| 1 | /* $NetBSD: ieee8023ad_lacp_sm_rx.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_rx.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 | /* receive machine */ |
| 48 | |
| 49 | static void lacp_sm_rx_update_ntt(struct lacp_port *, const struct lacpdu *); |
| 50 | static void lacp_sm_rx_record_pdu(struct lacp_port *, const struct lacpdu *); |
| 51 | static void lacp_sm_rx_update_selected(struct lacp_port *, const struct lacpdu *); |
| 52 | |
| 53 | static void lacp_sm_rx_record_default(struct lacp_port *); |
| 54 | static void lacp_sm_rx_update_default_selected(struct lacp_port *); |
| 55 | |
| 56 | static void lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *, |
| 57 | const struct lacp_peerinfo *); |
| 58 | |
| 59 | /* |
| 60 | * partner administration variables. |
| 61 | * XXX should be configurable. |
| 62 | */ |
| 63 | |
| 64 | static const struct lacp_peerinfo lacp_partner_admin = { |
| 65 | .lip_systemid = { .lsi_prio = 0xffff }, |
| 66 | .lip_portid = { .lpi_prio = 0xffff }, |
| 67 | #if 1 |
| 68 | /* optimistic */ |
| 69 | .lip_state = LACP_STATE_SYNC | LACP_STATE_AGGREGATION | |
| 70 | LACP_STATE_COLLECTING | LACP_STATE_DISTRIBUTING, |
| 71 | #else |
| 72 | /* pessimistic */ |
| 73 | .lip_state = 0, |
| 74 | #endif |
| 75 | }; |
| 76 | |
| 77 | void |
| 78 | lacp_sm_rx(struct lacp_port *lp, const struct lacpdu *du) |
| 79 | { |
| 80 | int timeout; |
| 81 | |
| 82 | /* |
| 83 | * check LACP_DISABLED first |
| 84 | */ |
| 85 | |
| 86 | if (!(lp->lp_state & LACP_STATE_AGGREGATION)) { |
| 87 | return; |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * check loopback condition. |
| 92 | */ |
| 93 | |
| 94 | if (!lacp_compare_systemid(&du->ldu_actor.lip_systemid, |
| 95 | &lp->lp_actor.lip_systemid)) { |
| 96 | return; |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * EXPIRED, DEFAULTED, CURRENT -> CURRENT |
| 101 | */ |
| 102 | |
| 103 | lacp_sm_rx_update_selected(lp, du); |
| 104 | lacp_sm_rx_update_ntt(lp, du); |
| 105 | lacp_sm_rx_record_pdu(lp, du); |
| 106 | |
| 107 | timeout = (lp->lp_state & LACP_STATE_TIMEOUT) ? |
| 108 | LACP_SHORT_TIMEOUT_TIME : LACP_LONG_TIMEOUT_TIME; |
| 109 | LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, timeout); |
| 110 | |
| 111 | lp->lp_state &= ~LACP_STATE_EXPIRED; |
| 112 | |
| 113 | /* |
| 114 | * kick transmit machine without waiting the next tick. |
| 115 | */ |
| 116 | |
| 117 | lacp_sm_tx(lp); |
| 118 | } |
| 119 | |
| 120 | void |
| 121 | lacp_sm_rx_set_expired(struct lacp_port *lp) |
| 122 | { |
| 123 | |
| 124 | lp->lp_partner.lip_state &= ~LACP_STATE_SYNC; |
| 125 | lp->lp_partner.lip_state |= LACP_STATE_TIMEOUT; |
| 126 | LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, LACP_SHORT_TIMEOUT_TIME); |
| 127 | lp->lp_state |= LACP_STATE_EXPIRED; |
| 128 | } |
| 129 | |
| 130 | void |
| 131 | lacp_sm_rx_timer(struct lacp_port *lp) |
| 132 | { |
| 133 | |
| 134 | if ((lp->lp_state & LACP_STATE_EXPIRED) == 0) { |
| 135 | /* CURRENT -> EXPIRED */ |
| 136 | LACP_DPRINTF((lp, "%s: CURRENT -> EXPIRED\n" , __func__)); |
| 137 | lacp_sm_rx_set_expired(lp); |
| 138 | } else { |
| 139 | /* EXPIRED -> DEFAULTED */ |
| 140 | LACP_DPRINTF((lp, "%s: EXPIRED -> DEFAULTED\n" , __func__)); |
| 141 | lacp_sm_rx_update_default_selected(lp); |
| 142 | lacp_sm_rx_record_default(lp); |
| 143 | lp->lp_state &= ~LACP_STATE_EXPIRED; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | static void |
