1 /*-
2 * Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer,
10 * without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
13 * redistribution must be conditioned upon including a substantially
14 * similar Disclaimer requirement for further binary redistribution.
15 *
16 * NO WARRANTY
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGES.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: stable/10/sys/dev/ath/if_ath_tx_ht.c 250665 2013-05-15 18:33:05Z adrian $");
32
33 #include "opt_inet.h"
34 #include "opt_ath.h"
35 #include "opt_wlan.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/sysctl.h>
40 #include <sys/mbuf.h>
41 #include <sys/malloc.h>
42 #include <sys/lock.h>
43 #include <sys/mutex.h>
44 #include <sys/kernel.h>
45 #include <sys/socket.h>
46 #include <sys/sockio.h>
47 #include <sys/errno.h>
48 #include <sys/callout.h>
49 #include <sys/bus.h>
50 #include <sys/endian.h>
51 #include <sys/kthread.h>
52 #include <sys/taskqueue.h>
53 #include <sys/priv.h>
54
55 #include <machine/bus.h>
56
57 #include <net/if.h>
58 #include <net/if_dl.h>
59 #include <net/if_media.h>
60 #include <net/if_types.h>
61 #include <net/if_arp.h>
62 #include <net/ethernet.h>
63 #include <net/if_llc.h>
64
65 #include <net80211/ieee80211_var.h>
66 #include <net80211/ieee80211_regdomain.h>
67 #ifdef IEEE80211_SUPPORT_SUPERG
68 #include <net80211/ieee80211_superg.h>
69 #endif
70 #ifdef IEEE80211_SUPPORT_TDMA
71 #include <net80211/ieee80211_tdma.h>
72 #endif
73
74 #include <net/bpf.h>
75
76 #ifdef INET
77 #include <netinet/in.h>
78 #include <netinet/if_ether.h>
79 #endif
80
81 #include <dev/ath/if_athvar.h>
82 #include <dev/ath/ath_hal/ah_devid.h> /* XXX for softled */
83 #include <dev/ath/ath_hal/ah_diagcodes.h>
84
85 #ifdef ATH_TX99_DIAG
86 #include <dev/ath/ath_tx99/ath_tx99.h>
87 #endif
88
89 #include <dev/ath/if_ath_tx.h> /* XXX for some support functions */
90 #include <dev/ath/if_ath_tx_ht.h>
91 #include <dev/ath/if_athrate.h>
92 #include <dev/ath/if_ath_debug.h>
93
94 /*
95 * XXX net80211?
96 */
97 #define IEEE80211_AMPDU_SUBFRAME_DEFAULT 32
98
99 #define ATH_AGGR_DELIM_SZ 4 /* delimiter size */
100 #define ATH_AGGR_MINPLEN 256 /* in bytes, minimum packet length */
101 /* number of delimiters for encryption padding */
102 #define ATH_AGGR_ENCRYPTDELIM 10
103
104 /*
105 * returns delimiter padding required given the packet length
106 */
107 #define ATH_AGGR_GET_NDELIM(_len) \
108 (((((_len) + ATH_AGGR_DELIM_SZ) < ATH_AGGR_MINPLEN) ? \
109 (ATH_AGGR_MINPLEN - (_len) - ATH_AGGR_DELIM_SZ) : 0) >> 2)
110
111 #define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
112
113 int ath_max_4ms_framelen[4][32] = {
114 [MCS_HT20] = {
115 3212, 6432, 9648, 12864, 19300, 25736, 28952, 32172,
116 6424, 12852, 19280, 25708, 38568, 51424, 57852, 64280,
117 9628, 19260, 28896, 38528, 57792, 65532, 65532, 65532,
118 12828, 25656, 38488, 51320, 65532, 65532, 65532, 65532,
119 },
120 [MCS_HT20_SGI] = {
121 3572, 7144, 10720, 14296, 21444, 28596, 32172, 35744,
122 7140, 14284, 21428, 28568, 42856, 57144, 64288, 65532,
123 10700, 21408, 32112, 42816, 64228, 65532, 65532, 65532,
