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 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;
234 * We only do LDPC if the rate is 11n, both we and the
235 * receiver support LDPC and it's enabled.
237 * It's a global flag, not a per-try flag, so we clear
238 * it if any of the rate entries aren't 11n.
241 if ((ni->ni_vap->iv_htcaps & IEEE80211_HTCAP_LDPC) &&
242 (ni->ni_htcap & IEEE80211_HTCAP_LDPC))
246 for (i = 0; i < ATH_RC_NUM; i++) {
248 if (rc[i].tries == 0)
251 rate = rt->info[rc[i].rix].rateCode;
254 * Only enable short preamble for legacy rates
256 if ((! IS_HT_RATE(rate)) && bf->bf_state.bfs_shpream)
257 rate |= rt->info[rc[i].rix].shortPreamble;
260 * Save this, used by the TX and completion code
262 rc[i].ratecode = rate;
264 if (bf->bf_state.bfs_txflags &
265 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
266 rc[i].flags |= ATH_RC_RTSCTS_FLAG;
269 * If we can't do LDPC, don't.
271 if (! IS_HT_RATE(rate))
274 /* Only enable shortgi, 2040, dual-stream if HT is set */
275 if (IS_HT_RATE(rate)) {
276 rc[i].flags |= ATH_RC_HT_FLAG;
278 if (ni->ni_chw == 40)
279 rc[i].flags |= ATH_RC_CW40_FLAG;
281 if (ni->ni_chw == 40 &&
282 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 &&
283 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40)
284 rc[i].flags |= ATH_RC_SGI_FLAG;
286 if (ni->ni_chw == 20 &&
287 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 &&
288 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20)
289 rc[i].flags |= ATH_RC_SGI_FLAG;
292 * If we have STBC TX enabled and the receiver
293 * can receive (at least) 1 stream STBC, AND it's
294 * MCS 0-7, AND we have at least two chains enabled,
297 * XXX TODO: .. and the rate is an 11n rate?
299 if (ic->ic_htcaps & IEEE80211_HTCAP_TXSTBC &&
300 ni->ni_vap->iv_flags_ht & IEEE80211_FHT_STBC_TX &&
301 ni->ni_htcap & IEEE80211_HTCAP_RXSTBC_1STREAM &&
302 (sc->sc_cur_txchainmask > 1) &&
303 HT_RC_2_STREAMS(rate) == 1) {
304 rc[i].flags |= ATH_RC_STBC_FLAG;
309 * Dual / Triple stream rate?
311 if (HT_RC_2_STREAMS(rate) == 2)
312 rc[i].flags |= ATH_RC_DS_FLAG;
313 else if (HT_RC_2_STREAMS(rate) == 3)
314 rc[i].flags |= ATH_RC_TS_FLAG;
318 * Calculate the maximum TX power cap for the current
321 rc[i].tx_power_cap = ieee80211_get_node_txpower(ni);
324 * Calculate the maximum 4ms frame length based
325 * on the MCS rate, SGI and channel width flags.
327 if ((rc[i].flags & ATH_RC_HT_FLAG) &&
328 (HT_RC_2_MCS(rate) < 32)) {
330 if (rc[i].flags & ATH_RC_CW40_FLAG) {
331 if (rc[i].flags & ATH_RC_SGI_FLAG)
336 if (rc[i].flags & ATH_RC_SGI_FLAG)
341 rc[i].max4msframelen =
342 ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)];
344 rc[i].max4msframelen = 0;
345 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
346 "%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n",
347 __func__, i, rate, rc[i].flags, rc[i].max4msframelen);
351 * LDPC is a global flag, so ...
354 bf->bf_state.bfs_txflags |= HAL_TXDESC_LDPC;
355 sc->sc_stats.ast_tx_ldpc++;
359 sc->sc_stats.ast_tx_stbc++;
364 * Return the number of delimiters to be added to
365 * meet the minimum required mpdudensity.
367 * Caller should make sure that the rate is HT.
369 * TODO: is this delimiter calculation supposed to be the
370 * total frame length, the hdr length, the data length (including
371 * delimiters, padding, CRC, etc) or ?
373 * TODO: this should ensure that the rate control information
374 * HAS been setup for the first rate.
376 * TODO: ensure this is only called for MCS rates.
