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Message-Id: <20220720183449.2070222-2-jacob.e.keller@intel.com>
Date:   Wed, 20 Jul 2022 11:34:47 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Jacob Keller <jacob.e.keller@...el.com>
Subject: [iproute2-next PATCH 1/3] update <linux/devlink.h> UAPI header

Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
---
 include/uapi/linux/devlink.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index da0f1ba8f7a0..90f6cf97d308 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -576,6 +576,14 @@ enum devlink_attr {
 	DEVLINK_ATTR_LINECARD_TYPE,		/* string */
 	DEVLINK_ATTR_LINECARD_SUPPORTED_TYPES,	/* nested */
 
+	/* Before adding this attribute to a command, user space should check
+	 * the policy dump and verify the kernel recognizes the attribute.
+	 * Otherwise older kernels which do not recognize the attribute may
+	 * silently accept the unknown attribute while not actually performing
+	 * a dry run.
+	 */
+	DEVLINK_ATTR_DRY_RUN,			/* flag */
+
 	/* add new attributes above here, update the policy in devlink.c */
 
 	__DEVLINK_ATTR_MAX,
-- 
2.36.1

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