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 <sys/sysctl.h>
   42 #include <machine/stdarg.h>
   43 #include <sys/lock.h>
   44 #include <sys/rwlock.h>
   45 
   46 #include <net/if.h>
   47 #include <net/if_dl.h>
   48 #include <net/ethernet.h>
   49 #include <net/if_media.h>
   50 #include <net/if_types.h>
   51 
   52 #include <net/if_lagg.h>
   53 #include <net/ieee8023ad_lacp.h>
   54 
   55 /*
   56  * actor system priority and port priority.
   57  * XXX should be configurable.
   58  */
   59 
   60 #define LACP_SYSTEM_PRIO        0x8000
   61 #define LACP_PORT_PRIO          0x8000
   62 
   63 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] =
   64     { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 };
   65 
   66 static const struct tlv_template lacp_info_tlv_template[] = {
   67         { LACP_TYPE_ACTORINFO,
   68             sizeof(struct tlvhdr) + sizeof(struct lacp_peerinfo) },
   69         { LACP_TYPE_PARTNERINFO,
   70             sizeof(struct tlvhdr) + sizeof(struct lacp_peerinfo) },
   71         { LACP_TYPE_COLLECTORINFO,
   72             sizeof(struct tlvhdr) + sizeof(struct lacp_collectorinfo) },
   73         { 0, 0 },
   74 };
   75 
   76 static const struct tlv_template marker_info_tlv_template[] = {
   77         { MARKER_TYPE_INFO,
   78             sizeof(struct tlvhdr) + sizeof(struct lacp_markerinfo) },
   79         { 0, 0 },
   80 };
   81 
   82 static const struct tlv_template marker_response_tlv_template[] = {
   83         { MARKER_TYPE_RESPONSE,
   84             sizeof(struct tlvhdr) + sizeof(struct lacp_markerinfo) },
   85         { 0, 0 },
   86 };
   87 
   88 typedef void (*lacp_timer_func_t)(struct lacp_port *);
   89 
   90 static void     lacp_fill_actorinfo(struct lacp_port *, struct lacp_peerinfo *);
   91 static void     lacp_fill_markerinfo(struct lacp_port *,
   92                     struct lacp_markerinfo *);
   93 
   94 static uint64_t lacp_aggregator_bandwidth(struct lacp_aggregator *);
   95 static void     lacp_suppress_distributing(struct lacp_softc *,
   96                     struct lacp_aggregator *);
   97 static void     lacp_transit_expire(void *);
   98 static void     lacp_update_portmap(struct lacp_softc *);
   99 static void     lacp_select_active_aggregator(struct lacp_softc *);
  100 static uint16_t lacp_compose_key(struct lacp_port *);
  101 static int      tlv_check(const void *, size_t, const struct tlvhdr *,
  102                     const struct tlv_template *, boolean_t);
  103 static void     lacp_tick(void *);
  104 
  105 static void     lacp_fill_aggregator_id(struct lacp_aggregator *,
  106                     const struct lacp_port *);
  107 static void     lacp_fill_aggregator_id_peer(struct lacp_peerinfo *,
  108                     const struct lacp_peerinfo *);
  109 static int      lacp_aggregator_is_compatible(const struct lacp_aggregator *,
  110                     const struct lacp_port *);
  111 static int      lacp_peerinfo_is_compatible(const struct lacp_peerinfo *,
  112                     const struct lacp_peerinfo *);
  113 
  114 static struct lacp_aggregator *lacp_aggregator_get(struct lacp_softc *,
  115                     struct lacp_port *);
  116 static void     lacp_aggregator_addref(struct lacp_softc *,
  117                     struct lacp_aggregator *);
  118 static void     lacp_aggregator_delref(struct lacp_softc *,
  119                     struct lacp_aggregator *);
  120 
  121 /* receive machine */
  122 
  123 static int      lacp_pdu_input(struct lacp_port *, struct mbuf *);
  124 static int      lacp_marker_input(struct lacp_port *, struct mbuf *);
  125 static void     lacp_sm_rx(struct lacp_port *, const struct lacpdu *);
  126 static void     lacp_sm_rx_timer(struct lacp_port *);
  127 static void     lacp_sm_rx_set_expired(struct lacp_port *);
  128 static void     lacp_sm_rx_update_ntt(struct lacp_port *,
  129                     const struct lacpdu *);
  130 static void     lacp_sm_rx_record_pdu(struct lacp_port *,
  131                     const struct lacpdu *);
  132 static void     lacp_sm_rx_update_selected(struct lacp_port *,
  133                     const struct lacpdu *);
  134 static void     lacp_sm_rx_record_default(struct lacp_port *);
  135 static void     lacp_sm_rx_update_default_selected(struct lacp_port *);
  136 static void     lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *,
  137                     const struct lacp_peerinfo *);
  138 
  139 /* mux machine */
  140 
  141 static void     lacp_sm_mux(struct lacp_port *);
  142 static void     lacp_set_mux(struct lacp_port *, enum lacp_mux_state);
  143 static void     lacp_sm_mux_timer(struct lacp_port *);
  144 
  145 /* periodic transmit machine */
  146 
  147 static void     lacp_sm_ptx_update_timeout(struct lacp_port *, uint8_t);
  148 static void     lacp_sm_ptx_tx_schedule(struct lacp_port *);
  149 static void     lacp_sm_ptx_timer(struct lacp_port *);
  150 
  151 /* transmit machine */
  152 
  153 static void     lacp_sm_tx(struct lacp_port *);
  154 static void     lacp_sm_assert_ntt(struct lacp_port *);
  155 
  156 static void     lacp_run_timers(struct lacp_port *);
  157 static int      lacp_compare_peerinfo(const struct lacp_peerinfo *,
  158                     const struct lacp_peerinfo *);
  159 static int      lacp_compare_systemid(const struct lacp_systemid *,
  160                     const struct lacp_systemid *);
  161 static void     lacp_port_enable(struct lacp_port *);
  162 static void     lacp_port_disable(struct lacp_port *);
  163 static void     lacp_select(struct lacp_port *);
  164 static void     lacp_unselect(struct lacp_port *);
  165 static void     lacp_disable_collecting(struct lacp_port *);
  166 static void     lacp_enable_collecting(struct lacp_port *);
  167 static void     lacp_disable_distributing(struct lacp_port *);
  168 static void     lacp_enable_distributing(struct lacp_port *);
  169 static int      lacp_xmit_lacpdu(struct lacp_port *);
  170 static int      lacp_xmit_marker(struct lacp_port *);
  171 
  172 /* Debugging */
  173 
  174 static void     lacp_dump_lacpdu(const struct lacpdu *);
  175 static const char *lacp_format_partner(const struct lacp_peerinfo *, char *,
  176                     size_t);
  177 static const char *lacp_format_lagid(const struct lacp_peerinfo *,
  178                     const struct lacp_peerinfo *, char *, size_t);
  179 static const char *lacp_format_lagid_aggregator(const struct lacp_aggregator *,
  180                     char *, size_t);
  181 static const char *lacp_format_state(uint8_t, char *, size_t);
  182 static const char *lacp_format_mac(const uint8_t *, char *, size_t);
  183 static const char *lacp_format_systemid(const struct lacp_systemid *, char *,
  184                     size_t);
  185 static const char *lacp_format_portid(const struct lacp_portid *, char *,
  186                     size_t);
  187 static void     lacp_dprintf(const struct lacp_port *, const char *, ...)
  188                     __attribute__((__format__(__printf__, 2, 3)));
  189 
  190 static int lacp_debug = 0;
  191 SYSCTL_INT(_net, OID_AUTO, lacp_debug, CTLFLAG_RW | CTLFLAG_TUN,
  192     &lacp_debug, 0, "Enable LACP debug logging (1=debug, 2=trace)");
  193 TUNABLE_INT("net.lacp_debug", &lacp_debug);
  194 
  195 #define LACP_DPRINTF(a) if (lacp_debug > 0) { lacp_dprintf a ; }
  196 #define LACP_TRACE(a) if (lacp_debug > 1) { lacp_dprintf(a,"%s\n",__func__); }
  197 
  198 /*
  199  * partner administration variables.
  200  * XXX should be configurable.
  201  */
  202 
  203 static const struct lacp_peerinfo lacp_partner_admin = {
  204         .lip_systemid = { .lsi_prio = 0xffff },
  205         .lip_portid = { .lpi_prio = 0xffff },
  206 #if 1
  207         /* optimistic */
  208         .lip_state = LACP_STATE_SYNC | LACP_STATE_AGGREGATION |
  209             LACP_STATE_COLLECTING | LACP_STATE_DISTRIBUTING,
  210 #else
  211         /* pessimistic */
  212         .lip_state = 0,
  213 #endif
  214 };
  215 
  216 static const lacp_timer_func_t lacp_timer_funcs[LACP_NTIMER] = {
  217         [LACP_TIMER_CURRENT_WHILE] = lacp_sm_rx_timer,
  218         [LACP_TIMER_PERIODIC] = lacp_sm_ptx_timer,
  219         [LACP_TIMER_WAIT_WHILE] = lacp_sm_mux_timer,
  220 };
  221 
  222 struct mbuf *
  223 lacp_input(struct lagg_port *lgp, struct mbuf *m)
  224 {
  225         struct lacp_port *lp = LACP_PORT(lgp);
  226         uint8_t subtype;
  227 
  228         if (m->m_pkthdr.len < sizeof(struct ether_header) + sizeof(subtype)) {
  229                 m_freem(m);
  230                 return (NULL);
  231         }
  232 
  233         m_copydata(m, sizeof(struct ether_header), sizeof(subtype), &subtype);
  234         switch (subtype) {
  235                 case SLOWPROTOCOLS_SUBTYPE_LACP:
  236                         lacp_pdu_input(lp, m);
  237                         return (NULL);
  238 
  239                 case SLOWPROTOCOLS_SUBTYPE_MARKER:
  240                         lacp_marker_input(lp, m);
  241                         return (NULL);
  242         }
  243 
  244         /* Not a subtype we are interested in */
  245         return (m);
  246 }
  247 
  248 /*
  249  * lacp_pdu_input: process lacpdu
  250  */
  251 static int
  252 lacp_pdu_input(struct lacp_port *lp, struct mbuf *m)
  253 {
  254         struct lacp_softc *lsc = lp->lp_lsc;
  255         struct lacpdu *du;
  256         int error = 0;
  257 
  258         if (m->m_pkthdr.len != sizeof(*du)) {
  259                 goto bad;
  260         }
  261 
  262         if ((m->m_flags & M_MCAST) == 0) {
  263                 goto bad;
  264         }
  265 
  266         if (m->m_len < sizeof(*du)) {
  267                 m = m_pullup(m, sizeof(*du));
  268                 if (m == NULL) {
  269                         return (ENOMEM);
  270                 }
  271         }
  272 
  273         du = mtod(m, struct lacpdu *);
  274 
  275         if (memcmp(&du->ldu_eh.ether_dhost,
  276             &ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN)) {
  277                 goto bad;
  278         }
  279 
  280         /*
  281          * ignore the version for compatibility with
  282          * the future protocol revisions.
