kernel/linux.git/drivers/net/Kconfig, branch master

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

ipv6: convert CONFIG_IPV6 to built-in only and clean up Kconfigs

2026-03-29T18:21:22+00:00

Maintaining a modular IPv6 stack offers image size savings for specific setups, this benefit is outweighed by the architectural burden it imposes on the subsystems on implementation and maintenance. Therefore, drop it. Change CONFIG_IPV6 from tristate to bool. Remove all Kconfig dependencies across the tree that explicitly checked for IPV6=m. In addition, remove MODULE_DESCRIPTION(), MODULE_ALIAS(), MODULE_AUTHOR() and MODULE_LICENSE(). This is also replacing module_init() by device_initcall(). It is not possible to use fs_initcall() as IPv4 does because that creates a race condition on IPv6 addrconf. Finally, modify the default configs from CONFIG_IPV6=m to CONFIG_IPV6=y except for m68k as according to the bloat-o-meter the image is increasing by 330KB~ and that isn't acceptable. Instead, disable IPv6 on this architecture by default. This is aligned with m68k RAM requirements and recommendations [1]. [1] http://www.linux-m68k.org/faq/ram.html Signed-off-by: Fernando Fernandez Mancera Tested-by: Ricardo B. Marlière Acked-by: Krzysztof Kozlowski # arm64 Link: https://patch.msgid.link/20260325120928.15848-2-fmancera@suse.de Signed-off-by: Jakub Kicinski

virtio_net: add page_pool support for buffer allocation

2026-03-17T02:19:39+00:00

Use page_pool for RX buffer allocation in mergeable and small buffer modes to enable page recycling and avoid repeated page allocator calls. skb_mark_for_recycle() enables page reuse in the network stack. Big packets mode is unchanged because it uses page->private for linked list chaining of multiple pages per buffer, which conflicts with page_pool's internal use of page->private. Implement conditional DMA premapping using virtqueue_dma_dev(): - When non-NULL (vhost, virtio-pci): use PP_FLAG_DMA_MAP with page_pool handling DMA mapping, submit via virtqueue_add_inbuf_premapped() - When NULL (VDUSE, direct physical): page_pool handles allocation only, submit via virtqueue_add_inbuf_ctx() This preserves the DMA premapping optimization from commit 31f3cd4e5756b ("virtio-net: rq submits premapped per-buffer") while adding page_pool support as a prerequisite for future zero-copy features (devmem TCP, io_uring ZCRX). Page pools are created in probe and destroyed in remove (not open/close), following existing driver behavior where RX buffers remain in virtqueues across interface state changes. Signed-off-by: Vishwanath Seshagiri Acked-by: Jason Wang Acked-by: Michael S. Tsirkin Link: https://patch.msgid.link/20260310183107.2822016-1-vishs@meta.com Signed-off-by: Jakub Kicinski

printk: add CONFIG_PRINTK dependency for netconsole

2026-02-17T12:04:20+00:00

The 'select PRINTK_EXECUTION_CTX' line now causes a harmless warning when NETCONSOLE_DYNAMIC is enabled but PRINTK is not: WARNING: unmet direct dependencies detected for PRINTK_EXECUTION_CTX Depends on [n]: PRINTK [=n] Selected by [y]: - NETCONSOLE_DYNAMIC [=y] && NETDEVICES [=y] && NET_CORE [=y] && NETCONSOLE [=y] && SYSFS [=y] && CONFIGFS_FS [=y] && (NETCONSOLE [=y]!=y [=y] || CONFIGFS_FS [=y]!=m [=m]) In that configuration, the netconsole driver is useless anyway, so avoid this with an added dependency that prevents CONFIG_NETCONSOLE to be enabled without CONFIG_PRINTK. Fixes: 60325c27d3cf ("printk: Add execution context (task name/CPU) to printk_info") Signed-off-by: Arnd Bergmann Reviewed-by: Simon Horman Link: https://patch.msgid.link/20260213074431.1729627-1-arnd@kernel.org Signed-off-by: Paolo Abeni

