netdev - [PATCH net-next v2 2/2] rtnetlink: specs: Add {head,tail}room to rt-link.yaml

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Message-ID: <20250917095543.14039-2-alasdair@mcwilliam.dev>
Date: Wed, 17 Sep 2025 10:55:43 +0100
From: Alasdair McWilliam <alasdair@...illiam.dev>
To: Donald Hunter <donald.hunter@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org,
	Alasdair McWilliam <alasdair@...illiam.dev>,
	Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH net-next v2 2/2] rtnetlink: specs: Add {head,tail}room to rt-link.yaml

Add {head,tail}room attributes to rt-link.yaml spec file.

Example:

$ tools/net/ynl/pyynl/cli.py \
  --spec Documentation/netlink/specs/rt-link.yaml \
  --do getlink --json '{"ifname":"enp0s1"}' --output-json \
  | jq -r '{ifname,mtu,headroom,tailroom}'
{
  "ifname": "enp0s1",
  "mtu": 1500,
  "headroom": 12,
  "tailroom": 0
}

Signed-off-by: Alasdair McWilliam <alasdair@...illiam.dev>
Reviewed-by: Daniel Borkmann <daniel@...earbox.net>
---
 Documentation/netlink/specs/rt-link.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/netlink/specs/rt-link.yaml b/Documentation/netlink/specs/rt-link.yaml
index 6ab31f86854d..2a23e9699c0b 100644
--- a/Documentation/netlink/specs/rt-link.yaml
+++ b/Documentation/netlink/specs/rt-link.yaml
@@ -1057,6 +1057,12 @@ attribute-sets:
       -
         name: netns-immutable
         type: u8
+      -
+        name: headroom
+        type: u16
+      -
+        name: tailroom
+        type: u16
   -
     name: prop-list-link-attrs
     subset-of: link-attrs
-- 
2.47.3