  283          */
  284 #if 0
  285         if (du->ldu_sph.sph_version != 1) {
  286                 goto bad;
  287         }
  288 #endif
  289 
  290         /*
  291          * ignore tlv types for compatibility with
  292          * the future protocol revisions.
  293          */
  294         if (tlv_check(du, sizeof(*du), &du->ldu_tlv_actor,
  295             lacp_info_tlv_template, FALSE)) {
  296                 goto bad;
  297         }
  298 
  299         if (lacp_debug > 0) {
  300                 lacp_dprintf(lp, "lacpdu receive\n");
  301                 lacp_dump_lacpdu(du);
  302         }
  303 
  304         LACP_LOCK(lsc);
  305         lacp_sm_rx(lp, du);
  306         LACP_UNLOCK(lsc);
  307 
  308         m_freem(m);
  309         return (error);
  310 
  311 bad:
  312         m_freem(m);
  313         return (EINVAL);
  314 }
  315 
  316 static void
  317 lacp_fill_actorinfo(struct lacp_port *lp, struct lacp_peerinfo *info)
  318 {
  319         struct lagg_port *lgp = lp->lp_lagg;
  320         struct lagg_softc *sc = lgp->lp_softc;
  321 
  322         info->lip_systemid.lsi_prio = htons(LACP_SYSTEM_PRIO);
  323         memcpy(&info->lip_systemid.lsi_mac,
  324             IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
  325         info->lip_portid.lpi_prio = htons(LACP_PORT_PRIO);
  326         info->lip_portid.lpi_portno = htons(lp->lp_ifp->if_index);
  327         info->lip_state = lp->lp_state;
  328 }
  329 
  330 static void
  331 lacp_fill_markerinfo(struct lacp_port *lp, struct lacp_markerinfo *info)
  332 {
  333         struct ifnet *ifp = lp->lp_ifp;
  334 
  335         /* Fill in the port index and system id (encoded as the MAC) */
  336         info->mi_rq_port = htons(ifp->if_index);
  337         memcpy(&info->mi_rq_system, lp->lp_systemid.lsi_mac, ETHER_ADDR_LEN);
  338         info->mi_rq_xid = htonl(0);
  339 }
  340 
  341 static int
  342 lacp_xmit_lacpdu(struct lacp_port *lp)
  343 {
  344         struct lagg_port *lgp = lp->lp_lagg;
  345         struct mbuf *m;
  346         struct lacpdu *du;
  347         int error;
  348 
  349         LACP_LOCK_ASSERT(lp->lp_lsc);
  350 
  351         m = m_gethdr(M_DONTWAIT, MT_DATA);
  352         if (m == NULL) {
  353                 return (ENOMEM);
  354         }
  355         m->m_len = m->m_pkthdr.len = sizeof(*du);
  356 
  357         du = mtod(m, struct lacpdu *);
  358         memset(du, 0, sizeof(*du));
  359 
  360         memcpy(&du->ldu_eh.ether_dhost, ethermulticastaddr_slowprotocols,
  361             ETHER_ADDR_LEN);
  362         memcpy(&du->ldu_eh.ether_shost, lgp->lp_lladdr, ETHER_ADDR_LEN);
  363         du->ldu_eh.ether_type = htons(ETHERTYPE_SLOW);
  364 
  365         du->ldu_sph.sph_subtype = SLOWPROTOCOLS_SUBTYPE_LACP;
  366         du->ldu_sph.sph_version = 1;
  367 
  368         TLV_SET(&du->ldu_tlv_actor, LACP_TYPE_ACTORINFO, sizeof(du->ldu_actor));
  369         du->ldu_actor = lp->lp_actor;
  370 
  371         TLV_SET(&du->ldu_tlv_partner, LACP_TYPE_PARTNERINFO,
  372             sizeof(du->ldu_partner));
  373         du->ldu_partner = lp->lp_partner;
  374 
  375         TLV_SET(&du->ldu_tlv_collector, LACP_TYPE_COLLECTORINFO,
  376             sizeof(du->ldu_collector));
  377         du->ldu_collector.lci_maxdelay = 0;
  378 
  379         if (lacp_debug > 0) {
  380                 lacp_dprintf(lp, "lacpdu transmit\n");
  381                 lacp_dump_lacpdu(du);
  382         }
  383 
  384         m->m_flags |= M_MCAST;
  385 
  386         /*
  387          * XXX should use higher priority queue.
  388          * otherwise network congestion can break aggregation.
  389          */
  390 
  391         error = lagg_enqueue(lp->lp_ifp, m);
  392         return (error);
  393 }
  394 
  395 static int
  396 lacp_xmit_marker(struct lacp_port *lp)
  397 {
  398         struct lagg_port *lgp = lp->lp_lagg;
  399         struct mbuf *m;
  400         struct markerdu *mdu;
  401         int error;
  402 
  403         LACP_LOCK_ASSERT(lp->lp_lsc);
  404 
  405         m = m_gethdr(M_DONTWAIT, MT_DATA);
  406         if (m == NULL) {
  407                 return (ENOMEM);
  408         }
  409         m->m_len = m->m_pkthdr.len = sizeof(*mdu);
  410 
  411         mdu = mtod(m, struct markerdu *);
  412         memset(mdu, 0, sizeof(*mdu));
  413 
  414         memcpy(&mdu->mdu_eh.ether_dhost, ethermulticastaddr_slowprotocols,
  415             ETHER_ADDR_LEN);
  416         memcpy(&mdu->mdu_eh.ether_shost, lgp->lp_lladdr, ETHER_ADDR_LEN);
  417         mdu->mdu_eh.ether_type = htons(ETHERTYPE_SLOW);
  418 
  419         mdu->mdu_sph.sph_subtype = SLOWPROTOCOLS_SUBTYPE_MARKER;
  420         mdu->mdu_sph.sph_version = 1;
  421 
  422         /* Bump the transaction id and copy over the marker info */
  423         lp->lp_marker.mi_rq_xid = htonl(ntohl(lp->lp_marker.mi_rq_xid) + 1);
  424         TLV_SET(&mdu->mdu_tlv, MARKER_TYPE_INFO, sizeof(mdu->mdu_info));
  425         mdu->mdu_info = lp->lp_marker;
  426 
  427         LACP_DPRINTF((lp, "marker transmit, port=%u, sys=%6D, id=%u\n",
  428             ntohs(mdu->mdu_info.mi_rq_port), mdu->mdu_info.mi_rq_system, ":",
  429             ntohl(mdu->mdu_info.mi_rq_xid)));
  430 
  431         m->m_flags |= M_MCAST;
  432         error = lagg_enqueue(lp->lp_ifp, m);
  433         return (error);
  434 }
  435 
  436 void
  437 lacp_linkstate(struct lagg_port *lgp)
  438 {
  439         struct lacp_port *lp = LACP_PORT(lgp);
  440         struct lacp_softc *lsc = lp->lp_lsc;
  441         struct ifnet *ifp = lgp->lp_ifp;
  442         struct ifmediareq ifmr;
  443         int error = 0;
  444         u_int media;
  445         uint8_t old_state;
  446         uint16_t old_key;
  447 
  448         bzero((char *)&ifmr, sizeof(ifmr));
  449         error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
  450         if (error != 0)
  451                 return;
  452 
  453         LACP_LOCK(lsc);
  454         media = ifmr.ifm_active;
  455         LACP_DPRINTF((lp, "media changed 0x%x -> 0x%x, ether = %d, fdx = %d, "
  456             "link = %d\n", lp->lp_media, media, IFM_TYPE(media) == IFM_ETHER,
  457             (media & IFM_FDX) != 0, ifp->if_link_state == LINK_STATE_UP));
  458         old_state = lp->lp_state;
  459         old_key = lp->lp_key;
  460 
  461         lp->lp_media = media;
  462         /*
  463          * If the port is not an active full duplex Ethernet link then it can
  464          * not be aggregated.
