2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer,
12 * without modification.
13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
15 * redistribution must be conditioned upon including a substantially
16 * similar Disclaimer requirement for further binary redistribution.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
23 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
24 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
27 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
29 * THE POSSIBILITY OF SUCH DAMAGES.
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/sysctl.h>
43 #include <sys/malloc.h>
45 #include <sys/mutex.h>
46 #include <sys/kernel.h>
47 #include <sys/socket.h>
48 #include <sys/sockio.h>
49 #include <sys/errno.h>
50 #include <sys/callout.h>
52 #include <sys/endian.h>
53 #include <sys/kthread.h>
54 #include <sys/taskqueue.h>
57 #include <machine/bus.h>
60 #include <net/if_dl.h>
61 #include <net/if_media.h>
62 #include <net/if_types.h>
63 #include <net/if_arp.h>
64 #include <net/ethernet.h>
65 #include <net/if_llc.h>
67 #include <net80211/ieee80211_var.h>
68 #include <net80211/ieee80211_regdomain.h>
69 #ifdef IEEE80211_SUPPORT_SUPERG
70 #include <net80211/ieee80211_superg.h>
72 #ifdef IEEE80211_SUPPORT_TDMA
73 #include <net80211/ieee80211_tdma.h>
79 #include <netinet/in.h>
80 #include <netinet/if_ether.h>
83 #include <dev/ath/if_athvar.h>
84 #include <dev/ath/ath_hal/ah_devid.h> /* XXX for softled */
85 #include <dev/ath/ath_hal/ah_diagcodes.h>
88 #include <dev/ath/ath_tx99/ath_tx99.h>
91 #include <dev/ath/if_ath_tx.h> /* XXX for some support functions */
92 #include <dev/ath/if_ath_tx_ht.h>
93 #include <dev/ath/if_athrate.h>
94 #include <dev/ath/if_ath_debug.h>
99 #define IEEE80211_AMPDU_SUBFRAME_DEFAULT 32
101 #define ATH_AGGR_DELIM_SZ 4 /* delimiter size */
102 #define ATH_AGGR_MINPLEN 256 /* in bytes, minimum packet length */
103 /* number of delimiters for encryption padding */
104 #define ATH_AGGR_ENCRYPTDELIM 10
107 * returns delimiter padding required given the packet length
109 #define ATH_AGGR_GET_NDELIM(_len) \
110 (((((_len) + ATH_AGGR_DELIM_SZ) < ATH_AGGR_MINPLEN) ? \
111 (ATH_AGGR_MINPLEN - (_len) - ATH_AGGR_DELIM_SZ) : 0) >> 2)
113 #define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
115 int ath_max_4ms_framelen[4][32] = {
117 3212, 6432, 9648, 12864, 19300, 25736, 28952, 32172,
118 6424, 12852, 19280, 25708, 38568, 51424, 57852, 64280,
119 9628, 19260, 28896, 38528, 57792, 65532, 65532, 65532,
120 12828, 25656, 38488, 51320, 65532, 65532, 65532, 65532,
123 3572, 7144, 10720, 14296, 21444, 28596, 32172, 35744,
124 7140, 14284, 21428, 28568, 42856, 57144, 64288, 65532,
125 10700, 21408, 32112, 42816, 64228, 65532, 65532, 65532,
126 14256, 28516, 42780, 57040, 65532, 65532, 65532, 65532,
129 6680, 13360, 20044, 26724, 40092, 53456, 60140, 65532,
130 13348, 26700, 40052, 53400, 65532, 65532, 65532, 65532,
131 20004, 40008, 60016, 65532, 65532, 65532, 65532, 65532,
132 26644, 53292, 65532, 65532, 65532, 65532, 65532, 65532,
135 7420, 14844, 22272, 29696, 44544, 59396, 65532, 65532,
136 14832, 29668, 44504, 59340, 65532, 65532, 65532, 65532,
137 22232, 44464, 65532, 65532, 65532, 65532, 65532, 65532,
138 29616, 59232, 65532, 65532, 65532, 65532, 65532, 65532,
143 * XXX should be in net80211
145 static int ieee80211_mpdudensity_map[] = {
146 0, /* IEEE80211_HTCAP_MPDUDENSITY_NA */
147 25, /* IEEE80211_HTCAP_MPDUDENSITY_025 */
148 50, /* IEEE80211_HTCAP_MPDUDENSITY_05 */
149 100, /* IEEE80211_HTCAP_MPDUDENSITY_1 */
150 200, /* IEEE80211_HTCAP_MPDUDENSITY_2 */
151 400, /* IEEE80211_HTCAP_MPDUDENSITY_4 */
152 800, /* IEEE80211_HTCAP_MPDUDENSITY_8 */
153 1600, /* IEEE80211_HTCAP_MPDUDENSITY_16 */
157 * XXX should be in the HAL/net80211 ?
159 #define BITS_PER_BYTE 8
160 #define OFDM_PLCP_BITS 22
161 #define HT_RC_2_MCS(_rc) ((_rc) & 0x7f)
162 #define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1)
168 #define HT_LTF(_ns) (4 * (_ns))
169 #define SYMBOL_TIME(_ns) ((_ns) << 2) // ns * 4 us
170 #define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) // ns * 3.6 us
171 #define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
172 #define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
173 #define IS_HT_RATE(_rate) ((_rate) & 0x80)
175 const uint32_t bits_per_symbol[][2] = {
177 { 26, 54 }, // 0: BPSK
178 { 52, 108 }, // 1: QPSK 1/2
179 { 78, 162 }, // 2: QPSK 3/4
180 { 104, 216 }, // 3: 16-QAM 1/2
181 { 156, 324 }, // 4: 16-QAM 3/4
182 { 208, 432 }, // 5: 64-QAM 2/3
183 { 234, 486 }, // 6: 64-QAM 3/4
184 { 260, 540 }, // 7: 64-QAM 5/6
185 { 52, 108 }, // 8: BPSK
186 { 104, 216 }, // 9: QPSK 1/2
187 { 156, 324 }, // 10: QPSK 3/4
188 { 208, 432 }, // 11: 16-QAM 1/2
189 { 312, 648 }, // 12: 16-QAM 3/4
190 { 416, 864 }, // 13: 64-QAM 2/3
191 { 468, 972 }, // 14: 64-QAM 3/4
192 { 520, 1080 }, // 15: 64-QAM 5/6
193 { 78, 162 }, // 16: BPSK
194 { 156, 324 }, // 17: QPSK 1/2
195 { 234, 486 }, // 18: QPSK 3/4
196 { 312, 648 }, // 19: 16-QAM 1/2
197 { 468, 972 }, // 20: 16-QAM 3/4
198 { 624, 1296 }, // 21: 64-QAM 2/3
199 { 702, 1458 }, // 22: 64-QAM 3/4
200 { 780, 1620 }, // 23: 64-QAM 5/6
201 { 104, 216 }, // 24: BPSK
202 { 208, 432 }, // 25: QPSK 1/2
203 { 312, 648 }, // 26: QPSK 3/4
204 { 416, 864 }, // 27: 16-QAM 1/2
205 { 624, 1296 }, // 28: 16-QAM 3/4
206 { 832, 1728 }, // 29: 64-QAM 2/3
207 { 936, 1944 }, // 30: 64-QAM 3/4
208 { 1040, 2160 }, // 31: 64-QAM 5/6
212 * Fill in the rate array information based on the current
213 * node configuration and the choices made by the rate
214 * selection code and ath_buf setup code.
216 * Later on, this may end up also being made by the
217 * rate control code, but for now it can live here.
219 * This needs to be called just before the packet is
220 * queued to the software queue or hardware queue,
221 * so all of the needed fields in bf_state are setup.
224 ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf)
226 struct ieee80211_node *ni = bf->bf_node;
227 struct ieee80211vap *vap = ni->ni_vap;
228 struct ieee80211com *ic = ni->ni_ic;
229 const HAL_RATE_TABLE *rt = sc->sc_currates;
230 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
237 * We only do LDPC if the rate is 11n, both we and the
238 * receiver support LDPC and it's enabled.
240 * It's a global flag, not a per-try flag, so we clear
241 * it if any of the rate entries aren't 11n.
244 if ((ni->ni_vap->iv_flags_ht & IEEE80211_FHT_LDPC_TX) &&
245 (ni->ni_htcap & IEEE80211_HTCAP_LDPC))
249 * The 11n duration calculation doesn't know about LDPC,
250 * so don't enable it for positioning.
252 if (bf->bf_flags & ATH_BUF_TOA_PROBE)
257 for (i = 0; i < ATH_RC_NUM; i++) {
259 if (rc[i].tries == 0)
262 rate = rt->info[rc[i].rix].rateCode;
265 * Only enable short preamble for legacy rates
267 if ((! IS_HT_RATE(rate)) && bf->bf_state.bfs_shpream)
268 rate |= rt->info[rc[i].rix].shortPreamble;
271 * Save this, used by the TX and completion code
273 rc[i].ratecode = rate;
275 if (bf->bf_state.bfs_txflags &
276 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
277 rc[i].flags |= ATH_RC_RTSCTS_FLAG;
280 * If we can't do LDPC, don't.
282 if (! IS_HT_RATE(rate))
285 /* Only enable shortgi, 2040, dual-stream if HT is set */
286 if (IS_HT_RATE(rate)) {
287 rc[i].flags |= ATH_RC_HT_FLAG;
289 if (ni->ni_chw == 40)
290 rc[i].flags |= ATH_RC_CW40_FLAG;
293 * NOTE: Don't do short-gi for positioning frames.
295 * For now, the ath_hal and net80211 HT duration
296 * calculation rounds up the 11n data txtime
297 * to the nearest multiple of 3.6 microseconds
298 * and doesn't return the fractional part, so
299 * we are always "out" by some amount.
301 if (ni->ni_chw == 40 &&
302 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 &&
303 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40 &&
304 vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40 &&
305 (bf->bf_flags & ATH_BUF_TOA_PROBE) == 0) {
306 rc[i].flags |= ATH_RC_SGI_FLAG;
309 if (ni->ni_chw == 20 &&
310 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 &&
311 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20 &&
312 vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20 &&
313 (bf->bf_flags & ATH_BUF_TOA_PROBE) == 0) {
314 rc[i].flags |= ATH_RC_SGI_FLAG;
318 * If we have STBC TX enabled and the receiver
319 * can receive (at least) 1 stream STBC, AND it's
320 * MCS 0-7, AND we have at least two chains enabled,
321 * and we're not doing positioning, enable STBC.
323 if (ic->ic_htcaps & IEEE80211_HTCAP_TXSTBC &&
324 (ni->ni_vap->iv_flags_ht & IEEE80211_FHT_STBC_TX) &&
325 (ni->ni_htcap & IEEE80211_HTCAP_RXSTBC) &&
326 (sc->sc_cur_txchainmask > 1) &&
327 (HT_RC_2_STREAMS(rate) == 1) &&
328 (bf->bf_flags & ATH_BUF_TOA_PROBE) == 0) {
329 rc[i].flags |= ATH_RC_STBC_FLAG;
334 * Dual / Triple stream rate?
336 if (HT_RC_2_STREAMS(rate) == 2)
337 rc[i].flags |= ATH_RC_DS_FLAG;
338 else if (HT_RC_2_STREAMS(rate) == 3)
339 rc[i].flags |= ATH_RC_TS_FLAG;
343 * Calculate the maximum TX power cap for the current
346 rc[i].tx_power_cap = ieee80211_get_node_txpower(ni);
349 * Calculate the maximum 4ms frame length based
350 * on the MCS rate, SGI and channel width flags.
352 if ((rc[i].flags & ATH_RC_HT_FLAG) &&
353 (HT_RC_2_MCS(rate) < 32)) {
355 if (rc[i].flags & ATH_RC_CW40_FLAG) {
356 if (rc[i].flags & ATH_RC_SGI_FLAG)
361 if (rc[i].flags & ATH_RC_SGI_FLAG)
366 rc[i].max4msframelen =
367 ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)];
369 rc[i].max4msframelen = 0;
370 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
371 "%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n",
372 __func__, i, rate, rc[i].flags, rc[i].max4msframelen);
376 * LDPC is a global flag, so ...
379 bf->bf_state.bfs_txflags |= HAL_TXDESC_LDPC;
380 sc->sc_stats.ast_tx_ldpc++;
384 sc->sc_stats.ast_tx_stbc++;
389 * Return the number of delimiters to be added to
390 * meet the minimum required mpdudensity.
392 * Caller should make sure that the rate is HT.
394 * TODO: is this delimiter calculation supposed to be the
395 * total frame length, the hdr length, the data length (including
396 * delimiters, padding, CRC, etc) or ?
398 * TODO: this should ensure that the rate control information
399 * HAS been setup for the first rate.
401 * TODO: ensure this is only called for MCS rates.
403 * TODO: enforce MCS < 31
406 ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf,
407 uint16_t pktlen, int is_first)
409 const HAL_RATE_TABLE *rt = sc->sc_currates;
410 struct ieee80211_node *ni = first_bf->bf_node;
411 struct ieee80211vap *vap = ni->ni_vap;
412 int ndelim, mindelim = 0;
413 int mpdudensity; /* in 1/100'th of a microsecond */
414 int peer_mpdudensity; /* net80211 value */
415 uint8_t rc, rix, flags;
417 uint32_t nsymbits, nsymbols;
421 * Get the advertised density from the node.
424 _IEEE80211_MASKSHIFT(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
427 * vap->iv_ampdu_density is a net80211 value, rather than the actual
428 * density. Larger values are longer A-MPDU density spacing values,
429 * and we want to obey larger configured / negotiated density values
430 * per station if we get it.
432 if (vap->iv_ampdu_density > peer_mpdudensity)
433 peer_mpdudensity = vap->iv_ampdu_density;
436 * Convert the A-MPDU density net80211 value to a 1/100 microsecond
437 * value for subsequent calculations.
439 if (peer_mpdudensity > IEEE80211_HTCAP_MPDUDENSITY_16)
440 mpdudensity = 1600; /* maximum density */
442 mpdudensity = ieee80211_mpdudensity_map[peer_mpdudensity];
444 /* Select standard number of delimiters based on frame length */
445 ndelim = ATH_AGGR_GET_NDELIM(pktlen);
448 * If encryption is enabled, add extra delimiters to let the
449 * crypto hardware catch up. This could be tuned per-MAC and
450 * per-rate, but for now we'll simply assume encryption is
453 * Also note that the Atheros reference driver inserts two
454 * delimiters by default for pre-AR9380 peers. This will
455 * include "that" required delimiter.
457 ndelim += ATH_AGGR_ENCRYPTDELIM;
460 * For AR9380, there's a minimum number of delimeters
461 * required when doing RTS.
463 * XXX TODO: this is only needed if (a) RTS/CTS is enabled for
464 * this exchange, and (b) (done) this is the first sub-frame
467 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR)
468 && ndelim < AH_FIRST_DESC_NDELIMS && is_first)
469 ndelim = AH_FIRST_DESC_NDELIMS;
472 * If sc_delim_min_pad is non-zero, enforce it as the minimum
473 * pad delimiter count.
475 if (sc->sc_delim_min_pad != 0)
476 ndelim = MAX(ndelim, sc->sc_delim_min_pad);
478 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
479 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n",
480 __func__, pktlen, ndelim, mpdudensity);
483 * If the MPDU density is 0, we can return here.
484 * Otherwise, we need to convert the desired mpdudensity
485 * into a byte length, based on the rate in the subframe.
487 if (mpdudensity == 0)
491 * Convert desired mpdu density from microeconds to bytes based
492 * on highest rate in rate series (i.e. first rate) to determine
493 * required minimum length for subframe. Take into account
494 * whether high rate is 20 or 40Mhz and half or full GI.
496 rix = first_bf->bf_state.bfs_rc[0].rix;
497 rc = rt->info[rix].rateCode;
498 flags = first_bf->bf_state.bfs_rc[0].flags;
499 width = !! (flags & ATH_RC_CW40_FLAG);
500 half_gi = !! (flags & ATH_RC_SGI_FLAG);
503 * mpdudensity is in 1/100th of a usec, so divide by 100
506 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity);
508 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity);
514 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
515 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
518 * Min length is the minimum frame length for the
519 * required MPDU density.
