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devlink: support index-based lookup via bus_name/dev_name handle

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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 <jiri@nvidia.com>
Link: https://patch.msgid.link/20260312100407.551173-6-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiri Pirko
2026-03-14 13:08:48 -07:00
committed by Jakub Kicinski
parent d85a8af57d
commit 725d5fdb7b
2 changed files with 11 additions and 0 deletions
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include/uapi/linux/devlink.h
+2
View File
@@ -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,
net/devlink/netlink.c
+9
View File
@@ -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)