  465          */
  466         if (IFM_TYPE(media) != IFM_ETHER || (media & IFM_FDX) == 0 ||
  467             ifp->if_link_state != LINK_STATE_UP) {
  468                 lacp_port_disable(lp);
  469         } else {
  470                 lacp_port_enable(lp);
  471         }
  472         lp->lp_key = lacp_compose_key(lp);
  473 
  474         if (old_state != lp->lp_state || old_key != lp->lp_key) {
  475                 LACP_DPRINTF((lp, "-> UNSELECTED\n"));
  476                 lp->lp_selected = LACP_UNSELECTED;
  477         }
  478         LACP_UNLOCK(lsc);
  479 }
  480 
  481 static void
  482 lacp_tick(void *arg)
  483 {
  484         struct lacp_softc *lsc = arg;
  485         struct lacp_port *lp;
  486 
  487         LIST_FOREACH(lp, &lsc->lsc_ports, lp_next) {
  488                 if ((lp->lp_state & LACP_STATE_AGGREGATION) == 0)
  489                         continue;
  490 
  491                 lacp_run_timers(lp);
  492 
  493                 lacp_select(lp);
  494                 lacp_sm_mux(lp);
  495                 lacp_sm_tx(lp);
  496                 lacp_sm_ptx_tx_schedule(lp);
  497         }
  498         callout_reset(&lsc->lsc_callout, hz, lacp_tick, lsc);
  499 }
  500 
  501 int
  502 lacp_port_create(struct lagg_port *lgp)
  503 {
  504         struct lagg_softc *sc = lgp->lp_softc;
  505         struct lacp_softc *lsc = LACP_SOFTC(sc);
  506         struct lacp_port *lp;
  507         struct ifnet *ifp = lgp->lp_ifp;
  508         struct sockaddr_dl sdl;
  509         struct ifmultiaddr *rifma = NULL;
  510         int error;
  511 
  512         boolean_t active = TRUE; /* XXX should be configurable */
  513         boolean_t fast = FALSE; /* XXX should be configurable */
  514 
  515         bzero((char *)&sdl, sizeof(sdl));
  516         sdl.sdl_len = sizeof(sdl);
  517         sdl.sdl_family = AF_LINK;
  518         sdl.sdl_index = ifp->if_index;
  519         sdl.sdl_type = IFT_ETHER;
  520         sdl.sdl_alen = ETHER_ADDR_LEN;
  521 
  522         bcopy(&ethermulticastaddr_slowprotocols,
  523             LLADDR(&sdl), ETHER_ADDR_LEN);
  524         error = if_addmulti(ifp, (struct sockaddr *)&sdl, &rifma);
  525         if (error) {
  526                 printf("%s: ADDMULTI failed on %s\n", __func__, lgp->lp_ifname);
  527                 return (error);
  528         }
  529 
  530         lp = malloc(sizeof(struct lacp_port),
  531             M_DEVBUF, M_NOWAIT|M_ZERO);
  532         if (lp == NULL)
  533                 return (ENOMEM);
  534 
  535         LACP_LOCK(lsc);
  536         lgp->lp_psc = (caddr_t)lp;
  537         lp->lp_ifp = ifp;
  538         lp->lp_lagg = lgp;
  539         lp->lp_lsc = lsc;
  540         lp->lp_ifma = rifma;
  541 
  542         LIST_INSERT_HEAD(&lsc->lsc_ports, lp, lp_next);
  543 
  544         lacp_fill_actorinfo(lp, &lp->lp_actor);
  545         lacp_fill_markerinfo(lp, &lp->lp_marker);
  546         lp->lp_state =
  547             (active ? LACP_STATE_ACTIVITY : 0) |
  548             (fast ? LACP_STATE_TIMEOUT : 0);
  549         lp->lp_aggregator = NULL;
  550         lacp_sm_rx_set_expired(lp);
  551         LACP_UNLOCK(lsc);
  552         lacp_linkstate(lgp);
  553 
  554         return (0);
  555 }
  556 
  557 void
  558 lacp_port_destroy(struct lagg_port *lgp)
  559 {
  560         struct lacp_port *lp = LACP_PORT(lgp);
  561         struct lacp_softc *lsc = lp->lp_lsc;
  562         int i;
  563 
  564         LACP_LOCK(lsc);
  565         for (i = 0; i < LACP_NTIMER; i++) {
  566                 LACP_TIMER_DISARM(lp, i);
  567         }
  568 
  569         lacp_disable_collecting(lp);
  570         lacp_disable_distributing(lp);
  571         lacp_unselect(lp);
  572 
  573         /* The address may have already been removed by if_purgemaddrs() */
  574         if (!lgp->lp_detaching)
  575                 if_delmulti_ifma(lp->lp_ifma);
  576 
  577         LIST_REMOVE(lp, lp_next);
  578         LACP_UNLOCK(lsc);
  579         free(lp, M_DEVBUF);
  580 }
  581 
  582 void
  583 lacp_req(struct lagg_softc *sc, caddr_t data)
  584 {
  585         struct lacp_opreq *req = (struct lacp_opreq *)data;
  586         struct lacp_softc *lsc = LACP_SOFTC(sc);
  587         struct lacp_aggregator *la;
  588 
  589         bzero(req, sizeof(struct lacp_opreq));
  590         
  591         /* 
  592          * If the LACP softc is NULL, return with the opreq structure full of
  593          * zeros.  It is normal for the softc to be NULL while the lagg is
  594          * being destroyed.
  595          */
  596         if (NULL == lsc)
  597                 return;
  598 
  599         la = lsc->lsc_active_aggregator;
  600         LACP_LOCK(lsc);
  601         if (la != NULL) {
  602                 req->actor_prio = ntohs(la->la_actor.lip_systemid.lsi_prio);
  603                 memcpy(&req->actor_mac, &la->la_actor.lip_systemid.lsi_mac,
  604                     ETHER_ADDR_LEN);
  605                 req->actor_key = ntohs(la->la_actor.lip_key);
  606                 req->actor_portprio = ntohs(la->la_actor.lip_portid.lpi_prio);
  607                 req->actor_portno = ntohs(la->la_actor.lip_portid.lpi_portno);
  608                 req->actor_state = la->la_actor.lip_state;
  609 
  610                 req->partner_prio = ntohs(la->la_partner.lip_systemid.lsi_prio);
  611                 memcpy(&req->partner_mac, &la->la_partner.lip_systemid.lsi_mac,
  612                     ETHER_ADDR_LEN);
  613                 req->partner_key = ntohs(la->la_partner.lip_key);
  614                 req->partner_portprio = ntohs(la->la_partner.lip_portid.lpi_prio);
  615                 req->partner_portno = ntohs(la->la_partner.lip_portid.lpi_portno);
  616                 req->partner_state = la->la_partner.lip_state;
  617         }
  618         LACP_UNLOCK(lsc);
  619 }
  620 
  621 void
  622 lacp_portreq(struct lagg_port *lgp, caddr_t data)
  623 {
  624         struct lacp_opreq *req = (struct lacp_opreq *)data;
  625         struct lacp_port *lp = LACP_PORT(lgp);
  626         struct lacp_softc *lsc = lp->lp_lsc;
  627 
  628         LACP_LOCK(lsc);
  629         req->actor_prio = ntohs(lp->lp_actor.lip_systemid.lsi_prio);
  630         memcpy(&req->actor_mac, &lp->lp_actor.lip_systemid.lsi_mac,
  631             ETHER_ADDR_LEN);
  632         req->actor_key = ntohs(lp->lp_actor.lip_key);
  633         req->actor_portprio = ntohs(lp->lp_actor.lip_portid.lpi_prio);
  634         req->actor_portno = ntohs(lp->lp_actor.lip_portid.lpi_portno);
  635         req->actor_state = lp->lp_actor.lip_state;
  636 
  637         req->partner_prio = ntohs(lp->lp_partner.lip_systemid.lsi_prio);
  638         memcpy(&req->partner_mac, &lp->lp_partner.lip_systemid.lsi_mac,
  639             ETHER_ADDR_LEN);
  640         req->partner_key = ntohs(lp->lp_partner.lip_key);
  641         req->partner_portprio = ntohs(lp->lp_partner.lip_portid.lpi_prio);
  642         req->partner_portno = ntohs(lp->lp_partner.lip_portid.lpi_portno);
  643         req->partner_state = lp->lp_partner.lip_state;
  644         LACP_UNLOCK(lsc);
  645 }
  646 
  647 static void
  648 lacp_disable_collecting(struct lacp_port *lp)
  649 {
  650         LACP_DPRINTF((lp, "collecting disabled\n"));
  651         lp->lp_state &= ~LACP_STATE_COLLECTING;
  652 }
  653 
  654 static void
  655 lacp_enable_collecting(struct lacp_port *lp)
  656 {
  657         LACP_DPRINTF((lp, "collecting enabled\n"));
  658         lp->lp_state |= LACP_STATE_COLLECTING;
  659 }
  660 
  661 static void
  662 lacp_disable_distributing(struct lacp_port *lp)
  663 {
  664         struct lacp_aggregator *la = lp->lp_aggregator;
  665         struct lacp_softc *lsc = lp->lp_lsc;
  666         char buf[LACP_LAGIDSTR_MAX+1];
  667 
  668         LACP_LOCK_ASSERT(lsc);
  669 
  670         if (la == NULL || (lp->lp_state & LACP_STATE_DISTRIBUTING) == 0) {
  671                 return;
  672         }
  673 
  674         KASSERT(!TAILQ_EMPTY(&la->la_ports), ("no aggregator ports"));
  675         KASSERT(la->la_nports > 0, ("nports invalid (%d)", la->la_nports));
  676         KASSERT(la->la_refcnt >= la->la_nports, ("aggregator refcnt invalid"));
  677 
  678         LACP_DPRINTF((lp, "disable distributing on aggregator %s, "
  679             "nports %d -> %d\n",
  680             lacp_format_lagid_aggregator(la, buf, sizeof(buf)),
  681             la->la_nports, la->la_nports - 1));
  682 
  683         TAILQ_REMOVE(&la->la_ports, lp, lp_dist_q);
  684         la->la_nports--;
  685 
  686         if (lsc->lsc_active_aggregator == la) {
  687                 lacp_suppress_distributing(lsc, la);
  688                 lacp_select_active_aggregator(lsc);
  689                 /* regenerate the port map, the active aggregator has changed */
  690                 lacp_update_portmap(lsc);
  691         }
  692 
  693         lp->lp_state &= ~LACP_STATE_DISTRIBUTING;
  694 }
  695 
  696 static void
  697 lacp_enable_distributing(struct lacp_port *lp)
  698 {
  699         struct lacp_aggregator *la = lp->lp_aggregator;
  700         struct lacp_softc *lsc = lp->lp_lsc;
  701         char buf[LACP_LAGIDSTR_MAX+1];
  702 
  703         LACP_LOCK_ASSERT(lsc);
  704 
  705         if ((lp->lp_state & LACP_STATE_DISTRIBUTING) != 0) {
  706                 return;
  707         }
  708 
  709         LACP_DPRINTF((lp, "enable distributing on aggregator %s, "
  710             "nports %d -> %d\n",
