcp-pm-attr-
+    attr-cnt-name: --mptcp-attr-after-last
     attributes:
       -
         name: unspec
diff --git a/include/uapi/linux/mptcp.h b/include/uapi/linux/mptcp.h
index 64ecc8a3f9f2..a6451561f3f8 100644
--- a/include/uapi/linux/mptcp.h
+++ b/include/uapi/linux/mptcp.h
@@ -28,10 +28,6 @@
 
 #include <linux/mptcp_pm.h>
 
-/* for backward compatibility */
-#define	__MPTCP_PM_CMD_AFTER_LAST	__MPTCP_PM_CMD_MAX
-#define	__MPTCP_ATTR_AFTER_LAST		__MPTCP_ATTR_MAX
-
 #define MPTCP_INFO_FLAG_FALLBACK		_BITUL(0)
 #define MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED	_BITUL(1)
 
diff --git a/include/uapi/linux/mptcp_pm.h b/include/uapi/linux/mptcp_pm.h
index 0ad598fe940b..b5d11aece408 100644
--- a/include/uapi/linux/mptcp_pm.h
+++ b/include/uapi/linux/mptcp_pm.h
@@ -100,9 +100,9 @@ enum {
 	MPTCP_PM_ATTR_LOC_ID,
 	MPTCP_PM_ATTR_ADDR_REMOTE,
 
-	__MPTCP_PM_ATTR_MAX
+	__MPTCP_ATTR_AFTER_LAST
 };
-#define MPTCP_PM_ATTR_MAX (__MPTCP_PM_ATTR_MAX - 1)
+#define MPTCP_PM_ATTR_MAX (__MPTCP_ATTR_AFTER_LAST - 1)
 
 enum mptcp_event_attr {
 	MPTCP_ATTR_UNSPEC,
@@ -143,8 +143,8 @@ enum {
 	MPTCP_PM_CMD_SUBFLOW_CREATE,
 	MPTCP_PM_CMD_SUBFLOW_DESTROY,
 
-	__MPTCP_PM_CMD_MAX
+	__MPTCP_PM_CMD_AFTER_LAST
 };
-#define MPTCP_PM_CMD_MAX (__MPTCP_PM_CMD_MAX - 1)
+#define MPTCP_PM_CMD_MAX (__MPTCP_PM_CMD_AFTER_LAST - 1)
 
 #endif /* _UAPI_LINUX_MPTCP_PM_H */
-- 
2.41.0