Re: [PATCH net-deletions v2] net: remove unused ATM protocols and legacy ATM device drivers

[Simon Horman <horms@kernel.org>]

On Tue, Apr 21, 2026 at 09:18:44PM -0700, Jakub Kicinski wrote:
> 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.
> 
> 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)
>  - solos-pci - Traverse Technologies ADSL2+ PCI
>  - 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).
> 
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
> ---
> v2:
>  - keep BR2684
>  - correct the claim that Traverse Technologies is defunct,
>    I'm still deleting the solos driver, chances are nobody uses it.
>    Easy enough to revert back in since core is still around.
>    The guiding principle is to keep USB modems and delete
>    the rest as USB ADSL2+ CPEs were most popular historically.
> v1: https://lore.kernel.org/20260421021943.1295109-1-kuba@kernel.org

Reviewed-by: Simon Horman <horms@kernel.org>