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 #include "opt_wlan.h" 23 24 #include <sys/param.h> 25 #include <sys/lock.h> 26 #include <sys/mutex.h> 27 #include <sys/mbuf.h> 28 #include <sys/kernel.h> 29 #include <sys/socket.h> 30 #include <sys/systm.h> 31 #include <sys/malloc.h> 32 #include <sys/queue.h> 33 #include <sys/taskqueue.h> 34 #include <sys/bus.h> 35 #include <sys/endian.h> 36 #include <sys/linker.h> 37 38 #include <net/if.h> 39 #include <net/ethernet.h> 40 #include <net/if_media.h> 41 42 #include <net80211/ieee80211_var.h> 43 #include <net80211/ieee80211_radiotap.h> 44 45 #include <dev/rtwn/if_rtwnreg.h> 46 #include <dev/rtwn/if_rtwnvar.h> 47 48 #include <dev/rtwn/if_rtwn_ridx.h> 49 #include <dev/rtwn/if_rtwn_tx.h> 50 51 #include <dev/rtwn/rtl8192c/r92c.h> 52 #include <dev/rtwn/rtl8192c/r92c_var.h> 53 #include <dev/rtwn/rtl8192c/r92c_tx_desc.h> 54 55 static int 56 r92c_tx_get_sco(struct rtwn_softc *sc, struct ieee80211_channel *c) 57 { 58 if (IEEE80211_IS_CHAN_HT40U(c)) 59 return (R92C_TXDW4_SCO_SCA); 60 else 61 return (R92C_TXDW4_SCO_SCB); 62 } 63 64 static void 65 r92c_tx_set_ht40(struct rtwn_softc *sc, void *buf, struct ieee80211_node *ni) 66 { 67 struct r92c_tx_desc *txd = (struct r92c_tx_desc *)buf; 68 69 if (ni->ni_chan != IEEE80211_CHAN_ANYC && 70 IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 71 int extc_offset; 72 73 extc_offset = r92c_tx_get_sco(sc, ni->ni_chan); 74 txd->txdw4 |= htole32(R92C_TXDW4_DATA_BW40); 75 txd->txdw4 |= htole32(SM(R92C_TXDW4_DATA_SCO, extc_offset)); 76 } 77 } 78 79 static void 80 r92c_tx_protection(struct rtwn_softc *sc, struct r92c_tx_desc *txd, 81 enum ieee80211_protmode mode, uint8_t ridx) 82 { 83 struct ieee80211com *ic = &sc->sc_ic; 84 uint8_t rate; 85 86 switch (mode) { 87 case IEEE80211_PROT_CTSONLY: 88 txd->txdw4 |= htole32(R92C_TXDW4_CTS2SELF); 89 break; 90 case IEEE80211_PROT_RTSCTS: 91 txd->txdw4 |= htole32(R92C_TXDW4_RTSEN); 92 break; 93 default: 94 break; 95 } 96 97 if (mode == IEEE80211_PROT_CTSONLY || 98 mode == IEEE80211_PROT_RTSCTS) { 99 if (ridx >= RTWN_RIDX_HT_MCS(0)) 100 rate = rtwn_ctl_mcsrate(ic->ic_rt, ridx); 101 else 102 rate = ieee80211_ctl_rate(ic->ic_rt, ridx2rate[ridx]); 103 ridx = rate2ridx(IEEE80211_RV(rate)); 104 105 txd->txdw4 |= htole32(SM(R92C_TXDW4_RTSRATE, ridx)); 106 /* RTS rate fallback limit (max). */ 107 txd->txdw5 |= htole32(SM(R92C_TXDW5_RTSRATE_FB_LMT, 0xf)); 108 109 if (RTWN_RATE_IS_CCK(ridx) && ridx != RTWN_RIDX_CCK1 && 110 (ic->ic_flags & IEEE80211_F_SHPREAMBLE)) 111 txd->txdw4 |= htole32(R92C_TXDW4_RTS_SHORT); 112 } 113 } 114 115 static void 116 r92c_tx_raid(struct rtwn_softc *sc, struct r92c_tx_desc *txd, 117 struct ieee80211_node *ni, int ismcast) 118 { 119 struct ieee80211com *ic = &sc->sc_ic; 120 struct ieee80211vap *vap = ni->ni_vap; 121 struct ieee80211_channel *chan; 122 enum ieee80211_phymode mode; 123 uint8_t raid; 124 125 chan = (ni->ni_chan != IEEE80211_CHAN_ANYC) ? 126 ni->ni_chan : ic->ic_curchan; 127 mode = ieee80211_chan2mode(chan); 128 129 /* NB: group addressed frames are done at 11bg rates for now */ 130 if (ismcast || !(ni->ni_flags & IEEE80211_NODE_HT)) { 131 switch (mode) { 132 case IEEE80211_MODE_11B: 133 case IEEE80211_MODE_11G: 134 break; 135 case IEEE80211_MODE_11NG: 136 mode = IEEE80211_MODE_11G; 137 break; 138 default: 139 device_printf(sc->sc_dev, "unknown mode(1) %d!\n", 140 ic->ic_curmode); 141 return; 142 } 143 } 144 145 switch (mode) { 146 case IEEE80211_MODE_11B: 147 raid = R92C_RAID_11B; 148 break; 149 case IEEE80211_MODE_11G: 150 if (vap->iv_flags & IEEE80211_F_PUREG) 151 raid = R92C_RAID_11G; 152 else 153 raid = R92C_RAID_11BG; 154 break; 155 case IEEE80211_MODE_11NG: 156 if (vap->iv_flags_ht & IEEE80211_FHT_PUREN) 157 raid = R92C_RAID_11N; 158 else 159 raid = R92C_RAID_11BGN; 160 break; 161 default: 162 device_printf(sc->sc_dev, "unknown mode(2) %d!\n", mode); 163 return; 164 } 165 166 txd->txdw1 |= htole32(SM(R92C_TXDW1_RAID, raid)); 167 } 168 169 /* XXX move to device-independent layer */ 170 static void 171 r92c_tx_set_sgi(struct rtwn_softc *sc, void *buf, struct ieee80211_node *ni) 172 { 173 struct r92c_tx_desc *txd = (struct r92c_tx_desc *)buf; 174 175 /* 176 * Only enable short-GI if we're transmitting in that 177 * width to that node. 178 * 179 * Specifically, do not enable shortgi for 20MHz if 180 * we're attempting to transmit at 40MHz. 181 */ 182 if (ieee80211_ht_check_tx_ht40(ni)) { 183 if (ieee80211_ht_check_tx_shortgi_40(ni)) 184 txd->txdw5 |= htole32(R92C_TXDW5_SGI); 185 } else if (ieee80211_ht_check_tx_ht(ni)) { 186 if (ieee80211_ht_check_tx_shortgi_20(ni)) 187 txd->txdw5 |= htole32(R92C_TXDW5_SGI); 188 } 189 } 190 191 void 192 r92c_tx_enable_ampdu(void *buf, int enable) 193 { 194 struct r92c_tx_desc *txd = (struct r92c_tx_desc *)buf; 195 196 if (enable) 197 txd->txdw1 |= htole32(R92C_TXDW1_AGGEN); 198 else 199 txd->txdw1 |= htole32(R92C_TXDW1_AGGBK); 200 } 201 202 void 203 r92c_tx_setup_hwseq(void *buf) 204 { 205 struct r92c_tx_desc *txd = (struct