124 14256, 28516, 42780, 57040, 65532, 65532, 65532, 65532,
125 },
126 [MCS_HT40] = {
127 6680, 13360, 20044, 26724, 40092, 53456, 60140, 65532,
128 13348, 26700, 40052, 53400, 65532, 65532, 65532, 65532,
129 20004, 40008, 60016, 65532, 65532, 65532, 65532, 65532,
130 26644, 53292, 65532, 65532, 65532, 65532, 65532, 65532,
131 },
132 [MCS_HT40_SGI] = {
133 7420, 14844, 22272, 29696, 44544, 59396, 65532, 65532,
134 14832, 29668, 44504, 59340, 65532, 65532, 65532, 65532,
135 22232, 44464, 65532, 65532, 65532, 65532, 65532, 65532,
136 29616, 59232, 65532, 65532, 65532, 65532, 65532, 65532,
137 }
138 };
139
140 /*
141 * XXX should be in net80211
142 */
143 static int ieee80211_mpdudensity_map[] = {
144 0, /* IEEE80211_HTCAP_MPDUDENSITY_NA */
145 25, /* IEEE80211_HTCAP_MPDUDENSITY_025 */
146 50, /* IEEE80211_HTCAP_MPDUDENSITY_05 */
147 100, /* IEEE80211_HTCAP_MPDUDENSITY_1 */
148 200, /* IEEE80211_HTCAP_MPDUDENSITY_2 */
149 400, /* IEEE80211_HTCAP_MPDUDENSITY_4 */
150 800, /* IEEE80211_HTCAP_MPDUDENSITY_8 */
151 1600, /* IEEE80211_HTCAP_MPDUDENSITY_16 */
152 };
153
154 /*
155 * XXX should be in the HAL/net80211 ?
156 */
157 #define BITS_PER_BYTE 8
158 #define OFDM_PLCP_BITS 22
159 #define HT_RC_2_MCS(_rc) ((_rc) & 0x7f)
160 #define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1)
161 #define L_STF 8
162 #define L_LTF 8
163 #define L_SIG 4
164 #define HT_SIG 8
165 #define HT_STF 4
166 #define HT_LTF(_ns) (4 * (_ns))
167 #define SYMBOL_TIME(_ns) ((_ns) << 2) // ns * 4 us
168 #define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) // ns * 3.6 us
169 #define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
170 #define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
171 #define IS_HT_RATE(_rate) ((_rate) & 0x80)
172
173 const uint32_t bits_per_symbol[][2] = {
174 /* 20MHz 40MHz */
175 { 26, 54 }, // 0: BPSK
176 { 52, 108 }, // 1: QPSK 1/2
177 { 78, 162 }, // 2: QPSK 3/4
178 { 104, 216 }, // 3: 16-QAM 1/2
179 { 156, 324 }, // 4: 16-QAM 3/4
180 { 208, 432 }, // 5: 64-QAM 2/3
181 { 234, 486 }, // 6: 64-QAM 3/4
182 { 260, 540 }, // 7: 64-QAM 5/6
183 { 52, 108 }, // 8: BPSK
184 { 104, 216 }, // 9: QPSK 1/2
185 { 156, 324 }, // 10: QPSK 3/4
186 { 208, 432 }, // 11: 16-QAM 1/2
187 { 312, 648 }, // 12: 16-QAM 3/4
188 { 416, 864 }, // 13: 64-QAM 2/3
189 { 468, 972 }, // 14: 64-QAM 3/4
190 { 520, 1080 }, // 15: 64-QAM 5/6
191 { 78, 162 }, // 16: BPSK
192 { 156, 324 }, // 17: QPSK 1/2
193 { 234, 486 }, // 18: QPSK 3/4
194 { 312, 648 }, // 19: 16-QAM 1/2
195 { 468, 972 }, // 20: 16-QAM 3/4
196 { 624, 1296 }, // 21: 64-QAM 2/3
197 { 702, 1458 }, // 22: 64-QAM 3/4
198 { 780, 1620 }, // 23: 64-QAM 5/6
199 { 104, 216 }, // 24: BPSK
200 { 208, 432 }, // 25: QPSK 1/2
201 { 312, 648 }, // 26: QPSK 3/4
202 { 416, 864 }, // 27: 16-QAM 1/2
203 { 624, 1296 }, // 28: 16-QAM 3/4
204 { 832, 1728 }, // 29: 64-QAM 2/3
205 { 936, 1944 }, // 30: 64-QAM 3/4
206 { 1040, 2160 }, // 31: 64-QAM 5/6
207 };
208
209 /*
210 * Fill in the rate array information based on the current
211 * node configuration and the choices made by the rate
212 * selection code and ath_buf setup code.
