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_flags_ht & IEEE80211_FHT_LDPC_TX) &&
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,
405 uint16_t pktlen, int is_first)
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 for
462 * this exchange, and (b) (done) this is the first sub-frame
465 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR)
466 && ndelim < AH_FIRST_DESC_NDELIMS && is_first)
467 ndelim = AH_FIRST_DESC_NDELIMS;
470 * If sc_delim_min_pad is non-zero, enforce it as the minimum
471 * pad delimiter count.
473 if (sc->sc_delim_min_pad != 0)
474 ndelim = MAX(ndelim, sc->sc_delim_min_pad);
476 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
477 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n",
478 __func__, pktlen, ndelim, mpdudensity);
481 * If the MPDU density is 0, we can return here.
482 * Otherwise, we need to convert the desired mpdudensity
483 * into a byte length, based on the rate in the subframe.
485 if (mpdudensity == 0)
489 * Convert desired mpdu density from microeconds to bytes based
490 * on highest rate in rate series (i.e. first rate) to determine
491 * required minimum length for subframe. Take into account
492 * whether high rate is 20 or 40Mhz and half or full GI.
494 rix = first_bf->bf_state.bfs_rc[0].rix;
495 rc = rt->info[rix].rateCode;
496 flags = first_bf->bf_state.bfs_rc[0].flags;
497 width = !! (flags & ATH_RC_CW40_FLAG);
498 half_gi = !! (flags & ATH_RC_SGI_FLAG);
501 * mpdudensity is in 1/100th of a usec, so divide by 100
504 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity);
506 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity);
512 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
513 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
516 * Min length is the minimum frame length for the
517 * required MPDU density.
519 if (pktlen < minlen) {
520 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ;
521 ndelim = MAX(mindelim, ndelim);
524 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
525 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n",
526 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim);
533 * XXX TODO: put into net80211
536 ath_rx_ampdu_to_byte(char a)
539 case IEEE80211_HTCAP_MAXRXAMPDU_16K:
542 case IEEE80211_HTCAP_MAXRXAMPDU_32K:
545 case IEEE80211_HTCAP_MAXRXAMPDU_64K:
548 case IEEE80211_HTCAP_MAXRXAMPDU_8K:
556 * Fetch the aggregation limit.
558 * It's the lowest of the four rate series 4ms frame length.
560 * Also take into account the hardware specific limits (8KiB on AR5416)
561 * and per-peer limits in non-STA mode.
564 ath_get_aggr_limit(struct ath_softc *sc, struct ieee80211_node *ni,
567 struct ieee80211vap *vap = ni->ni_vap;
569 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
570 int amin = ATH_AGGR_MAXSIZE;
573 /* Extract out the maximum configured driver A-MPDU limit */
574 if (sc->sc_aggr_limit > 0 && sc->sc_aggr_limit < ATH_AGGR_MAXSIZE)
575 amin = sc->sc_aggr_limit;
577 /* Check the vap configured transmit limit */
578 amin = MIN(amin, ath_rx_ampdu_to_byte(vap->iv_ampdu_limit));
581 * Check the HTCAP field for the maximum size the node has
582 * negotiated. If it's smaller than what we have, cap it there.
584 amin = MIN(amin, ath_rx_ampdu_to_byte(MS(ni->ni_htparam,
585 IEEE80211_HTCAP_MAXRXAMPDU)));
587 for (i = 0; i < ATH_RC_NUM; i++) {
588 if (bf->bf_state.bfs_rc[i].tries == 0)
590 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen);
593 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
594 "%s: aggr_limit=%d, iv_ampdu_limit=%d, "
595 "peer maxrxampdu=%d, max frame len=%d\n",
599 MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU),
607 * Setup a 11n rate series structure
609 * This should be called for both legacy and MCS rates.
611 * This uses the rate series stuf from ath_tx_rate_fill_rcflags().
613 * It, along with ath_buf_set_rate, must be called -after- a burst
614 * or aggregate is setup.
617 ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni,
618 struct ath_buf *bf, HAL_11N_RATE_SERIES *series)
620 struct ieee80211com *ic = ni->ni_ic;
621 struct ath_hal *ah = sc->sc_ah;
622 HAL_BOOL shortPreamble = AH_FALSE;
623 const HAL_RATE_TABLE *rt = sc->sc_currates;
626 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
628 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
629 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
630 shortPreamble = AH_TRUE;
633 * If this is the first frame in an aggregate series,
634 * use the aggregate length.
636 if (bf->bf_state.bfs_aggr)
637 pktlen = bf->bf_state.bfs_al;
639 pktlen = bf->bf_state.bfs_pktlen;
642 * XXX TODO: modify this routine to use the bfs_rc[x].flags
645 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4);
646 for (i = 0; i < ATH_RC_NUM; i++) {
647 /* Only set flags for actual TX attempts */
648 if (rc[i].tries == 0)
651 series[i].Tries = rc[i].tries;
654 * XXX TODO: When the NIC is capable of three stream TX,
655 * transmit 1/2 stream rates on two streams.
