1/* 2 * Copyright (c) 2010 Broadcom Corporation 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16#include <net/mac80211.h> 17 18#include "rate.h" 19#include "scb.h" 20#include "phy/phy_hal.h" 21#include "antsel.h" 22#include "main.h" 23#include "ampdu.h" 24#include "debug.h" 25#include "brcms_trace_events.h" 26 27/* max number of mpdus in an ampdu */ 28#define AMPDU_MAX_MPDU 32 29/* max number of mpdus in an ampdu to a legacy */ 30#define AMPDU_NUM_MPDU_LEGACY 16 31/* max Tx ba window size (in pdu) */ 32#define AMPDU_TX_BA_MAX_WSIZE 64 33/* default Tx ba window size (in pdu) */ 34#define AMPDU_TX_BA_DEF_WSIZE 64 35/* default Rx ba window size (in pdu) */ 36#define AMPDU_RX_BA_DEF_WSIZE 64 37/* max Rx ba window size (in pdu) */ 38#define AMPDU_RX_BA_MAX_WSIZE 64 39/* max dur of tx ampdu (in msec) */ 40#define AMPDU_MAX_DUR 5 41/* default tx retry limit */ 42#define AMPDU_DEF_RETRY_LIMIT 5 43/* default tx retry limit at reg rate */ 44#define AMPDU_DEF_RR_RETRY_LIMIT 2 45/* default ffpld reserved bytes */ 46#define AMPDU_DEF_FFPLD_RSVD 2048 47/* # of inis to be freed on detach */ 48#define AMPDU_INI_FREE 10 49/* max # of mpdus released at a time */ 50#define AMPDU_SCB_MAX_RELEASE 20 51 52#define NUM_FFPLD_FIFO 4 /* number of fifo concerned by pre-loading */ 53#define FFPLD_TX_MAX_UNFL 200 /* default value of the average number of ampdu 54 * without underflows 55 */ 56#define FFPLD_MPDU_SIZE 1800 /* estimate of maximum mpdu size */ 57#define FFPLD_MAX_MCS 23 /* we don't deal with mcs 32 */ 58#define FFPLD_PLD_INCR 1000 /* increments in bytes */ 59#define FFPLD_MAX_AMPDU_CNT 5000 /* maximum number of ampdu we 60 * accumulate between resets. 61 */ 62 63#define AMPDU_DELIMITER_LEN 4 64 65/* max allowed number of mpdus in an ampdu (2 streams) */ 66#define AMPDU_NUM_MPDU 16 67 68#define TX_SEQ_TO_INDEX(seq) ((seq) % AMPDU_TX_BA_MAX_WSIZE) 69 70/* max possible overhead per mpdu in the ampdu; 3 is for roundup if needed */ 71#define AMPDU_MAX_MPDU_OVERHEAD (FCS_LEN + DOT11_ICV_AES_LEN +\ 72 AMPDU_DELIMITER_LEN + 3\ 73 + DOT11_A4_HDR_LEN + DOT11_QOS_LEN + DOT11_IV_MAX_LEN) 74 75/* modulo add/sub, bound = 2^k */ 76#define MODADD_POW2(x, y, bound) (((x) + (y)) & ((bound) - 1)) 77#define MODSUB_POW2(x, y, bound) (((x) - (y)) & ((bound) - 1)) 78 79/* structure to hold tx fifo information and pre-loading state 80 * counters specific to tx underflows of ampdus 81 * some counters might be redundant with the ones in wlc or ampdu structures. 82 * This allows to maintain a specific state independently of 83 * how often and/or when the wlc counters are updated. 84 * 85 * ampdu_pld_size: number of bytes to be pre-loaded 86 * mcs2ampdu_table: per-mcs max # of mpdus in an ampdu 87 * prev_txfunfl: num of underflows last read from the HW macstats counter 88 * accum_txfunfl: num of underflows since we modified pld params 89 * accum_txampdu: num of tx ampdu since we modified pld params 90 * prev_txampdu: previous reading of tx ampdu 91 * dmaxferrate: estimated dma avg xfer rate in kbits/sec 92 */ 93struct brcms_fifo_info { 94 u16 ampdu_pld_size; 95 u8 mcs2ampdu_table[FFPLD_MAX_MCS + 1]; 96 u16 prev_txfunfl; 97 u32 accum_txfunfl; 98 u32 accum_txampdu; 99 u32 prev_txampdu; 100 u32 dmaxferrate; 101}; 102 103/* AMPDU module specific state 104 * 105 * wlc: pointer to main wlc structure 106 * scb_handle: scb cubby handle to retrieve data from scb 107 * ini_enable: per-tid initiator enable/disable of ampdu 108 * ba_tx_wsize: Tx ba window size (in pdu) 109 * ba_rx_wsize: Rx ba window size (in pdu) 110 * retry_limit: mpdu transmit retry limit 111 * rr_retry_limit: mpdu transmit retry limit at regular rate 112 * retry_limit_tid: per-tid mpdu transmit retry limit 113 * rr_retry_limit_tid: per-tid mpdu transmit retry limit at regular rate 114 * mpdu_density: min mpdu spacing (0-7) ==> 2^(x-1)/8 usec 115 * max_pdu: max pdus allowed in ampdu 116 * dur: max duration of an ampdu (in msec) 117 * rx_factor: maximum rx ampdu factor (0-3) ==> 2^(13+x) bytes 118 * ffpld_rsvd: number of bytes to reserve for preload 119 * max_txlen: max size of ampdu per mcs, bw and sgi 120 * mfbr: enable multiple fallback rate 121 * tx_max_funl: underflows should be kept such that 122 * (tx_max_funfl*underflows) < tx frames 123 * fifo_tb: table of fifo infos 124 */ 125struct ampdu_info { 126 struct brcms_c_info *wlc; 127 int scb_handle; 128 u8 ini_enable[AMPDU_MAX_SCB_TID]; 129 u8 ba_tx_wsize; 130 u8 ba_rx_wsize; 131 u8 retry_limit; 132 u8 rr_retry_limit; 133 u8 retry_limit_tid[AMPDU_MAX_SCB_TID]; 134 u8 rr_retry_limit_tid[AMPDU_MAX_SCB_TID]; 135 u8 mpdu_density; 136 s8 max_pdu; 137 u8 dur; 138 u8 rx_factor; 139 u32 ffpld_rsvd; 140 u32 max_txlen[MCS_TABLE_SIZE][2][2]; 141 bool mfbr; 142 u32 tx_max_funl; 143 struct brcms_fifo_info fifo_tb[NUM_FFPLD_FIFO]; 144}; 145 146/* used for flushing ampdu packets */ 147struct cb_del_ampdu_pars { 148 struct ieee80211_sta *sta; 149 u16 tid; 150}; 151 152static void brcms_c_scb_ampdu_update_max_txlen(struct ampdu_info *ampdu, u8 dur) 153{ 154 u32 rate, mcs; 155 156 for (mcs = 0; mcs < MCS_TABLE_SIZE; mcs++) { 157 /* rate is in Kbps; dur is in msec ==> len = (rate * dur) / 8 */ 158 /* 20MHz, No SGI */ 159 rate = mcs_2_rate(mcs, false, false); 160 ampdu->max_txlen[mcs][0][0] = (rate * dur) >> 3; 161 /* 40 MHz, No SGI */ 162 rate = mcs_2_rate(mcs, true, false); 163 ampdu->max_txlen[mcs][1][0] = (rate * dur) >> 3; 164 /* 20MHz, SGI */ 165 rate = mcs_2_rate(mcs, false, true); 166 ampdu->max_txlen[mcs][0][1] = (rate * dur) >> 3; 167 /* 40 MHz, SGI */ 168 rate = mcs_2_rate(mcs, true, true); 169 ampdu->max_txlen[mcs][1][1] = (rate * dur) >> 3; 170 } 171} 172 173static bool brcms_c_ampdu_cap(struct ampdu_info *ampdu) 174{ 175 if (BRCMS_PHY_11N_CAP(ampdu->wlc->band)) 176 return true; 177 else 178 return false; 179} 180 181static int brcms_c_ampdu_set(struct ampdu_info *ampdu, bool on) 182{ 183 struct brcms_c_info *wlc = ampdu->wlc; 184 struct bcma_device *core = wlc->hw->d11core; 185 186 wlc->pub->_ampdu = false; 187 188 if (on) { 189 if (!(wlc->pub->_n_enab & SUPPORT_11N)) { 190 brcms_err(core, "wl%d: driver not nmode enabled\n", 191 wlc->pub->unit); 192 return -ENOTSUPP; 193 } 194 if (!brcms_c_ampdu_cap(ampdu)) { 195 brcms_err(core, "wl%d: device not ampdu capable\n", 196 wlc->pub->unit); 197 return -ENOTSUPP; 198 } 199 wlc->pub->_ampdu = on; 200 } 201 202 return 0; 203} 204 205static void brcms_c_ffpld_init(struct ampdu_info *ampdu) 206{ 207 int i, j; 208 struct brcms_fifo_info *fifo; 209 210 for (j = 0; j < NUM_FFPLD_FIFO; j++) { 211 fifo = (ampdu->fifo_tb + j); 212 fifo->ampdu_pld_size = 0; 213 for (i = 0; i <= FFPLD_MAX_MCS; i++) 214 fifo->mcs2ampdu_table[i] = 255; 215 fifo->dmaxferrate = 0; 216 fifo->accum_txampdu = 0; 217 fifo->prev_txfunfl = 0; 218 fifo->accum_txfunfl = 0; 219 220 } 221} 222 223struct ampdu_info *brcms_c_ampdu_attach(struct brcms_c_info *wlc) 224{ 225 struct ampdu_info *ampdu; 226 int i; 227 228 ampdu = kzalloc(sizeof(struct ampdu_info), GFP_ATOMIC); 229 if (!ampdu) 230 return NULL; 231 232 ampdu->wlc = wlc; 233 234 for (i = 0; i < AMPDU_MAX_SCB_TID; i++) 235 ampdu->ini_enable[i] = true; 236 /* Disable ampdu for VO by default */ 237 ampdu->ini_enable[PRIO_8021D_VO] = false; 238 ampdu->ini_enable[PRIO_8021D_NC] = false; 239 240 /* Disable ampdu for BK by default since not enough fifo space */ 241 ampdu->ini_enable[PRIO_8021D_NONE] = false; 242 ampdu->ini_enable[PRIO_8021D_BK] = false; 243 244 ampdu->ba_tx_wsize = AMPDU_TX_BA_DEF_WSIZE; 245 ampdu->ba_rx_wsize = AMPDU_RX_BA_DEF_WSIZE; 246 ampdu->mpdu_density = AMPDU_DEF_MPDU_DENSITY; 247 ampdu->max_pdu = AUTO; 248 ampdu->dur = AMPDU_MAX_DUR; 249 250 ampdu->ffpld_rsvd = AMPDU_DEF_FFPLD_RSVD; 251 /* 252 * bump max ampdu rcv size to 64k for all 11n 253 * devices except 4321A0 and 4321A1 254 */ 255 if (BRCMS_ISNPHY(wlc->band) && NREV_LT(wlc->band->phyrev, 2)) 256 ampdu->rx_factor = IEEE80211_HT_MAX_AMPDU_32K; 257 else 258 ampdu->rx_factor = IEEE80211_HT_MAX_AMPDU_64K; 259 ampdu->retry_limit = AMPDU_DEF_RETRY_LIMIT; 260 ampdu->rr_retry_limit = AMPDU_DEF_RR_RETRY_LIMIT; 261 262 for (i = 0; i < AMPDU_MAX_SCB_TID; i++) { 263 ampdu->retry_limit_tid[i] = ampdu->retry_limit; 264 ampdu->rr_retry_limit_tid[i] = ampdu->rr_retry_limit; 265 } 266 267 brcms_c_scb_ampdu_update_max_txlen(ampdu, ampdu->dur); 268 ampdu->mfbr = false; 269 /* try to set ampdu to the default value */ 270 brcms_c_ampdu_set(ampdu, wlc->pub->_ampdu); 271 272 ampdu->tx_max_funl = FFPLD_TX_MAX_UNFL; 273 brcms_c_ffpld_init(ampdu); 274 275 return ampdu; 276} 277 278void brcms_c_ampdu_detach(struct ampdu_info *ampdu) 279{ 280 kfree(ampdu); 281} 282 283static void