r92c_tx_desc *)buf; 206 207 txd->txdw4 |= htole32(R92C_TXDW4_HWSEQ_EN); 208 } 209 210 void 211 r92c_tx_setup_macid(void *buf, int id) 212 { 213 struct r92c_tx_desc *txd = (struct r92c_tx_desc *)buf; 214 215 txd->txdw1 |= htole32(SM(R92C_TXDW1_MACID, id)); 216 217 /* XXX does not belong here */ 218 /* XXX temporary (I hope) */ 219 /* Force CCK1 for RTS / CTS frames (driver bug) */ 220 txd->txdw4 &= ~htole32(SM(R92C_TXDW4_RTSRATE, R92C_TXDW4_RTSRATE_M)); 221 txd->txdw4 &= ~htole32(R92C_TXDW4_RTS_SHORT); 222 } 223 224 void 225 r92c_fill_tx_desc(struct rtwn_softc *sc, struct ieee80211_node *ni, 226 struct mbuf *m, void *buf, uint8_t ridx, int maxretry) 227 { 228 #ifndef RTWN_WITHOUT_UCODE 229 struct r92c_softc *rs = sc->sc_priv; 230 #endif 231 struct ieee80211com *ic = &sc->sc_ic; 232 struct ieee80211vap *vap = ni->ni_vap; 233 struct rtwn_vap *uvp = RTWN_VAP(vap); 234 struct ieee80211_frame *wh; 235 struct r92c_tx_desc *txd; 236 enum ieee80211_protmode prot; 237 uint8_t type, tid, qos, qsel; 238 int hasqos, ismcast, macid; 239 240 wh = mtod(m, struct ieee80211_frame *); 241 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 242 hasqos = IEEE80211_QOS_HAS_SEQ(wh); 243 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1); 244 245 /* Select TX ring for this frame. */ 246 if (hasqos) { 247 qos = ((const struct ieee80211_qosframe *)wh)->i_qos[0]; 248 tid = qos & IEEE80211_QOS_TID; 249 } else { 250 qos = 0; 251 tid = 0; 252 } 253 254 /* Fill Tx descriptor. */ 255 txd = (struct r92c_tx_desc *)buf; 256 txd->flags0 |= R92C_FLAGS0_LSG | R92C_FLAGS0_FSG; 257 if (ismcast) 258 txd->flags0 |= R92C_FLAGS0_BMCAST; 259 260 if (!ismcast) { 261 /* Unicast frame, check if an ACK is expected. */ 262 if (!qos || (qos & IEEE80211_QOS_ACKPOLICY) != 263 IEEE80211_QOS_ACKPOLICY_NOACK) { 264 txd->txdw5 |= htole32(R92C_TXDW5_RTY_LMT_ENA); 265 txd->txdw5 |= htole32(SM(R92C_TXDW5_RTY_LMT, 266 maxretry)); 267 } 268 269 struct rtwn_node *un = RTWN_NODE(ni); 270 macid = un->id; 271 272 if (type == IEEE80211_FC0_TYPE_DATA) { 273 qsel = tid % RTWN_MAX_TID; 274 275 rtwn_r92c_tx_enable_ampdu(sc, buf, 276 (m->m_flags & M_AMPDU_MPDU) != 0); 277 if (m->m_flags & M_AMPDU_MPDU) { 278 txd->txdw2 |= htole32(SM(R92C_TXDW2_AMPDU_DEN, 279 vap->iv_ampdu_density)); 280 txd->txdw6 |= htole32(SM(R92C_TXDW6_MAX_AGG, 281 0x1f)); /* XXX */ 282 } 283 if (sc->sc_ratectl == RTWN_RATECTL_NET80211) { 284 txd->txdw2 |= htole32(R92C_TXDW2_CCX_RPT); 285 sc->sc_tx_n_active++; 286 #ifndef RTWN_WITHOUT_UCODE 287 