xref: /freebsd/sys/dev/rtwn/if_rtwn_tx.c (revision 792bbaba989533a1fc93823df1720c8c4aaf0442) 
1 /*	$OpenBSD: if_urtwn.c,v 1.16 2011/02/10 17:26:40 jakemsr Exp $	*/
2 
3 /*-
4  * Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr>
5  * Copyright (c) 2014 Kevin Lo <kevlo@FreeBSD.org>
6  * Copyright (c) 2015-2016 Andriy Voskoboinyk <avos@FreeBSD.org>
7  *
8  * Permission to use, copy, modify, and distribute this software for any
9  * purpose with or without fee is hereby granted, provided that the above
10  * copyright notice and this permission notice appear in all copies.
11  *
12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19  */
20 
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD$");
23 
24 #include "opt_wlan.h"
25 
26 #include <sys/param.h>
27 #include <sys/lock.h>
28 #include <sys/mutex.h>
29 #include <sys/mbuf.h>
30 #include <sys/kernel.h>
31 #include <sys/socket.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/queue.h>
35 #include <sys/taskqueue.h>
36 #include <sys/bus.h>
37 #include <sys/endian.h>
38 
39 #include <net/if.h>
40 #include <net/if_var.h>
41 #include <net/ethernet.h>
42 #include <net/if_media.h>
43 
44 #include <net80211/ieee80211_var.h>
45 #include <net80211/ieee80211_radiotap.h>
46 #include <net80211/ieee80211_ratectl.h>
47 #ifdef	IEEE80211_SUPPORT_SUPERG
48 #include <net80211/ieee80211_superg.h>
49 #endif
50 
51 #include <dev/rtwn/if_rtwnreg.h>
52 #include <dev/rtwn/if_rtwnvar.h>
53 
54 #include <dev/rtwn/if_rtwn_beacon.h>
55 #include <dev/rtwn/if_rtwn_debug.h>
56 #include <dev/rtwn/if_rtwn_ridx.h>
57 #include <dev/rtwn/if_rtwn_tx.h>
58 
59 
60 void
61 rtwn_drain_mbufq(struct rtwn_softc *sc)
62 {
63 	struct mbuf *m;
64 	struct ieee80211_node *ni;
65 	RTWN_ASSERT_LOCKED(sc);
66 	while ((m = mbufq_dequeue(&sc->sc_snd)) != NULL) {
67 		ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
68 		m->m_pkthdr.rcvif = NULL;
69 		ieee80211_free_node(ni);
70 		m_freem(m);
71 	}
72 }
73 
74 #ifdef IEEE80211_SUPPORT_SUPERG
75 void
76 rtwn_ff_flush_all(struct rtwn_softc *sc, union sec_param *data)
77 {
78 	struct ieee80211com *ic = &sc->sc_ic;
79 
80 	RTWN_UNLOCK(sc);
81 	ieee80211_ff_flush_all(ic);
82 	RTWN_LOCK(sc);
83 }
84 #endif
85 
86 static uint8_t
87 rtwn_get_cipher(u_int ic_cipher)
88 {
89 	uint8_t cipher;
90 
91 	switch (ic_cipher) {
92 	case IEEE80211_CIPHER_NONE:
93 		cipher = RTWN_TXDW1_CIPHER_NONE;
94 		break;
95 	case IEEE80211_CIPHER_WEP:
96 	case IEEE80211_CIPHER_TKIP:
97 		cipher = RTWN_TXDW1_CIPHER_RC4;
98 		break;
99 	case IEEE80211_CIPHER_AES_CCM:
100 		cipher = RTWN_TXDW1_CIPHER_AES;
101 		break;
102 	default:
103 		KASSERT(0, ("%s: unknown cipher %d\n", __func__,
104 		    ic_cipher));
105 		return (RTWN_TXDW1_CIPHER_SM4);
106 	}
107 
108 	return (cipher);
109 }
110 
111 static int
112 rtwn_tx_data(struct rtwn_softc *sc, struct ieee80211_node *ni,
113     struct mbuf *m)
114 {
115 	const struct ieee80211_txparam *tp;
116 	struct ieee80211com *ic = &sc->sc_ic;
117 	struct ieee80211vap *vap = ni->ni_vap;
118 	struct ieee80211_key *k = NULL;
119 	struct ieee80211_channel *chan;
120 	struct ieee80211_frame *wh;
121 	struct rtwn_tx_desc_common *txd;
122 	struct rtwn_tx_buf buf;
123 	uint8_t rate, ridx, type;
124 	u_int cipher;
125 	int ismcast, maxretry;
126 
127 	RTWN_ASSERT_LOCKED(sc);
128 
129 	wh = mtod(m, struct ieee80211_frame *);
130 	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
131 	ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
132 
133 	chan = (ni->ni_chan != IEEE80211_CHAN_ANYC) ?
