kernel/linux.git/Documentation/netlink, branch v6.18.21

net: shaper: protect from late creation of hierarchy

2026-03-25T10:10:43+00:00

[ Upstream commit d75ec7e8ba1979a1eb0b9211d94d749cdce849c8 ] We look up a netdev during prep of Netlink ops (pre- callbacks) and take a ref to it. Then later in the body of the callback we take its lock or RCU which are the actual protections. The netdev may get unregistered in between the time we take the ref and the time we lock it. We may allocate the hierarchy after flush has already run, which would lead to a leak. Take the instance lock in pre- already, this saves us from the race and removes the need for dedicated lock/unlock callbacks completely. After all, if there's any chance of write happening concurrently with the flush - we're back to leaking the hierarchy. We may take the lock for devices which don't support shapers but we're only dealing with SET operations here, not taking the lock would be optimizing for an error case. Fixes: 93954b40f6a4 ("net-shapers: implement NL set and delete operations") Link: https://lore.kernel.org/20260309173450.538026-1-p@1g4.org Signed-off-by: Jakub Kicinski Link: https://patch.msgid.link/20260317161014.779569-2-kuba@kernel.org Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin

dpll: add phase-adjust-gran pin attribute

2026-02-26T22:59:22+00:00

[ Upstream commit 30176bf7c871681df506f3165ffe76ec462db991 ] Phase-adjust values are currently limited by a min-max range. Some hardware requires, for certain pin types, that values be multiples of a specific granularity, as in the zl3073x driver. Add a `phase-adjust-gran` pin attribute and an appropriate field in dpll_pin_properties. If set by the driver, use its value to validate user-provided phase-adjust values. Reviewed-by: Michal Schmidt Reviewed-by: Petr Oros Tested-by: Prathosh Satish Signed-off-by: Ivan Vecera Reviewed-by: Jiri Pirko Reviewed-by: Arkadiusz Kubalewski Link: https://patch.msgid.link/20251029153207.178448-2-ivecera@redhat.com Signed-off-by: Jakub Kicinski Stable-dep-of: 5d41f95f5d0b ("dpll: zl3073x: Fix output pin phase adjustment sign") Signed-off-by: Sasha Levin

fou: Don't allow 0 for FOU_ATTR_IPPROTO.

2026-01-30T09:32:12+00:00

[ Upstream commit 7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5 ] fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO. Fixes: 23461551c0062 ("fou: Support for foo-over-udp RX path") Signed-off-by: Kuniyuki Iwashima Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20260115172533.693652-4-kuniyu@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

dpll: spec: add missing module-name and clock-id to pin-get reply

2025-10-28T01:20:36+00:00

The dpll.yaml spec incorrectly omitted module-name and clock-id from the pin-get operation reply specification, even though the kernel DPLL implementation has always included these attributes in pin-get responses since the initial implementation. This spec inconsistency caused issues with the C YNL code generator. The generated dpll_pin_get_rsp structure was missing these fields. Fix the spec by adding module-name and clock-id to the pin-attrs reply specification to match the actual kernel behavior. Fixes: 3badff3a25d8 ("dpll: spec: Add Netlink spec in YAML") Signed-off-by: Petr Oros Reviewed-by: Ivan Vecera Link: https://patch.msgid.link/20251024185512.363376-1-poros@redhat.com Signed-off-by: Jakub Kicinski

Merge tag 'char-misc-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2025-10-04T23:26:32+00:00

