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freebsd-skq/sys/net/ieee8023ad_lacp.c
jtl 53f4b45077 Do some minimal work to better conform to the 802.3ad (LACP) standard. 
In particular, don't set the synchronized bit for the peer unless it truly
appears to be synchronized to us. Also, don't set our own synchronized bit
unless we have actually seen a remote system.

Prior to this change, we were seeing some strange behavior, such as:

1. We send an advertisement with the Activity, Aggregation, and Default
flags, followed by an advertisement with the Activity, Aggregation,
Synchronization, and Default flags. However, we hadn't seen an
advertisement from another peer and were still advertising the default
(NULL) peer. A closer examination of the in-kernel data structures (using
kgdb) showed that the system had added the default (NULL) peer as a valid
aggregator for the segment.
2. We were receiving an advertisement from a peer that included the
default (NULL) peer instead of including our system information. However,
we responded with an advertisement that included the Synchronization flag
for both our system and the peer. (Since the peer's advertisement did not
include our system information, we shouldn't add the synchronization bit
for the peer.)

This patch corrects those two items.

Reviewed by:	smh
MFC after:	2 weeks
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D9485
2017-02-26 00:19:02 +00:00

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/* $NetBSD: ieee8023ad_lacp.c,v 1.3 2005/12/11 12:24:54 christos Exp $ */
/*-
* Copyright (c)2005 YAMAMOTO Takashi,
* Copyright (c)2008 Andrew Thompson <thompsa@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ratelimit.h"
#include <sys/param.h>
#include <sys/callout.h>
#include <sys/eventhandler.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h> /* hz */
#include <sys/socket.h> /* for net/if.h */
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <machine/stdarg.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <sys/taskqueue.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/ethernet.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_lagg.h>
#include <net/ieee8023ad_lacp.h>
/*
* actor system priority and port priority.
* XXX should be configurable.
*/
#define LACP_SYSTEM_PRIO 0x8000
#define LACP_PORT_PRIO 0x8000
const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] =
{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 };
static const struct tlv_template lacp_info_tlv_template[] = {
{ LACP_TYPE_ACTORINFO,
sizeof(struct tlvhdr) + sizeof(struct lacp_peerinfo) },
{ LACP_TYPE_PARTNERINFO,
sizeof(struct tlvhdr) + sizeof(struct lacp_peerinfo) },
{ LACP_TYPE_COLLECTORINFO,
sizeof(struct tlvhdr) + sizeof(struct lacp_collectorinfo) },
{ 0, 0 },
};
static const struct tlv_template marker_info_tlv_template[] = {
{ MARKER_TYPE_INFO,
sizeof(struct tlvhdr) + sizeof(struct lacp_markerinfo) },
{ 0, 0 },
};
static const struct tlv_template marker_response_tlv_template[] = {
{ MARKER_TYPE_RESPONSE,
sizeof(struct tlvhdr) + sizeof(struct lacp_markerinfo) },
{ 0, 0 },
};
typedef void (*lacp_timer_func_t)(struct lacp_port *);
static void lacp_fill_actorinfo(struct lacp_port *, struct lacp_peerinfo *);
static void lacp_fill_markerinfo(struct lacp_port *,
struct lacp_markerinfo *);
static uint64_t lacp_aggregator_bandwidth(struct lacp_aggregator *);
static void lacp_suppress_distributing(struct lacp_softc *,
struct lacp_aggregator *);
static void lacp_transit_expire(void *);
static void lacp_update_portmap(struct lacp_softc *);
static void lacp_select_active_aggregator(struct lacp_softc *);
static uint16_t lacp_compose_key(struct lacp_port *);
static int tlv_check(const void *, size_t, const struct tlvhdr *,
const struct tlv_template *, boolean_t);
static void lacp_tick(void *);
static void lacp_fill_aggregator_id(struct lacp_aggregator *,
const struct lacp_port *);
static void lacp_fill_aggregator_id_peer(struct lacp_peerinfo *,
const struct lacp_peerinfo *);
static int lacp_aggregator_is_compatible(const struct lacp_aggregator *,
const struct lacp_port *);
static int lacp_peerinfo_is_compatible(const struct lacp_peerinfo *,
const struct lacp_peerinfo *);
static struct lacp_aggregator *lacp_aggregator_get(struct lacp_softc *,
struct lacp_port *);
static void lacp_aggregator_addref(struct lacp_softc *,
struct lacp_aggregator *);
static void lacp_aggregator_delref(struct lacp_softc *,
struct lacp_aggregator *);
/* receive machine */
static int lacp_pdu_input(struct lacp_port *, struct mbuf *);
static int lacp_marker_input(struct lacp_port *, struct mbuf *);
static void lacp_sm_rx(struct lacp_port *, const struct lacpdu *);
static void lacp_sm_rx_timer(struct lacp_port *);
static void lacp_sm_rx_set_expired(struct lacp_port *);
static void lacp_sm_rx_update_ntt(struct lacp_port *,
const struct lacpdu *);
static void lacp_sm_rx_record_pdu(struct lacp_port *,
const struct lacpdu *);
static void lacp_sm_rx_update_selected(struct lacp_port *,
const struct lacpdu *);
static void lacp_sm_rx_record_default(struct lacp_port *);
static void lacp_sm_rx_update_default_selected(struct lacp_port *);
static void lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *,
const struct lacp_peerinfo *);
/* mux machine */
static void lacp_sm_mux(struct lacp_port *);
static void lacp_set_mux(struct lacp_port *, enum lacp_mux_state);
static void lacp_sm_mux_timer(struct lacp_port *);
/* periodic transmit machine */
static void lacp_sm_ptx_update_timeout(struct lacp_port *, uint8_t);
static void lacp_sm_ptx_tx_schedule(struct lacp_port *);
static void lacp_sm_ptx_timer(struct lacp_port *);
/* transmit machine */
static void lacp_sm_tx(struct lacp_port *);
static void lacp_sm_assert_ntt(struct lacp_port *);
static void lacp_run_timers(struct lacp_port *);
static int lacp_compare_peerinfo(const struct lacp_peerinfo *,
const struct lacp_peerinfo *);
static int lacp_compare_systemid(const struct lacp_systemid *,
const struct lacp_systemid *);
static void lacp_port_enable(struct lacp_port *);
static void lacp_port_disable(struct lacp_port *);
static void lacp_select(struct lacp_port *);
static void lacp_unselect(struct lacp_port *);
static void lacp_disable_collecting(struct lacp_port *);
static void lacp_enable_collecting(struct lacp_port *);
static void lacp_disable_distributing(struct lacp_port *);
static void lacp_enable_distributing(struct lacp_port *);
static int lacp_xmit_lacpdu(struct lacp_port *);
static int lacp_xmit_marker(struct lacp_port *);
/* Debugging */
static void lacp_dump_lacpdu(const struct lacpdu *);
static const char *lacp_format_partner(const struct lacp_peerinfo *, char *,
size_t);
static const char *lacp_format_lagid(const struct lacp_peerinfo *,
const struct lacp_peerinfo *, char *, size_t);
static const char *lacp_format_lagid_aggregator(const struct lacp_aggregator *,
char *, size_t);
static const char *lacp_format_state(uint8_t, char *, size_t);
static const char *lacp_format_mac(const uint8_t *, char *, size_t);
static const char *lacp_format_systemid(const struct lacp_systemid *, char *,
size_t);
static const char *lacp_format_portid(const struct lacp_portid *, char *,
size_t);
static void lacp_dprintf(const struct lacp_port *, const char *, ...)
__attribute__((__format__(__printf__, 2, 3)));
static VNET_DEFINE(int, lacp_debug);
#define V_lacp_debug VNET(lacp_debug)
SYSCTL_NODE(_net_link_lagg, OID_AUTO, lacp, CTLFLAG_RD, 0, "ieee802.3ad");
SYSCTL_INT(_net_link_lagg_lacp, OID_AUTO, debug, CTLFLAG_RWTUN | CTLFLAG_VNET,
&VNET_NAME(lacp_debug), 0, "Enable LACP debug logging (1=debug, 2=trace)");
static VNET_DEFINE(int, lacp_default_strict_mode) = 1;
SYSCTL_INT(_net_link_lagg_lacp, OID_AUTO, default_strict_mode, CTLFLAG_RWTUN,
&VNET_NAME(lacp_default_strict_mode), 0,
"LACP strict protocol compliance default");
#define LACP_DPRINTF(a) if (V_lacp_debug & 0x01) { lacp_dprintf a ; }
#define LACP_TRACE(a) if (V_lacp_debug & 0x02) { lacp_dprintf(a,"%s\n",__func__); }
#define LACP_TPRINTF(a) if (V_lacp_debug & 0x04) { lacp_dprintf a ; }
/*
* partner administration variables.
