| 1 | /* $NetBSD: ieee8023ad_lacp.c,v 1.10 2011/07/01 02:46:24 joerg Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c)2005 YAMAMOTO Takashi, |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include <sys/cdefs.h> |
| 30 | __KERNEL_RCSID(0, "$NetBSD: ieee8023ad_lacp.c,v 1.10 2011/07/01 02:46:24 joerg Exp $" ); |
| 31 | |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/callout.h> |
| 34 | #include <sys/mbuf.h> |
| 35 | #include <sys/systm.h> |
| 36 | #include <sys/malloc.h> |
| 37 | #include <sys/kernel.h> /* hz */ |
| 38 | |
| 39 | #include <net/if.h> |
| 40 | #include <net/if_dl.h> |
| 41 | #include <net/if_ether.h> |
| 42 | #include <net/if_media.h> |
| 43 | |
| 44 | #include <net/agr/if_agrvar_impl.h> |
| 45 | #include <net/agr/if_agrsubr.h> |
| 46 | #include <net/agr/ieee8023_slowprotocols.h> |
| 47 | #include <net/agr/ieee8023_tlv.h> |
| 48 | #include <net/agr/ieee8023ad.h> |
| 49 | #include <net/agr/ieee8023ad_lacp.h> |
| 50 | #include <net/agr/ieee8023ad_lacp_impl.h> |
| 51 | #include <net/agr/ieee8023ad_impl.h> |
| 52 | #include <net/agr/ieee8023ad_lacp_sm.h> |
| 53 | #include <net/agr/ieee8023ad_lacp_debug.h> |
| 54 | |
| 55 | static void lacp_fill_actorinfo(struct agr_port *, struct lacp_peerinfo *); |
| 56 | |
| 57 | static uint64_t lacp_aggregator_bandwidth(struct lacp_aggregator *); |
| 58 | static void lacp_suppress_distributing(struct lacp_softc *, |
| 59 | struct lacp_aggregator *); |
| 60 | static void lacp_transit_expire(void *); |
| 61 | static void lacp_select_active_aggregator(struct lacp_softc *); |
| 62 | static uint16_t lacp_compose_key(struct lacp_port *); |
| 63 | |
| 64 | /* |
| 65 | * actor system priority and port priority. |
| 66 | * XXX should be configurable. |
| 67 | */ |
| 68 | |
| 69 | #define LACP_SYSTEM_PRIO 0x8000 |
| 70 | #define LACP_PORT_PRIO 0x8000 |
| 71 | |
| 72 | static const struct tlv_template lacp_info_tlv_template[] = { |
| 73 | { LACP_TYPE_ACTORINFO, |
| 74 | sizeof(struct tlvhdr) + sizeof(struct lacp_peerinfo) }, |
| 75 | { LACP_TYPE_PARTNERINFO, |
| 76 | sizeof(struct tlvhdr) + sizeof(struct lacp_peerinfo) }, |
| 77 | { LACP_TYPE_COLLECTORINFO, |
| 78 | sizeof(struct tlvhdr) + sizeof(struct lacp_collectorinfo) }, |
| 79 | { 0, 0 }, |
| 80 | }; |
| 81 | |
| 82 | /* |
| 83 | * ieee8023ad_lacp_input: process lacpdu |
| 84 | * |
| 85 | * => called from ether_input. (ie. at IPL_NET) |
| 86 | * |
| 87 | * XXX is it better to defer processing to lower IPL? |
| 88 | * XXX anyway input rate should be very low... |
| 89 | */ |
| 90 | |
| 91 | int |
| 92 | ieee8023ad_lacp_input(struct ifnet *ifp, struct mbuf *m) |
| 93 | { |
| 94 | struct lacpdu *du; |
| 95 | struct agr_softc *sc; |
