if_rtwn_task.c

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    1 /*-
    2  * Copyright (c) 2015-2016 Andriy Voskoboinyk <avos@FreeBSD.org>
    3  *
    4  * Permission to use, copy, modify, and distribute this software for any
    5  * purpose with or without fee is hereby granted, provided that the above
    6  * copyright notice and this permission notice appear in all copies.
    7  *
    8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   15  */
   16 
   17 #include <sys/cdefs.h>
   18 __FBSDID("$FreeBSD$");
   19 
   20 #include "opt_wlan.h"
   21 
   22 #include <sys/param.h>
   23 #include <sys/lock.h>
   24 #include <sys/mutex.h>
   25 #include <sys/mbuf.h>
   26 #include <sys/kernel.h>
   27 #include <sys/socket.h>
   28 #include <sys/systm.h>
   29 #include <sys/malloc.h>
   30 #include <sys/queue.h>
   31 #include <sys/taskqueue.h>
   32 #include <sys/bus.h>
   33 #include <sys/endian.h>
   34 
   35 #include <net/if.h>
   36 #include <net/ethernet.h>
   37 #include <net/if_media.h>
   38 
   39 #include <net80211/ieee80211_var.h>
   40 #include <net80211/ieee80211_radiotap.h>
   41 
   42 #include <dev/rtwn/if_rtwnvar.h>
   43 
   44 #include <dev/rtwn/if_rtwn_task.h>
   45 
   46 static void
   47 rtwn_cmdq_cb(void *arg, int pending)
   48 {
   49         struct rtwn_softc *sc = arg;
   50         struct rtwn_cmdq *item;
   51 
   52         /*
   53          * Device must be powered on (via rtwn_power_on())
   54          * before any command may be sent.
   55          */
   56         RTWN_LOCK(sc);
   57         if (!(sc->sc_flags & RTWN_RUNNING)) {
   58                 RTWN_UNLOCK(sc);
   59                 return;
   60         }
   61 
   62         RTWN_CMDQ_LOCK(sc);
   63         while (sc->cmdq[sc->cmdq_first].func != NULL) {
   64                 item = &sc->cmdq[sc->cmdq_first];
   65                 sc->cmdq_first = (sc->cmdq_first + 1) % RTWN_CMDQ_SIZE;
   66                 RTWN_CMDQ_UNLOCK(sc);
   67 
   68                 item->func(sc, &item->data);
   69 
   70                 RTWN_CMDQ_LOCK(sc);
   71                 memset(item, 0, sizeof (*item));
   72         }
   73         RTWN_CMDQ_UNLOCK(sc);
   74         RTWN_UNLOCK(sc);
   75 }
   76 
   77 void
   78 rtwn_cmdq_init(struct rtwn_softc *sc)
   79 {
   80         RTWN_CMDQ_LOCK_INIT(sc);
   81         TASK_INIT(&sc->cmdq_task, 0, rtwn_cmdq_cb, sc);
   82 }
   83 
   84 void
   85 rtwn_cmdq_destroy(struct rtwn_softc *sc)
   86 {
   87         if (RTWN_CMDQ_LOCK_INITIALIZED(sc))
   88                 RTWN_CMDQ_LOCK_DESTROY(sc);
   89 }
   90 
   91 int
   92 rtwn_cmd_sleepable(struct rtwn_softc *sc, const void *ptr, size_t len,
   93     CMD_FUNC_PROTO)
   94 {
   95         struct ieee80211com *ic = &sc->sc_ic;
   96 
   97         KASSERT(len <= sizeof(union sec_param), ("buffer overflow"));
   98 
   99         RTWN_CMDQ_LOCK(sc);
  100         if (sc->sc_detached) {
  101                 RTWN_CMDQ_UNLOCK(sc);
  102                 return (ESHUTDOWN);
  103         }
  104 
  105         if (sc->cmdq[sc->cmdq_last].func != NULL) {
  106                 device_printf(sc->sc_dev, "%s: cmdq overflow\n", __func__);
  107                 RTWN_CMDQ_UNLOCK(sc);
  108 
  109                 return (EAGAIN);
  110         }
  111 
  112         if (ptr != NULL)
  113                 memcpy(&sc->cmdq[sc->cmdq_last].data, ptr, len);
  114         sc->cmdq[sc->cmdq_last].func = func;
  115         sc->cmdq_last = (sc->cmdq_last + 1) % RTWN_CMDQ_SIZE;
  116         RTWN_CMDQ_UNLOCK(sc);
  117 
  118         ieee80211_runtask(ic, &sc->cmdq_task);
  119 
  120         return (0);
  121 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/rtwn/if_rtwn_task.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/rtwn/if_rtwn_task.c