521 if (pktlen < minlen) {
522 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ;
523 ndelim = MAX(mindelim, ndelim);
526 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
527 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n",
528 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim);
534 * XXX TODO: put into net80211
537 ath_rx_ampdu_to_byte(char a)
540 case IEEE80211_HTCAP_MAXRXAMPDU_16K:
543 case IEEE80211_HTCAP_MAXRXAMPDU_32K:
546 case IEEE80211_HTCAP_MAXRXAMPDU_64K:
549 case IEEE80211_HTCAP_MAXRXAMPDU_8K:
557 * Fetch the aggregation limit.
559 * It's the lowest of the four rate series 4ms frame length.
561 * Also take into account the hardware specific limits (8KiB on AR5416)
562 * and per-peer limits in non-STA mode.
565 ath_get_aggr_limit(struct ath_softc *sc, struct ieee80211_node *ni,
568 struct ieee80211vap *vap = ni->ni_vap;
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(
585 _IEEE80211_MASKSHIFT(ni->ni_htparam, 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 _IEEE80211_MASKSHIFT(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU),
606 * Setup a 11n rate series structure
608 * This should be called for both legacy and MCS rates.
610 * This uses the rate series stuf from ath_tx_rate_fill_rcflags().
612 * It, along with ath_buf_set_rate, must be called -after- a burst
613 * or aggregate is setup.
616 ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni,
617 struct ath_buf *bf, HAL_11N_RATE_SERIES *series)
619 struct ieee80211com *ic = ni->ni_ic;
620 struct ath_hal *ah = sc->sc_ah;
621 HAL_BOOL shortPreamble = AH_FALSE;
622 const HAL_RATE_TABLE *rt = sc->sc_currates;
625 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
627 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
628 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
629 shortPreamble = AH_TRUE;
632 * If this is the first frame in an aggregate series,
633 * use the aggregate length.
635 if (bf->bf_state.bfs_aggr)
636 pktlen = bf->bf_state.bfs_al;
638 pktlen = bf->bf_state.bfs_pktlen;
641 * XXX TODO: modify this routine to use the bfs_rc[x].flags
644 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4);
645 for (i = 0; i < ATH_RC_NUM; i++) {
646 /* Only set flags for actual TX attempts */
647 if (rc[i].tries == 0)
650 series[i].Tries = rc[i].tries;
653 * XXX TODO: When the NIC is capable of three stream TX,
654 * transmit 1/2 stream rates on two streams.
656 * This reduces the power consumption of the NIC and
657 * keeps it within the PCIe slot power limits.
659 series[i].ChSel = sc->sc_cur_txchainmask;
662 * Setup rate and TX power cap for this series.
664 series[i].Rate = rt->info[rc[i].rix].rateCode;
665 series[i].RateIndex = rc[i].rix;
666 series[i].tx_power_cap = rc[i].tx_power_cap;
669 * Enable RTS/CTS as appropriate.
671 if (rc[i].flags & ATH_RC_RTSCTS_FLAG)
672 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS;
675 * 11n rate? Update 11n flags.
677 if (rc[i].flags & ATH_RC_HT_FLAG) {
678 if (rc[i].flags & ATH_RC_CW40_FLAG)
679 series[i].RateFlags |= HAL_RATESERIES_2040;
681 if (rc[i].flags & ATH_RC_SGI_FLAG)
682 series[i].RateFlags |= HAL_RATESERIES_HALFGI;
684 if (rc[i].flags & ATH_RC_STBC_FLAG)
685 series[i].RateFlags |= HAL_RATESERIES_STBC;
689 * TODO: If we're all doing 11n rates then we can set LDPC.
690 * If we've been asked to /do/ LDPC but we are handed a
691 * legacy rate, then we should complain. Loudly.
