diff options
Diffstat (limited to 'sys/dev/ral/if_ralrate.c')
| -rw-r--r-- | sys/dev/ral/if_ralrate.c | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/sys/dev/ral/if_ralrate.c b/sys/dev/ral/if_ralrate.c deleted file mode 100644 index b8922ba..0000000 --- a/sys/dev/ral/if_ralrate.c +++ /dev/null @@ -1,192 +0,0 @@ -/* $FreeBSD$ */ -/* $NetBSD: ieee80211_rssadapt.c,v 1.9 2005/02/26 22:45:09 perry Exp $ */ -/*- - * Copyright (c) 2003, 2004 David Young. All rights reserved. - * - * Redistribution and use in source and binary forms, with or - * without modification, are permitted provided that the following - * conditions are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following - * disclaimer in the documentation and/or other materials provided - * with the distribution. - * 3. The name of David Young may not be used to endorse or promote - * products derived from this software without specific prior - * written permission. - * - * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, - * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A - * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL David - * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED - * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND - * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, - * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY - * OF SUCH DAMAGE. - */ - -#include <sys/param.h> -#include <sys/sockio.h> -#include <sys/mbuf.h> -#include <sys/kernel.h> -#include <sys/socket.h> - -#include <net/if.h> -#include <net/if_arp.h> -#include <net/ethernet.h> -#include <net/if_dl.h> -#include <net/if_media.h> -#include <net/if_types.h> - -#include <net80211/ieee80211_var.h> - -#include <dev/ral/if_ralrate.h> - -#ifdef interpolate -#undef interpolate -#endif -#define interpolate(parm, old, new) ((parm##_old * (old) + \ - (parm##_denom - parm##_old) * (new)) / \ - parm##_denom) - -static struct ral_rssadapt_expavgctl master_expavgctl = { - rc_decay_denom : 16, - rc_decay_old : 15, - rc_thresh_denom : 8, - rc_thresh_old : 4, - rc_avgrssi_denom : 8, - rc_avgrssi_old : 4 -}; - -int -ral_rssadapt_choose(struct ral_rssadapt *ra, struct ieee80211_rateset *rs, - struct ieee80211_frame *wh, u_int len, const char *dvname, int do_not_adapt) -{ - u_int16_t (*thrs)[IEEE80211_RATE_SIZE]; - int flags = 0, i, rateidx = 0, thridx, top; - - if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) - flags |= IEEE80211_RATE_BASIC; - - for (i = 0, top = RAL_RSSADAPT_BKT0; - i < RAL_RSSADAPT_BKTS; - i++, top <<= RAL_RSSADAPT_BKTPOWER) { - thridx = i; - if (len <= top) - break; - } - - thrs = &ra->ra_rate_thresh[thridx]; - - i = rs->rs_nrates; - while (--i >= 0) { - rateidx = i; - if ((rs->rs_rates[i] & flags) != flags) - continue; - if (do_not_adapt) - break; - if ((*thrs)[i] < ra->ra_avg_rssi) - break; - } - - return rateidx; -} - -void -ral_rssadapt_updatestats(struct ral_rssadapt *ra) -{ - long interval; - - ra->ra_pktrate = - (ra->ra_pktrate + 10 * (ra->ra_nfail + ra->ra_nok)) / 2; - ra->ra_nfail = ra->ra_nok = 0; - - /* a node is eligible for its rate to be raised every 1/10 to 10 - * seconds, more eligible in proportion to recent packet rates. - */ - interval = MAX(100000, 10000000 / MAX(1, 10 * ra->ra_pktrate)); - ra->ra_raise_interval.tv_sec = interval / (1000 * 1000); - ra->ra_raise_interval.tv_usec = interval % (1000 * 1000); -} - -void -ral_rssadapt_input(struct ieee80211com *ic, struct ieee80211_node *ni, - struct ral_rssadapt *ra, int rssi) -{ - ra->ra_avg_rssi = interpolate(master_expavgctl.rc_avgrssi, - ra->ra_avg_rssi, (rssi << 8)); -} - -/* - * Adapt the data rate to suit the conditions. When a transmitted - * packet is dropped after RAL_RSSADAPT_RETRY_LIMIT retransmissions, - * raise the RSS threshold for transmitting packets of similar length at - * the same data rate. - */ -void -ral_rssadapt_lower_rate(struct ieee80211com *ic, struct ieee80211_node *ni, - struct ral_rssadapt *ra, struct ral_rssdesc *id) -{ - struct ieee80211_rateset *rs = &ni->ni_rates; - u_int16_t last_thr; - u_int i, thridx, top; - - ra->ra_nfail++; - - if (id->id_rateidx >= rs->rs_nrates) - return; - - for (i = 0, top = RAL_RSSADAPT_BKT0; - i < RAL_RSSADAPT_BKTS; - i++, top <<= RAL_RSSADAPT_BKTPOWER) { - thridx = i; - if (id->id_len <= top) - break; - } - - last_thr = ra->ra_rate_thresh[thridx][id->id_rateidx]; - ra->ra_rate_thresh[thridx][id->id_rateidx] = - interpolate(master_expavgctl.rc_thresh, last_thr, - (id->id_rssi << 8)); -} - -void -ral_rssadapt_raise_rate(struct ieee80211com *ic, struct ral_rssadapt *ra, - struct ral_rssdesc *id) -{ - u_int16_t (*thrs)[IEEE80211_RATE_SIZE], newthr, oldthr; - struct ieee80211_node *ni = id->id_node; - struct ieee80211_rateset *rs = &ni->ni_rates; - int i, rate, top; - - ra->ra_nok++; - - if (!ratecheck(&ra->ra_last_raise, &ra->ra_raise_interval)) - return; - - for (i = 0, top = RAL_RSSADAPT_BKT0; - i < RAL_RSSADAPT_BKTS; - i++, top <<= RAL_RSSADAPT_BKTPOWER) { - thrs = &ra->ra_rate_thresh[i]; - if (id->id_len <= top) - break; - } - - if (id->id_rateidx + 1 < rs->rs_nrates && - (*thrs)[id->id_rateidx + 1] > (*thrs)[id->id_rateidx]) { - rate = (rs->rs_rates[id->id_rateidx + 1] & IEEE80211_RATE_VAL); - - oldthr = (*thrs)[id->id_rateidx + 1]; - if ((*thrs)[id->id_rateidx] == 0) - newthr = ra->ra_avg_rssi; - else - newthr = (*thrs)[id->id_rateidx]; - (*thrs)[id->id_rateidx + 1] = - interpolate(master_expavgctl.rc_decay, oldthr, newthr); - } -} |