brcms_c_scb_ampdu_update_config(struct ampdu_info *ampdu, 284 struct scb *scb) 285{ 286 struct scb_ampdu *scb_ampdu = &scb->scb_ampdu; 287 int i; 288 289 scb_ampdu->max_pdu = AMPDU_NUM_MPDU; 290 291 /* go back to legacy size if some preloading is occurring */ 292 for (i = 0; i < NUM_FFPLD_FIFO; i++) { 293 if (ampdu->fifo_tb[i].ampdu_pld_size > FFPLD_PLD_INCR) 294 scb_ampdu->max_pdu = AMPDU_NUM_MPDU_LEGACY; 295 } 296 297 /* apply user override */ 298 if (ampdu->max_pdu != AUTO) 299 scb_ampdu->max_pdu = (u8) ampdu->max_pdu; 300 301 scb_ampdu->release = min_t(u8, scb_ampdu->max_pdu, 302 AMPDU_SCB_MAX_RELEASE); 303 304 if (scb_ampdu->max_rx_ampdu_bytes) 305 scb_ampdu->release = min_t(u8, scb_ampdu->release, 306 scb_ampdu->max_rx_ampdu_bytes / 1600); 307 308 scb_ampdu->release = min(scb_ampdu->release, 309 ampdu->fifo_tb[TX_AC_BE_FIFO]. 310 mcs2ampdu_table[FFPLD_MAX_MCS]); 311} 312 313static void brcms_c_scb_ampdu_update_config_all(struct ampdu_info *ampdu) 314{ 315 brcms_c_scb_ampdu_update_config(ampdu, &du->wlc->pri_scb); 316} 317 318static void brcms_c_ffpld_calc_mcs2ampdu_table(struct ampdu_info *ampdu, int f) 319{ 320 int i; 321 u32 phy_rate, dma_rate, tmp; 322 u8 max_mpdu; 323 struct brcms_fifo_info *fifo = (ampdu->fifo_tb + f); 324 325 /* recompute the dma rate */ 326 /* note : we divide/multiply by 100 to avoid integer overflows */ 327 max_mpdu = min_t(u8, fifo->mcs2ampdu_table[FFPLD_MAX_MCS], 328 AMPDU_NUM_MPDU_LEGACY); 329 phy_rate = mcs_2_rate(FFPLD_MAX_MCS, true, false); 330 dma_rate = 331 (((phy_rate / 100) * 332 (max_mpdu * FFPLD_MPDU_SIZE - fifo->ampdu_pld_size)) 333 / (max_mpdu * FFPLD_MPDU_SIZE)) * 100; 334 fifo->dmaxferrate = dma_rate; 335 336 /* fill up the mcs2ampdu table; do not recalc the last mcs */ 337 dma_rate = dma_rate >> 7; 338 for (i = 0; i < FFPLD_MAX_MCS; i++) { 339 /* shifting to keep it within integer range */ 340 phy_rate = mcs_2_rate(i, true, false) >> 7; 341 if (phy_rate > dma_rate) { 342 tmp = ((fifo->ampdu_pld_size * phy_rate) / 343 ((phy_rate - dma_rate) * FFPLD_MPDU_SIZE)) + 1; 344 tmp = min_t(u32, tmp, 255); 345 fifo->mcs2ampdu_table[i] = (u8) tmp; 346 } 347 } 348} 349 350/* evaluate the dma transfer rate using the tx underflows as feedback. 351 * If necessary, increase tx fifo preloading. If not enough, 352 * decrease maximum ampdu size for each mcs till underflows stop 353 * Return 1 if pre-loading not active, -1 if not an underflow event, 354 * 0 if pre-loading module took care of the event. 355 */ 356static int brcms_c_ffpld_check_txfunfl(struct brcms_c_info *wlc, int fid) 357{ 358 struct ampdu_info *ampdu = wlc->ampdu; 359 u32 phy_rate = mcs_2_rate(FFPLD_MAX_MCS, true, false); 360 u32 txunfl_ratio; 361 u8 max_mpdu; 362 u32 current_ampdu_cnt = 0; 363 u16 max_pld_size; 364 u32 new_txunfl; 365 struct brcms_fifo_info *fifo = (ampdu->fifo_tb + fid); 366 uint xmtfifo_sz; 367 u16 cur_txunfl; 368 369 /* return if we got here for a different reason than underflows */ 370 cur_txunfl = brcms_b_read_shm(wlc->hw, 371 M_UCODE_MACSTAT + 372 offsetof(struct macstat, txfunfl[fid])); 373 new_txunfl = (u16) (cur_txunfl - fifo->prev_txfunfl); 374 if (new_txunfl == 0) { 375 brcms_dbg_ht(wlc->hw->d11core, 376 "TX status FRAG set but no tx underflows\n"); 377 return -1; 378 } 379 fifo->prev_txfunfl = cur_txunfl; 380 381 if (!ampdu->tx_max_funl) 382 return 1; 383 384 /* check if fifo is big enough */ 385 if (brcms_b_xmtfifo_sz_get(wlc->hw, fid, &xmtfifo_sz)) 386 return -1; 387 388 if ((TXFIFO_SIZE_UNIT * (u32) xmtfifo_sz) <= ampdu->ffpld_rsvd) 389 return 1; 390 391 max_pld_size = TXFIFO_SIZE_UNIT * xmtfifo_sz - ampdu->ffpld_rsvd; 392 fifo->accum_txfunfl += new_txunfl; 393 394 /* we need to wait for at least 10 underflows */ 395 if (fifo->accum_txfunfl < 10) 396 return 0; 397 398 brcms_dbg_ht(wlc->hw->d11core, "ampdu_count %d tx_underflows %d\n", 399 current_ampdu_cnt, fifo->accum_txfunfl); 400 401 /* 402 compute the current ratio of tx unfl per ampdu. 403 When the current ampdu count becomes too 404 big while the ratio remains small, we reset 405 the current count in order to not 406 introduce too big of a latency in detecting a 407 large amount of tx underflows later. 408 */ 409 410 txunfl_ratio = current_ampdu_cnt / fifo->accum_txfunfl; 411 412 if (txunfl_ratio > ampdu->tx_max_funl) { 413 if (current_ampdu_cnt >= FFPLD_MAX_AMPDU_CNT) 414 fifo->accum_txfunfl = 0; 415 416 return 0; 417 } 418 max_mpdu = min_t(u8, fifo->mcs2ampdu_table[FFPLD_MAX_MCS], 419 AMPDU_NUM_MPDU_LEGACY); 420 421 /* In case max value max_pdu is already lower than 422 the fifo depth, there is nothing more we can do. 423 */ 424 425 if (fifo->ampdu_pld_size >= max_mpdu * FFPLD_MPDU_SIZE) { 426 fifo->accum_txfunfl = 0; 427 return 0; 428 } 429 430 if (fifo->ampdu_pld_size < max_pld_size) { 431 432 /* increment by TX_FIFO_PLD_INC bytes */ 433 fifo->ampdu_pld_size += FFPLD_PLD_INCR; 434 if (fifo->ampdu_pld_size > max_pld_size) 435 fifo->ampdu_pld_size = max_pld_size; 436 437 /* update scb release size */ 438 brcms_c_scb_ampdu_update_config_all(ampdu); 439 440 /* 441 * compute a new dma xfer rate for max_mpdu @ max mcs. 442 * This is the minimum dma rate that can achieve no 443 * underflow condition for the current mpdu size. 444 * 445 * note : we divide/multiply by 100 to avoid integer overflows 446 */ 447 fifo->dmaxferrate = 448 (((phy_rate / 100) * 449 (max_mpdu * FFPLD_MPDU_SIZE - fifo->ampdu_pld_size)) 450 / (max_mpdu * FFPLD_MPDU_SIZE)) * 100; 451 452 brcms_dbg_ht(wlc->hw->d11core, 453 "DMA estimated transfer rate %d; " 454 "pre-load size %d\n", 455 fifo->dmaxferrate, fifo->ampdu_pld_size); 456 } else { 457 458 /* decrease ampdu size */ 459 if (fifo->mcs2ampdu_table[FFPLD_MAX_MCS] > 1) { 460 if (fifo->mcs2ampdu_table[FFPLD_MAX_MCS] == 255) 461 fifo->mcs2ampdu_table[FFPLD_MAX_MCS] = 462 AMPDU_NUM_MPDU_LEGACY - 1; 463 else 464 fifo->mcs2ampdu_table[FFPLD_MAX_MCS] -= 1; 465 466 /* recompute the table */ 467 brcms_c_ffpld_calc_mcs2ampdu_table(ampdu, fid); 468 469 /* update scb release size */ 470 brcms_c_scb_ampdu_update_config_all(ampdu); 471 } 472 } 473 fifo->accum_txfunfl = 0; 474 return 0; 475} 476 477void 478brcms_c_ampdu_tx_operational(struct brcms_c_info *wlc, u8 tid, 479 uint max_rx_ampdu_bytes) /* from ht_cap in beacon */ 480{ 481 struct scb_ampdu *scb_ampdu; 482 struct ampdu_info *ampdu = wlc->ampdu; 483 struct scb *scb = &wlc->pri_scb; 484 scb_ampdu = &scb->scb_ampdu; 485 486 if (!ampdu->ini_enable[tid]) { 487 brcms_err(wlc->hw->d11core, "%s: Rejecting tid %d\n", 488 __func__, tid); 489 return; 490 } 491 492 scb_ampdu->max_rx_ampdu_bytes = max_rx_ampdu_bytes; 493} 494 495void brcms_c_ampdu_reset_session(struct brcms_ampdu_session *session, 496 struct brcms_c_info *wlc) 497{ 498 session->wlc = wlc; 499 skb_queue_head_init(&session->skb_list); 500 session->max_ampdu_len = 0; /* determined from first MPDU */ 501 session->max_ampdu_frames = 0; /* determined from first MPDU */ 502 session->ampdu_len = 0; 503 session->dma_len = 0; 504} 505 506/* 507 * Preps the given packet for AMPDU based on the session data. If the 508 * frame cannot be accomodated in the current session, -ENOSPC is 509 * returned. 510 */ 511int brcms_c_ampdu_add_frame(struct brcms_ampdu_session *session, 512 struct sk_buff *p) 513{ 514 struct brcms_c_info *wlc = session->wlc; 515 struct ampdu_info *ampdu = wlc->ampdu; 516 struct scb *scb = &wlc->pri_scb; 517 struct scb_ampdu *scb_ampdu = &scb->scb_ampdu; 518 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(p); 519 struct ieee80211_tx_rate *txrate = tx_info->status.rates; 520 struct d11txh *txh = (struct d11txh *)p->data; 521 unsigned ampdu_frames; 522 u8 ndelim, tid; 523 u8 *plcp; 524 uint len; 525 u16 mcl; 526 bool fbr_iscck; 527 bool rr; 528 529 ndelim = txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM]; 530 plcp = (u8 *)(txh + 1); 531 fbr_iscck = !(le16_to_cpu(txh->XtraFrameTypes) & 0x03); 532 len = fbr_iscck ? BRCMS_GET_CCK_PLCP_LEN(txh->FragPLCPFallback) : 533 BRCMS_GET_MIMO_PLCP_LEN(txh->FragPLCPFallback); 534 len = roundup(len, 4) + (ndelim + 1) * AMPDU_DELIMITER_LEN; 535 536 ampdu_frames = skb_queue_len(&session->skb_list); 537 if (ampdu_frames != 0) { 538 struct sk_buff *first; 539 540 if (ampdu_frames + 1 > session->max_ampdu_frames || 541 session->ampdu_len + len > session->max_ampdu_len) 542 return -ENOSPC; 543 544 /* 545 * We aren't really out of space if the new frame is of 546 * a different priority, but we want the same behaviour 547 * so return -ENOSPC anyway. 548 * 549 * XXX: The old AMPDU code did this, but is it really 550 * necessary? 