2 * Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/sysctl.h>
41 #include <sys/malloc.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>
50 #include <sys/endian.h>
51 #include <sys/kthread.h>
52 #include <sys/taskqueue.h>
55 #include <machine/bus.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>
65 #include <net80211/ieee80211_var.h>
66 #include <net80211/ieee80211_regdomain.h>
67 #ifdef IEEE80211_SUPPORT_SUPERG
68 #include <net80211/ieee80211_superg.h>
70 #ifdef IEEE80211_SUPPORT_TDMA
71 #include <net80211/ieee80211_tdma.h>
77 #include <netinet/in.h>
78 #include <netinet/if_ether.h>
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>
86 #include <dev/ath/ath_tx99/ath_tx99.h>
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>
97 #define IEEE80211_AMPDU_SUBFRAME_DEFAULT 32
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
105 * returns delimiter padding required given the packet length
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)
111 #define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
113 int ath_max_4ms_framelen[4][32] = {
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,
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,
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,
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,
141 * XXX should be in net80211
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 */
155 * XXX should be in the HAL/net80211 ?
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)
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)
173 const uint32_t bits_per_symbol[][2] = {
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
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.
214 * Later on, this may end up also being made by the
215 * rate control code, but for now it can live here.
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.
222 ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf)
224 struct ieee80211_node *ni = bf->bf_node;
225 struct ieee80211vap *vap = ni->ni_vap;
226 struct ieee80211com *ic = ni->ni_ic;
227 const HAL_RATE_TABLE *rt = sc->sc_currates;
228 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
235 * We only do LDPC if the rate is 11n, both we and the
236 * receiver support LDPC and it's enabled.
238 * It's a global flag, not a per-try flag, so we clear
239 * it if any of the rate entries aren't 11n.
242 if ((ni->ni_vap->iv_htcaps & IEEE80211_HTCAP_LDPC) &&
243 (ni->ni_htcap & IEEE80211_HTCAP_LDPC))
247 * The 11n duration calculation doesn't know about LDPC,
248 * so don't enable it for positioning.
250 if (bf->bf_flags & ATH_BUF_TOA_PROBE)
255 for (i = 0; i < ATH_RC_NUM; i++) {
257 if (rc[i].tries == 0)
260 rate = rt->info[rc[i].rix].rateCode;
263 * Only enable short preamble for legacy rates
265 if ((! IS_HT_RATE(rate)) && bf->bf_state.bfs_shpream)
266 rate |= rt->info[rc[i].rix].shortPreamble;
269 * Save this, used by the TX and completion code
271 rc[i].ratecode = rate;
273 if (bf->bf_state.bfs_txflags &
274 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
275 rc[i].flags |= ATH_RC_RTSCTS_FLAG;
278 * If we can't do LDPC, don't.
280 if (! IS_HT_RATE(rate))
283 /* Only enable shortgi, 2040, dual-stream if HT is set */
284 if (IS_HT_RATE(rate)) {
285 rc[i].flags |= ATH_RC_HT_FLAG;
287 if (ni->ni_chw == 40)
288 rc[i].flags |= ATH_RC_CW40_FLAG;
291 * NOTE: Don't do short-gi for positioning frames.
293 * For now, the ath_hal and net80211 HT duration
294 * calculation rounds up the 11n data txtime
295 * to the nearest multiple of 3.6 microseconds
296 * and doesn't return the fractional part, so
297 * we are always "out" by some amount.
299 if (ni->ni_chw == 40 &&
300 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 &&
301 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40 &&
302 vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40 &&
303 (bf->bf_flags & ATH_BUF_TOA_PROBE) == 0) {
304 rc[i].flags |= ATH_RC_SGI_FLAG;
307 if (ni->ni_chw == 20 &&
308 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 &&
309 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20 &&
310 vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20 &&
311 (bf->bf_flags & ATH_BUF_TOA_PROBE) == 0) {
312 rc[i].flags |= ATH_RC_SGI_FLAG;
316 * If we have STBC TX enabled and the receiver
317 * can receive (at least) 1 stream STBC, AND it's
318 * MCS 0-7, AND we have at least two chains enabled,
319 * and we're not doing positioning, enable STBC.
321 if (ic->ic_htcaps & IEEE80211_HTCAP_TXSTBC &&
322 (ni->ni_vap->iv_flags_ht & IEEE80211_FHT_STBC_TX) &&
323 (ni->ni_htcap & IEEE80211_HTCAP_RXSTBC) &&
324 (sc->sc_cur_txchainmask > 1) &&
325 (HT_RC_2_STREAMS(rate) == 1) &&
326 (bf->bf_flags & ATH_BUF_TOA_PROBE) == 0) {
327 rc[i].flags |= ATH_RC_STBC_FLAG;
332 * Dual / Triple stream rate?
334 if (HT_RC_2_STREAMS(rate) == 2)
335 rc[i].flags |= ATH_RC_DS_FLAG;
336 else if (HT_RC_2_STREAMS(rate) == 3)
337 rc[i].flags |= ATH_RC_TS_FLAG;
341 * Calculate the maximum TX power cap for the current
344 rc[i].tx_power_cap = ieee80211_get_node_txpower(ni);
347 * Calculate the maximum 4ms frame length based
348 * on the MCS rate, SGI and channel width flags.
350 if ((rc[i].flags & ATH_RC_HT_FLAG) &&
351 (HT_RC_2_MCS(rate) < 32)) {
353 if (rc[i].flags & ATH_RC_CW40_FLAG) {
354 if (rc[i].flags & ATH_RC_SGI_FLAG)
359 if (rc[i].flags & ATH_RC_SGI_FLAG)
364 rc[i].max4msframelen =
365 ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)];
367 rc[i].max4msframelen = 0;
368 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
369 "%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n",
370 __func__, i, rate, rc[i].flags, rc[i].max4msframelen);
374 * LDPC is a global flag, so ...
377 bf->bf_state.bfs_txflags |= HAL_TXDESC_LDPC;
378 sc->sc_stats.ast_tx_ldpc++;
382 sc->sc_stats.ast_tx_stbc++;
387 * Return the number of delimiters to be added to
388 * meet the minimum required mpdudensity.
390 * Caller should make sure that the rate is HT.
392 * TODO: is this delimiter calculation supposed to be the
393 * total frame length, the hdr length, the data length (including
394 * delimiters, padding, CRC, etc) or ?
396 * TODO: this should ensure that the rate control information
397 * HAS been setup for the first rate.
399 * TODO: ensure this is only called for MCS rates.
401 * TODO: enforce MCS < 31
404 ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf,
407 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
408 const HAL_RATE_TABLE *rt = sc->sc_currates;
409 struct ieee80211_node *ni = first_bf->bf_node;
410 struct ieee80211vap *vap = ni->ni_vap;
411 int ndelim, mindelim = 0;
412 int mpdudensity; /* in 1/100'th of a microsecond */
413 int peer_mpdudensity; /* net80211 value */
414 uint8_t rc, rix, flags;
416 uint32_t nsymbits, nsymbols;
420 * Get the advertised density from the node.
422 peer_mpdudensity = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
425 * vap->iv_ampdu_density is a net80211 value, rather than the actual
426 * density. Larger values are longer A-MPDU density spacing values,
427 * and we want to obey larger configured / negotiated density values
428 * per station if we get it.
430 if (vap->iv_ampdu_density > peer_mpdudensity)
431 peer_mpdudensity = vap->iv_ampdu_density;
434 * Convert the A-MPDU density net80211 value to a 1/100 microsecond
435 * value for subsequent calculations.
437 if (peer_mpdudensity > IEEE80211_HTCAP_MPDUDENSITY_16)
438 mpdudensity = 1600; /* maximum density */
440 mpdudensity = ieee80211_mpdudensity_map[peer_mpdudensity];
442 /* Select standard number of delimiters based on frame length */
443 ndelim = ATH_AGGR_GET_NDELIM(pktlen);
446 * If encryption is enabled, add extra delimiters to let the
447 * crypto hardware catch up. This could be tuned per-MAC and
448 * per-rate, but for now we'll simply assume encryption is
451 * Also note that the Atheros reference driver inserts two
452 * delimiters by default for pre-AR9380 peers. This will
453 * include "that" required delimiter.
455 ndelim += ATH_AGGR_ENCRYPTDELIM;
458 * For AR9380, there's a minimum number of delimeters
459 * required when doing RTS.
461 * XXX TODO: this is only needed if (a) RTS/CTS is enabled, and
462 * XXX (b) this is the first sub-frame in the aggregate.
464 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR)
465 && ndelim < AH_FIRST_DESC_NDELIMS)
466 ndelim = AH_FIRST_DESC_NDELIMS;
469 * If sc_delim_min_pad is non-zero, enforce it as the minimum
470 * pad delimiter count.
