ieee8023ad_lacp.c

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    1 /*      $NetBSD: ieee8023ad_lacp.c,v 1.3 2005/12/11 12:24:54 christos Exp $     */
    2 
    3 /*-
    4  * Copyright (c)2005 YAMAMOTO Takashi,
    5  * Copyright (c)2008 Andrew Thompson <thompsa@FreeBSD.org>
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/callout.h>
   35 #include <sys/mbuf.h>
   36 #include <sys/systm.h>
   37 #include <sys/malloc.h>
   38 #include <sys/kernel.h> /* hz */
   39 #include <sys/socket.h> /* for net/if.h */
   40 #include <sys/sockio.h>
   41 #include <machine/stdarg.h>
   42 #include <sys/lock.h>
   43 #include <sys/rwlock.h>
   44 
   45 #include <net/if.h>
   46 #include <net/if_dl.h>
   47 #include <net/ethernet.h>
   48 #include <net/if_media.h>
   49 #include <net/if_types.h>
   50 
   51 #include <net/if_lagg.h>
   52 #include <net/ieee8023ad_lacp.h>
   53 
   54 /*
   55  * actor system priority and port priority.
   56  * XXX should be configurable.
   57  */
   58 
   59 #define LACP_SYSTEM_PRIO        0x8000
   60 #define LACP_PORT_PRIO          0x8000
   61 
   62 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] =
   63     { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 };
   64 
   65 static const struct tlv_template lacp_info_tlv_template[] = {
   66         { LACP_TYPE_ACTORINFO,
   67             sizeof(struct tlvhdr) + sizeof(struct lacp_peerinfo) },
   68         { LACP_TYPE_PARTNERINFO,
   69             sizeof(struct tlvhdr) + sizeof(struct lacp_peerinfo) },
   70         { LACP_TYPE_COLLECTORINFO,
   71             sizeof(struct tlvhdr) + sizeof(struct lacp_collectorinfo) },
   72         { 0, 0 },
   73 };
   74 
   75 static const struct tlv_template marker_info_tlv_template[] = {
   76         { MARKER_TYPE_INFO,
   77             sizeof(struct tlvhdr) + sizeof(struct lacp_markerinfo) },
   78         { 0, 0 },
   79 };
   80 
   81 static const struct tlv_template marker_response_tlv_template[] = {
   82         { MARKER_TYPE_RESPONSE,
   83             sizeof(struct tlvhdr) + sizeof(struct lacp_markerinfo) },
   84         { 0, 0 },
   85 };
   86 
   87 typedef void (*lacp_timer_func_t)(struct lacp_port *);
   88 
   89 static void     lacp_fill_actorinfo(struct lacp_port *, struct lacp_peerinfo *);
   90 static void     lacp_fill_markerinfo(struct lacp_port *,
   91                     struct lacp_markerinfo *);
   92 
   93 static uint64_t lacp_aggregator_bandwidth(struct lacp_aggregator *);
   94 static void     lacp_suppress_distributing(struct lacp_softc *,
   95                     struct lacp_aggregator *);
   96 static void     lacp_transit_expire(void *);
   97 static void     lacp_update_portmap(struct lacp_softc *);
   98 static void     lacp_select_active_aggregator(struct lacp_softc *);
   99 static uint16_t lacp_compose_key(struct lacp_port *);
  100 static int      tlv_check(const void *, size_t, const struct tlvhdr *,
  101                     const struct tlv_template *, boolean_t);
  102 static void     lacp_tick(void *);
  103 
  104 static void     lacp_fill_aggregator_id(struct lacp_aggregator *,
  105                     const struct lacp_port *);
  106 static void     lacp_fill_aggregator_id_peer(struct lacp_peerinfo *,
  107                     const struct lacp_peerinfo *);
  108 static int      lacp_aggregator_is_compatible(const struct lacp_aggregator *,
  109                     const struct lacp_port *);
  110 static int      lacp_peerinfo_is_compatible(const struct lacp_peerinfo *,
  111                     const struct lacp_peerinfo *);
  112 
  113 static struct lacp_aggregator *lacp_aggregator_get(struct lacp_softc *,
  114                     struct lacp_port *);
  115 static void     lacp_aggregator_addref(struct lacp_softc *,
  116                     struct lacp_aggregator *);
  117 static void     lacp_aggregator_delref(struct lacp_softc *,
  118                     struct lacp_aggregator *);
  119 
  120 /* receive machine */
  121 
  122 static int      lacp_pdu_input(struct lacp_port *, struct mbuf *);
  123 static int      lacp_marker_input(struct lacp_port *, struct mbuf *);
  124 static void     lacp_sm_rx(struct lacp_port *, const struct lacpdu *);
  125 static void     lacp_sm_rx_timer(struct lacp_port *);
  126 static void     lacp_sm_rx_set_expired(struct lacp_port *);
  127 static void     lacp_sm_rx_update_ntt(struct lacp_port *,
  128                     const struct lacpdu *);
  129 static void     lacp_sm_rx_record_pdu(struct lacp_port *,
  130                     const struct lacpdu *);
  131 static void     lacp_sm_rx_update_selected(struct lacp_port *,
  132                     const struct lacpdu *);
  133 static void     lacp_sm_rx_record_default(struct lacp_port *);
  134 static void     lacp_sm_rx_update_default_selected(struct lacp_port *);
  135 static void     lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *,
  136                     const struct lacp_peerinfo *);
  137 
  138 /* mux machine */
  139 
  140 static void     lacp_sm_mux(struct lacp_port *);
  141 static void     lacp_set_mux(struct lacp_port *, enum lacp_mux_state);
  142 static void     lacp_sm_mux_timer(struct lacp_port *);
  143 
  144 /* periodic transmit machine */
  145 
  146 static void     lacp_sm_ptx_update_timeout(struct lacp_port *, uint8_t);
  147 static void     lacp_sm_ptx_tx_schedule(struct lacp_port *);
  148 static void     lacp_sm_ptx_timer(struct lacp_port *);
  149 
  150 /* transmit machine */
  151 
  152 static void     lacp_sm_tx(struct lacp_port *);
  153 static void     lacp_sm_assert_ntt(struct lacp_port *);
  154 
  155 static void     lacp_run_timers(struct lacp_port *);
  156 static int      lacp_compare_peerinfo(const struct lacp_peerinfo *,
  157                     const struct lacp_peerinfo *);
  158 static int      lacp_compare_systemid(const struct lacp_systemid *,
  159                     const struct lacp_systemid *);
  160 static void     lacp_port_enable(struct lacp_port *);
  161 static void     lacp_port_disable(struct lacp_port *);
  162 static void     lacp_select(struct lacp_port *);
  163 static void     lacp_unselect(struct lacp_port *);
  164 static void     lacp_disable_collecting(struct lacp_port *);
  165 static void     lacp_enable_collecting(struct lacp_port *);
  166 static void     lacp_disable_distributing(struct lacp_port *);
  167 static void     lacp_enable_distributing(struct lacp_port *);
  168 static int      lacp_xmit_lacpdu(struct lacp_port *);
  169 static int      lacp_xmit_marker(struct lacp_port *);
  170 
  171 #if defined(LACP_DEBUG)
  172 static void     lacp_dump_lacpdu(const struct lacpdu *);
  173 static const char *lacp_format_partner(const struct lacp_peerinfo *, char *,
  174                     size_t);
  175 static const char *lacp_format_lagid(const struct lacp_peerinfo *,
  176                     const struct lacp_peerinfo *, char *, size_t);
  177 static const char *lacp_format_lagid_aggregator(const struct lacp_aggregator *,
  178                     char *, size_t);
  179 static const char *lacp_format_state(uint8_t, char *, size_t);
  180 static const char *lacp_format_mac(const uint8_t *, char *, size_t);
  181 static const char *lacp_format_systemid(const struct lacp_systemid *, char *,
  182                     size_t);
  183 static const char *lacp_format_portid(const struct lacp_portid *, char *,
  184                     size_t);
  185 static void     lacp_dprintf(const struct lacp_port *, const char *, ...)
  186                     __attribute__((__format__(__printf__, 2, 3)));
  187 #define LACP_DPRINTF(a) lacp_dprintf a
  188 #else
  189 #define LACP_DPRINTF(a) /* nothing */
  190 #endif
  191 
  192 /*
  193  * partner administration variables.
  194  * XXX should be configurable.
  195  */
  196 
  197 static const struct lacp_peerinfo lacp_partner_admin = {
  198         .lip_systemid = { .lsi_prio = 0xffff },
  199         .lip_portid = { .lpi_prio = 0xffff },
  200 #if 1
  201         /* optimistic */
  202         .lip_state = LACP_STATE_SYNC | LACP_STATE_AGGREGATION |
  203             LACP_STATE_COLLECTING | LACP_STATE_DISTRIBUTING,
  204 #else
  205         /* pessimistic */
  206         .lip_state = 0,
  207 #endif
  208 };
  209 
  210 static const lacp_timer_func_t lacp_timer_funcs[LACP_NTIMER] = {
  211         [LACP_TIMER_CURRENT_WHILE] = lacp_sm_rx_timer,
  212         [LACP_TIMER_PERIODIC] = lacp_sm_ptx_timer,
  213         [LACP_TIMER_WAIT_WHILE] = lacp_sm_mux_timer,
  214 };
  215 
  216 struct mbuf *
  217 lacp_input(struct lagg_port *lgp, struct mbuf *m)
  218 {
  219         struct lacp_port *lp = LACP_PORT(lgp);
  220         uint8_t subtype;
  221 
  222         if (m->m_pkthdr.len < sizeof(struct ether_header) + sizeof(subtype)) {
  223                 m_freem(m);
  224                 return (NULL);
  225         }
  226 
  227         m_copydata(m, sizeof(struct ether_header), sizeof(subtype), &subtype);
  228         switch (subtype) {
  229                 case SLOWPROTOCOLS_SUBTYPE_LACP:
  230                         lacp_pdu_input(lp, m);
  231                         return (NULL);
  232 
  233                 case SLOWPROTOCOLS_SUBTYPE_MARKER:
  234                         lacp_marker_input(lp, m);
  235                         return (NULL);
  236         }
  237 
  238         /* Not a subtype we are interested in */
  239         return (m);
  240 }
  241 
  242 /*
  243  * lacp_pdu_input: process lacpdu
  244  */
  245 static int
  246 lacp_pdu_input(struct lacp_port *lp, struct mbuf *m)
  247 {
  248         struct lacp_softc *lsc = lp->lp_lsc;
  249         struct lacpdu *du;
  250         int error = 0;
  251 
  252         if (m->m_pkthdr.len != sizeof(*du)) {
  253                 goto bad;
  254         }
  255 
  256         if ((m->m_flags & M_MCAST) == 0) {
  257                 goto bad;
  258         }
  259 
  260         if (m->m_len < sizeof(*du)) {
  261                 m = m_pullup(m, sizeof(*du));
  262                 if (m == NULL) {
  263                         return (ENOMEM);
  264                 }
  265         }
  266 
  267         du = mtod(m, struct lacpdu *);
  268 
  269         if (memcmp(&du->ldu_eh.ether_dhost,
  270             &ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN)) {
  271                 goto bad;
  272         }
  273 
  274         /*
  275          * ignore the version for compatibility with
  276          * the future protocol revisions.
