Changes in Kconfig

8a398a0c189ead8bbce98f5be70b8ea0e30b21f8 - appletalk: move the protocol out of tree

Tue, 16 Jun 2026 00:29:35 +0200

appletalk: move the protocol out of treeAppleTalk has been removed in MacOS X 10.6 (Snow Leopard), in 2009,according to Wikipedia. We recently got a burst of AI generatedfixes to this protocol which nobody is reviewing.Let AppleTalk follow AX.25 and hamradio out of the Linux tree.We we will maintain the code at: github.com/linux-netdev/mod-orphanfor anyone interested in playing with it.Retain the uAPI for now. No strong reason, simply because I suspectkeeping it will be less controversial.Acked-by: Stephen Hemminger Link: https://patch.msgid.link/20260615222935.947233-3-kuba@kernel.orgSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

dd8d4bc28ad7252610d8e79c1313a2d1e3499a51 - net: remove ax25 and amateur radio (hamradio) subsystem

Tue, 21 Apr 2026 04:18:23 +0200

net: remove ax25 and amateur radio (hamradio) subsystemRemove the amateur radio (AX.25, NET/ROM, ROSE) protocol implementationand all associated hamradio device drivers from the kernel tree.This set of protocols has long been a huge bug/syzbot magnet,and since nobody stepped up to help us deal with the influxof the AI-generated bug reports we need to move it out of treeto protect our sanity.The code is moved to an out-of-tree repo:https://github.com/linux-netdev/mod-orphanif it's cleaned up and reworked there we can accept it back.Minimal stub headers are kept for include/net/ax25.h (AX25_P_IP,AX25_ADDR_LEN, ax25_address) and include/net/rose.h (ROSE_ADDR_LEN)so that the conditional integration code in arp.c and tun.c continuesto compile and work when the out-of-tree modules are loaded.Signed-off-by: Jakub Kicinski Acked-by: Greg Kroah-Hartman Acked-by: Stephen Hemminger Acked-by: Carlos Bilbao Reviewed-by: Simon Horman Reviewed-by: Kuniyuki Iwashima Acked-by: Toke Høiland-Jørgensen Link: https://patch.msgid.link/20260421021824.1293976-1-kuba@kernel.orgSigned-off-by: Paolo Abeni List of files: /linux/net/Kconfig

6d5431555de032f5ad9e08a7fb372f37bf493903 - caif: remove CAIF NETWORK LAYER

Thu, 16 Apr 2026 20:28:28 +0200

caif: remove CAIF NETWORK LAYERRemove CAIF (Communication CPU to Application CPU Interface), theST-Ericsson modem protocol. The subsystem has been orphaned since 2013.The last meaningful changes from the maintainers were in March 2013: a8c7687bf216 ("caif_virtio: Check that vringh_config is not null") b2273be8d2df ("caif_virtio: Use vringh_notify_enable correctly") 0d2e1a2926b1 ("caif_virtio: Introduce caif over virtio")Not-so-coincidentally, according to "the Internet" ST-Ericsson officiallyshut down its modem joint venture in Aug 2013.If anyone is using this code please yell!In the 13 years since, the code has accumulated 200 non-merge commits,of which 71 were cross-tree API changes, 21 carried Fixes: tags, andthe remaining ~110 were cleanups, doc conversions, treewide refactors,and one partial removal (caif_hsi, ca75bcf0a83b).We are still getting fixes to this code, in the last 10 days there were3 reports on security@ about CAIF that I have been CCed on.UAPI constants (AF_CAIF, ARPHRD_CAIF, N_CAIF, VIRTIO_ID_CAIF) and theSELinux classmap entry are intentionally kept for ABI stability.Acked-by: Michael S. Tsirkin Acked-by: Greg Kroah-Hartman Reviewed-by: Linus Walleij Reviewed-by: Simon Horman Link: https://patch.msgid.link/20260416182829.1440262-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

2af8ff1e472e9862983303890e98d45f40863351 - net: Kconfig: discourage drop_monitor enablement

Thu, 16 Oct 2025 13:51:47 +0200

net: Kconfig: discourage drop_monitor enablementQuoting Eric Dumazet:"I do not understand the fascination with net/core/drop_monitor.c [..]misses all the features, flexibility, scalability that 'perf',eBPF tracing, bpftrace, .... have today."Reword DROP_MONITOR kconfig help text to clearly state that its notrelated to perf-based drop monitoring and that its safe to disablethis unless support for the older netlink-based tools is needed.Signed-off-by: Florian Westphal Reviewed-by: Simon Horman Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20251016115147.18503-1-fw@strlen.deSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

