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Thu, 13 Feb 2025 10:02:31 -0800 From: Tariq Toukan To: "David S. Miller" , Jakub Kicinski , Paolo Abeni , Eric Dumazet , "Andrew Lunn" , Jiri Pirko CC: Cosmin Ratiu , Carolina Jubran , Gal Pressman , Mark Bloch , Donald Hunter , Jiri Pirko , Jonathan Corbet , Saeed Mahameed , Leon Romanovsky , Tariq Toukan , , , , Subject: [PATCH net-next 06/10] devlink: Allow rate node parents from other devlinks Date: Thu, 13 Feb 2025 20:01:30 +0200 Message-ID: <20250213180134.323929-7-tariqt@nvidia.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20250213180134.323929-1-tariqt@nvidia.com> References: <20250213180134.323929-1-tariqt@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH1PEPF0000AD7D:EE_|BY5PR12MB4162:EE_ X-MS-Office365-Filtering-Correlation-Id: 4cf7768e-7691-4657-a796-08dd4c58a5de X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|82310400026|1800799024|376014|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?SbCReYfU2nrcz8H4HLlHFIO6ar8vEVlgXNTaMBeukChkDf7eE8Wgi9fwihCm?= =?us-ascii?Q?rB/6oba49NPo5mLKrNhfq/bLo4kH0Oxbuqt1JXkV8cNvj7JGKD7sFmLmpCoJ?= =?us-ascii?Q?6a7YZ3I5CZLn5NcVLl7rnaHlfPLm1Utc5PMg91s9nddDkqKrg0QhJtYYNNLv?= =?us-ascii?Q?OnsejSEAB57s+H+JXp4IqpiYfWhj45pKPHKmBvVjFW5K5ck6OY6W7uLC5jjo?= =?us-ascii?Q?RgRe2abJyfrkUJkNUvUD/7gad/Sh58aa1nJtxKwaREFfLpIOpExMygKxTPwc?= =?us-ascii?Q?0ALwcFvIGWPZjIHJzAo29fge+BvsQ4UwCqf6BHsim6KW3+0z+oM8/3sOni1w?= =?us-ascii?Q?3UvvtjIIwEnJWqstr3UBlhzzti/3J2ZoThJFVXKQDmsHmP59+7aRNcetNkbr?= =?us-ascii?Q?KGU34Jocr1G8N0vNTGKfykcax6SwaaVtyDQ5+/RWGihpDQW68/yBuNrrEmvb?= =?us-ascii?Q?uAy30eIWX/JJbx9T+3X7M/UyrJ4QExz9wKX4mBD9kR6RViefwa793nzM1Hv9?= =?us-ascii?Q?/n+hnXs63rLssv/oRU/415UJz4tN0WCKNk4H2BEA1rYglQO/KuRq+pc1HB/t?= =?us-ascii?Q?h+jJI2vX2Hv9LYpKYuVKVEvQuKgGSLNDml/H9pL6fCBtoj5FhUALI/9zaZ+G?= =?us-ascii?Q?+dVYesN+vokW8L6WEFheqsfmmr83RA9qSfKeyJrH5JwDxa8ZzjaeFANvQ+aK?= =?us-ascii?Q?oeVnYJMswSaAQNtpE/3V29IPm1JiwrB3jOTOMdJkqh37rc9xCUODBl5OU+fW?= =?us-ascii?Q?YeK7UFUZC2exDx80P6PvPGGFjkQyWiuAJhxRM/RkItdHOW2c9VwvmjqDGilp?= =?us-ascii?Q?1V2Qs5tFJQz9LvA3WcG3f1jwmdI8WEbtl2Z+L9j14e1T8wsYoiZUVFgLpBV/?= =?us-ascii?Q?kzghaxUTAza5x95dypyn0yRVTKlciaQYH9/ILVtebKR88ZFT7YLO+Xr5yd4N?= =?us-ascii?Q?KrWwg/NcTdYfXV4tX5ZK6VH4DWaHWTsTlCsQ2yimyiwZQA/RDJPO3zRYSvvP?= =?us-ascii?Q?xZxGVUiLsAKc+8Fn1X/Ze2hXQs+ROoc55C6wb4t4jI2yeKqDMvq2NY1F5beY?= =?us-ascii?Q?drwlKgulPM/3V5GHRUDTTGanVjX4fAkqpkt6FSDas5nYI3bUuar89Ar/cX/x?= =?us-ascii?Q?mD5gc9lL4MotVOOlXGBmJtm0NgG45JEO/paIddMQrrZnRWrDD6VLadDRwL98?= =?us-ascii?Q?v5PWHPwGLlTuV51NVQzF/xKvi/rm5hkaTr+vqaJBPj7UwhwjaCtqQ5YM9Ph+?= =?us-ascii?Q?CX1wWAg40FDTUP00+qKtl0iZXSxUXKtMotw5PWTmPOruggcA+jtEErdNnSdV?= =?us-ascii?Q?wzdfRrK9RtsHCoUkiiFolSZCnitDZ7XR8hQqnXnEZboILkayrHYebnKCwZVe?= =?us-ascii?Q?jY/PIrMzNhlyhrdxgCJQRlEUsbid70nGkElRLEPWU1gEXo4QTctZEumIpQ+O?= =?us-ascii?Q?rMbHUJXsXrqWBt2uYeT7c0UAxIWUo4VoG7uUn8JuqAdBtRHifPzc8w=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(36860700013)(82310400026)(1800799024)(376014)(7416014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2025 18:02:57.8425 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4cf7768e-7691-4657-a796-08dd4c58a5de X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000AD7D.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4162 Content-Type: text/plain; charset="utf-8" From: Cosmin Ratiu This commit make use of the unlocked parent devlink from info->user_ptr[1] to assign a devlink rate node to the requested parent node. Because it is not locked, none of its mutable fields can be used. But parent setting only requires: 1. Verifying that the same rate domain is used. The rate domain is immutable once set, so this is safe. 2. Comparing devlink_rate->devlink with the requested parent devlink. As the shared devlink rate domain is locked, other entities cannot concurrently make changes to any of its