Commit Graph

3157 Commits

Author SHA1 Message Date
Frank Li
b693b51e08 dt-bindings: net: dsa: Convert lan9303.txt to yaml format
Convert lan9303.txt to yaml format to fix below CHECK_DTBS warnings:
arch/arm/boot/dts/nxp/imx/imx53-kp-hsc.dtb: /soc/bus@50000000/i2c@53fec000/switch@a: failed to match any schema with compatible: ['smsc,lan9303-i2c']

Additional changes:
  - rename switch-phy to switch in example.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260610150533.515914-1-Frank.Li@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-13 15:00:07 -07:00
Jakub Kicinski
431662b642 Merge tag 'ipsec-next-2026-06-12' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next
Steffen Klassert says:

====================
pull request (net-next): ipsec-next 2026-06-12

1) Replace the open-coded manual cleanup in xfrm_add_policy() error
   path with xfrm_policy_destroy() for consistency with
   xfrm_policy_construct().
   From Deepanshu Kartikey.

2) Limit XFRMA_TFCPAD to a sensible maximum (max IP length, 64k) since
   u32 is excessive for traffic flow confidentiality padding.
   From David Ahern.

3) Add a new netlink message XFRM_MSG_MIGRATE_STATE that
   allows migrating individual IPsec SAs independently of
   their policies. The existing XFRM_MSG_MIGRATE is tightly coupled
   to policy+SA migration, lacks SPI for unique SA identification,
   and cannot express reqid changes or migrate Transport mode
   selectors. The new interface identifies the SA via SPI and mark,
   supports reqid changes, address family changes, encap removal,
   and uses an atomic create+install flow under x->lock to prevent
   SN/IV reuse during AEAD SA migration.
   From Antony Antony.

* tag 'ipsec-next-2026-06-12' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next:
  xfrm: add documentation for XFRM_MSG_MIGRATE_STATE
  xfrm: restrict netlink attributes for XFRM_MSG_MIGRATE_STATE
  xfrm: add XFRM_MSG_MIGRATE_STATE for single SA migration
  xfrm: make xfrm_dev_state_add xuo parameter const
  xfrm: extract address family and selector validation helpers
  xfrm: refactor XFRMA_MTIMER_THRESH validation into a helper
  xfrm: move encap and xuo into struct xfrm_migrate
  xfrm: add error messages to state migration
  xfrm: add state synchronization after migration
  xfrm: check family before comparing addresses in migrate
  xfrm: split xfrm_state_migrate into create and install functions
  xfrm: rename reqid in xfrm_migrate
  xfrm: fix NAT-related field inheritance in SA migration
  xfrm: allow migration from UDP encapsulated to non-encapsulated ESP
  xfrm: add extack to xfrm_init_state
  xfrm: remove redundant assignments
  xfrm: Reject excessive values for XFRMA_TFCPAD
  xfrm: cleanup error path in xfrm_add_policy()
====================

Link: https://patch.msgid.link/20260612074725.1760473-1-steffen.klassert@secunet.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-13 13:16:39 -07:00
Jakub Kicinski
96fbe161e4 docs: networking: add guidance on what to push via extack
Every now and then someone tries to duplicated extack
messages to dmesg. Document our guidance against this.
Also indicate that system level faults should continue
to go to system logs. The high level thinking is to try
to distinguish between what's important to the user vs
system admin.

Reviewed-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260611172149.1877704-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-12 17:55:48 -07:00
Sabrina Dubroca
cdae65fc43 tls: remove tls_toe and the related driver
The tls_toe feature and its single user (chelsio chtls) have been
unmaintained for multiple years. It also hooks into the core of the
TCP implementation, and bypasses most of the networking stack.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/1f30e73275c07bf879f547589872d0916025a52e.1781165969.git.sd@queasysnail.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-12 16:43:10 -07:00
Jakub Kicinski
6213cf54ad docs: net: fix minor issues with XDP metadata docs
Minor updates to the XDP metadata documentation:
- s/union/struct/ for xsk_tx_metadata
- document nested request and completion metadata fields
- point capability queries at the xsk-features attribute
- fix grammar in the XDP RX metadata guide
- typos

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Link: https://patch.msgid.link/20260609201224.1191391-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-12 15:58:02 -07:00
Matthieu Baerts (NGI0)
30ff28fdc4 mptcp: introduce add_addr_v6_port_drop_ts sysctl knob
This sysctl is going to be used in the next commits to drop TCP
timestamps option, to be able to send an ADD_ADDR with a v6 IP address
and a port number. It is enabled by default.