35758b0032c056cdff3e8f5a70669cb3e2c8d0e4 - dibs: Create drivers/dibs

Thu, 18 Sep 2025 13:04:49 +0200

dibs: Create drivers/dibsCreate the file structure for a 'DIBS - Direct Internal Buffer Sharing'shim layer that will provide generic functionality and declarations fordibs device drivers and dibs clients.Following patches will add functionality.Signed-off-by: Alexandra Winter Link: https://patch.msgid.link/20250918110500.1731261-4-wintera@linux.ibm.comSigned-off-by: Paolo Abeni List of files: /linux/net/Kconfig

00c94ca2b99e6610e483f92e531b319eeaed94aa - psp: base PSP device support

Wed, 17 Sep 2025 02:09:29 +0200

psp: base PSP device supportAdd a netlink family for PSP and allow drivers to register support.The "PSP device" is its own object. This allows us to perform moreflexible reference counting / lifetime control than if PSP informationwas part of net_device. In the future we should also be ableto "delegate" PSP access to software devices, such as *vlan, vethor netkit more easily.Reviewed-by: Willem de Bruijn Signed-off-by: Jakub Kicinski Signed-off-by: Daniel Zahka Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20250917000954.859376-3-daniel.zahka@gmail.comSigned-off-by: Paolo Abeni List of files: /linux/net/Kconfig

b2dd6eb0acd756a48a5351c56a675e2e7ff45e70 - net: Kconfig: add endif/endmenu comments

Mon, 21 Jul 2025 04:04:20 +0200

net: Kconfig: add endif/endmenu commentsAdd comments on endif & endmenu blocks. This can save timewhen searching & trying to understand kconfig menu dependencies.The other endif & endmenu statements are already commented like this.This makes it similar to drivers/net/Kconfig, which is alreadycommented like this.Signed-off-by: Randy Dunlap Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250721020420.3555128-1-rdunlap@infradead.orgSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

cb575e5e9fd1cba99f1514c36375e74609f92e70 - net: Kconfig NET_DEVMEM selects GENERIC_ALLOCATOR

Thu, 22 May 2025 23:41:16 +0200

net: Kconfig NET_DEVMEM selects GENERIC_ALLOCATORGENERIC_ALLOCATOR is a non-prompt kconfig, meaning users can't enable itselectively. All kconfig users of GENERIC_ALLOCATOR select it, except ofNET_DEVMEM which only depends on it, there is no easy way to turnGENERIC_ALLOCATOR on unless we select other unnecessary configs thatwill select it.Instead of depending on it, select it when NET_DEVMEM is enabled.Signed-off-by: Saeed Mahameed Reviewed-by: Dragos Tatulea Signed-off-by: Cosmin Ratiu Signed-off-by: Tariq Toukan Reviewed-by: Mina Almasry Link: https://patch.msgid.link/1747950086-1246773-2-git-send-email-tariqt@nvidia.comSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

55d22ee0358597185f8f5272558ec7cf1a49eb41 - net: introduce CONFIG_NET_CRC32C

Mon, 19 May 2025 19:50:03 +0200

net: introduce CONFIG_NET_CRC32CAdd a hidden kconfig symbol NET_CRC32C that will group together thefunctions that calculate CRC32C checksums of packets, so that thesedon't have to be built into NET-enabled kernels that don't need them.Make skb_crc32c_csum_help() (which is called only when IP_SCTP isenabled) conditional on this symbol, and make IP_SCTP select it.Signed-off-by: Eric Biggers Reviewed-by: Hannes Reinecke Link: https://patch.msgid.link/20250519175012.36581-2-ebiggers@kernel.orgSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

2a63dd0edf388802074f1d4d6b588a3b4c380688 - net: Retire DCCP socket.

