Andy Roulin 54fc83a172 net: bridge: add stp_mode attribute for STP mode selection ... The bridge-stp usermode helper is currently restricted to the initial network namespace, preventing userspace STP daemons (e.g. mstpd) from operating on bridges in other network namespaces. Since commit ff62198553 ("bridge: Only call /sbin/bridge-stp for the initial network namespace"), bridges in non-init namespaces silently fall back to kernel STP with no way to use userspace STP. Add a new bridge attribute IFLA_BR_STP_MODE that allows explicit per-bridge control over STP mode selection: BR_STP_MODE_AUTO (default) - Existing behavior: invoke the /sbin/bridge-stp helper in init_net only; fall back to kernel STP if it fails or in non-init namespaces. BR_STP_MODE_USER - Directly enable userspace STP (BR_USER_STP) without invoking the helper. Works in any network namespace. Userspace is responsible for ensuring an STP daemon manages the bridge. BR_STP_MODE_KERNEL - Directly enable kernel STP (BR_KERNEL_STP) without invoking the helper. The mode can only be changed while STP is disabled, or set to the same value (-EBUSY otherwise). IFLA_BR_STP_MODE is processed before IFLA_BR_STP_STATE in br_changelink(), so both can be set atomically in a single netlink message. The mode can also be changed in the same message that disables STP. The stp_mode struct field is u8 since all possible values fit, while NLA_U32 is used for the netlink attribute since it occupies the same space in the netlink message as NLA_U8. A new stp_helper_active boolean tracks whether the /sbin/bridge-stp helper was invoked during br_stp_start(), so that br_stp_stop() only calls the helper for stop when it was called for start. This avoids calling the helper asymmetrically when stp_mode changes between start and stop. Suggested-by: Ido Schimmel <idosch@nvidia.com> Assisted-by: Claude:claude-opus-4-6 Reviewed-by: Ido Schimmel <idosch@nvidia.com> Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com> Signed-off-by: Andy Roulin <aroulin@nvidia.com> Link: https://patch.msgid.link/20260405205224.3163000-2-aroulin@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2026-04-10 15:52:24 -07:00
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asm-generic	Scheduler changes for v7.0:	2026-02-10 12:50:10 -08:00
cxl	fwctl/cxl: Fix uuid_t usage in uapi	2025-04-11 20:45:43 -03:00
drm	Merge drm/drm-fixes into drm-misc-fixes	2026-02-23 10:09:45 +01:00
fwctl	pds_fwctl: add rpc and query support	2025-03-21 20:57:55 -03:00
linux	net: bridge: add stp_mode attribute for STP mode selection	2026-04-10 15:52:24 -07:00
misc	Char/Misc/IIO/Binder changes for 6.18-rc1	2025-10-04 16:26:32 -07:00
mtd	ubi: Expose interface for detailed erase counters	2025-01-18 15:32:32 +01:00
rdma	RDMA v7.0 merge window	2026-02-12 17:05:20 -08:00
regulator	regulator: uapi: Use UAPI integer type	2025-12-22 09:00:42 +00:00
scsi	scsi: ufs: core: Improve the documentation of UFS data frames	2026-01-11 22:04:10 -05:00
sound	ASoC: SOF: ipc4-topology: Add new tokens for pipeline direction	2026-02-04 13:26:05 +00:00
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