| 96 | struct agr_port *port; |
| 97 | struct lacp_port *lp; |
| 98 | int error = 0; |
| 99 | |
| 100 | port = ifp->if_agrprivate; /* XXX race with agr_remport. */ |
| 101 | if (__predict_false(port->port_flags & AGRPORT_DETACHING)) { |
| 102 | goto bad; |
| 103 | } |
| 104 | |
| 105 | sc = AGR_SC_FROM_PORT(port); |
| 106 | KASSERT(port); |
| 107 | |
| 108 | /* running static config? */ |
| 109 | if (AGR_STATIC(sc)) { |
| 110 | /* static config, no lacp */ |
| 111 | goto bad; |
| 112 | } |
| 113 | |
| 114 | |
| 115 | if (m->m_pkthdr.len != sizeof(*du)) { |
| 116 | goto bad; |
| 117 | } |
| 118 | |
| 119 | if ((m->m_flags & M_MCAST) == 0) { |
| 120 | goto bad; |
| 121 | } |
| 122 | |
| 123 | if (m->m_len < sizeof(*du)) { |
| 124 | m = m_pullup(m, sizeof(*du)); |
| 125 | if (m == NULL) { |
| 126 | return ENOMEM; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | du = mtod(m, struct lacpdu *); |
| 131 | |
| 132 | if (memcmp(&du->ldu_eh.ether_dhost, |
| 133 | ðermulticastaddr_slowprotocols, ETHER_ADDR_LEN)) { |
| 134 | goto bad; |
| 135 | } |
| 136 | |
| 137 | KASSERT(du->ldu_sph.sph_subtype == SLOWPROTOCOLS_SUBTYPE_LACP); |
| 138 | |
| 139 | /* |
| 140 | * ignore the version for compatibility with |
| 141 | * the future protocol revisions. |
| 142 | */ |
| 143 | |
| 144 | #if 0 |
| 145 | if (du->ldu_sph.sph_version != 1) { |
| 146 | goto bad; |
| 147 | } |
| 148 | #endif |
| 149 | |
| 150 | /* |
| 151 | * ignore tlv types for compatibility with |
| 152 | * the future protocol revisions. |
| 153 | */ |
| 154 | |
| 155 | if (tlv_check(du, sizeof(*du), &du->ldu_tlv_actor, |
| 156 | lacp_info_tlv_template, false)) { |
| 157 | goto bad; |
| 158 | } |
| 159 | |
| 160 | AGR_LOCK(sc); |
| 161 | lp = LACP_PORT(port); |
| 162 | |
| 163 | #if defined(LACP_DEBUG) |
| 164 | if (lacpdebug) { |
| 165 | LACP_DPRINTF((lp, "lacpdu receive\n" )); |
| 166 | lacp_dump_lacpdu(du); |
| 167 | } |
| 168 | #endif /* defined(LACP_DEBUG) */ |
| 169 | lacp_sm_rx(lp, du); |
| 170 | |
| 171 | AGR_UNLOCK(sc); |
| 172 | |
| 173 | m_freem(m); |
| 174 | |
| 175 | return error; |
| 176 | |
| 177 | bad: |
| 178 | m_freem(m); |
| 179 | return EINVAL; |
| 180 | } |
| 181 | |
| 182 | static void |
| 183 | lacp_fill_actorinfo(struct agr_port *port, struct lacp_peerinfo *info) |
| 184 | { |
| 185 | struct lacp_port *lp = LACP_PORT(port); |
| 186 | |
| 187 | info->lip_systemid.lsi_prio = htobe16(LACP_SYSTEM_PRIO); |
| 188 | memcpy(&info->lip_systemid.lsi_mac, |
| 189 | CLLADDR(port->port_ifp->if_sadl), ETHER_ADDR_LEN); |
| 190 | info->lip_portid.lpi_prio = htobe16(LACP_PORT_PRIO); |
| 191 | info->lip_portid.lpi_portno = htobe16(port->port_ifp->if_index); |
| 192 | info->lip_state = lp->lp_state; |