rs->rs_c2h_pending++; 288 #endif 289 } 290 291 if (RTWN_RATE_IS_CCK(ridx) && ridx != RTWN_RIDX_CCK1 && 292 (ic->ic_flags & IEEE80211_F_SHPREAMBLE)) 293 txd->txdw4 |= htole32(R92C_TXDW4_DATA_SHPRE); 294 295 prot = IEEE80211_PROT_NONE; 296 if (ridx >= RTWN_RIDX_HT_MCS(0)) { 297 r92c_tx_set_ht40(sc, txd, ni); 298 r92c_tx_set_sgi(sc, txd, ni); 299 prot = ic->ic_htprotmode; 300 } else if (ic->ic_flags & IEEE80211_F_USEPROT) 301 prot = ic->ic_protmode; 302 303 /* XXX fix last comparison for A-MSDU (in net80211) */ 304 /* XXX A-MPDU? */ 305 if (m->m_pkthdr.len + IEEE80211_CRC_LEN > 306 vap->iv_rtsthreshold && 307 vap->iv_rtsthreshold != IEEE80211_RTS_MAX) 308 prot = IEEE80211_PROT_RTSCTS; 309 310 /* NB: checks for ht40 / short bits (set above). */ 311 if (prot != IEEE80211_PROT_NONE) 312 r92c_tx_protection(sc, txd, prot, ridx); 313 } else /* IEEE80211_FC0_TYPE_MGT */ 314 qsel = R92C_TXDW1_QSEL_MGNT; 315 } else { 316 macid = RTWN_MACID_BC; 317 qsel = R92C_TXDW1_QSEL_MGNT; 318 } 319 320 txd->txdw1 |= htole32(SM(R92C_TXDW1_QSEL, qsel)); 321 322 rtwn_r92c_tx_setup_macid(sc, txd, macid); 323 txd->txdw5 |= htole32(SM(R92C_TXDW5_DATARATE, ridx)); 324 /* Data rate fallback limit (max). */ 325 txd->txdw5 |= htole32(SM(R92C_TXDW5_DATARATE_FB_LMT, 0x1f)); 326 txd->txdw4 |= htole32(SM(R92C_TXDW4_PORT_ID, uvp->id)); 327 r92c_tx_raid(sc, txd, ni, ismcast); 328 329 /* Force this rate if needed. */ 330 if (sc->sc_ratectl != RTWN_RATECTL_FW) 331 txd->txdw4 |= htole32(R92C_TXDW4_DRVRATE); 332 333 if (!hasqos) { 334 /* Use HW sequence numbering for non-QoS frames. */ 335 rtwn_r92c_tx_setup_hwseq(sc, txd); 336 txd->txdw4 |= htole32(SM(R92C_TXDW4_SEQ_SEL, uvp->id)); 337 } else { 338 uint16_t seqno; 339 340 if (m->m_flags & M_AMPDU_MPDU) { 341 seqno = ni->ni_txseqs[tid] % IEEE80211_SEQ_RANGE; 342 ni->ni_txseqs[tid]++; 343 } else 344 seqno = M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE; 345 346 /* Set sequence number. */ 347 txd->txdseq = htole16(seqno); 348 } 349 } 350 351 void 352 r92c_fill_tx_desc_raw(struct rtwn_softc *sc, struct ieee80211_node *ni, 353 struct mbuf *m, void *buf, const struct ieee80211_bpf_params *params) 354 { 355 struct ieee80211vap *vap = ni->ni_vap; 356 struct rtwn_vap *uvp = RTWN_VAP(vap); 357 struct ieee80211_frame *wh; 358 struct r92c_tx_desc *txd; 359 uint8_t ridx; 360 int ismcast; 361 362 /* XXX TODO: 11n checks, matching r92c_fill_tx_desc() */ 363 364 wh = mtod(m, struct ieee80211_frame *); 365 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1); 