695 * PktDuration doesn't include slot, ACK, RTS, etc timing -
696 * it's just the packet duration
698 if (rc[i].flags & ATH_RC_HT_FLAG) {
699 series[i].PktDuration =
700 ath_computedur_ht(pktlen
702 , HT_RC_2_STREAMS(series[i].Rate)
703 , series[i].RateFlags & HAL_RATESERIES_2040
704 , series[i].RateFlags & HAL_RATESERIES_HALFGI);
708 rt->info[rc[i].rix].shortPreamble;
709 /* XXX TODO: don't include SIFS */
710 series[i].PktDuration = ath_hal_computetxtime(ah,
711 rt, pktlen, rc[i].rix, shortPreamble, AH_TRUE);
718 ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series)
721 for (i = 0; i < ATH_RC_NUM; i++) {
722 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; "
723 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n",
727 series[i].PktDuration,
729 series[i].tx_power_cap,
730 series[i].RateFlags);
736 * Setup the 11n rate scenario and burst duration for the given TX descriptor
739 * This isn't useful for sending beacon frames, which has different needs
740 * wrt what's passed into the rate scenario function.
743 ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni,
746 HAL_11N_RATE_SERIES series[4];
747 struct ath_desc *ds = bf->bf_desc;
748 struct ath_hal *ah = sc->sc_ah;
749 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL);
750 int ctsrate = bf->bf_state.bfs_ctsrate;
751 int flags = bf->bf_state.bfs_txflags;
753 /* Setup rate scenario */
754 memset(&series, 0, sizeof(series));
756 ath_rateseries_setup(sc, ni, bf, series);
759 if (sc->sc_debug & ATH_DEBUG_XMIT)
760 ath_rateseries_print(sc, series);
763 /* Set rate scenario */
765 * Note: Don't allow hardware to override the duration on
768 ath_hal_set11nratescenario(ah, ds,
769 !is_pspoll, /* whether to override the duration or not */
770 ctsrate, /* rts/cts rate */
771 series, /* 11n rate series */
772 4, /* number of series */
775 /* Set burst duration */
777 * This is only required when doing 11n burst, not aggregation
778 * ie, if there's a second frame in a RIFS or A-MPDU burst
779 * w/ >1 A-MPDU frame bursting back to back.
780 * Normal A-MPDU doesn't do bursting -between- aggregates.
782 * .. and it's highly likely this won't ever be implemented
784 //ath_hal_set11nburstduration(ah, ds, 8192);
788 * Form an aggregate packet list.
790 * This function enforces the aggregate restrictions/requirements.
794 * + The aggregate size maximum (64k for AR9160 and later, 8K for
795 * AR5416 when doing RTS frame protection.)
796 * + Maximum number of sub-frames for an aggregate
797 * + The aggregate delimiter size, giving MACs time to do whatever is
798 * needed before each frame
799 * + Enforce the BAW limit
801 * Each descriptor queued should have the DMA setup.
802 * The rate series, descriptor setup, linking, etc is all done
803 * externally. This routine simply chains them together.
804 * ath_tx_setds_11n() will take care of configuring the per-
805 * descriptor setup, and ath_buf_set_rate() will configure the
808 * The TID lock is required for the entirety of this function.
810 * If some code in another thread adds to the head of this
811 * list, very strange behaviour will occur. Since retransmission is the
812 * only reason this will occur, and this routine is designed to be called
813 * from within the scheduler task, it won't ever clash with the completion
816 * So if you want to call this from an upper layer context (eg, to direct-
817 * dispatch aggregate frames to the hardware), please keep this in mind.
820 ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an,
821 struct ath_tid *tid, ath_bufhead *bf_q)
823 //struct ieee80211_node *ni = &an->an_node;
824 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL;
826 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw;
827 struct ieee80211_tx_ampdu *tap;
828 int status = ATH_AGGR_DONE;
829 int prev_frames = 0; /* XXX for AR5416 burst, not done here */
830 int prev_al = 0; /* XXX also for AR5416 burst */
832 ATH_TX_LOCK_ASSERT(sc);
834 tap = ath_tx_get_tx_tid(an, tid->tid);
836 status = ATH_AGGR_ERROR;
841 * Limit the maximum number of frames in this A-MPDU
842 * to half of the window size. This is done to prevent
843 * sending a LOT of frames that may fail in one batch
844 * when operating in higher MCS rates. If there are more
845 * frames available to send then up to two A-MPDUs will
846 * be queued per hardware queue, so we'll "just" get
849 h_baw = tap->txa_wnd / 2;
852 bf = ATH_TID_FIRST(tid);
854 status = ATH_AGGR_DONE;
857 if (bf_first == NULL) {
860 * It's the first frame;
861 * set the aggregation limit based on the
862 * rate control decision that has been made.