| 193 | } |
| 194 | |
| 195 | int |
| 196 | lacp_xmit_lacpdu(struct lacp_port *lp) |
| 197 | { |
| 198 | struct agr_port *port = lp->lp_agrport; |
| 199 | struct mbuf *m; |
| 200 | struct lacpdu *du; |
| 201 | int error; |
| 202 | |
| 203 | /* running static config? */ |
| 204 | if (AGR_STATIC(AGR_SC_FROM_PORT(port))) { |
| 205 | /* static config, no lacp transmit */ |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | KDASSERT(MHLEN >= sizeof(*du)); |
| 210 | |
| 211 | m = m_gethdr(M_DONTWAIT, MT_DATA); |
| 212 | if (m == NULL) { |
| 213 | return ENOMEM; |
| 214 | } |
| 215 | m->m_len = m->m_pkthdr.len = sizeof(*du); |
| 216 | |
| 217 | du = mtod(m, struct lacpdu *); |
| 218 | memset(du, 0, sizeof(*du)); |
| 219 | |
| 220 | memcpy(&du->ldu_eh.ether_dhost, ethermulticastaddr_slowprotocols, |
| 221 | ETHER_ADDR_LEN); |
| 222 | memcpy(&du->ldu_eh.ether_shost, &port->port_origlladdr, ETHER_ADDR_LEN); |
| 223 | du->ldu_eh.ether_type = htobe16(ETHERTYPE_SLOWPROTOCOLS); |
| 224 | |
| 225 | du->ldu_sph.sph_subtype = SLOWPROTOCOLS_SUBTYPE_LACP; |
| 226 | du->ldu_sph.sph_version = 1; |
| 227 | |
| 228 | TLV_SET(&du->ldu_tlv_actor, LACP_TYPE_ACTORINFO, sizeof(du->ldu_actor)); |
| 229 | du->ldu_actor = lp->lp_actor; |
| 230 | |
| 231 | TLV_SET(&du->ldu_tlv_partner, LACP_TYPE_PARTNERINFO, |
| 232 | sizeof(du->ldu_partner)); |
| 233 | du->ldu_partner = lp->lp_partner; |
| 234 | |
| 235 | TLV_SET(&du->ldu_tlv_collector, LACP_TYPE_COLLECTORINFO, |
| 236 | sizeof(du->ldu_collector)); |
| 237 | du->ldu_collector.lci_maxdelay = 0; |
| 238 | |
| 239 | #if defined(LACP_DEBUG) |
| 240 | if (lacpdebug) { |
| 241 | LACP_DPRINTF((lp, "lacpdu transmit\n" )); |
| 242 | lacp_dump_lacpdu(du); |
| 243 | } |
| 244 | #endif /* defined(LACP_DEBUG) */ |
| 245 | |
| 246 | m->m_flags |= M_MCAST; |
| 247 | |
| 248 | /* |
| 249 | * XXX should use higher priority queue. |
| 250 | * otherwise network congestion can break aggregation. |
| 251 | */ |
| 252 | |
| 253 | error = agr_xmit_frame(port->port_ifp, m); |
| 254 | return error; |
| 255 | } |
| 256 | |
| 257 | void |
| 258 | ieee8023ad_lacp_portstate(struct agr_port *port) |
| 259 | { |
| 260 | struct lacp_port *lp = LACP_PORT(port); |
| 261 | u_int media = port->port_media; |
| 262 | uint8_t old_state; |
| 263 | uint16_t old_key; |
| 264 | |
| 265 | AGR_ASSERT_LOCKED(AGR_SC_FROM_PORT(port)); |
| 266 | |
| 267 | LACP_DPRINTF((lp, "media changed 0x%x -> 0x%x\n" , lp->lp_media, media)); |
| 268 | |
| 269 | old_state = lp->lp_state; |
| 270 | old_key = lp->lp_key; |
| 271 | |
| 272 | lp->lp_media = media; |
| 273 | if ((media & IFM_HDX) != 0) { |
| 274 | lp->lp_state &= ~LACP_STATE_AGGREGATION; |
| 275 | } else { |