472 if (sc->sc_delim_min_pad != 0)
473 ndelim = MAX(ndelim, sc->sc_delim_min_pad);
475 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
476 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n",
477 __func__, pktlen, ndelim, mpdudensity);
480 * If the MPDU density is 0, we can return here.
481 * Otherwise, we need to convert the desired mpdudensity
482 * into a byte length, based on the rate in the subframe.
484 if (mpdudensity == 0)
488 * Convert desired mpdu density from microeconds to bytes based
489 * on highest rate in rate series (i.e. first rate) to determine
490 * required minimum length for subframe. Take into account
491 * whether high rate is 20 or 40Mhz and half or full GI.
493 rix = first_bf->bf_state.bfs_rc[0].rix;
494 rc = rt->info[rix].rateCode;
495 flags = first_bf->bf_state.bfs_rc[0].flags;
496 width = !! (flags & ATH_RC_CW40_FLAG);
497 half_gi = !! (flags & ATH_RC_SGI_FLAG);
500 * mpdudensity is in 1/100th of a usec, so divide by 100
503 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity);
505 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity);
511 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
512 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
515 * Min length is the minimum frame length for the
516 * required MPDU density.
518 if (pktlen < minlen) {
519 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ;
520 ndelim = MAX(mindelim, ndelim);
523 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
524 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n",
525 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim);
532 * Fetch the aggregation limit.
534 * It's the lowest of the four rate series 4ms frame length.
536 * Also take into account the hardware specific limits (8KiB on AR5416)
537 * and per-peer limits in non-STA mode.
540 ath_get_aggr_limit(struct ath_softc *sc, struct ieee80211_node *ni,
543 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
544 int amin = ATH_AGGR_MAXSIZE;
547 /* Extract out the maximum configured driver A-MPDU limit */
548 if (sc->sc_aggr_limit > 0 && sc->sc_aggr_limit < ATH_AGGR_MAXSIZE)
549 amin = sc->sc_aggr_limit;
552 * Check the HTCAP field for the maximum size the node has
553 * negotiated. If it's smaller than what we have, cap it there.
555 switch (MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU)) {
556 case IEEE80211_HTCAP_MAXRXAMPDU_16K:
557 amin = MIN(amin, 16384);
559 case IEEE80211_HTCAP_MAXRXAMPDU_32K:
560 amin = MIN(amin, 32768);
562 case IEEE80211_HTCAP_MAXRXAMPDU_64K:
563 amin = MIN(amin, 65536);
565 case IEEE80211_HTCAP_MAXRXAMPDU_8K:
567 amin = MIN(amin, 8192);
571 for (i = 0; i < ATH_RC_NUM; i++) {
572 if (bf->bf_state.bfs_rc[i].tries == 0)
574 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen);
577 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n",
585 * Setup a 11n rate series structure
587 * This should be called for both legacy and MCS rates.
589 * This uses the rate series stuf from ath_tx_rate_fill_rcflags().
591 * It, along with ath_buf_set_rate, must be called -after- a burst
592 * or aggregate is setup.
595 ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni,
596 struct ath_buf *bf, HAL_11N_RATE_SERIES *series)
598 struct ieee80211com *ic = ni->ni_ic;
599 struct ath_hal *ah = sc->sc_ah;
600 HAL_BOOL shortPreamble = AH_FALSE;
601 const HAL_RATE_TABLE *rt = sc->sc_currates;
604 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
606 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
607 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
608 shortPreamble = AH_TRUE;
611 * If this is the first frame in an aggregate series,
612 * use the aggregate length.
614 if (bf->bf_state.bfs_aggr)
615 pktlen = bf->bf_state.bfs_al;
617 pktlen = bf->bf_state.bfs_pktlen;
620 * XXX TODO: modify this routine to use the bfs_rc[x].flags
623 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4);
624 for (i = 0; i < ATH_RC_NUM; i++) {
625 /* Only set flags for actual TX attempts */
626 if (rc[i].tries == 0)
629 series[i].Tries = rc[i].tries;
632 * XXX TODO: When the NIC is capable of three stream TX,
633 * transmit 1/2 stream rates on two streams.
635 * This reduces the power consumption of the NIC and
636 * keeps it within the PCIe slot power limits.
638 series[i].ChSel = sc->sc_cur_txchainmask;
641 * Setup rate and TX power cap for this series.
643 series[i].Rate = rt->info[rc[i].rix].rateCode;
644 series[i].RateIndex = rc[i].rix;
645 series[i].tx_power_cap = rc[i].tx_power_cap;
648 * Enable RTS/CTS as appropriate.
