[PATCH net-next v1 2/6] doc/netlink: Add sub-message support to netlink-raw

[Donald Hunter <donald.hunter@gmail.com>]

Add a 'sub-message' attribute type with a selector that supports
polymorphic attribute formats for raw netlink families like tc.

A sub-message attribute uses the value of another attribute as a
selector key to choose the right sub-message format. For example if the
following attribute has already been decoded:

  { "kind": "gre" }

and we encounter the following attribute spec:

  -
    name: data
    type: sub-message
    sub-message: linkinfo-data-msg
    selector: kind

Then we look for a sub-message definition called 'linkinfo-data-msg' and
use the value of the 'kind' attribute i.e. 'gre' as the key to choose
the correct format for the sub-message:

  sub-messages:
    name: linkinfo-data-msg
    formats:
      -
        value: bridge
        attribute-set: linkinfo-bridge-attrs
      -
        value: gre
        attribute-set: linkinfo-gre-attrs
      -
        value: geneve
        attribute-set: linkinfo-geneve-attrs

This would decode the attribute value as a sub-message with the
attribute-set called 'linkinfo-gre-attrs' as the attribute space.

A sub-message can have an optional 'fixed-header' followed by zero or
more attributes from an attribute-set. For example the following
'tc-options-msg' sub-message defines message formats that use a mixture
of fixed-header, attribute-set or both together:

  sub-messages:
    -
      name: tc-options-msg
      formats:
        -
          value: bfifo
          fixed-header: tc-fifo-qopt
        -
          value: cake
          attribute-set: tc-cake-attrs
        -
          value: netem
          fixed-header: tc-netem-qopt
          attribute-set: tc-netem-attrs

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
---
 Documentation/netlink/netlink-raw.yaml | 51 +++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/Documentation/netlink/netlink-raw.yaml b/Documentation/netlink/netlink-raw.yaml
index ad5395040765..26203282422f 100644
--- a/Documentation/netlink/netlink-raw.yaml
+++ b/Documentation/netlink/netlink-raw.yaml
@@ -202,7 +202,8 @@ properties:
                 description: The netlink attribute type
                 enum: [ unused, pad, flag, binary, bitfield32,
                         u8, u16, u32, u64, s8, s16, s32, s64,
-                        string, nest, array-nest, nest-type-value ]
+                        string, nest, array-nest, nest-type-value,
+                        sub-message ]
               doc:
                 description: Documentation of the attribute.
                 type: string
@@ -261,6 +262,17 @@ properties:
                 description: Name of the struct type used for the attribute.
                 type: string
               # End genetlink-legacy
+              # Start netlink-raw
+              sub-message:
+                description:
+                  Name of the sub-message definition to use for the attribute.
+                type: string
+              selector:
+                description:
+                  Name of the attribute to use for dynamic selection of sub-message
+                  format specifier.
+                type: string
+              # End netlink-raw
 
       # Make sure name-prefix does not appear in subsets (subsets inherit naming)
       dependencies:
@@ -283,6 +295,43 @@ properties:
             items:
               required: [ type ]
 
+  # Start netlink-raw
+  sub-messages:
+    description: Definition of sub message attributes
+    type: array
+    items:
+      type: object
+      additionalProperties: False
+      required: [ name, formats ]
+      properties:
+        name:
+          description: Name of the sub-message definition
+          type: string
+        formats:
+          description: Dynamically selected format specifiers
+          type: array
+          items:
+            type: object
+            additionalProperties: False
+            required: [ value ]
+            properties:
+              value:
+                description:
+                  Value to match for dynamic selection of sub-message format
+                  specifier.
+                type: string
+              fixed-header:
+                description:
+                  Name of the struct definition to use as the fixed header
+                  for the sub message.
+                type: string
+              attribute-set:
+                description:
+                  Name of the attribute space from which to resolve attributes
+                  in the sub message.
+                type: string
+  # End netlink-raw
+
   operations:
     description: Operations supported by the protocol.
     type: object
-- 
2.42.0