| 276 | lp->lp_state |= LACP_STATE_AGGREGATION; |
| 277 | } |
| 278 | lp->lp_key = lacp_compose_key(lp); |
| 279 | |
| 280 | if (old_state != lp->lp_state || old_key != lp->lp_key) { |
| 281 | LACP_DPRINTF((lp, "-> UNSELECTED\n" )); |
| 282 | lp->lp_selected = LACP_UNSELECTED; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | void |
| 287 | ieee8023ad_lacp_porttick(struct agr_softc *sc, struct agr_port *port) |
| 288 | { |
| 289 | struct lacp_port *lp = LACP_PORT(port); |
| 290 | |
| 291 | AGR_ASSERT_LOCKED(sc); |
| 292 | |
| 293 | lacp_run_timers(lp); |
| 294 | |
| 295 | lacp_select(lp); |
| 296 | lacp_sm_mux(lp); |
| 297 | lacp_sm_tx(lp); |
| 298 | lacp_sm_ptx_tx_schedule(lp); |
| 299 | } |
| 300 | |
| 301 | void |
| 302 | lacp_portinit(struct agr_port *port) |
| 303 | { |
| 304 | struct lacp_port *lp = LACP_PORT(port); |
| 305 | bool active = true; /* XXX should be configurable */ |
| 306 | bool fast = false; /* XXX should be configurable */ |
| 307 | |
| 308 | lp->lp_agrport = port; |
| 309 | lacp_fill_actorinfo(port, &lp->lp_actor); |
| 310 | lp->lp_state = |
| 311 | (active ? LACP_STATE_ACTIVITY : 0) | |
| 312 | (fast ? LACP_STATE_TIMEOUT : 0); |
| 313 | lp->lp_aggregator = NULL; |
| 314 | lp->lp_media = port->port_media; /* XXX */ |
| 315 | lp->lp_key = lacp_compose_key(lp); |
| 316 | lacp_sm_rx_set_expired(lp); |
| 317 | } |
| 318 | |
| 319 | void |
| 320 | lacp_portfini(struct agr_port *port) |
| 321 | { |
| 322 | struct lacp_port *lp = LACP_PORT(port); |
| 323 | struct lacp_aggregator *la = lp->lp_aggregator; |
| 324 | int i; |
| 325 | |
| 326 | LACP_DPRINTF((lp, "portfini\n" )); |
| 327 | |
| 328 | for (i = 0; i < LACP_NTIMER; i++) { |
| 329 | LACP_TIMER_DISARM(lp, i); |
| 330 | } |
| 331 | |
| 332 | if (la == NULL) { |
| 333 | return; |
| 334 | } |
| 335 | |
| 336 | lacp_disable_distributing(lp); |
| 337 | lacp_unselect(lp); |
| 338 | } |
| 339 | |
| 340 | /* -------------------- */ |
| 341 | void |
| 342 | lacp_disable_collecting(struct lacp_port *lp) |
| 343 | { |
| 344 | struct agr_port *port = lp->lp_agrport; |
| 345 | |
| 346 | lp->lp_state &= ~LACP_STATE_COLLECTING; |
| 347 | port->port_flags &= ~AGRPORT_COLLECTING; |
| 348 | } |
| 349 | |
| 350 | void |
| 351 | lacp_enable_collecting(struct lacp_port *lp) |
| 352 | { |
| 353 | struct agr_port *port = lp->lp_agrport; |
| 354 | |
| 355 | lp->lp_state |= LACP_STATE_COLLECTING; |
| 356 | port->port_flags |= AGRPORT_COLLECTING; |
| 357 | } |
| 358 | |
| 359 | void |
| 360 | lacp_disable_distributing(struct lacp_port *lp) |
| 361 | { |
| 362 | struct agr_port *port = lp->lp_agrport; |
| 363 | struct lacp_aggregator *la = lp->lp_aggregator; |
| 364 | struct lacp_softc *lsc = LACP_SOFTC(AGR_SC_FROM_PORT(port)); |