  711             lacp_format_lagid_aggregator(la, buf, sizeof(buf)),
  712             la->la_nports, la->la_nports + 1));
  713 
  714         KASSERT(la->la_refcnt > la->la_nports, ("aggregator refcnt invalid"));
  715         TAILQ_INSERT_HEAD(&la->la_ports, lp, lp_dist_q);
  716         la->la_nports++;
  717 
  718         lp->lp_state |= LACP_STATE_DISTRIBUTING;
  719 
  720         if (lsc->lsc_active_aggregator == la) {
  721                 lacp_suppress_distributing(lsc, la);
  722                 lacp_update_portmap(lsc);
  723         } else
  724                 /* try to become the active aggregator */
  725                 lacp_select_active_aggregator(lsc);
  726 }
  727 
  728 static void
  729 lacp_transit_expire(void *vp)
  730 {
  731         struct lacp_softc *lsc = vp;
  732 
  733         LACP_LOCK_ASSERT(lsc);
  734 
  735         LACP_TRACE(NULL);
  736 
  737         lsc->lsc_suppress_distributing = FALSE;
  738 }
  739 
  740 int
  741 lacp_attach(struct lagg_softc *sc)
  742 {
  743         struct lacp_softc *lsc;
  744 
  745         lsc = malloc(sizeof(struct lacp_softc),
  746             M_DEVBUF, M_NOWAIT|M_ZERO);
  747         if (lsc == NULL)
  748                 return (ENOMEM);
  749 
  750         sc->sc_psc = (caddr_t)lsc;
  751         lsc->lsc_softc = sc;
  752 
  753         lsc->lsc_hashkey = arc4random();
  754         lsc->lsc_active_aggregator = NULL;
  755         LACP_LOCK_INIT(lsc);
  756         TAILQ_INIT(&lsc->lsc_aggregators);
  757         LIST_INIT(&lsc->lsc_ports);
  758 
  759         callout_init_mtx(&lsc->lsc_transit_callout, &lsc->lsc_mtx, 0);
  760         callout_init_mtx(&lsc->lsc_callout, &lsc->lsc_mtx, 0);
  761 
  762         /* if the lagg is already up then do the same */
  763         if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING)
  764                 lacp_init(sc);
  765 
  766         return (0);
  767 }
  768 
  769 int
  770 lacp_detach(struct lagg_softc *sc)
  771 {
  772         struct lacp_softc *lsc = LACP_SOFTC(sc);
  773 
  774         KASSERT(TAILQ_EMPTY(&lsc->lsc_aggregators),
  775             ("aggregators still active"));
  776         KASSERT(lsc->lsc_active_aggregator == NULL,
  777             ("aggregator still attached"));
  778 
  779         sc->sc_psc = NULL;
  780         callout_drain(&lsc->lsc_transit_callout);
  781         callout_drain(&lsc->lsc_callout);
  782 
  783         LACP_LOCK_DESTROY(lsc);
  784         free(lsc, M_DEVBUF);
  785         return (0);
  786 }
  787 
  788 void
  789 lacp_init(struct lagg_softc *sc)
  790 {
  791         struct lacp_softc *lsc = LACP_SOFTC(sc);
  792 
  793         LACP_LOCK(lsc);
  794         callout_reset(&lsc->lsc_callout, hz, lacp_tick, lsc);
  795         LACP_UNLOCK(lsc);
  796 }
  797 
  798 void
  799 lacp_stop(struct lagg_softc *sc)
  800 {
  801         struct lacp_softc *lsc = LACP_SOFTC(sc);
  802 
  803         LACP_LOCK(lsc);
  804         callout_stop(&lsc->lsc_transit_callout);
  805         callout_stop(&lsc->lsc_callout);
  806         LACP_UNLOCK(lsc);
  807 }
  808 
  809 struct lagg_port *
  810 lacp_select_tx_port(struct lagg_softc *sc, struct mbuf *m)
  811 {
  812         struct lacp_softc *lsc = LACP_SOFTC(sc);
  813         struct lacp_portmap *pm;
  814         struct lacp_port *lp;
  815         uint32_t hash;
  816 
  817         if (__predict_false(lsc->lsc_suppress_distributing)) {
  818                 LACP_DPRINTF((NULL, "%s: waiting transit\n", __func__));
  819                 return (NULL);
  820         }
  821 
  822         pm = &lsc->lsc_pmap[lsc->lsc_activemap];
  823         if (pm->pm_count == 0) {
  824                 LACP_DPRINTF((NULL, "%s: no active aggregator\n", __func__));
  825                 return (NULL);
  826         }
  827 
  828         if (sc->use_flowid && (m->m_flags & M_FLOWID))
  829                 hash = m->m_pkthdr.flowid;
  830         else
  831                 hash = lagg_hashmbuf(sc, m, lsc->lsc_hashkey);
  832         hash %= pm->pm_count;
  833         lp = pm->pm_map[hash];
  834 
  835         KASSERT((lp->lp_state & LACP_STATE_DISTRIBUTING) != 0,
  836             ("aggregated port is not distributing"));
  837 
  838         return (lp->lp_lagg);
  839 }
  840 /*
  841  * lacp_suppress_distributing: drop transmit packets for a while
  842  * to preserve packet ordering.
  843  */
  844 
  845 static void
  846 lacp_suppress_distributing(struct lacp_softc *lsc, struct lacp_aggregator *la)
  847 {
  848         struct lacp_port *lp;
  849 
  850         if (lsc->lsc_active_aggregator != la) {
  851                 return;
  852         }
  853 
  854         LACP_TRACE(NULL);
  855 
  856         lsc->lsc_suppress_distributing = TRUE;
  857 
  858         /* send a marker frame down each port to verify the queues are empty */
  859         LIST_FOREACH(lp, &lsc->lsc_ports, lp_next) {
  860                 lp->lp_flags |= LACP_PORT_MARK;
  861                 lacp_xmit_marker(lp);
  862         }
  863 
  864         /* set a timeout for the marker frames */
  865         callout_reset(&lsc->lsc_transit_callout,
  866             LACP_TRANSIT_DELAY * hz / 1000, lacp_transit_expire, lsc);
  867 }
  868 
  869 static int
  870 lacp_compare_peerinfo(const struct lacp_peerinfo *a,
  871     const struct lacp_peerinfo *b)
  872 {
  873         return (memcmp(a, b, offsetof(struct lacp_peerinfo, lip_state)));
  874 }
  875 
  876 static int
  877 lacp_compare_systemid(const struct lacp_systemid *a,
  878     const struct lacp_systemid *b)
  879 {
  880         return (memcmp(a, b, sizeof(*a)));
  881 }
  882 
  883 #if 0   /* unused */
  884 static int
  885 lacp_compare_portid(const struct lacp_portid *a,
  886     const struct lacp_portid *b)
  887 {
  888         return (memcmp(a, b, sizeof(*a)));
  889 }
  890 #endif
  891 
  892 static uint64_t
  893 lacp_aggregator_bandwidth(struct lacp_aggregator *la)
  894 {
  895         struct lacp_port *lp;
  896         uint64_t speed;
  897 
  898         lp = TAILQ_FIRST(&la->la_ports);
  899         if (lp == NULL) {
  900                 return (0);
  901         }
  902 
  903         speed = ifmedia_baudrate(lp->lp_media);
  904         speed *= la->la_nports;
  905         if (speed == 0) {
  906                 LACP_DPRINTF((lp, "speed 0? media=0x%x nports=%d\n",
  907                     lp->lp_media, la->la_nports));
  908         }
  909 
  910         return (speed);
  911 }
  912 
  913 /*
  914  * lacp_select_active_aggregator: select an aggregator to be used to transmit
  915  * packets from lagg(4) interface.
  916  */
  917 
  918 static void
  919 lacp_select_active_aggregator(struct lacp_softc *lsc)
  920 {
  921         struct lagg_softc *sc = lsc->lsc_softc;
  922         struct lacp_aggregator *la;
  923         struct lacp_aggregator *best_la = NULL;
  924         uint64_t best_speed = 0;
  925         char buf[LACP_LAGIDSTR_MAX+1];
  926 
  927         LACP_TRACE(NULL);
  928 
  929         TAILQ_FOREACH(la, &lsc->lsc_aggregators, la_q) {
  930                 uint64_t speed;
  931 
  932                 if (la->la_nports == 0) {
  933                         continue;
  934                 }
  935 
  936                 speed = lacp_aggregator_bandwidth(la);
  937                 LACP_DPRINTF((NULL, "%s, speed=%jd, nports=%d\n",
  938                     lacp_format_lagid_aggregator(la, buf, sizeof(buf)),
  939                     speed, la->la_nports));
  940 
  941                 /* This aggregator is chosen if
  942                  *      the partner has a better system priority
  943                  *  or, the total aggregated speed is higher
  944                  *  or, it is already the chosen aggregator
  945                  */
  946                 if ((best_la != NULL && LACP_SYS_PRI(la->la_partner) <
  947                      LACP_SYS_PRI(best_la->la_partner)) ||
  948                     speed > best_speed ||
  949                     (speed == best_speed &&
  950                     la == lsc->lsc_active_aggregator)) {
  951                         best_la = la;
  952                         best_speed = speed;
  953                 }
  954         }
  955 
  956         KASSERT(best_la == NULL || best_la->la_nports > 0,
  957             ("invalid aggregator refcnt"));
  958         KASSERT(best_la == NULL || !TAILQ_EMPTY(&best_la->la_ports),
  959             ("invalid aggregator list"));
  960 
  961         if (lsc->lsc_active_aggregator != best_la) {
  962                 LACP_DPRINTF((NULL, "active aggregator changed\n"));
  963                 LACP_DPRINTF((NULL, "old %s\n",
  964                     lacp_format_lagid_aggregator(lsc->lsc_active_aggregator,
  965                     buf, sizeof(buf))));
  966         } else {
  967                 LACP_DPRINTF((NULL, "active aggregator not changed\n"));
  968         }
  969         LACP_DPRINTF((NULL, "new %s\n",
  970             lacp_format_lagid_aggregator(best_la, buf, sizeof(buf))));
  971 
  972         if (lsc->lsc_active_aggregator != best_la) {
  973                 sc->sc_ifp->if_baudrate = best_speed;
  974                 lsc->lsc_active_aggregator = best_la;
  975                 lacp_update_portmap(lsc);
  976                 if (best_la) {
  977                         lacp_suppress_distributing(lsc, best_la);
  978                 }
  979         }
  980 }
  981 
  982 /*
  983  * Updated the inactive portmap array with the new list of ports and
  984  * make it live.
