sys/net80211/ieee80211_ratectl.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2010 Rui Paulo <rpaulo@FreeBSD.org>
   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 ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/param.h>
  29 #include <sys/kernel.h>
  30 #include <sys/sbuf.h>
  31 #include <sys/systm.h>
  32 #include <sys/socket.h>
  33 #include <sys/malloc.h>
  34
  35 #include <net/if.h>
  36 #include <net/if_media.h>
  37 #include <net/ethernet.h>
  38 #include <net/route.h>
  39
  40 #include <net80211/ieee80211_var.h>
  41 #include <net80211/ieee80211_ratectl.h>
  42
  43 static const struct ieee80211_ratectl *ratectls[IEEE80211_RATECTL_MAX];
  44
  45 static const char *ratectl_modnames[IEEE80211_RATECTL_MAX] = {
  46         [IEEE80211_RATECTL_AMRR]        = "wlan_amrr",
  47         [IEEE80211_RATECTL_RSSADAPT]    = "wlan_rssadapt",
  48         [IEEE80211_RATECTL_ONOE]        = "wlan_onoe",
  49         [IEEE80211_RATECTL_SAMPLE]      = "wlan_sample",
  50         [IEEE80211_RATECTL_NONE]        = "wlan_none",
  51 };
  52
  53 MALLOC_DEFINE(M_80211_RATECTL, "80211ratectl", "802.11 rate control");
  54
  55 void
  56 ieee80211_ratectl_register(int type, const struct ieee80211_ratectl *ratectl)
  57 {
  58         if (type >= IEEE80211_RATECTL_MAX)
  59                 return;
  60         ratectls[type] = ratectl;
  61 }
  62
  63 void
  64 ieee80211_ratectl_unregister(int type)
  65 {
  66         if (type >= IEEE80211_RATECTL_MAX)
  67                 return;
  68         ratectls[type] = NULL;
  69 }
  70
  71 static void
  72 ieee80211_ratectl_sysctl_stats_node_iter(void *arg, struct ieee80211_node *ni)
  73 {
  74
  75         struct sbuf *sb = (struct sbuf *) arg;
  76         sbuf_printf(sb, "MAC: %6D\n", ni->ni_macaddr, ":");
  77         ieee80211_ratectl_node_stats(ni, sb);
  78         sbuf_printf(sb, "\n");
  79 }
  80
  81 static int
  82 ieee80211_ratectl_sysctl_stats(SYSCTL_HANDLER_ARGS)
  83 {
  84         struct ieee80211vap *vap = arg1;
  85         struct ieee80211com *ic = vap->iv_ic;
  86         struct sbuf sb;
  87         int error;
  88
  89         error = sysctl_wire_old_buffer(req, 0);
  90         if (error)
  91                 return (error);
  92         sbuf_new_for_sysctl(&sb, NULL, 8, req);
  93         sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
  94
  95         IEEE80211_LOCK(ic);
  96         ieee80211_iterate_nodes(&ic->ic_sta,
  97             ieee80211_ratectl_sysctl_stats_node_iter,
  98             &sb);
  99         IEEE80211_UNLOCK(ic);
 100
 101         error = sbuf_finish(&sb);
 102         sbuf_delete(&sb);
 103         return (error);
 104 }
 105
 106 void
 107 ieee80211_ratectl_init(struct ieee80211vap *vap)
 108 {
 109         if (vap->iv_rate == ratectls[IEEE80211_RATECTL_NONE])
 110                 ieee80211_ratectl_set(vap, IEEE80211_RATECTL_AMRR);
 111         vap->iv_rate->ir_init(vap);
 112
 113         /* Attach generic stats sysctl */
 114         SYSCTL_ADD_PROC(vap->iv_sysctl, SYSCTL_CHILDREN(vap->iv_oid), OID_AUTO,
 115             "rate_stats", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, vap,
 116             0, ieee80211_ratectl_sysctl_stats, "A", "ratectl node stats");
 117 }
 118
 119 void
 120 ieee80211_ratectl_set(struct ieee80211vap *vap, int type)
 121 {
 122         if (type >= IEEE80211_RATECTL_MAX)
 123                 return;
 124         if (ratectls[type] == NULL) {
 125                 ieee80211_load_module(ratectl_modnames[type]);
 126                 if (ratectls[type] == NULL) {
 127                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_RATECTL,
 128                             "%s: unable to load algo %u, module %s\n",
 129                             __func__, type, ratectl_modnames[type]);
 130                         vap->iv_rate = ratectls[IEEE80211_RATECTL_NONE];
 131                         return;
 132                 }
 133         }
 134         vap->iv_rate = ratectls[type];
 135 }