  277          */
  278 #if 0
  279         if (du->ldu_sph.sph_version != 1) {
  280                 goto bad;
  281         }
  282 #endif
  283 
  284         /*
  285          * ignore tlv types for compatibility with
  286          * the future protocol revisions.
  287          */
  288         if (tlv_check(du, sizeof(*du), &du->ldu_tlv_actor,
  289             lacp_info_tlv_template, FALSE)) {
  290                 goto bad;
  291         }
  292 
  293 #if defined(LACP_DEBUG)
  294         LACP_DPRINTF((lp, "lacpdu receive\n"));
  295         lacp_dump_lacpdu(du);
  296 #endif /* defined(LACP_DEBUG) */
  297 
  298         LACP_LOCK(lsc);
  299         lacp_sm_rx(lp, du);
  300         LACP_UNLOCK(lsc);
  301 
  302         m_freem(m);
  303         return (error);
  304 
  305 bad:
  306         m_freem(m);
  307         return (EINVAL);
  308 }
  309 
  310 static void
  311 lacp_fill_actorinfo(struct lacp_port *lp, struct lacp_peerinfo *info)
  312 {
  313         struct lagg_port *lgp = lp->lp_lagg;
  314         struct lagg_softc *sc = lgp->lp_softc;
  315 
  316         info->lip_systemid.lsi_prio = htons(LACP_SYSTEM_PRIO);
  317         memcpy(&info->lip_systemid.lsi_mac,
  318             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
  319         info->lip_portid.lpi_prio = htons(LACP_PORT_PRIO);
  320         info->lip_portid.lpi_portno = htons(lp->lp_ifp->if_index);
  321         info->lip_state = lp->lp_state;
  322 }
  323 
  324 static void
  325 lacp_fill_markerinfo(struct lacp_port *lp, struct lacp_markerinfo *info)
  326 {
  327         struct ifnet *ifp = lp->lp_ifp;
  328 
  329         /* Fill in the port index and system id (encoded as the MAC) */
  330         info->mi_rq_port = htons(ifp->if_index);
  331         memcpy(&info->mi_rq_system, lp->lp_systemid.lsi_mac, ETHER_ADDR_LEN);
  332         info->mi_rq_xid = htonl(0);
  333 }
  334 
  335 static int
  336 lacp_xmit_lacpdu(struct lacp_port *lp)
  337 {
  338         struct lagg_port *lgp = lp->lp_lagg;
  339         struct mbuf *m;
  340         struct lacpdu *du;
  341         int error;
  342 
  343         LACP_LOCK_ASSERT(lp->lp_lsc);
  344 
  345         m = m_gethdr(M_DONTWAIT, MT_DATA);
  346         if (m == NULL) {
  347                 return (ENOMEM);
  348         }
  349         m->m_len = m->m_pkthdr.len = sizeof(*du);
  350 
  351         du = mtod(m, struct lacpdu *);
  352         memset(du, 0, sizeof(*du));
  353 
  354         memcpy(&du->ldu_eh.ether_dhost, ethermulticastaddr_slowprotocols,
  355             ETHER_ADDR_LEN);
  356         memcpy(&du->ldu_eh.ether_shost, lgp->lp_lladdr, ETHER_ADDR_LEN);
  357         du->ldu_eh.ether_type = htons(ETHERTYPE_SLOW);
  358 
  359         du->ldu_sph.sph_subtype = SLOWPROTOCOLS_SUBTYPE_LACP;
  360         du->ldu_sph.sph_version = 1;
  361 
  362         TLV_SET(&du->ldu_tlv_actor, LACP_TYPE_ACTORINFO, sizeof(du->ldu_actor));
  363         du->ldu_actor = lp->lp_actor;
  364 
  365         TLV_SET(&du->ldu_tlv_partner, LACP_TYPE_PARTNERINFO,
  366             sizeof(du->ldu_partner));
  367         du->ldu_partner = lp->lp_partner;
  368 
  369         TLV_SET(&du->ldu_tlv_collector, LACP_TYPE_COLLECTORINFO,
  370             sizeof(du->ldu_collector));
  371         du->ldu_collector.lci_maxdelay = 0;
  372 
  373 #if defined(LACP_DEBUG)
  374         LACP_DPRINTF((lp, "lacpdu transmit\n"));
  375         lacp_dump_lacpdu(du);
  376 #endif /* defined(LACP_DEBUG) */
  377 
  378         m->m_flags |= M_MCAST;
  379 
  380         /*
  381          * XXX should use higher priority queue.
  382          * otherwise network congestion can break aggregation.
  383          */
  384 
  385         error = lagg_enqueue(lp->lp_ifp, m);
  386         return (error);
  387 }
  388 
  389 static int
  390 lacp_xmit_marker(struct lacp_port *lp)
  391 {
  392         struct lagg_port *lgp = lp->lp_lagg;
  393         struct mbuf *m;
  394         struct markerdu *mdu;
  395         int error;
  396 
  397         LACP_LOCK_ASSERT(lp->lp_lsc);
  398 
  399         m = m_gethdr(M_DONTWAIT, MT_DATA);
  400         if (m == NULL) {
  401                 return (ENOMEM);
  402         }
  403         m->m_len = m->m_pkthdr.len = sizeof(*mdu);
  404 
  405         mdu = mtod(m, struct markerdu *);
  406         memset(mdu, 0, sizeof(*mdu));
  407 
  408         memcpy(&mdu->mdu_eh.ether_dhost, ethermulticastaddr_slowprotocols,
  409             ETHER_ADDR_LEN);
  410         memcpy(&mdu->mdu_eh.ether_shost, lgp->lp_lladdr, ETHER_ADDR_LEN);
  411         mdu->mdu_eh.ether_type = htons(ETHERTYPE_SLOW);
  412 
  413         mdu->mdu_sph.sph_subtype = SLOWPROTOCOLS_SUBTYPE_MARKER;
  414         mdu->mdu_sph.sph_version = 1;
  415 
  416         /* Bump the transaction id and copy over the marker info */
  417         lp->lp_marker.mi_rq_xid = htonl(ntohl(lp->lp_marker.mi_rq_xid) + 1);
  418         TLV_SET(&mdu->mdu_tlv, MARKER_TYPE_INFO, sizeof(mdu->mdu_info));
  419         mdu->mdu_info = lp->lp_marker;
  420 
  421         LACP_DPRINTF((lp, "marker transmit, port=%u, sys=%6D, id=%u\n",
  422             ntohs(mdu->mdu_info.mi_rq_port), mdu->mdu_info.mi_rq_system, ":",
  423             ntohl(mdu->mdu_info.mi_rq_xid)));
  424 
  425         m->m_flags |= M_MCAST;
  426         error = lagg_enqueue(lp->lp_ifp, m);
  427         return (error);
  428 }
  429 
  430 void
  431 lacp_linkstate(struct lagg_port *lgp)
  432 {
  433         struct lacp_port *lp = LACP_PORT(lgp);
  434         struct lacp_softc *lsc = lp->lp_lsc;
  435         struct ifnet *ifp = lgp->lp_ifp;
  436         struct ifmediareq ifmr;
  437         int error = 0;
  438         u_int media;
  439         uint8_t old_state;
  440         uint16_t old_key;
  441 
  442         bzero((char *)&ifmr, sizeof(ifmr));
  443         error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
  444         if (error != 0)
  445                 return;
  446 
  447         LACP_LOCK(lsc);
  448         media = ifmr.ifm_active;
  449         LACP_DPRINTF((lp, "media changed 0x%x -> 0x%x, ether = %d, fdx = %d, "
  450             "link = %d\n", lp->lp_media, media, IFM_TYPE(media) == IFM_ETHER,
  451             (media & IFM_FDX) != 0, ifp->if_link_state == LINK_STATE_UP));
  452         old_state = lp->lp_state;
  453         old_key = lp->lp_key;
  454 
  455         lp->lp_media = media;
  456         /*
  457          * If the port is not an active full duplex Ethernet link then it can
  458          * not be aggregated.