  985  */
  986 static void
  987 lacp_update_portmap(struct lacp_softc *lsc)
  988 {
  989         struct lacp_aggregator *la;
  990         struct lacp_portmap *p;
  991         struct lacp_port *lp;
  992         u_int newmap;
  993         int i;
  994 
  995         newmap = lsc->lsc_activemap == 0 ? 1 : 0;
  996         p = &lsc->lsc_pmap[newmap];
  997         la = lsc->lsc_active_aggregator;
  998         bzero(p, sizeof(struct lacp_portmap));
  999 
 1000         if (la != NULL && la->la_nports > 0) {
 1001                 p->pm_count = la->la_nports;
 1002                 i = 0;
 1003                 TAILQ_FOREACH(lp, &la->la_ports, lp_dist_q)
 1004                         p->pm_map[i++] = lp;
 1005                 KASSERT(i == p->pm_count, ("Invalid port count"));
 1006         }
 1007 
 1008         /* switch the active portmap over */
 1009         atomic_store_rel_int(&lsc->lsc_activemap, newmap);
 1010         LACP_DPRINTF((NULL, "Set table %d with %d ports\n",
 1011                     lsc->lsc_activemap,
 1012                     lsc->lsc_pmap[lsc->lsc_activemap].pm_count));
 1013 }
 1014 
 1015 static uint16_t
 1016 lacp_compose_key(struct lacp_port *lp)
 1017 {
 1018         struct lagg_port *lgp = lp->lp_lagg;
 1019         struct lagg_softc *sc = lgp->lp_softc;
 1020         u_int media = lp->lp_media;
 1021         uint16_t key;
 1022 
 1023         if ((lp->lp_state & LACP_STATE_AGGREGATION) == 0) {
 1024 
 1025                 /*
 1026                  * non-aggregatable links should have unique keys.
 1027                  *
 1028                  * XXX this isn't really unique as if_index is 16 bit.
 1029                  */
 1030 
 1031                 /* bit 0..14:   (some bits of) if_index of this port */
 1032                 key = lp->lp_ifp->if_index;
 1033                 /* bit 15:      1 */
 1034                 key |= 0x8000;
 1035         } else {
 1036                 u_int subtype = IFM_SUBTYPE(media);
 1037 
 1038                 KASSERT(IFM_TYPE(media) == IFM_ETHER, ("invalid media type"));
 1039                 KASSERT((media & IFM_FDX) != 0, ("aggregating HDX interface"));
 1040 
 1041                 /* bit 0..4:    IFM_SUBTYPE modulo speed */
 1042                 switch (subtype) {
 1043                 case IFM_10_T:
 1044                 case IFM_10_2:
 1045                 case IFM_10_5:
 1046                 case IFM_10_STP:
 1047                 case IFM_10_FL:
 1048                         key = IFM_10_T;
 1049                         break;
 1050                 case IFM_100_TX:
 1051                 case IFM_100_FX:
 1052                 case IFM_100_T4:
 1053                 case IFM_100_VG:
 1054                 case IFM_100_T2:
 1055                         key = IFM_100_TX;
 1056                         break;
 1057                 case IFM_1000_SX:
 1058                 case IFM_1000_LX:
 1059                 case IFM_1000_CX:
 1060                 case IFM_1000_T:
 1061                         key = IFM_1000_SX;
 1062                         break;
 1063                 case IFM_10G_LR:
 1064                 case IFM_10G_SR:
 1065                 case IFM_10G_CX4:
 1066                 case IFM_10G_TWINAX:
 1067                 case IFM_10G_TWINAX_LONG:
 1068                 case IFM_10G_LRM:
 1069                 case IFM_10G_T:
 1070                         key = IFM_10G_LR;
 1071                         break;
 1072                 case IFM_40G_CR4:
 1073                 case IFM_40G_SR4:
 1074                 case IFM_40G_LR4:
 1075                         key = IFM_40G_CR4;
 1076                         break;
 1077                 default:
 1078                         key = subtype;
 1079                 }
 1080                 /* bit 5..14:   (some bits of) if_index of lagg device */
 1081                 key |= 0x7fe0 & ((sc->sc_ifp->if_index) << 5);
 1082                 /* bit 15:      0 */
 1083         }
 1084         return (htons(key));
 1085 }
 1086 
 1087 static void
 1088 lacp_aggregator_addref(struct lacp_softc *lsc, struct lacp_aggregator *la)
 1089 {
 1090         char buf[LACP_LAGIDSTR_MAX+1];
 1091 
 1092         LACP_DPRINTF((NULL, "%s: lagid=%s, refcnt %d -> %d\n",
 1093             __func__,
 1094             lacp_format_lagid(&la->la_actor, &la->la_partner,
 1095             buf, sizeof(buf)),
 1096             la->la_refcnt, la->la_refcnt + 1));
 1097 
 1098         KASSERT(la->la_refcnt > 0, ("refcount <= 0"));
 1099         la->la_refcnt++;
 1100         KASSERT(la->la_refcnt > la->la_nports, ("invalid refcount"));
 1101 }
 1102 
 1103 static void
 1104 lacp_aggregator_delref(struct lacp_softc *lsc, struct lacp_aggregator *la)
 1105 {
 1106         char buf[LACP_LAGIDSTR_MAX+1];
 1107 
 1108         LACP_DPRINTF((NULL, "%s: lagid=%s, refcnt %d -> %d\n",
 1109             __func__,
 1110             lacp_format_lagid(&la->la_actor, &la->la_partner,
 1111             buf, sizeof(buf)),
 1112             la->la_refcnt, la->la_refcnt - 1));
 1113 
 1114         KASSERT(la->la_refcnt > la->la_nports, ("invalid refcnt"));
 1115         la->la_refcnt--;
 1116         if (la->la_refcnt > 0) {
 1117                 return;
 1118         }
 1119 
 1120         KASSERT(la->la_refcnt == 0, ("refcount not zero"));
 1121         KASSERT(lsc->lsc_active_aggregator != la, ("aggregator active"));
 1122 
 1123         TAILQ_REMOVE(&lsc->lsc_aggregators, la, la_q);
 1124 
 1125         free(la, M_DEVBUF);
 1126 }
 1127 
 1128 /*
 1129  * lacp_aggregator_get: allocate an aggregator.
 1130  */
 1131 
 1132 static struct lacp_aggregator *
 1133 lacp_aggregator_get(struct lacp_softc *lsc, struct lacp_port *lp)
 1134 {
 1135         struct lacp_aggregator *la;
 1136 
 1137         la = malloc(sizeof(*la), M_DEVBUF, M_NOWAIT);
 1138         if (la) {
 1139                 la->la_refcnt = 1;
 1140                 la->la_nports = 0;
 1141                 TAILQ_INIT(&la->la_ports);
 1142                 la->la_pending = 0;
 1143                 TAILQ_INSERT_TAIL(&lsc->lsc_aggregators, la, la_q);
 1144         }
 1145 
 1146         return (la);
 1147 }
 1148 
 1149 /*
 1150  * lacp_fill_aggregator_id: setup a newly allocated aggregator from a port.
 1151  */
 1152 
 1153 static void
 1154 lacp_fill_aggregator_id(struct lacp_aggregator *la, const struct lacp_port *lp)
 1155 {
 1156         lacp_fill_aggregator_id_peer(&la->la_partner, &lp->lp_partner);
 1157         lacp_fill_aggregator_id_peer(&la->la_actor, &lp->lp_actor);
 1158 
 1159         la->la_actor.lip_state = lp->lp_state & LACP_STATE_AGGREGATION;
 1160 }
 1161 
 1162 static void
 1163 lacp_fill_aggregator_id_peer(struct lacp_peerinfo *lpi_aggr,
 1164     const struct lacp_peerinfo *lpi_port)
 1165 {
 1166         memset(lpi_aggr, 0, sizeof(*lpi_aggr));
 1167         lpi_aggr->lip_systemid = lpi_port->lip_systemid;
 1168         lpi_aggr->lip_key = lpi_port->lip_key;
 1169 }
 1170 
 1171 /*
 1172  * lacp_aggregator_is_compatible: check if a port can join to an aggregator.
 1173  */
 1174 
 1175 static int
 1176 lacp_aggregator_is_compatible(const struct lacp_aggregator *la,
 1177     const struct lacp_port *lp)
 1178 {
 1179         if (!(lp->lp_state & LACP_STATE_AGGREGATION) ||
 1180             !(lp->lp_partner.lip_state & LACP_STATE_AGGREGATION)) {
 1181                 return (0);
 1182         }
 1183 
 1184         if (!(la->la_actor.lip_state & LACP_STATE_AGGREGATION)) {
 1185                 return (0);
 1186         }
 1187 
 1188         if (!lacp_peerinfo_is_compatible(&la->la_partner, &lp->lp_partner)) {
 1189                 return (0);
 1190         }
 1191 
 1192         if (!lacp_peerinfo_is_compatible(&la->la_actor, &lp->lp_actor)) {
 1193                 return (0);
 1194         }
 1195 
 1196         return (1);
 1197 }
 1198 
 1199 static int
 1200 lacp_peerinfo_is_compatible(const struct lacp_peerinfo *a,
 1201     const struct lacp_peerinfo *b)
 1202 {
 1203         if (memcmp(&a->lip_systemid, &b->lip_systemid,
 1204             sizeof(a->lip_systemid))) {
 1205                 return (0);
 1206         }
 1207 
 1208         if (memcmp(&a->lip_key, &b->lip_key, sizeof(a->lip_key))) {
 1209                 return (0);
 1210         }
 1211 
 1212         return (1);
 1213 }
 1214 
 1215 static void
 1216 lacp_port_enable(struct lacp_port *lp)
 1217 {
 1218         lp->lp_state |= LACP_STATE_AGGREGATION;
 1219 }
 1220 
 1221 static void
 1222 lacp_port_disable(struct lacp_port *lp)
 1223 {
 1224         lacp_set_mux(lp, LACP_MUX_DETACHED);
 1225 
 1226         lp->lp_state &= ~LACP_STATE_AGGREGATION;
 1227         lp->lp_selected = LACP_UNSELECTED;
 1228         lacp_sm_rx_record_default(lp);
 1229         lp->lp_partner.lip_state &= ~LACP_STATE_AGGREGATION;
 1230         lp->lp_state &= ~LACP_STATE_EXPIRED;
 1231 }
 1232 
 1233 /*
 1234  * lacp_select: select an aggregator.  create one if necessary.