213 *
214 * Later on, this may end up also being made by the
215 * rate control code, but for now it can live here.
216 *
217 * This needs to be called just before the packet is
218 * queued to the software queue or hardware queue,
219 * so all of the needed fields in bf_state are setup.
220 */
221 void
ath_tx_rate_fill_rcflags(struct ath_softc * sc,struct ath_buf * bf)222 ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf)
223 {
224 struct ieee80211_node *ni = bf->bf_node;
225 struct ieee80211com *ic = ni->ni_ic;
226 const HAL_RATE_TABLE *rt = sc->sc_currates;
227 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
228 uint8_t rate;
229 int i;
230
231 for (i = 0; i < ATH_RC_NUM; i++) {
232 rc[i].flags = 0;
233 if (rc[i].tries == 0)
234 continue;
235
236 rate = rt->info[rc[i].rix].rateCode;
237
238 /*
239 * Only enable short preamble for legacy rates
240 */
241 if ((! IS_HT_RATE(rate)) && bf->bf_state.bfs_shpream)
242 rate |= rt->info[rc[i].rix].shortPreamble;
243
244 /*
245 * Save this, used by the TX and completion code
246 */
247 rc[i].ratecode = rate;
248
249 if (bf->bf_state.bfs_txflags &
250 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
251 rc[i].flags |= ATH_RC_RTSCTS_FLAG;
252
253 /* Only enable shortgi, 2040, dual-stream if HT is set */
254 if (IS_HT_RATE(rate)) {
255 rc[i].flags |= ATH_RC_HT_FLAG;
256
257 if (ni->ni_chw == 40)
258 rc[i].flags |= ATH_RC_CW40_FLAG;
259
260 if (ni->ni_chw == 40 &&
261 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 &&
262 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40)
263 rc[i].flags |= ATH_RC_SGI_FLAG;
264
265 if (ni->ni_chw == 20 &&
266 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 &&
267 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20)
268 rc[i].flags |= ATH_RC_SGI_FLAG;
269
270 /*
271 * If we have STBC TX enabled and the receiver
272 * can receive (at least) 1 stream STBC, AND it's
273 * MCS 0-7, AND we have at least two chains enabled,
274 * enable STBC.
275 */
276 if (ic->ic_htcaps & IEEE80211_HTCAP_TXSTBC &&
277 ni->ni_htcap & IEEE80211_HTCAP_RXSTBC_1STREAM &&
278 (sc->sc_cur_txchainmask > 1) &&
279 HT_RC_2_STREAMS(rate) == 1) {
280 rc[i].flags |= ATH_RC_STBC_FLAG;
281 }
282
283 /*
284 * XXX TODO: LDPC
285 */
286
287 /*
288 * Dual / Triple stream rate?
289 */
290 if (HT_RC_2_STREAMS(rate) == 2)
291 rc[i].flags |= ATH_RC_DS_FLAG;
292 else if (HT_RC_2_STREAMS(rate) == 3)
293 rc[i].flags |= ATH_RC_TS_FLAG;
294 }
295
296 /*
297 * Calculate the maximum TX power cap for the current
298 * node.
