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Miller" , Jakub Kicinski Cc: jiri@nvidia.com, saeedm@nvidia.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Shay Drory , Moshe Shemesh Subject: [PATCH net-next v3 5/7] net/mlx5: Let user configure event_eq_size param Date: Wed, 8 Dec 2021 16:17:20 +0200 Message-Id: <20211208141722.13646-6-shayd@nvidia.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20211208141722.13646-1-shayd@nvidia.com> References: <20211208141722.13646-1-shayd@nvidia.com> X-ClientProxiedBy: AM5PR0502CA0011.eurprd05.prod.outlook.com (2603:10a6:203:91::21) To DM4PR12MB5373.namprd12.prod.outlook.com (2603:10b6:5:39a::17) MIME-Version: 1.0 Received: from nps-server-23.mtl.labs.mlnx (94.188.199.18) by AM5PR0502CA0011.eurprd05.prod.outlook.com (2603:10a6:203:91::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4755.17 via Frontend Transport; Wed, 8 Dec 2021 14:17:51 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 32a70bd1-8863-4eac-f716-08d9ba55864c X-MS-TrafficTypeDiagnostic: DM4PR12MB5117:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6430; 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Currently, each event EQ is taking 512KB of memory. This size is not needed in most use cases, and is critical with large scale. Hence, allow user to configure the size of the event EQ. For example to reduce event EQ size to 64, execute:: $ devlink dev param set pci/0000:00:0b.0 name event_eq_size value 64 \ cmode driverinit $ devlink dev reload pci/0000:00:0b.0 Signed-off-by: Shay Drory Reviewed-by: Moshe Shemesh --- Documentation/networking/devlink/mlx5.rst | 3 +++ .../net/ethernet/mellanox/mlx5/core/devlink.c | 7 +++++++ drivers/net/ethernet/mellanox/mlx5/core/eq.c | 16 +++++++++++++++- 3 files changed, 25 insertions(+), 1 deletion(-) diff --git a/Documentation/networking/devlink/mlx5.rst b/Documentation/networking/devlink/mlx5.rst index 291e7f63af73..38089f0aefcf 100644 --- a/Documentation/networking/devlink/mlx5.rst +++ b/Documentation/networking/devlink/mlx5.rst @@ -20,6 +20,9 @@ Parameters * - ``io_eq_size`` - driverinit - The range is between 64 and 4096. + * - ``event_eq_size`` + - driverinit + - The range is between 64 and 4096. The ``mlx5`` driver also implements the following driver-specific parameters. diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c index 177c6e9159f8..37b7600c5545 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c @@ -579,6 +579,8 @@ static const struct devlink_param mlx5_devlink_params[] = { mlx5_devlink_enable_remote_dev_reset_set, NULL), DEVLINK_PARAM_GENERIC(IO_EQ_SIZE, BIT(DEVLINK_PARAM_CMODE_DRIVERINIT), NULL, NULL, mlx5_devlink_eq_depth_validate), + DEVLINK_PARAM_GENERIC(EVENT_EQ_SIZE, BIT(DEVLINK_PARAM_CMODE_DRIVERINIT), + NULL, NULL, mlx5_devlink_eq_depth_validate), }; static void mlx5_devlink_set_params_init_values(struct devlink *devlink) @@ -622,6 +624,11 @@ static void mlx5_devlink_set_params_init_values(struct devlink *devlink) devlink_param_driverinit_value_set(devlink, DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE, value); + + value.vu32 = MLX5_NUM_ASYNC_EQE; + devlink_param_driverinit_value_set(devlink, + DEVLINK_PARAM_GENERIC_ID_EVENT_EQ_SIZE, + value); } static const struct devlink_param enable_eth_param = diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c index 7686d7c9c824..b695aad71ee1 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c @@ -623,6 +623,20 @@ static void cleanup_async_eq(struct mlx5_core_dev *dev, name, err); } +static u16 async_eq_depth_devlink_param_get(struct mlx5_core_dev *dev) +{ + struct devlink *devlink = priv_to_devlink(dev); + union devlink_param_value val; + int err; + + err = devlink_param_driverinit_value_get(devlink, + DEVLINK_PARAM_GENERIC_ID_EVENT_EQ_SIZE, + &val); + if (!err) + return val.vu32; + mlx5_core_dbg(dev, "Failed to get param. using default. err = %d\n", err); + return MLX5_NUM_ASYNC_EQE; +} static int create_async_eqs(struct mlx5_core_dev *dev) { struct mlx5_eq_table *table = dev->priv.eq_table; @@ -647,7 +661,7 @@ static int create_async_eqs(struct mlx5_core_dev *dev) param = (struct mlx5_eq_param) { .irq_index = MLX5_IRQ_EQ_CTRL, - .nent = MLX5_NUM_ASYNC_EQE, + .nent = async_eq_depth_devlink_param_get(dev), }; gather_async_events_mask(dev, param.mask);