linux-toradex.git/net/Kconfig, branch master

net: remove ax25 and amateur radio (hamradio) subsystem

2026-04-23T17:24:02+00:00

Remove the amateur radio (AX.25, NET/ROM, ROSE) protocol implementation
and 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 influx
of the AI-generated bug reports we need to move it out of tree
to protect our sanity.

The code is moved to an out-of-tree repo:
https://github.com/linux-netdev/mod-orphan
if 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 continues
to 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.org
Signed-off-by: Paolo Abeni

caif: remove CAIF NETWORK LAYER

2026-04-23T17:23:44+00:00

Remove CAIF (Communication CPU to Application CPU Interface), the
ST-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 officially
shut 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, and
the 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 were
3 reports on security@ about CAIF that I have been CCed on.

UAPI constants (AF_CAIF, ARPHRD_CAIF, N_CAIF, VIRTIO_ID_CAIF) and the
SELinux 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.org
Signed-off-by: Jakub Kicinski

net: Kconfig: discourage drop_monitor enablement

2025-10-17T23:29:26+00:00

Quoting 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 not
related to perf-based drop monitoring and that its safe to disable
this 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.de
Signed-off-by: Jakub Kicinski

dibs: Create drivers/dibs

2025-09-23T09:13:21+00:00

Create the file structure for a 'DIBS - Direct Internal Buffer Sharing'
shim layer that will provide generic functionality and declarations for
dibs 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.com
Signed-off-by: Paolo Abeni

psp: base PSP device support

2025-09-18T10:32:06+00:00

Add a netlink family for PSP and allow drivers to register support.

The "PSP device" is its own object. This allows us to perform more
flexible reference counting / lifetime control than if PSP information
was part of net_device. In the future we should also be able
to "delegate" PSP access to software devices, such as *vlan, veth
or 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.com
Signed-off-by: Paolo Abeni

net: Kconfig: add endif/endmenu comments

2025-07-23T01:17:23+00:00

Add comments on endif & endmenu blocks. This can save time
when 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 already
commented like this.

Signed-off-by: Randy Dunlap 
Reviewed-by: Simon Horman 
Link: https://patch.msgid.link/20250721020420.3555128-1-rdunlap@infradead.org
Signed-off-by: Jakub Kicinski

net: Kconfig NET_DEVMEM selects GENERIC_ALLOCATOR

2025-05-28T00:31:42+00:00

GENERIC_ALLOCATOR is a non-prompt kconfig, meaning users can't enable it
selectively. All kconfig users of GENERIC_ALLOCATOR select it, except of
NET_DEVMEM which only depends on it, there is no easy way to turn
GENERIC_ALLOCATOR on unless we select other unnecessary configs that
will 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.com
Signed-off-by: Jakub Kicinski

net: introduce CONFIG_NET_CRC32C

2025-05-21T22:39:58+00:00

Add a hidden kconfig symbol NET_CRC32C that will group together the
functions that calculate CRC32C checksums of packets, so that these
don'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 is
enabled) 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.org
Signed-off-by: Jakub Kicinski

net: Retire DCCP socket.

2025-04-12T01:58:10+00:00

DCCP was orphaned in 2021 by commit 054c4610bd05 ("MAINTAINERS: dccp:
move Gerrit Renker to CREDITS"), which noted that the last maintainer
had been inactive for five years.

In recent years, it has become a playground for syzbot, and most changes
to DCCP have been odd bug fixes triggered by syzbot. Apart from that,
the only changes have been driven by treewide or networking API updates
or adjustments related to TCP.

Thus, in 2023, we announced we would remove DCCP in 2025 via commit
b144fcaf46d4 ("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 hosted
on GitHub [1], and development is not taking place through the upstream
community. 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, upstream
the patches, and step up as a maintainer, but there has been no further
communication 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 allows
us to freely reorganize the layout of struct inet_connection_sock, which
is currently shared with DCCP, and optimize it to reduce the number of
cachelines 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.com
Signed-off-by: Jakub Kicinski

netlink: spec: add shaper YAML spec

2024-10-10T15:30:21+00:00

Define the user-space visible interface to query, configure and delete
network shapers via yaml definition.

Add dummy implementations for the relevant NL callbacks.

set() and delete() operations touch a single shaper creating/updating or
deleting it.
The group() operation creates a shaper's group, nesting multiple input
shapers under the specified output shaper.

Reviewed-by: Jiri Pirko 
Signed-off-by: Paolo Abeni 
Link: https://patch.msgid.link/7a33a1ff370bdbcd0cd3f909575c912cd56f41da.1728460186.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski