xref: /freebsd/sys/dev/rtwn/if_rtwn_tx.c (revision 95ee2897e98f5d444f26ed2334cc7c439f9c16c6) 
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 void
60 rtwn_drain_mbufq(struct rtwn_softc *sc)
61 {
62 	struct mbuf *m;
63 	struct ieee80211_node *ni;
64 	RTWN_ASSERT_LOCKED(sc);
65 	while ((m = mbufq_dequeue(&sc->sc_snd)) != NULL) {
66 		ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
67 		m->m_pkthdr.rcvif = NULL;
68 		ieee80211_free_node(ni);
69 		m_freem(m);
70 	}
71 }
72 
73 #ifdef IEEE80211_SUPPORT_SUPERG
74 void
75 rtwn_ff_flush_all(struct rtwn_softc *sc, union sec_param *data)
76 {
77 	struct ieee80211com *ic = &sc->sc_ic;
78 
79 	RTWN_UNLOCK(sc);
80 	ieee80211_ff_flush_all(ic);
81 	RTWN_LOCK(sc);
82 }
83 #endif
84 
85 static uint8_t
86 rtwn_get_cipher(u_int ic_cipher)
87 {
88 	uint8_t cipher;
89 
90 	switch (ic_cipher) {
91 	case IEEE80211_CIPHER_NONE:
92 		cipher = RTWN_TXDW1_CIPHER_NONE;
93 		break;
94 	case IEEE80211_CIPHER_WEP:
95 	case IEEE80211_CIPHER_TKIP:
96 		cipher = RTWN_TXDW1_CIPHER_RC4;
97 		break;
98 	case IEEE80211_CIPHER_AES_CCM:
99 		cipher = RTWN_TXDW1_CIPHER_AES;
100 		break;
101 	default:
102 		KASSERT(0, ("%s: unknown cipher %d\n", __func__,
103 		    ic_cipher));
104 		return (RTWN_TXDW1_CIPHER_SM4);
105 	}
106 
107 	return (cipher);
108 }
109 
110 static int
111 rtwn_tx_data(struct rtwn_softc *sc, struct ieee80211_node *ni,
112     struct mbuf *m)
113 {
114 	const struct ieee80211_txparam *tp = ni->ni_txparms;
115 	struct ieee80211com *ic = &sc->sc_ic;
116 	struct ieee80211vap *vap = ni->ni_vap;
117 	struct ieee80211_key *k = NULL;
118 	struct ieee80211_frame *wh;
119 	struct rtwn_tx_desc_common *txd;
120 	struct rtwn_tx_buf buf;
121 	uint8_t rate, ridx, type;
122 	u_int cipher;
123 	int ismcast;
124 
125 	RTWN_ASSERT_LOCKED(sc);
126 
127 	wh = mtod(m, struct ieee80211_frame *);
128 	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
129 	ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
130 
131 	/* Choose a TX rate index. */
132 	if (type == IEEE80211_FC0_TYPE_MGT ||
133 	    type == IEEE80211_FC0_TYPE_CTL ||
134 	    (m->m_flags & M_EAPOL) != 0)
135 		rate = tp->mgmtrate;
136 	else if (ismcast)
137 		rate = tp->mcastrate;
138 	else if (tp->ucastrate != IEEE80211_FIXED_RATE_NONE)
139 		rate = tp->ucastrate;
140 	else {
141 		if (sc->sc_ratectl == RTWN_RATECTL_NET80211) {
142 			/* XXX pass pktlen */
143 			(void) ieee80211_ratectl_rate(ni, NULL, 0);
144 			rate = ni->ni_txrate;
145 		} else {
146 			if (ni->ni_flags & IEEE80211_NODE_HT)
147 				rate = IEEE80211_RATE_MCS | 0x4; /* MCS4 */
148 			else if (ic->ic_curmode != IEEE80211_MODE_11B)
149 				rate = ridx2rate[RTWN_RIDX_OFDM36];
150 			else
151 				rate = ridx2rate[RTWN_RIDX_CCK55];
152 		}
153 	}
154 
155 	ridx = rate2ridx(rate);
156 
157 	cipher = IEEE80211_CIPHER_NONE;
158 	if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
159 		k = ieee80211_crypto_encap(ni, m);
160 		if (k == NULL) {
161 			device_printf(sc->sc_dev,
162 			    "ieee80211_crypto_encap returns NULL.\n");
163 			return (ENOBUFS);
164 		}
165 		if (!(k->wk_flags & IEEE80211_KEY_SWCRYPT))
166 			cipher = k->wk_cipher->ic_cipher;
167 
168 		/* in case packet header moved, reset pointer */
169 		wh = mtod(m, struct ieee80211_frame *);
170 	}
171 
172 	/* Fill Tx descriptor. */
173 	txd = (struct rtwn_tx_desc_common *)&buf;
174 	memset(txd, 0, sc->txdesc_len);
175 	txd->txdw1 = htole32(SM(RTWN_TXDW1_CIPHER, rtwn_get_cipher(cipher)));
176 
177 	rtwn_fill_tx_desc(sc, ni, m, txd, ridx, tp->maxretry);
178 
179 	if (ieee80211_radiotap_active_vap(vap)) {
180 		struct rtwn_tx_radiotap_header *tap = &sc->sc_txtap;
181 
182 		tap->wt_flags = rtwn_tx_radiotap_flags(sc, txd);
183 		if (k != NULL)
184 			tap->wt_flags |= IEEE80211_RADIOTAP_F_WEP;
185 		ieee80211_radiotap_tx(vap, m);
186 	}
187 
188 	return (rtwn_tx_start(sc, ni, m, (uint8_t *)txd, type, 0));
189 }
190 
191 static int
