diff options
Diffstat (limited to 'drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c')
| -rw-r--r-- | drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c | 1125 |
1 files changed, 1125 insertions, 0 deletions
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c new file mode 100644 index 000000000..c9fb4b0cf --- /dev/null +++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c @@ -0,0 +1,1125 @@ +/* + * Copyright (c) 2010 Broadcom Corporation + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY + * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ +#include <net/mac80211.h> + +#include "rate.h" +#include "scb.h" +#include "phy/phy_hal.h" +#include "antsel.h" +#include "main.h" +#include "ampdu.h" +#include "debug.h" +#include "brcms_trace_events.h" + +/* max number of mpdus in an ampdu */ +#define AMPDU_MAX_MPDU 32 +/* max number of mpdus in an ampdu to a legacy */ +#define AMPDU_NUM_MPDU_LEGACY 16 +/* max Tx ba window size (in pdu) */ +#define AMPDU_TX_BA_MAX_WSIZE 64 +/* default Tx ba window size (in pdu) */ +#define AMPDU_TX_BA_DEF_WSIZE 64 +/* default Rx ba window size (in pdu) */ +#define AMPDU_RX_BA_DEF_WSIZE 64 +/* max Rx ba window size (in pdu) */ +#define AMPDU_RX_BA_MAX_WSIZE 64 +/* max dur of tx ampdu (in msec) */ +#define AMPDU_MAX_DUR 5 +/* default tx retry limit */ +#define AMPDU_DEF_RETRY_LIMIT 5 +/* default tx retry limit at reg rate */ +#define AMPDU_DEF_RR_RETRY_LIMIT 2 +/* default ffpld reserved bytes */ +#define AMPDU_DEF_FFPLD_RSVD 2048 +/* # of inis to be freed on detach */ +#define AMPDU_INI_FREE 10 +/* max # of mpdus released at a time */ +#define AMPDU_SCB_MAX_RELEASE 20 + +#define NUM_FFPLD_FIFO 4 /* number of fifo concerned by pre-loading */ +#define FFPLD_TX_MAX_UNFL 200 /* default value of the average number of ampdu + * without underflows + */ +#define FFPLD_MPDU_SIZE 1800 /* estimate of maximum mpdu size */ +#define FFPLD_MAX_MCS 23 /* we don't deal with mcs 32 */ +#define FFPLD_PLD_INCR 1000 /* increments in bytes */ +#define FFPLD_MAX_AMPDU_CNT 5000 /* maximum number of ampdu we + * accumulate between resets. + */ + +#define AMPDU_DELIMITER_LEN 4 + +/* max allowed number of mpdus in an ampdu (2 streams) */ +#define AMPDU_NUM_MPDU 16 + +#define TX_SEQ_TO_INDEX(seq) ((seq) % AMPDU_TX_BA_MAX_WSIZE) + +/* max possible overhead per mpdu in the ampdu; 3 is for roundup if needed */ +#define AMPDU_MAX_MPDU_OVERHEAD (FCS_LEN + DOT11_ICV_AES_LEN +\ + AMPDU_DELIMITER_LEN + 3\ + + DOT11_A4_HDR_LEN + DOT11_QOS_LEN + DOT11_IV_MAX_LEN) + +/* modulo add/sub, bound = 2^k */ +#define MODADD_POW2(x, y, bound) (((x) + (y)) & ((bound) - 1)) +#define MODSUB_POW2(x, y, bound) (((x) - (y)) & ((bound) - 1)) + +/* structure to hold tx fifo information and pre-loading state + * counters specific to tx underflows of ampdus + * some counters might be redundant with the ones in wlc or ampdu structures. + * This allows to maintain a specific state independently of + * how often and/or when the wlc counters are updated. + * + * ampdu_pld_size: number of bytes to be pre-loaded + * mcs2ampdu_table: per-mcs max # of mpdus in an ampdu + * prev_txfunfl: num of underflows last read from the HW macstats counter + * accum_txfunfl: num of underflows since we modified pld params + * accum_txampdu: num of tx ampdu since we modified pld params + * prev_txampdu: previous reading of tx ampdu + * dmaxferrate: estimated dma avg xfer rate in kbits/sec + */ +struct brcms_fifo_info { + u16 ampdu_pld_size; + u8 mcs2ampdu_table[FFPLD_MAX_MCS + 1]; + u16 prev_txfunfl; + u32 accum_txfunfl; + u32 