| 365 | #if defined(LACP_DEBUG) |
| 366 | char buf[LACP_LAGIDSTR_MAX+1]; |
| 367 | #endif /* defined(LACP_DEBUG) */ |
| 368 | |
| 369 | if ((lp->lp_state & LACP_STATE_DISTRIBUTING) == 0) { |
| 370 | return; |
| 371 | } |
| 372 | |
| 373 | KASSERT(la); |
| 374 | KASSERT(!TAILQ_EMPTY(&la->la_ports)); |
| 375 | KASSERT(la->la_nports > 0); |
| 376 | KASSERT(la->la_refcnt >= la->la_nports); |
| 377 | |
| 378 | LACP_DPRINTF((lp, "disable distributing on aggregator %s, " |
| 379 | "nports %d -> %d\n" , |
| 380 | lacp_format_lagid_aggregator(la, buf, sizeof(buf)), |
| 381 | la->la_nports, la->la_nports - 1)); |
| 382 | |
| 383 | TAILQ_REMOVE(&la->la_ports, lp, lp_dist_q); |
| 384 | la->la_nports--; |
| 385 | |
| 386 | lacp_suppress_distributing(lsc, la); |
| 387 | |
| 388 | lp->lp_state &= ~LACP_STATE_DISTRIBUTING; |
| 389 | port->port_flags &= ~AGRPORT_DISTRIBUTING; |
| 390 | |
| 391 | if (lsc->lsc_active_aggregator == la) { |
| 392 | lacp_select_active_aggregator(lsc); |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | void |
| 397 | lacp_enable_distributing(struct lacp_port *lp) |
| 398 | { |
| 399 | struct agr_port *port = lp->lp_agrport; |
| 400 | struct lacp_aggregator *la = lp->lp_aggregator; |
| 401 | struct lacp_softc *lsc = LACP_SOFTC(AGR_SC_FROM_PORT(port)); |
| 402 | #if defined(LACP_DEBUG) |
| 403 | char buf[LACP_LAGIDSTR_MAX+1]; |
| 404 | #endif /* defined(LACP_DEBUG) */ |
| 405 | |
| 406 | if ((lp->lp_state & LACP_STATE_DISTRIBUTING) != 0) { |
| 407 | return; |
| 408 | } |
| 409 | |
| 410 | KASSERT(la); |
| 411 | |
| 412 | LACP_DPRINTF((lp, "enable distributing on aggregator %s, " |
| 413 | "nports %d -> %d\n" , |
| 414 | lacp_format_lagid_aggregator(la, buf, sizeof(buf)), |
| 415 | la->la_nports, la->la_nports + 1)); |
| 416 | |
| 417 | KASSERT(la->la_refcnt > la->la_nports); |
| 418 | TAILQ_INSERT_HEAD(&la->la_ports, lp, lp_dist_q); |
| 419 | la->la_nports++; |
| 420 | |
| 421 | lacp_suppress_distributing(lsc, la); |
| 422 | |
| 423 | lp->lp_state |= LACP_STATE_DISTRIBUTING; |
| 424 | port->port_flags |= AGRPORT_DISTRIBUTING; |
| 425 | |
| 426 | if (lsc->lsc_active_aggregator != la) { |
| 427 | lacp_select_active_aggregator(lsc); |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | static void |
| 432 | lacp_transit_expire(void *vp) |
| 433 | { |
| 434 | struct agr_softc *sc = vp; |
| 435 | struct lacp_softc *lsc = LACP_SOFTC(sc); |
| 436 | |
| 437 | AGR_LOCK(sc); |
| 438 | LACP_DPRINTF((NULL, "%s\n" , __func__)); |
| 439 | lsc->lsc_suppress_distributing = false; |
| 440 | AGR_UNLOCK(sc); |
| 441 | } |
| 442 | |
| 443 | /* -------------------- */ |
| 444 | /* XXX */ |
| 445 | void |