299 */
300 rc[i].tx_power_cap = ieee80211_get_node_txpower(ni);
301
302 /*
303 * Calculate the maximum 4ms frame length based
304 * on the MCS rate, SGI and channel width flags.
305 */
306 if ((rc[i].flags & ATH_RC_HT_FLAG) &&
307 (HT_RC_2_MCS(rate) < 32)) {
308 int j;
309 if (rc[i].flags & ATH_RC_CW40_FLAG) {
310 if (rc[i].flags & ATH_RC_SGI_FLAG)
311 j = MCS_HT40_SGI;
312 else
313 j = MCS_HT40;
314 } else {
315 if (rc[i].flags & ATH_RC_SGI_FLAG)
316 j = MCS_HT20_SGI;
317 else
318 j = MCS_HT20;
319 }
320 rc[i].max4msframelen =
321 ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)];
322 } else
323 rc[i].max4msframelen = 0;
324 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
325 "%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n",
326 __func__, i, rate, rc[i].flags, rc[i].max4msframelen);
327 }
328 }
329
330 /*
331 * Return the number of delimiters to be added to
332 * meet the minimum required mpdudensity.
333 *
334 * Caller should make sure that the rate is HT.
335 *
336 * TODO: is this delimiter calculation supposed to be the
337 * total frame length, the hdr length, the data length (including
338 * delimiters, padding, CRC, etc) or ?
339 *
340 * TODO: this should ensure that the rate control information
341 * HAS been setup for the first rate.
342 *
343 * TODO: ensure this is only called for MCS rates.
344 *
345 * TODO: enforce MCS < 31
346 */
347 static int
ath_compute_num_delims(struct ath_softc * sc,struct ath_buf * first_bf,uint16_t pktlen)348 ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf,
349 uint16_t pktlen)
350 {
351 const HAL_RATE_TABLE *rt = sc->sc_currates;
352 struct ieee80211_node *ni = first_bf->bf_node;
353 struct ieee80211vap *vap = ni->ni_vap;
354 int ndelim, mindelim = 0;
355 int mpdudensity; /* in 1/100'th of a microsecond */
356 uint8_t rc, rix, flags;
357 int width, half_gi;
358 uint32_t nsymbits, nsymbols;
359 uint16_t minlen;
360
361 /*
362 * vap->iv_ampdu_density is a value, rather than the actual
363 * density.
364 */
365 if (vap->iv_ampdu_density > IEEE80211_HTCAP_MPDUDENSITY_16)
366 mpdudensity = 1600; /* maximum density */
367 else
368 mpdudensity = ieee80211_mpdudensity_map[vap->iv_ampdu_density];
369
370 /* Select standard number of delimiters based on frame length */
371 ndelim = ATH_AGGR_GET_NDELIM(pktlen);
372
373 /*
374 * If encryption is enabled, add extra delimiters to let the
375 * crypto hardware catch up. This could be tuned per-MAC and
376 * per-rate, but for now we'll simply assume encryption is
377 * always enabled.
378 *
379 * Also note that the Atheros reference driver inserts two
380 * delimiters by default for pre-AR9380 peers. This will
381 * include "that" required delimiter.
382 */
383 ndelim += ATH_AGGR_ENCRYPTDELIM;
384
385 /*
386 * For AR9380, there's a minimum number of delimeters
387 * required when doing RTS.
388 *
389 * XXX TODO: this is only needed if (a) RTS/CTS is enabled, and
390 * XXX (b) this is the first sub-frame in the aggregate.
391 */
392 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR)
393 && ndelim < AH_FIRST_DESC_NDELIMS)
394 ndelim = AH_FIRST_DESC_NDELIMS;
395
396 /*
397 * If sc_delim_min_pad is non-zero, enforce it as the minimum
398 * pad delimiter count.