366 ridx = rate2ridx(params->ibp_rate0); 367 368 /* Fill Tx descriptor. */ 369 txd = (struct r92c_tx_desc *)buf; 370 txd->flags0 |= R92C_FLAGS0_LSG | R92C_FLAGS0_FSG; 371 if (ismcast) 372 txd->flags0 |= R92C_FLAGS0_BMCAST; 373 374 if ((params->ibp_flags & IEEE80211_BPF_NOACK) == 0) { 375 txd->txdw5 |= htole32(R92C_TXDW5_RTY_LMT_ENA); 376 txd->txdw5 |= htole32(SM(R92C_TXDW5_RTY_LMT, 377 params->ibp_try0)); 378 } 379 if (params->ibp_flags & IEEE80211_BPF_RTS) 380 r92c_tx_protection(sc, txd, IEEE80211_PROT_RTSCTS, ridx); 381 if (params->ibp_flags & IEEE80211_BPF_CTS) 382 r92c_tx_protection(sc, txd, IEEE80211_PROT_CTSONLY, ridx); 383 384 rtwn_r92c_tx_setup_macid(sc, txd, RTWN_MACID_BC); 385 txd->txdw1 |= htole32(SM(R92C_TXDW1_QSEL, R92C_TXDW1_QSEL_MGNT)); 386 387 /* Set TX rate index. */ 388 txd->txdw5 |= htole32(SM(R92C_TXDW5_DATARATE, ridx)); 389 txd->txdw5 |= htole32(SM(R92C_TXDW5_DATARATE_FB_LMT, 0x1f)); 390 txd->txdw4 |= htole32(SM(R92C_TXDW4_PORT_ID, uvp->id)); 391 txd->txdw4 |= htole32(R92C_TXDW4_DRVRATE); 392 r92c_tx_raid(sc, txd, ni, ismcast); 393 394 if (!IEEE80211_QOS_HAS_SEQ(wh)) { 395 /* Use HW sequence numbering for non-QoS frames. */ 396 rtwn_r92c_tx_setup_hwseq(sc, txd); 397 txd->txdw4 |= htole32(SM(R92C_TXDW4_SEQ_SEL, uvp->id)); 398 } else { 399 /* Set sequence number. */ 400 txd->txdseq |= htole16(M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE); 401 } 402 } 403 404 void 405 r92c_fill_tx_desc_null(struct rtwn_softc *sc, void *buf, int is11b, 406 int qos, int id) 407 { 408 struct r92c_tx_desc *txd = (struct r92c_tx_desc *)buf; 409 410 txd->flags0 = R92C_FLAGS0_FSG | R92C_FLAGS0_LSG | R92C_FLAGS0_OWN; 411 txd->txdw1 = htole32( 412 SM(R92C_TXDW1_QSEL, R92C_TXDW1_QSEL_MGNT)); 413 414 txd->txdw4 = htole32(R92C_TXDW4_DRVRATE); 415 txd->txdw4 |= htole32(SM(R92C_TXDW4_PORT_ID, id)); 416 if (is11b) { 417 txd->txdw5 = htole32(SM(R92C_TXDW5_DATARATE, 418 RTWN_RIDX_CCK1)); 419 } else { 420 txd->txdw5 = htole32(SM(R92C_TXDW5_DATARATE, 421 RTWN_RIDX_OFDM6)); 422 } 423 424 if (!qos) { 425 rtwn_r92c_tx_setup_hwseq(sc, txd); 426 txd->txdw4 |= htole32(SM(R92C_TXDW4_SEQ_SEL, id)); 427 } 428 } 429 430 uint8_t 431 r92c_tx_radiotap_flags(const void *buf) 432 { 433 const struct r92c_tx_desc *txd = buf; 434 uint8_t flags; 435 436 flags = 0; 437 if (txd->txdw4 & htole32(R92C_TXDW4_DATA_SHPRE)) 438 flags |= IEEE80211_RADIOTAP_F_SHORTPRE; 439 if (txd->txdw5 & htole32(R92C_TXDW5_SGI)) 440 flags |= IEEE80211_RADIOTAP_F_SHORTGI; 441 return (flags); 442 } 443