| 446 | ieee8023ad_portinit(struct agr_port *port) |
| 447 | { |
| 448 | struct ieee8023ad_port *iport = IEEE8023AD_PORT(port); |
| 449 | |
| 450 | memset(iport, 0, sizeof(*iport)); |
| 451 | |
| 452 | lacp_portinit(port); |
| 453 | } |
| 454 | |
| 455 | void |
| 456 | ieee8023ad_portfini(struct agr_port *port) |
| 457 | { |
| 458 | struct agr_softc *sc = AGR_SC_FROM_PORT(port); |
| 459 | |
| 460 | AGR_LOCK(sc); |
| 461 | |
| 462 | lacp_portfini(port); |
| 463 | |
| 464 | AGR_UNLOCK(sc); |
| 465 | } |
| 466 | |
| 467 | void |
| 468 | ieee8023ad_ctor(struct agr_softc *sc) |
| 469 | { |
| 470 | struct ieee8023ad_softc *isc = IEEE8023AD_SOFTC(sc); |
| 471 | struct lacp_softc *lsc = &isc->isc_lacpsc; |
| 472 | |
| 473 | lsc->lsc_active_aggregator = NULL; |
| 474 | TAILQ_INIT(&lsc->lsc_aggregators); |
| 475 | callout_init(&lsc->lsc_transit_callout, 0); |
| 476 | callout_setfunc(&lsc->lsc_transit_callout, lacp_transit_expire, sc); |
| 477 | } |
| 478 | |
| 479 | void |
| 480 | ieee8023ad_dtor(struct agr_softc *sc) |
| 481 | { |
| 482 | struct ieee8023ad_softc *isc = IEEE8023AD_SOFTC(sc); |
| 483 | struct lacp_softc *lsc = &isc->isc_lacpsc; |
| 484 | |
| 485 | LACP_DPRINTF((NULL, "%s\n" , __func__)); |
| 486 | |
| 487 | callout_stop(&lsc->lsc_transit_callout); |
| 488 | KASSERT(TAILQ_EMPTY(&lsc->lsc_aggregators)); |
| 489 | KASSERT(lsc->lsc_active_aggregator == NULL); |
| 490 | } |
| 491 | |
| 492 | /* -------------------- */ |
| 493 | |
| 494 | struct agr_port * |
| 495 | ieee8023ad_select_tx_port(struct agr_softc *sc, struct mbuf *m) |
| 496 | { |
| 497 | const struct lacp_softc *lsc = LACP_SOFTC(sc); |
| 498 | const struct lacp_aggregator *la; |
| 499 | const struct lacp_port *lp; |
| 500 | uint32_t hash; |
| 501 | int nports; |
| 502 | |
| 503 | if (__predict_false(lsc->lsc_suppress_distributing && |
| 504 | !AGR_ROUNDROBIN(sc))) { |
| 505 | LACP_DPRINTF((NULL, "%s: waiting transit\n" , __func__)); |
| 506 | sc->sc_if.if_collisions++; /* XXX abuse */ |
| 507 | return NULL; |
| 508 | } |
| 509 | |
| 510 | la = lsc->lsc_active_aggregator; |
| 511 | if (__predict_false(la == NULL)) { |
| 512 | LACP_DPRINTF((NULL, "%s: no active aggregator\n" , __func__)); |
| 513 | return NULL; |
| 514 | } |
| 515 | |
| 516 | nports = la->la_nports; |
| 517 | KASSERT(nports > 0); |
| 518 | |
| 519 | if (AGR_ROUNDROBIN(sc)) { |
| 520 | /* packet ordering rule violation */ |
| 521 | hash = sc->sc_rr_counter++; |
| 522 | } else { |
| 523 | hash = (*sc->sc_iftop->iftop_hashmbuf)(sc, m); |
| 524 | } |
| 525 | hash %= nports; |
| 526 | lp = TAILQ_FIRST(&la->la_ports); |
| 527 | KASSERT(lp != NULL); |
| 528 | while (hash--) { |
| 529 | lp = TAILQ_NEXT(lp, lp_dist_q); |
