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Message-ID: <20231130214959.27377-3-donald.hunter@gmail.com>
Date: Thu, 30 Nov 2023 21:49:54 +0000
From: Donald Hunter <donald.hunter@...il.com>
To: netdev@...r.kernel.org,
Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
Jonathan Corbet <corbet@....net>,
linux-doc@...r.kernel.org,
Jacob Keller <jacob.e.keller@...el.com>
Cc: donald.hunter@...hat.com,
Donald Hunter <donald.hunter@...il.com>
Subject: [PATCH net-next v1 2/6] doc/netlink: Add sub-message support to netlink-raw
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@...il.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
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