657 * This reduces the power consumption of the NIC and
658 * keeps it within the PCIe slot power limits.
660 series[i].ChSel = sc->sc_cur_txchainmask;
663 * Setup rate and TX power cap for this series.
665 series[i].Rate = rt->info[rc[i].rix].rateCode;
666 series[i].RateIndex = rc[i].rix;
667 series[i].tx_power_cap = rc[i].tx_power_cap;
670 * Enable RTS/CTS as appropriate.
672 if (rc[i].flags & ATH_RC_RTSCTS_FLAG)
673 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS;
676 * 11n rate? Update 11n flags.
678 if (rc[i].flags & ATH_RC_HT_FLAG) {
679 if (rc[i].flags & ATH_RC_CW40_FLAG)
680 series[i].RateFlags |= HAL_RATESERIES_2040;
682 if (rc[i].flags & ATH_RC_SGI_FLAG)
683 series[i].RateFlags |= HAL_RATESERIES_HALFGI;
685 if (rc[i].flags & ATH_RC_STBC_FLAG)
686 series[i].RateFlags |= HAL_RATESERIES_STBC;
690 * TODO: If we're all doing 11n rates then we can set LDPC.
691 * If we've been asked to /do/ LDPC but we are handed a
692 * legacy rate, then we should complain. Loudly.
696 * PktDuration doesn't include slot, ACK, RTS, etc timing -
697 * it's just the packet duration
699 if (rc[i].flags & ATH_RC_HT_FLAG) {
700 series[i].PktDuration =
701 ath_computedur_ht(pktlen
703 , HT_RC_2_STREAMS(series[i].Rate)
704 , series[i].RateFlags & HAL_RATESERIES_2040
705 , series[i].RateFlags & HAL_RATESERIES_HALFGI);
709 rt->info[rc[i].rix].shortPreamble;
710 /* XXX TODO: don't include SIFS */
711 series[i].PktDuration = ath_hal_computetxtime(ah,
712 rt, pktlen, rc[i].rix, shortPreamble, AH_TRUE);
719 ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series)
722 for (i = 0; i < ATH_RC_NUM; i++) {
723 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; "
724 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n",
728 series[i].PktDuration,
730 series[i].tx_power_cap,
731 series[i].RateFlags);
737 * Setup the 11n rate scenario and burst duration for the given TX descriptor
740 * This isn't useful for sending beacon frames, which has different needs
741 * wrt what's passed into the rate scenario function.
744 ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni,
747 HAL_11N_RATE_SERIES series[4];
748 struct ath_desc *ds = bf->bf_desc;
749 struct ath_hal *ah = sc->sc_ah;
750 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL);
751 int ctsrate = bf->bf_state.bfs_ctsrate;
752 int flags = bf->bf_state.bfs_txflags;
754 /* Setup rate scenario */
755 memset(&series, 0, sizeof(series));
757 ath_rateseries_setup(sc, ni, bf, series);
760 if (sc->sc_debug & ATH_DEBUG_XMIT)
761 ath_rateseries_print(sc, series);
764 /* Set rate scenario */
766 * Note: Don't allow hardware to override the duration on
769 ath_hal_set11nratescenario(ah, ds,
770 !is_pspoll, /* whether to override the duration or not */
771 ctsrate, /* rts/cts rate */
772 series, /* 11n rate series */
773 4, /* number of series */
776 /* Set burst duration */
778 * This is only required when doing 11n burst, not aggregation
779 * ie, if there's a second frame in a RIFS or A-MPDU burst
780 * w/ >1 A-MPDU frame bursting back to back.
781 * Normal A-MPDU doesn't do bursting -between- aggregates.
783 * .. and it's highly likely this won't ever be implemented
785 //ath_hal_set11nburstduration(ah, ds, 8192);
789 * Form an aggregate packet list.
791 * This function enforces the aggregate restrictions/requirements.
795 * + The aggregate size maximum (64k for AR9160 and later, 8K for
796 * AR5416 when doing RTS frame protection.)
797 * + Maximum number of sub-frames for an aggregate
798 * + The aggregate delimiter size, giving MACs time to do whatever is
799 * needed before each frame
800 * + Enforce the BAW limit
802 * Each descriptor queued should have the DMA setup.
803 * The rate series, descriptor setup, linking, etc is all done
804 * externally. This routine simply chains them together.
805 * ath_tx_setds_11n() will take care of configuring the per-
806 * descriptor setup, and ath_buf_set_rate() will configure the
809 * The TID lock is required for the entirety of this function.