rates. Signed-off-by: Cosmin Ratiu Reviewed-by: Carolina Jubran Signed-off-by: Tariq Toukan --- net/devlink/rate.c | 46 +++++++++++++++++++++++++++++++++++++++------- 1 file changed, 39 insertions(+), 7 deletions(-) diff --git a/net/devlink/rate.c b/net/devlink/rate.c index 38f18216eb80..e6b4f4cb8a01 100644 --- a/net/devlink/rate.c +++ b/net/devlink/rate.c @@ -125,10 +125,26 @@ static int devlink_nl_rate_fill(struct sk_buff *msg, devlink_rate->tx_weight)) goto nla_put_failure; =20 - if (devlink_rate->parent) - if (nla_put_string(msg, DEVLINK_ATTR_RATE_PARENT_NODE_NAME, - devlink_rate->parent->name)) + if (devlink_rate->parent) { + struct devlink_rate *parent =3D devlink_rate->parent; + + if (nla_put_string(msg, DEVLINK_ATTR_RATE_PARENT_NODE_NAME, parent->name= )) goto nla_put_failure; + if (parent->devlink !=3D devlink) { + /* The parent devlink isn't locked, but a reference to + * it is held so it cannot suddenly disappear. + * And since there are rate nodes pointing to it, + * the parent devlink is fully initialized and + * the fields accessed here are valid and immutable. + */ + if (nla_put_string(msg, DEVLINK_ATTR_PARENT_DEV_BUS_NAME, + parent->devlink->dev->bus->name)) + goto nla_put_failure; + if (nla_put_string(msg, DEVLINK_ATTR_PARENT_DEV_NAME, + dev_name(parent->devlink->dev))) + goto nla_put_failure; + } + } =20 genlmsg_end(msg, hdr); return 0; @@ -281,9 +297,18 @@ devlink_nl_rate_parent_node_set(struct devlink_rate *d= evlink_rate, const char *parent_name =3D nla_data(nla_parent); const struct devlink_ops *ops =3D devlink->ops; size_t len =3D strlen(parent_name); + struct devlink *parent_devlink; struct devlink_rate *parent; int err =3D -EOPNOTSUPP; =20 + parent_devlink =3D info->user_ptr[1] ? : devlink; + if (parent_devlink !=3D devlink) { + if (parent_devlink->rate_domain !=3D devlink->rate_domain) { + NL_SET_ERR_MSG(info->extack, + "Cannot set parent to a rate from a different rate domain"); + return -EINVAL; + } + } parent =3D devlink_rate->parent; =20 if (parent && !len) { @@ -301,7 +326,11 @@ devlink_nl_rate_parent_node_set(struct devlink_rate *d= evlink_rate, refcount_dec(&parent->refcnt); devlink_rate->parent =3D NULL; } else if (len) { - parent =3D devlink_rate_node_get_by_name(devlink, parent_name); + /* parent_devlink (if !=3D devlink) isn't locked, but the rate + * domain, immutable once set, is already locked and the parent + * is only used to determine node owner via pointer comparison. + */ + parent =3D devlink_rate_node_get_by_name(parent_devlink, parent_name); if (IS_ERR(parent)) return -ENODEV; =20 @@ -762,8 +791,8 @@ EXPORT_SYMBOL_GPL(devl_rate_leaf_destroy); * devl_rate_nodes_destroy - destroy all devlink rate nodes on device * @devlink: devlink instance * - * Unset parent for all rate objects and destroy all rate nodes - * on specified device. + * Unset parent for all rate objects that involve this device and destroy = all + * rate nodes on it. */ void devl_rate_nodes_destroy(struct devlink *devlink) { @@ -774,7 +803,9 @@ void devl_rate_nodes_destroy(struct devlink *devlink) devl_rate_domain_lock(devlink); =20 list_for_each_entry(devlink_rate, &devlink->rate_domain->rate_list, list)= { - if (!devlink_rate->parent || devlink_rate->devlink !=3D devlink) + if (!devlink_rate->parent || + (devlink_rate->devlink !=3D devlink && + devlink_rate->parent->devlink !=3D devlink)) continue; =20 refcount_dec(&devlink_rate->parent->refcnt); @@ -784,6 +815,7 @@ void devl_rate_nodes_destroy(struct devlink *devlink) else if (devlink_rate_is_node(devlink_rate)) ops->rate_node_parent_set(devlink_rate, NULL, devlink_rate->priv, NULL, NULL); + devlink_rate->parent =3D NULL; } list_for_each_entry_safe(devlink_rate, tmp, &devlink->rate_domain->rate_l= ist, list) { if (devlink_rate->devlink =3D=3D devlink && devlink_rate_is_node(devlink= _rate)) { --=20 2.45.0