134 		ni->ni_chan : ic->ic_curchan;
135 	tp = &vap->iv_txparms[ieee80211_chan2mode(chan)];
136 	maxretry = tp->maxretry;
137 
138 	/* Choose a TX rate index. */
139 	if (type == IEEE80211_FC0_TYPE_MGT)
140 		rate = tp->mgmtrate;
141 	else if (ismcast)
142 		rate = tp->mcastrate;
143 	else if (tp->ucastrate != IEEE80211_FIXED_RATE_NONE)
144 		rate = tp->ucastrate;
145 	else if (m->m_flags & M_EAPOL)
146 		rate = tp->mgmtrate;
147 	else {
148 		if (sc->sc_ratectl == RTWN_RATECTL_NET80211) {
149 			/* XXX pass pktlen */
150 			(void) ieee80211_ratectl_rate(ni, NULL, 0);
151 			rate = ni->ni_txrate;
152 		} else {
153 			if (ni->ni_flags & IEEE80211_NODE_HT)
154 				rate = IEEE80211_RATE_MCS | 0x4; /* MCS4 */
155 			else if (ic->ic_curmode != IEEE80211_MODE_11B)
156 				rate = ridx2rate[RTWN_RIDX_OFDM36];
157 			else
158 				rate = ridx2rate[RTWN_RIDX_CCK55];
159 		}
160 	}
161 
162 	ridx = rate2ridx(rate);
163 
164 	cipher = IEEE80211_CIPHER_NONE;
165 	if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
166 		k = ieee80211_crypto_encap(ni, m);
167 		if (k == NULL) {
168 			device_printf(sc->sc_dev,
169 			    "ieee80211_crypto_encap returns NULL.\n");
170 			return (ENOBUFS);
171 		}
172 		if (!(k->wk_flags & IEEE80211_KEY_SWCRYPT))
173 			cipher = k->wk_cipher->ic_cipher;
174 
175 		/* in case packet header moved, reset pointer */
176 		wh = mtod(m, struct ieee80211_frame *);
177 	}
178 
179 	/* Fill Tx descriptor. */
180 	txd = (struct rtwn_tx_desc_common *)&buf;
181 	memset(txd, 0, sc->txdesc_len);
182 	txd->txdw1 = htole32(SM(RTWN_TXDW1_CIPHER, rtwn_get_cipher(cipher)));
183 
184 	rtwn_fill_tx_desc(sc, ni, m, txd, ridx, maxretry);
185 
186 	if (ieee80211_radiotap_active_vap(vap)) {
187 		struct rtwn_tx_radiotap_header *tap = &sc->sc_txtap;
188 
189 		tap->wt_flags = rtwn_tx_radiotap_flags(sc, txd);
190 		if (k != NULL)
191 			tap->wt_flags |= IEEE80211_RADIOTAP_F_WEP;
192 		ieee80211_radiotap_tx(vap, m);
193 	}
194 
195 	return (rtwn_tx_start(sc, ni, m, (uint8_t *)txd, type, 0));
196 }
197 
198 static int
199 rtwn_tx_raw(struct rtwn_softc *sc, struct ieee80211_node *ni,
200     struct mbuf *m, const struct ieee80211_bpf_params *params)
201 {
202 	struct ieee80211vap *vap = ni->ni_vap;
203 	struct ieee80211_key *k = NULL;
204 	struct ieee80211_frame *wh;
205 	struct rtwn_tx_desc_common *txd;
206 	struct rtwn_tx_buf buf;
207 	uint8_t type;
208 	u_int cipher;
209 
210 	/* Encrypt the frame if need be. */
211 	cipher = IEEE80211_CIPHER_NONE;
212 	if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
213 		/* Retrieve key for TX. */
214 		k = ieee80211_crypto_encap(ni, m);
215 		if (k == NULL) {
216 			device_printf(sc->sc_dev,
217 			    "ieee80211_crypto_encap returns NULL.\n");
218 			return (ENOBUFS);
219 		}
220 		if (!(k->wk_flags & IEEE80211_KEY_SWCRYPT))
221 			cipher = k->wk_cipher->ic_cipher;
222 	}
223 
224 	wh = mtod(m, struct ieee80211_frame *);
225 	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
226 
