From a5148bc2fa27092862ac4b9e7b5c8340d60cff34 Mon Sep 17 00:00:00 2001 From: Alex Cheema Date: Wed, 29 Apr 2026 18:57:39 +0100 Subject: net: usb: cdc_ncm: add Apple Mac USB-C direct networking quirk Apple Silicon Macs expose two CDC NCM "private" data interfaces over USB-C with VID:PID 0x05ac:0x1905 and product string "Mac". This is the same protocol Apple already ships on iPhone (0x05ac:0x12a8) and iPad (0x05ac:0x12ab) for RemoteXPC since iOS 17 -- both data interfaces lack an interrupt status endpoint, so they rely on the FLAG_LINK_INTR- conditional bind path introduced in commit 3ec8d7572a69 ("CDC-NCM: add support for Apple's private interface"). The id_table currently has entries for iPhone and iPad but not for the Mac. Without a match, cdc_ncm falls through to the generic CDC NCM class-match entry, which uses the FLAG_LINK_INTR-having cdc_ncm_info struct, so bind_common() fails on the missing status endpoint and no netdev appears. Add id_table entries for both interface numbers (0 and 2) of the Mac, bound to the existing apple_private_interface_info driver_info. Verified empirically on a Mac Studio M3 Ultra running macOS 26.5: when a Mac is connected via USB-C, ioreg shows VID 0x05ac, PID 0x1905, product string "Mac", with two NCM data interfaces at numbers 0 and 2. The same PID is presented by all current Apple Silicon Mac models (MacBook Pro/Air, Mac mini, Mac Studio across the M-series), mirroring Apple's single-PID-per-family pattern from iPhone/iPad. After this patch, plugging a Mac into a Linux host running the patched kernel produces two enx... interfaces (one per data interface), "ip -br link" lists them as UP, and standard userspace networking (DHCP, NetworkManager shared mode, etc.) works without any modprobe overrides or out-of-tree modules. Signed-off-by: Alex Cheema Reviewed-by: Simon Horman Link: https://patch.msgid.link/20260429175739.34426-1-alex@exolabs.net Signed-off-by: Jakub Kicinski --- drivers/net/usb/cdc_ncm.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index bb9929727eb9..0223a172851e 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -2012,6 +2012,14 @@ static const struct usb_device_id cdc_devs[] = { .driver_info = (unsigned long)&apple_private_interface_info, }, + /* Mac */ + { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1905, 0), + .driver_info = (unsigned long)&apple_private_interface_info, + }, + { USB_DEVICE_INTERFACE_NUMBER(0x05ac, 0x1905, 2), + .driver_info = (unsigned long)&apple_private_interface_info, + }, + /* Ericsson MBM devices like F5521gw */ { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | USB_DEVICE_ID_MATCH_VENDOR, -- cgit v1.2.3