This knob is explicitly disabled in the MPTCP Join selftest, with the
"signal addr list progresses after tx drop" subtest, to continue
verifying the previous behaviour where the ADD_ADDR is not sent due to a
lack of space.

While at it, move syn_retrans_before_tcp_fallback down from struct
mptcp_pernet, to avoid creating another 3 bytes hole.

Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260605-net-next-mptcp-add-addr6-port-ts-v2-4-758e7ca73f4d@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-11 15:33:37 -07:00
Louis Scalbert
32b0b89533 bonding: 3ad: add lacp_strict configuration knob
When an 802.3ad (LACP) bonding interface has no slaves in the
collecting/distributing state, the bonding master still reports
carrier as up as long as at least 'min_links' slaves have carrier.

In this situation, only one slave is effectively used for TX/RX,
while traffic received on other slaves is dropped. Upper-layer
daemons therefore consider the interface operational, even though
traffic may be blackholed if the lack of LACP negotiation means
the partner is not ready to deal with traffic.

Introduce a configuration knob to control this behavior. It allows
the bonding master to assert carrier only when at least 'min_links'
slaves are in Collecting_Distributing state.

The default mode preserves the existing behavior. This patch only
introduces the knob; its behavior is implemented in the subsequent
commit.

Fixes: 655f8919d5 ("bonding: add min links parameter to 802.3ad")
Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
Acked-by: Jay Vosburgh <jv@jvosburgh.net>
Link: https://patch.msgid.link/20260603150331.1919611-4-louis.scalbert@6wind.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-10 07:53:26 -07:00
Jakub Kicinski
b5125db8d0 docs: net: ethtool: document ops-locked drivers and op_needs_rtnl
Catch up various bits of documentation after the locking changes.

Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20260605002912.3456868-13-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-09 10:13:06 -07:00
Julian Anastasov
4a15044a2b ipvs: add conn_max sysctl to limit connections
Currently, we are using atomic_t to track the number of
connections. On 64-bit setups with large memory there is
a risk this counter to overflow. Also, setups with many
containers may need to tune the limit for connections.

Add sysctl control to limit the number of connections to
1,073,741,824 (64-bit) and 16,777,216 (32-bit).
Depending on the admin's privilege, the value is
used to change a soft or hard limit allowing
unprivileged admins to change the soft limit in
range determined by privileged admins.

Link: https://sashiko.dev/#/patchset/20260523172715.94795-1-ja%40ssi.bg
Link: https://sashiko.dev/#/patchset/20260430074420.26697-7-ja%40ssi.bg
Link: https://sashiko.dev/#/patchset/20260522105546.13732-1-ja%40ssi.bg
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2026-06-05 13:11:54 +02:00
Akash Sukhavasi
0fbbc19482 dt-bindings: net: dsa: remove obsolete dsa.txt
dsa.txt has been a redirect to dsa.yaml since commit bce58590d1
("dt-bindings: net: dsa: Add DSA yaml binding") introduced the .yaml
schema. The .yaml has the same filename in the same directory, making
this redirect unnecessary for discoverability.

Two files still reference dsa.txt, forcing readers through an extra
hop to reach the .yaml. The stub has not been touched since August
2020. Update references in lan9303.txt and
Documentation/networking/dsa/dsa.rst to point directly to dsa.yaml
and remove the stub.

Signed-off-by: Akash Sukhavasi <akash.sukhavasi@gmail.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260603-b4-remove-redirect-stubs-v2-3-c8c19876ab64@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-04 18:17:15 -07:00
Jakub Kicinski
b8dfa196cb net: document NETDEV_CHANGENAME as ops locked
NETDEV_CHANGENAME is only emitted from netif_change_name().
netif_change_name() has two callers both of which hold netdev_lock_ops()
around the call site:
 - dev_change_name()
 - do_setlink()

Document NETDEV_CHANGENAME as always ops locked.

Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260603012840.2254293-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-04 14:04:55 -07:00
Antony Antony
c13c0cc6f5 xfrm: add documentation for XFRM_MSG_MIGRATE_STATE
Add documentation for the new XFRM_MSG_MIGRATE_STATE netlink message,
which migrates a single SA identified by SPI and mark without involving
policies.