 1235  */
 1236 static void
 1237 lacp_select(struct lacp_port *lp)
 1238 {
 1239         struct lacp_softc *lsc = lp->lp_lsc;
 1240         struct lacp_aggregator *la;
 1241         char buf[LACP_LAGIDSTR_MAX+1];
 1242 
 1243         if (lp->lp_aggregator) {
 1244                 return;
 1245         }
 1246 
 1247         KASSERT(!LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE),
 1248             ("timer_wait_while still active"));
 1249 
 1250         LACP_DPRINTF((lp, "port lagid=%s\n",
 1251             lacp_format_lagid(&lp->lp_actor, &lp->lp_partner,
 1252             buf, sizeof(buf))));
 1253 
 1254         TAILQ_FOREACH(la, &lsc->lsc_aggregators, la_q) {
 1255                 if (lacp_aggregator_is_compatible(la, lp)) {
 1256                         break;
 1257                 }
 1258         }
 1259 
 1260         if (la == NULL) {
 1261                 la = lacp_aggregator_get(lsc, lp);
 1262                 if (la == NULL) {
 1263                         LACP_DPRINTF((lp, "aggregator creation failed\n"));
 1264 
 1265                         /*
 1266                          * will retry on the next tick.
 1267                          */
 1268 
 1269                         return;
 1270                 }
 1271                 lacp_fill_aggregator_id(la, lp);
 1272                 LACP_DPRINTF((lp, "aggregator created\n"));
 1273         } else {
 1274                 LACP_DPRINTF((lp, "compatible aggregator found\n"));
 1275                 if (la->la_refcnt == LACP_MAX_PORTS)
 1276                         return;
 1277                 lacp_aggregator_addref(lsc, la);
 1278         }
 1279 
 1280         LACP_DPRINTF((lp, "aggregator lagid=%s\n",
 1281             lacp_format_lagid(&la->la_actor, &la->la_partner,
 1282             buf, sizeof(buf))));
 1283 
 1284         lp->lp_aggregator = la;
 1285         lp->lp_selected = LACP_SELECTED;
 1286 }
 1287 
 1288 /*
 1289  * lacp_unselect: finish unselect/detach process.
 1290  */
 1291 
 1292 static void
 1293 lacp_unselect(struct lacp_port *lp)
 1294 {
 1295         struct lacp_softc *lsc = lp->lp_lsc;
 1296         struct lacp_aggregator *la = lp->lp_aggregator;
 1297 
 1298         KASSERT(!LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE),
 1299             ("timer_wait_while still active"));
 1300 
 1301         if (la == NULL) {
 1302                 return;
 1303         }
 1304 
 1305         lp->lp_aggregator = NULL;
 1306         lacp_aggregator_delref(lsc, la);
 1307 }
 1308 
 1309 /* mux machine */
 1310 
 1311 static void
 1312 lacp_sm_mux(struct lacp_port *lp)
 1313 {
 1314         enum lacp_mux_state new_state;
 1315         boolean_t p_sync =
 1316                     (lp->lp_partner.lip_state & LACP_STATE_SYNC) != 0;
 1317         boolean_t p_collecting =
 1318             (lp->lp_partner.lip_state & LACP_STATE_COLLECTING) != 0;
 1319         enum lacp_selected selected = lp->lp_selected;
 1320         struct lacp_aggregator *la;
 1321 
 1322         if (lacp_debug > 1)
 1323                 lacp_dprintf(lp, "%s: state %d\n", __func__, lp->lp_mux_state);
 1324 
 1325 re_eval:
 1326         la = lp->lp_aggregator;
 1327         KASSERT(lp->lp_mux_state == LACP_MUX_DETACHED || la != NULL,
 1328             ("MUX not detached"));
 1329         new_state = lp->lp_mux_state;
 1330         switch (lp->lp_mux_state) {
 1331         case LACP_MUX_DETACHED:
 1332                 if (selected != LACP_UNSELECTED) {
 1333                         new_state = LACP_MUX_WAITING;
 1334                 }
 1335                 break;
 1336         case LACP_MUX_WAITING:
 1337                 KASSERT(la->la_pending > 0 ||
 1338                     !LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE),
 1339                     ("timer_wait_while still active"));
 1340                 if (selected == LACP_SELECTED && la->la_pending == 0) {
 1341                         new_state = LACP_MUX_ATTACHED;
 1342                 } else if (selected == LACP_UNSELECTED) {
 1343                         new_state = LACP_MUX_DETACHED;
 1344                 }
 1345                 break;
 1346         case LACP_MUX_ATTACHED:
 1347                 if (selected == LACP_SELECTED && p_sync) {
 1348                         new_state = LACP_MUX_COLLECTING;
 1349                 } else if (selected != LACP_SELECTED) {
 1350                         new_state = LACP_MUX_DETACHED;
 1351                 }
 1352                 break;
 1353         case LACP_MUX_COLLECTING:
 1354                 if (selected == LACP_SELECTED && p_sync && p_collecting) {
 1355                         new_state = LACP_MUX_DISTRIBUTING;
 1356                 } else if (selected != LACP_SELECTED || !p_sync) {
 1357                         new_state = LACP_MUX_ATTACHED;
 1358                 }
 1359                 break;
 1360         case LACP_MUX_DISTRIBUTING:
 1361                 if (selected != LACP_SELECTED || !p_sync || !p_collecting) {
 1362                         new_state = LACP_MUX_COLLECTING;
 1363                 }
 1364                 break;
 1365         default:
 1366                 panic("%s: unknown state", __func__);
 1367         }
 1368 
 1369         if (lp->lp_mux_state == new_state) {
 1370                 return;
 1371         }
 1372 
 1373         lacp_set_mux(lp, new_state);
 1374         goto re_eval;
 1375 }
 1376 
 1377 static void
 1378 lacp_set_mux(struct lacp_port *lp, enum lacp_mux_state new_state)
 1379 {
 1380         struct lacp_aggregator *la = lp->lp_aggregator;
 1381 
 1382         if (lp->lp_mux_state == new_state) {
 1383                 return;
 1384         }
 1385 
 1386         switch (new_state) {
 1387         case LACP_MUX_DETACHED:
 1388                 lp->lp_state &= ~LACP_STATE_SYNC;
 1389                 lacp_disable_distributing(lp);
 1390                 lacp_disable_collecting(lp);
 1391                 lacp_sm_assert_ntt(lp);
 1392                 /* cancel timer */
 1393                 if (LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE)) {
 1394                         KASSERT(la->la_pending > 0,
 1395                             ("timer_wait_while not active"));
 1396                         la->la_pending--;
 1397                 }
 1398                 LACP_TIMER_DISARM(lp, LACP_TIMER_WAIT_WHILE);
 1399                 lacp_unselect(lp);
 1400                 break;
 1401         case LACP_MUX_WAITING:
 1402                 LACP_TIMER_ARM(lp, LACP_TIMER_WAIT_WHILE,
 1403                     LACP_AGGREGATE_WAIT_TIME);
 1404                 la->la_pending++;
 1405                 break;
 1406         case LACP_MUX_ATTACHED:
 1407                 lp->lp_state |= LACP_STATE_SYNC;
 1408                 lacp_disable_collecting(lp);
 1409                 lacp_sm_assert_ntt(lp);
 1410                 break;
 1411         case LACP_MUX_COLLECTING:
 1412                 lacp_enable_collecting(lp);
 1413                 lacp_disable_distributing(lp);
 1414                 lacp_sm_assert_ntt(lp);
 1415                 break;
 1416         case LACP_MUX_DISTRIBUTING:
 1417                 lacp_enable_distributing(lp);
 1418                 break;
 1419         default:
 1420                 panic("%s: unknown state", __func__);
 1421         }
 1422 
 1423         LACP_DPRINTF((lp, "mux_state %d -> %d\n", lp->lp_mux_state, new_state));
 1424 
 1425         lp->lp_mux_state = new_state;
 1426 }
 1427 
 1428 static void
 1429 lacp_sm_mux_timer(struct lacp_port *lp)
 1430 {
 1431         struct lacp_aggregator *la = lp->lp_aggregator;
 1432         char buf[LACP_LAGIDSTR_MAX+1];
 1433 
 1434         KASSERT(la->la_pending > 0, ("no pending event"));
 1435 
 1436         LACP_DPRINTF((lp, "%s: aggregator %s, pending %d -> %d\n", __func__,
 1437             lacp_format_lagid(&la->la_actor, &la->la_partner,
 1438             buf, sizeof(buf)),
 1439             la->la_pending, la->la_pending - 1));
 1440 
 1441         la->la_pending--;
 1442 }
 1443 
 1444 /* periodic transmit machine */
 1445 
 1446 static void
 1447 lacp_sm_ptx_update_timeout(struct lacp_port *lp, uint8_t oldpstate)
 1448 {
 1449         if (LACP_STATE_EQ(oldpstate, lp->lp_partner.lip_state,
 1450             LACP_STATE_TIMEOUT)) {
 1451                 return;
 1452         }
 1453 
 1454         LACP_DPRINTF((lp, "partner timeout changed\n"));
 1455 
 1456         /*
 1457          * FAST_PERIODIC -> SLOW_PERIODIC
 1458          * or
 1459          * SLOW_PERIODIC (-> PERIODIC_TX) -> FAST_PERIODIC
 1460          *
 1461          * let lacp_sm_ptx_tx_schedule to update timeout.
 1462          */
 1463 
 1464         LACP_TIMER_DISARM(lp, LACP_TIMER_PERIODIC);
 1465 
 1466         /*
 1467          * if timeout has been shortened, assert NTT.
 1468          */
 1469 
 1470         if ((lp->lp_partner.lip_state & LACP_STATE_TIMEOUT)) {
 1471                 lacp_sm_assert_ntt(lp);
 1472         }
 1473 }
 1474 
 1475 static void
 1476 lacp_sm_ptx_tx_schedule(struct lacp_port *lp)
 1477 {
 1478         int timeout;
 1479 
 1480         if (!(lp->lp_state & LACP_STATE_ACTIVITY) &&
 1481             !(lp->lp_partner.lip_state & LACP_STATE_ACTIVITY)) {
 1482 
 1483                 /*
 1484                  * NO_PERIODIC
 1485                  */
 1486 
 1487                 LACP_TIMER_DISARM(lp, LACP_TIMER_PERIODIC);
 1488                 return;
 1489         }
 1490 
 1491         if (LACP_TIMER_ISARMED(lp, LACP_TIMER_PERIODIC)) {
 1492                 return;
 1493         }
 1494 
 1495         timeout = (lp->lp_partner.lip_state & LACP_STATE_TIMEOUT) ?