  459          */
  460         if (IFM_TYPE(media) != IFM_ETHER || (media & IFM_FDX) == 0 ||
  461             ifp->if_link_state != LINK_STATE_UP) {
  462                 lacp_port_disable(lp);
  463         } else {
  464                 lacp_port_enable(lp);
  465         }
  466         lp->lp_key = lacp_compose_key(lp);
  467 
  468         if (old_state != lp->lp_state || old_key != lp->lp_key) {
  469                 LACP_DPRINTF((lp, "-> UNSELECTED\n"));
  470                 lp->lp_selected = LACP_UNSELECTED;
  471         }
  472         LACP_UNLOCK(lsc);
  473 }
  474 
  475 static void
  476 lacp_tick(void *arg)
  477 {
  478         struct lacp_softc *lsc = arg;
  479         struct lacp_port *lp;
  480 
  481         LIST_FOREACH(lp, &lsc->lsc_ports, lp_next) {
  482                 if ((lp->lp_state & LACP_STATE_AGGREGATION) == 0)
  483                         continue;
  484 
  485                 lacp_run_timers(lp);
  486 
  487                 lacp_select(lp);
  488                 lacp_sm_mux(lp);
  489                 lacp_sm_tx(lp);
  490                 lacp_sm_ptx_tx_schedule(lp);
  491         }
  492         callout_reset(&lsc->lsc_callout, hz, lacp_tick, lsc);
  493 }
  494 
  495 int
  496 lacp_port_create(struct lagg_port *lgp)
  497 {
  498         struct lagg_softc *sc = lgp->lp_softc;
  499         struct lacp_softc *lsc = LACP_SOFTC(sc);
  500         struct lacp_port *lp;
  501         struct ifnet *ifp = lgp->lp_ifp;
  502         struct sockaddr_dl sdl;
  503         struct ifmultiaddr *rifma = NULL;
  504         int error;
  505 
  506         boolean_t active = TRUE; /* XXX should be configurable */
  507         boolean_t fast = FALSE; /* XXX should be configurable */
  508 
  509         bzero((char *)&sdl, sizeof(sdl));
  510         sdl.sdl_len = sizeof(sdl);
  511         sdl.sdl_family = AF_LINK;
  512         sdl.sdl_index = ifp->if_index;
  513         sdl.sdl_type = IFT_ETHER;
  514         sdl.sdl_alen = ETHER_ADDR_LEN;
  515 
  516         bcopy(&ethermulticastaddr_slowprotocols,
  517             LLADDR(&sdl), ETHER_ADDR_LEN);
  518         error = if_addmulti(ifp, (struct sockaddr *)&sdl, &rifma);
  519         if (error) {
  520                 printf("%s: ADDMULTI failed on %s\n", __func__, lgp->lp_ifname);
  521                 return (error);
  522         }
  523 
  524         lp = malloc(sizeof(struct lacp_port),
  525             M_DEVBUF, M_NOWAIT|M_ZERO);
  526         if (lp == NULL)
  527                 return (ENOMEM);
  528 
  529         LACP_LOCK(lsc);
  530         lgp->lp_psc = (caddr_t)lp;
  531         lp->lp_ifp = ifp;
  532         lp->lp_lagg = lgp;
  533         lp->lp_lsc = lsc;
  534         lp->lp_ifma = rifma;
  535 
  536         LIST_INSERT_HEAD(&lsc->lsc_ports, lp, lp_next);
  537 
  538         lacp_fill_actorinfo(lp, &lp->lp_actor);
  539         lacp_fill_markerinfo(lp, &lp->lp_marker);
  540         lp->lp_state =
  541             (active ? LACP_STATE_ACTIVITY : 0) |
  542             (fast ? LACP_STATE_TIMEOUT : 0);
  543         lp->lp_aggregator = NULL;
  544         lacp_sm_rx_set_expired(lp);
  545         LACP_UNLOCK(lsc);
  546         lacp_linkstate(lgp);
  547 
  548         return (0);
  549 }
  550 
  551 void
  552 lacp_port_destroy(struct lagg_port *lgp)
  553 {
  554         struct lacp_port *lp = LACP_PORT(lgp);
  555         struct lacp_softc *lsc = lp->lp_lsc;
  556         int i;
  557 
  558         LACP_LOCK(lsc);
  559         for (i = 0; i < LACP_NTIMER; i++) {
  560                 LACP_TIMER_DISARM(lp, i);
  561         }
  562 
  563         lacp_disable_collecting(lp);
  564         lacp_disable_distributing(lp);
  565         lacp_unselect(lp);
  566 
  567         /* The address may have already been removed by if_purgemaddrs() */
  568         if (!lgp->lp_detaching)
  569                 if_delmulti_ifma(lp->lp_ifma);
  570 
  571         LIST_REMOVE(lp, lp_next);
  572         LACP_UNLOCK(lsc);
  573         free(lp, M_DEVBUF);
  574 }
  575 
  576 void
  577 lacp_req(struct lagg_softc *sc, caddr_t data)
  578 {
  579         struct lacp_opreq *req = (struct lacp_opreq *)data;
  580         struct lacp_softc *lsc = LACP_SOFTC(sc);
  581         struct lacp_aggregator *la = lsc->lsc_active_aggregator;
  582 
  583         LACP_LOCK(lsc);
  584         bzero(req, sizeof(struct lacp_opreq));
  585         if (la != NULL) {
  586                 req->actor_prio = ntohs(la->la_actor.lip_systemid.lsi_prio);
  587                 memcpy(&req->actor_mac, &la->la_actor.lip_systemid.lsi_mac,
  588                     ETHER_ADDR_LEN);
  589                 req->actor_key = ntohs(la->la_actor.lip_key);
  590                 req->actor_portprio = ntohs(la->la_actor.lip_portid.lpi_prio);
  591                 req->actor_portno = ntohs(la->la_actor.lip_portid.lpi_portno);
  592                 req->actor_state = la->la_actor.lip_state;
  593 
  594                 req->partner_prio = ntohs(la->la_partner.lip_systemid.lsi_prio);
  595                 memcpy(&req->partner_mac, &la->la_partner.lip_systemid.lsi_mac,
  596                     ETHER_ADDR_LEN);
  597                 req->partner_key = ntohs(la->la_partner.lip_key);
  598                 req->partner_portprio = ntohs(la->la_partner.lip_portid.lpi_prio);
  599                 req->partner_portno = ntohs(la->la_partner.lip_portid.lpi_portno);
  600                 req->partner_state = la->la_partner.lip_state;
  601         }
  602         LACP_UNLOCK(lsc);
  603 }
  604 
  605 void
  606 lacp_portreq(struct lagg_port *lgp, caddr_t data)
  607 {
  608         struct lacp_opreq *req = (struct lacp_opreq *)data;
  609         struct lacp_port *lp = LACP_PORT(lgp);
  610         struct lacp_softc *lsc = lp->lp_lsc;
  611 
  612         LACP_LOCK(lsc);
  613         req->actor_prio = ntohs(lp->lp_actor.lip_systemid.lsi_prio);
  614         memcpy(&req->actor_mac, &lp->lp_actor.lip_systemid.lsi_mac,
  615             ETHER_ADDR_LEN);
  616         req->actor_key = ntohs(lp->lp_actor.lip_key);
  617         req->actor_portprio = ntohs(lp->lp_actor.lip_portid.lpi_prio);
  618         req->actor_portno = ntohs(lp->lp_actor.lip_portid.lpi_portno);
  619         req->actor_state = lp->lp_actor.lip_state;
  620 
  621         req->partner_prio = ntohs(lp->lp_partner.lip_systemid.lsi_prio);
  622         memcpy(&req->partner_mac, &lp->lp_partner.lip_systemid.lsi_mac,
  623             ETHER_ADDR_LEN);
  624         req->partner_key = ntohs(lp->lp_partner.lip_key);
  625         req->partner_portprio = ntohs(lp->lp_partner.lip_portid.lpi_prio);
  626         req->partner_portno = ntohs(lp->lp_partner.lip_portid.lpi_portno);
  627         req->partner_state = lp->lp_partner.lip_state;
  628         LACP_UNLOCK(lsc);
  629 }
  630 
  631 static void
  632 lacp_disable_collecting(struct lacp_port *lp)
  633 {
  634         LACP_DPRINTF((lp, "collecting disabled\n"));
  635         lp->lp_state &= ~LACP_STATE_COLLECTING;
  636 }
  637 
  638 static void
  639 lacp_enable_collecting(struct lacp_port *lp)
  640 {
  641         LACP_DPRINTF((lp, "collecting enabled\n"));
  642         lp->lp_state |= LACP_STATE_COLLECTING;
  643 }
  644 
  645 static void
  646 lacp_disable_distributing(struct lacp_port *lp)
  647 {
  648         struct lacp_aggregator *la = lp->lp_aggregator;
  649         struct lacp_softc *lsc = lp->lp_lsc;
  650 #if defined(LACP_DEBUG)
  651         char buf[LACP_LAGIDSTR_MAX+1];
  652 #endif /* defined(LACP_DEBUG) */
  653 
  654         LACP_LOCK_ASSERT(lsc);
  655 
  656         if (la == NULL || (lp->lp_state & LACP_STATE_DISTRIBUTING) == 0) {
  657                 return;
  658         }
  659 
  660         KASSERT(!TAILQ_EMPTY(&la->la_ports), ("no aggregator ports"));
  661         KASSERT(la->la_nports > 0, ("nports invalid (%d)", la->la_nports));
  662         KASSERT(la->la_refcnt >= la->la_nports, ("aggregator refcnt invalid"));
  663 
  664         LACP_DPRINTF((lp, "disable distributing on aggregator %s, "
  665             "nports %d -> %d\n",
  666             lacp_format_lagid_aggregator(la, buf, sizeof(buf)),
  667             la->la_nports, la->la_nports - 1));
  668 
  669         TAILQ_REMOVE(&la->la_ports, lp, lp_dist_q);
  670         la->la_nports--;
  671 
  672         if (lsc->lsc_active_aggregator == la) {
  673                 lacp_suppress_distributing(lsc, la);
  674                 lacp_select_active_aggregator(lsc);
  675                 /* regenerate the port map, the active aggregator has changed */
  676                 lacp_update_portmap(lsc);
  677         }
  678 
  679         lp->lp_state &= ~LACP_STATE_DISTRIBUTING;
  680 }
  681 
  682 static void
  683 lacp_enable_distributing(struct lacp_port *lp)
  684 {
  685         struct lacp_aggregator *la = lp->lp_aggregator;
  686         struct lacp_softc *lsc = lp->lp_lsc;
  687 #if defined(LACP_DEBUG)
  688         char buf[LACP_LAGIDSTR_MAX+1];
  689 #endif /* defined(LACP_DEBUG) */
  690 
  691         LACP_LOCK_ASSERT(lsc);
  692 
  693         if ((lp->lp_state & LACP_STATE_DISTRIBUTING) != 0) {
  694                 return;
  695         }
  696 
  697         LACP_DPRINTF((lp, "enable distributing on aggregator %s, "
  698             "nports %d -> %d\n",
  699             lacp_format_lagid_aggregator(la, buf, sizeof(buf)),
  700             la->la_nports, la->la_nports + 1));
  701 
  702         KASSERT(la->la_refcnt > la->la_nports, ("aggregator refcnt invalid"));