399 */
400 if (sc->sc_delim_min_pad != 0)
401 ndelim = MAX(ndelim, sc->sc_delim_min_pad);
402
403 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
404 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n",
405 __func__, pktlen, ndelim, mpdudensity);
406
407 /*
408 * If the MPDU density is 0, we can return here.
409 * Otherwise, we need to convert the desired mpdudensity
410 * into a byte length, based on the rate in the subframe.
411 */
412 if (mpdudensity == 0)
413 return ndelim;
414
415 /*
416 * Convert desired mpdu density from microeconds to bytes based
417 * on highest rate in rate series (i.e. first rate) to determine
418 * required minimum length for subframe. Take into account
419 * whether high rate is 20 or 40Mhz and half or full GI.
420 */
421 rix = first_bf->bf_state.bfs_rc[0].rix;
422 rc = rt->info[rix].rateCode;
423 flags = first_bf->bf_state.bfs_rc[0].flags;
424 width = !! (flags & ATH_RC_CW40_FLAG);
425 half_gi = !! (flags & ATH_RC_SGI_FLAG);
426
427 /*
428 * mpdudensity is in 1/100th of a usec, so divide by 100
429 */
430 if (half_gi)
431 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity);
432 else
433 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity);
434 nsymbols /= 100;
435
436 if (nsymbols == 0)
437 nsymbols = 1;
438
439 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
440 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
441
442 /*
443 * Min length is the minimum frame length for the
444 * required MPDU density.
445 */
446 if (pktlen < minlen) {
447 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ;
448 ndelim = MAX(mindelim, ndelim);
449 }
450
451 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
452 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n",
453 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim);
454
455 return ndelim;
456 }
457
458 /*
459 * Fetch the aggregation limit.
460 *
461 * It's the lowest of the four rate series 4ms frame length.
462 */
463 static int
ath_get_aggr_limit(struct ath_softc * sc,struct ath_buf * bf)464 ath_get_aggr_limit(struct ath_softc *sc, struct ath_buf *bf)
465 {
466 int amin = ATH_AGGR_MAXSIZE;
467 int i;
468
469 if (sc->sc_aggr_limit > 0 && sc->sc_aggr_limit < ATH_AGGR_MAXSIZE)
470 amin = sc->sc_aggr_limit;
471
472 for (i = 0; i < ATH_RC_NUM; i++) {
473 if (bf->bf_state.bfs_rc[i].tries == 0)
474 continue;
475 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen);
476 }
477
478 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n",
479 __func__, amin);
480
481 return amin;
482 }
483
484 /*
485 * Setup a 11n rate series structure
486 *
487 * This should be called for both legacy and MCS rates.
488 *
489 * This uses the rate series stuf from ath_tx_rate_fill_rcflags().
490 *
491 * It, along with ath_buf_set_rate, must be called -after- a burst
492 * or aggregate is setup.
493 */
494 static void
ath_rateseries_setup(struct ath_softc * sc,struct ieee80211_node * ni,struct ath_buf * bf,HAL_11N_RATE_SERIES * series)495 ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni,
496 struct ath_buf *bf, HAL_11N_RATE_SERIES *series)
497 {
498 struct ieee80211com *ic = ni->ni_ic;
499 struct ath_hal *ah = sc->sc_ah;
500 HAL_BOOL shortPreamble = AH_FALSE;
501 const HAL_RATE_TABLE *rt = sc->sc_currates;
502 int i;
503 int pktlen;
504 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
505
506 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
507 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
508 shortPreamble = AH_TRUE;
509
510 /*
511 * If this is the first frame in an aggregate series,
512 * use the aggregate length.
513 */
514 if (bf->bf_state.bfs_aggr)
515 pktlen = bf->bf_state.bfs_al;
516 else
517 pktlen = bf->bf_state.bfs_pktlen;
518
519 /*
520 * XXX TODO: modify this routine to use the bfs_rc[x].flags
521 * XXX fields.