* XXX should be configurable.
*/
static const struct lacp_peerinfo lacp_partner_admin_optimistic = {
.lip_systemid = { .lsi_prio = 0xffff },
.lip_portid = { .lpi_prio = 0xffff },
.lip_state = LACP_STATE_SYNC | LACP_STATE_AGGREGATION |
LACP_STATE_COLLECTING | LACP_STATE_DISTRIBUTING,
};
static const struct lacp_peerinfo lacp_partner_admin_strict = {
.lip_systemid = { .lsi_prio = 0xffff },
.lip_portid = { .lpi_prio = 0xffff },
.lip_state = 0,
};
static const lacp_timer_func_t lacp_timer_funcs[LACP_NTIMER] = {
[LACP_TIMER_CURRENT_WHILE] = lacp_sm_rx_timer,
[LACP_TIMER_PERIODIC] = lacp_sm_ptx_timer,
[LACP_TIMER_WAIT_WHILE] = lacp_sm_mux_timer,
};
struct mbuf *
lacp_input(struct lagg_port *lgp, struct mbuf *m)
{
struct lacp_port *lp = LACP_PORT(lgp);
uint8_t subtype;
if (m->m_pkthdr.len < sizeof(struct ether_header) + sizeof(subtype)) {
m_freem(m);
return (NULL);
}
m_copydata(m, sizeof(struct ether_header), sizeof(subtype), &subtype);
switch (subtype) {
case SLOWPROTOCOLS_SUBTYPE_LACP:
lacp_pdu_input(lp, m);
return (NULL);
case SLOWPROTOCOLS_SUBTYPE_MARKER:
lacp_marker_input(lp, m);
return (NULL);
}
/* Not a subtype we are interested in */
return (m);
}
/*
* lacp_pdu_input: process lacpdu
*/
static int
lacp_pdu_input(struct lacp_port *lp, struct mbuf *m)
{
struct lacp_softc *lsc = lp->lp_lsc;
struct lacpdu *du;
int error = 0;
if (m->m_pkthdr.len != sizeof(*du)) {
goto bad;
}
if ((m->m_flags & M_MCAST) == 0) {
goto bad;
}
if (m->m_len < sizeof(*du)) {
m = m_pullup(m, sizeof(*du));
if (m == NULL) {
return (ENOMEM);
}
}
du = mtod(m, struct lacpdu *);
if (memcmp(&du->ldu_eh.ether_dhost,
&ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN)) {
goto bad;
}
/*
* ignore the version for compatibility with
* the future protocol revisions.
*/
#if 0
if (du->ldu_sph.sph_version != 1) {
goto bad;
}
#endif
/*
* ignore tlv types for compatibility with
* the future protocol revisions.
*/
if (tlv_check(du, sizeof(*du), &du->ldu_tlv_actor,
lacp_info_tlv_template, FALSE)) {
goto bad;
}
if (V_lacp_debug > 0) {
lacp_dprintf(lp, "lacpdu receive\n");
lacp_dump_lacpdu(du);
}
if ((1 << lp->lp_ifp->if_dunit) & lp->lp_lsc->lsc_debug.lsc_rx_test) {
LACP_TPRINTF((lp, "Dropping RX PDU\n"));
goto bad;
}
LACP_LOCK(lsc);
lacp_sm_rx(lp, du);
LACP_UNLOCK(lsc);
m_freem(m);
return (error);
bad:
m_freem(m);
return (EINVAL);
}
static void
lacp_fill_actorinfo(struct lacp_port *lp, struct lacp_peerinfo *info)
{
struct lagg_port *lgp = lp->lp_lagg;
struct lagg_softc *sc = lgp->lp_softc;
info->lip_systemid.lsi_prio = htons(LACP_SYSTEM_PRIO);
memcpy(&info->lip_systemid.lsi_mac,
IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
info->lip_portid.lpi_prio = htons(LACP_PORT_PRIO);
info->lip_portid.lpi_portno = htons(lp->lp_ifp->if_index);
info->lip_state = lp->lp_state;
}
static void
lacp_fill_markerinfo(struct lacp_port *lp, struct lacp_markerinfo *info)
{
struct ifnet *ifp = lp->lp_ifp;
/* Fill in the port index and system id (encoded as the MAC) */
info->mi_rq_port = htons(ifp->if_index);
memcpy(&info->mi_rq_system, lp->lp_systemid.lsi_mac, ETHER_ADDR_LEN);
info->mi_rq_xid = htonl(0);
}
static int
lacp_xmit_lacpdu(struct lacp_port *lp)
{
struct lagg_port *lgp = lp->lp_lagg;
struct mbuf *m;
struct lacpdu *du;
int error;
LACP_LOCK_ASSERT(lp->lp_lsc);
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL) {
return (ENOMEM);
}
m->m_len = m->m_pkthdr.len = sizeof(*du);
du = mtod(m, struct lacpdu *);
memset(du, 0, sizeof(*du));
memcpy(&du->ldu_eh.ether_dhost, ethermulticastaddr_slowprotocols,
ETHER_ADDR_LEN);
memcpy(&du->ldu_eh.ether_shost, lgp->lp_lladdr, ETHER_ADDR_LEN);
du->ldu_eh.ether_type = htons(ETHERTYPE_SLOW);
du->ldu_sph.sph_subtype = SLOWPROTOCOLS_SUBTYPE_LACP;
du->ldu_sph.sph_version = 1;
TLV_SET(&du->ldu_tlv_actor, LACP_TYPE_ACTORINFO, sizeof(du->ldu_actor));
du->ldu_actor = lp->lp_actor;
TLV_SET(&du->ldu_tlv_partner, LACP_TYPE_PARTNERINFO,
sizeof(du->ldu_partner));
du->ldu_partner = lp->lp_partner;
TLV_SET(&du->ldu_tlv_collector, LACP_TYPE_COLLECTORINFO,
sizeof(du->ldu_collector));
du->ldu_collector.lci_maxdelay = 0;
if (V_lacp_debug > 0) {
lacp_dprintf(lp, "lacpdu transmit\n");
lacp_dump_lacpdu(du);
}
m->m_flags |= M_MCAST;
/*
* XXX should use higher priority queue.
* otherwise network congestion can break aggregation.
*/
error = lagg_enqueue(lp->lp_ifp, m);
return (error);
}
static int
lacp_xmit_marker(struct lacp_port *lp)
{
struct lagg_port *lgp = lp->lp_lagg;
struct mbuf *m;
struct markerdu *mdu;
int error;
LACP_LOCK_ASSERT(lp->lp_lsc);
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL) {
return (ENOMEM);
}
m->m_len = m->m_pkthdr.len = sizeof(*mdu);
mdu = mtod(m, struct markerdu *);
memset(mdu, 0, sizeof(*mdu));
memcpy(&mdu->mdu_eh.ether_dhost, ethermulticastaddr_slowprotocols,
ETHER_ADDR_LEN);
memcpy(&mdu->mdu_eh.ether_shost, lgp->lp_lladdr, ETHER_ADDR_LEN);
mdu->mdu_eh.ether_type = htons(ETHERTYPE_SLOW);
mdu->mdu_sph.sph_subtype = SLOWPROTOCOLS_SUBTYPE_MARKER;
mdu->mdu_sph.sph_version = 1;
/* Bump the transaction id and copy over the marker info */
lp->lp_marker.mi_rq_xid = htonl(ntohl(lp->lp_marker.mi_rq_xid) + 1);
TLV_SET(&mdu->mdu_tlv, MARKER_TYPE_INFO, sizeof(mdu->mdu_info));
mdu->mdu_info = lp->lp_marker;
LACP_DPRINTF((lp, "marker transmit, port=%u, sys=%6D, id=%u\n",
ntohs(mdu->mdu_info.mi_rq_port), mdu->mdu_info.mi_rq_system, ":",
ntohl(mdu->mdu_info.mi_rq_xid)));
m->m_flags |= M_MCAST;
error = lagg_enqueue(lp->lp_ifp, m);
return (error);
}
void
lacp_linkstate(struct lagg_port *lgp)
{
struct lacp_port *lp = LACP_PORT(lgp);
struct lacp_softc *lsc = lp->lp_lsc;
struct ifnet *ifp = lgp->lp_ifp;
struct ifmediareq ifmr;
int error = 0;
u_int media;
uint8_t old_state;
uint16_t old_key;
bzero((char *)&ifmr, sizeof(ifmr));
error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
if (error != 0)
return;
LACP_LOCK(lsc);
media = ifmr.ifm_active;
LACP_DPRINTF((lp, "media changed 0x%x -> 0x%x, ether = %d, fdx = %d, "
"link = %d\n", lp->lp_media, media, IFM_TYPE(media) == IFM_ETHER,
(media & IFM_FDX) != 0, ifp->if_link_state == LINK_STATE_UP));
old_state = lp->lp_state;
old_key = lp->lp_key;
lp->lp_media = media;
/*
* If the port is not an active full duplex Ethernet link then it can
* not be aggregated.
