Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates
 203.18.50.14 as permitted sender) receiver=protection.outlook.com;
 client-ip=203.18.50.14; helo=mail.nvidia.com;
From:   Shay Drory <shayd@nvidia.com>
To:     "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
CC:     <jiri@nvidia.com>, <saeedm@nvidia.com>, <netdev@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, Shay Drory <shayd@nvidia.com>,
        Moshe Shemesh <moshe@nvidia.com>
Subject: [PATCH net-next v2 1/6] devlink: Add new "io_eq_size" generic device param
Date:   Wed, 8 Dec 2021 09:00:01 +0200
Message-ID: <20211208070006.13100-2-shayd@nvidia.com>
In-Reply-To: <20211208070006.13100-1-shayd@nvidia.com>
References: <20211208070006.13100-1-shayd@nvidia.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Dec 2021 07:00:36.6502
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: dac00f2f-d568-4aff-9b4a-08d9ba187005
X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[203.18.50.14];Helo=[mail.nvidia.com]
X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT060.eop-nam11.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB3014
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Add new device generic parameter to determine the size of the
I/O completion EQs.

For example, to reduce I/O EQ size to 64, execute:
$ devlink dev param set pci/0000:06:00.0 \
              name io_eq_size value 64 cmode driverinit
$ devlink dev reload pci/0000:06:00.0

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
---
 Documentation/networking/devlink/devlink-params.rst | 3 +++
 include/net/devlink.h                               | 4 ++++
 net/core/devlink.c                                  | 5 +++++
 3 files changed, 12 insertions(+)

diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
index b7dfe693a332..cd9342305a13 100644
--- a/Documentation/networking/devlink/devlink-params.rst
+++ b/Documentation/networking/devlink/devlink-params.rst
@@ -129,3 +129,6 @@ own name.
        will NACK any attempt of other host to reset the device. This parameter
        is useful for setups where a device is shared by different hosts, such
        as multi-host setup.
+   * - ``io_eq_size``
+     - u16
+     - Control the size of I/O completion EQs.
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 3276a29f2b81..61efa45b8786 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -459,6 +459,7 @@ enum devlink_param_generic_id {
 	DEVLINK_PARAM_GENERIC_ID_ENABLE_RDMA,
 	DEVLINK_PARAM_GENERIC_ID_ENABLE_VNET,
 	DEVLINK_PARAM_GENERIC_ID_ENABLE_IWARP,
+	DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
 
 	/* add new param generic ids above here*/
 	__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -511,6 +512,9 @@ enum devlink_param_generic_id {
 #define DEVLINK_PARAM_GENERIC_ENABLE_IWARP_NAME "enable_iwarp"
 #define DEVLINK_PARAM_GENERIC_ENABLE_IWARP_TYPE DEVLINK_PARAM_TYPE_BOOL
 
+#define DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_NAME "io_eq_size"
+#define DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_TYPE DEVLINK_PARAM_TYPE_U16
+
 #define DEVLINK_PARAM_GENERIC(_id, _cmodes, _get, _set, _validate)	\
 {									\
 	.id = DEVLINK_PARAM_GENERIC_ID_##_id,				\
diff --git a/net/core/devlink.c b/net/core/devlink.c
index db3b52110cf2..0d4e63d11585 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4466,6 +4466,11 @@ static const struct devlink_param devlink_param_generic[] = {
 		.name = DEVLINK_PARAM_GENERIC_ENABLE_IWARP_NAME,
 		.type = DEVLINK_PARAM_GENERIC_ENABLE_IWARP_TYPE,
 	},
+	{
+		.id = DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
+		.name = DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_NAME,
+		.type = DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_TYPE,
+	},
 };
 
 static int devlink_param_generic_verify(const struct devlink_param *param)
-- 
2.21.3