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 u8 ba_wsize, /* negotiated ba window size (in pdu) */ 480 uint max_rx_ampdu_bytes) /* from ht_cap in beacon */ 481{ 482 struct scb_ampdu *scb_ampdu; 483 struct scb_ampdu_tid_ini *ini; 484 struct ampdu_info *ampdu = wlc->ampdu; 485 struct scb *scb = &wlc->pri_scb; 486 scb_ampdu = &scb->scb_ampdu; 487 488 if (!ampdu->ini_enable[tid]) { 489 brcms_err(wlc->hw->d11core, "%s: Rejecting tid %d\n", 490 __func__, tid); 491 return; 492 } 493 494 ini = &scb_ampdu->ini[tid]; 495 ini->tid = tid; 496 ini->scb = scb_ampdu->scb; 497 ini->ba_wsize = ba_wsize; 498 scb_ampdu->max_rx_ampdu_bytes = max_rx_ampdu_bytes; 499} 500 501void brcms_c_ampdu_reset_session(struct brcms_ampdu_session *session, 502 struct brcms_c_info *wlc) 503{ 504 session->wlc = wlc; 505 skb_queue_head_init(&session->skb_list); 506 session->max_ampdu_len = 0; /* determined from first MPDU */ 507 session->max_ampdu_frames = 0; /* determined from first MPDU */ 508 session->ampdu_len = 0; 509 session->dma_len = 0; 510} 511 512/* 513 * Preps the given packet for AMPDU based on the session data. If the 514 * frame cannot be accomodated in the current session, -ENOSPC is 515 * returned. 516 */ 517int brcms_c_ampdu_add_frame(struct brcms_ampdu_session *session, 518 struct sk_buff *p) 519{ 520 struct brcms_c_info *wlc = session->wlc; 521 struct ampdu_info *ampdu = wlc->ampdu; 522 struct scb *scb = &wlc->pri_scb; 523 struct scb_ampdu *scb_ampdu = &scb->scb_ampdu; 524 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(p); 525 struct ieee80211_tx_rate *txrate = tx_info->status.rates; 526 struct d11txh *txh = (struct d11txh *)p->data; 527 unsigned ampdu_frames; 528 u8 ndelim, tid; 529 u8 *plcp; 530 uint len; 531 u16 mcl; 532 bool fbr_iscck; 533 bool rr; 534 535 ndelim = txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM]; 536 plcp = (u8 *)(txh + 1); 537 fbr_iscck = !(le16_to_cpu(txh->XtraFrameTypes) & 0x03); 538 len = fbr_iscck ? BRCMS_GET_CCK_PLCP_LEN(txh->FragPLCPFallback) : 539 BRCMS_GET_MIMO_PLCP_LEN(txh->FragPLCPFallback); 540 len = roundup(len, 4) + (ndelim + 1) * AMPDU_DELIMITER_LEN; 541 542 ampdu_frames = skb_queue_len(&session->skb_list); 543 if (ampdu_frames != 0) { 544 struct sk_buff *first; 545 546 if (ampdu_frames + 1 > session->max_ampdu_frames || 547 session->ampdu_len + len > session->max_ampdu_len) 548 return -ENOSPC; 549 550 /* 551 * We aren't really out of space if the new frame is of 552 * a different priority, but we want the same behaviour 553 * so return -ENOSPC anyway. 554 * 555 * XXX: The old AMPDU code did this, but is it really 556 * necessary? 557 */ 558 first = skb_peek(&session->skb_list); 559 if (p->priority != first->priority) 560 return -ENOSPC; 561 } 562 563 /* 564 * Now that we're sure this frame can be accomodated, update the 565 * session information. 