The document covers the motivation and design differences from the
existing XFRM_MSG_MIGRATE, the SA lookup mechanism, supported attributes
with their omit-to-inherit semantics, and usage examples.

Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2026-06-04 12:22:50 +02:00
Costa Shulyupin
7745f1978a net: Remove orphaned ax25_ptr references
The AX.25 subsystem was removed in commit dd8d4bc28a
("net: remove ax25 and amateur radio (hamradio) subsystem"),
which removed the ax25_ptr field from struct net_device but
left behind the kdoc comment and documentation.

Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20260531134837.4111349-1-costa.shul@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-01 16:57:11 -07:00
Jakub Kicinski
ac0056e4f1 docs: page_pool: drop the mention of the legacy stats API
The Netlink support for querying page pool stats has been
proven out in production, let's remove the mention of the
helper meant for dumping page pool stats into ethtool -S
from the docs.

Call out in the kdoc that this API is deprecated.
Some drivers may not be able to use the Netlink API
(if page pool is shared across netdevs). So the old API
is not _completely_ dead. But we shouldn't advertise it.

Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260526155722.2790742-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 18:10:03 -07:00
Jakub Kicinski
bbf2313cbe docs: clarify page pool NAPI consumer requirement
The comment about requirements when to set the NAPI pointer
may not be super clear. Add more words.

Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260526155722.2790742-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 18:10:03 -07:00
Jakub Kicinski
63c4530050 docs: net: page_pool: drop reference to removed PP_FLAG_PAGE_FRAG
The flag was removed in commit 09d96ee567 ("page_pool: remove
PP_FLAG_PAGE_FRAG"), but the documentation still mentions it when
describing fragment usage. Drop the stale reference; the fragment
API does not require any opt-in flag.

Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260526155722.2790742-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 18:10:03 -07:00
Jakub Kicinski
1255733f2f docs: net: fix minor issues with segmentation offloads
Update the segmentation offload documentation to match current GSO types:

- clarify csum_start for encapsulated TSO
- document TCP AccECN GSO and NETIF_F_GSO_ACCECN
- distinguish legacy UFO from UDP L4 GSO
- add ESP and fraglist GSO entries

Link: https://patch.msgid.link/20260526160151.2793354-11-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:47 -07:00
Jakub Kicinski
25bfb3a8ed docs: net: render the checksum comment in checksum-offloads.rst
checksum-offloads.rst seems like a better place to render
the checksum comment than skbuff.rst.

Remove the stale references to sections in that comment
(it no longer has A, B, C, D, E sections).

Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260526160151.2793354-10-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:47 -07:00
Jakub Kicinski
6686e7f03f docs: net: add Rx notes to the checksum guide
The Rx checksum processing gives people pause. The two main questions
in my experience are:
 - what to do with bad IPv4 checksum; and
 - what to do with packets with bad checksum.

Folks often feel the urge to drop the latter, to "avoid overloading
the host".

Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260526160151.2793354-9-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:47 -07:00
Jakub Kicinski
f94874c388 docs: net: fix minor issues with checksum offloads
Update the checksum offload documentation to match current code:

- SCTP CRC32c offload requires NETIF_F_SCTP_CRC, not ordinary IP
  checksum offload
- NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM are restricted legacy
  features; new devices should use NETIF_F_HW_CSUM
- GRE LCO is handled by the shared gre_build_header() helper used by
  both IPv4 and IPv6 GRE
- VXLAN_F_REMCSUM_TX is a VXLAN configuration flag, not a field of
  struct vxlan_rdst

Link: https://patch.msgid.link/20260526160151.2793354-8-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:47 -07:00
Jakub Kicinski
f7d7d7e2a5 docs: net: refresh netdev feature guidance
Update netdev feature documentation for current locking rules and
feature semantics. Clarify hw_features updates and netdev_update_features()
locking, keep the NETIF_F_NEVER_CHANGE rule with the VLAN challenged
exception, fix the HSR duplication wording, and document netdev->netmem_tx
as a device flag rather than a feature bit.

Split the list of basic feature sets from the "extra" ones like
vlan_features. A bunch of the newer fields weren't documented and
having them all together would be confusing.

