sys/netproto/802_11/wlan/ieee80211_ratectl.c

   1 /*-
   2  * Copyright (c) 2010 Rui Paulo <rpaulo@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * 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 copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 __FBSDID("$FreeBSD$");
  28
  29 #include <sys/param.h>
  30 #include <sys/kernel.h>
  31 #include <sys/sbuf.h>
  32 #include <sys/systm.h>
  33 #include <sys/socket.h>
  34 #include <sys/malloc.h>
  35
  36 #include <net/if.h>
  37 #include <net/if_var.h>
  38 #include <net/if_media.h>
  39 #include <net/ethernet.h>
  40 #include <net/route.h>
  41
  42 #include <netproto/802_11/ieee80211_var.h>
  43 #include <netproto/802_11/ieee80211_ratectl.h>
  44
  45 static const struct ieee80211_ratectl *ratectls[IEEE80211_RATECTL_MAX];
  46
  47 static const char *ratectl_modnames[IEEE80211_RATECTL_MAX] = {
  48         [IEEE80211_RATECTL_AMRR]        = "wlan_amrr",
  49         [IEEE80211_RATECTL_RSSADAPT]    = "wlan_rssadapt",
  50         [IEEE80211_RATECTL_ONOE]        = "wlan_onoe",
  51         [IEEE80211_RATECTL_SAMPLE]      = "wlan_sample",
  52         [IEEE80211_RATECTL_NONE]        = "wlan_none",
  53 };
  54
  55 MALLOC_DEFINE(M_80211_RATECTL, "80211ratectl", "802.11 rate control");
  56
  57 void
  58 ieee80211_ratectl_register(int type, const struct ieee80211_ratectl *ratectl)
  59 {
  60         if (type >= IEEE80211_RATECTL_MAX)
  61                 return;
  62         ratectls[type] = ratectl;
  63 }
  64
  65 void
  66 ieee80211_ratectl_unregister(int type)
  67 {
  68         if (type >= IEEE80211_RATECTL_MAX)
  69                 return;
  70         ratectls[type] = NULL;
  71 }
  72
  73 static void
  74 ieee80211_ratectl_sysctl_stats_node_iter(void *arg, struct ieee80211_node *ni)
  75 {
  76
  77         struct sbuf *sb = (struct sbuf *) arg;
  78 #if defined(__DragonFly__)
  79         sbuf_printf(sb, "MAC: %6s\n", ether_sprintf(ni->ni_macaddr));
  80 #else
  81         sbuf_printf(sb, "MAC: %6D\n", ni->ni_macaddr, ":");
  82 #endif
  83         ieee80211_ratectl_node_stats(ni, sb);
  84         sbuf_printf(sb, "\n");
  85 }
  86
  87 static int
  88 ieee80211_ratectl_sysctl_stats(SYSCTL_HANDLER_ARGS)
  89 {
  90         struct ieee80211vap *vap = arg1;
  91         struct ieee80211com *ic = vap->iv_ic;
  92         struct sbuf sb;
  93         int error;
  94
  95 #if defined(__DragonFly__)
  96 #else
  97         error = sysctl_wire_old_buffer(req, 0);
  98         if (error)
  99                 return (error);
 100 #endif
 101         sbuf_new_for_sysctl(&sb, NULL, 8, req);
 102 #if defined(__DragonFly__)
 103 #else
 104         sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
 105 #endif
 106
 107         IEEE80211_LOCK(ic);
 108         ieee80211_iterate_nodes(&ic->ic_sta,
 109             ieee80211_ratectl_sysctl_stats_node_iter,
 110             &sb);
 111         IEEE80211_UNLOCK(ic);
 112
 113         error = sbuf_finish(&sb);
 114         sbuf_delete(&sb);
 115         return (error);
 116 }
 117
 118 void
 119 ieee80211_ratectl_init(struct ieee80211vap *vap)
 120 {
 121         if (vap->iv_rate == ratectls[IEEE80211_RATECTL_NONE])
 122                 ieee80211_ratectl_set(vap, IEEE80211_RATECTL_AMRR);
 123         vap->iv_rate->ir_init(vap);
 124
 125         /* Attach generic stats sysctl */
 126 #if defined(__DragonFly__)
 127         SYSCTL_ADD_PROC(vap->iv_sysctl, SYSCTL_CHILDREN(vap->iv_oid), OID_AUTO,
 128             "rate_stats", CTLTYPE_STRING | CTLFLAG_RD, vap,
 129             0, ieee80211_ratectl_sysctl_stats, "A", "ratectl node stats");
 130 #else
 131         SYSCTL_ADD_PROC(vap->iv_sysctl, SYSCTL_CHILDREN(vap->iv_oid), OID_AUTO,
 132             "rate_stats", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, vap,
 133             0, ieee80211_ratectl_sysctl_stats, "A", "ratectl node stats");
 134 #endif
 135 }
 136
 137 void
 138 ieee80211_ratectl_set(struct ieee80211vap *vap, int type)
 139 {
 140         if (type >= IEEE80211_RATECTL_MAX)
 141                 return;
 142         if (ratectls[type] == NULL) {
 143                 ieee80211_load_module(ratectl_modnames[type]);
 144                 if (ratectls[type] == NULL) {
 145                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_RATECTL,
 146                             "%s: unable to load algo %u, module %s\n",
 147                             __func__, type, ratectl_modnames[type]);
 148                         vap->iv_rate = ratectls[IEEE80211_RATECTL_NONE];
 149                         return;
 150                 }
 151         }
 152         vap->iv_rate = ratectls[type];
 153 }