1 | /* $NetBSD: ieee8023ad_lacp_select.c,v 1.5 2007/02/22 06:20:16 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_select.c,v 1.5 2007/02/22 06:20:16 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/if_agrvar_impl.h> |
41 | #include <net/agr/ieee8023_slowprotocols.h> |
42 | #include <net/agr/ieee8023_tlv.h> |
43 | #include <net/agr/ieee8023ad_lacp.h> |
44 | #include <net/agr/ieee8023ad_lacp_impl.h> |
45 | #include <net/agr/ieee8023ad_impl.h> |
46 | #include <net/agr/ieee8023ad_lacp_debug.h> |
47 | |
48 | /* selection logic */ |
49 | |
50 | static void lacp_fill_aggregator_id(struct lacp_aggregator *, |
51 | const struct lacp_port *); |
52 | static void lacp_fill_aggregator_id_peer(struct lacp_peerinfo *, |
53 | const struct lacp_peerinfo *); |
54 | static bool lacp_aggregator_is_compatible(const struct lacp_aggregator *, |
55 | const struct lacp_port *); |
56 | static bool lacp_peerinfo_is_compatible(const struct lacp_peerinfo *, |
57 | const struct lacp_peerinfo *); |
58 | |
59 | static struct lacp_aggregator *lacp_aggregator_get(struct lacp_softc *, |
60 | struct lacp_port *); |
61 | static void lacp_aggregator_addref(struct lacp_softc *, |
62 | struct lacp_aggregator *); |
63 | static void lacp_aggregator_delref(struct lacp_softc *, |
64 | struct lacp_aggregator *); |
65 | |
66 | static void |
67 | lacp_aggregator_addref(struct lacp_softc *lsc, struct lacp_aggregator *la) |
68 | { |
69 | #if defined(LACP_DEBUG) |
70 | char buf[LACP_LAGIDSTR_MAX+1]; |
71 | #endif |
72 | |
73 | LACP_DPRINTF((NULL, "%s: lagid=%s, refcnt %d -> %d\n" , |
74 | __func__, |
75 | lacp_format_lagid(&la->la_actor, &la->la_partner, |
76 | buf, sizeof(buf)), |
77 | la->la_refcnt, la->la_refcnt + 1)); |
78 | |
79 | KASSERT(la->la_refcnt > 0); |
80 | la->la_refcnt++; |
81 | KASSERT(la->la_refcnt > la->la_nports); |
82 | } |
83 | |
84 | static void |
85 | lacp_aggregator_delref(struct lacp_softc *lsc, struct lacp_aggregator *la) |
86 | { |
87 | #if defined(LACP_DEBUG) |
88 | char buf[LACP_LAGIDSTR_MAX+1]; |
89 | #endif |
90 | |
91 | LACP_DPRINTF((NULL, "%s: lagid=%s, refcnt %d -> %d\n" , |
92 | __func__, |
93 | lacp_format_lagid(&la->la_actor, &la->la_partner, |
94 | buf, sizeof(buf)), |
95 | la->la_refcnt, la->la_refcnt - 1)); |
96 | |
97 | KASSERT(la->la_refcnt > la->la_nports); |
98 | la->la_refcnt--; |
99 | if (la->la_refcnt > 0) { |
100 | return; |
101 | } |
102 | |
103 | KASSERT(la->la_refcnt == 0); |
104 | KASSERT(lsc->lsc_active_aggregator != la); |
105 | |
106 | TAILQ_REMOVE(&lsc->lsc_aggregators, la, la_q); |
107 | |
108 | free(la, M_DEVBUF); |
109 | } |
110 | |
111 | /* |
112 | * lacp_aggregator_get: allocate an aggregator. |
113 | */ |
114 | |
115 | static struct lacp_aggregator * |
116 | lacp_aggregator_get(struct lacp_softc *lsc, struct lacp_port *lp) |
117 | { |
118 | struct lacp_aggregator *la; |
119 | |
120 | la = malloc(sizeof(*la), M_DEVBUF, M_NOWAIT); |
121 | if (la) { |
122 | la->la_refcnt = 1; |
123 | la->la_nports = 0; |
124 | TAILQ_INIT(&la->la_ports); |
125 | la->la_pending = 0; |
126 | TAILQ_INSERT_TAIL(&lsc->lsc_aggregators, la, la_q); |
127 | } |
128 | |
129 | return la; |
130 | } |
131 | |
132 | /* |
133 | * lacp_fill_aggregator_id: setup a newly allocated aggregator from a port. |
134 | */ |
135 | |
136 | static void |
137 | lacp_fill_aggregator_id(struct lacp_aggregator *la, const struct lacp_port *lp) |
138 | { |
139 | |
140 | lacp_fill_aggregator_id_peer(&la->la_partner, &lp->lp_partner); |
141 | lacp_fill_aggregator_id_peer(&la->la_actor, &lp->lp_actor); |
142 | |
143 | la->la_actor.lip_state = lp->lp_state & LACP_STATE_AGGREGATION; |
144 | } |