566 */ 567 session->ampdu_len += len; 568 session->dma_len += p->len; 569 570 tid = (u8)p->priority; 571 572 /* Handle retry limits */ 573 if (txrate[0].count <= ampdu->rr_retry_limit_tid[tid]) { 574 txrate[0].count++; 575 rr = true; 576 } else { 577 txrate[1].count++; 578 rr = false; 579 } 580 581 if (ampdu_frames == 0) { 582 u8 plcp0, plcp3, is40, sgi, mcs; 583 uint fifo = le16_to_cpu(txh->TxFrameID) & TXFID_QUEUE_MASK; 584 struct brcms_fifo_info *f = &du->fifo_tb[fifo]; 585 586 if (rr) { 587 plcp0 = plcp[0]; 588 plcp3 = plcp[3]; 589 } else { 590 plcp0 = txh->FragPLCPFallback[0]; 591 plcp3 = txh->FragPLCPFallback[3]; 592 593 } 594 595 /* Limit AMPDU size based on MCS */ 596 is40 = (plcp0 & MIMO_PLCP_40MHZ) ? 1 : 0; 597 sgi = plcp3_issgi(plcp3) ? 1 : 0; 598 mcs = plcp0 & ~MIMO_PLCP_40MHZ; 599 session->max_ampdu_len = min(scb_ampdu->max_rx_ampdu_bytes, 600 ampdu->max_txlen[mcs][is40][sgi]); 601 602 session->max_ampdu_frames = scb_ampdu->max_pdu; 603 if (mcs_2_rate(mcs, true, false) >= f->dmaxferrate) { 604 session->max_ampdu_frames = 605 min_t(u16, f->mcs2ampdu_table[mcs], 606 session->max_ampdu_frames); 607 } 608 } 609 610 /* 611 * Treat all frames as "middle" frames of AMPDU here. First and 612 * last frames must be fixed up after all MPDUs have been prepped. 613 */ 614 mcl = le16_to_cpu(txh->MacTxControlLow); 615 mcl &= ~TXC_AMPDU_MASK; 616 mcl |= (TXC_AMPDU_MIDDLE << TXC_AMPDU_SHIFT); 617 mcl &= ~(TXC_STARTMSDU | TXC_SENDRTS | TXC_SENDCTS); 618 txh->MacTxControlLow = cpu_to_le16(mcl); 619 txh->PreloadSize = 0; /* always default to 0 */ 620 621 skb_queue_tail(&session->skb_list, p); 622 623 return 0; 624} 625 626void brcms_c_ampdu_finalize(struct brcms_ampdu_session *session) 627{ 628 struct brcms_c_info *wlc = session->wlc; 629 struct ampdu_info *ampdu = wlc->ampdu; 630 struct sk_buff *first, *last; 631 struct d11txh *txh; 632 struct ieee80211_tx_info *tx_info; 633 struct ieee80211_tx_rate *txrate; 634 u8 ndelim; 635 u8 *plcp; 636 uint len; 637 uint fifo; 638 struct brcms_fifo_info *f; 639 u16 mcl; 640 bool fbr; 641 bool fbr_iscck; 642 struct ieee80211_rts *rts; 643 bool use_rts = false, use_cts = false; 644 u16 dma_len = session->dma_len; 645 u16 mimo_ctlchbw = PHY_TXC1_BW_20MHZ; 646 u32 rspec = 0, rspec_fallback = 0; 647 u32 rts_rspec = 0, rts_rspec_fallback = 0; 648 u8 plcp0, is40, mcs; 649 u16 mch; 650 u8 preamble_type = BRCMS_GF_PREAMBLE; 651 u8 fbr_preamble_type = BRCMS_GF_PREAMBLE; 652 u8 rts_preamble_type = BRCMS_LONG_PREAMBLE; 653 u8 rts_fbr_preamble_type = BRCMS_LONG_PREAMBLE; 654 655 if (skb_queue_empty(&session->skb_list)) 656 return; 657 658 first = skb_peek(&session->skb_list); 659 last = skb_peek_tail(&session->skb_list); 660 661 /* Need to fix up last MPDU first to adjust AMPDU length */ 662 txh = (struct d11txh *)last->data; 663 fifo = le16_to_cpu(txh->TxFrameID) & TXFID_QUEUE_MASK; 664 f = &du->fifo_tb[fifo]; 665 666 mcl = le16_to_cpu(txh->MacTxControlLow); 667 mcl &= ~TXC_AMPDU_MASK; 668 mcl |= (TXC_AMPDU_LAST << TXC_AMPDU_SHIFT); 669 txh->MacTxControlLow = cpu_to_le16(mcl); 670 671 /* remove the null delimiter after last mpdu */ 672 ndelim = txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM]; 673 txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM] = 0; 674 session->ampdu_len -= ndelim * AMPDU_DELIMITER_LEN; 675 676 /* remove the pad len from last mpdu */ 677 fbr_iscck = ((le16_to_cpu(txh->XtraFrameTypes) & 0x3) == 0); 678 len = fbr_iscck ? BRCMS_GET_CCK_PLCP_LEN(txh->FragPLCPFallback) : 679 BRCMS_GET_MIMO_PLCP_LEN(txh->FragPLCPFallback); 680 session->ampdu_len -= roundup(len, 4) - len; 681 682 /* Now fix up the first MPDU */ 683 tx_info = IEEE80211_SKB_CB(first); 684 txrate = tx_info->status.rates; 685 txh = (struct d11txh *)first->data; 686 plcp = (u8 *)(txh + 1); 687 rts = (struct ieee80211_rts *)&txh->rts_frame; 688 689 mcl = le16_to_cpu(txh->MacTxControlLow); 690 /* If only one MPDU leave it marked as last */ 691 if (first != last) { 692 mcl &= ~TXC_AMPDU_MASK; 693 mcl |= (TXC_AMPDU_FIRST << TXC_AMPDU_SHIFT); 694 } 695 mcl |= TXC_STARTMSDU; 696 if (ieee80211_is_rts(rts->frame_control)) { 697 mcl |= TXC_SENDRTS; 698 use_rts = true; 699 } 700 if (ieee80211_is_cts(rts->frame_control)) { 701 mcl |= TXC_SENDCTS; 702 use_cts = true; 703 } 704 txh->MacTxControlLow = cpu_to_le16(mcl); 705 706 fbr = txrate[1].count > 0; 707 if (!fbr) 708 plcp0 = plcp[0]; 709 else 710 plcp0 = txh->FragPLCPFallback[0]; 711 712 is40 = (plcp0 & MIMO_PLCP_40MHZ) ? 1 : 0; 713 mcs = plcp0 & ~MIMO_PLCP_40MHZ; 714 715 if (is40) { 716 if (CHSPEC_SB_UPPER(wlc_phy_chanspec_get(wlc->band->pi))) 717 mimo_ctlchbw = PHY_TXC1_BW_20MHZ_UP; 718 else 719 mimo_ctlchbw = PHY_TXC1_BW_20MHZ; 720 } 721 722 /* rebuild the rspec and rspec_fallback */ 723 rspec = RSPEC_MIMORATE; 724 rspec |= plcp[0] & ~MIMO_PLCP_40MHZ; 725 if (plcp[0] & MIMO_PLCP_40MHZ) 726 rspec |= (PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT); 727 728 fbr_iscck = !(le16_to_cpu(txh->XtraFrameTypes) & 0x03); 729 if (fbr_iscck) { 730 rspec_fallback = 731 cck_rspec(cck_phy2mac_rate(txh->FragPLCPFallback[0])); 732 } else { 733 rspec_fallback = RSPEC_MIMORATE; 734 rspec_fallback |= txh->FragPLCPFallback[0] & ~MIMO_PLCP_40MHZ; 735 if (txh->FragPLCPFallback[0] & MIMO_PLCP_40MHZ) 736 rspec_fallback |= PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT; 737 } 738 739 if (use_rts || use_cts) { 740 rts_rspec = 741 brcms_c_rspec_to_rts_rspec(wlc, rspec, 742 false, mimo_ctlchbw); 743 rts_rspec_fallback = 744 brcms_c_rspec_to_rts_rspec(wlc, rspec_fallback, 745 false, mimo_ctlchbw); 746 } 747 748 BRCMS_SET_MIMO_PLCP_LEN(plcp, session->ampdu_len); 749 /* mark plcp to indicate ampdu */ 750 