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devlink: Add parent dev to devlink API

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Upcoming changes to the rate commands need the parent devlink specified.
This change adds a nested 'parent-dev' attribute to the API and helpers
to obtain and put a reference to the parent devlink instance in
info->ctx.

To avoid deadlocks, the parent devlink is unlocked before obtaining the
main devlink instance that is the target of the request.
A reference to the parent is kept until the end of the request to avoid
it suddenly disappearing.

This means that this reference is of limited use without additional
protection.

Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Reviewed-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260701073254.754518-6-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Cosmin Ratiu
2026-07-01 10:32:45 +03:00
committed by Paolo Abeni
parent db078bc2b0
commit b5f90fd458
4 changed files with 56 additions and 5 deletions
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2
include/uapi/linux/devlink.h
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@@ -648,6 +648,8 @@ enum devlink_attr {
DEVLINK_ATTR_INDEX, /* uint */
DEVLINK_ATTR_RESOURCE_SCOPE_MASK, /* u32 */
DEVLINK_ATTR_PARENT_DEV, /* nested */
/* Add new attributes above here, update the spec in
* Documentation/netlink/specs/devlink.yaml and re-generate
* net/devlink/netlink_gen.c.