650 if (rc[i].flags & ATH_RC_RTSCTS_FLAG)
651 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS;
654 * 11n rate? Update 11n flags.
656 if (rc[i].flags & ATH_RC_HT_FLAG) {
657 if (rc[i].flags & ATH_RC_CW40_FLAG)
658 series[i].RateFlags |= HAL_RATESERIES_2040;
660 if (rc[i].flags & ATH_RC_SGI_FLAG)
661 series[i].RateFlags |= HAL_RATESERIES_HALFGI;
663 if (rc[i].flags & ATH_RC_STBC_FLAG)
664 series[i].RateFlags |= HAL_RATESERIES_STBC;
668 * TODO: If we're all doing 11n rates then we can set LDPC.
669 * If we've been asked to /do/ LDPC but we are handed a
670 * legacy rate, then we should complain. Loudly.
674 * PktDuration doesn't include slot, ACK, RTS, etc timing -
675 * it's just the packet duration
677 if (rc[i].flags & ATH_RC_HT_FLAG) {
678 series[i].PktDuration =
679 ath_computedur_ht(pktlen
681 , HT_RC_2_STREAMS(series[i].Rate)
682 , series[i].RateFlags & HAL_RATESERIES_2040
683 , series[i].RateFlags & HAL_RATESERIES_HALFGI);
687 rt->info[rc[i].rix].shortPreamble;
688 /* XXX TODO: don't include SIFS */
689 series[i].PktDuration = ath_hal_computetxtime(ah,
690 rt, pktlen, rc[i].rix, shortPreamble, AH_TRUE);
697 ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series)
700 for (i = 0; i < ATH_RC_NUM; i++) {
701 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; "
702 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n",
706 series[i].PktDuration,
708 series[i].tx_power_cap,
709 series[i].RateFlags);
715 * Setup the 11n rate scenario and burst duration for the given TX descriptor
718 * This isn't useful for sending beacon frames, which has different needs
719 * wrt what's passed into the rate scenario function.
722 ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni,
725 HAL_11N_RATE_SERIES series[4];
726 struct ath_desc *ds = bf->bf_desc;
727 struct ath_hal *ah = sc->sc_ah;
728 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL);
729 int ctsrate = bf->bf_state.bfs_ctsrate;
730 int flags = bf->bf_state.bfs_txflags;
732 /* Setup rate scenario */
733 memset(&series, 0, sizeof(series));
735 ath_rateseries_setup(sc, ni, bf, series);
738 if (sc->sc_debug & ATH_DEBUG_XMIT)
739 ath_rateseries_print(sc, series);
742 /* Set rate scenario */
744 * Note: Don't allow hardware to override the duration on
747 ath_hal_set11nratescenario(ah, ds,
748 !is_pspoll, /* whether to override the duration or not */
749 ctsrate, /* rts/cts rate */
750 series, /* 11n rate series */
751 4, /* number of series */
754 /* Set burst duration */
756 * This is only required when doing 11n burst, not aggregation
757 * ie, if there's a second frame in a RIFS or A-MPDU burst
758 * w/ >1 A-MPDU frame bursting back to back.
759 * Normal A-MPDU doesn't do bursting -between- aggregates.
761 * .. and it's highly likely this won't ever be implemented
763 //ath_hal_set11nburstduration(ah, ds, 8192);
767 * Form an aggregate packet list.
769 * This function enforces the aggregate restrictions/requirements.
773 * + The aggregate size maximum (64k for AR9160 and later, 8K for
774 * AR5416 when doing RTS frame protection.)
775 * + Maximum number of sub-frames for an aggregate
776 * + The aggregate delimiter size, giving MACs time to do whatever is
777 * needed before each frame
778 * + Enforce the BAW limit
780 * Each descriptor queued should have the DMA setup.
781 * The rate series, descriptor setup, linking, etc is all done
782 * externally. This routine simply chains them together.
783 * ath_tx_setds_11n() will take care of configuring the per-
784 * descriptor setup, and ath_buf_set_rate() will configure the
787 * The TID lock is required for the entirety of this function.
789 * If some code in another thread adds to the head of this
790 * list, very strange behaviour will occur. Since retransmission is the
791 * only reason this will occur, and this routine is designed to be called
792 * from within the scheduler task, it won't ever clash with the completion
795 * So if you want to call this from an upper layer context (eg, to direct-
796 * dispatch aggregate frames to the hardware), please keep this in mind.
