The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/ath/if_ath_alq.c

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    1 /*-
    2  * Copyright (c) 2012 Adrian Chadd
    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  *    without modification.
   11  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
   12  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
   13  *    redistribution must be conditioned upon including a substantially
   14  *    similar Disclaimer requirement for further binary redistribution.
   15  *
   16  * NO WARRANTY
   17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   19  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
   20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
   21  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
   22  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
   25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   27  * THE POSSIBILITY OF SUCH DAMAGES.
   28  *
   29  * $FreeBSD: releng/11.2/sys/dev/ath/if_ath_alq.c 331722 2018-03-29 02:50:57Z eadler $
   30  */
   31 #include "opt_ah.h"
   32 #include "opt_ath.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/sysctl.h>
   39 #include <sys/bus.h>
   40 #include <sys/malloc.h>
   41 #include <sys/proc.h>
   42 #include <sys/pcpu.h>
   43 #include <sys/lock.h>
   44 #include <sys/mutex.h>
   45 #include <sys/alq.h>
   46 #include <sys/endian.h>
   47 #include <sys/time.h>
   48 
   49 #include <dev/ath/if_ath_alq.h>
   50 
   51 #ifdef  ATH_DEBUG_ALQ
   52 static struct ale *
   53 if_ath_alq_get(struct if_ath_alq *alq, int len)
   54 {
   55         struct ale *ale;
   56 
   57         if (alq->sc_alq_isactive == 0)
   58                 return (NULL);
   59 
   60         ale = alq_getn(alq->sc_alq_alq, len, ALQ_NOWAIT);
   61         if (! ale)
   62                 alq->sc_alq_numlost++;
   63         return (ale);
   64 }
   65 
   66 void
   67 if_ath_alq_init(struct if_ath_alq *alq, const char *devname)
   68 {
   69 
   70         bzero(alq, sizeof(*alq));
   71 
   72         strncpy(alq->sc_alq_devname, devname, ATH_ALQ_DEVNAME_LEN);
   73         printf("%s (%s): attached\n", __func__, alq->sc_alq_devname);
   74         snprintf(alq->sc_alq_filename, ATH_ALQ_FILENAME_LEN,
   75             "/tmp/ath_%s_alq.log", alq->sc_alq_devname);
   76 
   77         /* XXX too conservative, right? */
   78         alq->sc_alq_qsize = (64*1024);
   79 }
   80 
   81 void
   82 if_ath_alq_setcfg(struct if_ath_alq *alq, uint32_t macVer,
   83     uint32_t macRev, uint32_t phyRev, uint32_t halMagic)
   84 {
   85 
   86         /* Store these in network order */
   87         alq->sc_alq_cfg.sc_mac_version = htobe32(macVer);
   88         alq->sc_alq_cfg.sc_mac_revision = htobe32(macRev);
   89         alq->sc_alq_cfg.sc_phy_rev = htobe32(phyRev);
   90         alq->sc_alq_cfg.sc_hal_magic = htobe32(halMagic);
   91 }
   92 
   93 void
   94 if_ath_alq_tidyup(struct if_ath_alq *alq)
   95 {
   96 
   97         if_ath_alq_stop(alq);
   98         printf("%s (%s): detached\n", __func__, alq->sc_alq_devname);
   99         bzero(alq, sizeof(*alq));
  100 }
  101 
  102 int
  103 if_ath_alq_start(struct if_ath_alq *alq)
  104 {
  105         int error;
  106 
  107         if (alq->sc_alq_isactive)
  108                 return (0);
  109 
  110         /*
  111          * Create a variable-length ALQ.
  112          */
  113         error = alq_open(&alq->sc_alq_alq, alq->sc_alq_filename,
  114             curthread->td_ucred, ALQ_DEFAULT_CMODE,
  115             alq->sc_alq_qsize, 0);
  116 
  117         if (error != 0) {
  118                 printf("%s (%s): failed, err=%d\n", __func__,
  119                     alq->sc_alq_devname, error);
  120         } else {
  121                 printf("%s (%s): opened\n", __func__, alq->sc_alq_devname);
  122                 alq->sc_alq_isactive = 1;
  123                 if_ath_alq_post(alq, ATH_ALQ_INIT_STATE,
  124                     sizeof (struct if_ath_alq_init_state),
  125                     (char *) &alq->sc_alq_cfg);
  126         }
  127         return (error);
  128 }
  129 
  130 int
  131 if_ath_alq_stop(struct if_ath_alq *alq)
  132 {
  133 
  134         if (alq->sc_alq_isactive == 0)
  135                 return (0);
  136 
  137         printf("%s (%s): closed\n", __func__, alq->sc_alq_devname);
  138 
  139         alq->sc_alq_isactive = 0;
  140         alq_close(alq->sc_alq_alq);
  141         alq->sc_alq_alq = NULL;
  142 
  143         return (0);
  144 }
  145 
  146 /*
  147  * Post a debug message to the ALQ.
  148  *
  149  * "len" is the size of the buf payload in bytes.
  150  */
  151 void
  152 if_ath_alq_post(struct if_ath_alq *alq, uint16_t op, uint16_t len,
  153     const char *buf)
  154 {
  155         struct if_ath_alq_hdr *ap;
  156         struct ale *ale;
  157         struct timeval tv;
  158 
  159         if (! if_ath_alq_checkdebug(alq, op))
  160                 return;
  161 
  162         microtime(&tv);
  163 
  164         /*
  165          * Enforce some semblence of sanity on 'len'.
  166          * Although strictly speaking, any length is possible -
  167          * just be conservative so things don't get out of hand.
  168          */
  169         if (len > ATH_ALQ_PAYLOAD_LEN)
  170                 len = ATH_ALQ_PAYLOAD_LEN;
  171 
  172         ale = if_ath_alq_get(alq, len + sizeof(struct if_ath_alq_hdr));
  173 
  174         if (ale == NULL)
  175                 return;
  176 
  177         ap = (struct if_ath_alq_hdr *) ale->ae_data;
  178         ap->threadid = htobe64((uint64_t) curthread->td_tid);
  179         ap->tstamp_sec = htobe32((uint32_t) tv.tv_sec);
  180         ap->tstamp_usec = htobe32((uint32_t) tv.tv_usec);
  181         ap->op = htobe16(op);
  182         ap->len = htobe16(len);
  183 
  184         /*
  185          * Copy the payload _after_ the header field.
  186          */
  187         if (buf != NULL) {
  188                 memcpy(((char *) ap) + sizeof(struct if_ath_alq_hdr),
  189                     buf,
  190                     len);
  191         }
  192 
  193         alq_post(alq->sc_alq_alq, ale);
  194 }
  195 #endif  /* ATH_DEBUG */

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