522 */
523 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4);
524 for (i = 0; i < ATH_RC_NUM; i++) {
525 /* Only set flags for actual TX attempts */
526 if (rc[i].tries == 0)
527 continue;
528
529 series[i].Tries = rc[i].tries;
530
531 /*
532 * XXX TODO: When the NIC is capable of three stream TX,
533 * transmit 1/2 stream rates on two streams.
534 *
535 * This reduces the power consumption of the NIC and
536 * keeps it within the PCIe slot power limits.
537 */
538 series[i].ChSel = sc->sc_cur_txchainmask;
539
540 /*
541 * Setup rate and TX power cap for this series.
542 */
543 series[i].Rate = rt->info[rc[i].rix].rateCode;
544 series[i].RateIndex = rc[i].rix;
545 series[i].tx_power_cap = rc[i].tx_power_cap;
546
547 /*
548 * Enable RTS/CTS as appropriate.
549 */
550 if (rc[i].flags & ATH_RC_RTSCTS_FLAG)
551 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS;
552
553 /*
554 * 11n rate? Update 11n flags.
555 */
556 if (rc[i].flags & ATH_RC_HT_FLAG) {
557 if (rc[i].flags & ATH_RC_CW40_FLAG)
558 series[i].RateFlags |= HAL_RATESERIES_2040;
559
560 if (rc[i].flags & ATH_RC_SGI_FLAG)
561 series[i].RateFlags |= HAL_RATESERIES_HALFGI;
562
563 if (rc[i].flags & ATH_RC_STBC_FLAG)
564 series[i].RateFlags |= HAL_RATESERIES_STBC;
565 }
566
567 /*
568 * PktDuration doesn't include slot, ACK, RTS, etc timing -
569 * it's just the packet duration
570 */
571 if (rc[i].flags & ATH_RC_HT_FLAG) {
572 series[i].PktDuration =
573 ath_computedur_ht(pktlen
574 , series[i].Rate
575 , HT_RC_2_STREAMS(series[i].Rate)
576 , series[i].RateFlags & HAL_RATESERIES_2040
577 , series[i].RateFlags & HAL_RATESERIES_HALFGI);
578 } else {
579 if (shortPreamble)
580 series[i].Rate |=
581 rt->info[rc[i].rix].shortPreamble;
582 series[i].PktDuration = ath_hal_computetxtime(ah,
583 rt, pktlen, rc[i].rix, shortPreamble);
584 }
585 }
586 }
587
588 #if 0
589 static void
590 ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series)
591 {
592 int i;
593 for (i = 0; i < ATH_RC_NUM; i++) {
594 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; "
595 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n",
596 i,
597 series[i].Rate,
598 series[i].Tries,
599 series[i].PktDuration,
600 series[i].ChSel,
601 series[i].tx_power_cap,
602 series[i].RateFlags);
603 }
604 }
605 #endif
606
607 /*
608 * Setup the 11n rate scenario and burst duration for the given TX descriptor
609 * list.
610 *
611 * This isn't useful for sending beacon frames, which has different needs
612 * wrt what's passed into the rate scenario function.
613 */
614 void
ath_buf_set_rate(struct ath_softc * sc,struct ieee80211_node * ni,struct ath_buf * bf)615 ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni,
616 struct ath_buf *bf)
617 {
618 HAL_11N_RATE_SERIES series[4];
619 struct ath_desc *ds = bf->bf_desc;
620 struct ath_hal *ah = sc->sc_ah;
621 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL);
622 int ctsrate = bf->bf_state.bfs_ctsrate;
623 int flags = bf->bf_state.bfs_txflags;
624
625 /* Setup rate scenario */
626 memset(&series, 0, sizeof(series));
627
628 ath_rateseries_setup(sc, ni, bf, series);
629
630 #if 0
631 ath_rateseries_print(sc, series);
632 #endif
633
634 /* Set rate scenario */
635 /*
636 * Note: Don't allow hardware to override the duration on
637 * ps-poll packets.
