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DrDoof
c3b4cc893b
Dynamic link aggregation on top of the static LAGG, for RTL8372/8373: receive, selection and mux state machines (coupled mux, one aggregator per group), with "lacp show" to look inside. Each of the four trunk groups runs its own aggregator on the candidate ports assigned with "lag <n> lacp <ports>"; the engine starts with the first such group and stops with the last. LACPDUs reach the CPU through the reserved-multicast trap, so delivery needs no L2 entry and nothing written per VLAN or per PVID. The trap acts on the address before the VLAN lookup and before the ingress filters, so a LACPDU also arrives on a port that admits tagged frames only and on a port STP holds in blocking, neither of which a forwarded one reaches. A trapped frame carries no VLAN tag, so lacp_in() takes the offset of the PDU body from TRAP_RX_BODY(). The action is set with trap_rma_set(), which leaves the flags sharing that register alone, and "lacp off" puts the slow-protocols drop default back. doc/lacp.md and doc/link_aggregation.md record what was measured, including why the trap looked like a dead end at first. The web UI gets a Static/LACP mode per group on the LAG page with live status, and the startup-config validator knows the per-group syntax. A host-side sandbox for the state machines runs in the test harness together with the LAG hash check. It drives both forms of an incoming LACPDU, so the body offset of a trapped one is covered as well. The L2 table page iterated with the "next unicast" read method, so static multicast entries such as an IGMP group were invisible. It now iterates with "next address", skips L3 entries (their layout carries IP addresses where a MAC is expected), and reports the lowest member of a multicast entry's port mask, so such an entry shows up as a static entry on that port. A port taken out of LACP forgets its partner, so "lacp show" after "lacp off" no longer reports one. Applying the same candidate set to a group again, as the LAG page does on every Apply, leaves the trunk alone instead of tearing it down for a second or two. lacp_in() checks the frame length and ethertype before reading a LACPDU, so a runt or a foreign frame on the slow-protocols address cannot leave stale buffer bytes as a partner. The sandbox covers these three in T20-T22. On the LAG page, LACP mode with no ports checked sends "lag N lacp off", and the startup-config validator wants at least one port after "lacp".
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/*
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* Host-build shim for rtl837x_common.h - just enough for rtl837x_lacp.c.
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* Layouts of rtl_tag/vlan_tag and the frame-desc size mirror the real header;
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* the harness static-asserts the resulting on-wire struct sizes.
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*/
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#ifndef _SHIM_RTL837X_COMMON_H_
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#define _SHIM_RTL837X_COMMON_H_
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#include <stdint.h>
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#include <string.h> /* memcpy/memset - firmware provides its own */
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struct rtl_tag {
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uint16_t tag;
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uint8_t version;
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uint8_t reason;
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uint16_t flags;
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uint16_t pmask; /* TX: port bitmask; RX: 4-bit port number */
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};
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struct vlan_tag {
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uint16_t svlan;
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uint16_t vlan;
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};
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#define RTL_TAG_SIZE (sizeof (struct rtl_tag))
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#define VLAN_TAG_SIZE (sizeof (struct vlan_tag))
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#define RTL_FRAME_TAG_ID 0x8899
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#define RTL_FRAME_TAG_VERSION 0x04
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#define RTL_FRAME_DESC_SIZE 12
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#define ETHER_HEADER_SIZE 14
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#define HTONS(n) ((uint16_t)((((uint16_t)(n)) << 8) | (((uint16_t)(n)) >> 8)))
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/* Console output - provided by the harness */
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void print_string(char *s);
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void print_byte(uint8_t b);
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void print_short(uint16_t v);
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void write_char(char c);
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#endif
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/* Host-build shim: port masks used by lacp_isolation_update() */
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#ifndef PMASK_CPU
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#define CPU_PORT 9
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#define PMASK_9 0x1ff
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#define PMASK_6 0x1f8
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#define PMASK_CPU 0x200
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#endif
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/* Host-build shim: directed-egress/strip-tag bit (bit15 of TX pmask word) */
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#ifndef RTL_TAG_ALLOW
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#define RTL_TAG_ALLOW 0x8000
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#endif
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/* Host-build shim: tag flags word bits (tag_rtl8_4) */
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#ifndef RTL_TAG_LEARN_DIS
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#define RTL_TAG_LEARN_DIS 0x0020
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#define RTL_TAG_KEEP 0x0080
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#define SYS_TICK_HZ 200
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extern volatile uint32_t ticks;
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#define TICKS_DUE(last, period) ((uint8_t)((uint8_t)ticks - (last)) >= (period))
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#endif
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