Thu, 10 Apr 2025 04:36:45 +0200

net: Retire DCCP socket.DCCP was orphaned in 2021 by commit 054c4610bd05 ("MAINTAINERS: dccp:move Gerrit Renker to CREDITS"), which noted that the last maintainerhad been inactive for five years.In recent years, it has become a playground for syzbot, and most changesto DCCP have been odd bug fixes triggered by syzbot. Apart from that,the only changes have been driven by treewide or networking API updatesor adjustments related to TCP.Thus, in 2023, we announced we would remove DCCP in 2025 via commitb144fcaf46d4 ("dccp: Print deprecation notice.").Since then, only one individual has contacted the netdev mailing list. [0]There is ongoing research for Multipath DCCP. The repository is hostedon GitHub [1], and development is not taking place through the upstreamcommunity. While the repository is published under the GPLv2 license,the scheduling part remains proprietary, with a LICENSE file [2] stating: "This is not Open Source software."The researcher mentioned a plan to address the licensing issue, upstreamthe patches, and step up as a maintainer, but there has been no furthercommunication since then.Maintaining DCCP for a decade without any real users has become a burden.Therefore, it's time to remove it.Removing DCCP will also provide significant benefits to TCP. It allowsus to freely reorganize the layout of struct inet_connection_sock, whichis currently shared with DCCP, and optimize it to reduce the number ofcachelines accessed in the TCP fast path.Note that we keep DCCP netfilter modules as requested. [3]Link: https://lore.kernel.org/netdev/20230710182253.81446-1-kuniyu@amazon.com/T/#u #[0]Link: https://github.com/telekom/mp-dccp #[1]Link: https://github.com/telekom/mp-dccp/blob/mpdccp_v03_k5.10/net/dccp/non_gpl_scheduler/LICENSE #[2]Link: https://lore.kernel.org/netdev/Z_VQ0KlCRkqYWXa-@calendula/ #[3]Signed-off-by: Kuniyuki Iwashima Acked-by: Paul Moore (LSM and SELinux)Acked-by: Casey Schaufler Link: https://patch.msgid.link/20250410023921.11307-3-kuniyu@amazon.comSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

04e65df94b3112a1b319b6deb5bab83fd740bc7d - netlink: spec: add shaper YAML spec

Wed, 09 Oct 2024 10:09:48 +0200

netlink: spec: add shaper YAML specDefine the user-space visible interface to query, configure and deletenetwork shapers via yaml definition.Add dummy implementations for the relevant NL callbacks.set() and delete() operations touch a single shaper creating/updating ordeleting it.The group() operation creates a shaper's group, nesting multiple inputshapers under the specified output shaper.Reviewed-by: Jiri Pirko Signed-off-by: Paolo Abeni Link: https://patch.msgid.link/7a33a1ff370bdbcd0cd3f909575c912cd56f41da.1728460186.git.pabeni@redhat.comSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

26d7460222a0be34ff61a92a1fcc4469797ad937 - memory-provider: disable building dmabuf mp on !CONFIG_PAGE_POOL

Fri, 13 Sep 2024 08:07:45 +0200

memory-provider: disable building dmabuf mp on !CONFIG_PAGE_POOLWhen CONFIG_TRACEPOINTS=y but CONFIG_PAGE_POOL=n, we end up with thisbuild failure that is reported by the 0-day bot:ld: vmlinux.o: in function `mp_dmabuf_devmem_alloc_netmems':>> (.text+0xc37286): undefined reference to `__tracepoint_page_pool_state_hold'>> ld: (.text+0xc3729a): undefined reference to `__SCT__tp_func_page_pool_state_hold'>> ld: vmlinux.o:(__jump_table+0x10c48): undefined reference to `__tracepoint_page_pool_state_hold'>> ld: vmlinux.o:(.static_call_sites+0xb824): undefined reference to `__SCK__tp_func_page_pool_state_hold'The root cause is that in this configuration, traces are enabled but thepage_pool specific trace_page_pool_state_hold is not registered.There is no reason to build the dmabuf memory provider whenCONFIG_PAGE_POOL is not present, as it's really a provider to thepage_pool.In fact the whole NET_DEVMEM is RX path-only at the moment, so we canmake the entire config dependent on the PAGE_POOL.Note that this may need to be revisited after/while devmem TX isadded, as devmem TX likely does not need CONFIG_PAGE_POOL. For now thisbuild fix is sufficient.Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202409131239.ysHQh4Tv-lkp@intel.com/Signed-off-by: Mina Almasry Reviewed-by: Simon Horman Tested-by: Simon Horman # build-testedLink: https://patch.msgid.link/20240913060746.2574191-1-almasrymina@google.comSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

170aafe35cb98e0f3fbacb446ea86389fbce22ea - netdev: support binding dma-buf to netdevice