  703         TAILQ_INSERT_HEAD(&la->la_ports, lp, lp_dist_q);
  704         la->la_nports++;
  705 
  706         lp->lp_state |= LACP_STATE_DISTRIBUTING;
  707 
  708         if (lsc->lsc_active_aggregator == la) {
  709                 lacp_suppress_distributing(lsc, la);
  710                 lacp_update_portmap(lsc);
  711         } else
  712                 /* try to become the active aggregator */
  713                 lacp_select_active_aggregator(lsc);
  714 }
  715 
  716 static void
  717 lacp_transit_expire(void *vp)
  718 {
  719         struct lacp_softc *lsc = vp;
  720 
  721         LACP_LOCK_ASSERT(lsc);
  722 
  723         LACP_DPRINTF((NULL, "%s\n", __func__));
  724         lsc->lsc_suppress_distributing = FALSE;
  725 }
  726 
  727 int
  728 lacp_attach(struct lagg_softc *sc)
  729 {
  730         struct lacp_softc *lsc;
  731 
  732         lsc = malloc(sizeof(struct lacp_softc),
  733             M_DEVBUF, M_NOWAIT|M_ZERO);
  734         if (lsc == NULL)
  735                 return (ENOMEM);
  736 
  737         sc->sc_psc = (caddr_t)lsc;
  738         lsc->lsc_softc = sc;
  739 
  740         lsc->lsc_hashkey = arc4random();
  741         lsc->lsc_active_aggregator = NULL;
  742         LACP_LOCK_INIT(lsc);
  743         TAILQ_INIT(&lsc->lsc_aggregators);
  744         LIST_INIT(&lsc->lsc_ports);
  745 
  746         callout_init_mtx(&lsc->lsc_transit_callout, &lsc->lsc_mtx, 0);
  747         callout_init_mtx(&lsc->lsc_callout, &lsc->lsc_mtx, 0);
  748 
  749         /* if the lagg is already up then do the same */
  750         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
  751                 lacp_init(sc);
  752 
  753         return (0);
  754 }
  755 
  756 int
  757 lacp_detach(struct lagg_softc *sc)
  758 {
  759         struct lacp_softc *lsc = LACP_SOFTC(sc);
  760 
  761         KASSERT(TAILQ_EMPTY(&lsc->lsc_aggregators),
  762             ("aggregators still active"));
  763         KASSERT(lsc->lsc_active_aggregator == NULL,
  764             ("aggregator still attached"));
  765 
  766         sc->sc_psc = NULL;
  767         callout_drain(&lsc->lsc_transit_callout);
  768         callout_drain(&lsc->lsc_callout);
  769 
  770         LACP_LOCK_DESTROY(lsc);
  771         free(lsc, M_DEVBUF);
  772         return (0);
  773 }
  774 
  775 void
  776 lacp_init(struct lagg_softc *sc)
  777 {
  778         struct lacp_softc *lsc = LACP_SOFTC(sc);
  779 
  780         LACP_LOCK(lsc);
  781         callout_reset(&lsc->lsc_callout, hz, lacp_tick, lsc);
  782         LACP_UNLOCK(lsc);
  783 }
  784 
  785 void
  786 lacp_stop(struct lagg_softc *sc)
  787 {
  788         struct lacp_softc *lsc = LACP_SOFTC(sc);
  789 
  790         LACP_LOCK(lsc);
  791         callout_stop(&lsc->lsc_transit_callout);
  792         callout_stop(&lsc->lsc_callout);
  793         LACP_UNLOCK(lsc);
  794 }
  795 
  796 struct lagg_port *
  797 lacp_select_tx_port(struct lagg_softc *sc, struct mbuf *m)
  798 {
  799         struct lacp_softc *lsc = LACP_SOFTC(sc);
  800         struct lacp_portmap *pm;
  801         struct lacp_port *lp;
  802         uint32_t hash;
  803 
  804         if (__predict_false(lsc->lsc_suppress_distributing)) {
  805                 LACP_DPRINTF((NULL, "%s: waiting transit\n", __func__));
  806                 return (NULL);
  807         }
  808 
  809         pm = &lsc->lsc_pmap[lsc->lsc_activemap];
  810         if (pm->pm_count == 0) {
  811                 LACP_DPRINTF((NULL, "%s: no active aggregator\n", __func__));
  812                 return (NULL);
  813         }
  814 
  815         if (sc->use_flowid && (m->m_flags & M_FLOWID))
  816                 hash = m->m_pkthdr.flowid;
  817         else
  818                 hash = lagg_hashmbuf(sc, m, lsc->lsc_hashkey);
  819         hash %= pm->pm_count;
  820         lp = pm->pm_map[hash];
  821 
  822         KASSERT((lp->lp_state & LACP_STATE_DISTRIBUTING) != 0,
  823             ("aggregated port is not distributing"));
  824 
  825         return (lp->lp_lagg);
  826 }
  827 /*
  828  * lacp_suppress_distributing: drop transmit packets for a while
  829  * to preserve packet ordering.
  830  */
  831 
  832 static void
  833 lacp_suppress_distributing(struct lacp_softc *lsc, struct lacp_aggregator *la)
  834 {
  835         struct lacp_port *lp;
  836 
  837         if (lsc->lsc_active_aggregator != la) {
  838                 return;
  839         }
  840 
  841         LACP_DPRINTF((NULL, "%s\n", __func__));
  842         lsc->lsc_suppress_distributing = TRUE;
  843 
  844         /* send a marker frame down each port to verify the queues are empty */
  845         LIST_FOREACH(lp, &lsc->lsc_ports, lp_next) {
  846                 lp->lp_flags |= LACP_PORT_MARK;
  847                 lacp_xmit_marker(lp);
  848         }
  849 
  850         /* set a timeout for the marker frames */
  851         callout_reset(&lsc->lsc_transit_callout,
  852             LACP_TRANSIT_DELAY * hz / 1000, lacp_transit_expire, lsc);
  853 }
  854 
  855 static int
  856 lacp_compare_peerinfo(const struct lacp_peerinfo *a,
  857     const struct lacp_peerinfo *b)
  858 {
  859         return (memcmp(a, b, offsetof(struct lacp_peerinfo, lip_state)));
  860 }
  861 
  862 static int
  863 lacp_compare_systemid(const struct lacp_systemid *a,
  864     const struct lacp_systemid *b)
  865 {
  866         return (memcmp(a, b, sizeof(*a)));
  867 }
  868 
  869 #if 0   /* unused */
  870 static int
  871 lacp_compare_portid(const struct lacp_portid *a,
  872     const struct lacp_portid *b)
  873 {
  874         return (memcmp(a, b, sizeof(*a)));
  875 }
  876 #endif
  877 
  878 static uint64_t
  879 lacp_aggregator_bandwidth(struct lacp_aggregator *la)
  880 {
  881         struct lacp_port *lp;
  882         uint64_t speed;
  883 
  884         lp = TAILQ_FIRST(&la->la_ports);
  885         if (lp == NULL) {
  886                 return (0);
  887         }
  888 
  889         speed = ifmedia_baudrate(lp->lp_media);
  890         speed *= la->la_nports;
  891         if (speed == 0) {
  892                 LACP_DPRINTF((lp, "speed 0? media=0x%x nports=%d\n",
  893                     lp->lp_media, la->la_nports));
  894         }
  895 
  896         return (speed);
  897 }
  898 
  899 /*
  900  * lacp_select_active_aggregator: select an aggregator to be used to transmit
  901  * packets from lagg(4) interface.
  902  */
  903 
  904 static void
  905 lacp_select_active_aggregator(struct lacp_softc *lsc)
  906 {
  907         struct lagg_softc *sc = lsc->lsc_softc;
  908         struct lacp_aggregator *la;
  909         struct lacp_aggregator *best_la = NULL;
  910         uint64_t best_speed = 0;
  911 #if defined(LACP_DEBUG)
  912         char buf[LACP_LAGIDSTR_MAX+1];
  913 #endif /* defined(LACP_DEBUG) */
  914 
  915         LACP_DPRINTF((NULL, "%s:\n", __func__));
  916 
  917         TAILQ_FOREACH(la, &lsc->lsc_aggregators, la_q) {
  918                 uint64_t speed;
  919 
  920                 if (la->la_nports == 0) {
  921                         continue;
  922                 }
  923 
  924                 speed = lacp_aggregator_bandwidth(la);
  925                 LACP_DPRINTF((NULL, "%s, speed=%jd, nports=%d\n",
  926                     lacp_format_lagid_aggregator(la, buf, sizeof(buf)),
  927                     speed, la->la_nports));
  928 
  929                 /* This aggregator is chosen if
  930                  *      the partner has a better system priority
  931                  *  or, the total aggregated speed is higher
  932                  *  or, it is already the chosen aggregator
  933                  */
  934                 if ((best_la != NULL && LACP_SYS_PRI(la->la_partner) <
  935                      LACP_SYS_PRI(best_la->la_partner)) ||
  936                     speed > best_speed ||
  937                     (speed == best_speed &&
  938                     la == lsc->lsc_active_aggregator)) {
  939                         best_la = la;
  940                         best_speed = speed;
  941                 }
  942         }
  943 
  944         KASSERT(best_la == NULL || best_la->la_nports > 0,
  945             ("invalid aggregator refcnt"));
  946         KASSERT(best_la == NULL || !TAILQ_EMPTY(&best_la->la_ports),
  947             ("invalid aggregator list"));
  948 
  949 #if defined(LACP_DEBUG)
  950         if (lsc->lsc_active_aggregator != best_la) {
  951                 LACP_DPRINTF((NULL, "active aggregator changed\n"));
  952                 LACP_DPRINTF((NULL, "old %s\n",
  953                     lacp_format_lagid_aggregator(lsc->lsc_active_aggregator,
  954                     buf, sizeof(buf))));
  955         } else {
  956                 LACP_DPRINTF((NULL, "active aggregator not changed\n"));
  957         }
  958         LACP_DPRINTF((NULL, "new %s\n",
  959             lacp_format_lagid_aggregator(best_la, buf, sizeof(buf))));
  960 #endif /* defined(LACP_DEBUG) */
  961 
  962         if (lsc->lsc_active_aggregator != best_la) {
  963                 sc->sc_ifp->if_baudrate = best_speed;
  964                 lsc->lsc_active_aggregator = best_la;
  965                 lacp_update_portmap(lsc);
  966                 if (best_la) {
  967                         lacp_suppress_distributing(lsc, best_la);
  968                 }
  969         }
  970 }
  971 
  972 /*
  973  * Updated the inactive portmap array with the new list of ports and
  974  * make it live.