| 530 | KASSERT(lp != NULL); |
| 531 | } |
| 532 | |
| 533 | KASSERT((lp->lp_state & LACP_STATE_DISTRIBUTING) != 0); |
| 534 | |
| 535 | return lp->lp_agrport; |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * lacp_suppress_distributing: drop transmit packets for a while |
| 540 | * to preserve packet ordering. |
| 541 | */ |
| 542 | |
| 543 | static void |
| 544 | lacp_suppress_distributing(struct lacp_softc *lsc, struct lacp_aggregator *la) |
| 545 | { |
| 546 | |
| 547 | if (lsc->lsc_active_aggregator != la) { |
| 548 | return; |
| 549 | } |
| 550 | |
| 551 | LACP_DPRINTF((NULL, "%s\n" , __func__)); |
| 552 | lsc->lsc_suppress_distributing = true; |
| 553 | /* XXX should consider collector max delay */ |
| 554 | callout_schedule(&lsc->lsc_transit_callout, |
| 555 | LACP_TRANSIT_DELAY * hz / 1000); |
| 556 | } |
| 557 | |
| 558 | /* -------------------- */ |
| 559 | |
| 560 | int |
| 561 | lacp_compare_peerinfo(const struct lacp_peerinfo *a, |
| 562 | const struct lacp_peerinfo *b) |
| 563 | { |
| 564 | |
| 565 | return memcmp(a, b, offsetof(struct lacp_peerinfo, lip_state)); |
| 566 | } |
| 567 | |
| 568 | int |
| 569 | lacp_compare_systemid(const struct lacp_systemid *a, |
| 570 | const struct lacp_systemid *b) |
| 571 | { |
| 572 | |
| 573 | return memcmp(a, b, sizeof(*a)); |
| 574 | } |
| 575 | |
| 576 | int |
| 577 | lacp_compare_portid(const struct lacp_portid *a, |
| 578 | const struct lacp_portid *b) |
| 579 | { |
| 580 | |
| 581 | return memcmp(a, b, sizeof(*a)); |
| 582 | } |
| 583 | |
| 584 | /* -------------------- */ |
| 585 | |
| 586 | static uint64_t |
| 587 | lacp_aggregator_bandwidth(struct lacp_aggregator *la) |
| 588 | { |
| 589 | struct lacp_port *lp; |
| 590 | uint64_t speed; |
| 591 | |
| 592 | lp = TAILQ_FIRST(&la->la_ports); |
| 593 | if (lp == NULL) { |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | speed = ifmedia_baudrate(lp->lp_media); |
| 598 | speed *= la->la_nports; |
| 599 | if (speed == 0) { |
| 600 | LACP_DPRINTF((lp, "speed 0? media=0x%x nports=%d\n" , |
| 601 | lp->lp_media, la->la_nports)); |
| 602 | } |
| 603 | |
| 604 | return speed; |
| 605 | } |
| 606 | |
| 607 | /* |
| 608 | * lacp_select_active_aggregator: select an aggregator to be used to transmit |
| 609 | * packets from agr(4) interface. |
| 610 | */ |
| 611 | |
| 612 | static void |
| 613 | lacp_select_active_aggregator(struct lacp_softc *lsc) |
| 614 | { |
| 615 | struct lacp_aggregator *la; |
| 616 | struct lacp_aggregator *best_la = NULL; |
| 617 | uint64_t best_speed = 0; |
| 618 | #if defined(LACP_DEBUG) |
| 619 | char buf[LACP_LAGIDSTR_MAX+1]; |
| 620 | #endif /* defined(LACP_DEBUG) */ |
| 621 | |
| 622 | LACP_DPRINTF((NULL, "%s:\n" , __func__)); |
