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freebsd-skq/sys/net/ieee8023ad_lacp.c
will 2226bf3149 Improve the distribution of LAGG port traffic. 
I edited the original change to retain the use of arc4random() as a seed for
the hashing as a very basic defense against intentional lagg port selection.

The author's original commit message (edited slightly):

sys/net/ieee8023ad_lacp.c
sys/net/if_lagg.c
	In lagg_hashmbuf, use the FNV hash instead of the old
	hash32_buf.  The hash32 family of functions operate one octet
	at a time, and when run on a string s of length n, their output
	is equivalent to :

		   ----- i=n-1
		   \
	       n    \           (n-i-1)              32
	( seed^  +  /        33^        * s[i] ) % 2^
		   /
		   ----- i=0

	The problem is that the last five bytes of input don't get
	multiplied by sufficiently many powers of 33 to rollover 2^32.
	That means that changing the last few bytes (but obviously not
	the very last) of input will always change the value of the
	hash by a multiple of 33.  In the case of lagg_hashmbuf() with
	ipv4 input, the last four bytes are the TCP or UDP port
	numbers.  Since the output of lagg_hashmbuf is always taken
	modulo the port count, and 3 is a common port count for a lagg,
	that's bad.  It means that the UDP or TCP source port will
	never affect which lagg member is selected on a 3-port lagg.

	At 10Gbps, I was not able to measure any difference in CPU
	consumption between the old and new hash.

Submitted by:	asomers (original commit)
Reviewed by:	emaste, glebius
MFC after:	1 week
Sponsored by:	Spectra Logic
MFSpectraBSD:	1001723 on 2013/08/28 (original)
		1114258 on 2015/01/22 (edit)
2015-01-23 00:06:35 +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 <sys/param.h>
#include <sys/callout.h>
#include <sys/eventhandler.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <sys/fnv_hash.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)");
#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;
boolean_t active = TRUE; /* XXX should be configurable */
boolean_t fast = FALSE; /* XXX should be configurable */
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 =
(active ? LACP_STATE_ACTIVITY : 0) |
(fast ? LACP_STATE_TIMEOUT : 0);
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;
uint32_t seed;
lsc = malloc(sizeof(struct lacp_softc), M_DEVBUF, M_WAITOK | M_ZERO);
sc->sc_psc = lsc;
lsc->lsc_softc = sc;
seed = arc4random();
lsc->lsc_hashkey = FNV1_32_INIT;
lsc->lsc_hashkey = fnv_32_buf(&seed, sizeof(seed), lsc->lsc_hashkey);
lsc->lsc_active_aggregator = NULL;
lsc->lsc_strict_mode = 1;
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 = lagg_hashmbuf(sc, 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);
}
/*
* 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:
key = IFM_100_TX;
break;
case IFM_1000_SX:
case IFM_1000_LX:
case IFM_1000_CX:
case IFM_1000_T:
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:
key = IFM_10G_LR;
break;
case IFM_40G_CR4:
case IFM_40G_SR4:
case IFM_40G_LR4:
key = IFM_40G_CR4;
break;
default:
key = subtype;
}
/* 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;
}
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 nothing? */
} 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))));
}
/* XXX Hack, still need to implement 5.4.9 para 2,3,4 */
if (lp->lp_lsc->lsc_strict_mode)
lp->lp_partner.lip_state |= LACP_STATE_SYNC;
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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