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 #include "opt_wlan.h"
19
20 #include <sys/param.h>
21 #include <sys/lock.h>
22 #include <sys/mutex.h>
23 #include <sys/mbuf.h>
24 #include <sys/kernel.h>
25 #include <sys/socket.h>
26 #include <sys/systm.h>
27 #include <sys/malloc.h>
28 #include <sys/queue.h>
29 #include <sys/taskqueue.h>
30 #include <sys/bus.h>
31 #include <sys/endian.h>
32
33 #include <net/if.h>
34 #include <net/ethernet.h>
35 #include <net/if_media.h>
36
37 #include <net80211/ieee80211_var.h>
38 #include <net80211/ieee80211_radiotap.h>
39
40 #include <dev/rtwn/if_rtwnvar.h>
41
42 #include <dev/rtwn/if_rtwn_task.h>
43
44 static void
rtwn_cmdq_cb(void * arg,int pending)45 rtwn_cmdq_cb(void *arg, int pending)
46 {
47 struct rtwn_softc *sc = arg;
48 struct rtwn_cmdq *item;
49
50 /*
51 * Device must be powered on (via rtwn_power_on())
52 * before any command may be sent.
53 */
54 RTWN_LOCK(sc);
55 if (!(sc->sc_flags & RTWN_RUNNING)) {
56 RTWN_UNLOCK(sc);
57 return;
58 }
59
60 RTWN_CMDQ_LOCK(sc);
61 while (sc->cmdq[sc->cmdq_first].func != NULL) {
62 item = &sc->cmdq[sc->cmdq_first];
63 sc->cmdq_first = (sc->cmdq_first + 1) % RTWN_CMDQ_SIZE;
64 RTWN_CMDQ_UNLOCK(sc);
65
66 item->func(sc, &item->data);
67
68 RTWN_CMDQ_LOCK(sc);
69 memset(item, 0, sizeof (*item));
70 }
71 RTWN_CMDQ_UNLOCK(sc);
72 RTWN_UNLOCK(sc);
73 }
74
75 void
rtwn_cmdq_init(struct rtwn_softc * sc)76 rtwn_cmdq_init(struct rtwn_softc *sc)
77 {
78 RTWN_CMDQ_LOCK_INIT(sc);
79 TASK_INIT(&sc->cmdq_task, 0, rtwn_cmdq_cb, sc);
80 }
81
82 void
rtwn_cmdq_destroy(struct rtwn_softc * sc)83 rtwn_cmdq_destroy(struct rtwn_softc *sc)
84 {
85 if (RTWN_CMDQ_LOCK_INITIALIZED(sc))
86 RTWN_CMDQ_LOCK_DESTROY(sc);
87 }
88
89 int
rtwn_cmd_sleepable(struct rtwn_softc * sc,const void * ptr,size_t len,CMD_FUNC_PROTO)90 rtwn_cmd_sleepable(struct rtwn_softc *sc, const void *ptr, size_t len,
91 CMD_FUNC_PROTO)
92 {
93 struct ieee80211com *ic = &sc->sc_ic;
94
95 KASSERT(len <= sizeof(union sec_param), ("buffer overflow"));
96
97 RTWN_CMDQ_LOCK(sc);
98 if (sc->sc_detached) {
99 RTWN_CMDQ_UNLOCK(sc);
100 return (ESHUTDOWN);
101 }
102
103 if (sc->cmdq[sc->cmdq_last].func != NULL) {
104 device_printf(sc->sc_dev, "%s: cmdq overflow\n", __func__);
105 RTWN_CMDQ_UNLOCK(sc);
106
107 return (EAGAIN);
108 }
109
110 if (ptr != NULL)
111 memcpy(&sc->cmdq[sc->cmdq_last].data, ptr, len);
112 sc->cmdq[sc->cmdq_last].func = func;
113 sc->cmdq_last = (sc->cmdq_last + 1) % RTWN_CMDQ_SIZE;
114 RTWN_CMDQ_UNLOCK(sc);
115
116 ieee80211_runtask(ic, &sc->cmdq_task);
117
118 return (0);
119 }
120