Link: https://patch.msgid.link/20260526160151.2793354-7-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:47 -07:00
Jakub Kicinski
33cd2d395c docs: net: fix minor issues with the NAPI guide
Update the NAPI documentation to match current API behavior:

- repeated napi_disable() calls hang waiting for ownership, rather
  than deadlock
- NAPI IDs are exposed through SO_INCOMING_NAPI_ID and netdev Netlink
- epoll uses the maxevents parameter spelling
- add that drivers holding the netdev instance lock may need _locked()
  variants

Link: https://patch.msgid.link/20260526160151.2793354-6-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:46 -07:00
Jakub Kicinski
427837e5fd docs: net: update devmem code examples
Update the code examples
 - update the YNL sample with the latest(?) APIs
 - struct dmabuf_tx_cmsg does not exist, use __u32 directly

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260526160151.2793354-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:46 -07:00
Jakub Kicinski
73ac86c584 docs: net: statistics: fix kernel-internal stats list
Update the kernel-internal ethtool stats list to match current code:

- spell the entries as "struct ethtool_*_stats", not as functions
- list the full set of structures, not only pause and fec
- mention that fields are pre-initialized to ETHTOOL_STAT_NOT_SET by
  ethtool_stats_init() and drivers should leave unsupported fields at
  that value rather than zeroing them

Link: https://patch.msgid.link/20260526160151.2793354-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:46 -07:00
Jakub Kicinski
c801a20779 docs: net: fix minor issues with driver guide
Update the driver documentation TX queue example to match current APIs:

- use the ring-local tx_ring_mask field in drv_tx_avail()
- stop the selected netdev_queue with netif_tx_stop_queue() instead of
  stopping queue 0 with netif_stop_queue()

Link: https://patch.msgid.link/20260526160151.2793354-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:46 -07:00
Jakub Kicinski
ea50122e45 docs: net: netdevices: small fixes and clarifications
A handful of unrelated nits:

 - free_netdevice() does not exist; replace two stray references
   with free_netdev().
 - The simple-driver probe example fell through into err_undo after
   register_netdev() success; add return 0 for clarity.
 - Clarify the netdev_priv() paragraph: "(netdev_priv())" was easy
   to misread as the thing that needs explicit freeing; spell out
   that it refers to extra pointers stored in the device private
   struct.
 - ndo_setup_tc synchronization note: TC_SETUP_BLOCK / TC_SETUP_FT
   actually run under block->cb_lock, not "NFT locks", and rtnl_lock
   may or may not be held depending on path.
 - ->lltx guidance reads as very outdated, it's not really deprecated.
   I suspect people may have been trying to use it for HW drivers
   in the past but I can't think of such a case in the last decade.

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260526160151.2793354-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-28 14:37:46 -07:00
Ethan Nelson-Moore
19d554d329 docs: net: arcnet: remove outdated/irrelevant information; improve style
The ARCnet documentation contains a lot of outdated and irrelevant
information (such as changes in decades-old driver versions and
messages from a former maintainer) and has some writing style issues.
Remove this unnecessary information and improve the writing style. Also
remove links to pages that no longer exist.

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Link: https://patch.msgid.link/20260521001631.45434-7-enelsonmoore@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-22 17:20:57 -07:00
Ethan Nelson-Moore
910394c74c net: arcnet: remove ISA and PCMCIA support; modernize documentation
While ARCnet is still used in industrial environments, and cards are
still manufactured, it is unlikely anyone is still using it with ISA
and PCMCIA cards. Reduce future maintenance burden by removing all ISA
and PCMCIA ARCnet drivers and documentation related to them. Update
instructions for loading modules and passing parameters to work on
modern kernels and with the com20020_pci driver. Also take the
opportunity to document the rest of the module parameters, correct a
file path in Documentation/networking/arcnet.rst, and change a
reference to /etc/rc.inet1, which no longer exists, to refer to
ifconfig.

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Link: https://patch.msgid.link/20260521001631.45434-4-enelsonmoore@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-22 17:20:56 -07:00
Jakub Kicinski
6a20b34fe3 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Cross-merge networking fixes after downstream PR (net-7.1-rc5).