*/
if (IFM_TYPE(media) != IFM_ETHER || (media & IFM_FDX) == 0 ||
ifp->if_link_state != LINK_STATE_UP) {
lacp_port_disable(lp);
} else {
lacp_port_enable(lp);
}
lp->lp_key = lacp_compose_key(lp);
if (old_state != lp->lp_state || old_key != lp->lp_key) {
LACP_DPRINTF((lp, "-> UNSELECTED\n"));
lp->lp_selected = LACP_UNSELECTED;
}
LACP_UNLOCK(lsc);
}
static void
lacp_tick(void *arg)
{
struct lacp_softc *lsc = arg;
struct lacp_port *lp;
LIST_FOREACH(lp, &lsc->lsc_ports, lp_next) {
if ((lp->lp_state & LACP_STATE_AGGREGATION) == 0)
continue;
CURVNET_SET(lp->lp_ifp->if_vnet);
lacp_run_timers(lp);
lacp_select(lp);
lacp_sm_mux(lp);
lacp_sm_tx(lp);
lacp_sm_ptx_tx_schedule(lp);
CURVNET_RESTORE();
}
callout_reset(&lsc->lsc_callout, hz, lacp_tick, lsc);
}
int
lacp_port_create(struct lagg_port *lgp)
{
struct lagg_softc *sc = lgp->lp_softc;
struct lacp_softc *lsc = LACP_SOFTC(sc);
struct lacp_port *lp;
struct ifnet *ifp = lgp->lp_ifp;
struct sockaddr_dl sdl;
struct ifmultiaddr *rifma = NULL;
int error;
link_init_sdl(ifp, (struct sockaddr *)&sdl, IFT_ETHER);
sdl.sdl_alen = ETHER_ADDR_LEN;
bcopy(&ethermulticastaddr_slowprotocols,
LLADDR(&sdl), ETHER_ADDR_LEN);
error = if_addmulti(ifp, (struct sockaddr *)&sdl, &rifma);
if (error) {
printf("%s: ADDMULTI failed on %s\n", __func__,
lgp->lp_ifp->if_xname);
return (error);
}
lp = malloc(sizeof(struct lacp_port),
M_DEVBUF, M_NOWAIT|M_ZERO);
if (lp == NULL)
return (ENOMEM);
LACP_LOCK(lsc);
lgp->lp_psc = lp;
lp->lp_ifp = ifp;
lp->lp_lagg = lgp;
lp->lp_lsc = lsc;
lp->lp_ifma = rifma;
LIST_INSERT_HEAD(&lsc->lsc_ports, lp, lp_next);
lacp_fill_actorinfo(lp, &lp->lp_actor);
lacp_fill_markerinfo(lp, &lp->lp_marker);
lp->lp_state = LACP_STATE_ACTIVITY;
lp->lp_aggregator = NULL;
lacp_sm_rx_set_expired(lp);
LACP_UNLOCK(lsc);
lacp_linkstate(lgp);
return (0);
}
void
lacp_port_destroy(struct lagg_port *lgp)
{
struct lacp_port *lp = LACP_PORT(lgp);
struct lacp_softc *lsc = lp->lp_lsc;
int i;
LACP_LOCK(lsc);
for (i = 0; i < LACP_NTIMER; i++) {
LACP_TIMER_DISARM(lp, i);
}
lacp_disable_collecting(lp);
lacp_disable_distributing(lp);
lacp_unselect(lp);
LIST_REMOVE(lp, lp_next);
LACP_UNLOCK(lsc);
/* The address may have already been removed by if_purgemaddrs() */
if (!lgp->lp_detaching)
if_delmulti_ifma(lp->lp_ifma);
free(lp, M_DEVBUF);
}
void
lacp_req(struct lagg_softc *sc, void *data)
{
struct lacp_opreq *req = (struct lacp_opreq *)data;
struct lacp_softc *lsc = LACP_SOFTC(sc);
struct lacp_aggregator *la;
bzero(req, sizeof(struct lacp_opreq));
/*
* If the LACP softc is NULL, return with the opreq structure full of
* zeros. It is normal for the softc to be NULL while the lagg is
* being destroyed.
*/
if (NULL == lsc)
return;
la = lsc->lsc_active_aggregator;
LACP_LOCK(lsc);
if (la != NULL) {
req->actor_prio = ntohs(la->la_actor.lip_systemid.lsi_prio);
memcpy(&req->actor_mac, &la->la_actor.lip_systemid.lsi_mac,
ETHER_ADDR_LEN);
req->actor_key = ntohs(la->la_actor.lip_key);
req->actor_portprio = ntohs(la->la_actor.lip_portid.lpi_prio);
req->actor_portno = ntohs(la->la_actor.lip_portid.lpi_portno);
req->actor_state = la->la_actor.lip_state;
req->partner_prio = ntohs(la->la_partner.lip_systemid.lsi_prio);
memcpy(&req->partner_mac, &la->la_partner.lip_systemid.lsi_mac,
ETHER_ADDR_LEN);
req->partner_key = ntohs(la->la_partner.lip_key);
req->partner_portprio = ntohs(la->la_partner.lip_portid.lpi_prio);
req->partner_portno = ntohs(la->la_partner.lip_portid.lpi_portno);
req->partner_state = la->la_partner.lip_state;
}
LACP_UNLOCK(lsc);
}
void
lacp_portreq(struct lagg_port *lgp, void *data)
{
struct lacp_opreq *req = (struct lacp_opreq *)data;
struct lacp_port *lp = LACP_PORT(lgp);
struct lacp_softc *lsc = lp->lp_lsc;
LACP_LOCK(lsc);
req->actor_prio = ntohs(lp->lp_actor.lip_systemid.lsi_prio);
memcpy(&req->actor_mac, &lp->lp_actor.lip_systemid.lsi_mac,
ETHER_ADDR_LEN);
req->actor_key = ntohs(lp->lp_actor.lip_key);
req->actor_portprio = ntohs(lp->lp_actor.lip_portid.lpi_prio);
req->actor_portno = ntohs(lp->lp_actor.lip_portid.lpi_portno);
req->actor_state = lp->lp_actor.lip_state;
req->partner_prio = ntohs(lp->lp_partner.lip_systemid.lsi_prio);
memcpy(&req->partner_mac, &lp->lp_partner.lip_systemid.lsi_mac,
ETHER_ADDR_LEN);
req->partner_key = ntohs(lp->lp_partner.lip_key);
req->partner_portprio = ntohs(lp->lp_partner.lip_portid.lpi_prio);
req->partner_portno = ntohs(lp->lp_partner.lip_portid.lpi_portno);
req->partner_state = lp->lp_partner.lip_state;
LACP_UNLOCK(lsc);
}
static void
lacp_disable_collecting(struct lacp_port *lp)
{
LACP_DPRINTF((lp, "collecting disabled\n"));
lp->lp_state &= ~LACP_STATE_COLLECTING;
}
static void
lacp_enable_collecting(struct lacp_port *lp)
{
LACP_DPRINTF((lp, "collecting enabled\n"));
lp->lp_state |= LACP_STATE_COLLECTING;
}
static void
lacp_disable_distributing(struct lacp_port *lp)
{
struct lacp_aggregator *la = lp->lp_aggregator;
struct lacp_softc *lsc = lp->lp_lsc;
struct lagg_softc *sc = lsc->lsc_softc;
char buf[LACP_LAGIDSTR_MAX+1];
LACP_LOCK_ASSERT(lsc);
if (la == NULL || (lp->lp_state & LACP_STATE_DISTRIBUTING) == 0) {
return;
}
KASSERT(!TAILQ_EMPTY(&la->la_ports), ("no aggregator ports"));
KASSERT(la->la_nports > 0, ("nports invalid (%d)", la->la_nports));
KASSERT(la->la_refcnt >= la->la_nports, ("aggregator refcnt invalid"));
LACP_DPRINTF((lp, "disable distributing on aggregator %s, "
"nports %d -> %d\n",
lacp_format_lagid_aggregator(la, buf, sizeof(buf)),
la->la_nports, la->la_nports - 1));
TAILQ_REMOVE(&la->la_ports, lp, lp_dist_q);
la->la_nports--;
sc->sc_active = la->la_nports;
if (lsc->lsc_active_aggregator == la) {
lacp_suppress_distributing(lsc, la);