printk: Add execution context (task name/CPU) to printk_info

2026-02-11T03:51:56+00:00

Extend struct printk_info to include the task name, pid, and CPU number where printk messages originate. This information is captured at vprintk_store() time and propagated through printk_message to nbcon_write_context, making it available to nbcon console drivers. This is useful for consoles like netconsole that want to include execution context in their output, allowing correlation of messages with specific tasks and CPUs regardless of where the console driver actually runs. The feature is controlled by CONFIG_PRINTK_EXECUTION_CTX, which is automatically selected by CONFIG_NETCONSOLE_DYNAMIC. When disabled, the helper functions compile to no-ops with no overhead. Suggested-by: John Ogness Signed-off-by: Petr Mladek Reviewed-by: Petr Mladek Signed-off-by: Breno Leitao Reviewed-by: John Ogness Link: https://patch.msgid.link/20260206-nbcon-v7-1-62bda69b1b41@debian.org Signed-off-by: Jakub Kicinski

net: remove HIPPI support and RoadRunner HIPPI driver

2026-01-21T03:12:06+00:00

HIPPI has not been relevant for over two decades. It was rapidly eclipsed by Fibre Channel, and even when it was new, it was confined to very high-end hardware. The HIPPI code has only received tree-wide changes and fixes by inspection in the entire Git history. Remove HIPPI support and the rrunner HIPPI driver, and move the former maintainer to the CREDITS file. Keep the include/uapi/linux/if_hippi.h header because it is used by the TUN code, and to avoid breaking userspace, however unlikely that may be. Signed-off-by: Ethan Nelson-Moore Link: https://patch.msgid.link/20260119022451.22344-1-enelsonmoore@gmail.com Signed-off-by: Jakub Kicinski

wireguard: kconfig: simplify crypto kconfig selections

2025-09-08T16:44:08+00:00

Simplify the kconfig entry for WIREGUARD: - Drop the selections of the arch-optimized ChaCha20, Poly1305, BLAKE2s, and Curve25519 code. These options no longer exist, as lib/crypto/ now enables the arch-optimized code automatically. - Drop the selection of CRYPTO. This was needed only to make the arch-optimized options visible. lib/crypto/ now handles these options internally, without any dependency on CRYPTO. - Drop the dependency on !KMSAN. This was needed only to avoid selecting arch-optimized code that isn't compatible with KMSAN. lib/crypto/ now handles the !KMSAN dependencies internally. - Add a selection of CRYPTO_LIB_UTILS, since WireGuard directly calls crypto_memneq(). This gets selected indirectly by CRYPTO_LIB_CURVE25519 and CRYPTO_LIB_CHACHA20POLY1305 anyway, but it's best to make this dependency explicit. Link: https://lore.kernel.org/r/20250906213523.84915-13-ebiggers@kernel.org Signed-off-by: Eric Biggers

ovpn: implement TCP transport

2025-04-17T10:30:03+00:00

With this change ovpn is allowed to communicate to peers also via TCP. Parsing of incoming messages is implemented through the strparser API. Note that ovpn redefines sk_prot and sk_socket->ops for the TCP socket used to communicate with the peer. For this reason it needs to access inet6_stream_ops, which is declared as extern in the IPv6 module, but it is not fully exported. Therefore this patch is also adding EXPORT_SYMBOL_GPL(inet6_stream_ops) to net/ipv6/af_inet6.c. Cc: David Ahern Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Simon Horman Signed-off-by: Antonio Quartulli Link: https://patch.msgid.link/20250415-b4-ovpn-v26-11-577f6097b964@openvpn.net Reviewed-by: Sabrina Dubroca Tested-by: Oleksandr Natalenko Signed-off-by: Paolo Abeni

ovpn: implement packet processing

2025-04-17T10:30:02+00:00

This change implements encryption/decryption and encapsulation/decapsulation of OpenVPN packets. Support for generic crypto state is added along with a wrapper for the AEAD crypto kernel API. Signed-off-by: Antonio Quartulli Link: https://patch.msgid.link/20250415-b4-ovpn-v26-9-577f6097b964@openvpn.net Reviewed-by: Sabrina Dubroca Tested-by: Oleksandr Natalenko Signed-off-by: Paolo Abeni

ovpn: implement basic TX path (UDP)

2025-04-17T10:30:02+00:00

Packets sent over the ovpn interface are processed and transmitted to the connected peer, if any. Implementation is UDP only. TCP will be added by a later patch. Note: no crypto/encapsulation exists yet. Packets are just captured and sent. Signed-off-by: Antonio Quartulli Link: https://patch.msgid.link/20250415-b4-ovpn-v26-7-577f6097b964@openvpn.net Reviewed-by: Sabrina Dubroca Tested-by: Oleksandr Natalenko Signed-off-by: Paolo Abeni