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port: add a helper to steer a link-local group via a static L2 entry

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port_l2mc_set() writes a static L2 multicast entry for a reserved group
01:80:C2:00:00:<last> in a given VLAN with a given member portmask.

Slow-protocol frames must reach the management CPU without being flooded
to other ports, but the RMA "trap" action cannot deliver to the internal
NIC on this hardware - its destination is an external CPU attached to a
physical port. The working alternative is to keep the RMA action at
"forward" and constrain the egress with a static entry: the forward
lookup then hits the entry's member mask instead of the VLAN flood mask.
Hardware-verified on a SWTGW218AS in both directions: a mask without the
CPU bit stops delivery to the CPU, a CPU-only mask delivers with no port
egress. Lookups are IVL, so callers add one entry per VID they care
about; rewriting the same MAC+VID replaces the entry in place.

Used by the BPDU containment in the next commit; the pending LACP branch
adopts it for 01:80:C2:00:00:02 the same way.
This commit is contained in:
d00f
2026-08-04 02:29:17 +02:00
parent 35941dd19f
commit c5b14e0cfb
2 changed files with 43 additions and 0 deletions
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rtl837x_port.h
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@@ -54,6 +54,7 @@ void vlan_name_remove(uint16_t vlan) __banked;
void vlan_setup(void) __banked;
void port_pvid_set(uint8_t port, __xdata uint16_t pvid) __banked;
uint16_t port_pvid_get(uint8_t port) __banked;
void port_l2mc_set(uint8_t mac_last, __xdata uint16_t vid, __xdata uint16_t pmask) __banked;
void vlan_create(void) __banked;
void vlan_delete(uint16_t vlan) __banked;
void vlan_dump(void) __banked;