lacp_select_active_aggregator(lsc);
/* regenerate the port map, the active aggregator has changed */
lacp_update_portmap(lsc);
}
lp->lp_state &= ~LACP_STATE_DISTRIBUTING;
}
static void
lacp_enable_distributing(struct lacp_port *lp)
{
struct lacp_aggregator *la = lp->lp_aggregator;
struct lacp_softc *lsc = lp->lp_lsc;
struct lagg_softc *sc = lsc->lsc_softc;
char buf[LACP_LAGIDSTR_MAX+1];
LACP_LOCK_ASSERT(lsc);
if ((lp->lp_state & LACP_STATE_DISTRIBUTING) != 0) {
return;
}
LACP_DPRINTF((lp, "enable distributing on aggregator %s, "
"nports %d -> %d\n",
lacp_format_lagid_aggregator(la, buf, sizeof(buf)),
la->la_nports, la->la_nports + 1));
KASSERT(la->la_refcnt > la->la_nports, ("aggregator refcnt invalid"));
TAILQ_INSERT_HEAD(&la->la_ports, lp, lp_dist_q);
la->la_nports++;
sc->sc_active = la->la_nports;
lp->lp_state |= LACP_STATE_DISTRIBUTING;
if (lsc->lsc_active_aggregator == la) {
lacp_suppress_distributing(lsc, la);
lacp_update_portmap(lsc);
} else
/* try to become the active aggregator */
lacp_select_active_aggregator(lsc);
}
static void
lacp_transit_expire(void *vp)
{
struct lacp_softc *lsc = vp;
LACP_LOCK_ASSERT(lsc);
CURVNET_SET(lsc->lsc_softc->sc_ifp->if_vnet);
LACP_TRACE(NULL);
CURVNET_RESTORE();
lsc->lsc_suppress_distributing = FALSE;
}
void
lacp_attach(struct lagg_softc *sc)
{
struct lacp_softc *lsc;
lsc = malloc(sizeof(struct lacp_softc), M_DEVBUF, M_WAITOK | M_ZERO);
sc->sc_psc = lsc;
lsc->lsc_softc = sc;
lsc->lsc_hashkey = m_ether_tcpip_hash_init();
lsc->lsc_active_aggregator = NULL;
lsc->lsc_strict_mode = VNET(lacp_default_strict_mode);
LACP_LOCK_INIT(lsc);
TAILQ_INIT(&lsc->lsc_aggregators);
LIST_INIT(&lsc->lsc_ports);
callout_init_mtx(&lsc->lsc_transit_callout, &lsc->lsc_mtx, 0);
callout_init_mtx(&lsc->lsc_callout, &lsc->lsc_mtx, 0);
/* if the lagg is already up then do the same */
if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
lacp_init(sc);
}
void
lacp_detach(void *psc)
{
struct lacp_softc *lsc = (struct lacp_softc *)psc;
KASSERT(TAILQ_EMPTY(&lsc->lsc_aggregators),
("aggregators still active"));
KASSERT(lsc->lsc_active_aggregator == NULL,
("aggregator still attached"));
callout_drain(&lsc->lsc_transit_callout);
callout_drain(&lsc->lsc_callout);
LACP_LOCK_DESTROY(lsc);
free(lsc, M_DEVBUF);
}
void
lacp_init(struct lagg_softc *sc)
{
struct lacp_softc *lsc = LACP_SOFTC(sc);
LACP_LOCK(lsc);
callout_reset(&lsc->lsc_callout, hz, lacp_tick, lsc);
LACP_UNLOCK(lsc);
}
void
lacp_stop(struct lagg_softc *sc)
{
struct lacp_softc *lsc = LACP_SOFTC(sc);
LACP_LOCK(lsc);
callout_stop(&lsc->lsc_transit_callout);
callout_stop(&lsc->lsc_callout);
LACP_UNLOCK(lsc);
}
struct lagg_port *
lacp_select_tx_port(struct lagg_softc *sc, struct mbuf *m)
{
struct lacp_softc *lsc = LACP_SOFTC(sc);
struct lacp_portmap *pm;
struct lacp_port *lp;
uint32_t hash;
if (__predict_false(lsc->lsc_suppress_distributing)) {
LACP_DPRINTF((NULL, "%s: waiting transit\n", __func__));
return (NULL);
}
pm = &lsc->lsc_pmap[lsc->lsc_activemap];
if (pm->pm_count == 0) {
LACP_DPRINTF((NULL, "%s: no active aggregator\n", __func__));
return (NULL);
}
if ((sc->sc_opts & LAGG_OPT_USE_FLOWID) &&
M_HASHTYPE_GET(m) != M_HASHTYPE_NONE)
hash = m->m_pkthdr.flowid >> sc->flowid_shift;
else
hash = m_ether_tcpip_hash(sc->sc_flags, m, lsc->lsc_hashkey);
hash %= pm->pm_count;
lp = pm->pm_map[hash];
KASSERT((lp->lp_state & LACP_STATE_DISTRIBUTING) != 0,
("aggregated port is not distributing"));
return (lp->lp_lagg);
}
#ifdef RATELIMIT
struct lagg_port *
lacp_select_tx_port_by_hash(struct lagg_softc *sc, uint32_t flowid)
{
struct lacp_softc *lsc = LACP_SOFTC(sc);
struct lacp_portmap *pm;
struct lacp_port *lp;
uint32_t hash;
if (__predict_false(lsc->lsc_suppress_distributing)) {
LACP_DPRINTF((NULL, "%s: waiting transit\n", __func__));
return (NULL);
}
pm = &lsc->lsc_pmap[lsc->lsc_activemap];
if (pm->pm_count == 0) {
LACP_DPRINTF((NULL, "%s: no active aggregator\n", __func__));
return (NULL);
}
hash = flowid >> sc->flowid_shift;
hash %= pm->pm_count;
lp = pm->pm_map[hash];
return (lp->lp_lagg);
}
#endif
/*
* lacp_suppress_distributing: drop transmit packets for a while
* to preserve packet ordering.
*/
static void
lacp_suppress_distributing(struct lacp_softc *lsc, struct lacp_aggregator *la)
{
struct lacp_port *lp;
if (lsc->lsc_active_aggregator != la) {
return;
}
LACP_TRACE(NULL);
lsc->lsc_suppress_distributing = TRUE;
/* send a marker frame down each port to verify the queues are empty */
LIST_FOREACH(lp, &lsc->lsc_ports, lp_next) {
lp->lp_flags |= LACP_PORT_MARK;
lacp_xmit_marker(lp);
}
/* set a timeout for the marker frames */
callout_reset(&lsc->lsc_transit_callout,
LACP_TRANSIT_DELAY * hz / 1000, lacp_transit_expire, lsc);
}
static int
lacp_compare_peerinfo(const struct lacp_peerinfo *a,
const struct lacp_peerinfo *b)
{
return (memcmp(a, b, offsetof(struct lacp_peerinfo, lip_state)));
}
static int
lacp_compare_systemid(const struct lacp_systemid *a,
const struct lacp_systemid *b)
{
return (memcmp(a, b, sizeof(*a)));
}
#if 0 /* unused */
static int
lacp_compare_portid(const struct lacp_portid *a,
const struct lacp_portid *b)
{
return (memcmp(a, b, sizeof(*a)));
}
#endif
static uint64_t
lacp_aggregator_bandwidth(struct lacp_aggregator *la)
{
struct lacp_port *lp;
uint64_t speed;
lp = TAILQ_FIRST(&la->la_ports);
if (lp == NULL) {
return (0);
}
speed = ifmedia_baudrate(lp->lp_media);
speed *= la->la_nports;
if (speed == 0) {
LACP_DPRINTF((lp, "speed 0? media=0x%x nports=%d\n",
lp->lp_media, la->la_nports));
}
return (speed);
}
/*
* lacp_select_active_aggregator: select an aggregator to be used to transmit
* packets from lagg(4) interface.
