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>

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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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20

Documentation/netlink/specs/devlink.yaml

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2

include/uapi/linux/devlink.h

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3

net/devlink/devl_internal.h

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36

net/devlink/netlink.c

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