638 */
639 ath_hal_set11nratescenario(ah, ds,
640 !is_pspoll, /* whether to override the duration or not */
641 ctsrate, /* rts/cts rate */
642 series, /* 11n rate series */
643 4, /* number of series */
644 flags);
645
646 /* Set burst duration */
647 /*
648 * This is only required when doing 11n burst, not aggregation
649 * ie, if there's a second frame in a RIFS or A-MPDU burst
650 * w/ >1 A-MPDU frame bursting back to back.
651 * Normal A-MPDU doesn't do bursting -between- aggregates.
652 *
653 * .. and it's highly likely this won't ever be implemented
654 */
655 //ath_hal_set11nburstduration(ah, ds, 8192);
656 }
657
658 /*
659 * Form an aggregate packet list.
660 *
661 * This function enforces the aggregate restrictions/requirements.
662 *
663 * These are:
664 *
665 * + The aggregate size maximum (64k for AR9160 and later, 8K for
666 * AR5416 when doing RTS frame protection.)
667 * + Maximum number of sub-frames for an aggregate
668 * + The aggregate delimiter size, giving MACs time to do whatever is
669 * needed before each frame
670 * + Enforce the BAW limit
671 *
672 * Each descriptor queued should have the DMA setup.
673 * The rate series, descriptor setup, linking, etc is all done
674 * externally. This routine simply chains them together.
675 * ath_tx_setds_11n() will take care of configuring the per-
676 * descriptor setup, and ath_buf_set_rate() will configure the
677 * rate control.
678 *
679 * The TID lock is required for the entirety of this function.
680 *
681 * If some code in another thread adds to the head of this
682 * list, very strange behaviour will occur. Since retransmission is the
683 * only reason this will occur, and this routine is designed to be called
684 * from within the scheduler task, it won't ever clash with the completion
685 * task.
686 *
687 * So if you want to call this from an upper layer context (eg, to direct-
688 * dispatch aggregate frames to the hardware), please keep this in mind.
689 */
690 ATH_AGGR_STATUS
ath_tx_form_aggr(struct ath_softc * sc,struct ath_node * an,struct ath_tid * tid,ath_bufhead * bf_q)691 ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an,
692 struct ath_tid *tid, ath_bufhead *bf_q)
693 {
694 //struct ieee80211_node *ni = &an->an_node;
695 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL;
696 int nframes = 0;
697 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw;
698 struct ieee80211_tx_ampdu *tap;
699 int status = ATH_AGGR_DONE;
700 int prev_frames = 0; /* XXX for AR5416 burst, not done here */
701 int prev_al = 0; /* XXX also for AR5416 burst */
702
703 ATH_TX_LOCK_ASSERT(sc);
704
705 tap = ath_tx_get_tx_tid(an, tid->tid);
706 if (tap == NULL) {
707 status = ATH_AGGR_ERROR;
708 goto finish;
709 }
710
711 h_baw = tap->txa_wnd / 2;
712
713 for (;;) {
714 bf = ATH_TID_FIRST(tid);
715 if (bf_first == NULL)
716 bf_first = bf;
717 if (bf == NULL) {
718 status = ATH_AGGR_DONE;
719 break;
720 } else {
721 /*
722 * It's the first frame;
723 * set the aggregation limit based on the
724 * rate control decision that has been made.
725 */
726 aggr_limit = ath_get_aggr_limit(sc, bf_first);
727 }
728
729 /* Set this early just so things don't get confused */
730 bf->bf_next = NULL;
731
732 /*
733 * If the frame doesn't have a sequence number that we're
734 * tracking in the BAW (eg NULL QOS data frame), we can't
735 * aggregate it. Stop the aggregation process; the sender
736 * can then TX what's in the list thus far and then
737 * TX the frame individually.
738 */
739 if (! bf->bf_state.bfs_dobaw) {
740 status = ATH_AGGR_NONAGGR;
741 break;
742 }
743
744 /*
745 * If any of the rates are non-HT, this packet
746 * can't be aggregated.