Pull Char/Misc/IIO/Binder updates from Greg KH: "Here is the big set of char/misc/iio and other driver subsystem changes for 6.18-rc1. Loads of different stuff in here, it was a busy development cycle in lots of different subsystems, with over 27k new lines added to the tree. Included in here are: - IIO updates including new drivers, reworking of existing apis, and other goodness in the sensor subsystems - MEI driver updates and additions - NVMEM driver updates - slimbus removal for an unused driver and some other minor updates - coresight driver updates and additions - MHI driver updates - comedi driver updates and fixes - extcon driver updates - interconnect driver additions - eeprom driver updates and fixes - minor UIO driver updates - tiny W1 driver updates But the majority of new code is in the rust bindings and additions, which includes: - misc driver rust binding updates for read/write support, we can now write "normal" misc drivers in rust fully, and the sample driver shows how this can be done. - Initial framework for USB driver rust bindings, which are disabled for now in the build, due to limited support, but coming in through this tree due to dependencies on other rust binding changes that were in here. I'll be enabling these back on in the build in the usb.git tree after -rc1 is out so that developers can continue to work on these in linux-next over the next development cycle. - Android Binder driver implemented in Rust. This is the big one, and was driving a huge majority of the rust binding work over the past years. Right now there are two binder drivers in the kernel, selected only at build time as to which one to use as binder wants to be included in the system at boot time. The binder C maintainers all agreed on this, as eventually, they want the C code to be removed from the tree, but it will take a few releases to get there while both are maintained to ensure that the rust implementation is fully stable and compliant with the existing userspace apis. All of these have been in linux-next for a while" * tag 'char-misc-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (320 commits) rust: usb: keep usb::Device private for now rust: usb: don't retain device context for the interface parent USB: disable rust bindings from the build for now samples: rust: add a USB driver sample rust: usb: add basic USB abstractions coresight: Add label sysfs node support dt-bindings: arm: Add label in the coresight components coresight: tnoc: add new AMBA ID to support Trace Noc V2 coresight: Fix incorrect handling for return value of devm_kzalloc coresight: tpda: fix the logic to setup the element size coresight: trbe: Return NULL pointer for allocation failures coresight: Refactor runtime PM coresight: Make clock sequence consistent coresight: Refactor driver data allocation coresight: Consolidate clock enabling coresight: Avoid enable programming clock duplicately coresight: Appropriately disable trace bus clocks coresight: Appropriately disable programming clocks coresight: etm4x: Support atclk coresight: catu: Support atclk ...

Revert "Documentation: net: add flow control guide and document ethtool API"

2025-10-01T07:48:21+00:00

This reverts commit 7bd80ed89d72285515db673803b021469ba71ee8. I should not have merged it to begin with due to pending review and changes to be addressed. Link: https://patch.msgid.link/c6f3af12df9b7998920a02027fc8893ce82afc4c.1759239721.git.pabeni@redhat.com Signed-off-by: Paolo Abeni

Documentation: net: add flow control guide and document ethtool API

2025-09-30T07:48:31+00:00

Introduce a new document, flow_control.rst, to provide a comprehensive guide on Ethernet Flow Control in Linux. The guide explains how flow control works, how autonegotiation resolves pause capabilities, and how to configure it using ethtool and Netlink. In parallel, document the pause and pause-stat attributes in the ethtool.yaml netlink spec. This enables the ynl tool to generate kernel-doc comments for the corresponding enums in the UAPI header, making the C interface self-documenting. Finally, replace the legacy flow control section in phy.rst with a reference to the new document and add pointers in the relevant C source files. Signed-off-by: Oleksij Rempel Link: https://patch.msgid.link/20250924120241.724850-1-o.rempel@pengutronix.de Signed-off-by: Paolo Abeni

dpll: add phase-offset-avg-factor device attribute to netlink spec

2025-09-30T01:57:41+00:00

Add dpll device level attribute DPLL_A_PHASE_OFFSET_AVG_FACTOR to allow control over a calculation of reported phase offset value. Attribute is present, if the driver provides such capability, otherwise attribute shall not be present. Signed-off-by: Ivan Vecera Reviewed-by: Vadim Fedorenko Link: https://patch.msgid.link/20250927084912.2343597-2-ivecera@redhat.com Signed-off-by: Jakub Kicinski

ethtool: add FEC bins histogram report

2025-09-26T23:49:18+00:00

IEEE 802.3ck-2022 defines counters for FEC bins and 802.3df-2024 clarifies it a bit further. Implement reporting interface through as addition to FEC stats available in ethtool. Drivers can leave bin counter uninitialized if per-lane values are provided. In this case the core will recalculate summ for the bin. Signed-off-by: Vadim Fedorenko Reviewed-by: Aleksandr Loktionov Link: https://patch.msgid.link/20250924124037.1508846-2-vadim.fedorenko@linux.dev Signed-off-by: Jakub Kicinski

mptcp: pm: netlink: deprecate server-side attribute

2025-09-22T18:51:24+00:00

Now that such info is in the 'flags' attribute, it is time to deprecate the dedicated 'server-side' attribute. It will be removed in a few versions. Reviewed-by: Geliang Tang Signed-off-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20250919-net-next-mptcp-server-side-flag-v1-3-a97a5d561a8b@kernel.org Signed-off-by: Jakub Kicinski