Tue, 10 Sep 2024 19:14:47 +0200

netdev: support binding dma-buf to netdeviceAdd a netdev_dmabuf_binding struct which represents thedma-buf-to-netdevice binding. The netlink API will bind the dma-buf torx queues on the netdevice. On the binding, the dma_buf_attach& dma_buf_map_attachment will occur. The entries in the sg_table frommapping will be inserted into a genpool to make it readyfor allocation.The chunks in the genpool are owned by a dmabuf_chunk_owner struct whichholds the dma-buf offset of the base of the chunk and the dma_addr ofthe chunk. Both are needed to use allocations that come from this chunk.We create a new type that represents an allocation from the genpool:net_iov. We setup the net_iov allocation size in thegenpool to PAGE_SIZE for simplicity: to match the PAGE_SIZE normallyallocated by the page pool and given to the drivers.The user can unbind the dmabuf from the netdevice by closing the netlinksocket that established the binding. We do this so that the binding isautomatically unbound even if the userspace process crashes.The binding and unbinding leaves an indicator in struct netdev_rx_queuethat the given queue is bound, and the binding is actuated by resettingthe rx queue using the queue API.The netdev_dmabuf_binding struct is refcounted, and releases itsresources only when all the refs are released.Signed-off-by: Willem de Bruijn Signed-off-by: Kaiyuan Zhang Signed-off-by: Mina Almasry Reviewed-by: Pavel Begunkov # excluding netlinkAcked-by: Daniel Vetter Reviewed-by: Jakub Kicinski Link: https://patch.msgid.link/20240910171458.219195-4-almasrymina@google.comSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

f750dfe825b904164688adeb147950e0e0c4d262 - ethtool: provide customized dim profile management

Fri, 21 Jun 2024 12:13:51 +0200

ethtool: provide customized dim profile managementThe NetDIM library, currently leveraged by an array of NICs, deliversexcellent acceleration benefits. Nevertheless, NICs vary significantlyin their dim profile list prerequisites.Specifically, virtio-net backends may present diverse sw or hw deviceimplementation, making a one-size-fits-all parameter list impractical.On Alibaba Cloud, the virtio DPU's performance under the default DIMprofile falls short of expectations, partly due to a mismatch inparameter configuration.I also noticed that ice/idpf/ena and other NICs have customizedprofilelist or placed some restrictions on dim capabilities.Motivated by this, I tried adding new params for "ethtool -C" that providesa per-device control to modify and access a device's interrupt parameters.Usage========The target NIC is named ethx.Assume that ethx only declares support for rx profile setting(with DIM_PROFILE_RX flag set in profile_flags) and supports modificationof usec and pkt fields.1. Query the currently customized list of the device$ ethtool -c ethx...rx-profile:{.usec = 1, .pkts = 256, .comps = n/a,},{.usec = 8, .pkts = 256, .comps = n/a,},{.usec = 64, .pkts = 256, .comps = n/a,},{.usec = 128, .pkts = 256, .comps = n/a,},{.usec = 256, .pkts = 256, .comps = n/a,}tx-profile: n/a2. Tune$ ethtool -C ethx rx-profile 1,1,n_2,n,n_3,3,n_4,4,n_n,5,n"n" means do not modify this field.$ ethtool -c ethx...rx-profile:{.usec = 1, .pkts = 1, .comps = n/a,},{.usec = 2, .pkts = 256, .comps = n/a,},{.usec = 3, .pkts = 3, .comps = n/a,},{.usec = 4, .pkts = 4, .comps = n/a,},{.usec = 256, .pkts = 5, .comps = n/a,}tx-profile: n/a3. HintIf the device does not support some type of customized dim profiles,the corresponding "n/a" will display.If the "n/a" field is being modified, -EOPNOTSUPP will be reported.Signed-off-by: Heng Qi Reviewed-by: Simon Horman Link: https://patch.msgid.link/20240621101353.107425-4-hengqi@linux.alibaba.comSigned-off-by: Jakub Kicinski List of files: /linux/net/Kconfig

9b6a30febddf4857cb4c367f5294bb6118340e30 - net: allow rps/rfs related configs to be switched

Wed, 05 Jun 2024 04:29:32 +0200

net: allow rps/rfs related configs to be switchedAfter John Sperbeck reported a compile error if the CONFIG_RFS_ACCELis off, I found that I cannot easily enable/disable the configbecause of lack of the prompt when using 'make menuconfig'. Therefore,I decided to change rps/rfc related configs altogether.Signed-off-by: Jason Xing Link: https://lore.kernel.org/r/20240605022932.33703-1-kerneljasonxing@gmail.comSigned-off-by: Paolo Abeni List of files: /linux/net/Kconfig