227 	/* Fill Tx descriptor. */
228 	txd = (struct rtwn_tx_desc_common *)&buf;
229 	memset(txd, 0, sc->txdesc_len);
230 	txd->txdw1 = htole32(SM(RTWN_TXDW1_CIPHER, rtwn_get_cipher(cipher)));
231 
232 	rtwn_fill_tx_desc_raw(sc, ni, m, txd, params);
233 
234 	if (ieee80211_radiotap_active_vap(vap)) {
235 		struct rtwn_tx_radiotap_header *tap = &sc->sc_txtap;
236 
237 		tap->wt_flags = rtwn_tx_radiotap_flags(sc, txd);
238 		if (k != NULL)
239 			tap->wt_flags |= IEEE80211_RADIOTAP_F_WEP;
240 		ieee80211_radiotap_tx(vap, m);
241 	}
242 
243 	return (rtwn_tx_start(sc, ni, m, (uint8_t *)txd, type, 0));
244 }
245 
246 int
247 rtwn_transmit(struct ieee80211com *ic, struct mbuf *m)
248 {
249 	struct rtwn_softc *sc = ic->ic_softc;
250 	int error;
251 
252 	RTWN_LOCK(sc);
253 	if ((sc->sc_flags & RTWN_RUNNING) == 0) {
254 		RTWN_UNLOCK(sc);
255 		return (ENXIO);
256 	}
257 	error = mbufq_enqueue(&sc->sc_snd, m);
258 	if (error) {
259 		RTWN_UNLOCK(sc);
260 		return (error);
261 	}
262 	rtwn_start(sc);
263 	RTWN_UNLOCK(sc);
264 
265 	return (0);
266 }
267 
268 void
269 rtwn_start(struct rtwn_softc *sc)
270 {
271 	struct ieee80211_node *ni;
272 	struct mbuf *m;
273 
274 	RTWN_ASSERT_LOCKED(sc);
275 	while ((m = mbufq_dequeue(&sc->sc_snd)) != NULL) {
276 		if (sc->qfullmsk != 0) {
277 			mbufq_prepend(&sc->sc_snd, m);
278 			break;
279 		}
280 		ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
281 		m->m_pkthdr.rcvif = NULL;
282 
283 		RTWN_DPRINTF(sc, RTWN_DEBUG_XMIT,
284 		    "%s: called; m %p, ni %p\n", __func__, m, ni);
285 
286 		if (rtwn_tx_data(sc, ni, m) != 0) {
287 			if_inc_counter(ni->ni_vap->iv_ifp,
288 			    IFCOUNTER_OERRORS, 1);
289 			m_freem(m);
290 #ifdef D4054
291 			ieee80211_tx_watchdog_refresh(ni->ni_ic, -1, 0);
292 #endif
293 			ieee80211_free_node(ni);
294 			break;
295 		}
296 	}
297 }
298 
299 int
300 rtwn_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
301     const struct ieee80211_bpf_params *params)
302 {
303 	struct ieee80211com *ic = ni->ni_ic;
304 	struct rtwn_softc *sc = ic->ic_softc;
305 	int error;
306 
307 	RTWN_DPRINTF(sc, RTWN_DEBUG_XMIT, "%s: called; m %p, ni %p\n",
308 	    __func__, m, ni);
309 
310 	/* prevent management frames from being sent if we're not ready */
311 	RTWN_LOCK(sc);
312 	if (!(sc->sc_flags & RTWN_RUNNING)) {
313 		error = ENETDOWN;
314 		goto end;
315 	}
316 
317 	if (sc->qfullmsk != 0) {
318 		error = ENOBUFS;
319 		goto end;
320 	}
321 
322 	if (params == NULL) {
323 		/*
324 		 * Legacy path; interpret frame contents to decide
325 		 * precisely how to send the frame.
326 		 */
327 		error = rtwn_tx_data(sc, ni, m);
328 	} else {
329 		/*
330 		 * Caller supplied explicit parameters to use in
331 		 * sending the frame.
332 		 */
333 		error = rtwn_tx_raw(sc, ni, m, params);
334 	}
335 
336 end:
337 	if (error != 0) {
338 		if (m->m_flags & M_TXCB)
339 			ieee80211_process_callback(ni, m, 1);
340 		m_freem(m);
341 	}
342 
343 	RTWN_UNLOCK(sc);
344 
345 	return (error);
346 }
347