551 */ 552 first = skb_peek(&session->skb_list); 553 if (p->priority != first->priority) 554 return -ENOSPC; 555 } 556 557 /* 558 * Now that we're sure this frame can be accomodated, update the 559 * session information. 560 */ 561 session->ampdu_len += len; 562 session->dma_len += p->len; 563 564 tid = (u8)p->priority; 565 566 /* Handle retry limits */ 567 if (txrate[0].count <= ampdu->rr_retry_limit_tid[tid]) { 568 txrate[0].count++; 569 rr = true; 570 } else { 571 txrate[1].count++; 572 rr = false; 573 } 574 575 if (ampdu_frames == 0) { 576 u8 plcp0, plcp3, is40, sgi, mcs; 577 uint fifo = le16_to_cpu(txh->TxFrameID) & TXFID_QUEUE_MASK; 578 struct brcms_fifo_info *f = &du->fifo_tb[fifo]; 579 580 if (rr) { 581 plcp0 = plcp[0]; 582 plcp3 = plcp[3]; 583 } else { 584 plcp0 = txh->FragPLCPFallback[0]; 585 plcp3 = txh->FragPLCPFallback[3]; 586 587 } 588 589 /* Limit AMPDU size based on MCS */ 590 is40 = (plcp0 & MIMO_PLCP_40MHZ) ? 1 : 0; 591 sgi = plcp3_issgi(plcp3) ? 1 : 0; 592 mcs = plcp0 & ~MIMO_PLCP_40MHZ; 593 session->max_ampdu_len = min(scb_ampdu->max_rx_ampdu_bytes, 594 ampdu->max_txlen[mcs][is40][sgi]); 595 596 session->max_ampdu_frames = scb_ampdu->max_pdu; 597 if (mcs_2_rate(mcs, true, false) >= f->dmaxferrate) { 598 session->max_ampdu_frames = 599 min_t(u16, f->mcs2ampdu_table[mcs], 600 session->max_ampdu_frames); 601 } 602 } 603 604 /* 605 * Treat all frames as "middle" frames of AMPDU here. First and 606 * last frames must be fixed up after all MPDUs have been prepped. 607 */ 608 mcl = le16_to_cpu(txh->MacTxControlLow); 609 mcl &= ~TXC_AMPDU_MASK; 610 mcl |= (TXC_AMPDU_MIDDLE << TXC_AMPDU_SHIFT); 611 mcl &= ~(TXC_STARTMSDU | TXC_SENDRTS | TXC_SENDCTS); 612 txh->MacTxControlLow = cpu_to_le16(mcl); 613 txh->PreloadSize = 0; /* always default to 0 */ 614 615 skb_queue_tail(&session->skb_list, p); 616 617 return 0; 618} 619 620void brcms_c_ampdu_finalize(struct brcms_ampdu_session *session) 621{ 622 struct brcms_c_info *wlc = session->wlc; 623 struct ampdu_info *ampdu = wlc->ampdu; 624 struct sk_buff *first, *last; 625 struct d11txh *txh; 626 struct ieee80211_tx_info *tx_info; 627 struct ieee80211_tx_rate *txrate; 628 u8 ndelim; 629 u8 *plcp; 630 uint len; 631 uint fifo; 632 struct brcms_fifo_info *f; 633 u16 mcl; 634 bool fbr; 635 bool fbr_iscck; 636 struct ieee80211_rts *rts; 637 bool use_rts = false, use_cts = false; 638 u16 dma_len = session->dma_len; 639 u16 mimo_ctlchbw = PHY_TXC1_BW_20MHZ; 640 u32 rspec = 0, rspec_fallback = 0; 641 u32 rts_rspec = 0, rts_rspec_fallback = 0; 642 u8 plcp0, is40, mcs; 643 u16 mch; 644 u8 preamble_type = BRCMS_GF_PREAMBLE; 645 u8 fbr_preamble_type = BRCMS_GF_PREAMBLE; 646 u8 rts_preamble_type = BRCMS_LONG_PREAMBLE; 647 u8 rts_fbr_preamble_type = BRCMS_LONG_PREAMBLE; 648 649 if (skb_queue_empty(&session->skb_list)) 650 return; 651 652 first = skb_peek(&session->skb_list); 653 last = skb_peek_tail(&session->skb_list); 654 655 /* Need to fix up last MPDU first to adjust AMPDU length */ 656 txh = (struct d11txh *)last->data; 657 fifo = le16_to_cpu(txh->TxFrameID) & TXFID_QUEUE_MASK; 658 f = &du->fifo_tb[fifo]; 659 660 mcl = le16_to_cpu(txh->MacTxControlLow); 661 mcl &= ~TXC_AMPDU_MASK; 662 mcl |= (TXC_AMPDU_LAST << TXC_AMPDU_SHIFT); 663 txh->MacTxControlLow = cpu_to_le16(mcl); 664 665 /* remove the null delimiter after last mpdu */ 666 ndelim = txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM]; 667 txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM] = 0; 668 session->ampdu_len -= ndelim * AMPDU_DELIMITER_LEN; 669 670 /* remove the pad len from last mpdu */ 671 fbr_iscck = ((le16_to_cpu(txh->XtraFrameTypes) & 0x3) == 0); 672 len = fbr_iscck ? BRCMS_GET_CCK_PLCP_LEN(txh->FragPLCPFallback) : 673 BRCMS_GET_MIMO_PLCP_LEN(txh->FragPLCPFallback); 674 session->ampdu_len -= roundup(len, 4) - len; 675 676 /* Now fix up the first MPDU */ 677 tx_info = IEEE80211_SKB_CB(first); 678 txrate = tx_info->status.rates; 679 txh = (struct d11txh *)first->data; 680 plcp = (u8 *)(txh + 1); 681 rts = (struct ieee80211_rts *)&txh->rts_frame; 682 683 mcl = le16_to_cpu(txh->MacTxControlLow); 684 /* If only one MPDU leave it marked as last */ 685 if (first != last) { 686 mcl &= ~TXC_AMPDU_MASK; 687 mcl |= (TXC_AMPDU_FIRST << TXC_AMPDU_SHIFT); 688 } 689 mcl |= TXC_STARTMSDU; 690 if (ieee80211_is_rts(rts->frame_control)) { 691 mcl |= TXC_SENDRTS; 692 use_rts = true; 693 } 694 if (ieee80211_is_cts(rts->frame_control)) { 695 mcl |= TXC_SENDCTS; 696 use_cts = true; 697 } 698 txh->MacTxControlLow = cpu_to_le16(mcl); 699 700 fbr = txrate[1].count > 0; 701 if (!fbr) 702 plcp0 = plcp[0]; 703 else 704 plcp0 = txh->FragPLCPFallback[0]; 705 706 is40 = (plcp0 & MIMO_PLCP_40MHZ) ? 