linux-kernel - [PATCH net-next 09/10] devlink: Add a 'num

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Message-ID: <1757499891-596641-10-git-send-email-tariqt@nvidia.com>
Date: Wed, 10 Sep 2025 13:24:50 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>
CC: Jiri Pirko <jiri@...nulli.us>, Jonathan Corbet <corbet@....net>, "Leon
 Romanovsky" <leon@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>, Saeed Mahameed
	<saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>, Mark Bloch
	<mbloch@...dia.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
	<daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, "John
 Fastabend" <john.fastabend@...il.com>, <netdev@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <bpf@...r.kernel.org>, Gal Pressman
	<gal@...dia.com>, Cosmin Ratiu <cratiu@...dia.com>, Dragos Tatulea
	<dtatulea@...dia.com>, Jiri Pirko <jiri@...dia.com>
Subject: [PATCH net-next 09/10] devlink: Add a 'num_doorbells' driverinit param

From: Cosmin Ratiu <cratiu@...dia.com>

This parameter can be used by drivers to configure a different number of
doorbells.

Signed-off-by: Cosmin Ratiu <cratiu@...dia.com>
Reviewed-by: Dragos Tatulea <dtatulea@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 Documentation/networking/devlink/devlink-params.rst | 3 +++
 include/net/devlink.h                               | 4 ++++
 net/devlink/param.c                                 | 5 +++++
 3 files changed, 12 insertions(+)

diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
index c51da4fba7e7..0a9c20d70122 100644
--- a/Documentation/networking/devlink/devlink-params.rst
+++ b/Documentation/networking/devlink/devlink-params.rst
@@ -148,3 +148,6 @@ own name.
      - The max number of Virtual Functions (VFs) exposed by the PF.
        after reboot/pci reset, 'sriov_totalvfs' entry under the device's sysfs
        directory will report this value.
+   * - ``num_doorbells``
+     - u32
+     - Controls the number of doorbells used by the device.
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 8d4362f010e4..9e824f61e40f 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -531,6 +531,7 @@ enum devlink_param_generic_id {
 	DEVLINK_PARAM_GENERIC_ID_ENABLE_PHC,
 	DEVLINK_PARAM_GENERIC_ID_CLOCK_ID,
 	DEVLINK_PARAM_GENERIC_ID_TOTAL_VFS,
+	DEVLINK_PARAM_GENERIC_ID_NUM_DOORBELLS,
 
 	/* add new param generic ids above here*/
 	__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -598,6 +599,9 @@ enum devlink_param_generic_id {
 #define DEVLINK_PARAM_GENERIC_TOTAL_VFS_NAME "total_vfs"
 #define DEVLINK_PARAM_GENERIC_TOTAL_VFS_TYPE DEVLINK_PARAM_TYPE_U32
 
+#define DEVLINK_PARAM_GENERIC_NUM_DOORBELLS_NAME "num_doorbells"
+#define DEVLINK_PARAM_GENERIC_NUM_DOORBELLS_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 33134940c266..70e69523412c 100644
--- a/net/devlink/param.c
+++ b/net/devlink/param.c
@@ -107,6 +107,11 @@ static const struct devlink_param devlink_param_generic[] = {
 		.name = DEVLINK_PARAM_GENERIC_TOTAL_VFS_NAME,
 		.type = DEVLINK_PARAM_GENERIC_TOTAL_VFS_TYPE,
 	},
+	{
+		.id = DEVLINK_PARAM_GENERIC_ID_NUM_DOORBELLS,
+		.name = DEVLINK_PARAM_GENERIC_NUM_DOORBELLS_NAME,
+		.type = DEVLINK_PARAM_GENERIC_NUM_DOORBELLS_TYPE,
+	},
 };
 
 static int devlink_param_generic_verify(const struct devlink_param *param)
-- 
2.31.1