*/
static void
lacp_select_active_aggregator(struct lacp_softc *lsc)
{
struct lacp_aggregator *la;
struct lacp_aggregator *best_la = NULL;
uint64_t best_speed = 0;
char buf[LACP_LAGIDSTR_MAX+1];
LACP_TRACE(NULL);
TAILQ_FOREACH(la, &lsc->lsc_aggregators, la_q) {
uint64_t speed;
if (la->la_nports == 0) {
continue;
}
speed = lacp_aggregator_bandwidth(la);
LACP_DPRINTF((NULL, "%s, speed=%jd, nports=%d\n",
lacp_format_lagid_aggregator(la, buf, sizeof(buf)),
speed, la->la_nports));
/*
* This aggregator is chosen if the partner has a better
* system priority or, the total aggregated speed is higher
* or, it is already the chosen aggregator
*/
if ((best_la != NULL && LACP_SYS_PRI(la->la_partner) <
LACP_SYS_PRI(best_la->la_partner)) ||
speed > best_speed ||
(speed == best_speed &&
la == lsc->lsc_active_aggregator)) {
best_la = la;
best_speed = speed;
}
}
KASSERT(best_la == NULL || best_la->la_nports > 0,
("invalid aggregator refcnt"));
KASSERT(best_la == NULL || !TAILQ_EMPTY(&best_la->la_ports),
("invalid aggregator list"));
if (lsc->lsc_active_aggregator != best_la) {
LACP_DPRINTF((NULL, "active aggregator changed\n"));
LACP_DPRINTF((NULL, "old %s\n",
lacp_format_lagid_aggregator(lsc->lsc_active_aggregator,
buf, sizeof(buf))));
} else {
LACP_DPRINTF((NULL, "active aggregator not changed\n"));
}
LACP_DPRINTF((NULL, "new %s\n",
lacp_format_lagid_aggregator(best_la, buf, sizeof(buf))));
if (lsc->lsc_active_aggregator != best_la) {
lsc->lsc_active_aggregator = best_la;
lacp_update_portmap(lsc);
if (best_la) {
lacp_suppress_distributing(lsc, best_la);
}
}
}
/*
* Updated the inactive portmap array with the new list of ports and
* make it live.
*/
static void
lacp_update_portmap(struct lacp_softc *lsc)
{
struct lagg_softc *sc = lsc->lsc_softc;
struct lacp_aggregator *la;
struct lacp_portmap *p;
struct lacp_port *lp;
uint64_t speed;
u_int newmap;
int i;
newmap = lsc->lsc_activemap == 0 ? 1 : 0;
p = &lsc->lsc_pmap[newmap];
la = lsc->lsc_active_aggregator;
speed = 0;
bzero(p, sizeof(struct lacp_portmap));
if (la != NULL && la->la_nports > 0) {
p->pm_count = la->la_nports;
i = 0;
TAILQ_FOREACH(lp, &la->la_ports, lp_dist_q)
p->pm_map[i++] = lp;
KASSERT(i == p->pm_count, ("Invalid port count"));
speed = lacp_aggregator_bandwidth(la);
}
sc->sc_ifp->if_baudrate = speed;
/* switch the active portmap over */
atomic_store_rel_int(&lsc->lsc_activemap, newmap);
LACP_DPRINTF((NULL, "Set table %d with %d ports\n",
lsc->lsc_activemap,
lsc->lsc_pmap[lsc->lsc_activemap].pm_count));
}
static uint16_t
lacp_compose_key(struct lacp_port *lp)
{
struct lagg_port *lgp = lp->lp_lagg;
struct lagg_softc *sc = lgp->lp_softc;
u_int media = lp->lp_media;
uint16_t key;
if ((lp->lp_state & LACP_STATE_AGGREGATION) == 0) {
/*
* non-aggregatable links should have unique keys.
*
* XXX this isn't really unique as if_index is 16 bit.
*/
/* bit 0..14: (some bits of) if_index of this port */
key = lp->lp_ifp->if_index;
/* bit 15: 1 */
key |= 0x8000;
} else {
u_int subtype = IFM_SUBTYPE(media);
KASSERT(IFM_TYPE(media) == IFM_ETHER, ("invalid media type"));
KASSERT((media & IFM_FDX) != 0, ("aggregating HDX interface"));
/* bit 0..4: IFM_SUBTYPE modulo speed */
switch (subtype) {
case IFM_10_T:
case IFM_10_2:
case IFM_10_5:
case IFM_10_STP:
case IFM_10_FL:
key = IFM_10_T;
break;
case IFM_100_TX:
case IFM_100_FX:
case IFM_100_T4:
case IFM_100_VG:
case IFM_100_T2:
case IFM_100_T:
key = IFM_100_TX;
break;
case IFM_1000_SX:
case IFM_1000_LX:
case IFM_1000_CX:
case IFM_1000_T:
case IFM_1000_KX:
case IFM_1000_SGMII:
case IFM_1000_CX_SGMII:
key = IFM_1000_SX;
break;
case IFM_10G_LR:
case IFM_10G_SR:
case IFM_10G_CX4:
case IFM_10G_TWINAX:
case IFM_10G_TWINAX_LONG:
case IFM_10G_LRM:
case IFM_10G_T:
case IFM_10G_KX4:
case IFM_10G_KR:
case IFM_10G_CR1:
case IFM_10G_ER:
case IFM_10G_SFI:
key = IFM_10G_LR;
break;
case IFM_20G_KR2:
key = IFM_20G_KR2;
break;
case IFM_2500_KX:
case IFM_2500_T:
key = IFM_2500_KX;
break;
case IFM_5000_T:
key = IFM_5000_T;
break;
case IFM_50G_PCIE:
case IFM_50G_CR2:
case IFM_50G_KR2:
key = IFM_50G_PCIE;
break;
case IFM_56G_R4:
key = IFM_56G_R4;
break;
case IFM_25G_PCIE:
case IFM_25G_CR:
case IFM_25G_KR:
case IFM_25G_SR:
key = IFM_25G_PCIE;
break;
case IFM_40G_CR4:
case IFM_40G_SR4:
case IFM_40G_LR4:
case IFM_40G_XLPPI:
case IFM_40G_KR4:
key = IFM_40G_CR4;
break;
case IFM_100G_CR4:
case IFM_100G_SR4:
case IFM_100G_KR4:
case IFM_100G_LR4:
key = IFM_100G_CR4;
break;
default:
key = subtype;
break;
}
/* bit 5..14: (some bits of) if_index of lagg device */
key |= 0x7fe0 & ((sc->sc_ifp->if_index) << 5);
/* bit 15: 0 */
}
return (htons(key));
}
static void
lacp_aggregator_addref(struct lacp_softc *lsc, struct lacp_aggregator *la)
{
char buf[LACP_LAGIDSTR_MAX+1];
LACP_DPRINTF((NULL, "%s: lagid=%s, refcnt %d -> %d\n",
__func__,
lacp_format_lagid(&la->la_actor, &la->la_partner,
buf, sizeof(buf)),
la->la_refcnt, la->la_refcnt + 1));
KASSERT(la->la_refcnt > 0, ("refcount <= 0"));
la->la_refcnt++;
KASSERT(la->la_refcnt > la->la_nports, ("invalid refcount"));
}
static void
lacp_aggregator_delref(struct lacp_softc *lsc, struct lacp_aggregator *la)
{
char buf[LACP_LAGIDSTR_MAX+1];
LACP_DPRINTF((NULL, "%s: lagid=%s, refcnt %d -> %d\n",
__func__,
lacp_format_lagid(&la->la_actor, &la->la_partner,
buf, sizeof(buf)),
la->la_refcnt, la->la_refcnt - 1));
KASSERT(la->la_refcnt > la->la_nports, ("invalid refcnt"));
la->la_refcnt--;
if (la->la_refcnt > 0) {
return;
}
KASSERT(la->la_refcnt == 0, ("refcount not zero"));
KASSERT(lsc->lsc_active_aggregator != la, ("aggregator active"));
TAILQ_REMOVE(&lsc->lsc_aggregators, la, la_q);
free(la, M_DEVBUF);
}
/*
* lacp_aggregator_get: allocate an aggregator.
*/
static struct lacp_aggregator *
lacp_aggregator_get(struct lacp_softc *lsc, struct lacp_port *lp)
{
struct lacp_aggregator *la;
la = malloc(sizeof(*la), M_DEVBUF, M_NOWAIT);
if (la) {
la->la_refcnt = 1;
la->la_nports = 0;
TAILQ_INIT(&la->la_ports);
la->la_pending = 0;
TAILQ_INSERT_TAIL(&lsc->lsc_aggregators, la, la_q);
}
return (la);
}
/*
* lacp_fill_aggregator_id: setup a newly allocated aggregator from a port.