No conflicts, adjacent changes:

drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
  cc199cd1b9 ("net/mlx5e: Reduce branches in napi poll")
  c326f9c689 ("net/mlx5e: xsk: Fix unlocked writing to ICOSQ")

drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
  c6df9a65cb ("net/mlx5: Skip disabled vports when setting max TX speed")
  1fba57c914 ("net/mlx5: Add VHCA_ID page management mode support")

net/mac80211/mlme.c
  a6e6ccd5bd ("wifi: mac80211: consume only present negotiated TTLM maps")
  49e62ec6eb ("wifi: mac80211: move frame RX handling to type files")

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-21 15:09:02 -07:00
Maciej W. Rozycki
75756cb4b2 ethernet: 3c509: Update documentation to match MAINTAINERS
There has been apparently a single message only ever publicly posted by
David Ruggiero, back in 2002, which added this documentation piece among
others, and MAINTAINERS was never updated accordingly.  It is therefore
doubtful that his maintainer status has actually come into effect.  Just
replace the reference then so as not to confuse people.

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Link: https://patch.msgid.link/alpine.DEB.2.21.2605201207380.1450@angie.orcam.me.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-21 08:28:56 -07:00
Maciej W. Rozycki
28db0338db Revert "drivers: net: 3com: 3c509: Remove this driver"
This reverts commit 91f3a27ae9.

Contrary to the assumption stated with the original commit description
this driver is in use and I'm going to maintain it for the foreseeable
future.

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Link: https://patch.msgid.link/alpine.DEB.2.21.2605201204260.1450@angie.orcam.me.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-21 08:28:56 -07:00
Bobby Eshleman
6ce2bb0480 net: netkit: declare NETMEM_TX_NO_DMA mode
Some virtual devices like netkit (or ifb) never DMA and never touch frag
contents, they just forward the skb to another device. They are unable
to forward unreadable skbs, however, because they fail to pass TX
validation checks on dev->netmem_tx. The existing two-state
NETMEM_TX_NONE / NETMEM_TX_DMA doesn't give the TX validator enough
information to differentiate devices that will attempt DMA on the
unreadable skb from those that will simply route it untouched.

Add a third mode to the enum so drivers can indicate 1) if they have
netmem TX support, and 2) if they do, whether they are DMA-capable:

NETMEM_TX_NO_DMA - pass-through, device never DMAs

Widen dev->netmem_tx from a 1-bit field to 2 bits to fit the new value,
and declare netkit as NETMEM_TX_NO_DMA. Devmem TX support over these
devices comes in a follow-up patch.

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-2-408c59b91e66@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-18 18:49:06 -07:00
Bobby Eshleman
7d3ab852dc net: convert netmem_tx flag to enum
Devices that support netmem TX previously set dev->netmem_tx = true.
This was checked in validate_xmit_unreadable_skb() to drop unreadable
skbs (skbs with dmabuf-backed frags) before they reach drivers that
would mishandle them or devices that would not have the iommu mappings
for them.

A subsequent patch will introduce a third state for virtual devices
that forward unreadable skbs without ever performing DMA on them. To
prepare for that, convert the boolean dev->netmem_tx into an enum:

NETMEM_TX_NONE   - no netmem TX support (drop unreadable skbs)
NETMEM_TX_DMA    - full support, device does DMA

Update the existing NIC drivers (bnxt, gve, mlx5, fbnic) and the
validators in net/core to use the new enum. No functional change.

Acked-by: Harshitha Ramamurthy <hramamurthy@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-1-408c59b91e66@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-18 18:49:06 -07:00
Avinash Duduskar
e54fe8200a Documentation: networking: devlink: stmmac: fix typo in phc_coarse_adj
"Functionnal" should be "Functional".

Signed-off-by: Avinash Duduskar <avinash.duduskar@gmail.com>
Link: https://patch.msgid.link/20260512133214.1773502-1-avinash.duduskar@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-14 17:12:40 -07:00
Avinash Duduskar
d2dc0c5c4c Documentation: networking: ip-sysctl: fix typo in tcp_ecn_option
"regarless" should be "regardless".

Signed-off-by: Avinash Duduskar <avinash.duduskar@gmail.com>
Link: https://patch.msgid.link/20260512133125.1772658-1-avinash.duduskar@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-14 17:12:35 -07:00
Eric Biggers
34d67417c8 Documentation/tcp_ao: Document the supported MAC algorithms and lengths
Update the TCP-AO documentation to fix some incorrect terminology and
claims regarding the MAC algorithms, and document which MAC algorithms
and lengths the Linux implementation supports.

