1 /* $NetBSD: ieee80211_rssadapt.c,v 1.21 2016/09/27 20:20:06 christos Exp $ */ 2 /*- 3 * Copyright (c) 2003, 2004 David Young. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or 6 * without modification, are permitted provided that the following 7 * conditions are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following 12 * disclaimer in the documentation and/or other materials provided 13 * with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 17 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 18 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL David 19 * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 21 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 26 * OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #ifdef __NetBSD__ 31 __KERNEL_RCSID(0, "$NetBSD: ieee80211_rssadapt.c,v 1.21 2016/09/27 20:20:06 christos Exp $"); 32 #endif 33 34 #include <sys/param.h> 35 #include <sys/types.h> 36 #include <sys/kernel.h> /* for hz */ 37 #include <sys/sysctl.h> 38 39 #include <net/if.h> 40 #include <net/if_media.h> 41 #include <net/if_ether.h> 42 43 #include <net80211/ieee80211_netbsd.h> 44 #include <net80211/ieee80211_var.h> 45 #include <net80211/ieee80211.h> 46 #include <net80211/ieee80211_rssadapt.h> 47 48 #ifdef interpolate 49 #undef interpolate 50 #endif 51 #define interpolate(parm, old, new) ((parm##_old * (old) + \ 52 (parm##_denom - parm##_old) * (new)) / \ 53 parm##_denom) 54 55 #ifdef IEEE80211_DEBUG 56 static struct timeval lastrateadapt; /* time of last rate adaptation msg */ 57 static int currssadaptps = 0; /* rate-adaptation msgs this second */ 58 static int ieee80211_adaptrate = 4; /* rate-adaptation max msgs/sec */ 59 60 #define RSSADAPT_DO_PRINT() \ 61 ((ieee80211_rssadapt_debug > 0) && \ 62 ppsratecheck(&lastrateadapt, &currssadaptps, ieee80211_adaptrate)) 63 #define RSSADAPT_PRINTF(X) \ 64 if (RSSADAPT_DO_PRINT()) \ 65 printf X 66 67 int ieee80211_rssadapt_debug = 0; 68 69 #else 70 #define RSSADAPT_DO_PRINT() (0) 71 #define RSSADAPT_PRINTF(X) 72 #endif 73 74 static struct ieee80211_rssadapt_expavgctl master_expavgctl = { 75 .rc_decay_denom = 16, 76 .rc_decay_old = 15, 77 .rc_thresh_denom = 8, 78 .rc_thresh_old = 4, 79 .rc_avgrssi_denom = 8, 80 .rc_avgrssi_old = 4 81 }; 82 83 #ifdef __NetBSD__ 84 #ifdef IEEE80211_DEBUG 85 /* TBD factor with sysctl_ath_verify, sysctl_ieee80211_verify. */ 86 static int 87 sysctl_ieee80211_rssadapt_debug(SYSCTLFN_ARGS) 88 { 89 int error, t; 90 struct sysctlnode node; 91 92 node = *rnode; 93 t = *(int*)rnode->sysctl_data; 94 node.sysctl_data = &t; 95 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 96 if (error || newp == NULL) 97 return (error); 98 99 if (t < 0 || t > 2) 100 return (EINVAL); 101 *(int*)rnode->sysctl_data = t; 102 103 return (0); 104 } 105 #endif /* IEEE80211_DEBUG */ 106 107 /* TBD factor with sysctl_ath_verify, sysctl_ieee80211_verify. */ 108 