*/
static void
lacp_fill_aggregator_id(struct lacp_aggregator *la, const struct lacp_port *lp)
{
lacp_fill_aggregator_id_peer(&la->la_partner, &lp->lp_partner);
lacp_fill_aggregator_id_peer(&la->la_actor, &lp->lp_actor);
la->la_actor.lip_state = lp->lp_state & LACP_STATE_AGGREGATION;
}
static void
lacp_fill_aggregator_id_peer(struct lacp_peerinfo *lpi_aggr,
const struct lacp_peerinfo *lpi_port)
{
memset(lpi_aggr, 0, sizeof(*lpi_aggr));
lpi_aggr->lip_systemid = lpi_port->lip_systemid;
lpi_aggr->lip_key = lpi_port->lip_key;
}
/*
* lacp_aggregator_is_compatible: check if a port can join to an aggregator.
*/
static int
lacp_aggregator_is_compatible(const struct lacp_aggregator *la,
const struct lacp_port *lp)
{
if (!(lp->lp_state & LACP_STATE_AGGREGATION) ||
!(lp->lp_partner.lip_state & LACP_STATE_AGGREGATION)) {
return (0);
}
if (!(la->la_actor.lip_state & LACP_STATE_AGGREGATION)) {
return (0);
}
if (!lacp_peerinfo_is_compatible(&la->la_partner, &lp->lp_partner)) {
return (0);
}
if (!lacp_peerinfo_is_compatible(&la->la_actor, &lp->lp_actor)) {
return (0);
}
return (1);
}
static int
lacp_peerinfo_is_compatible(const struct lacp_peerinfo *a,
const struct lacp_peerinfo *b)
{
if (memcmp(&a->lip_systemid, &b->lip_systemid,
sizeof(a->lip_systemid))) {
return (0);
}
if (memcmp(&a->lip_key, &b->lip_key, sizeof(a->lip_key))) {
return (0);
}
return (1);
}
static void
lacp_port_enable(struct lacp_port *lp)
{
lp->lp_state |= LACP_STATE_AGGREGATION;
}
static void
lacp_port_disable(struct lacp_port *lp)
{
lacp_set_mux(lp, LACP_MUX_DETACHED);
lp->lp_state &= ~LACP_STATE_AGGREGATION;
lp->lp_selected = LACP_UNSELECTED;
lacp_sm_rx_record_default(lp);
lp->lp_partner.lip_state &= ~LACP_STATE_AGGREGATION;
lp->lp_state &= ~LACP_STATE_EXPIRED;
}
/*
* lacp_select: select an aggregator. create one if necessary.
*/
static void
lacp_select(struct lacp_port *lp)
{
struct lacp_softc *lsc = lp->lp_lsc;
struct lacp_aggregator *la;
char buf[LACP_LAGIDSTR_MAX+1];
if (lp->lp_aggregator) {
return;
}
/* If we haven't heard from our peer, skip this step. */
if (lp->lp_state & LACP_STATE_DEFAULTED)
return;
KASSERT(!LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE),
("timer_wait_while still active"));
LACP_DPRINTF((lp, "port lagid=%s\n",
lacp_format_lagid(&lp->lp_actor, &lp->lp_partner,
buf, sizeof(buf))));
TAILQ_FOREACH(la, &lsc->lsc_aggregators, la_q) {
if (lacp_aggregator_is_compatible(la, lp)) {
break;
}
}
if (la == NULL) {
la = lacp_aggregator_get(lsc, lp);
if (la == NULL) {
LACP_DPRINTF((lp, "aggregator creation failed\n"));
/*
* will retry on the next tick.
*/
return;
}
lacp_fill_aggregator_id(la, lp);
LACP_DPRINTF((lp, "aggregator created\n"));
} else {
LACP_DPRINTF((lp, "compatible aggregator found\n"));
if (la->la_refcnt == LACP_MAX_PORTS)
return;
lacp_aggregator_addref(lsc, la);
}
LACP_DPRINTF((lp, "aggregator lagid=%s\n",
lacp_format_lagid(&la->la_actor, &la->la_partner,
buf, sizeof(buf))));
lp->lp_aggregator = la;
lp->lp_selected = LACP_SELECTED;
}
/*
* lacp_unselect: finish unselect/detach process.
*/
static void
lacp_unselect(struct lacp_port *lp)
{
struct lacp_softc *lsc = lp->lp_lsc;
struct lacp_aggregator *la = lp->lp_aggregator;
KASSERT(!LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE),
("timer_wait_while still active"));
if (la == NULL) {
return;
}
lp->lp_aggregator = NULL;
lacp_aggregator_delref(lsc, la);
}
/* mux machine */
static void
lacp_sm_mux(struct lacp_port *lp)
{
struct lagg_port *lgp = lp->lp_lagg;
struct lagg_softc *sc = lgp->lp_softc;
enum lacp_mux_state new_state;
boolean_t p_sync =
(lp->lp_partner.lip_state & LACP_STATE_SYNC) != 0;
boolean_t p_collecting =
(lp->lp_partner.lip_state & LACP_STATE_COLLECTING) != 0;
enum lacp_selected selected = lp->lp_selected;
struct lacp_aggregator *la;
if (V_lacp_debug > 1)
lacp_dprintf(lp, "%s: state= 0x%x, selected= 0x%x, "
"p_sync= 0x%x, p_collecting= 0x%x\n", __func__,
lp->lp_mux_state, selected, p_sync, p_collecting);
re_eval:
la = lp->lp_aggregator;
KASSERT(lp->lp_mux_state == LACP_MUX_DETACHED || la != NULL,
("MUX not detached"));
new_state = lp->lp_mux_state;
switch (lp->lp_mux_state) {
case LACP_MUX_DETACHED:
if (selected != LACP_UNSELECTED) {
new_state = LACP_MUX_WAITING;
}
break;
case LACP_MUX_WAITING:
KASSERT(la->la_pending > 0 ||
!LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE),
("timer_wait_while still active"));
if (selected == LACP_SELECTED && la->la_pending == 0) {
new_state = LACP_MUX_ATTACHED;
} else if (selected == LACP_UNSELECTED) {
new_state = LACP_MUX_DETACHED;
}
break;
case LACP_MUX_ATTACHED:
if (selected == LACP_SELECTED && p_sync) {
new_state = LACP_MUX_COLLECTING;
} else if (selected != LACP_SELECTED) {
new_state = LACP_MUX_DETACHED;
}
break;
case LACP_MUX_COLLECTING:
if (selected == LACP_SELECTED && p_sync && p_collecting) {
new_state = LACP_MUX_DISTRIBUTING;
} else if (selected != LACP_SELECTED || !p_sync) {
new_state = LACP_MUX_ATTACHED;
}
break;
case LACP_MUX_DISTRIBUTING:
if (selected != LACP_SELECTED || !p_sync || !p_collecting) {
new_state = LACP_MUX_COLLECTING;
lacp_dprintf(lp, "Interface stopped DISTRIBUTING, possible flapping\n");
sc->sc_flapping++;
}
break;
default:
panic("%s: unknown state", __func__);
}
if (lp->lp_mux_state == new_state) {
return;
}
lacp_set_mux(lp, new_state);
goto re_eval;
}
static void
lacp_set_mux(struct lacp_port *lp, enum lacp_mux_state new_state)
{
struct lacp_aggregator *la = lp->lp_aggregator;
if (lp->lp_mux_state == new_state) {
return;
}
switch (new_state) {
case LACP_MUX_DETACHED:
lp->lp_state &= ~LACP_STATE_SYNC;
lacp_disable_distributing(lp);
lacp_disable_collecting(lp);
lacp_sm_assert_ntt(lp);
/* cancel timer */
if (LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE)) {
KASSERT(la->la_pending > 0,
("timer_wait_while not active"));
la->la_pending--;
}
LACP_TIMER_DISARM(lp, LACP_TIMER_WAIT_WHILE);
lacp_unselect(lp);
break;
case LACP_MUX_WAITING:
LACP_TIMER_ARM(lp, LACP_TIMER_WAIT_WHILE,
LACP_AGGREGATE_WAIT_TIME);
la->la_pending++;
break;
case LACP_MUX_ATTACHED:
lp->lp_state |= LACP_STATE_SYNC;
lacp_disable_collecting(lp);
lacp_sm_assert_ntt(lp);
break;
case LACP_MUX_COLLECTING:
lacp_enable_collecting(lp);
lacp_disable_distributing(lp);
lacp_sm_assert_ntt(lp);
break;
case LACP_MUX_DISTRIBUTING:
lacp_enable_distributing(lp);
break;
default:
panic("%s: unknown state", __func__);
}
LACP_DPRINTF((lp, "mux_state %d -> %d\n", lp->lp_mux_state, new_state));
lp->lp_mux_state = new_state;
}
static void
lacp_sm_mux_timer(struct lacp_port *lp)
{
struct lacp_aggregator *la = lp->lp_aggregator;
char buf[LACP_LAGIDSTR_MAX+1];
KASSERT(la->la_pending > 0, ("no pending event"));
LACP_DPRINTF((lp, "%s: aggregator %s, pending %d -> %d\n", __func__,
lacp_format_lagid(&la->la_actor, &la->la_partner,
buf, sizeof(buf)),
la->la_pending, la->la_pending - 1));
la->la_pending--;
}
/* periodic transmit machine */
static void
lacp_sm_ptx_update_timeout(struct lacp_port *lp, uint8_t oldpstate)
{
if (LACP_STATE_EQ(oldpstate, lp->lp_partner.lip_state,
LACP_STATE_TIMEOUT)) {
return;
}
LACP_DPRINTF((lp, "partner timeout changed\n"));
/*
* FAST_PERIODIC -> SLOW_PERIODIC
* or
* SLOW_PERIODIC (-> PERIODIC_TX) -> FAST_PERIODIC
*
* let lacp_sm_ptx_tx_schedule to update timeout.