| 148 | lacp_sm_rx_record_pdu(struct lacp_port *lp, const struct lacpdu *du) |
| 149 | { |
| 150 | bool active; |
| 151 | uint8_t oldpstate; |
| 152 | #if defined(LACP_DEBUG) |
| 153 | char buf[LACP_STATESTR_MAX+1]; |
| 154 | #endif |
| 155 | |
| 156 | /* LACP_DPRINTF((lp, "%s\n", __func__)); */ |
| 157 | |
| 158 | oldpstate = lp->lp_partner.lip_state; |
| 159 | |
| 160 | active = (du->ldu_actor.lip_state & LACP_STATE_ACTIVITY) |
| 161 | || ((lp->lp_state & LACP_STATE_ACTIVITY) && |
| 162 | (du->ldu_partner.lip_state & LACP_STATE_ACTIVITY)); |
| 163 | |
| 164 | lp->lp_partner = du->ldu_actor; |
| 165 | if (active && |
| 166 | ((LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state, |
| 167 | LACP_STATE_AGGREGATION) && |
| 168 | !lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner)) |
| 169 | || (du->ldu_partner.lip_state & LACP_STATE_AGGREGATION) == 0)) { |
| 170 | /* nothing */ |
| 171 | } else { |
| 172 | lp->lp_partner.lip_state &= ~LACP_STATE_SYNC; |
| 173 | } |
| 174 | |
| 175 | lp->lp_state &= ~LACP_STATE_DEFAULTED; |
| 176 | |
| 177 | LACP_DPRINTF((lp, "old pstate %s\n" , |
| 178 | lacp_format_state(oldpstate, buf, sizeof(buf)))); |
| 179 | LACP_DPRINTF((lp, "new pstate %s\n" , |
| 180 | lacp_format_state(lp->lp_partner.lip_state, buf, sizeof(buf)))); |
| 181 | |
| 182 | lacp_sm_ptx_update_timeout(lp, oldpstate); |
| 183 | } |
| 184 | |
| 185 | static void |
| 186 | lacp_sm_rx_update_ntt(struct lacp_port *lp, const struct lacpdu *du) |
| 187 | { |
| 188 | |
| 189 | /* LACP_DPRINTF((lp, "%s\n", __func__)); */ |
| 190 | |
| 191 | if (lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner) || |
| 192 | !LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state, |
| 193 | LACP_STATE_ACTIVITY | LACP_STATE_SYNC | LACP_STATE_AGGREGATION)) { |
| 194 | LACP_DPRINTF((lp, "%s: assert ntt\n" , __func__)); |
| 195 | lacp_sm_assert_ntt(lp); |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | static void |
| 200 | lacp_sm_rx_record_default(struct lacp_port *lp) |
| 201 | { |
| 202 | uint8_t oldpstate; |
| 203 | |
| 204 | /* LACP_DPRINTF((lp, "%s\n", __func__)); */ |
| 205 | |
| 206 | oldpstate = lp->lp_partner.lip_state; |
| 207 | lp->lp_partner = lacp_partner_admin; |
| 208 | lp->lp_state |= LACP_STATE_DEFAULTED; |
| 209 | lacp_sm_ptx_update_timeout(lp, oldpstate); |
| 210 | } |
| 211 | |
| 212 | static void |
| 213 | lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *lp, |
| 214 | const struct lacp_peerinfo *info) |
| 215 | { |
| 216 | |
| 217 | /* LACP_DPRINTF((lp, "%s\n", __func__)); */ |
| 218 | |
| 219 | if (lacp_compare_peerinfo(&lp->lp_partner, info) || |
| 220 | !LACP_STATE_EQ(lp->lp_partner.lip_state, info->lip_state, |
| 221 | LACP_STATE_AGGREGATION)) { |
| 222 | lp->lp_selected = LACP_UNSELECTED; |
| 223 | /* mux machine will clean up lp->lp_aggregator */ |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | static void |
| 228 | lacp_sm_rx_update_selected(struct lacp_port *lp, const struct lacpdu *du) |
| 229 | { |
| 230 | |
| 231 | /* LACP_DPRINTF((lp, "%s\n", __func__)); */ |
| 232 | |
| 233 | lacp_sm_rx_update_selected_from_peerinfo(lp, &du->ldu_actor); |
| 234 | } |
| 235 | |
| 236 | static void |
| 237 | lacp_sm_rx_update_default_selected(struct lacp_port *lp) |
| 238 | { |
| 239 | |
| 240 | /* LACP_DPRINTF((lp, "%s\n", __func__)); */ |
| 241 | |
| 242 | lacp_sm_rx_update_selected_from_peerinfo(lp, &lacp_partner_admin); |
| 243 | } |
| 244 | |