static int 109 sysctl_ieee80211_rssadapt_expavgctl(SYSCTLFN_ARGS) 110 { 111 struct ieee80211_rssadapt_expavgctl rc; 112 int error; 113 struct sysctlnode node; 114 115 node = *rnode; 116 rc = *(struct ieee80211_rssadapt_expavgctl *)rnode->sysctl_data; 117 node.sysctl_data = &rc; 118 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 119 if (error || newp == NULL) 120 return (error); 121 122 if (/* rc.rc_decay_old < 0 || */ 123 rc.rc_decay_denom < rc.rc_decay_old) 124 return (EINVAL); 125 126 if (/* rc.rc_thresh_old < 0 || */ 127 rc.rc_thresh_denom < rc.rc_thresh_old) 128 return (EINVAL); 129 130 if (/* rc.rc_avgrssi_old < 0 || */ 131 rc.rc_avgrssi_denom < rc.rc_avgrssi_old) 132 return (EINVAL); 133 134 *(struct ieee80211_rssadapt_expavgctl *)rnode->sysctl_data = rc; 135 136 return (0); 137 } 138 139 /* 140 * Setup sysctl(3) MIB, net.ieee80211.* 141 * 142 * TBD condition CTLFLAG_PERMANENT on being a module or not 143 */ 144 void 145 ieee80211_rssadapt_sysctl_setup(struct sysctllog **clog) 146 { 147 int rc; 148 const struct sysctlnode *node; 149 150 if ((rc = sysctl_createv(clog, 0, NULL, &node, 151 CTLFLAG_PERMANENT, CTLTYPE_NODE, "link", NULL, 152 NULL, 0, NULL, 0, CTL_NET, PF_LINK, CTL_EOL)) != 0) 153 goto err; 154 155 if ((rc = sysctl_createv(clog, 0, &node, &node, 156 CTLFLAG_PERMANENT, CTLTYPE_NODE, "ieee80211", NULL, 157 NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL)) != 0) 158 goto err; 159 160 if ((rc = sysctl_createv(clog, 0, &node, &node, 161 CTLFLAG_PERMANENT, CTLTYPE_NODE, "rssadapt", 162 SYSCTL_DESCR("Received Signal Strength adaptation controls"), 163 NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL)) != 0) 164 goto err; 165 166 #ifdef IEEE80211_DEBUG 167 /* control debugging printfs */ 168 if ((rc = sysctl_createv(clog, 0, &node, NULL, 169 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "debug", 170 SYSCTL_DESCR("Enable RSS adaptation debugging output"), 171 sysctl_ieee80211_rssadapt_debug, 0, &ieee80211_rssadapt_debug, 0, 172 CTL_CREATE, CTL_EOL)) != 0) 173 goto err; 174 #endif /* IEEE80211_DEBUG */ 175 176 /* control rate of decay for exponential averages */ 177 if ((rc = sysctl_createv(clog, 0, &node, NULL, 178 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRUCT, 179 "expavgctl", SYSCTL_DESCR("RSS exponential averaging control"), 180 sysctl_ieee80211_rssadapt_expavgctl, 0, 181 &master_expavgctl, sizeof(master_expavgctl), CTL_CREATE, 182 CTL_EOL)) != 0) 183 goto err; 184 185 return; 186 err: 187 printf("%s: sysctl_createv failed (rc = %d)\n", __func__, rc); 188 } 189 #endif /* __NetBSD__ */ 190 191 int 192 ieee80211_rssadapt_choose(struct ieee80211_rssadapt *ra, 193 struct ieee80211_rateset *rs, struct ieee80211_frame *wh, u_int len, 194 int fixed_rate, const char *dvname, int do_not_adapt) 195 { 196 u_int16_t (*thrs)[IEEE80211_RATE_SIZE]; 197 int flags = 0, i, rateidx = 0, thridx, top; 198 199 