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Thu, 12 Mar 2026 03:04:14 -0700 (PDT) From: Jiri Pirko To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, donald.hunter@gmail.com, corbet@lwn.net, skhan@linuxfoundation.org, saeedm@nvidia.com, leon@kernel.org, tariqt@nvidia.com, mbloch@nvidia.com, przemyslaw.kitszel@intel.com, mschmidt@redhat.com, andrew+netdev@lunn.ch, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, chuck.lever@oracle.com, matttbe@kernel.org, cjubran@nvidia.com, daniel.zahka@gmail.com, linux-doc@vger.kernel.org, linux-rdma@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH net-next v4 05/13] devlink: support index-based lookup via bus_name/dev_name handle Date: Thu, 12 Mar 2026 11:03:59 +0100 Message-ID: <20260312100407.551173-6-jiri@resnulli.us> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260312100407.551173-1-jiri@resnulli.us> References: <20260312100407.551173-1-jiri@resnulli.us> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Jiri Pirko Devlink instances without a backing device use bus_name "devlink_index" and dev_name set to the decimal index string. When user space sends this handle, detect the pattern and perform a direct xarray lookup by index instead of iterating all instances. Signed-off-by: Jiri Pirko --- v2->v3: - unify return value -ENODEV even in case non-numeric dev_name v1->v2: - moved DEVLINK_INDEX_BUS_NAME definition here from patch #7 --- include/uapi/linux/devlink.h | 2 ++ net/devlink/netlink.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h index 1ba3436db4ae..7de2d8cc862f 100644 --- a/include/uapi/linux/devlink.h +++ b/include/uapi/linux/devlink.h @@ -19,6 +19,8 @@ #define DEVLINK_GENL_VERSION 0x1 #define DEVLINK_GENL_MCGRP_CONFIG_NAME "config" +#define DEVLINK_INDEX_BUS_NAME "devlink_index" + enum devlink_command { /* don't change the order or add anything between, this is ABI! */ DEVLINK_CMD_UNSPEC, diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c index 9cba40285de4..fa38fca22fe4 100644 --- a/net/devlink/netlink.c +++ b/net/devlink/netlink.c @@ -203,6 +203,15 @@ devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs, busname = nla_data(attrs[DEVLINK_ATTR_BUS_NAME]); devname = nla_data(attrs[DEVLINK_ATTR_DEV_NAME]); + if (!strcmp(busname, DEVLINK_INDEX_BUS_NAME)) { + if (kstrtoul(devname, 10, &index)) + return ERR_PTR(-ENODEV); + devlink = devlinks_xa_lookup_get(net, index); + if (!devlink) + return ERR_PTR(-ENODEV); + goto found; + } + devlinks_xa_for_each_registered_get(net, index, devlink) { if (strcmp(devlink_bus_name(devlink), busname) == 0 && strcmp(devlink_dev_name(devlink), devname) == 0) -- 2.51.1