| 623 | |
| 624 | TAILQ_FOREACH(la, &lsc->lsc_aggregators, la_q) { |
| 625 | uint64_t speed; |
| 626 | |
| 627 | if (la->la_nports == 0) { |
| 628 | continue; |
| 629 | } |
| 630 | |
| 631 | speed = lacp_aggregator_bandwidth(la); |
| 632 | LACP_DPRINTF((NULL, "%s, speed=%" PRIu64 ", nports=%d\n" , |
| 633 | lacp_format_lagid_aggregator(la, buf, sizeof(buf)), |
| 634 | speed, la->la_nports)); |
| 635 | if (speed > best_speed || |
| 636 | (speed == best_speed && |
| 637 | la == lsc->lsc_active_aggregator)) { |
| 638 | best_la = la; |
| 639 | best_speed = speed; |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | KASSERT(best_la == NULL || best_la->la_nports > 0); |
| 644 | KASSERT(best_la == NULL || !TAILQ_EMPTY(&best_la->la_ports)); |
| 645 | |
| 646 | #if defined(LACP_DEBUG) |
| 647 | if (lsc->lsc_active_aggregator != best_la) { |
| 648 | LACP_DPRINTF((NULL, "active aggregator changed\n" )); |
| 649 | LACP_DPRINTF((NULL, "old %s\n" , |
| 650 | lacp_format_lagid_aggregator(lsc->lsc_active_aggregator, |
| 651 | buf, sizeof(buf)))); |
| 652 | } else { |
| 653 | LACP_DPRINTF((NULL, "active aggregator not changed\n" )); |
| 654 | } |
| 655 | LACP_DPRINTF((NULL, "new %s\n" , |
| 656 | lacp_format_lagid_aggregator(best_la, buf, sizeof(buf)))); |
| 657 | #endif /* defined(LACP_DEBUG) */ |
| 658 | |
| 659 | if (lsc->lsc_active_aggregator != best_la) { |
| 660 | lsc->lsc_active_aggregator = best_la; |
| 661 | if (best_la) { |
| 662 | lacp_suppress_distributing(lsc, best_la); |
| 663 | } |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | uint16_t |
| 668 | lacp_compose_key(struct lacp_port *lp) |
| 669 | { |
| 670 | u_int media = lp->lp_media; |
| 671 | uint16_t key; |
| 672 | |
| 673 | KASSERT(IFM_TYPE(media) == IFM_ETHER); |
| 674 | |
| 675 | if (!(lp->lp_state & LACP_STATE_AGGREGATION)) { |
| 676 | |
| 677 | /* |
| 678 | * non-aggregatable links should have unique keys. |
| 679 | * |
| 680 | * XXX this isn't really unique as if_index is 16 bit. |
| 681 | */ |
| 682 | |
| 683 | /* bit 0..14: (some bits of) if_index of this port */ |
| 684 | key = lp->lp_agrport->port_ifp->if_index; |
| 685 | /* bit 15: 1 */ |
| 686 | key |= 0x8000; |
| 687 | } else { |
| 688 | u_int subtype = IFM_SUBTYPE(media); |
| 689 | |
| 690 | KASSERT((media & IFM_HDX) == 0); /* should be handled above */ |
| 691 | KASSERT((subtype & 0x1f) == subtype); |
| 692 | |
| 693 | /* bit 0..4: IFM_SUBTYPE */ |
| 694 | key = subtype; |
| 695 | /* bit 5..14: (some bits of) if_index of agr device */ |
| 696 | key |= 0x7fe0 & ((lp->lp_agrport->port_agrifp->if_index) << 5); |
| 697 | /* bit 15: 0 */ |
| 698 | } |
| 699 | |
| 700 | return htobe16(key); |
| 701 | } |
| 702 | |