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stp: full RSTP configuration (bridge + per-port), CLI + GUI + persistence

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Implements the standard 802.1D-2004/802.1w configuration surface:

Bridge:  priority (0-15 x4096), hello time, max age, forward delay,
         force-version (RSTP v2 / STP-compatible v0 Config BPDUs), tx hold
         count (per-port per-second BPDU budget).
Per port: enable, admin edge (forwarding immediately - no listen gap),
         auto edge (forwarding after 3 s of BPDU silence; DEFAULT, so
         host-facing ports no longer take the full forward delay),
         path cost (0=auto/20000), port priority, BPDU guard (port disabled
         on BPDU receipt), root guard (never accept a better root on the
         port), BPDU filter (no BPDUs in or out).

Engine additions: root max-age expiry (reclaim the tree when the root goes
silent), root path cost accounting (rx cost + root-port cost, advertised in
our BPDUs), loop detection (our own BPDU coming back blocks the port for a
listen period), topology-change counter, approximated per-port roles
(Root/Designated/Alternate) for diagnostics.

CLI: "stp prio|hello|maxage|fwd|txhold|version ..." and
"stp port <n> on|off|edge|cost|prio|guard|filter ..." (stp_parse, delegated
from cmd_parser); all forms accepted by the startup-config validator so the
whole configuration persists. /stp.json now reports config + status; the
Spanning Tree page exposes everything with immediate-apply controls and live
state/role columns (edit-in-flight guard against the 2 s refresh).

8051 memory: the module moves to code BANK2; internal-RAM pressure from
cross-bank calls resolved by xdata loop iterators/scratch, __reentrant on
the small helpers, and moving httpd's header-pointer globals to xdata.

Verified on hardware (SWTGW218AS): defaults land per standard; priority and
hello change live; admin-edge ports (the LACP bond uplinks) keep the LAN at
0% loss THROUGH "stp on"; auto-edge ports forward after 3 s; a port that
heard real BPDUs (a VM bridge behind physical port 6) correctly declined
auto-edge, sat out the full listen period and became Designated; tc counts
promotions; we win the root election at priority 16384 vs 32768.

(cherry picked from commit 09a34dc6acdc81ab9cab0727d2f4a59c68131a3e)
This commit is contained in:
d00f
2026-08-04 03:25:10 +02:00
parent 89cc9828c3
commit 531bbbea5d
9 changed files with 641 additions and 158 deletions
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html/config.js
+10 -1
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@@ -22,6 +22,14 @@ const conf_cmds = [
/^laghash\s+\d(\s+\w+)+$/,
/^isolate\s+\d{1,2}(\s+(off|\d{1,2}))+$/,
/^stp\s+(on|off)$/,
/^stp\s+(prio|hello|maxage|fwd|txhold)\s+\d{1,2}$/,
/^stp\s+version\s+(rstp|stp)$/,
/^stp\s+port\s+\d{1,2}\s+(on|off)$/,
/^stp\s+port\s+\d{1,2}\s+edge\s+(on|off|auto)$/,
/^stp\s+port\s+\d{1,2}\s+cost\s+\d{1,3}$/,
/^stp\s+port\s+\d{1,2}\s+prio\s+\d{1,3}$/,
/^stp\s+port\s+\d{1,2}\s+guard\s+(none|bpdu|root)$/,
/^stp\s+port\s+\d{1,2}\s+filter\s+(on|off)$/,
/^igmp\s+(on|off)$/,
/^mtu\s+\d{1,2}\s+\d+$/,
/^bw\s+(in|out)\s+\d{1,2}\s+\S+$/,
@@ -45,7 +53,8 @@ const conf_overwrite = [
/^lag\s+\d+\b/,
/^laghash\b/,
/^isolate\s+\d{1,2}\b/,
/^stp\b/,
/^stp\s+(prio|hello|maxage|fwd|txhold|version)\b/,
/^stp\s+port\s+\d{1,2}\s+(edge|cost|prio|guard|filter)\b/,
/^igmp\b/,
/^mtu\s+\d{1,2}\b/,
/^bw\s+(in|out)\s+\d{1,2}\b/,