768cf8413883892c6ff0db783a0295a60886ec33 - net: add IEEE 802.1q specific helpers

Fri, 03 May 2024 15:13:42 +0200

net: add IEEE 802.1q specific helpersIEEE 802.1q specification provides recommendation and examples which canbe used as good default values for different drivers.This patch implements mapping examples documented in IEEE 802.1Q-2022 inAnnex I "I.3 Traffic type to traffic class mapping" and IETF DSCP namingand mapping DSCP to Traffic Type inspired by RFC8325.This helpers will be used in followup patches for dsa/microchip DCBimplementation.Signed-off-by: Oleksij Rempel Signed-off-by: David S. Miller List of files: /linux/net/Kconfig

9f06f87fef689d28588cde8c7ebb00a67da34026 - net: skbuff: generalize the skb->decrypted bit

Wed, 03 Apr 2024 22:21:39 +0200

net: skbuff: generalize the skb->decrypted bitThe ->decrypted bit can be reused for other crypto protocols.Remove the direct dependency on TLS, add helpers to clean upthe ifdefs leaking out everywhere.Signed-off-by: Jakub Kicinski Reviewed-by: David Ahern Signed-off-by: David S. Miller List of files: /linux/net/Kconfig

ea7f3cfaa58873bbe271577efa800647e30f18bd - net: bql: allow the config to be disabled

Thu, 15 Feb 2024 18:05:07 +0100

net: bql: allow the config to be disabledIt is impossible to disable BQL individually today, since there is noprompt for the Kconfig entry, so, the BQL is always enabled if SYSFS isenabled.Create a prompt entry for BQL, so, it could be enabled or disabled atbuild time independently of SYSFS.Signed-off-by: Breno Leitao Signed-off-by: David S. Miller List of files: /linux/net/Kconfig

98e20e5e13d2811898921f999288be7151a11954 - bpfilter: remove bpfilter

Tue, 26 Dec 2023 14:07:42 +0100

bpfilter: remove bpfilterbpfilter was supposed to convert iptables filtering rules intoBPF programs on the fly, from the kernel, through a usermodehelper. The base code for the UMH was introduced in 2018, andcouple of attempts (2, 3) tried to introduce the BPF programgenerate features but were abandoned.bpfilter now sits in a kernel tree unused and unusable, occasionallycausing confusion amongst Linux users (4, 5).As bpfilter is now developed in a dedicated repository on GitHub (6),it was suggested a couple of times this year (LSFMM/BPF 2023,LPC 2023) to remove the deprecated kernel part of the project. Thisis the purpose of this patch.[1]: https://lore.kernel.org/lkml/20180522022230.2492505-1-ast@kernel.org/[2]: https://lore.kernel.org/bpf/20210829183608.2297877-1-me@ubique.spb.ru/#t[3]: https://lore.kernel.org/lkml/20221224000402.476079-1-qde@naccy.de/[4]: https://dxuuu.xyz/bpfilter.html[5]: https://github.com/linuxkit/linuxkit/pull/3904[6]: https://github.com/facebook/bpfilterSigned-off-by: Quentin Deslandes Link: https://lore.kernel.org/r/20231226130745.465988-1-qde@naccy.deSigned-off-by: Alexei Starovoitov List of files: /linux/net/Kconfig

b3098d32ed6e6f4c03a95f14426143f1b0af620f - net: add skb_segment kunit test

Mon, 09 Oct 2023 16:41:51 +0200

net: add skb_segment kunit testAdd unit testing for skb segment. This function is exercised by manydifferent code paths, such as GSO_PARTIAL or GSO_BY_FRAGS, linear(with or without head_frag), frags or frag_list skbs, etc.It is infeasible to manually run tests that cover all code paths whenmaking changes. The long and complex function also makes it hard toestablish through analysis alone that a patch has no unintendedside-effects.Add code coverage through kunit regression testing. Introduce kunitinfrastructure for tests under net/core, and add this first test.This first skb_segment test exercises a simple case: a linear skb.Follow-on patches will parametrize the test and add more variants.Tested: Built and ran the test with make ARCH=um mrproper ./tools/testing/kunit/kunit.py run \ --kconfig_add CONFIG_NET=y \ --kconfig_add CONFIG_DEBUG_KERNEL=y \ --kconfig_add CONFIG_DEBUG_INFO=y \ --kconfig_add=CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y \ net_core_gsoSigned-off-by: Willem de Bruijn Reviewed-by: Florian Westphal Signed-off-by: David S. Miller List of files: /linux/net/Kconfig