1 : 0; 707 mcs = plcp0 & ~MIMO_PLCP_40MHZ; 708 709 if (is40) { 710 if (CHSPEC_SB_UPPER(wlc_phy_chanspec_get(wlc->band->pi))) 711 mimo_ctlchbw = PHY_TXC1_BW_20MHZ_UP; 712 else 713 mimo_ctlchbw = PHY_TXC1_BW_20MHZ; 714 } 715 716 /* rebuild the rspec and rspec_fallback */ 717 rspec = RSPEC_MIMORATE; 718 rspec |= plcp[0] & ~MIMO_PLCP_40MHZ; 719 if (plcp[0] & MIMO_PLCP_40MHZ) 720 rspec |= (PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT); 721 722 fbr_iscck = !(le16_to_cpu(txh->XtraFrameTypes) & 0x03); 723 if (fbr_iscck) { 724 rspec_fallback = 725 cck_rspec(cck_phy2mac_rate(txh->FragPLCPFallback[0])); 726 } else { 727 rspec_fallback = RSPEC_MIMORATE; 728 rspec_fallback |= txh->FragPLCPFallback[0] & ~MIMO_PLCP_40MHZ; 729 if (txh->FragPLCPFallback[0] & MIMO_PLCP_40MHZ) 730 rspec_fallback |= PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT; 731 } 732 733 if (use_rts || use_cts) { 734 rts_rspec = 735 brcms_c_rspec_to_rts_rspec(wlc, rspec, 736 false, mimo_ctlchbw); 737 rts_rspec_fallback = 738 brcms_c_rspec_to_rts_rspec(wlc, rspec_fallback, 739 false, mimo_ctlchbw); 740 } 741 742 BRCMS_SET_MIMO_PLCP_LEN(plcp, session->ampdu_len); 743 /* mark plcp to indicate ampdu */ 744 BRCMS_SET_MIMO_PLCP_AMPDU(plcp); 745 746 /* reset the mixed mode header durations */ 747 if (txh->MModeLen) { 748 u16 mmodelen = brcms_c_calc_lsig_len(wlc, rspec, 749 session->ampdu_len); 750 txh->MModeLen = cpu_to_le16(mmodelen); 751 preamble_type = BRCMS_MM_PREAMBLE; 752 } 753 if (txh->MModeFbrLen) { 754 u16 mmfbrlen = brcms_c_calc_lsig_len(wlc, rspec_fallback, 755 session->ampdu_len); 756 txh->MModeFbrLen = cpu_to_le16(mmfbrlen); 757 fbr_preamble_type = BRCMS_MM_PREAMBLE; 758 } 759 760 /* set the preload length */ 761 if (mcs_2_rate(mcs, true, false) >= f->dmaxferrate) { 762 dma_len = min(dma_len, f->ampdu_pld_size); 763 txh->PreloadSize = cpu_to_le16(dma_len); 764 } else { 765 txh->PreloadSize = 0; 766 } 767 768 mch = le16_to_cpu(txh->MacTxControlHigh); 769 770 /* update RTS dur fields */ 771 if (use_rts || use_cts) { 772 u16 durid; 773 if ((mch & TXC_PREAMBLE_RTS_MAIN_SHORT) == 774 TXC_PREAMBLE_RTS_MAIN_SHORT) 775 rts_preamble_type = BRCMS_SHORT_PREAMBLE; 776 777 if ((mch & TXC_PREAMBLE_RTS_FB_SHORT) == 778 TXC_PREAMBLE_RTS_FB_SHORT) 779 rts_fbr_preamble_type = BRCMS_SHORT_PREAMBLE; 780 781 durid = brcms_c_compute_rtscts_dur(wlc, use_cts, rts_rspec, 782 rspec, rts_preamble_type, 783 preamble_type, 784 session->ampdu_len, true); 785 rts->duration = cpu_to_le16(durid); 786 durid = brcms_c_compute_rtscts_dur(wlc, use_cts, 787 rts_rspec_fallback, 788 rspec_fallback, 789 rts_fbr_preamble_type, 790 fbr_preamble_type, 791 session->ampdu_len, true); 792 txh->RTSDurFallback = cpu_to_le16(durid); 793 /* set TxFesTimeNormal */ 794 txh->TxFesTimeNormal = rts->duration; 795 /* set fallback rate version of TxFesTimeNormal */ 796 txh->TxFesTimeFallback = txh->RTSDurFallback; 797 } 798 799 /* set flag and plcp for fallback rate */ 800 if (fbr) { 801 mch |= TXC_AMPDU_FBR; 802 txh->MacTxControlHigh = cpu_to_le16(mch); 803 BRCMS_SET_MIMO_PLCP_AMPDU(plcp); 804 BRCMS_SET_MIMO_PLCP_AMPDU(txh->FragPLCPFallback); 805 } 806 807 brcms_dbg_ht(wlc->hw->d11core, "wl%d: count %d ampdu_len %d\n", 808 wlc->pub->unit, skb_queue_len(&session->skb_list), 809 session->ampdu_len); 810} 811 812static void 813brcms_c_ampdu_rate_status(struct brcms_c_info *wlc, 814 struct ieee80211_tx_info *tx_info, 815 struct tx_status *txs, u8 mcs) 816{ 817 struct ieee80211_tx_rate *txrate = tx_info->status.rates; 818 int i; 819 820 /* clear the rest of the rates */ 821 for (i = 2; i < IEEE80211_TX_MAX_RATES; i++) { 822 txrate[i].idx = -1; 823 txrate[i].count = 0; 824 } 825} 826 827static void 828brcms_c_ampdu_dotxstatus_complete(struct ampdu_info *ampdu, struct scb *scb, 829 struct sk_buff *p, struct tx_status *txs, 830 u32 s1, u32 s2) 831{ 832 struct scb_ampdu *scb_ampdu; 833 struct brcms_c_info *wlc = ampdu->wlc; 834 struct scb_ampdu_tid_ini *ini; 835 u8 bitmap[8], queue, tid; 836 struct d11txh *txh; 837 u8 *plcp; 838 struct