FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_ratectl.c

     /*-
      * Copyright (c) 2010 Rui Paulo <rpaulo@FreeBSD.org>
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.0/sys/net80211/ieee80211_ratectl.c 296925 2016-03-16 02:07:04Z adrian $");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/sbuf.h>
    #include <sys/systm.h>
    #include <sys/socket.h>
    #include <sys/malloc.h>
    
    #include <net/if.h>
    #include <net/if_media.h>
    #include <net/ethernet.h>
    #include <net/route.h>
    
    #include <net80211/ieee80211_var.h>
    #include <net80211/ieee80211_ratectl.h>
    
    static const struct ieee80211_ratectl *ratectls[IEEE80211_RATECTL_MAX];
    
    static const char *ratectl_modnames[IEEE80211_RATECTL_MAX] = {
            [IEEE80211_RATECTL_AMRR]        = "wlan_amrr",
            [IEEE80211_RATECTL_RSSADAPT]    = "wlan_rssadapt",
            [IEEE80211_RATECTL_ONOE]        = "wlan_onoe",
            [IEEE80211_RATECTL_SAMPLE]      = "wlan_sample",
            [IEEE80211_RATECTL_NONE]        = "wlan_none",
    };
    
    MALLOC_DEFINE(M_80211_RATECTL, "80211ratectl", "802.11 rate control");
    
    void
    ieee80211_ratectl_register(int type, const struct ieee80211_ratectl *ratectl)
    {
            if (type >= IEEE80211_RATECTL_MAX)
                    return;
            ratectls[type] = ratectl;
    }
    
    void
    ieee80211_ratectl_unregister(int type)
    {
            if (type >= IEEE80211_RATECTL_MAX)
                    return;
            ratectls[type] = NULL;
    }
    
    static void
    ieee80211_ratectl_sysctl_stats_node_iter(void *arg, struct ieee80211_node *ni)
    {
    
            struct sbuf *sb = (struct sbuf *) arg;
            sbuf_printf(sb, "MAC: %6D\n", ni->ni_macaddr, ":");
            ieee80211_ratectl_node_stats(ni, sb);
            sbuf_printf(sb, "\n");
    }
    
    static int
    ieee80211_ratectl_sysctl_stats(SYSCTL_HANDLER_ARGS)
    {
            struct ieee80211vap *vap = arg1;
            struct ieee80211com *ic = vap->iv_ic;
            struct sbuf sb;
            int error;
    
            error = sysctl_wire_old_buffer(req, 0);
            if (error)
                    return (error);
            sbuf_new_for_sysctl(&sb, NULL, 8, req);
            sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
    
            IEEE80211_LOCK(ic);
            ieee80211_iterate_nodes(&ic->ic_sta,
                ieee80211_ratectl_sysctl_stats_node_iter,
                &sb);
           IEEE80211_UNLOCK(ic);
   
           error = sbuf_finish(&sb);
           sbuf_delete(&sb);
           return (error);
   }
   
   void
   ieee80211_ratectl_init(struct ieee80211vap *vap)
   {
           if (vap->iv_rate == ratectls[IEEE80211_RATECTL_NONE])
                   ieee80211_ratectl_set(vap, IEEE80211_RATECTL_AMRR);
           vap->iv_rate->ir_init(vap);
   
           /* Attach generic stats sysctl */
           SYSCTL_ADD_PROC(vap->iv_sysctl, SYSCTL_CHILDREN(vap->iv_oid), OID_AUTO,
               "rate_stats", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, vap,
               0, ieee80211_ratectl_sysctl_stats, "A", "ratectl node stats");
   }
   
   void
   ieee80211_ratectl_set(struct ieee80211vap *vap, int type)
   {
           if (type >= IEEE80211_RATECTL_MAX)
                   return;
           if (ratectls[type] == NULL) {
                   ieee80211_load_module(ratectl_modnames[type]);
                   if (ratectls[type] == NULL) {
                           IEEE80211_DPRINTF(vap, IEEE80211_MSG_RATECTL,
                               "%s: unable to load algo %u, module %s\n",
                               __func__, type, ratectl_modnames[type]);
                           vap->iv_rate = ratectls[IEEE80211_RATECTL_NONE];
                           return;
                   }
           }
           vap->iv_rate = ratectls[type];
   }

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