811 * If some code in another thread adds to the head of this
812 * list, very strange behaviour will occur. Since retransmission is the
813 * only reason this will occur, and this routine is designed to be called
814 * from within the scheduler task, it won't ever clash with the completion
817 * So if you want to call this from an upper layer context (eg, to direct-
818 * dispatch aggregate frames to the hardware), please keep this in mind.
821 ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an,
822 struct ath_tid *tid, ath_bufhead *bf_q)
824 //struct ieee80211_node *ni = &an->an_node;
825 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL;
827 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw;
828 struct ieee80211_tx_ampdu *tap;
829 int status = ATH_AGGR_DONE;
830 int prev_frames = 0; /* XXX for AR5416 burst, not done here */
831 int prev_al = 0; /* XXX also for AR5416 burst */
833 ATH_TX_LOCK_ASSERT(sc);
835 tap = ath_tx_get_tx_tid(an, tid->tid);
837 status = ATH_AGGR_ERROR;
841 h_baw = tap->txa_wnd / 2;
844 bf = ATH_TID_FIRST(tid);
845 if (bf_first == NULL)
848 status = ATH_AGGR_DONE;
852 * It's the first frame;
853 * set the aggregation limit based on the
854 * rate control decision that has been made.
856 aggr_limit = ath_get_aggr_limit(sc, &an->an_node,
860 /* Set this early just so things don't get confused */
864 * If the frame doesn't have a sequence number that we're
865 * tracking in the BAW (eg NULL QOS data frame), we can't
866 * aggregate it. Stop the aggregation process; the sender
867 * can then TX what's in the list thus far and then
868 * TX the frame individually.
870 if (! bf->bf_state.bfs_dobaw) {
871 status = ATH_AGGR_NONAGGR;
876 * If any of the rates are non-HT, this packet
877 * can't be aggregated.
878 * XXX TODO: add a bf_state flag which gets marked
879 * if any active rate is non-HT.
883 * do not exceed aggregation limit
885 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen;
887 (aggr_limit < (al + bpad + al_delta + prev_al))) {
888 status = ATH_AGGR_LIMITED;
893 * If RTS/CTS is set on the first frame, enforce
894 * the RTS aggregate limit.
896 if (bf_first->bf_state.bfs_txflags &
897 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) {
899 (sc->sc_rts_aggr_limit <
900 (al + bpad + al_delta + prev_al))) {
901 status = ATH_AGGR_8K_LIMITED;
907 * Do not exceed subframe limit.
909 if ((nframes + prev_frames) >= MIN((h_baw),
910 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) {
911 status = ATH_AGGR_LIMITED;
916 * If the current frame has an RTS/CTS configuration
917 * that differs from the first frame, override the
918 * subsequent frame with this config.
920 if (bf != bf_first) {
921 bf->bf_state.bfs_txflags &=
922 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
923 bf->bf_state.bfs_txflags |=
924 bf_first->bf_state.bfs_txflags &
925 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
929 * If the packet has a sequence number, do not
930 * step outside of the block-ack window.
932 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
933 SEQNO(bf->bf_state.bfs_seqno))) {
934 status = ATH_AGGR_BAW_CLOSED;
939 * this packet is part of an aggregate.
941 ATH_TID_REMOVE(tid, bf, bf_list);
943 /* The TID lock is required for the BAW update */
944 ath_tx_addto_baw(sc, an, tid, bf);
945 bf->bf_state.bfs_addedbaw = 1;
948 * XXX enforce ACK for aggregate frames (this needs to be
949 * XXX handled more gracefully?
951 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
952 device_printf(sc->sc_dev,
953 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n",
955 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK);
959 * Add the now owned buffer (which isn't
960 * on the software TXQ any longer) to our
961 * aggregate frame list.
963 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
966 /* Completion handler */
967 bf->bf_comp = ath_tx_aggr_comp;
970 * add padding for previous frame to aggregation length
972 al += bpad + al_delta;
975 * Calculate delimiters needed for the current frame
977 bf->bf_state.bfs_ndelim =
978 ath_compute_num_delims(sc, bf_first,
979 bf->bf_state.bfs_pktlen, (bf_first == bf));
982 * Calculate the padding needed from this set of delimiters,
983 * used when calculating if the next frame will fit in
986 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2);
989 * Chain the buffers together
992 bf_prev->bf_next = bf;
996 * If we're leaking frames, just return at this point;
997 * we've queued a single frame and we don't want to add
1000 if (tid->an->an_leak_count) {
1001 status = ATH_AGGR_LEAK_CLOSED;
1007 * terminate aggregation on a small packet boundary
1009 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) {
1010 status = ATH_AGGR_SHORTPKT;
1019 * Just in case the list was empty when we tried to
1020 * dequeue a packet ..
1023 bf_first->bf_state.bfs_al = al;
1024 bf_first->bf_state.bfs_nframes = nframes;