378 * TODO: enforce MCS < 31
381 ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf,
384 const HAL_RATE_TABLE *rt = sc->sc_currates;
385 struct ieee80211_node *ni = first_bf->bf_node;
386 struct ieee80211vap *vap = ni->ni_vap;
387 int ndelim, mindelim = 0;
388 int mpdudensity; /* in 1/100'th of a microsecond */
389 uint8_t rc, rix, flags;
391 uint32_t nsymbits, nsymbols;
395 * vap->iv_ampdu_density is a value, rather than the actual
398 if (vap->iv_ampdu_density > IEEE80211_HTCAP_MPDUDENSITY_16)
399 mpdudensity = 1600; /* maximum density */
401 mpdudensity = ieee80211_mpdudensity_map[vap->iv_ampdu_density];
403 /* Select standard number of delimiters based on frame length */
404 ndelim = ATH_AGGR_GET_NDELIM(pktlen);
407 * If encryption is enabled, add extra delimiters to let the
408 * crypto hardware catch up. This could be tuned per-MAC and
409 * per-rate, but for now we'll simply assume encryption is
412 * Also note that the Atheros reference driver inserts two
413 * delimiters by default for pre-AR9380 peers. This will
414 * include "that" required delimiter.
416 ndelim += ATH_AGGR_ENCRYPTDELIM;
419 * For AR9380, there's a minimum number of delimeters
420 * required when doing RTS.
422 * XXX TODO: this is only needed if (a) RTS/CTS is enabled, and
423 * XXX (b) this is the first sub-frame in the aggregate.
425 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR)
426 && ndelim < AH_FIRST_DESC_NDELIMS)
427 ndelim = AH_FIRST_DESC_NDELIMS;
430 * If sc_delim_min_pad is non-zero, enforce it as the minimum
431 * pad delimiter count.
433 if (sc->sc_delim_min_pad != 0)
434 ndelim = MAX(ndelim, sc->sc_delim_min_pad);
436 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
437 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n",
438 __func__, pktlen, ndelim, mpdudensity);
441 * If the MPDU density is 0, we can return here.
442 * Otherwise, we need to convert the desired mpdudensity
443 * into a byte length, based on the rate in the subframe.
445 if (mpdudensity == 0)
449 * Convert desired mpdu density from microeconds to bytes based
450 * on highest rate in rate series (i.e. first rate) to determine
451 * required minimum length for subframe. Take into account
452 * whether high rate is 20 or 40Mhz and half or full GI.
454 rix = first_bf->bf_state.bfs_rc[0].rix;
455 rc = rt->info[rix].rateCode;
456 flags = first_bf->bf_state.bfs_rc[0].flags;
457 width = !! (flags & ATH_RC_CW40_FLAG);
458 half_gi = !! (flags & ATH_RC_SGI_FLAG);
461 * mpdudensity is in 1/100th of a usec, so divide by 100
464 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity);
466 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity);
472 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
473 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
476 * Min length is the minimum frame length for the
477 * required MPDU density.
479 if (pktlen < minlen) {
480 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ;
481 ndelim = MAX(mindelim, ndelim);
484 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
485 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n",
486 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim);
492 * Fetch the aggregation limit.
494 * It's the lowest of the four rate series 4ms frame length.
497 ath_get_aggr_limit(struct ath_softc *sc, struct ath_buf *bf)
499 int amin = ATH_AGGR_MAXSIZE;
502 if (sc->sc_aggr_limit > 0 && sc->sc_aggr_limit < ATH_AGGR_MAXSIZE)
503 amin = sc->sc_aggr_limit;
505 for (i = 0; i < ATH_RC_NUM; i++) {
506 if (bf->bf_state.bfs_rc[i].tries == 0)
508 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen);
511 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n",
518 * Setup a 11n rate series structure
520 * This should be called for both legacy and MCS rates.
522 * This uses the rate series stuf from ath_tx_rate_fill_rcflags().
524 * It, along with ath_buf_set_rate, must be called -after- a burst
525 * or aggregate is setup.
528 ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni,
529 struct ath_buf *bf, HAL_11N_RATE_SERIES *series)
531 struct ieee80211com *ic = ni->ni_ic;
532 struct ath_hal *ah = sc->sc_ah;
533 HAL_BOOL shortPreamble = AH_FALSE;
534 const HAL_RATE_TABLE *rt = sc->sc_currates;
537 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
539 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
540 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
541 shortPreamble = AH_TRUE;
544 * If this is the first frame in an aggregate series,
545 * use the aggregate length.
547 if (bf->bf_state.bfs_aggr)
548 pktlen = bf->bf_state.bfs_al;
550 pktlen = bf->bf_state.bfs_pktlen;
553 * XXX TODO: modify this routine to use the bfs_rc[x].flags
556 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4);
557 for (i = 0; i < ATH_RC_NUM; i++) {
558 /* Only set flags for actual TX attempts */
559 if (rc[i].tries == 0)
562 series[i].Tries = rc[i].tries;
565 * XXX TODO: When the NIC is capable of three stream TX,
566 * transmit 1/2 stream rates on two streams.