  975  */
  976 static void
  977 lacp_update_portmap(struct lacp_softc *lsc)
  978 {
  979         struct lacp_aggregator *la;
  980         struct lacp_portmap *p;
  981         struct lacp_port *lp;
  982         u_int newmap;
  983         int i;
  984 
  985         newmap = lsc->lsc_activemap == 0 ? 1 : 0;
  986         p = &lsc->lsc_pmap[newmap];
  987         la = lsc->lsc_active_aggregator;
  988         bzero(p, sizeof(struct lacp_portmap));
  989 
  990         if (la != NULL && la->la_nports > 0) {
  991                 p->pm_count = la->la_nports;
  992                 i = 0;
  993                 TAILQ_FOREACH(lp, &la->la_ports, lp_dist_q)
  994                         p->pm_map[i++] = lp;
  995                 KASSERT(i == p->pm_count, ("Invalid port count"));
  996         }
  997 
  998         /* switch the active portmap over */
  999         atomic_store_rel_int(&lsc->lsc_activemap, newmap);
 1000         LACP_DPRINTF((NULL, "Set table %d with %d ports\n",
 1001                     lsc->lsc_activemap,
 1002                     lsc->lsc_pmap[lsc->lsc_activemap].pm_count));
 1003 }
 1004 
 1005 static uint16_t
 1006 lacp_compose_key(struct lacp_port *lp)
 1007 {
 1008         struct lagg_port *lgp = lp->lp_lagg;
 1009         struct lagg_softc *sc = lgp->lp_softc;
 1010         u_int media = lp->lp_media;
 1011         uint16_t key;
 1012 
 1013         if ((lp->lp_state & LACP_STATE_AGGREGATION) == 0) {
 1014 
 1015                 /*
 1016                  * non-aggregatable links should have unique keys.
 1017                  *
 1018                  * XXX this isn't really unique as if_index is 16 bit.
 1019                  */
 1020 
 1021                 /* bit 0..14:   (some bits of) if_index of this port */
 1022                 key = lp->lp_ifp->if_index;
 1023                 /* bit 15:      1 */
 1024                 key |= 0x8000;
 1025         } else {
 1026                 u_int subtype = IFM_SUBTYPE(media);
 1027 
 1028                 KASSERT(IFM_TYPE(media) == IFM_ETHER, ("invalid media type"));
 1029                 KASSERT((media & IFM_FDX) != 0, ("aggregating HDX interface"));
 1030 
 1031                 /* bit 0..4:    IFM_SUBTYPE modulo speed */
 1032                 switch (subtype) {
 1033                 case IFM_10_T:
 1034                 case IFM_10_2:
 1035                 case IFM_10_5:
 1036                 case IFM_10_STP:
 1037                 case IFM_10_FL:
 1038                         key = IFM_10_T;
 1039                         break;
 1040                 case IFM_100_TX:
 1041                 case IFM_100_FX:
 1042                 case IFM_100_T4:
 1043                 case IFM_100_VG:
 1044                 case IFM_100_T2:
 1045                         key = IFM_100_TX;
 1046                         break;
 1047                 case IFM_1000_SX:
 1048                 case IFM_1000_LX:
 1049                 case IFM_1000_CX:
 1050                 case IFM_1000_T:
 1051                         key = IFM_1000_SX;
 1052                         break;
 1053                 case IFM_10G_LR:
 1054                 case IFM_10G_SR:
 1055                 case IFM_10G_CX4:
 1056                 case IFM_10G_TWINAX:
 1057                 case IFM_10G_TWINAX_LONG:
 1058                 case IFM_10G_LRM:
 1059                 case IFM_10G_T:
 1060                         key = IFM_10G_LR;
 1061                         break;
 1062                 default:
 1063                         key = subtype;
 1064                 }
 1065                 /* bit 5..14:   (some bits of) if_index of lagg device */
 1066                 key |= 0x7fe0 & ((sc->sc_ifp->if_index) << 5);
 1067                 /* bit 15:      0 */
 1068         }
 1069         return (htons(key));
 1070 }
 1071 
 1072 static void
 1073 lacp_aggregator_addref(struct lacp_softc *lsc, struct lacp_aggregator *la)
 1074 {
 1075 #if defined(LACP_DEBUG)
 1076         char buf[LACP_LAGIDSTR_MAX+1];
 1077 #endif
 1078 
 1079         LACP_DPRINTF((NULL, "%s: lagid=%s, refcnt %d -> %d\n",
 1080             __func__,
 1081             lacp_format_lagid(&la->la_actor, &la->la_partner,
 1082             buf, sizeof(buf)),
 1083             la->la_refcnt, la->la_refcnt + 1));
 1084 
 1085         KASSERT(la->la_refcnt > 0, ("refcount <= 0"));
 1086         la->la_refcnt++;
 1087         KASSERT(la->la_refcnt > la->la_nports, ("invalid refcount"));
 1088 }
 1089 
 1090 static void
 1091 lacp_aggregator_delref(struct lacp_softc *lsc, struct lacp_aggregator *la)
 1092 {
 1093 #if defined(LACP_DEBUG)
 1094         char buf[LACP_LAGIDSTR_MAX+1];
 1095 #endif
 1096 
 1097         LACP_DPRINTF((NULL, "%s: lagid=%s, refcnt %d -> %d\n",
 1098             __func__,
 1099             lacp_format_lagid(&la->la_actor, &la->la_partner,
 1100             buf, sizeof(buf)),
 1101             la->la_refcnt, la->la_refcnt - 1));
 1102 
 1103         KASSERT(la->la_refcnt > la->la_nports, ("invalid refcnt"));
 1104         la->la_refcnt--;
 1105         if (la->la_refcnt > 0) {
 1106                 return;
 1107         }
 1108 
 1109         KASSERT(la->la_refcnt == 0, ("refcount not zero"));
 1110         KASSERT(lsc->lsc_active_aggregator != la, ("aggregator active"));
 1111 
 1112         TAILQ_REMOVE(&lsc->lsc_aggregators, la, la_q);
 1113 
 1114         free(la, M_DEVBUF);
 1115 }
 1116 
 1117 /*
 1118  * lacp_aggregator_get: allocate an aggregator.
 1119  */
 1120 
 1121 static struct lacp_aggregator *
 1122 lacp_aggregator_get(struct lacp_softc *lsc, struct lacp_port *lp)
 1123 {
 1124         struct lacp_aggregator *la;
 1125 
 1126         la = malloc(sizeof(*la), M_DEVBUF, M_NOWAIT);
 1127         if (la) {
 1128                 la->la_refcnt = 1;
 1129                 la->la_nports = 0;
 1130                 TAILQ_INIT(&la->la_ports);
 1131                 la->la_pending = 0;
 1132                 TAILQ_INSERT_TAIL(&lsc->lsc_aggregators, la, la_q);
 1133         }
 1134 
 1135         return (la);
 1136 }
 1137 
 1138 /*
 1139  * lacp_fill_aggregator_id: setup a newly allocated aggregator from a port.
 1140  */
 1141 
 1142 static void
 1143 lacp_fill_aggregator_id(struct lacp_aggregator *la, const struct lacp_port *lp)
 1144 {
 1145         lacp_fill_aggregator_id_peer(&la->la_partner, &lp->lp_partner);
 1146         lacp_fill_aggregator_id_peer(&la->la_actor, &lp->lp_actor);
 1147 
 1148         la->la_actor.lip_state = lp->lp_state & LACP_STATE_AGGREGATION;
 1149 }
 1150 
 1151 static void
 1152 lacp_fill_aggregator_id_peer(struct lacp_peerinfo *lpi_aggr,
 1153     const struct lacp_peerinfo *lpi_port)
 1154 {
 1155         memset(lpi_aggr, 0, sizeof(*lpi_aggr));
 1156         lpi_aggr->lip_systemid = lpi_port->lip_systemid;
 1157         lpi_aggr->lip_key = lpi_port->lip_key;
 1158 }
 1159 
 1160 /*
 1161  * lacp_aggregator_is_compatible: check if a port can join to an aggregator.
 1162  */
 1163 
 1164 static int
 1165 lacp_aggregator_is_compatible(const struct lacp_aggregator *la,
 1166     const struct lacp_port *lp)
 1167 {
 1168         if (!(lp->lp_state & LACP_STATE_AGGREGATION) ||
 1169             !(lp->lp_partner.lip_state & LACP_STATE_AGGREGATION)) {
 1170                 return (0);
 1171         }
 1172 
 1173         if (!(la->la_actor.lip_state & LACP_STATE_AGGREGATION)) {
 1174                 return (0);
 1175         }
 1176 
 1177         if (!lacp_peerinfo_is_compatible(&la->la_partner, &lp->lp_partner)) {
 1178                 return (0);
 1179         }
 1180 
 1181         if (!lacp_peerinfo_is_compatible(&la->la_actor, &lp->lp_actor)) {
 1182                 return (0);
 1183         }
 1184 
 1185         return (1);
 1186 }
 1187 
 1188 static int
 1189 lacp_peerinfo_is_compatible(const struct lacp_peerinfo *a,
 1190     const struct lacp_peerinfo *b)
 1191 {
 1192         if (memcmp(&a->lip_systemid, &b->lip_systemid,
 1193             sizeof(a->lip_systemid))) {
 1194                 return (0);
 1195         }
 1196 
 1197         if (memcmp(&a->lip_key, &b->lip_key, sizeof(a->lip_key))) {
 1198                 return (0);
 1199         }
 1200 
 1201         return (1);
 1202 }
 1203 
 1204 static void
 1205 lacp_port_enable(struct lacp_port *lp)
 1206 {
 1207         lp->lp_state |= LACP_STATE_AGGREGATION;
 1208 }
 1209 
 1210 static void
 1211 lacp_port_disable(struct lacp_port *lp)
 1212 {
 1213         lacp_set_mux(lp, LACP_MUX_DETACHED);
 1214 
 1215         lp->lp_state &= ~LACP_STATE_AGGREGATION;
 1216         lp->lp_selected = LACP_UNSELECTED;
 1217         lacp_sm_rx_record_default(lp);
 1218         lp->lp_partner.lip_state &= ~LACP_STATE_AGGREGATION;
 1219         lp->lp_state &= ~LACP_STATE_EXPIRED;
 1220 }
 1221 
 1222 /*
 1223  * lacp_select: select an aggregator.  create one if necessary.