BRCMS_SET_MIMO_PLCP_AMPDU(plcp); 751 752 /* reset the mixed mode header durations */ 753 if (txh->MModeLen) { 754 u16 mmodelen = brcms_c_calc_lsig_len(wlc, rspec, 755 session->ampdu_len); 756 txh->MModeLen = cpu_to_le16(mmodelen); 757 preamble_type = BRCMS_MM_PREAMBLE; 758 } 759 if (txh->MModeFbrLen) { 760 u16 mmfbrlen = brcms_c_calc_lsig_len(wlc, rspec_fallback, 761 session->ampdu_len); 762 txh->MModeFbrLen = cpu_to_le16(mmfbrlen); 763 fbr_preamble_type = BRCMS_MM_PREAMBLE; 764 } 765 766 /* set the preload length */ 767 if (mcs_2_rate(mcs, true, false) >= f->dmaxferrate) { 768 dma_len = min(dma_len, f->ampdu_pld_size); 769 txh->PreloadSize = cpu_to_le16(dma_len); 770 } else { 771 txh->PreloadSize = 0; 772 } 773 774 mch = le16_to_cpu(txh->MacTxControlHigh); 775 776 /* update RTS dur fields */ 777 if (use_rts || use_cts) { 778 u16 durid; 779 if ((mch & TXC_PREAMBLE_RTS_MAIN_SHORT) == 780 TXC_PREAMBLE_RTS_MAIN_SHORT) 781 rts_preamble_type = BRCMS_SHORT_PREAMBLE; 782 783 if ((mch & TXC_PREAMBLE_RTS_FB_SHORT) == 784 TXC_PREAMBLE_RTS_FB_SHORT) 785 rts_fbr_preamble_type = BRCMS_SHORT_PREAMBLE; 786 787 durid = brcms_c_compute_rtscts_dur(wlc, use_cts, rts_rspec, 788 rspec, rts_preamble_type, 789 preamble_type, 790 session->ampdu_len, true); 791 rts->duration = cpu_to_le16(durid); 792 durid = brcms_c_compute_rtscts_dur(wlc, use_cts, 793 rts_rspec_fallback, 794 rspec_fallback, 795 rts_fbr_preamble_type, 796 fbr_preamble_type, 797 session->ampdu_len, true); 798 txh->RTSDurFallback = cpu_to_le16(durid); 799 /* set TxFesTimeNormal */ 800 txh->TxFesTimeNormal = rts->duration; 801 /* set fallback rate version of TxFesTimeNormal */ 802 txh->TxFesTimeFallback = txh->RTSDurFallback; 803 } 804 805 /* set flag and plcp for fallback rate */ 806 if (fbr) { 807 mch |= TXC_AMPDU_FBR; 808 txh->MacTxControlHigh = cpu_to_le16(mch); 809 BRCMS_SET_MIMO_PLCP_AMPDU(plcp); 810 BRCMS_SET_MIMO_PLCP_AMPDU(txh->FragPLCPFallback); 811 } 812 813 brcms_dbg_ht(wlc->hw->d11core, "wl%d: count %d ampdu_len %d\n", 814 wlc->pub->unit, skb_queue_len(&session->skb_list), 815 session->ampdu_len); 816} 817 818static void 819brcms_c_ampdu_rate_status(struct brcms_c_info *wlc, 820 struct ieee80211_tx_info *tx_info, 821 struct tx_status *txs, u8 mcs) 822{ 823 struct ieee80211_tx_rate *txrate = tx_info->status.rates; 824 int i; 825 826 /* clear the rest of the rates */ 827 for (i = 2; i < IEEE80211_TX_MAX_RATES; i++) { 828 txrate[i].idx = -1; 829 txrate[i].count = 0; 830 } 831} 832 833static void 834brcms_c_ampdu_dotxstatus_complete(struct ampdu_info *ampdu, struct scb *scb, 835 struct sk_buff *p, struct tx_status *txs, 836 u32 s1, u32 s2) 837{ 838 struct scb_ampdu *scb_ampdu; 839 struct brcms_c_info *wlc = ampdu->wlc; 840 struct scb_ampdu_tid_ini *ini; 841 u8 bitmap[8], queue, tid; 842 struct d11txh *txh; 843 u8 *plcp; 844 struct