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Link: https://patch.msgid.link/20260429210856.725667-1-ebiggers@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-02 10:18:09 -07:00
Eric Dumazet
dd033ec406 tcp: move tp->bytes_acked to tcp_sock_write_tx group
tp->bytes_acked is touched in TX path only.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260430100021.211139-5-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-01 17:22:45 -07:00
Eric Dumazet
2b28dd212a tcp: move tp->segs_in and tp->segs_out to tcp_sock_write_txrx group
segs_in is changed for each incoming packet, including ACK packets.
segs_out is changed for each outgoing packet, including ACK packets.

They belong to tcp_sock_write_txrx group.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260430100021.211139-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-01 17:22:45 -07:00
Eric Dumazet
9f810527a3 tcp: move tp->delivered and tp->delivered_ce to tcp_sock_write_tx group
These counters are changed whenever sent data is acknowleged.

They do not belong to tcp_sock_write_txrx group, because TCP receivers
do not touch them.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260430100021.211139-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-01 17:22:44 -07:00
Arnd Bergmann
93cda0c120 net: cs89x0: remove ISA bus probing
The cs89x0 driver is really two in one, and they are mutually exclusive:

 - the ISA driver was used on 486-era PCs. It likely has no remaining
   users, like the other ethernet drivers that got removed in
   linux-7.1. The DMA support in here is the last device driver use of
   the deprecated isa_bus_to_virt() interface, all other users are either
   x86 specific or or got converted to the normal dma-mapping interface.
   The driver was maintained by Andrew Morton at the time, based on
   the linux-2.2 vendor driver from Cirrus Logic.

 - the platform_driver instance was used on some embedded Arm boards
   around the same time, such as the EP7211 Development Kit. This
   is the same chip, but uses modern devicetree based probing and no DMA.
   This was added by Alexander Shiyan.

Remove the ISA driver as a cleanup, including all of the outdated
documentation referring to its configuration.

Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260429145624.2948432-1-arnd@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-05-01 16:46:53 -07:00
Mahanta Jambigi
790ead9394 Documentation: net/smc: correct old value of smcr_max_recv_wr
The smc-sysctl.rst documentation incorrectly stated that
the previous hardcoded maximum number of WR buffers on
the receive path (smcr_max_recv_wr) was 16.
The correct historical value used before the introduction of
the sysctl control was 48. Update the documentation to reflect
the accurate historical value. Also fix a couple of minor typos.

Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Sidraya Jayagond <sidraya@linux.ibm.com>
Signed-off-by: Mahanta Jambigi <mjambigi@linux.ibm.com>
Link: https://patch.msgid.link/20260424052336.3262350-1-mjambigi@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-04-27 16:49:39 -07:00
Linus Torvalds
64edfa6506 Merge tag 'net-deletions' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
Pull networking deletions from Jakub Kicinski:
 "Delete some obsolete networking code

  Old code like amateur radio and NFC have long been a burden to core
  networking developers. syzbot loves to find bugs in BKL-era code, and
  noobs try to fix them.

  If we want to have a fighting chance of surviving the LLM-pocalypse
  this code needs to find a dedicated owner or get deleted. We've talked
  about these deletions multiple times in the past and every time
  someone wanted the code to stay. It is never very clear to me how many
  of those people actually use the code vs are just nostalgic to see it
  go. Amateur radio did have occasional users (or so I think) but most
  users switched to user space implementations since its all super slow
  stuff. Nobody stepped up to maintain the kernel code.

  We were lucky enough to find someone who wants to help with NFC so
  we're giving that a chance. Let's try to put the rest of this code
  behind us"

* tag 'net-deletions' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next:
  drivers: net: 8390: wd80x3: Remove this driver
  drivers: net: 8390: ultra: Remove this driver
  drivers: net: 8390: AX88190: Remove this driver
  drivers: net: fujitsu: fmvj18x: Remove this driver
  drivers: net: smsc: smc91c92: Remove this driver
  drivers: net: smsc: smc9194: Remove this driver
  drivers: net: amd: nmclan: Remove this driver
  drivers: net: amd: lance: Remove this driver
  drivers: net: 3com: 3c589: Remove this driver
  drivers: net: 3com: 3c574: Remove this driver
  drivers: net: 3com: 3c515: Remove this driver
  drivers: net: 3com: 3c509: Remove this driver
  net: packetengines: remove obsolete yellowfin driver and vendor dir
  net: packetengines: remove obsolete hamachi driver
  net: remove unused ATM protocols and legacy ATM device drivers
  net: remove ax25 and amateur radio (hamradio) subsystem
  net: remove ISDN subsystem and Bluetooth CMTP
  caif: remove CAIF NETWORK LAYER
2026-04-24 09:41:58 -07:00
Andrew Lunn
a3fb9a5bf6 drivers: net: smsc: smc91c92: Remove this driver
The smc91c92 was written by David A Hinds in 1999. It is an PCMCIA
device, so unlikely to be used with modern kernels.