799 ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an,
800 struct ath_tid *tid, ath_bufhead *bf_q)
802 //struct ieee80211_node *ni = &an->an_node;
803 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL;
805 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw;
806 struct ieee80211_tx_ampdu *tap;
807 int status = ATH_AGGR_DONE;
808 int prev_frames = 0; /* XXX for AR5416 burst, not done here */
809 int prev_al = 0; /* XXX also for AR5416 burst */
811 ATH_TX_LOCK_ASSERT(sc);
813 tap = ath_tx_get_tx_tid(an, tid->tid);
815 status = ATH_AGGR_ERROR;
819 h_baw = tap->txa_wnd / 2;
822 bf = ATH_TID_FIRST(tid);
823 if (bf_first == NULL)
826 status = ATH_AGGR_DONE;
830 * It's the first frame;
831 * set the aggregation limit based on the
832 * rate control decision that has been made.
834 aggr_limit = ath_get_aggr_limit(sc, &an->an_node,
838 /* Set this early just so things don't get confused */
842 * If the frame doesn't have a sequence number that we're
843 * tracking in the BAW (eg NULL QOS data frame), we can't
844 * aggregate it. Stop the aggregation process; the sender
845 * can then TX what's in the list thus far and then
846 * TX the frame individually.
848 if (! bf->bf_state.bfs_dobaw) {
849 status = ATH_AGGR_NONAGGR;
854 * If any of the rates are non-HT, this packet
855 * can't be aggregated.
856 * XXX TODO: add a bf_state flag which gets marked
857 * if any active rate is non-HT.
861 * do not exceed aggregation limit
863 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen;
865 (aggr_limit < (al + bpad + al_delta + prev_al))) {
866 status = ATH_AGGR_LIMITED;
871 * If RTS/CTS is set on the first frame, enforce
872 * the RTS aggregate limit.
874 if (bf_first->bf_state.bfs_txflags &
875 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) {
877 (sc->sc_rts_aggr_limit <
878 (al + bpad + al_delta + prev_al))) {
879 status = ATH_AGGR_8K_LIMITED;
885 * Do not exceed subframe limit.
887 if ((nframes + prev_frames) >= MIN((h_baw),
888 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) {
889 status = ATH_AGGR_LIMITED;
894 * If the current frame has an RTS/CTS configuration
895 * that differs from the first frame, override the
896 * subsequent frame with this config.
898 if (bf != bf_first) {
899 bf->bf_state.bfs_txflags &=
900 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
901 bf->bf_state.bfs_txflags |=
902 bf_first->bf_state.bfs_txflags &
903 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
907 * If the packet has a sequence number, do not
908 * step outside of the block-ack window.
910 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
911 SEQNO(bf->bf_state.bfs_seqno))) {
912 status = ATH_AGGR_BAW_CLOSED;
917 * this packet is part of an aggregate.
919 ATH_TID_REMOVE(tid, bf, bf_list);
921 /* The TID lock is required for the BAW update */
922 ath_tx_addto_baw(sc, an, tid, bf);
923 bf->bf_state.bfs_addedbaw = 1;
926 * XXX enforce ACK for aggregate frames (this needs to be
927 * XXX handled more gracefully?
929 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
930 device_printf(sc->sc_dev,
931 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n",
933 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK);
937 * Add the now owned buffer (which isn't
938 * on the software TXQ any longer) to our
939 * aggregate frame list.
941 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
944 /* Completion handler */
945 bf->bf_comp = ath_tx_aggr_comp;
948 * add padding for previous frame to aggregation length
950 al += bpad + al_delta;
953 * Calculate delimiters needed for the current frame
955 bf->bf_state.bfs_ndelim =
956 ath_compute_num_delims(sc, bf_first,
957 bf->bf_state.bfs_pktlen);
960 * Calculate the padding needed from this set of delimiters,
961 * used when calculating if the next frame will fit in
964 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2);
967 * Chain the buffers together
970 bf_prev->bf_next = bf;
974 * If we're leaking frames, just return at this point;
975 * we've queued a single frame and we don't want to add
978 if (tid->an->an_leak_count) {
979 status = ATH_AGGR_LEAK_CLOSED;
985 * terminate aggregation on a small packet boundary
987 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) {
988 status = ATH_AGGR_SHORTPKT;
997 * Just in case the list was empty when we tried to
998 * dequeue a packet ..
1001 bf_first->bf_state.bfs_al = al;
1002 bf_first->bf_state.bfs_nframes = nframes;