ieee80211_hdr *h; 845 u16 seq, start_seq = 0, bindex, index, mcl; 846 u8 mcs = 0; 847 bool ba_recd = false, ack_recd = false; 848 u8 suc_mpdu = 0, tot_mpdu = 0; 849 uint supr_status; 850 bool retry = true; 851 u16 mimoantsel = 0; 852 u8 retry_limit; 853 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(p); 854 855#ifdef DEBUG 856 u8 hole[AMPDU_MAX_MPDU]; 857 memset(hole, 0, sizeof(hole)); 858#endif 859 860 scb_ampdu = &scb->scb_ampdu; 861 tid = (u8) (p->priority); 862 863 ini = &scb_ampdu->ini[tid]; 864 retry_limit = ampdu->retry_limit_tid[tid]; 865 memset(bitmap, 0, sizeof(bitmap)); 866 queue = txs->frameid & TXFID_QUEUE_MASK; 867 supr_status = txs->status & TX_STATUS_SUPR_MASK; 868 869 if (txs->status & TX_STATUS_ACK_RCV) { 870 WARN_ON(!(txs->status & TX_STATUS_INTERMEDIATE)); 871 start_seq = txs->sequence >> SEQNUM_SHIFT; 872 bitmap[0] = (txs->status & TX_STATUS_BA_BMAP03_MASK) >> 873 TX_STATUS_BA_BMAP03_SHIFT; 874 875 WARN_ON(s1 & TX_STATUS_INTERMEDIATE); 876 WARN_ON(!(s1 & TX_STATUS_AMPDU)); 877 878 bitmap[0] |= 879 (s1 & TX_STATUS_BA_BMAP47_MASK) << 880 TX_STATUS_BA_BMAP47_SHIFT; 881 bitmap[1] = (s1 >> 8) & 0xff; 882 bitmap[2] = (s1 >> 16) & 0xff; 883 bitmap[3] = (s1 >> 24) & 0xff; 884 885 bitmap[4] = s2 & 0xff; 886 bitmap[5] = (s2 >> 8) & 0xff; 887 bitmap[6] = (s2 >> 16) & 0xff; 888 bitmap[7] = (s2 >> 24) & 0xff; 889 890 ba_recd = true; 891 } else { 892 if (supr_status) { 893 if (supr_status == TX_STATUS_SUPR_BADCH) { 894 brcms_dbg_ht(wlc->hw->d11core, 895 "%s: Pkt tx suppressed, illegal channel possibly %d\n", 896 __func__, CHSPEC_CHANNEL( 897 wlc->default_bss->chanspec)); 898 } else { 899 if (supr_status != TX_STATUS_SUPR_FRAG) 900 brcms_err(wlc->hw->d11core, 901 "%s: supr_status 0x%x\n", 902 __func__, supr_status); 903 } 904 /* no need to retry for badch; will fail again */ 905 if (supr_status == TX_STATUS_SUPR_BADCH || 906 supr_status == TX_STATUS_SUPR_EXPTIME) { 907 retry = false; 908 } else if (supr_status == TX_STATUS_SUPR_EXPTIME) { 909 /* TX underflow: 910 * try tuning pre-loading or ampdu size 911 */ 912 } else if (supr_status == TX_STATUS_SUPR_FRAG) { 913 /* 914 * if there were underflows, but pre-loading 915 * is not active, notify rate adaptation. 916 */ 917 brcms_c_ffpld_check_txfunfl(wlc, queue); 918 } 919 } else if (txs->phyerr) { 920 brcms_dbg_ht(wlc->hw->d11core, 921 "%s: ampdu tx phy error (0x%x)\n", 922 __func__, txs->phyerr); 923 } 924 } 925 926 /* loop through all pkts and retry if not acked */ 927 while (p) { 928 tx_info = IEEE80211_SKB_CB(p); 929 txh = (struct d11txh *) p->data; 930 mcl = le16_to_cpu(txh->MacTxControlLow); 931 plcp = (u8 *) (txh + 1); 932 h = (struct ieee80211_hdr *)(plcp + D11_PHY_HDR_LEN); 933 seq = le16_to_cpu(h->seq_ctrl) >> SEQNUM_SHIFT; 934 935 trace_brcms_txdesc(&wlc->hw->d11core->dev, txh, sizeof(*txh)); 936 937 if (tot_mpdu == 