ieee80211_hdr *h; 839 u16 seq, start_seq = 0, bindex, index, mcl; 840 u8 mcs = 0; 841 bool ba_recd = false, ack_recd = false; 842 u8 tot_mpdu = 0; 843 uint supr_status; 844 bool retry = true; 845 u16 mimoantsel = 0; 846 u8 retry_limit; 847 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(p); 848 849#ifdef DEBUG 850 u8 hole[AMPDU_MAX_MPDU]; 851 memset(hole, 0, sizeof(hole)); 852#endif 853 854 scb_ampdu = &scb->scb_ampdu; 855 tid = (u8) (p->priority); 856 857 ini = &scb_ampdu->ini[tid]; 858 retry_limit = ampdu->retry_limit_tid[tid]; 859 memset(bitmap, 0, sizeof(bitmap)); 860 queue = txs->frameid & TXFID_QUEUE_MASK; 861 supr_status = txs->status & TX_STATUS_SUPR_MASK; 862 863 if (txs->status & TX_STATUS_ACK_RCV) { 864 WARN_ON(!(txs->status & TX_STATUS_INTERMEDIATE)); 865 start_seq = txs->sequence >> SEQNUM_SHIFT; 866 bitmap[0] = (txs->status & TX_STATUS_BA_BMAP03_MASK) >> 867 TX_STATUS_BA_BMAP03_SHIFT; 868 869 WARN_ON(s1 & TX_STATUS_INTERMEDIATE); 870 WARN_ON(!(s1 & TX_STATUS_AMPDU)); 871 872 bitmap[0] |= 873 (s1 & TX_STATUS_BA_BMAP47_MASK) << 874 TX_STATUS_BA_BMAP47_SHIFT; 875 bitmap[1] = (s1 >> 8) & 0xff; 876 bitmap[2] = (s1 >> 16) & 0xff; 877 bitmap[3] = (s1 >> 24) & 0xff; 878 879 bitmap[4] = s2 & 0xff; 880 bitmap[5] = (s2 >> 8) & 0xff; 881 bitmap[6] = (s2 >> 16) & 0xff; 882 bitmap[7] = (s2 >> 24) & 0xff; 883 884 ba_recd = true; 885 } else { 886 if (supr_status) { 887 if (supr_status == TX_STATUS_SUPR_BADCH) { 888 brcms_dbg_ht(wlc->hw->d11core, 889 "%s: Pkt tx suppressed, illegal channel possibly %d\n", 890 __func__, CHSPEC_CHANNEL( 891 wlc->default_bss->chanspec)); 892 } else { 893 if (supr_status != TX_STATUS_SUPR_FRAG) 894 brcms_err(wlc->hw->d11core, 895 "%s: supr_status 0x%x\n", 896 __func__, supr_status); 897 } 898 /* no need to retry for badch; will fail again */ 899 if (supr_status == TX_STATUS_SUPR_BADCH || 900 supr_status == TX_STATUS_SUPR_EXPTIME) { 901 retry = false; 902 } else if (supr_status == TX_STATUS_SUPR_EXPTIME) { 903 /* TX underflow: 904 * try tuning pre-loading or ampdu size 905 */ 906 } else if (supr_status == TX_STATUS_SUPR_FRAG) { 907 /* 908 * if there were underflows, but pre-loading 909 * is not active, notify rate adaptation. 910 */ 911 brcms_c_ffpld_check_txfunfl(wlc, queue); 912 } 913 } else if (txs->phyerr) { 914 brcms_dbg_ht(wlc->hw->d11core, 915 "%s: ampdu tx phy error (0x%x)\n", 916 __func__, txs->phyerr); 917 } 918 } 919 920 /* loop through all pkts and retry if not acked */ 921 while (p) { 922 tx_info = IEEE80211_SKB_CB(p); 923 txh = (struct d11txh *) p->data; 924 mcl = le16_to_cpu(txh->MacTxControlLow); 925 plcp = (u8 *) (txh + 1); 926 h = (struct ieee80211_hdr *)(plcp + D11_PHY_HDR_LEN); 927 seq = le16_to_cpu(h->seq_ctrl) >> SEQNUM_SHIFT; 928 929 trace_brcms_txdesc(&wlc->hw->d11core->dev, txh, sizeof(*txh)); 930 931 if (tot_mpdu == 0) { 932 mcs = plcp[0] & MIMO_PLCP_MCS_MASK; 933 mimoantsel = le16_to_cpu(txh->ABI_MimoAntSel); 934 } 935 936 index = TX_SEQ_TO_INDEX(seq); 937 ack_recd = false; 938 if (ba_recd) { 939 int block_acked; 940 941 bindex = MODSUB_POW2(seq, start_seq, SEQNUM_MAX); 942 if (bindex < AMPDU_TX_BA_MAX_WSIZE) 943 block_acked = isset(bitmap, bindex); 944 else 945 block_acked = 0; 946 brcms_dbg_ht(wlc->hw->d11core, 947 "tid %d seq %d, start_seq %d, bindex %d set %d, index %d\n", 948 tid, seq, start_seq, bindex, 949 block_acked, index); 950 /* if acked then clear bit and free packet */ 951 if (block_acked) { 952 ini->txretry[index] = 0; 953 954 /* 955 * ampdu_ack_len: 956 * number of acked aggregated frames 957 */ 958 /* ampdu_len: number of aggregated frames */ 959 brcms_c_ampdu_rate_status(wlc, tx_info, txs, 960 mcs); 961 tx_info->flags |= IEEE80211_TX_STAT_ACK; 962 tx_info->flags |= IEEE80211_TX_STAT_AMPDU; 963 tx_info->status.ampdu_ack_len = 964 tx_info->status.ampdu_len = 1; 965 966 skb_pull(p, D11_PHY_HDR_LEN); 967 skb_pull(p, D11_TXH_LEN); 968 969 ieee80211_tx_status_irqsafe(wlc->pub->ieee_hw, 970 p); 971 ack_recd = true; 972 } 973 } 974 /* either retransmit or send bar if ack not recd */ 975 if (!ack_recd) { 976 if (retry && (ini->txretry[index] < (int)retry_limit)) { 977 int ret; 978 ini->txretry[index]++; 979 ret = brcms_c_txfifo(wlc, queue, p); 980 /* 981 * We shouldn't be out of space in the DMA 982 * ring here since we're reinserting a frame 983 * that was just pulled