| 1 | /* $NetBSD: ieee8023ad_lacp_sm_mux.c,v 1.4 2007/02/21 23:00:07 thorpej 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_sm_mux.c,v 1.4 2007/02/21 23:00:07 thorpej Exp $" ); |
| 31 | |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/callout.h> |
| 34 | #include <sys/mbuf.h> |
| 35 | #include <sys/systm.h> |
| 36 | |
| 37 | #include <net/if.h> |
| 38 | #include <net/if_ether.h> |
| 39 | |
| 40 | #include <net/agr/ieee8023_slowprotocols.h> |
| 41 | #include <net/agr/ieee8023_tlv.h> |
| 42 | #include <net/agr/ieee8023ad_lacp.h> |
| 43 | #include <net/agr/ieee8023ad_lacp_impl.h> |
| 44 | #include <net/agr/ieee8023ad_lacp_sm.h> |
| 45 | #include <net/agr/ieee8023ad_lacp_debug.h> |
| 46 | |
| 47 | /* mux machine */ |
| 48 | |
| 49 | void |
| 50 | lacp_sm_mux(struct lacp_port *lp) |
| 51 | { |
| 52 | enum lacp_mux_state new_state; |
| 53 | bool p_sync = |
| 54 | (lp->lp_partner.lip_state & LACP_STATE_SYNC) != 0; |
| 55 | bool p_collecting = |
| 56 | (lp->lp_partner.lip_state & LACP_STATE_COLLECTING) != 0; |
| 57 | enum lacp_selected selected = lp->lp_selected; |
| 58 | struct lacp_aggregator *la; |
| 59 | |
| 60 | /* LACP_DPRINTF((lp, "%s: state %d\n", __func__, lp->lp_mux_state)); */ |
| 61 | |
| 62 | re_eval: |
| 63 | la = lp->lp_aggregator; |
| 64 | KASSERT(lp->lp_mux_state == LACP_MUX_DETACHED || la != NULL); |
| 65 | new_state = lp->lp_mux_state; |
| 66 | switch (lp->lp_mux_state) { |
| 67 | case LACP_MUX_DETACHED: |
| 68 | if (selected != LACP_UNSELECTED) { |
| 69 | new_state = LACP_MUX_WAITING; |
| 70 | } |
| 71 | break; |
| 72 | case LACP_MUX_WAITING: |
| 73 | KASSERT(la->la_pending > 0 || |
| 74 | !LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE)); |
| 75 | if (selected == LACP_SELECTED && la->la_pending == 0) { |
| 76 | new_state = LACP_MUX_ATTACHED; |
| 77 | } else if (selected == LACP_UNSELECTED) { |
| 78 | new_state = LACP_MUX_DETACHED; |
| 79 | } |
| 80 | break; |
| 81 | case LACP_MUX_ATTACHED: |
| 82 | if (selected == LACP_SELECTED && p_sync) { |
| 83 | new_state = LACP_MUX_COLLECTING; |
| 84 | } else if (selected != LACP_SELECTED) { |
| 85 | new_state = LACP_MUX_DETACHED; |
| 86 | } |
| 87 | break; |
| 88 | case LACP_MUX_COLLECTING: |
| 89 | if (selected == LACP_SELECTED && p_sync && p_collecting) { |
| 90 | new_state = LACP_MUX_DISTRIBUTING; |
| 91 | } else if (selected != LACP_SELECTED || !p_sync) { |
| 92 | new_state = LACP_MUX_ATTACHED; |
| 93 | } |
| 94 | break; |
| 95 | case LACP_MUX_DISTRIBUTING: |
| 96 | if (selected != LACP_SELECTED || !p_sync || !p_collecting) { |
| 97 | new_state = LACP_MUX_COLLECTING; |
| 98 | } |
| 99 | break; |
| 100 | default: |
| 101 | panic("%s: unknown state" , __func__); |
| 102 | } |
| 103 | |
| 104 | if (lp->lp_mux_state == new_state) { |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | switch (new_state) { |
| 109 | case LACP_MUX_DETACHED: |
| 110 | lp->lp_state &= ~LACP_STATE_SYNC; |
| 111 | lacp_disable_distributing(lp); |
| 112 | lacp_disable_collecting(lp); |
| 113 | lacp_sm_assert_ntt(lp); |
| 114 | /* cancel timer */ |
| 115 | if (LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE)) { |
| 116 | KASSERT(la->la_pending > 0); |
| 117 | la->la_pending--; |
| 118 | } |
| 119 | LACP_TIMER_DISARM(lp, LACP_TIMER_WAIT_WHILE); |
| 120 | lacp_unselect(lp); |
| 121 | break; |
| 122 | case LACP_MUX_WAITING: |
| 123 | LACP_TIMER_ARM(lp, LACP_TIMER_WAIT_WHILE, |
| 124 | LACP_AGGREGATE_WAIT_TIME); |
| 125 | la->la_pending++; |
| 126 | break; |
| 127 | case LACP_MUX_ATTACHED: |
| 128 | lp->lp_state |= LACP_STATE_SYNC; |
| 129 | lacp_disable_collecting(lp); |
| 130 | lacp_sm_assert_ntt(lp); |
| 131 | break; |
| 132 | case LACP_MUX_COLLECTING: |
| 133 | lacp_enable_collecting(lp); |
| 134 | lp->lp_state |= LACP_STATE_COLLECTING; |
| 135 | lacp_disable_distributing(lp); |
| 136 | lacp_sm_assert_ntt(lp); |
| 137 | break; |
| 138 | case LACP_MUX_DISTRIBUTING: |
| 139 | lacp_enable_distributing(lp); |
| 140 | break; |
| 141 | default: |
| 142 | panic("%s: unknown state" , __func__); |
| 143 | } |
| 144 | |
| 145 | LACP_DPRINTF((lp, "mux_state %d -> %d\n" , lp->lp_mux_state, new_state)); |
| 146 | |
| 147 | lp->lp_mux_state = new_state; |
| 148 | goto re_eval; |
| 149 | } |
| 150 | |
| 151 | void |
| 152 | lacp_sm_mux_timer(struct lacp_port *lp) |
| 153 | { |
| 154 | struct lacp_aggregator *la = lp->lp_aggregator; |
| 155 | #if defined(LACP_DEBUG) |
| 156 | char buf[LACP_LAGIDSTR_MAX+1]; |
| 157 | #endif |
| 158 | |
| 159 | KASSERT(la); |
| 160 | KASSERT(la->la_pending > 0); |
| 161 | |
| 162 | LACP_DPRINTF((lp, "%s: aggregator %s, pending %d -> %d\n" , __func__, |
| 163 | lacp_format_lagid(&la->la_actor, &la->la_partner, |
| 164 | buf, sizeof(buf)), |
| 165 | la->la_pending, la->la_pending - 1)); |
| 166 | |
| 167 | la->la_pending--; |
| 168 | } |
| 169 | |