0) { 938 mcs = plcp[0] & MIMO_PLCP_MCS_MASK; 939 mimoantsel = le16_to_cpu(txh->ABI_MimoAntSel); 940 } 941 942 index = TX_SEQ_TO_INDEX(seq); 943 ack_recd = false; 944 if (ba_recd) { 945 bindex = MODSUB_POW2(seq, start_seq, SEQNUM_MAX); 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 isset(bitmap, bindex), index); 950 /* if acked then clear bit and free packet */ 951 if ((bindex < AMPDU_TX_BA_MAX_WSIZE) 952 && isset(bitmap, bindex)) { 953 ini->txretry[index] = 0; 954 955 /* 956 * ampdu_ack_len: 957 * number of acked aggregated frames 958 */ 959 /* ampdu_len: number of aggregated frames */ 960 brcms_c_ampdu_rate_status(wlc, tx_info, txs, 961 mcs); 962 tx_info->flags |= IEEE80211_TX_STAT_ACK; 963 tx_info->flags |= IEEE80211_TX_STAT_AMPDU; 964 tx_info->status.ampdu_ack_len = 965 tx_info->status.ampdu_len = 1; 966 967 skb_pull(p, D11_PHY_HDR_LEN); 968 skb_pull(p, D11_TXH_LEN); 969 970 ieee80211_tx_status_irqsafe(wlc->pub->ieee_hw, 971 p); 972 ack_recd = true; 973 suc_mpdu++; 974 } 975 } 976 /* either retransmit or send bar if ack not recd */ 977 if (!ack_recd) { 978 if (retry && (ini->txretry[index] < (int)retry_limit)) { 979 int ret; 980 ini->txretry[index]++; 981 ret = brcms_c_txfifo(wlc, queue, p); 982 /* 983 * We shouldn't be out of space in the DMA 984 * ring here since we're reinserting a frame 985 * that was just pulled out. 986 */ 987 WARN_ONCE(ret, "queue %d out of txds\n", queue); 988 } else { 989 /* Retry timeout */ 990 ieee80211_tx_info_clear_status(tx_info); 991 tx_info->status.ampdu_ack_len = 0; 992 tx_info->status.ampdu_len = 1; 993 tx_info->flags |= 994 IEEE80211_TX_STAT_AMPDU_NO_BACK; 995 skb_pull(p, D11_PHY_HDR_LEN); 996 skb_pull(p, D11_TXH_LEN); 997 brcms_dbg_ht(wlc->hw->d11core, 998 "BA Timeout, seq %d\n", 999 seq); 1000 ieee80211_tx_status_irqsafe(wlc->pub->ieee_hw, 1001 p); 1002 } 1003 } 1004 tot_mpdu++; 1005 1006 /* break out if last packet of ampdu */ 1007 if (((mcl & TXC_AMPDU_MASK) >> TXC_AMPDU_SHIFT) == 1008 TXC_AMPDU_LAST) 1009 break; 1010 1011 p = dma_getnexttxp(wlc->hw->di[queue], DMA_RANGE_TRANSMITTED); 1012 } 1013 1014 /* update rate state */ 1015 brcms_c_antsel_antsel2id(wlc->asi, mimoantsel); 1016} 1017 1018void 1019brcms_c_ampdu_dotxstatus(struct ampdu_info *ampdu, struct scb *scb, 1020 struct sk_buff *p, struct tx_status *txs) 1021{ 1022 struct brcms_c_info *wlc = ampdu->wlc; 1023 u32 s1 = 0, s2 = 0; 1024 1025 /* BMAC_NOTE: For the split driver, second level txstatus comes later 1026 * So if the ACK was received then wait for the second level else just 1027 * call the first one 1028 */ 1029 if (txs->status & TX_STATUS_ACK_RCV) { 1030 u8 status_delay = 0; 1031 1032 /* wait till the next 8 bytes of txstatus is available */ 1033 s1 = bcma_read32(wlc->hw->d11core, D11REGOFFS(frmtxstatus)); 1034 while ((s1 & TXS_V) == 0) { 1035 udelay(1); 1036 