Remove the Documentation as well, since it refers to kernel versions
1.2.13 until 1.3.71 and FTP sites which no longer exist.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260422-v7-0-0-net-next-driver-removal-v1-v2-8-08a5b59784d5@lunn.ch
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-04-23 15:57:06 -07:00
Andrew Lunn
91f3a27ae9 drivers: net: 3com: 3c509: Remove this driver
The 3c509 was written by Donald Becker between 1993-2000. It is an ISA
device, so unlikely to be used with modern kernels.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260422-v7-0-0-net-next-driver-removal-v1-v2-1-08a5b59784d5@lunn.ch
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-04-23 15:56:43 -07:00
Jakub Kicinski
6deb535950 net: remove unused ATM protocols and legacy ATM device drivers
Remove the ATM protocol modules and PCI/SBUS ATM device drivers
that are no longer in active use.

The ATM core protocol stack, PPPoATM, BR2684, and USB DSL modem
drivers (drivers/usb/atm/) are retained in-tree to maintain PPP
over ATM (PPPoA) and PPPoE-over-BR2684 support for DSL connections.
The Solos ADSL2+ PCI driver is also retained.

Removed ATM protocol modules:
 - net/atm/clip.c - Classical IP over ATM (RFC 2225)
 - net/atm/lec.c - LAN Emulation Client (LANE)
 - net/atm/mpc.c, mpoa_caches.c, mpoa_proc.c - Multi-Protocol Over ATM

Removed PCI/SBUS ATM device drivers (drivers/atm/):
 - adummy, atmtcp - software/testing ATM devices
 - eni - Efficient Networks ENI155P (OC-3, ~1995)
 - fore200e - FORE Systems 200E PCI/SBUS (OC-3, ~1999)
 - he - ForeRunner HE (OC-3/OC-12, ~2000)
 - idt77105 - IDT 77105 25 Mbps ATM PHY
 - idt77252 - IDT 77252 NICStAR II (OC-3, ~2000)
 - iphase - Interphase ATM PCI (OC-3/DS3/E3)
 - lanai - Efficient Networks Speedstream 3010
 - nicstar - IDT 77201 NICStAR (155/25 Mbps, ~1999)
 - suni - PMC S/UNI SONET PHY library

Also clean up references in:
 - net/bridge/ - remove ATM LANE hook (br_fdb_test_addr_hook,
   br_fdb_test_addr)
 - net/core/dev.c - remove br_fdb_test_addr_hook export
 - defconfig files - remove ATM driver config options

The removed code is moved to an out-of-tree module package (mod-orphan).

Acked-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20260422041846.2035118-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-04-23 12:21:14 -07:00
Jakub Kicinski
dd8d4bc28a net: remove ax25 and amateur radio (hamradio) subsystem
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 <kuba@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Carlos Bilbao <carlos.bilbao@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://patch.msgid.link/20260421021824.1293976-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2026-04-23 10:24:02 -07:00
Jakub Kicinski
6d5431555d caif: remove CAIF NETWORK LAYER
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:
  a8c7687bf2 ("caif_virtio: Check that vringh_config is not null")
  b2273be8d2 ("caif_virtio: Use vringh_notify_enable correctly")
  0d2e1a2926 ("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, ca75bcf0a8).

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 <mst@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260416182829.1440262-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-04-23 10:23:44 -07:00
Stanislav Fomichev
7ef83bf171 net: move promiscuity handling into netdev_rx_mode_work
Move unicast promiscuity tracking into netdev_rx_mode_work so it runs
under netdev_ops_lock instead of under the addr_lock spinlock. This
is required because __dev_set_promiscuity calls dev_change_rx_flags
and __dev_notify_flags, both of which may need to sleep.

Change ASSERT_RTNL() to netdev_ops_assert_locked() in
__dev_set_promiscuity, netif_set_allmulti and __dev_change_flags
since these are now called from the work queue under the ops lock.