*/
LACP_TIMER_DISARM(lp, LACP_TIMER_PERIODIC);
/*
* if timeout has been shortened, assert NTT.
*/
if ((lp->lp_partner.lip_state & LACP_STATE_TIMEOUT)) {
lacp_sm_assert_ntt(lp);
}
}
static void
lacp_sm_ptx_tx_schedule(struct lacp_port *lp)
{
int timeout;
if (!(lp->lp_state & LACP_STATE_ACTIVITY) &&
!(lp->lp_partner.lip_state & LACP_STATE_ACTIVITY)) {
/*
* NO_PERIODIC
*/
LACP_TIMER_DISARM(lp, LACP_TIMER_PERIODIC);
return;
}
if (LACP_TIMER_ISARMED(lp, LACP_TIMER_PERIODIC)) {
return;
}
timeout = (lp->lp_partner.lip_state & LACP_STATE_TIMEOUT) ?
LACP_FAST_PERIODIC_TIME : LACP_SLOW_PERIODIC_TIME;
LACP_TIMER_ARM(lp, LACP_TIMER_PERIODIC, timeout);
}
static void
lacp_sm_ptx_timer(struct lacp_port *lp)
{
lacp_sm_assert_ntt(lp);
}
static void
lacp_sm_rx(struct lacp_port *lp, const struct lacpdu *du)
{
int timeout;
/*
* check LACP_DISABLED first
*/
if (!(lp->lp_state & LACP_STATE_AGGREGATION)) {
return;
}
/*
* check loopback condition.
*/
if (!lacp_compare_systemid(&du->ldu_actor.lip_systemid,
&lp->lp_actor.lip_systemid)) {
return;
}
/*
* EXPIRED, DEFAULTED, CURRENT -> CURRENT
*/
lacp_sm_rx_update_selected(lp, du);
lacp_sm_rx_update_ntt(lp, du);
lacp_sm_rx_record_pdu(lp, du);
timeout = (lp->lp_state & LACP_STATE_TIMEOUT) ?
LACP_SHORT_TIMEOUT_TIME : LACP_LONG_TIMEOUT_TIME;
LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, timeout);
lp->lp_state &= ~LACP_STATE_EXPIRED;
/*
* kick transmit machine without waiting the next tick.
*/
lacp_sm_tx(lp);
}
static void
lacp_sm_rx_set_expired(struct lacp_port *lp)
{
lp->lp_partner.lip_state &= ~LACP_STATE_SYNC;
lp->lp_partner.lip_state |= LACP_STATE_TIMEOUT;
LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, LACP_SHORT_TIMEOUT_TIME);
lp->lp_state |= LACP_STATE_EXPIRED;
}
static void
lacp_sm_rx_timer(struct lacp_port *lp)
{
if ((lp->lp_state & LACP_STATE_EXPIRED) == 0) {
/* CURRENT -> EXPIRED */
LACP_DPRINTF((lp, "%s: CURRENT -> EXPIRED\n", __func__));
lacp_sm_rx_set_expired(lp);
} else {
/* EXPIRED -> DEFAULTED */
LACP_DPRINTF((lp, "%s: EXPIRED -> DEFAULTED\n", __func__));
lacp_sm_rx_update_default_selected(lp);
lacp_sm_rx_record_default(lp);
lp->lp_state &= ~LACP_STATE_EXPIRED;
}
}
static void
lacp_sm_rx_record_pdu(struct lacp_port *lp, const struct lacpdu *du)
{
boolean_t active;
uint8_t oldpstate;
char buf[LACP_STATESTR_MAX+1];
LACP_TRACE(lp);
oldpstate = lp->lp_partner.lip_state;
active = (du->ldu_actor.lip_state & LACP_STATE_ACTIVITY)
|| ((lp->lp_state & LACP_STATE_ACTIVITY) &&
(du->ldu_partner.lip_state & LACP_STATE_ACTIVITY));
lp->lp_partner = du->ldu_actor;
if (active &&
((LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state,
LACP_STATE_AGGREGATION) &&
!lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner))
|| (du->ldu_partner.lip_state & LACP_STATE_AGGREGATION) == 0)) {
/*
* XXX Maintain legacy behavior of leaving the
* LACP_STATE_SYNC bit unchanged from the partner's
* advertisement if lsc_strict_mode is false.
* TODO: We should re-examine the concept of the "strict mode"
* to ensure it makes sense to maintain a non-strict mode.
*/
if (lp->lp_lsc->lsc_strict_mode)
lp->lp_partner.lip_state |= LACP_STATE_SYNC;
} else {
lp->lp_partner.lip_state &= ~LACP_STATE_SYNC;
}
lp->lp_state &= ~LACP_STATE_DEFAULTED;
if (oldpstate != lp->lp_partner.lip_state) {
LACP_DPRINTF((lp, "old pstate %s\n",
lacp_format_state(oldpstate, buf, sizeof(buf))));
LACP_DPRINTF((lp, "new pstate %s\n",
lacp_format_state(lp->lp_partner.lip_state, buf,
sizeof(buf))));
}
lacp_sm_ptx_update_timeout(lp, oldpstate);
}
static void
lacp_sm_rx_update_ntt(struct lacp_port *lp, const struct lacpdu *du)
{
LACP_TRACE(lp);
if (lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner) ||
!LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state,
LACP_STATE_ACTIVITY | LACP_STATE_SYNC | LACP_STATE_AGGREGATION)) {
LACP_DPRINTF((lp, "%s: assert ntt\n", __func__));
lacp_sm_assert_ntt(lp);
}
}
static void
lacp_sm_rx_record_default(struct lacp_port *lp)
{
uint8_t oldpstate;
LACP_TRACE(lp);
oldpstate = lp->lp_partner.lip_state;
if (lp->lp_lsc->lsc_strict_mode)
lp->lp_partner = lacp_partner_admin_strict;
else
lp->lp_partner = lacp_partner_admin_optimistic;
lp->lp_state |= LACP_STATE_DEFAULTED;
lacp_sm_ptx_update_timeout(lp, oldpstate);
}
static void
lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *lp,
const struct lacp_peerinfo *info)
{
LACP_TRACE(lp);
if (lacp_compare_peerinfo(&lp->lp_partner, info) ||
!LACP_STATE_EQ(lp->lp_partner.lip_state, info->lip_state,
LACP_STATE_AGGREGATION)) {
lp->lp_selected = LACP_UNSELECTED;
/* mux machine will clean up lp->lp_aggregator */
}
}
static void
lacp_sm_rx_update_selected(struct lacp_port *lp, const struct lacpdu *du)
{
LACP_TRACE(lp);
lacp_sm_rx_update_selected_from_peerinfo(lp, &du->ldu_actor);
}
static void
lacp_sm_rx_update_default_selected(struct lacp_port *lp)
{
LACP_TRACE(lp);
if (lp->lp_lsc->lsc_strict_mode)
lacp_sm_rx_update_selected_from_peerinfo(lp,
&lacp_partner_admin_strict);
else
lacp_sm_rx_update_selected_from_peerinfo(lp,
&lacp_partner_admin_optimistic);
}
/* transmit machine */
static void
lacp_sm_tx(struct lacp_port *lp)
{
int error = 0;
if (!(lp->lp_state & LACP_STATE_AGGREGATION)
#if 1
|| (!(lp->lp_state & LACP_STATE_ACTIVITY)
&& !(lp->lp_partner.lip_state & LACP_STATE_ACTIVITY))
#endif
) {
lp->lp_flags &= ~LACP_PORT_NTT;
}
if (!(lp->lp_flags & LACP_PORT_NTT)) {
return;
}
/* Rate limit to 3 PDUs per LACP_FAST_PERIODIC_TIME */
if (ppsratecheck(&lp->lp_last_lacpdu, &lp->lp_lacpdu_sent,
(3 / LACP_FAST_PERIODIC_TIME)) == 0) {
LACP_DPRINTF((lp, "rate limited pdu\n"));
return;
}
if (((1 << lp->lp_ifp->if_dunit) & lp->lp_lsc->lsc_debug.lsc_tx_test) == 0) {
error = lacp_xmit_lacpdu(lp);
} else {
LACP_TPRINTF((lp, "Dropping TX PDU\n"));
}
