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Fri, 12 Jun 2026 14:17:48 -0700 From: Dragos Tatulea To: Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Andrew Lunn , Pavel Begunkov , Jens Axboe CC: Dragos Tatulea , Yael Chemla , Tariq Toukan , , , Subject: [PATCH net-next v2 1/2] netdev: expose io_uring rx_page_order order via netlink Date: Sat, 13 Jun 2026 00:17:03 +0300 Message-ID: <20260612211709.1456966-3-dtatulea@nvidia.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260612211709.1456966-2-dtatulea@nvidia.com> References: <20260612211709.1456966-2-dtatulea@nvidia.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001F2:EE_|CH3PR12MB9343:EE_ X-MS-Office365-Filtering-Correlation-Id: e8eff030-4231-4d8d-6cd5-08dec8c81aca X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|36860700016|376014|7416014|1800799024|82310400026|56012099006|6133799003|18002099003|22082099003|11063799006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(23010399003)(36860700016)(376014)(7416014)(1800799024)(82310400026)(56012099006)(6133799003)(18002099003)(22082099003)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: HTwOTFMGv5t7lREF1N9MKrKKCx3nr9PFUanJ3/MxR5P1IbUPeBSzbve9YNKGL+kVjLlMN+lT+8yZUuE4gko72w0v3E4ME9s6bb2AQ4McESK9rWbq5XXRX4NX1MY0akMP9nZhcm8aHVKPqgKS94/5cIOKCFVdWMNIgFc8Fbcd9JjwZ5idrjZDjdloqfQBr+ZSCMliG3sMra2jp2QFzI5Apxb9+mJTp6YSbpb4X48Tk8NMrQfzxCe60zNVMjFb9DY40sszsmNDk8f8zJzKoUADylZgSSicp0YTNkSP4km7k7nkxgRwgcR1FPTZucK80wbaOEro8yHEW6VT+wHTJLbPXvR019QSVLzx50zWnFNdQdprg9dlrI70OdyQ5nn3LnCS5ZfOww2bcA7pAWmsHVTLqMAXVuANXckZdARArjJ6B5AAEBUm3b1zNcfQXjpKE3qG X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jun 2026 21:18:10.0324 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e8eff030-4231-4d8d-6cd5-08dec8c81aca X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001F2.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9343 This adds observability for the io_uring zcrx rx-buf-len configuration. Signed-off-by: Dragos Tatulea Reviewed-by: Yael Chemla Reviewed-by: Tariq Toukan --- Documentation/netlink/specs/netdev.yaml | 9 ++++++++- include/uapi/linux/netdev.h | 2 ++ io_uring/zcrx.c | 8 ++++++++ tools/include/uapi/linux/netdev.h | 2 ++ 4 files changed, 20 insertions(+), 1 deletion(-) diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml index 49862b666d7d..5f143da7458c 100644 --- a/Documentation/netlink/specs/netdev.yaml +++ b/Documentation/netlink/specs/netdev.yaml @@ -127,7 +127,14 @@ attribute-sets: enum: xsk-flags - name: io-uring-provider-info - attributes: [] + attributes: + - + name: rx-buf-len + type: uint + doc: | + RX buffer length in bytes for this io_uring memory provider. + Reflects the rx_buf_len passed at io_uring zerocopy rx + registration time. - name: page-pool attributes: diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h index 7df1056a35fd..2f3ab75e8cc0 100644 --- a/include/uapi/linux/netdev.h +++ b/include/uapi/linux/netdev.h @@ -97,6 +97,8 @@ enum { }; enum { + NETDEV_A_IO_URING_PROVIDER_INFO_RX_BUF_LEN = 1, + __NETDEV_A_IO_URING_PROVIDER_INFO_MAX, NETDEV_A_IO_URING_PROVIDER_INFO_MAX = (__NETDEV_A_IO_URING_PROVIDER_INFO_MAX - 1) }; diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c index 19837e0b5e91..c7b167c2d4e4 100644 --- a/io_uring/zcrx.c +++ b/io_uring/zcrx.c @@ -1156,6 +1156,7 @@ static void io_pp_zc_destroy(struct page_pool *pp) static int io_pp_nl_fill(void *mp_priv, struct sk_buff *rsp, struct netdev_rx_queue *rxq) { + struct io_zcrx_ifq *ifq = mp_priv; struct nlattr *nest; int type; @@ -1163,6 +1164,13 @@ static int io_pp_nl_fill(void *mp_priv, struct sk_buff *rsp, nest = nla_nest_start(rsp, type); if (!nest) return -EMSGSIZE; + + if (nla_put_uint(rsp, NETDEV_A_IO_URING_PROVIDER_INFO_RX_BUF_LEN, + 1ULL << ifq->niov_shift)) { + nla_nest_cancel(rsp, nest); + return -EMSGSIZE; + } + nla_nest_end(rsp, nest); return 0; diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h index 7df1056a35fd..2f3ab75e8cc0 100644 --- a/tools/include/uapi/linux/netdev.h +++ b/tools/include/uapi/linux/netdev.h @@ -97,6 +97,8 @@ enum { }; enum { + NETDEV_A_IO_URING_PROVIDER_INFO_RX_BUF_LEN = 1, + __NETDEV_A_IO_URING_PROVIDER_INFO_MAX, NETDEV_A_IO_URING_PROVIDER_INFO_MAX = (__NETDEV_A_IO_URING_PROVIDER_INFO_MAX - 1) }; -- 2.54.0