568 * This reduces the power consumption of the NIC and
569 * keeps it within the PCIe slot power limits.
571 series[i].ChSel = sc->sc_cur_txchainmask;
574 * Setup rate and TX power cap for this series.
576 series[i].Rate = rt->info[rc[i].rix].rateCode;
577 series[i].RateIndex = rc[i].rix;
578 series[i].tx_power_cap = rc[i].tx_power_cap;
581 * Enable RTS/CTS as appropriate.
583 if (rc[i].flags & ATH_RC_RTSCTS_FLAG)
584 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS;
587 * 11n rate? Update 11n flags.
589 if (rc[i].flags & ATH_RC_HT_FLAG) {
590 if (rc[i].flags & ATH_RC_CW40_FLAG)
591 series[i].RateFlags |= HAL_RATESERIES_2040;
593 if (rc[i].flags & ATH_RC_SGI_FLAG)
594 series[i].RateFlags |= HAL_RATESERIES_HALFGI;
596 if (rc[i].flags & ATH_RC_STBC_FLAG)
597 series[i].RateFlags |= HAL_RATESERIES_STBC;
601 * TODO: If we're all doing 11n rates then we can set LDPC.
602 * If we've been asked to /do/ LDPC but we are handed a
603 * legacy rate, then we should complain. Loudly.
607 * PktDuration doesn't include slot, ACK, RTS, etc timing -
608 * it's just the packet duration
610 if (rc[i].flags & ATH_RC_HT_FLAG) {
611 series[i].PktDuration =
612 ath_computedur_ht(pktlen
614 , HT_RC_2_STREAMS(series[i].Rate)
615 , series[i].RateFlags & HAL_RATESERIES_2040
616 , series[i].RateFlags & HAL_RATESERIES_HALFGI);
620 rt->info[rc[i].rix].shortPreamble;
621 series[i].PktDuration = ath_hal_computetxtime(ah,
622 rt, pktlen, rc[i].rix, shortPreamble);
629 ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series)
632 for (i = 0; i < ATH_RC_NUM; i++) {
633 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; "
634 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n",
638 series[i].PktDuration,
640 series[i].tx_power_cap,
641 series[i].RateFlags);
647 * Setup the 11n rate scenario and burst duration for the given TX descriptor
650 * This isn't useful for sending beacon frames, which has different needs
651 * wrt what's passed into the rate scenario function.
654 ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni,
657 HAL_11N_RATE_SERIES series[4];
658 struct ath_desc *ds = bf->bf_desc;
659 struct ath_hal *ah = sc->sc_ah;
660 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL);
661 int ctsrate = bf->bf_state.bfs_ctsrate;
662 int flags = bf->bf_state.bfs_txflags;
664 /* Setup rate scenario */
665 memset(&series, 0, sizeof(series));
667 ath_rateseries_setup(sc, ni, bf, series);
670 if (sc->sc_debug & ATH_DEBUG_XMIT)
671 ath_rateseries_print(sc, series);
674 /* Set rate scenario */
676 * Note: Don't allow hardware to override the duration on
679 ath_hal_set11nratescenario(ah, ds,
680 !is_pspoll, /* whether to override the duration or not */
681 ctsrate, /* rts/cts rate */
682 series, /* 11n rate series */
683 4, /* number of series */
686 /* Set burst duration */
688 * This is only required when doing 11n burst, not aggregation
689 * ie, if there's a second frame in a RIFS or A-MPDU burst
690 * w/ >1 A-MPDU frame bursting back to back.
691 * Normal A-MPDU doesn't do bursting -between- aggregates.
693 * .. and it's highly likely this won't ever be implemented
695 //ath_hal_set11nburstduration(ah, ds, 8192);
699 * Form an aggregate packet list.
701 * This function enforces the aggregate restrictions/requirements.
705 * + The aggregate size maximum (64k for AR9160 and later, 8K for
706 * AR5416 when doing RTS frame protection.)
707 * + Maximum number of sub-frames for an aggregate
708 * + The aggregate delimiter size, giving MACs time to do whatever is
709 * needed before each frame
710 * + Enforce the BAW limit
712 * Each descriptor queued should have the DMA setup.
713 * The rate series, descriptor setup, linking, etc is all done
714 * externally. This routine simply chains them together.
715 * ath_tx_setds_11n() will take care of configuring the per-
716 * descriptor setup, and ath_buf_set_rate() will configure the
719 * The TID lock is required for the entirety of this function.