 1224  */
 1225 static void
 1226 lacp_select(struct lacp_port *lp)
 1227 {
 1228         struct lacp_softc *lsc = lp->lp_lsc;
 1229         struct lacp_aggregator *la;
 1230 #if defined(LACP_DEBUG)
 1231         char buf[LACP_LAGIDSTR_MAX+1];
 1232 #endif
 1233 
 1234         if (lp->lp_aggregator) {
 1235                 return;
 1236         }
 1237 
 1238         KASSERT(!LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE),
 1239             ("timer_wait_while still active"));
 1240 
 1241         LACP_DPRINTF((lp, "port lagid=%s\n",
 1242             lacp_format_lagid(&lp->lp_actor, &lp->lp_partner,
 1243             buf, sizeof(buf))));
 1244 
 1245         TAILQ_FOREACH(la, &lsc->lsc_aggregators, la_q) {
 1246                 if (lacp_aggregator_is_compatible(la, lp)) {
 1247                         break;
 1248                 }
 1249         }
 1250 
 1251         if (la == NULL) {
 1252                 la = lacp_aggregator_get(lsc, lp);
 1253                 if (la == NULL) {
 1254                         LACP_DPRINTF((lp, "aggregator creation failed\n"));
 1255 
 1256                         /*
 1257                          * will retry on the next tick.
 1258                          */
 1259 
 1260                         return;
 1261                 }
 1262                 lacp_fill_aggregator_id(la, lp);
 1263                 LACP_DPRINTF((lp, "aggregator created\n"));
 1264         } else {
 1265                 LACP_DPRINTF((lp, "compatible aggregator found\n"));
 1266                 if (la->la_refcnt == LACP_MAX_PORTS)
 1267                         return;
 1268                 lacp_aggregator_addref(lsc, la);
 1269         }
 1270 
 1271         LACP_DPRINTF((lp, "aggregator lagid=%s\n",
 1272             lacp_format_lagid(&la->la_actor, &la->la_partner,
 1273             buf, sizeof(buf))));
 1274 
 1275         lp->lp_aggregator = la;
 1276         lp->lp_selected = LACP_SELECTED;
 1277 }
 1278 
 1279 /*
 1280  * lacp_unselect: finish unselect/detach process.
 1281  */
 1282 
 1283 static void
 1284 lacp_unselect(struct lacp_port *lp)
 1285 {
 1286         struct lacp_softc *lsc = lp->lp_lsc;
 1287         struct lacp_aggregator *la = lp->lp_aggregator;
 1288 
 1289         KASSERT(!LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE),
 1290             ("timer_wait_while still active"));
 1291 
 1292         if (la == NULL) {
 1293                 return;
 1294         }
 1295 
 1296         lp->lp_aggregator = NULL;
 1297         lacp_aggregator_delref(lsc, la);
 1298 }
 1299 
 1300 /* mux machine */
 1301 
 1302 static void
 1303 lacp_sm_mux(struct lacp_port *lp)
 1304 {
 1305         enum lacp_mux_state new_state;
 1306         boolean_t p_sync =
 1307                     (lp->lp_partner.lip_state & LACP_STATE_SYNC) != 0;
 1308         boolean_t p_collecting =
 1309             (lp->lp_partner.lip_state & LACP_STATE_COLLECTING) != 0;
 1310         enum lacp_selected selected = lp->lp_selected;
 1311         struct lacp_aggregator *la;
 1312 
 1313         /* LACP_DPRINTF((lp, "%s: state %d\n", __func__, lp->lp_mux_state)); */
 1314 
 1315 re_eval:
 1316         la = lp->lp_aggregator;
 1317         KASSERT(lp->lp_mux_state == LACP_MUX_DETACHED || la != NULL,
 1318             ("MUX not detached"));
 1319         new_state = lp->lp_mux_state;
 1320         switch (lp->lp_mux_state) {
 1321         case LACP_MUX_DETACHED:
 1322                 if (selected != LACP_UNSELECTED) {
 1323                         new_state = LACP_MUX_WAITING;
 1324                 }
 1325                 break;
 1326         case LACP_MUX_WAITING:
 1327                 KASSERT(la->la_pending > 0 ||
 1328                     !LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE),
 1329                     ("timer_wait_while still active"));
 1330                 if (selected == LACP_SELECTED && la->la_pending == 0) {
 1331                         new_state = LACP_MUX_ATTACHED;
 1332                 } else if (selected == LACP_UNSELECTED) {
 1333                         new_state = LACP_MUX_DETACHED;
 1334                 }
 1335                 break;
 1336         case LACP_MUX_ATTACHED:
 1337                 if (selected == LACP_SELECTED && p_sync) {
 1338                         new_state = LACP_MUX_COLLECTING;
 1339                 } else if (selected != LACP_SELECTED) {
 1340                         new_state = LACP_MUX_DETACHED;
 1341                 }
 1342                 break;
 1343         case LACP_MUX_COLLECTING:
 1344                 if (selected == LACP_SELECTED && p_sync && p_collecting) {
 1345                         new_state = LACP_MUX_DISTRIBUTING;
 1346                 } else if (selected != LACP_SELECTED || !p_sync) {
 1347                         new_state = LACP_MUX_ATTACHED;
 1348                 }
 1349                 break;
 1350         case LACP_MUX_DISTRIBUTING:
 1351                 if (selected != LACP_SELECTED || !p_sync || !p_collecting) {
 1352                         new_state = LACP_MUX_COLLECTING;
 1353                 }
 1354                 break;
 1355         default:
 1356                 panic("%s: unknown state", __func__);
 1357         }
 1358 
 1359         if (lp->lp_mux_state == new_state) {
 1360                 return;
 1361         }
 1362 
 1363         lacp_set_mux(lp, new_state);
 1364         goto re_eval;
 1365 }
 1366 
 1367 static void
 1368 lacp_set_mux(struct lacp_port *lp, enum lacp_mux_state new_state)
 1369 {
 1370         struct lacp_aggregator *la = lp->lp_aggregator;
 1371 
 1372         if (lp->lp_mux_state == new_state) {
 1373                 return;
 1374         }
 1375 
 1376         switch (new_state) {
 1377         case LACP_MUX_DETACHED:
 1378                 lp->lp_state &= ~LACP_STATE_SYNC;
 1379                 lacp_disable_distributing(lp);
 1380                 lacp_disable_collecting(lp);
 1381                 lacp_sm_assert_ntt(lp);
 1382                 /* cancel timer */
 1383                 if (LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE)) {
 1384                         KASSERT(la->la_pending > 0,
 1385                             ("timer_wait_while not active"));
 1386                         la->la_pending--;
 1387                 }
 1388                 LACP_TIMER_DISARM(lp, LACP_TIMER_WAIT_WHILE);
 1389                 lacp_unselect(lp);
 1390                 break;
 1391         case LACP_MUX_WAITING:
 1392                 LACP_TIMER_ARM(lp, LACP_TIMER_WAIT_WHILE,
 1393                     LACP_AGGREGATE_WAIT_TIME);
 1394                 la->la_pending++;
 1395                 break;
 1396         case LACP_MUX_ATTACHED:
 1397                 lp->lp_state |= LACP_STATE_SYNC;
 1398                 lacp_disable_collecting(lp);
 1399                 lacp_sm_assert_ntt(lp);
 1400                 break;
 1401         case LACP_MUX_COLLECTING:
 1402                 lacp_enable_collecting(lp);
 1403                 lacp_disable_distributing(lp);
 1404                 lacp_sm_assert_ntt(lp);
 1405                 break;
 1406         case LACP_MUX_DISTRIBUTING:
 1407                 lacp_enable_distributing(lp);
 1408                 break;
 1409         default:
 1410                 panic("%s: unknown state", __func__);
 1411         }
 1412 
 1413         LACP_DPRINTF((lp, "mux_state %d -> %d\n", lp->lp_mux_state, new_state));
 1414 
 1415         lp->lp_mux_state = new_state;
 1416 }
 1417 
 1418 static void
 1419 lacp_sm_mux_timer(struct lacp_port *lp)
 1420 {
 1421         struct lacp_aggregator *la = lp->lp_aggregator;
 1422 #if defined(LACP_DEBUG)
 1423         char buf[LACP_LAGIDSTR_MAX+1];
 1424 #endif
 1425 
 1426         KASSERT(la->la_pending > 0, ("no pending event"));
 1427 
 1428         LACP_DPRINTF((lp, "%s: aggregator %s, pending %d -> %d\n", __func__,
 1429             lacp_format_lagid(&la->la_actor, &la->la_partner,
 1430             buf, sizeof(buf)),
 1431             la->la_pending, la->la_pending - 1));
 1432 
 1433         la->la_pending--;
 1434 }
 1435 
 1436 /* periodic transmit machine */
 1437 
 1438 static void
 1439 lacp_sm_ptx_update_timeout(struct lacp_port *lp, uint8_t oldpstate)
 1440 {
 1441         if (LACP_STATE_EQ(oldpstate, lp->lp_partner.lip_state,
 1442             LACP_STATE_TIMEOUT)) {
 1443                 return;
 1444         }
 1445 
 1446         LACP_DPRINTF((lp, "partner timeout changed\n"));
 1447 
 1448         /*
 1449          * FAST_PERIODIC -> SLOW_PERIODIC
 1450          * or
 1451          * SLOW_PERIODIC (-> PERIODIC_TX) -> FAST_PERIODIC
 1452          *
 1453          * let lacp_sm_ptx_tx_schedule to update timeout.
 1454          */
 1455 
 1456         LACP_TIMER_DISARM(lp, LACP_TIMER_PERIODIC);
 1457 
 1458         /*
 1459          * if timeout has been shortened, assert NTT.
 1460          */
 1461 
 1462         if ((lp->lp_partner.lip_state & LACP_STATE_TIMEOUT)) {
 1463                 lacp_sm_assert_ntt(lp);
 1464         }
 1465 }
 1466 
 1467 static void
 1468 lacp_sm_ptx_tx_schedule(struct lacp_port *lp)
 1469 {
 1470         int timeout;
 1471 
 1472         if (!(lp->lp_state & LACP_STATE_ACTIVITY) &&
 1473             !(lp->lp_partner.lip_state & LACP_STATE_ACTIVITY)) {
 1474 
 1475                 /*
 1476                  * NO_PERIODIC
 1477                  */
 1478 
 1479                 LACP_TIMER_DISARM(lp, LACP_TIMER_PERIODIC);
 1480                 return;
 1481         }
 1482 
 1483         if (LACP_TIMER_ISARMED(lp, LACP_TIMER_PERIODIC)) {
 1484                 return;
 1485         }
 1486 
 1487         timeout = (lp->lp_partner.lip_state & LACP_STATE_TIMEOUT) ?
