linux.git/net/devlink/port.c, branch v7.3-rc2

devlink: Expose external flag for PCI SF ports

2026-08-05T23:39:54+00:00

The external flag is part of the PCI SF port attributes, but unlike the
PCI PF and PCI VF flavours it was never filled into the port dump, so
userspace could not query it directly.

Reporting of the external flag was missed for SF ports. Hence, put
DEVLINK_ATTR_PORT_EXTERNAL for the PCI SF flavour as well, matching what
PCI PF and PCI VF ports already report.

$ devlink port show pci/0033:01:00.0/163840
 pci/0033:01:00.0/163840: type eth netdev eth1 flavour pcisf controller 1 pfnum 0 sfnum 77 external true splittable false

Reviewed-by: Parav Pandit 
Signed-off-by: Shay Drory 
Link: https://patch.msgid.link/20260803090012.257242-1-shayd@nvidia.com
Signed-off-by: Jakub Kicinski

devlink: print controller prefix for non-zero controller

2026-07-08T09:23:49+00:00

The controller prefix (c) in phys_port_name is currently restricted
to external host controllers. This layout sufficed when DPUs only had a
single local controller and one or more external host controllers.

However, newer devices can have multiple controllers within the DPU
itself, even within a single host environment. To support these
topologies, allow drivers to report the controller number regardless of
the "external" flag status. Any non-zero controller number will now be
explicitly reported, even for single-host or local DPU controllers.
Existing ports with controller=0 are unaffected.

Update documentation and kdoc to clarify that a non-zero controller
number does not require the external flag to be set.

Signed-off-by: Moshe Shemesh 
Reviewed-by: Parav Pandit 
Signed-off-by: Tariq Toukan 
Link: https://patch.msgid.link/20260702111726.816985-2-tariqt@nvidia.com
Signed-off-by: Paolo Abeni

devlink: Migrate from info->user_ptr to info->ctx

2026-07-07T09:31:26+00:00

Replace deprecated info->user_ptr[0]/[1] with a typed
devlink_nl_ctx struct stored in info->ctx. The struct aliases
the same union memory, so the migration is safe.

There are no functionality changes here.

Signed-off-by: Cosmin Ratiu 
Reviewed-by: Jiri Pirko 
Signed-off-by: Tariq Toukan 
Link: https://patch.msgid.link/20260701073254.754518-4-tariqt@nvidia.com
Signed-off-by: Paolo Abeni

devlink: Add port-level resource registration infrastructure

2026-04-09T02:55:38+00:00

The current devlink resource infrastructure supports only device-level
resources. Some hardware resources are associated with specific ports
rather than the entire device, and today we have no way to show resource
per-port.

Add support for registering resources at the port level.

Signed-off-by: Or Har-Toov 
Reviewed-by: Shay Drori 
Reviewed-by: Moshe Shemesh 
Reviewed-by: Jiri Pirko 
Signed-off-by: Tariq Toukan 
Link: https://patch.msgid.link/20260407194107.148063-3-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski

devlink: add devl_warn() helper and use it in port warnings

2026-03-14T20:08:49+00:00

Introduce devl_warn() macro that uses dev_warn() when a backing
device is available and falls back to pr_warn() otherwise. Convert
all dev_warn() calls in port.c to use it, preparing for devlink
instances without a backing device.

Signed-off-by: Jiri Pirko 
Link: https://patch.msgid.link/20260312100407.551173-10-jiri@resnulli.us
Signed-off-by: Jakub Kicinski

devlink: add helpers to get bus_name/dev_name

2026-03-14T20:08:47+00:00

Introduce devlink_bus_name() and devlink_dev_name() helpers and
convert all direct accesses to devlink->dev->bus->name and
dev_name(devlink->dev) to use them.

This prepares for dev-less devlink instances where these helpers
will be extended to handle the missing device.

Signed-off-by: Jiri Pirko 
Link: https://patch.msgid.link/20260312100407.551173-3-jiri@resnulli.us
Signed-off-by: Jakub Kicinski

devlink: expose devlink instance index over netlink

2026-03-14T20:08:46+00:00

Each devlink instance has an internally assigned index used for xarray
storage. Expose it as a new DEVLINK_ATTR_INDEX uint attribute alongside
the existing bus_name and dev_name handle.

Signed-off-by: Jiri Pirko 
Link: https://patch.msgid.link/20260312100407.551173-2-jiri@resnulli.us
Signed-off-by: Jakub Kicinski

devlink/port: Check attributes early and constify

2025-08-15T00:35:20+00:00

Constify the devlink port attributes to indicate they are read only
and does not depend on anything else. Therefore, validate it early
before setting in the devlink port.

Reviewed-by: Jiri Pirko 
Signed-off-by: Parav Pandit 
Link: https://patch.msgid.link/20250813094417.7269-3-parav@nvidia.com
Signed-off-by: Jakub Kicinski

devlink/port: Simplify return checks

2025-08-15T00:35:20+00:00

Drop always returning 0 from the helper routine and simplify
its callers.

Reviewed-by: Jiri Pirko 
Signed-off-by: Parav Pandit 
Link: https://patch.msgid.link/20250813094417.7269-2-parav@nvidia.com
Signed-off-by: Jakub Kicinski

devlink: let driver opt out of automatic phys_port_name generation

2025-08-12T20:23:39+00:00

Currently when adding devlink port, phys_port_name is automatically
generated within devlink port initialization flow. As a result adding
devlink port support to driver may result in forced changes of interface
names, which breaks already existing network configs.

This is an expected behavior but in some scenarios it would not be
preferable to provide such limitation for legacy driver not being able to
keep 'pre-devlink' interface name.

Add flag no_phys_port_name to devlink_port_attrs struct which indicates
if devlink should not alter name of interface.

Suggested-by: Jiri Pirko 
Link: https://lore.kernel.org/all/nbwrfnjhvrcduqzjl4a2jafnvvud6qsbxlvxaxilnryglf4j7r@btuqrimnfuly/
Signed-off-by: Jedrzej Jagielski 
Signed-off-by: Tony Nguyen