linux-kernel - [PATCH net-next 01/14] devlink: Add new "max_mac_per

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Message-Id: <20251015-jk-iwl-next-2025-10-15-v1-1-79c70b9ddab8@intel.com>
Date: Wed, 15 Oct 2025 12:31:57 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Jiri Pirko <jiri@...nulli.us>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 Jonathan Corbet <corbet@....net>, Tony Nguyen <anthony.l.nguyen@...el.com>, 
 Przemek Kitszel <przemyslaw.kitszel@...el.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: netdev@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jacob Keller <jacob.e.keller@...el.com>, 
 Mohammad Heib <mheib@...hat.com>
Subject: [PATCH net-next 01/14] devlink: Add new "max_mac_per_vf" generic
 device param

From: Mohammad Heib <mheib@...hat.com>

Add a new device generic parameter to controls the maximum
number of MAC filters allowed per VF.

For example, to limit a VF to 3 MAC addresses:
 $ devlink dev param set pci/0000:3b:00.0 name max_mac_per_vf \
        value 3 \
        cmode runtime

Signed-off-by: Mohammad Heib <mheib@...hat.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
---
 include/net/devlink.h                               | 4 ++++
 net/devlink/param.c                                 | 5 +++++
 Documentation/networking/devlink/devlink-params.rst | 4 ++++
 3 files changed, 13 insertions(+)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 9e824f61e40f..d01046ef0577 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -532,6 +532,7 @@ enum devlink_param_generic_id {
 	DEVLINK_PARAM_GENERIC_ID_CLOCK_ID,
 	DEVLINK_PARAM_GENERIC_ID_TOTAL_VFS,
 	DEVLINK_PARAM_GENERIC_ID_NUM_DOORBELLS,
+	DEVLINK_PARAM_GENERIC_ID_MAX_MAC_PER_VF,
 
 	/* add new param generic ids above here*/
 	__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -602,6 +603,9 @@ enum devlink_param_generic_id {
 #define DEVLINK_PARAM_GENERIC_NUM_DOORBELLS_NAME "num_doorbells"
 #define DEVLINK_PARAM_GENERIC_NUM_DOORBELLS_TYPE DEVLINK_PARAM_TYPE_U32
 
+#define DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_NAME "max_mac_per_vf"
+#define DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_TYPE DEVLINK_PARAM_TYPE_U32
+
 #define DEVLINK_PARAM_GENERIC(_id, _cmodes, _get, _set, _validate)	\
 {									\
 	.id = DEVLINK_PARAM_GENERIC_ID_##_id,				\
diff --git a/net/devlink/param.c b/net/devlink/param.c
index 70e69523412c..6b233b13b69a 100644
--- a/net/devlink/param.c
+++ b/net/devlink/param.c
@@ -112,6 +112,11 @@ static const struct devlink_param devlink_param_generic[] = {
 		.name = DEVLINK_PARAM_GENERIC_NUM_DOORBELLS_NAME,
 		.type = DEVLINK_PARAM_GENERIC_NUM_DOORBELLS_TYPE,
 	},
+	{
+		.id = DEVLINK_PARAM_GENERIC_ID_MAX_MAC_PER_VF,
+		.name = DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_NAME,
+		.type = DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_TYPE,
+	},
 };
 
 static int devlink_param_generic_verify(const struct devlink_param *param)
diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
index 0a9c20d70122..c0597d456641 100644
--- a/Documentation/networking/devlink/devlink-params.rst
+++ b/Documentation/networking/devlink/devlink-params.rst
@@ -151,3 +151,7 @@ own name.
    * - ``num_doorbells``
      - u32
      - Controls the number of doorbells used by the device.
+   * - ``max_mac_per_vf``
+     - u32
+     - Controls the maximum number of MAC address filters that can be assigned
+       to a Virtual Function (VF).

-- 
2.51.0.rc1.197.g6d975e95c9d7