 1488             LACP_FAST_PERIODIC_TIME : LACP_SLOW_PERIODIC_TIME;
 1489 
 1490         LACP_TIMER_ARM(lp, LACP_TIMER_PERIODIC, timeout);
 1491 }
 1492 
 1493 static void
 1494 lacp_sm_ptx_timer(struct lacp_port *lp)
 1495 {
 1496         lacp_sm_assert_ntt(lp);
 1497 }
 1498 
 1499 static void
 1500 lacp_sm_rx(struct lacp_port *lp, const struct lacpdu *du)
 1501 {
 1502         int timeout;
 1503 
 1504         /*
 1505          * check LACP_DISABLED first
 1506          */
 1507 
 1508         if (!(lp->lp_state & LACP_STATE_AGGREGATION)) {
 1509                 return;
 1510         }
 1511 
 1512         /*
 1513          * check loopback condition.
 1514          */
 1515 
 1516         if (!lacp_compare_systemid(&du->ldu_actor.lip_systemid,
 1517             &lp->lp_actor.lip_systemid)) {
 1518                 return;
 1519         }
 1520 
 1521         /*
 1522          * EXPIRED, DEFAULTED, CURRENT -> CURRENT
 1523          */
 1524 
 1525         lacp_sm_rx_update_selected(lp, du);
 1526         lacp_sm_rx_update_ntt(lp, du);
 1527         lacp_sm_rx_record_pdu(lp, du);
 1528 
 1529         timeout = (lp->lp_state & LACP_STATE_TIMEOUT) ?
 1530             LACP_SHORT_TIMEOUT_TIME : LACP_LONG_TIMEOUT_TIME;
 1531         LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, timeout);
 1532 
 1533         lp->lp_state &= ~LACP_STATE_EXPIRED;
 1534 
 1535         /*
 1536          * kick transmit machine without waiting the next tick.
 1537          */
 1538 
 1539         lacp_sm_tx(lp);
 1540 }
 1541 
 1542 static void
 1543 lacp_sm_rx_set_expired(struct lacp_port *lp)
 1544 {
 1545         lp->lp_partner.lip_state &= ~LACP_STATE_SYNC;
 1546         lp->lp_partner.lip_state |= LACP_STATE_TIMEOUT;
 1547         LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, LACP_SHORT_TIMEOUT_TIME);
 1548         lp->lp_state |= LACP_STATE_EXPIRED;
 1549 }
 1550 
 1551 static void
 1552 lacp_sm_rx_timer(struct lacp_port *lp)
 1553 {
 1554         if ((lp->lp_state & LACP_STATE_EXPIRED) == 0) {
 1555                 /* CURRENT -> EXPIRED */
 1556                 LACP_DPRINTF((lp, "%s: CURRENT -> EXPIRED\n", __func__));
 1557                 lacp_sm_rx_set_expired(lp);
 1558         } else {
 1559                 /* EXPIRED -> DEFAULTED */
 1560                 LACP_DPRINTF((lp, "%s: EXPIRED -> DEFAULTED\n", __func__));
 1561                 lacp_sm_rx_update_default_selected(lp);
 1562                 lacp_sm_rx_record_default(lp);
 1563                 lp->lp_state &= ~LACP_STATE_EXPIRED;
 1564         }
 1565 }
 1566 
 1567 static void
 1568 lacp_sm_rx_record_pdu(struct lacp_port *lp, const struct lacpdu *du)
 1569 {
 1570         boolean_t active;
 1571         uint8_t oldpstate;
 1572 #if defined(LACP_DEBUG)
 1573         char buf[LACP_STATESTR_MAX+1];
 1574 #endif
 1575 
 1576         /* LACP_DPRINTF((lp, "%s\n", __func__)); */
 1577 
 1578         oldpstate = lp->lp_partner.lip_state;
 1579 
 1580         active = (du->ldu_actor.lip_state & LACP_STATE_ACTIVITY)
 1581             || ((lp->lp_state & LACP_STATE_ACTIVITY) &&
 1582             (du->ldu_partner.lip_state & LACP_STATE_ACTIVITY));
 1583 
 1584         lp->lp_partner = du->ldu_actor;
 1585         if (active &&
 1586             ((LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state,
 1587             LACP_STATE_AGGREGATION) &&
 1588             !lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner))
 1589             || (du->ldu_partner.lip_state & LACP_STATE_AGGREGATION) == 0)) {
 1590                 /* XXX nothing? */
 1591         } else {
 1592                 lp->lp_partner.lip_state &= ~LACP_STATE_SYNC;
 1593         }
 1594 
 1595         lp->lp_state &= ~LACP_STATE_DEFAULTED;
 1596 
 1597         if (oldpstate != lp->lp_partner.lip_state) {
 1598                 LACP_DPRINTF((lp, "old pstate %s\n",
 1599                     lacp_format_state(oldpstate, buf, sizeof(buf))));
 1600                 LACP_DPRINTF((lp, "new pstate %s\n",
 1601                     lacp_format_state(lp->lp_partner.lip_state, buf,
 1602                     sizeof(buf))));
 1603         }
 1604 
 1605         lacp_sm_ptx_update_timeout(lp, oldpstate);
 1606 }
 1607 
 1608 static void
 1609 lacp_sm_rx_update_ntt(struct lacp_port *lp, const struct lacpdu *du)
 1610 {
 1611         /* LACP_DPRINTF((lp, "%s\n", __func__)); */
 1612 
 1613         if (lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner) ||
 1614             !LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state,
 1615             LACP_STATE_ACTIVITY | LACP_STATE_SYNC | LACP_STATE_AGGREGATION)) {
 1616                 LACP_DPRINTF((lp, "%s: assert ntt\n", __func__));
 1617                 lacp_sm_assert_ntt(lp);
 1618         }
 1619 }
 1620 
 1621 static void
 1622 lacp_sm_rx_record_default(struct lacp_port *lp)
 1623 {
 1624         uint8_t oldpstate;
 1625 
 1626         /* LACP_DPRINTF((lp, "%s\n", __func__)); */
 1627 
 1628         oldpstate = lp->lp_partner.lip_state;
 1629         lp->lp_partner = lacp_partner_admin;
 1630         lp->lp_state |= LACP_STATE_DEFAULTED;
 1631         lacp_sm_ptx_update_timeout(lp, oldpstate);
 1632 }
 1633 
 1634 static void
 1635 lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *lp,
 1636     const struct lacp_peerinfo *info)
 1637 {
 1638         /* LACP_DPRINTF((lp, "%s\n", __func__)); */
 1639 
 1640         if (lacp_compare_peerinfo(&lp->lp_partner, info) ||
 1641             !LACP_STATE_EQ(lp->lp_partner.lip_state, info->lip_state,
 1642             LACP_STATE_AGGREGATION)) {
 1643                 lp->lp_selected = LACP_UNSELECTED;
 1644                 /* mux machine will clean up lp->lp_aggregator */
 1645         }
 1646 }
 1647 
 1648 static void
 1649 lacp_sm_rx_update_selected(struct lacp_port *lp, const struct lacpdu *du)
 1650 {
 1651         /* LACP_DPRINTF((lp, "%s\n", __func__)); */
 1652 
 1653         lacp_sm_rx_update_selected_from_peerinfo(lp, &du->ldu_actor);
 1654 }
 1655 
 1656 static void
 1657 lacp_sm_rx_update_default_selected(struct lacp_port *lp)
 1658 {
 1659         /* LACP_DPRINTF((lp, "%s\n", __func__)); */
 1660 
 1661         lacp_sm_rx_update_selected_from_peerinfo(lp, &lacp_partner_admin);
 1662 }
 1663 
 1664 /* transmit machine */
 1665 
 1666 static void
 1667 lacp_sm_tx(struct lacp_port *lp)
 1668 {
 1669         int error;
 1670 
 1671         if (!(lp->lp_state & LACP_STATE_AGGREGATION)
 1672 #if 1
 1673             || (!(lp->lp_state & LACP_STATE_ACTIVITY)
 1674             && !(lp->lp_partner.lip_state & LACP_STATE_ACTIVITY))
 1675 #endif
 1676             ) {
 1677                 lp->lp_flags &= ~LACP_PORT_NTT;
 1678         }
 1679 
 1680         if (!(lp->lp_flags & LACP_PORT_NTT)) {
 1681                 return;
 1682         }
 1683 
 1684         /* Rate limit to 3 PDUs per LACP_FAST_PERIODIC_TIME */
 1685         if (ppsratecheck(&lp->lp_last_lacpdu, &lp->lp_lacpdu_sent,
 1686                     (3 / LACP_FAST_PERIODIC_TIME)) == 0) {
 1687                 LACP_DPRINTF((lp, "rate limited pdu\n"));
 1688                 return;
 1689         }
 1690 
 1691         error = lacp_xmit_lacpdu(lp);
 1692 
 1693         if (error == 0) {
 1694                 lp->lp_flags &= ~LACP_PORT_NTT;
 1695         } else {
 1696                 LACP_DPRINTF((lp, "lacpdu transmit failure, error %d\n",
 1697                     error));
 1698         }
 1699 }
 1700 
 1701 static void
 1702 lacp_sm_assert_ntt(struct lacp_port *lp)
 1703 {
 1704 
 1705         lp->lp_flags |= LACP_PORT_NTT;
 1706 }
 1707 
 1708 static void
 1709 lacp_run_timers(struct lacp_port *lp)
 1710 {
 1711         int i;
 1712 
 1713         for (i = 0; i < LACP_NTIMER; i++) {
 1714                 KASSERT(lp->lp_timer[i] >= 0,
 1715                     ("invalid timer value %d", lp->lp_timer[i]));
 1716                 if (lp->lp_timer[i] == 0) {
 1717                         continue;
 1718                 } else if (--lp->lp_timer[i] <= 0) {
 1719                         if (lacp_timer_funcs[i]) {
 1720                                 (*lacp_timer_funcs[i])(lp);
 1721                         }
 1722                 }
 1723         }
 1724 }
 1725 
 1726 int
 1727 lacp_marker_input(struct lacp_port *lp, struct mbuf *m)
 1728 {
 1729         struct lacp_softc *lsc = lp->lp_lsc;
 1730         struct lagg_port *lgp = lp->lp_lagg;
 1731         struct lacp_port *lp2;
 1732         struct markerdu *mdu;
 1733         int error = 0;
 1734         int pending = 0;
 1735 
 1736         if (m->m_pkthdr.len != sizeof(*mdu)) {
 1737                 goto bad;
 1738         }
 1739 