Link: https://lore.kernel.org/netdev/20260214033859.43857-1-jiayuan.chen@linux.dev/
Fixes: 78cd408356 ("net: add missing instance lock to dev_set_promiscuity")
Reported-by: syzbot+2b3391f44313b3983e91@syzkaller.appspotmail.com
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260416185712.2155425-5-sdf@fomichev.me
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2026-04-21 12:50:24 +02:00
Stanislav Fomichev
3554b4345d net: introduce ndo_set_rx_mode_async and netdev_rx_mode_work
Add ndo_set_rx_mode_async callback that drivers can implement instead
of the legacy ndo_set_rx_mode. The legacy callback runs under the
netif_addr_lock spinlock with BHs disabled, preventing drivers from
sleeping. The async variant runs from a work queue with rtnl_lock and
netdev_lock_ops held, in fully sleepable context.

When __dev_set_rx_mode() sees ndo_set_rx_mode_async, it schedules
netdev_rx_mode_work instead of calling the driver inline. The work
function takes two snapshots of each address list (uc/mc) under
the addr_lock, then drops the lock and calls the driver with the
work copies. After the driver returns, it reconciles the snapshots
back to the real lists under the lock.

Add netif_rx_mode_sync() to opportunistically execute the pending
workqueue update inline, so that rx mode changes are committed
before returning to userspace:
  - dev_change_flags (SIOCSIFFLAGS / RTM_NEWLINK)
  - dev_set_promiscuity
  - dev_set_allmulti
  - dev_ifsioc SIOCADDMULTI / SIOCDELMULTI
  - do_setlink (RTM_SETLINK)

Note that some deep hierarchies still do skip the lower updates via:
  - dev_uc_sync
  - dev_mc_sync

If we do end up hitting user-visible issues, we can add more calls to
netif_rx_mode_sync in specific places. But hopefully we should not,
the actual user-visible lists are still synced, it's that just HW state
that might be lagging.

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260416185712.2155425-3-sdf@fomichev.me
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2026-04-21 12:50:03 +02:00
Jakub Kicinski
03a1569c2b Merge tag 'nf-next-26-04-10' of https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next
Florian Westphal says:

====================
netfilter: updates for net-next

1-3) IPVS updates from Julian Anastasov to enhance visibility into
     IPVS internal state by exposing hash size, load factor etc and
     allows userspace to tune the load factor used for resizing hash
     tables.

4) reject empty/not nul terminated device names from xt_physdev.
   This isn't a bug fix; existing code doesn't require a c-string.
   But clean this up anyway because conceptually the interface name
   definitely should be a c-string.

5) Switch nfnetlink to skb_mac_header helpers that didn't exist back
   when this code was written.  This gives us additional debug checks
   but is not intended to change functionality.

6) Let the xt ttl/hoplimit match reject unknown operator modes.
   This is a cleanup, the evaluation function simply returns false when
   the mode is out of range.  From Marino Dzalto.

7) xt_socket match should enable defrag after all other checks. This
   bug is harmless, historically defrag could not be disabled either
   except by rmmod.

8) remove UDP-Lite conntrack support, from Fernando Fernandez Mancera.

9) Avoid a couple -Wflex-array-member-not-at-end warnings in the old
   xtables 32bit compat code, from Gustavo A. R. Silva.

10) nftables fwd expression should drop packets when their ttl/hl has
    expired.  This is a bug fix deferred, its not deemed important
    enough for -rc8.
11) Add additional checks before assuming the mac header is an ethernet
    header, from Zhengchuan Liang.

* tag 'nf-next-26-04-10' of https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf-next:
  netfilter: require Ethernet MAC header before using eth_hdr()
  netfilter: nft_fwd_netdev: check ttl/hl before forwarding
  netfilter: x_tables: Avoid a couple -Wflex-array-member-not-at-end warnings
  netfilter: conntrack: remove UDP-Lite conntrack support
  netfilter: xt_socket: enable defrag after all other checks
  netfilter: xt_HL: add pr_fmt and checkentry validation
  netfilter: nfnetlink: prefer skb_mac_header helpers
  netfilter: x_physdev: reject empty or not-nul terminated device names
  ipvs: add conn_lfactor and svc_lfactor sysctl vars
  ipvs: add ip_vs_status info
  ipvs: show the current conn_tab size to users
====================

Link: https://patch.msgid.link/20260410112352.23599-1-fw@strlen.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-04-12 09:39:21 -07:00