192 rtwn_tx_raw(struct rtwn_softc *sc, struct ieee80211_node *ni,
193     struct mbuf *m, const struct ieee80211_bpf_params *params)
194 {
195 	struct ieee80211vap *vap = ni->ni_vap;
196 	struct ieee80211_key *k = NULL;
197 	struct ieee80211_frame *wh;
198 	struct rtwn_tx_desc_common *txd;
199 	struct rtwn_tx_buf buf;
200 	uint8_t type;
201 	u_int cipher;
202 
203 	/* Encrypt the frame if need be. */
204 	cipher = IEEE80211_CIPHER_NONE;
205 	if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
206 		/* Retrieve key for TX. */
207 		k = ieee80211_crypto_encap(ni, m);
208 		if (k == NULL) {
209 			device_printf(sc->sc_dev,
210 			    "ieee80211_crypto_encap returns NULL.\n");
211 			return (ENOBUFS);
212 		}
213 		if (!(k->wk_flags & IEEE80211_KEY_SWCRYPT))
214 			cipher = k->wk_cipher->ic_cipher;
215 	}
216 
217 	wh = mtod(m, struct ieee80211_frame *);
218 	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
219 
220 	/* Fill Tx descriptor. */
221 	txd = (struct rtwn_tx_desc_common *)&buf;
222 	memset(txd, 0, sc->txdesc_len);
223 	txd->txdw1 = htole32(SM(RTWN_TXDW1_CIPHER, rtwn_get_cipher(cipher)));
224 
225 	rtwn_fill_tx_desc_raw(sc, ni, m, txd, params);
226 
227 	if (ieee80211_radiotap_active_vap(vap)) {
228 		struct rtwn_tx_radiotap_header *tap = &sc->sc_txtap;
229 
230 		tap->wt_flags = rtwn_tx_radiotap_flags(sc, txd);
231 		if (k != NULL)
232 			tap->wt_flags |= IEEE80211_RADIOTAP_F_WEP;
233 		ieee80211_radiotap_tx(vap, m);
234 	}
235 
236 	return (rtwn_tx_start(sc, ni, m, (uint8_t *)txd, type, 0));
237 }
238 
239 int
240 rtwn_transmit(struct ieee80211com *ic, struct mbuf *m)
241 {
242 	struct rtwn_softc *sc = ic->ic_softc;
243 	int error;
244 
245 	RTWN_LOCK(sc);
246 	if ((sc->sc_flags & RTWN_RUNNING) == 0) {
247 		RTWN_UNLOCK(sc);
248 		return (ENXIO);
249 	}
250 	error = mbufq_enqueue(&sc->sc_snd, m);
251 	if (error) {
252 		RTWN_UNLOCK(sc);
253 		return (error);
254 	}
255 	rtwn_start(sc);
256 	RTWN_UNLOCK(sc);
257 
258 	return (0);
259 }
260 
261 void
262 rtwn_start(struct rtwn_softc *sc)
263 {
264 	struct ieee80211_node *ni;
265 	struct mbuf *m;
266 
267 	RTWN_ASSERT_LOCKED(sc);
268 	while ((m = mbufq_dequeue(&sc->sc_snd)) != NULL) {
269 		if (sc->qfullmsk != 0) {
270 			mbufq_prepend(&sc->sc_snd, m);
271 			break;
272 		}
273 		ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
274 		m->m_pkthdr.rcvif = NULL;
275 
276 		RTWN_DPRINTF(sc, RTWN_DEBUG_XMIT,
277 		    "%s: called; m %p, ni %p\n", __func__, m, ni);
278 
279 		if (rtwn_tx_data(sc, ni, m) != 0) {
280 			if_inc_counter(ni->ni_vap->iv_ifp,
281 			    IFCOUNTER_OERRORS, 1);
282 			m_freem(m);
283 #ifdef D4054
284 			ieee80211_tx_watchdog_refresh(ni->ni_ic, -1, 0);
285 #endif
286 			ieee80211_free_node(ni);
287 			break;
288 		}
289 	}
290 }
291 
292 int
293 rtwn_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
294     const struct ieee80211_bpf_params *params)
295 {
296 	struct ieee80211com *ic = ni->ni_ic;
297 	struct rtwn_softc *sc = ic->ic_softc;
298 	int error;
299 
300 	RTWN_DPRINTF(sc, RTWN_DEBUG_XMIT, "%s: called; m %p, ni %p\n",
301 	    __func__, m, ni);
302 
303 	/* prevent management frames from being sent if we're not ready */
304 	RTWN_LOCK(sc);
305 	if (!(sc->sc_flags & RTWN_RUNNING)) {
306 		error = ENETDOWN;
307 		goto end;
308 	}
309 
310 	if (sc->qfullmsk != 0) {
311 		error = ENOBUFS;
312 		goto end;
313 	}
314 
315 	if (params == NULL) {
316 		/*
317 		 * Legacy path; interpret frame contents to decide
318 		 * precisely how to send the frame.
319 		 */
320 		error = rtwn_tx_data(sc, ni, m);
321 	} else {
322 		/*
323 		 * Caller supplied explicit parameters to use in
324 		 * sending the frame.
325 		 */
326 		error = rtwn_tx_raw(sc, ni, m, params);
327 	}
328 
329 end:
330 	if (error != 0) {
331 		if (m->m_flags & M_TXCB)
332 			ieee80211_process_callback(ni, m, 1);
333 		m_freem(m);
334 	}
335 
336 	RTWN_UNLOCK(sc);
337 
338 	return (error);
339 }
340