 1740         if ((m->m_flags & M_MCAST) == 0) {
 1741                 goto bad;
 1742         }
 1743 
 1744         if (m->m_len < sizeof(*mdu)) {
 1745                 m = m_pullup(m, sizeof(*mdu));
 1746                 if (m == NULL) {
 1747                         return (ENOMEM);
 1748                 }
 1749         }
 1750 
 1751         mdu = mtod(m, struct markerdu *);
 1752 
 1753         if (memcmp(&mdu->mdu_eh.ether_dhost,
 1754             &ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN)) {
 1755                 goto bad;
 1756         }
 1757 
 1758         if (mdu->mdu_sph.sph_version != 1) {
 1759                 goto bad;
 1760         }
 1761 
 1762         switch (mdu->mdu_tlv.tlv_type) {
 1763         case MARKER_TYPE_INFO:
 1764                 if (tlv_check(mdu, sizeof(*mdu), &mdu->mdu_tlv,
 1765                     marker_info_tlv_template, TRUE)) {
 1766                         goto bad;
 1767                 }
 1768                 mdu->mdu_tlv.tlv_type = MARKER_TYPE_RESPONSE;
 1769                 memcpy(&mdu->mdu_eh.ether_dhost,
 1770                     &ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN);
 1771                 memcpy(&mdu->mdu_eh.ether_shost,
 1772                     lgp->lp_lladdr, ETHER_ADDR_LEN);
 1773                 error = lagg_enqueue(lp->lp_ifp, m);
 1774                 break;
 1775 
 1776         case MARKER_TYPE_RESPONSE:
 1777                 if (tlv_check(mdu, sizeof(*mdu), &mdu->mdu_tlv,
 1778                     marker_response_tlv_template, TRUE)) {
 1779                         goto bad;
 1780                 }
 1781                 LACP_DPRINTF((lp, "marker response, port=%u, sys=%6D, id=%u\n",
 1782                     ntohs(mdu->mdu_info.mi_rq_port), mdu->mdu_info.mi_rq_system,
 1783                     ":", ntohl(mdu->mdu_info.mi_rq_xid)));
 1784 
 1785                 /* Verify that it is the last marker we sent out */
 1786                 if (memcmp(&mdu->mdu_info, &lp->lp_marker,
 1787                     sizeof(struct lacp_markerinfo)))
 1788                         goto bad;
 1789 
 1790                 LACP_LOCK(lsc);
 1791                 lp->lp_flags &= ~LACP_PORT_MARK;
 1792 
 1793                 if (lsc->lsc_suppress_distributing) {
 1794                         /* Check if any ports are waiting for a response */
 1795                         LIST_FOREACH(lp2, &lsc->lsc_ports, lp_next) {
 1796                                 if (lp2->lp_flags & LACP_PORT_MARK) {
 1797                                         pending = 1;
 1798                                         break;
 1799                                 }
 1800                         }
 1801 
 1802                         if (pending == 0) {
 1803                                 /* All interface queues are clear */
 1804                                 LACP_DPRINTF((NULL, "queue flush complete\n"));
 1805                                 lsc->lsc_suppress_distributing = FALSE;
 1806                         }
 1807                 }
 1808                 LACP_UNLOCK(lsc);
 1809                 m_freem(m);
 1810                 break;
 1811 
 1812         default:
 1813                 goto bad;
 1814         }
 1815 
 1816         return (error);
 1817 
 1818 bad:
 1819         LACP_DPRINTF((lp, "bad marker frame\n"));
 1820         m_freem(m);
 1821         return (EINVAL);
 1822 }
 1823 
 1824 static int
 1825 tlv_check(const void *p, size_t size, const struct tlvhdr *tlv,
 1826     const struct tlv_template *tmpl, boolean_t check_type)
 1827 {
 1828         while (/* CONSTCOND */ 1) {
 1829                 if ((const char *)tlv - (const char *)p + sizeof(*tlv) > size) {
 1830                         return (EINVAL);
 1831                 }
 1832                 if ((check_type && tlv->tlv_type != tmpl->tmpl_type) ||
 1833                     tlv->tlv_length != tmpl->tmpl_length) {
 1834                         return (EINVAL);
 1835                 }
 1836                 if (tmpl->tmpl_type == 0) {
 1837                         break;
 1838                 }
 1839                 tlv = (const struct tlvhdr *)
 1840                     ((const char *)tlv + tlv->tlv_length);
 1841                 tmpl++;
 1842         }
 1843 
 1844         return (0);
 1845 }
 1846 
 1847 #if defined(LACP_DEBUG)
 1848 const char *
 1849 lacp_format_mac(const uint8_t *mac, char *buf, size_t buflen)
 1850 {
 1851         snprintf(buf, buflen, "%02X-%02X-%02X-%02X-%02X-%02X",
 1852             (int)mac[0],
 1853             (int)mac[1],
 1854             (int)mac[2],
 1855             (int)mac[3],
 1856             (int)mac[4],
 1857             (int)mac[5]);
 1858 
 1859         return (buf);
 1860 }
 1861 
 1862 const char *
 1863 lacp_format_systemid(const struct lacp_systemid *sysid,
 1864     char *buf, size_t buflen)
 1865 {
 1866         char macbuf[LACP_MACSTR_MAX+1];
 1867 
 1868         snprintf(buf, buflen, "%04X,%s",
 1869             ntohs(sysid->lsi_prio),
 1870             lacp_format_mac(sysid->lsi_mac, macbuf, sizeof(macbuf)));
 1871 
 1872         return (buf);
 1873 }
 1874 
 1875 const char *
 1876 lacp_format_portid(const struct lacp_portid *portid, char *buf, size_t buflen)
 1877 {
 1878         snprintf(buf, buflen, "%04X,%04X",
 1879             ntohs(portid->lpi_prio),
 1880             ntohs(portid->lpi_portno));
 1881 
 1882         return (buf);
 1883 }
 1884 
 1885 const char *
 1886 lacp_format_partner(const struct lacp_peerinfo *peer, char *buf, size_t buflen)
 1887 {
 1888         char sysid[LACP_SYSTEMIDSTR_MAX+1];
 1889         char portid[LACP_PORTIDSTR_MAX+1];
 1890 
 1891         snprintf(buf, buflen, "(%s,%04X,%s)",
 1892             lacp_format_systemid(&peer->lip_systemid, sysid, sizeof(sysid)),
 1893             ntohs(peer->lip_key),
 1894             lacp_format_portid(&peer->lip_portid, portid, sizeof(portid)));
 1895 
 1896         return (buf);
 1897 }
 1898 
 1899 const char *
 1900 lacp_format_lagid(const struct lacp_peerinfo *a,
 1901     const struct lacp_peerinfo *b, char *buf, size_t buflen)
 1902 {
 1903         char astr[LACP_PARTNERSTR_MAX+1];
 1904         char bstr[LACP_PARTNERSTR_MAX+1];
 1905 
 1906 #if 0
 1907         /*
 1908          * there's a convention to display small numbered peer
 1909          * in the left.
 1910          */
 1911 
 1912         if (lacp_compare_peerinfo(a, b) > 0) {
 1913                 const struct lacp_peerinfo *t;
 1914 
 1915                 t = a;
 1916                 a = b;
 1917                 b = t;
 1918         }
 1919 #endif
 1920 
 1921         snprintf(buf, buflen, "[%s,%s]",
 1922             lacp_format_partner(a, astr, sizeof(astr)),
 1923             lacp_format_partner(b, bstr, sizeof(bstr)));
 1924 
 1925         return (buf);
 1926 }
 1927 
 1928 const char *
 1929 lacp_format_lagid_aggregator(const struct lacp_aggregator *la,
 1930     char *buf, size_t buflen)
 1931 {
 1932         if (la == NULL) {
 1933                 return ("(none)");
 1934         }
 1935 
 1936         return (lacp_format_lagid(&la->la_actor, &la->la_partner, buf, buflen));
 1937 }
 1938 
 1939 const char *
 1940 lacp_format_state(uint8_t state, char *buf, size_t buflen)
 1941 {
 1942         snprintf(buf, buflen, "%b", state, LACP_STATE_BITS);
 1943         return (buf);
 1944 }
 1945 
 1946 static void
 1947 lacp_dump_lacpdu(const struct lacpdu *du)
 1948 {
 1949         char buf[LACP_PARTNERSTR_MAX+1];
 1950         char buf2[LACP_STATESTR_MAX+1];
 1951 
 1952         printf("actor=%s\n",
 1953             lacp_format_partner(&du->ldu_actor, buf, sizeof(buf)));
 1954         printf("actor.state=%s\n",
 1955             lacp_format_state(du->ldu_actor.lip_state, buf2, sizeof(buf2)));
 1956         printf("partner=%s\n",
 1957             lacp_format_partner(&du->ldu_partner, buf, sizeof(buf)));
 1958         printf("partner.state=%s\n",
 1959             lacp_format_state(du->ldu_partner.lip_state, buf2, sizeof(buf2)));
 1960 
 1961         printf("maxdelay=%d\n", ntohs(du->ldu_collector.lci_maxdelay));
 1962 }
 1963 
 1964 static void
 1965 lacp_dprintf(const struct lacp_port *lp, const char *fmt, ...)
 1966 {
 1967         va_list va;
 1968 
 1969         if (lp) {
 1970                 printf("%s: ", lp->lp_ifp->if_xname);
 1971         }
 1972 
 1973         va_start(va, fmt);
 1974         vprintf(fmt, va);
 1975         va_end(va);
 1976 }
 1977 #endif
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FreeBSD/Linux Kernel Cross Reference sys/net/ieee8023ad_lacp.c

FreeBSD/Linux Kernel Cross Reference
sys/net/ieee8023ad_lacp.c