 1496             LACP_FAST_PERIODIC_TIME : LACP_SLOW_PERIODIC_TIME;
 1497 
 1498         LACP_TIMER_ARM(lp, LACP_TIMER_PERIODIC, timeout);
 1499 }
 1500 
 1501 static void
 1502 lacp_sm_ptx_timer(struct lacp_port *lp)
 1503 {
 1504         lacp_sm_assert_ntt(lp);
 1505 }
 1506 
 1507 static void
 1508 lacp_sm_rx(struct lacp_port *lp, const struct lacpdu *du)
 1509 {
 1510         int timeout;
 1511 
 1512         /*
 1513          * check LACP_DISABLED first
 1514          */
 1515 
 1516         if (!(lp->lp_state & LACP_STATE_AGGREGATION)) {
 1517                 return;
 1518         }
 1519 
 1520         /*
 1521          * check loopback condition.
 1522          */
 1523 
 1524         if (!lacp_compare_systemid(&du->ldu_actor.lip_systemid,
 1525             &lp->lp_actor.lip_systemid)) {
 1526                 return;
 1527         }
 1528 
 1529         /*
 1530          * EXPIRED, DEFAULTED, CURRENT -> CURRENT
 1531          */
 1532 
 1533         lacp_sm_rx_update_selected(lp, du);
 1534         lacp_sm_rx_update_ntt(lp, du);
 1535         lacp_sm_rx_record_pdu(lp, du);
 1536 
 1537         timeout = (lp->lp_state & LACP_STATE_TIMEOUT) ?
 1538             LACP_SHORT_TIMEOUT_TIME : LACP_LONG_TIMEOUT_TIME;
 1539         LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, timeout);
 1540 
 1541         lp->lp_state &= ~LACP_STATE_EXPIRED;
 1542 
 1543         /*
 1544          * kick transmit machine without waiting the next tick.
 1545          */
 1546 
 1547         lacp_sm_tx(lp);
 1548 }
 1549 
 1550 static void
 1551 lacp_sm_rx_set_expired(struct lacp_port *lp)
 1552 {
 1553         lp->lp_partner.lip_state &= ~LACP_STATE_SYNC;
 1554         lp->lp_partner.lip_state |= LACP_STATE_TIMEOUT;
 1555         LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, LACP_SHORT_TIMEOUT_TIME);
 1556         lp->lp_state |= LACP_STATE_EXPIRED;
 1557 }
 1558 
 1559 static void
 1560 lacp_sm_rx_timer(struct lacp_port *lp)
 1561 {
 1562         if ((lp->lp_state & LACP_STATE_EXPIRED) == 0) {
 1563                 /* CURRENT -> EXPIRED */
 1564                 LACP_DPRINTF((lp, "%s: CURRENT -> EXPIRED\n", __func__));
 1565                 lacp_sm_rx_set_expired(lp);
 1566         } else {
 1567                 /* EXPIRED -> DEFAULTED */
 1568                 LACP_DPRINTF((lp, "%s: EXPIRED -> DEFAULTED\n", __func__));
 1569                 lacp_sm_rx_update_default_selected(lp);
 1570                 lacp_sm_rx_record_default(lp);
 1571                 lp->lp_state &= ~LACP_STATE_EXPIRED;
 1572         }
 1573 }
 1574 
 1575 static void
 1576 lacp_sm_rx_record_pdu(struct lacp_port *lp, const struct lacpdu *du)
 1577 {
 1578         boolean_t active;
 1579         uint8_t oldpstate;
 1580         char buf[LACP_STATESTR_MAX+1];
 1581 
 1582         LACP_TRACE(lp);
 1583 
 1584         oldpstate = lp->lp_partner.lip_state;
 1585 
 1586         active = (du->ldu_actor.lip_state & LACP_STATE_ACTIVITY)
 1587             || ((lp->lp_state & LACP_STATE_ACTIVITY) &&
 1588             (du->ldu_partner.lip_state & LACP_STATE_ACTIVITY));
 1589 
 1590         lp->lp_partner = du->ldu_actor;
 1591         if (active &&
 1592             ((LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state,
 1593             LACP_STATE_AGGREGATION) &&
 1594             !lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner))
 1595             || (du->ldu_partner.lip_state & LACP_STATE_AGGREGATION) == 0)) {
 1596                 /* XXX nothing? */
 1597         } else {
 1598                 lp->lp_partner.lip_state &= ~LACP_STATE_SYNC;
 1599         }
 1600 
 1601         lp->lp_state &= ~LACP_STATE_DEFAULTED;
 1602 
 1603         if (oldpstate != lp->lp_partner.lip_state) {
 1604                 LACP_DPRINTF((lp, "old pstate %s\n",
 1605                     lacp_format_state(oldpstate, buf, sizeof(buf))));
 1606                 LACP_DPRINTF((lp, "new pstate %s\n",
 1607                     lacp_format_state(lp->lp_partner.lip_state, buf,
 1608                     sizeof(buf))));
 1609         }
 1610 
 1611         lacp_sm_ptx_update_timeout(lp, oldpstate);
 1612 }
 1613 
 1614 static void
 1615 lacp_sm_rx_update_ntt(struct lacp_port *lp, const struct lacpdu *du)
 1616 {
 1617 
 1618         LACP_TRACE(lp);
 1619 
 1620         if (lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner) ||
 1621             !LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state,
 1622             LACP_STATE_ACTIVITY | LACP_STATE_SYNC | LACP_STATE_AGGREGATION)) {
 1623                 LACP_DPRINTF((lp, "%s: assert ntt\n", __func__));
 1624                 lacp_sm_assert_ntt(lp);
 1625         }
 1626 }
 1627 
 1628 static void
 1629 lacp_sm_rx_record_default(struct lacp_port *lp)
 1630 {
 1631         uint8_t oldpstate;
 1632 
 1633         LACP_TRACE(lp);
 1634 
 1635         oldpstate = lp->lp_partner.lip_state;
 1636         lp->lp_partner = lacp_partner_admin;
 1637         lp->lp_state |= LACP_STATE_DEFAULTED;
 1638         lacp_sm_ptx_update_timeout(lp, oldpstate);
 1639 }
 1640 
 1641 static void
 1642 lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *lp,
 1643     const struct lacp_peerinfo *info)
 1644 {
 1645 
 1646         LACP_TRACE(lp);
 1647 
 1648         if (lacp_compare_peerinfo(&lp->lp_partner, info) ||
 1649             !LACP_STATE_EQ(lp->lp_partner.lip_state, info->lip_state,
 1650             LACP_STATE_AGGREGATION)) {
 1651                 lp->lp_selected = LACP_UNSELECTED;
 1652                 /* mux machine will clean up lp->lp_aggregator */
 1653         }
 1654 }
 1655 
 1656 static void
 1657 lacp_sm_rx_update_selected(struct lacp_port *lp, const struct lacpdu *du)
 1658 {
 1659 
 1660         LACP_TRACE(lp);
 1661 
 1662         lacp_sm_rx_update_selected_from_peerinfo(lp, &du->ldu_actor);
 1663 }
 1664 
 1665 static void
 1666 lacp_sm_rx_update_default_selected(struct lacp_port *lp)
 1667 {
 1668 
 1669         LACP_TRACE(lp);
 1670 
 1671         lacp_sm_rx_update_selected_from_peerinfo(lp, &lacp_partner_admin);
 1672 }
 1673 
 1674 /* transmit machine */
 1675 
 1676 static void
 1677 lacp_sm_tx(struct lacp_port *lp)
 1678 {
 1679         int error;
 1680 
 1681         if (!(lp->lp_state & LACP_STATE_AGGREGATION)
 1682 #if 1
 1683             || (!(lp->lp_state & LACP_STATE_ACTIVITY)
 1684             && !(lp->lp_partner.lip_state & LACP_STATE_ACTIVITY))
 1685 #endif
 1686             ) {
 1687                 lp->lp_flags &= ~LACP_PORT_NTT;
 1688         }
 1689 
 1690         if (!(lp->lp_flags & LACP_PORT_NTT)) {
 1691                 return;
 1692         }
 1693 
 1694         /* Rate limit to 3 PDUs per LACP_FAST_PERIODIC_TIME */
 1695         if (ppsratecheck(&lp->lp_last_lacpdu, &lp->lp_lacpdu_sent,
 1696                     (3 / LACP_FAST_PERIODIC_TIME)) == 0) {
 1697                 LACP_DPRINTF((lp, "rate limited pdu\n"));
 1698                 return;
 1699         }
 1700 
 1701         error = lacp_xmit_lacpdu(lp);
 1702 
 1703         if (error == 0) {
 1704                 lp->lp_flags &= ~LACP_PORT_NTT;
 1705         } else {
 1706                 LACP_DPRINTF((lp, "lacpdu transmit failure, error %d\n",
 1707                     error));
 1708         }
 1709 }
 1710 
 1711 static void
 1712 lacp_sm_assert_ntt(struct lacp_port *lp)
 1713 {
 1714 
 1715         lp->lp_flags |= LACP_PORT_NTT;
 1716 }
 1717 
 1718 static void
 1719 lacp_run_timers(struct lacp_port *lp)
 1720 {
 1721         int i;
 1722 
 1723         for (i = 0; i < LACP_NTIMER; i++) {
 1724                 KASSERT(lp->lp_timer[i] >= 0,
 1725                     ("invalid timer value %d", lp->lp_timer[i]));
 1726                 if (lp->lp_timer[i] == 0) {
 1727                         continue;
 1728                 } else if (--lp->lp_timer[i] <= 0) {
 1729                         if (lacp_timer_funcs[i]) {
 1730                                 (*lacp_timer_funcs[i])(lp);
 1731                         }
 1732                 }
 1733         }
 1734 }
 1735 
 1736 int
 1737 lacp_marker_input(struct lacp_port *lp, struct mbuf *m)
 1738 {
 1739         struct lacp_softc *lsc = lp->lp_lsc;
 1740         struct lagg_port *lgp = lp->lp_lagg;
 1741         struct lacp_port *lp2;
 1742         struct markerdu *mdu;
 1743         int error = 0;
 1744         int pending = 0;
 1745 
 1746         if (m->m_pkthdr.len != sizeof(*mdu)) {
 1747                 goto bad;
 1748         }
 1749 
 1750         if ((m->m_flags & M_MCAST) == 0) {
 1751                 goto bad;
 1752         }