721 * If some code in another thread adds to the head of this
722 * list, very strange behaviour will occur. Since retransmission is the
723 * only reason this will occur, and this routine is designed to be called
724 * from within the scheduler task, it won't ever clash with the completion
727 * So if you want to call this from an upper layer context (eg, to direct-
728 * dispatch aggregate frames to the hardware), please keep this in mind.
731 ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an,
732 struct ath_tid *tid, ath_bufhead *bf_q)
734 //struct ieee80211_node *ni = &an->an_node;
735 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL;
737 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw;
738 struct ieee80211_tx_ampdu *tap;
739 int status = ATH_AGGR_DONE;
740 int prev_frames = 0; /* XXX for AR5416 burst, not done here */
741 int prev_al = 0; /* XXX also for AR5416 burst */
743 ATH_TX_LOCK_ASSERT(sc);
745 tap = ath_tx_get_tx_tid(an, tid->tid);
747 status = ATH_AGGR_ERROR;
751 h_baw = tap->txa_wnd / 2;
754 bf = ATH_TID_FIRST(tid);
755 if (bf_first == NULL)
758 status = ATH_AGGR_DONE;
762 * It's the first frame;
763 * set the aggregation limit based on the
764 * rate control decision that has been made.
766 aggr_limit = ath_get_aggr_limit(sc, bf_first);
769 /* Set this early just so things don't get confused */
773 * If the frame doesn't have a sequence number that we're
774 * tracking in the BAW (eg NULL QOS data frame), we can't
775 * aggregate it. Stop the aggregation process; the sender
776 * can then TX what's in the list thus far and then
777 * TX the frame individually.
779 if (! bf->bf_state.bfs_dobaw) {
780 status = ATH_AGGR_NONAGGR;
785 * If any of the rates are non-HT, this packet
786 * can't be aggregated.
787 * XXX TODO: add a bf_state flag which gets marked
788 * if any active rate is non-HT.
792 * do not exceed aggregation limit
794 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen;
796 (aggr_limit < (al + bpad + al_delta + prev_al))) {
797 status = ATH_AGGR_LIMITED;
802 * If RTS/CTS is set on the first frame, enforce
803 * the RTS aggregate limit.
805 if (bf_first->bf_state.bfs_txflags &
806 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) {
808 (sc->sc_rts_aggr_limit <
809 (al + bpad + al_delta + prev_al))) {
810 status = ATH_AGGR_8K_LIMITED;
816 * Do not exceed subframe limit.
818 if ((nframes + prev_frames) >= MIN((h_baw),
819 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) {
820 status = ATH_AGGR_LIMITED;
825 * If the current frame has an RTS/CTS configuration
826 * that differs from the first frame, override the
827 * subsequent frame with this config.
829 if (bf != bf_first) {
830 bf->bf_state.bfs_txflags &=
831 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
832 bf->bf_state.bfs_txflags |=
833 bf_first->bf_state.bfs_txflags &
834 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
838 * If the packet has a sequence number, do not
839 * step outside of the block-ack window.
841 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
842 SEQNO(bf->bf_state.bfs_seqno))) {
843 status = ATH_AGGR_BAW_CLOSED;
848 * this packet is part of an aggregate.
850 ATH_TID_REMOVE(tid, bf, bf_list);
852 /* The TID lock is required for the BAW update */
853 ath_tx_addto_baw(sc, an, tid, bf);
854 bf->bf_state.bfs_addedbaw = 1;
857 * XXX enforce ACK for aggregate frames (this needs to be
858 * XXX handled more gracefully?
860 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
861 device_printf(sc->sc_dev,
862 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n",
864 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK);
868 * Add the now owned buffer (which isn't
869 * on the software TXQ any longer) to our
870 * aggregate frame list.
872 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
875 /* Completion handler */
876 bf->bf_comp = ath_tx_aggr_comp;
879 * add padding for previous frame to aggregation length
881 al += bpad + al_delta;
884 * Calculate delimiters needed for the current frame
886 bf->bf_state.bfs_ndelim =
887 ath_compute_num_delims(sc, bf_first,
888 bf->bf_state.bfs_pktlen);
891 * Calculate the padding needed from this set of delimiters,
892 * used when calculating if the next frame will fit in
895 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2);
898 * Chain the buffers together
901 bf_prev->bf_next = bf;
905 * If we're leaking frames, just return at this point;
906 * we've queued a single frame and we don't want to add
909 if (tid->an->an_leak_count) {
910 status = ATH_AGGR_LEAK_CLOSED;
916 * terminate aggregation on a small packet boundary
918 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) {
919 status = ATH_AGGR_SHORTPKT;
928 * Just in case the list was empty when we tried to
929 * dequeue a packet ..
932 bf_first->bf_state.bfs_al = al;
933 bf_first->bf_state.bfs_nframes = nframes;