145 | |
146 | static void |
147 | lacp_fill_aggregator_id_peer(struct lacp_peerinfo *lpi_aggr, |
148 | const struct lacp_peerinfo *lpi_port) |
149 | { |
150 | |
151 | memset(lpi_aggr, 0, sizeof(*lpi_aggr)); |
152 | lpi_aggr->lip_systemid = lpi_port->lip_systemid; |
153 | lpi_aggr->lip_key = lpi_port->lip_key; |
154 | } |
155 | |
156 | /* |
157 | * lacp_aggregator_is_compatible: check if a port can join to an aggregator. |
158 | */ |
159 | |
160 | static bool |
161 | lacp_aggregator_is_compatible(const struct lacp_aggregator *la, |
162 | const struct lacp_port *lp) |
163 | { |
164 | |
165 | if (!(lp->lp_state & LACP_STATE_AGGREGATION) || |
166 | !(lp->lp_partner.lip_state & LACP_STATE_AGGREGATION)) { |
167 | return false; |
168 | } |
169 | |
170 | if (!(la->la_actor.lip_state & LACP_STATE_AGGREGATION)) { |
171 | return false; |
172 | } |
173 | |
174 | if (!lacp_peerinfo_is_compatible(&la->la_partner, &lp->lp_partner)) { |
175 | return false; |
176 | } |
177 | |
178 | if (!lacp_peerinfo_is_compatible(&la->la_actor, &lp->lp_actor)) { |
179 | return false; |
180 | } |
181 | |
182 | return true; |
183 | } |
184 | |
185 | static bool |
186 | lacp_peerinfo_is_compatible(const struct lacp_peerinfo *a, |
187 | const struct lacp_peerinfo *b) |
188 | { |
189 | |
190 | if (memcmp(&a->lip_systemid, &b->lip_systemid, |
191 | sizeof(a->lip_systemid))) { |
192 | return false; |
193 | } |
194 | |
195 | if (memcmp(&a->lip_key, &b->lip_key, sizeof(a->lip_key))) { |
196 | return false; |
197 | } |
198 | |
199 | return true; |
200 | } |
201 | |
202 | /* |
203 | * lacp_select: select an aggregator. create one if necessary. |
204 | */ |
205 | |
206 | void |
207 | lacp_select(struct lacp_port *lp) |
208 | { |
209 | struct lacp_softc *lsc = LACP_SOFTC(AGR_SC_FROM_PORT(lp->lp_agrport)); |
210 | struct lacp_aggregator *la; |
211 | #if defined(LACP_DEBUG) |
212 | char buf[LACP_LAGIDSTR_MAX+1]; |
213 | #endif |
214 | |
215 | if (lp->lp_aggregator) { |
216 | return; |
217 | } |
218 | |
219 | KASSERT(!LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE)); |
220 | |
221 | LACP_DPRINTF((lp, "port lagid=%s\n" , |
222 | lacp_format_lagid(&lp->lp_actor, &lp->lp_partner, |
223 | buf, sizeof(buf)))); |
224 | |
225 | TAILQ_FOREACH(la, &lsc->lsc_aggregators, la_q) { |
226 | if (lacp_aggregator_is_compatible(la, lp)) { |
227 | break; |
228 | } |
229 | } |
230 | |
231 | if (la == NULL) { |
232 | la = lacp_aggregator_get(lsc, lp); |
233 | if (la == NULL) { |
234 | LACP_DPRINTF((lp, "aggregator creation failed\n" )); |
235 | |
236 | /* |
237 | * will retry on the next tick. |
238 | */ |
239 | |
240 | return; |
241 | } |
242 | lacp_fill_aggregator_id(la, lp); |
243 | LACP_DPRINTF((lp, "aggregator created\n" )); |
244 | } else { |
245 | LACP_DPRINTF((lp, "compatible aggregator found\n" )); |
246 | lacp_aggregator_addref(lsc, la); |
247 | } |
248 | |
249 | LACP_DPRINTF((lp, "aggregator lagid=%s\n" , |
250 | lacp_format_lagid(&la->la_actor, &la->la_partner, |
251 | buf, sizeof(buf)))); |
252 | |
253 | lp->lp_aggregator = la; |
254 | lp->lp_selected = LACP_SELECTED; |
255 | } |
256 | |
257 | /* |
258 | * lacp_unselect: finish unselect/detach process. |
259 | */ |
260 | |
261 | void |
262 | lacp_unselect(struct lacp_port *lp) |
263 | { |
264 | struct lacp_softc *lsc = LACP_SOFTC(AGR_SC_FROM_PORT(lp->lp_agrport)); |
265 | struct lacp_aggregator *la = lp->lp_aggregator; |
266 | |
267 | KASSERT(!LACP_TIMER_ISARMED(lp, LACP_TIMER_WAIT_WHILE)); |
268 | |
269 | if (la == NULL) { |
270 | return; |
271 | } |
272 | |
273 | lp->lp_aggregator = NULL; |
274 | lacp_aggregator_delref(lsc, la); |
275 | } |
276 | |