 1753 
 1754         if (m->m_len < sizeof(*mdu)) {
 1755                 m = m_pullup(m, sizeof(*mdu));
 1756                 if (m == NULL) {
 1757                         return (ENOMEM);
 1758                 }
 1759         }
 1760 
 1761         mdu = mtod(m, struct markerdu *);
 1762 
 1763         if (memcmp(&mdu->mdu_eh.ether_dhost,
 1764             &ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN)) {
 1765                 goto bad;
 1766         }
 1767 
 1768         if (mdu->mdu_sph.sph_version != 1) {
 1769                 goto bad;
 1770         }
 1771 
 1772         switch (mdu->mdu_tlv.tlv_type) {
 1773         case MARKER_TYPE_INFO:
 1774                 if (tlv_check(mdu, sizeof(*mdu), &mdu->mdu_tlv,
 1775                     marker_info_tlv_template, TRUE)) {
 1776                         goto bad;
 1777                 }
 1778                 mdu->mdu_tlv.tlv_type = MARKER_TYPE_RESPONSE;
 1779                 memcpy(&mdu->mdu_eh.ether_dhost,
 1780                     &ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN);
 1781                 memcpy(&mdu->mdu_eh.ether_shost,
 1782                     lgp->lp_lladdr, ETHER_ADDR_LEN);
 1783                 error = lagg_enqueue(lp->lp_ifp, m);
 1784                 break;
 1785 
 1786         case MARKER_TYPE_RESPONSE:
 1787                 if (tlv_check(mdu, sizeof(*mdu), &mdu->mdu_tlv,
 1788                     marker_response_tlv_template, TRUE)) {
 1789                         goto bad;
 1790                 }
 1791                 LACP_DPRINTF((lp, "marker response, port=%u, sys=%6D, id=%u\n",
 1792                     ntohs(mdu->mdu_info.mi_rq_port), mdu->mdu_info.mi_rq_system,
 1793                     ":", ntohl(mdu->mdu_info.mi_rq_xid)));
 1794 
 1795                 /* Verify that it is the last marker we sent out */
 1796                 if (memcmp(&mdu->mdu_info, &lp->lp_marker,
 1797                     sizeof(struct lacp_markerinfo)))
 1798                         goto bad;
 1799 
 1800                 LACP_LOCK(lsc);
 1801                 lp->lp_flags &= ~LACP_PORT_MARK;
 1802 
 1803                 if (lsc->lsc_suppress_distributing) {
 1804                         /* Check if any ports are waiting for a response */
 1805                         LIST_FOREACH(lp2, &lsc->lsc_ports, lp_next) {
 1806                                 if (lp2->lp_flags & LACP_PORT_MARK) {
 1807                                         pending = 1;
 1808                                         break;
 1809                                 }
 1810                         }
 1811 
 1812                         if (pending == 0) {
 1813                                 /* All interface queues are clear */
 1814                                 LACP_DPRINTF((NULL, "queue flush complete\n"));
 1815                                 lsc->lsc_suppress_distributing = FALSE;
 1816                         }
 1817                 }
 1818                 LACP_UNLOCK(lsc);
 1819                 m_freem(m);
 1820                 break;
 1821 
 1822         default:
 1823                 goto bad;
 1824         }
 1825 
 1826         return (error);
 1827 
 1828 bad:
 1829         LACP_DPRINTF((lp, "bad marker frame\n"));
 1830         m_freem(m);
 1831         return (EINVAL);
 1832 }
 1833 
 1834 static int
 1835 tlv_check(const void *p, size_t size, const struct tlvhdr *tlv,
 1836     const struct tlv_template *tmpl, boolean_t check_type)
 1837 {
 1838         while (/* CONSTCOND */ 1) {
 1839                 if ((const char *)tlv - (const char *)p + sizeof(*tlv) > size) {
 1840                         return (EINVAL);
 1841                 }
 1842                 if ((check_type && tlv->tlv_type != tmpl->tmpl_type) ||
 1843                     tlv->tlv_length != tmpl->tmpl_length) {
 1844                         return (EINVAL);
 1845                 }
 1846                 if (tmpl->tmpl_type == 0) {
 1847                         break;
 1848                 }
 1849                 tlv = (const struct tlvhdr *)
 1850                     ((const char *)tlv + tlv->tlv_length);
 1851                 tmpl++;
 1852         }
 1853 
 1854         return (0);
 1855 }
 1856 
 1857 /* Debugging */
 1858 const char *
 1859 lacp_format_mac(const uint8_t *mac, char *buf, size_t buflen)
 1860 {
 1861         snprintf(buf, buflen, "%02X-%02X-%02X-%02X-%02X-%02X",
 1862             (int)mac[0],
 1863             (int)mac[1],
 1864             (int)mac[2],
 1865             (int)mac[3],
 1866             (int)mac[4],
 1867             (int)mac[5]);
 1868 
 1869         return (buf);
 1870 }
 1871 
 1872 const char *
 1873 lacp_format_systemid(const struct lacp_systemid *sysid,
 1874     char *buf, size_t buflen)
 1875 {
 1876         char macbuf[LACP_MACSTR_MAX+1];
 1877 
 1878         snprintf(buf, buflen, "%04X,%s",
 1879             ntohs(sysid->lsi_prio),
 1880             lacp_format_mac(sysid->lsi_mac, macbuf, sizeof(macbuf)));
 1881 
 1882         return (buf);
 1883 }
 1884 
 1885 const char *
 1886 lacp_format_portid(const struct lacp_portid *portid, char *buf, size_t buflen)
 1887 {
 1888         snprintf(buf, buflen, "%04X,%04X",
 1889             ntohs(portid->lpi_prio),
 1890             ntohs(portid->lpi_portno));
 1891 
 1892         return (buf);
 1893 }
 1894 
 1895 const char *
 1896 lacp_format_partner(const struct lacp_peerinfo *peer, char *buf, size_t buflen)
 1897 {
 1898         char sysid[LACP_SYSTEMIDSTR_MAX+1];
 1899         char portid[LACP_PORTIDSTR_MAX+1];
 1900 
 1901         snprintf(buf, buflen, "(%s,%04X,%s)",
 1902             lacp_format_systemid(&peer->lip_systemid, sysid, sizeof(sysid)),
 1903             ntohs(peer->lip_key),
 1904             lacp_format_portid(&peer->lip_portid, portid, sizeof(portid)));
 1905 
 1906         return (buf);
 1907 }
 1908 
 1909 const char *
 1910 lacp_format_lagid(const struct lacp_peerinfo *a,
 1911     const struct lacp_peerinfo *b, char *buf, size_t buflen)
 1912 {
 1913         char astr[LACP_PARTNERSTR_MAX+1];
 1914         char bstr[LACP_PARTNERSTR_MAX+1];
 1915 
 1916 #if 0
 1917         /*
 1918          * there's a convention to display small numbered peer
 1919          * in the left.
 1920          */
 1921 
 1922         if (lacp_compare_peerinfo(a, b) > 0) {
 1923                 const struct lacp_peerinfo *t;
 1924 
 1925                 t = a;
 1926                 a = b;
 1927                 b = t;
 1928         }
 1929 #endif
 1930 
 1931         snprintf(buf, buflen, "[%s,%s]",
 1932             lacp_format_partner(a, astr, sizeof(astr)),
 1933             lacp_format_partner(b, bstr, sizeof(bstr)));
 1934 
 1935         return (buf);
 1936 }
 1937 
 1938 const char *
 1939 lacp_format_lagid_aggregator(const struct lacp_aggregator *la,
 1940     char *buf, size_t buflen)
 1941 {
 1942         if (la == NULL) {
 1943                 return ("(none)");
 1944         }
 1945 
 1946         return (lacp_format_lagid(&la->la_actor, &la->la_partner, buf, buflen));
 1947 }
 1948 
 1949 const char *
 1950 lacp_format_state(uint8_t state, char *buf, size_t buflen)
 1951 {
 1952         snprintf(buf, buflen, "%b", state, LACP_STATE_BITS);
 1953         return (buf);
 1954 }
 1955 
 1956 static void
 1957 lacp_dump_lacpdu(const struct lacpdu *du)
 1958 {
 1959         char buf[LACP_PARTNERSTR_MAX+1];
 1960         char buf2[LACP_STATESTR_MAX+1];
 1961 
 1962         printf("actor=%s\n",
 1963             lacp_format_partner(&du->ldu_actor, buf, sizeof(buf)));
 1964         printf("actor.state=%s\n",
 1965             lacp_format_state(du->ldu_actor.lip_state, buf2, sizeof(buf2)));
 1966         printf("partner=%s\n",
 1967             lacp_format_partner(&du->ldu_partner, buf, sizeof(buf)));
 1968         printf("partner.state=%s\n",
 1969             lacp_format_state(du->ldu_partner.lip_state, buf2, sizeof(buf2)));
 1970 
 1971         printf("maxdelay=%d\n", ntohs(du->ldu_collector.lci_maxdelay));
 1972 }
 1973 
 1974 static void
 1975 lacp_dprintf(const struct lacp_port *lp, const char *fmt, ...)
 1976 {
 1977         va_list va;
 1978 
 1979         if (lp) {
 1980                 printf("%s: ", lp->lp_ifp->if_xname);
 1981         }
 1982 
 1983         va_start(va, fmt);
 1984         vprintf(fmt, va);
 1985         va_end(va);
 1986 }
Cache object: 6eb936498d96e32862be5ae328d48063
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FreeBSD/Linux Kernel Cross Reference sys/net/ieee8023ad_lacp.c

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