status_delay++; 1037 if (status_delay > 10) 1038 return; /* error condition */ 1039 s1 = bcma_read32(wlc->hw->d11core, 1040 D11REGOFFS(frmtxstatus)); 1041 } 1042 1043 s2 = bcma_read32(wlc->hw->d11core, D11REGOFFS(frmtxstatus2)); 1044 } 1045 1046 if (scb) { 1047 brcms_c_ampdu_dotxstatus_complete(ampdu, scb, p, txs, s1, s2); 1048 } else { 1049 /* loop through all pkts and free */ 1050 u8 queue = txs->frameid & TXFID_QUEUE_MASK; 1051 struct d11txh *txh; 1052 u16 mcl; 1053 while (p) { 1054 txh = (struct d11txh *) p->data; 1055 trace_brcms_txdesc(&wlc->hw->d11core->dev, txh, 1056 sizeof(*txh)); 1057 mcl = le16_to_cpu(txh->MacTxControlLow); 1058 brcmu_pkt_buf_free_skb(p); 1059 /* break out if last packet of ampdu */ 1060 if (((mcl & TXC_AMPDU_MASK) >> TXC_AMPDU_SHIFT) == 1061 TXC_AMPDU_LAST) 1062 break; 1063 p = dma_getnexttxp(wlc->hw->di[queue], 1064 DMA_RANGE_TRANSMITTED); 1065 } 1066 } 1067} 1068 1069void brcms_c_ampdu_macaddr_upd(struct brcms_c_info *wlc) 1070{ 1071 char template[T_RAM_ACCESS_SZ * 2]; 1072 1073 /* driver needs to write the ta in the template; ta is at offset 16 */ 1074 memset(template, 0, sizeof(template)); 1075 memcpy(template, wlc->pub->cur_etheraddr, ETH_ALEN); 1076 brcms_b_write_template_ram(wlc->hw, (T_BA_TPL_BASE + 16), 1077 (T_RAM_ACCESS_SZ * 2), 1078 template); 1079} 1080 1081bool brcms_c_aggregatable(struct brcms_c_info *wlc, u8 tid) 1082{ 1083 return wlc->ampdu->ini_enable[tid]; 1084} 1085 1086void brcms_c_ampdu_shm_upd(struct ampdu_info *ampdu) 1087{ 1088 struct brcms_c_info *wlc = ampdu->wlc; 1089 1090 /* 1091 * Extend ucode internal watchdog timer to 1092 * match larger received frames 1093 */ 1094 if ((ampdu->rx_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) == 1095 IEEE80211_HT_MAX_AMPDU_64K) { 1096 brcms_b_write_shm(wlc->hw, M_MIMO_MAXSYM, MIMO_MAXSYM_MAX); 1097 brcms_b_write_shm(wlc->hw, M_WATCHDOG_8TU, WATCHDOG_8TU_MAX); 1098 } else { 1099 brcms_b_write_shm(wlc->hw, M_MIMO_MAXSYM, MIMO_MAXSYM_DEF); 1100 brcms_b_write_shm(wlc->hw, M_WATCHDOG_8TU, WATCHDOG_8TU_DEF); 1101 } 1102} 1103 1104/* 1105 * callback function that helps invalidating ampdu packets in a DMA queue 1106 */ 1107static void dma_cb_fn_ampdu(void *txi, void *arg_a) 1108{ 1109 struct ieee80211_sta *sta = arg_a; 1110 struct ieee80211_tx_info *tx_info = (struct ieee80211_tx_info *)txi; 1111 1112 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && 1113 (tx_info->rate_driver_data[0] == sta || sta == NULL)) 1114 tx_info->rate_driver_data[0] = NULL; 1115} 1116 1117/* 1118 * When a remote party is no longer available for ampdu communication, any 1119 * pending tx ampdu packets in the driver have to be flushed. 1120 */ 1121void brcms_c_ampdu_flush(struct brcms_c_info *wlc, 1122 struct ieee80211_sta *sta, u16 tid) 1123{ 1124 brcms_c_inval_dma_pkts(wlc->hw, sta, dma_cb_fn_ampdu); 1125} 1126