if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) 200 flags |= IEEE80211_RATE_BASIC; 201 202 for (i = 0, top = IEEE80211_RSSADAPT_BKT0; 203 i < IEEE80211_RSSADAPT_BKTS; 204 i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) { 205 thridx = i; 206 if (len <= top) 207 break; 208 } 209 210 thrs = &ra->ra_rate_thresh[thridx]; 211 212 if (fixed_rate != -1) { 213 if ((rs->rs_rates[fixed_rate] & flags) == flags) { 214 rateidx = fixed_rate; 215 goto out; 216 } 217 flags |= IEEE80211_RATE_BASIC; 218 i = fixed_rate; 219 } else 220 i = rs->rs_nrates; 221 222 while (--i >= 0) { 223 rateidx = i; 224 if ((rs->rs_rates[i] & flags) != flags) 225 continue; 226 if (do_not_adapt) 227 break; 228 if ((*thrs)[i] < ra->ra_avg_rssi) 229 break; 230 } 231 232 out: 233 #ifdef IEEE80211_DEBUG 234 if (ieee80211_rssadapt_debug && dvname != NULL) { 235 printf("%s: dst %s threshold[%d, %d.%d] %d < %d\n", 236 dvname, ether_sprintf(wh->i_addr1), len, 237 (rs->rs_rates[rateidx] & IEEE80211_RATE_VAL) / 2, 238 (rs->rs_rates[rateidx] & IEEE80211_RATE_VAL) * 5 % 10, 239 (*thrs)[rateidx], ra->ra_avg_rssi); 240 } 241 #endif /* IEEE80211_DEBUG */ 242 return rateidx; 243 } 244 245 void 246 ieee80211_rssadapt_updatestats(struct ieee80211_rssadapt *ra) 247 { 248 long interval; 249 250 ra->ra_pktrate = 251 (ra->ra_pktrate + 10 * (ra->ra_nfail + ra->ra_nok)) / 2; 252 ra->ra_nfail = ra->ra_nok = 0; 253 254 /* a node is eligible for its rate to be raised every 1/10 to 10 255 * seconds, more eligible in proportion to recent packet rates. 256 */ 257 interval = MAX(100000, 10000000 / MAX(1, 10 * ra->ra_pktrate)); 258 ra->ra_raise_interval.tv_sec = interval / (1000 * 1000); 259 ra->ra_raise_interval.tv_usec = interval % (1000 * 1000); 260 } 261 262 void 263 ieee80211_rssadapt_input(struct ieee80211com *ic, struct ieee80211_node *ni, 264 struct ieee80211_rssadapt *ra, int rssi) 265 { 266 #ifdef IEEE80211_DEBUG 267 int last_avg_rssi = ra->ra_avg_rssi; 268 #endif 269 270 ra->ra_avg_rssi = interpolate(master_expavgctl.rc_avgrssi, 271 ra->ra_avg_rssi, (rssi << 8)); 272 273 RSSADAPT_PRINTF(("%s: src %s rssi %d avg %d -> %d\n", 274 ic->ic_ifp->if_xname, ether_sprintf(ni->ni_macaddr), 275 rssi, last_avg_rssi, ra->ra_avg_rssi)); 276 } 277 278 /* 279 * Adapt the data rate to suit the conditions. When a transmitted 280 * packet is dropped after IEEE80211_RSSADAPT_RETRY_LIMIT retransmissions, 281 * raise the RSS threshold for transmitting packets of similar length at 282 * the same data rate. 283 */ 284 void 285 ieee80211_rssadapt_lower_rate(struct ieee80211com *ic, 286 struct ieee80211_node *ni, struct ieee80211_rssadapt *ra, 287 struct ieee80211_rssdesc *id) 288 { 289 struct ieee80211_rateset *rs = &ni->ni_rates; 290 u_int16_t last_thr; 291 u_int i, thridx, top; 292 293 ra->ra_nfail++; 294 295 if (id->id_rateidx >= rs->rs_nrates) { 296 RSSADAPT_PRINTF(("ieee80211_rssadapt_lower_rate: " 297 "%s rate #%d > #%d out of bounds\n", 298 ether_sprintf(ni->ni_macaddr), id->id_rateidx, 299 rs->rs_nrates - 1)); 300 return; 301 } 302 303 for (i = 0, top = IEEE80211_RSSADAPT_BKT0; 304 i < IEEE80211_RSSADAPT_BKTS; 305 i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) { 306 thridx = i; 307 if (id->id_len <= top) 308 break; 309 } 310 311 last_thr = ra->ra_rate_thresh[thridx][id->id_rateidx]; 312 ra->ra_rate_thresh[thridx][id->id_rateidx] = 313 interpolate(master_expavgctl.rc_thresh, last_thr, 314 (id->id_rssi << 8)); 315 316 RSSADAPT_PRINTF(("%s: dst %s rssi %d threshold[%d, %d.%d] %d -> %d\n", 317 ic->ic_ifp->if_xname, ether_sprintf(ni->ni_macaddr), 318 id->id_rssi, id->id_len, 319 (rs->rs_rates[id->id_rateidx] & IEEE80211_RATE_VAL) / 2, 320 (rs->rs_rates[id->id_rateidx] & IEEE80211_RATE_VAL) * 5 % 10, 321 last_thr, ra->ra_rate_thresh[thridx][id->id_rateidx])); 322 } 323 324 void 325 ieee80211_rssadapt_raise_rate(struct ieee80211com *ic, 326 struct ieee80211_rssadapt *ra, struct ieee80211_rssdesc *id) 327 { 328 u_int16_t (*thrs)[IEEE80211_RATE_SIZE], newthr, oldthr; 329 struct ieee80211_node *ni = id->id_node; 330 struct ieee80211_rateset *rs = &ni->ni_rates; 331 int i, rate, top; 332 #ifdef IEEE80211_DEBUG 333 int j; 334 #endif 335 336 ra->ra_nok++; 337 338 if (!ratecheck(&ra->ra_last_raise, &ra->ra_raise_interval)) 339 return; 340 341 for (i = 0, top = IEEE80211_RSSADAPT_BKT0; 342 i < IEEE80211_RSSADAPT_BKTS; 343 i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) { 344 thrs = &ra->ra_rate_thresh[i]; 345 if (id->id_len <= top) 346 break; 347 } 348 349 if (id->id_rateidx + 1 < rs->rs_nrates && 350 (*thrs)[id->id_rateidx + 1] > (*thrs)[id->id_rateidx]) { 351 rate = (rs->rs_rates[id->id_rateidx + 1] & IEEE80211_RATE_VAL); 352 353 __USE(rate); 354 RSSADAPT_PRINTF(("%s: threshold[%d, %d.%d] decay %d ", 355 ic->ic_ifp->if_xname, 356 IEEE80211_RSSADAPT_BKT0 << (IEEE80211_RSSADAPT_BKTPOWER* i), 357 rate / 2, rate * 5 % 10, (*thrs)[id->id_rateidx + 1])); 358 oldthr = (*thrs)[id->id_rateidx + 1]; 359 if ((*thrs)[id->id_rateidx] == 0) 360 newthr = ra->ra_avg_rssi; 361 else 362 newthr = (*thrs)[id->id_rateidx]; 363 (*thrs)[id->id_rateidx + 1] = 364 interpolate(master_expavgctl.rc_decay, oldthr, newthr); 365 366 RSSADAPT_PRINTF(("-> %d\n", (*thrs)[id->id_rateidx + 1])); 367 } 368 369 #ifdef IEEE80211_DEBUG 370 if (RSSADAPT_DO_PRINT()) { 371 printf("%s: dst %s thresholds\n", ic->ic_ifp->if_xname, 372 ether_sprintf(ni->ni_macaddr)); 373 for (i = 0; i < IEEE80211_RSSADAPT_BKTS; i++) { 374 printf("%d-byte", IEEE80211_RSSADAPT_BKT0 << (IEEE80211_RSSADAPT_BKTPOWER * i)); 375 for (j = 0; j < rs->rs_nrates; j++) { 376 rate = (rs->rs_rates[j] & IEEE80211_RATE_VAL); 377 printf(", T[%d.%d] = %d", rate / 2, 378 rate * 5 % 10, ra->ra_rate_thresh[i][j]); 379 } 380 printf("\n"); 381 } 382 } 383 #endif /* IEEE80211_DEBUG */ 384 } 385
Indexes created Sun Sep 21 16:09:51 GMT 2025