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 47 static void 48 rtwn_cmdq_cb(void *arg, int pending) 49 { 50 struct rtwn_softc *sc = arg; 51 struct rtwn_cmdq *item; 52 53 /* 54 * Device must be powered on (via rtwn_power_on()) 55 * before any command may be sent. 56 */ 57 RTWN_LOCK(sc); 58 if (!(sc->sc_flags & RTWN_RUNNING)) { 59 RTWN_UNLOCK(sc); 60 return; 61 } 62 63 RTWN_CMDQ_LOCK(sc); 64 while (sc->cmdq[sc->cmdq_first].func != NULL) { 65 item = &sc->cmdq[sc->cmdq_first]; 66 sc->cmdq_first = (sc->cmdq_first + 1) % RTWN_CMDQ_SIZE; 67 RTWN_CMDQ_UNLOCK(sc); 68 69 item->func(sc, &item->data); 70 71 RTWN_CMDQ_LOCK(sc); 72 memset(item, 0, sizeof (*item)); 73 } 74 RTWN_CMDQ_UNLOCK(sc); 75 RTWN_UNLOCK(sc); 76 } 77 78 void 79 rtwn_cmdq_init(struct rtwn_softc *sc) 80 { 81 RTWN_CMDQ_LOCK_INIT(sc); 82 TASK_INIT(&sc->cmdq_task, 0, rtwn_cmdq_cb, sc); 83 } 84 85 void 86 rtwn_cmdq_destroy(struct rtwn_softc *sc) 87 { 88 if (RTWN_CMDQ_LOCK_INITIALIZED(sc)) 89 RTWN_CMDQ_LOCK_DESTROY(sc); 90 } 91 92 int 93 rtwn_cmd_sleepable(struct rtwn_softc *sc, const void *ptr, size_t len, 94 CMD_FUNC_PROTO) 95 { 96 struct ieee80211com *ic = &sc->sc_ic; 97 98 KASSERT(len <= sizeof(union sec_param), ("buffer overflow")); 99 100 RTWN_CMDQ_LOCK(sc); 101 if (sc->sc_detached) { 102 RTWN_CMDQ_UNLOCK(sc); 103 return (ESHUTDOWN); 104 } 105 106 if (sc->cmdq[sc->cmdq_last].func != NULL) { 107 device_printf(sc->sc_dev, "%s: cmdq overflow\n", __func__); 108 RTWN_CMDQ_UNLOCK(sc); 109 110 return (EAGAIN); 111 } 112 113 if (ptr != NULL) 114 memcpy(&sc->cmdq[sc->cmdq_last].data, ptr, len); 115 sc->cmdq[sc->cmdq_last].func = func; 116 sc->cmdq_last = (sc->cmdq_last + 1) % RTWN_CMDQ_SIZE; 117 RTWN_CMDQ_UNLOCK(sc); 118 119 ieee80211_runtask(ic, &sc->cmdq_task); 120 121 return (0); 122 } 123