if (error == 0) {
lp->lp_flags &= ~LACP_PORT_NTT;
} else {
LACP_DPRINTF((lp, "lacpdu transmit failure, error %d\n",
error));
}
}
static void
lacp_sm_assert_ntt(struct lacp_port *lp)
{
lp->lp_flags |= LACP_PORT_NTT;
}
static void
lacp_run_timers(struct lacp_port *lp)
{
int i;
for (i = 0; i < LACP_NTIMER; i++) {
KASSERT(lp->lp_timer[i] >= 0,
("invalid timer value %d", lp->lp_timer[i]));
if (lp->lp_timer[i] == 0) {
continue;
} else if (--lp->lp_timer[i] <= 0) {
if (lacp_timer_funcs[i]) {
(*lacp_timer_funcs[i])(lp);
}
}
}
}
int
lacp_marker_input(struct lacp_port *lp, struct mbuf *m)
{
struct lacp_softc *lsc = lp->lp_lsc;
struct lagg_port *lgp = lp->lp_lagg;
struct lacp_port *lp2;
struct markerdu *mdu;
int error = 0;
int pending = 0;
if (m->m_pkthdr.len != sizeof(*mdu)) {
goto bad;
}
if ((m->m_flags & M_MCAST) == 0) {
goto bad;
}
if (m->m_len < sizeof(*mdu)) {
m = m_pullup(m, sizeof(*mdu));
if (m == NULL) {
return (ENOMEM);
}
}
mdu = mtod(m, struct markerdu *);
if (memcmp(&mdu->mdu_eh.ether_dhost,
&ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN)) {
goto bad;
}
if (mdu->mdu_sph.sph_version != 1) {
goto bad;
}
switch (mdu->mdu_tlv.tlv_type) {
case MARKER_TYPE_INFO:
if (tlv_check(mdu, sizeof(*mdu), &mdu->mdu_tlv,
marker_info_tlv_template, TRUE)) {
goto bad;
}
mdu->mdu_tlv.tlv_type = MARKER_TYPE_RESPONSE;
memcpy(&mdu->mdu_eh.ether_dhost,
&ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN);
memcpy(&mdu->mdu_eh.ether_shost,
lgp->lp_lladdr, ETHER_ADDR_LEN);
error = lagg_enqueue(lp->lp_ifp, m);
break;
case MARKER_TYPE_RESPONSE:
if (tlv_check(mdu, sizeof(*mdu), &mdu->mdu_tlv,
marker_response_tlv_template, TRUE)) {
goto bad;
}
LACP_DPRINTF((lp, "marker response, port=%u, sys=%6D, id=%u\n",
ntohs(mdu->mdu_info.mi_rq_port), mdu->mdu_info.mi_rq_system,
":", ntohl(mdu->mdu_info.mi_rq_xid)));
/* Verify that it is the last marker we sent out */
if (memcmp(&mdu->mdu_info, &lp->lp_marker,
sizeof(struct lacp_markerinfo)))
goto bad;
LACP_LOCK(lsc);
lp->lp_flags &= ~LACP_PORT_MARK;
if (lsc->lsc_suppress_distributing) {
/* Check if any ports are waiting for a response */
LIST_FOREACH(lp2, &lsc->lsc_ports, lp_next) {
if (lp2->lp_flags & LACP_PORT_MARK) {
pending = 1;
break;
}
}
if (pending == 0) {
/* All interface queues are clear */
LACP_DPRINTF((NULL, "queue flush complete\n"));
lsc->lsc_suppress_distributing = FALSE;
}
}
LACP_UNLOCK(lsc);
m_freem(m);
break;
default:
goto bad;
}
return (error);
bad:
LACP_DPRINTF((lp, "bad marker frame\n"));
m_freem(m);
return (EINVAL);
}
static int
tlv_check(const void *p, size_t size, const struct tlvhdr *tlv,
const struct tlv_template *tmpl, boolean_t check_type)
{
while (/* CONSTCOND */ 1) {
if ((const char *)tlv - (const char *)p + sizeof(*tlv) > size) {
return (EINVAL);
}
if ((check_type && tlv->tlv_type != tmpl->tmpl_type) ||
tlv->tlv_length != tmpl->tmpl_length) {
return (EINVAL);
}
if (tmpl->tmpl_type == 0) {
break;
}
tlv = (const struct tlvhdr *)
((const char *)tlv + tlv->tlv_length);
tmpl++;
}
return (0);
}
/* Debugging */
const char *
lacp_format_mac(const uint8_t *mac, char *buf, size_t buflen)
{
snprintf(buf, buflen, "%02X-%02X-%02X-%02X-%02X-%02X",
(int)mac[0],
(int)mac[1],
(int)mac[2],
(int)mac[3],
(int)mac[4],
(int)mac[5]);
return (buf);
}
const char *
lacp_format_systemid(const struct lacp_systemid *sysid,
char *buf, size_t buflen)
{
char macbuf[LACP_MACSTR_MAX+1];
snprintf(buf, buflen, "%04X,%s",
ntohs(sysid->lsi_prio),
lacp_format_mac(sysid->lsi_mac, macbuf, sizeof(macbuf)));
return (buf);
}
const char *
lacp_format_portid(const struct lacp_portid *portid, char *buf, size_t buflen)
{
snprintf(buf, buflen, "%04X,%04X",
ntohs(portid->lpi_prio),
ntohs(portid->lpi_portno));
return (buf);
}
const char *
lacp_format_partner(const struct lacp_peerinfo *peer, char *buf, size_t buflen)
{
char sysid[LACP_SYSTEMIDSTR_MAX+1];
char portid[LACP_PORTIDSTR_MAX+1];
snprintf(buf, buflen, "(%s,%04X,%s)",
lacp_format_systemid(&peer->lip_systemid, sysid, sizeof(sysid)),
ntohs(peer->lip_key),
lacp_format_portid(&peer->lip_portid, portid, sizeof(portid)));
return (buf);
}
const char *
lacp_format_lagid(const struct lacp_peerinfo *a,
const struct lacp_peerinfo *b, char *buf, size_t buflen)
{
char astr[LACP_PARTNERSTR_MAX+1];
char bstr[LACP_PARTNERSTR_MAX+1];
#if 0
/*
* there's a convention to display small numbered peer
* in the left.
*/
if (lacp_compare_peerinfo(a, b) > 0) {
const struct lacp_peerinfo *t;
t = a;
a = b;
b = t;
}
#endif
snprintf(buf, buflen, "[%s,%s]",
lacp_format_partner(a, astr, sizeof(astr)),
lacp_format_partner(b, bstr, sizeof(bstr)));
return (buf);
}
const char *
lacp_format_lagid_aggregator(const struct lacp_aggregator *la,
char *buf, size_t buflen)
{
if (la == NULL) {
return ("(none)");
}
return (lacp_format_lagid(&la->la_actor, &la->la_partner, buf, buflen));
}
const char *
lacp_format_state(uint8_t state, char *buf, size_t buflen)
{
snprintf(buf, buflen, "%b", state, LACP_STATE_BITS);
return (buf);
}
static void
lacp_dump_lacpdu(const struct lacpdu *du)
{
char buf[LACP_PARTNERSTR_MAX+1];
char buf2[LACP_STATESTR_MAX+1];
printf("actor=%s\n",
lacp_format_partner(&du->ldu_actor, buf, sizeof(buf)));
printf("actor.state=%s\n",
lacp_format_state(du->ldu_actor.lip_state, buf2, sizeof(buf2)));
printf("partner=%s\n",
lacp_format_partner(&du->ldu_partner, buf, sizeof(buf)));
printf("partner.state=%s\n",
lacp_format_state(du->ldu_partner.lip_state, buf2, sizeof(buf2)));
printf("maxdelay=%d\n", ntohs(du->ldu_collector.lci_maxdelay));
}
static void
lacp_dprintf(const struct lacp_port *lp, const char *fmt, ...)
{
va_list va;
if (lp) {
printf("%s: ", lp->lp_ifp->if_xname);
}
va_start(va, fmt);
vprintf(fmt, va);
va_end(va);
}
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