out. 984 */ 985 WARN_ONCE(ret, "queue %d out of txds\n", queue); 986 } else { 987 /* Retry timeout */ 988 ieee80211_tx_info_clear_status(tx_info); 989 tx_info->status.ampdu_ack_len = 0; 990 tx_info->status.ampdu_len = 1; 991 tx_info->flags |= 992 IEEE80211_TX_STAT_AMPDU_NO_BACK; 993 skb_pull(p, D11_PHY_HDR_LEN); 994 skb_pull(p, D11_TXH_LEN); 995 brcms_dbg_ht(wlc->hw->d11core, 996 "BA Timeout, seq %d\n", 997 seq); 998 ieee80211_tx_status_irqsafe(wlc->pub->ieee_hw, 999 p); 1000 } 1001 } 1002 tot_mpdu++; 1003 1004 /* break out if last packet of ampdu */ 1005 if (((mcl & TXC_AMPDU_MASK) >> TXC_AMPDU_SHIFT) == 1006 TXC_AMPDU_LAST) 1007 break; 1008 1009 p = dma_getnexttxp(wlc->hw->di[queue], DMA_RANGE_TRANSMITTED); 1010 } 1011 1012 /* update rate state */ 1013 brcms_c_antsel_antsel2id(wlc->asi, mimoantsel); 1014} 1015 1016void 1017brcms_c_ampdu_dotxstatus(struct ampdu_info *ampdu, struct scb *scb, 1018 struct sk_buff *p, struct tx_status *txs) 1019{ 1020 struct brcms_c_info *wlc = ampdu->wlc; 1021 u32 s1 = 0, s2 = 0; 1022 1023 /* BMAC_NOTE: For the split driver, second level txstatus comes later 1024 * So if the ACK was received then wait for the second level else just 1025 * call the first one 1026 */ 1027 if (txs->status & TX_STATUS_ACK_RCV) { 1028 u8 status_delay = 0; 1029 1030 /* wait till the next 8 bytes of txstatus is available */ 1031 s1 = bcma_read32(wlc->hw->d11core, D11REGOFFS(frmtxstatus)); 1032 while ((s1 & TXS_V) == 0) { 1033 udelay(1); 1034 status_delay++; 1035 if (status_delay > 10) 1036 return; /* error condition */ 1037 s1 = bcma_read32(wlc->hw->d11core, 1038 D11REGOFFS(frmtxstatus)); 1039 } 1040 1041 s2 = bcma_read32(wlc->hw->d11core, D11REGOFFS(frmtxstatus2)); 1042 } 1043 1044 if (scb) { 1045 brcms_c_ampdu_dotxstatus_complete(ampdu, scb, p, txs, s1, s2); 1046 } else { 1047 /* loop through all pkts and free */ 1048 u8 queue = txs->frameid & TXFID_QUEUE_MASK; 1049 struct d11txh *txh; 1050 u16 mcl; 1051 while (p) { 1052 txh = (struct d11txh *) p->data; 1053 trace_brcms_txdesc(&wlc->hw->d11core->dev, txh, 1054 sizeof(*txh)); 1055 mcl = le16_to_cpu(txh->MacTxControlLow); 1056 brcmu_pkt_buf_free_skb(p); 1057 /* break out if last packet of ampdu */ 1058 if (((mcl & TXC_AMPDU_MASK) >> TXC_AMPDU_SHIFT) == 1059 TXC_AMPDU_LAST) 1060 break; 1061 p = dma_getnexttxp(wlc->hw->di[queue], 1062 DMA_RANGE_TRANSMITTED); 1063 } 1064 } 1065} 1066 1067void brcms_c_ampdu_macaddr_upd(struct brcms_c_info *wlc) 1068{ 1069 char template[T_RAM_ACCESS_SZ * 2]; 1070 1071 /* driver needs to write the ta in the template; ta is at offset 16 */ 1072 memset(template, 0, sizeof(template)); 1073 memcpy(template, wlc->pub->cur_etheraddr, ETH_ALEN); 1074 brcms_b_write_template_ram(wlc->hw, (T_BA_TPL_BASE + 16), 1075 (T_RAM_ACCESS_SZ * 2), 1076 template); 1077} 1078 1079bool brcms_c_aggregatable(struct brcms_c_info *wlc, u8 tid) 1080{ 1081 return wlc->ampdu->ini_enable[tid]; 1082} 1083 1084void brcms_c_ampdu_shm_upd(struct ampdu_info *ampdu) 1085{ 1086 struct brcms_c_info *wlc = ampdu->wlc; 1087 1088 /* 1089 * Extend ucode internal watchdog timer to 1090 * match larger received frames 1091 */ 1092 if ((ampdu->rx_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) == 1093 IEEE80211_HT_MAX_AMPDU_64K) { 1094 brcms_b_write_shm(wlc->hw, M_MIMO_MAXSYM, MIMO_MAXSYM_MAX); 1095 brcms_b_write_shm(wlc->hw, M_WATCHDOG_8TU, WATCHDOG_8TU_MAX); 1096 } else { 1097 brcms_b_write_shm(wlc->hw, M_MIMO_MAXSYM, MIMO_MAXSYM_DEF); 1098 brcms_b_write_shm(wlc->hw, M_WATCHDOG_8TU, WATCHDOG_8TU_DEF); 1099 } 1100} 1101 1102/* 1103 * callback function that helps invalidating ampdu packets in a DMA queue 1104 */ 1105static void dma_cb_fn_ampdu(void *txi, void *arg_a) 1106{ 1107 struct ieee80211_sta *sta = arg_a; 1108 struct ieee80211_tx_info *tx_info = (struct ieee80211_tx_info *)txi; 1109 1110 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && 1111 (tx_info->rate_driver_data[0] == sta || sta == NULL)) 1112 tx_info->rate_driver_data[0] = NULL; 1113} 1114 1115/* 1116 * When a remote party is no longer available for ampdu communication, any 1117 * pending tx ampdu packets in the driver have to be flushed. 1118 */ 1119void brcms_c_ampdu_flush(struct brcms_c_info *wlc, 1120 struct ieee80211_sta *sta, u16 tid) 1121{ 1122 brcms_c_inval_dma_pkts(wlc->hw, sta, dma_cb_fn_ampdu); 1123} 1124