747 * XXX TODO: add a bf_state flag which gets marked
748 * if any active rate is non-HT.
749 */
750
751 /*
752 * do not exceed aggregation limit
753 */
754 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen;
755 if (nframes &&
756 (aggr_limit < (al + bpad + al_delta + prev_al))) {
757 status = ATH_AGGR_LIMITED;
758 break;
759 }
760
761 /*
762 * If RTS/CTS is set on the first frame, enforce
763 * the RTS aggregate limit.
764 */
765 if (bf_first->bf_state.bfs_txflags &
766 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) {
767 if (nframes &&
768 (sc->sc_rts_aggr_limit <
769 (al + bpad + al_delta + prev_al))) {
770 status = ATH_AGGR_8K_LIMITED;
771 break;
772 }
773 }
774
775 /*
776 * Do not exceed subframe limit.
777 */
778 if ((nframes + prev_frames) >= MIN((h_baw),
779 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) {
780 status = ATH_AGGR_LIMITED;
781 break;
782 }
783
784 /*
785 * If the current frame has an RTS/CTS configuration
786 * that differs from the first frame, override the
787 * subsequent frame with this config.
788 */
789 if (bf != bf_first) {
790 bf->bf_state.bfs_txflags &=
791 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
792 bf->bf_state.bfs_txflags |=
793 bf_first->bf_state.bfs_txflags &
794 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
795 }
796
797 /*
798 * If the packet has a sequence number, do not
799 * step outside of the block-ack window.
800 */
801 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
802 SEQNO(bf->bf_state.bfs_seqno))) {
803 status = ATH_AGGR_BAW_CLOSED;
804 break;
805 }
806
807 /*
808 * this packet is part of an aggregate.
809 */
810 ATH_TID_REMOVE(tid, bf, bf_list);
811
812 /* The TID lock is required for the BAW update */
813 ath_tx_addto_baw(sc, an, tid, bf);
814 bf->bf_state.bfs_addedbaw = 1;
815
816 /*
817 * XXX enforce ACK for aggregate frames (this needs to be
818 * XXX handled more gracefully?
819 */
820 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
821 device_printf(sc->sc_dev,
822 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n",
823 __func__);
824 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK);
825 }
826
827 /*
828 * Add the now owned buffer (which isn't
829 * on the software TXQ any longer) to our
830 * aggregate frame list.
831 */
832 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
833 nframes ++;
834
835 /* Completion handler */
836 bf->bf_comp = ath_tx_aggr_comp;
837
838 /*
839 * add padding for previous frame to aggregation length
840 */
841 al += bpad + al_delta;
842
843 /*
844 * Calculate delimiters needed for the current frame
845 */
846 bf->bf_state.bfs_ndelim =
847 ath_compute_num_delims(sc, bf_first,
848 bf->bf_state.bfs_pktlen);
849
850 /*
851 * Calculate the padding needed from this set of delimiters,
852 * used when calculating if the next frame will fit in
853 * the aggregate.
854 */
855 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2);
856
857 /*
858 * Chain the buffers together
859 */
860 if (bf_prev)
861 bf_prev->bf_next = bf;
862 bf_prev = bf;
863
864 /*
865 * If we're leaking frames, just return at this point;
866 * we've queued a single frame and we don't want to add
867 * any more.
868 */
869 if (tid->an->an_leak_count) {
870 status = ATH_AGGR_LEAK_CLOSED;
871 break;
872 }
873
874 #if 0
875 /*
876 * terminate aggregation on a small packet boundary
877 */
878 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) {
879 status = ATH_AGGR_SHORTPKT;
880 break;
881 }
882 #endif
883
884 }
885
886 finish:
887 /*
888 * Just in case the list was empty when we tried to
889 * dequeue a packet ..
890 */
891 if (bf_first) {
892 bf_first->bf_state.bfs_al = al;
893 bf_first->bf_state.bfs_nframes = nframes;
894 }
895 return status;
896 }
897