864 aggr_limit = ath_get_aggr_limit(sc, &an->an_node,
866 if (bf_first->bf_state.bfs_rc_maxpktlen > 0) {
867 aggr_limit = MIN(aggr_limit,
868 bf_first->bf_state.bfs_rc_maxpktlen);
872 /* Set this early just so things don't get confused */
876 * If the frame doesn't have a sequence number that we're
877 * tracking in the BAW (eg NULL QOS data frame), we can't
878 * aggregate it. Stop the aggregation process; the sender
879 * can then TX what's in the list thus far and then
880 * TX the frame individually.
882 if (! bf->bf_state.bfs_dobaw) {
883 status = ATH_AGGR_NONAGGR;
888 * If any of the rates are non-HT, this packet
889 * can't be aggregated.
890 * XXX TODO: add a bf_state flag which gets marked
891 * if any active rate is non-HT.
895 * do not exceed aggregation limit
897 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen;
899 (aggr_limit < (al + bpad + al_delta + prev_al))) {
900 status = ATH_AGGR_LIMITED;
905 * If RTS/CTS is set on the first frame, enforce
906 * the RTS aggregate limit.
908 if (bf_first->bf_state.bfs_txflags &
909 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) {
911 (sc->sc_rts_aggr_limit <
912 (al + bpad + al_delta + prev_al))) {
913 status = ATH_AGGR_8K_LIMITED;
919 * Do not exceed subframe limit.
921 if ((nframes + prev_frames) >= MIN((h_baw),
922 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) {
923 status = ATH_AGGR_LIMITED;
928 * If the current frame has an RTS/CTS configuration
929 * that differs from the first frame, override the
930 * subsequent frame with this config.
932 if (bf != bf_first) {
933 bf->bf_state.bfs_txflags &=
934 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
935 bf->bf_state.bfs_txflags |=
936 bf_first->bf_state.bfs_txflags &
937 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
941 * If the packet has a sequence number, do not
942 * step outside of the block-ack window.
944 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
945 SEQNO(bf->bf_state.bfs_seqno))) {
946 status = ATH_AGGR_BAW_CLOSED;
951 * this packet is part of an aggregate.
953 ATH_TID_REMOVE(tid, bf, bf_list);
955 /* The TID lock is required for the BAW update */
956 ath_tx_addto_baw(sc, an, tid, bf);
957 bf->bf_state.bfs_addedbaw = 1;
960 * XXX enforce ACK for aggregate frames (this needs to be
961 * XXX handled more gracefully?
963 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
964 device_printf(sc->sc_dev,
965 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n",
967 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK);
971 * Add the now owned buffer (which isn't
972 * on the software TXQ any longer) to our
973 * aggregate frame list.
975 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
978 /* Completion handler */
979 bf->bf_comp = ath_tx_aggr_comp;
982 * add padding for previous frame to aggregation length
984 al += bpad + al_delta;
987 * Calculate delimiters needed for the current frame
989 bf->bf_state.bfs_ndelim =
990 ath_compute_num_delims(sc, bf_first,
991 bf->bf_state.bfs_pktlen, (bf_first == bf));
994 * Calculate the padding needed from this set of delimiters,
995 * used when calculating if the next frame will fit in
998 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2);
1001 * Chain the buffers together
1004 bf_prev->bf_next = bf;
1008 * If we're leaking frames, just return at this point;
1009 * we've queued a single frame and we don't want to add
1012 if (tid->an->an_leak_count) {
1013 status = ATH_AGGR_LEAK_CLOSED;
1019 * terminate aggregation on a small packet boundary
1021 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) {
1022 status = ATH_AGGR_SHORTPKT;
1030 * Just in case the list was empty when we tried to
1031 * dequeue a packet ..
1034 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
1035 "%s: al=%d bytes; requested %d bytes\n",
1036 __func__, al, bf_first->bf_state.bfs_rc_maxpktlen);
1038 bf_first->bf_state.bfs_al = al;
1039 bf_first->bf_state.bfs_nframes = nframes;