accum_txampdu; + u32 prev_txampdu; + u32 dmaxferrate; +}; + +/* AMPDU module specific state + * + * wlc: pointer to main wlc structure + * scb_handle: scb cubby handle to retrieve data from scb + * ini_enable: per-tid initiator enable/disable of ampdu + * ba_tx_wsize: Tx ba window size (in pdu) + * ba_rx_wsize: Rx ba window size (in pdu) + * retry_limit: mpdu transmit retry limit + * rr_retry_limit: mpdu transmit retry limit at regular rate + * retry_limit_tid: per-tid mpdu transmit retry limit + * rr_retry_limit_tid: per-tid mpdu transmit retry limit at regular rate + * mpdu_density: min mpdu spacing (0-7) ==> 2^(x-1)/8 usec + * max_pdu: max pdus allowed in ampdu + * dur: max duration of an ampdu (in msec) + * rx_factor: maximum rx ampdu factor (0-3) ==> 2^(13+x) bytes + * ffpld_rsvd: number of bytes to reserve for preload + * max_txlen: max size of ampdu per mcs, bw and sgi + * mfbr: enable multiple fallback rate + * tx_max_funl: underflows should be kept such that + * (tx_max_funfl*underflows) < tx frames + * fifo_tb: table of fifo infos + */ +struct ampdu_info { + struct brcms_c_info *wlc; + int scb_handle; + u8 ini_enable[AMPDU_MAX_SCB_TID]; + u8 ba_tx_wsize; + u8 ba_rx_wsize; + u8 retry_limit; + u8 rr_retry_limit; + u8 retry_limit_tid[AMPDU_MAX_SCB_TID]; + u8 rr_retry_limit_tid[AMPDU_MAX_SCB_TID]; + u8 mpdu_density; + s8 max_pdu; + u8 dur; + u8 rx_factor; + u32 ffpld_rsvd; + u32 max_txlen[MCS_TABLE_SIZE][2][2]; + bool mfbr; + u32 tx_max_funl; + struct brcms_fifo_info fifo_tb[NUM_FFPLD_FIFO]; +}; + +/* used for flushing ampdu packets */ +struct cb_del_ampdu_pars { + struct ieee80211_sta *sta; + u16 tid; +}; + +static void brcms_c_scb_ampdu_update_max_txlen(struct ampdu_info *ampdu, u8 dur) +{ + u32 rate, mcs; + + for (mcs = 0; mcs < MCS_TABLE_SIZE; mcs++) { + /* rate is in Kbps; dur is in msec ==> len = (rate * dur) / 8 */ + /* 20MHz, No SGI */ + rate = mcs_2_rate(mcs, false, false); + ampdu->max_txlen[mcs][0][0] = (rate * dur) >> 3; + /* 40 MHz, No SGI */ + rate = mcs_2_rate(mcs, true, false); + ampdu->max_txlen[mcs][1][0] = (rate * dur) >> 3; + /* 20MHz, SGI */ + rate = mcs_2_rate(mcs, false, true); + ampdu->max_txlen[mcs][0][1] = (rate * dur) >> 3; + /* 40 MHz, SGI */ + rate = mcs_2_rate(mcs, true, true); + ampdu->max_txlen[mcs][1][1] = (rate * dur) >> 3; + } +} + +static bool brcms_c_ampdu_cap(struct ampdu_info *ampdu) +{ + if (BRCMS_PHY_11N_CAP(ampdu->wlc->band)) + return true; + else + return false; +} + +static int brcms_c_ampdu_set(struct ampdu_info *ampdu, bool on) +{ + struct brcms_c_info *wlc = ampdu->wlc; + struct bcma_device *core = wlc->hw->d11core; + + wlc->pub->_ampdu = false; + + if (on) { + if (!(wlc->pub->_n_enab & SUPPORT_11N)) { + brcms_err(core, "wl%d: driver not nmode enabled\n", + wlc->pub->unit); + return -ENOTSUPP; + } + if (!brcms_c_ampdu_cap(ampdu)) { + brcms_err(core, "wl%d: device not ampdu capable\n", + wlc->pub->unit); + return -ENOTSUPP; + } + wlc->pub->_ampdu = on; + } + + return 0; +} + +static void brcms_c_ffpld_init(struct ampdu_info *ampdu) +{ + int i, j; + struct brcms_fifo_info *fifo; + + for (j = 0; j < NUM_FFPLD_FIFO; j++) { + fifo = (ampdu->fifo_tb + j); + fifo->ampdu_pld_size = 0; + for (i = 0; i <= FFPLD_MAX_MCS; i++) + fifo->mcs2ampdu_table[i] = 255; + fifo->dmaxferrate = 0; + fifo->accum_txampdu = 0; + fifo->prev_txfunfl = 0; + fifo->accum_txfunfl = 0; + + } +} + +struct ampdu_info *brcms_c_ampdu_attach(struct brcms_c_info *wlc) +{ + struct ampdu_info *ampdu; + int i; + + ampdu = kzalloc(sizeof(struct ampdu_info), GFP_ATOMIC); + if (!ampdu) + return NULL; + + ampdu->wlc = wlc; + + for (i = 0; i < AMPDU_MAX_SCB_TID; i++) + ampdu->ini_enable[i] = true; + /* Disable ampdu for VO by default */ + ampdu->ini_enable[PRIO_8021D_VO] = false; + ampdu->ini_enable[PRIO_8021D_NC] = false; + + /* Disable ampdu for BK by default since not enough fifo space */ + ampdu->ini_enable[PRIO_8021D_NONE] = false; + ampdu->ini_enable[PRIO_8021D_BK] = false; + + ampdu->ba_tx_wsize = AMPDU_TX_BA_DEF_WSIZE; + ampdu->ba_rx_wsize = AMPDU_RX_BA_DEF_WSIZE; + ampdu->mpdu_density = AMPDU_DEF_MPDU_DENSITY; + ampdu->max_pdu = AUTO; + ampdu->dur = AMPDU_MAX_DUR; + + ampdu->ffpld_rsvd = AMPDU_DEF_FFPLD_RSVD; + /* + * bump max ampdu rcv size to 64k for all 11n + * devices except 4321A0 and 4321A1 + */ + if (BRCMS_ISNPHY(wlc->band) && NREV_LT(wlc->band->phyrev, 2)) + ampdu->rx_factor = IEEE80211_HT_MAX_AMPDU_32K; + else + ampdu->rx_factor = IEEE80211_HT_MAX_AMPDU_64K; + ampdu->retry_limit = AMPDU_DEF_RETRY_LIMIT; + ampdu->rr_retry_limit = AMPDU_DEF_RR_RETRY_LIMIT; + + for (i = 0; i < AMPDU_MAX_SCB_TID; i++) { + ampdu->retry_limit_tid[i] = ampdu->retry_limit; + ampdu->rr_retry_limit_tid[i] = ampdu->rr_retry_limit; + } + + brcms_c_scb_ampdu_update_max_txlen(ampdu, ampdu->dur); + ampdu->mfbr = false; + /* try to set ampdu to the default value */ + brcms_c_ampdu_set(ampdu, wlc->pub->_ampdu); + + ampdu->tx_max_funl = FFPLD_TX_MAX_UNFL; + brcms_c_ffpld_init(ampdu); + + return ampdu; +} + +void brcms_c_ampdu_detach(struct ampdu_info *ampdu) +{ + kfree(ampdu); +} + +static void brcms_c_scb_ampdu_update_config(struct ampdu_info *ampdu, + struct scb *scb) +{ + struct scb_ampdu *scb_ampdu = &scb->scb_ampdu; + int i; + + scb_ampdu->max_pdu = AMPDU_NUM_MPDU; + + /* go back to legacy size if some preloading is occurring */ + for (i = 0; i < NUM_FFPLD_FIFO; i++) { + if (ampdu->fifo_tb[i].ampdu_pld_size > FFPLD_PLD_INCR) + scb_ampdu->max_pdu = AMPDU_NUM_MPDU_LEGACY; + } + + /* apply user override */ + if (ampdu->max_pdu != AUTO) + scb_ampdu->max_pdu = (u8) ampdu->max_pdu; + + scb_ampdu->release = min_t(u8, scb_ampdu->max_pdu, + AMPDU_SCB_MAX_RELEASE); + + if (scb_ampdu->max_rx_ampdu_bytes) + scb_ampdu->release = min_t(u8, scb_ampdu->release, + scb_ampdu->max_rx_ampdu_bytes / 1600); + + scb_ampdu->release = min(scb_ampdu->release, + ampdu->fifo_tb[TX_AC_BE_FIFO]. + mcs2ampdu_table[FFPLD_MAX_MCS]); +} + +static void brcms_c_scb_ampdu_update_config_all(struct ampdu_info *ampdu) +{ + brcms_c_scb_ampdu_update_config(ampdu, &du->wlc->pri_scb); +} + +static void brcms_c_ffpld_calc_mcs2ampdu_table(struct ampdu_info *ampdu, int f) +{ + int i; + u32 phy_rate, dma_rate, tmp; + u8 max_mpdu; + struct brcms_fifo_info *fifo = (ampdu->fifo_tb + f); + + /* recompute the dma rate */ + /* note : we divide/multiply by 100 to avoid integer overflows */ + max_mpdu = min_t(u8, fifo->mcs2ampdu_table[FFPLD_MAX_MCS], + AMPDU_NUM_MPDU_LEGACY); + phy_rate = mcs_2_rate(FFPLD_MAX_MCS, true, false); + dma_rate = + (((phy_rate / 100) * + (max_mpdu * FFPLD_MPDU_SIZE - fifo->ampdu_pld_size)) + / (max_mpdu * FFPLD_MPDU_SIZE)) * 100; + fifo->dmaxferrate = dma_rate; + + /* fill up the mcs2ampdu table; do not recalc the last mcs */ + dma_rate = dma_rate >> 7; + for (i = 0; i < FFPLD_MAX_MCS; i++) { + /* shifting to keep it within integer range */ + phy_rate = mcs_2_rate(i, true, false) >> 7; + if (phy_rate > dma_rate) { + tmp = ((fifo->ampdu_pld_size * phy_rate) / + ((phy_rate - dma_rate) * FFPLD_MPDU_SIZE)) + 1; + tmp = min_t(u32, tmp, 255); + fifo->mcs2ampdu_table[i] = (u8) tmp; + } + } +} + +/* evaluate the dma transfer rate using the tx underflows as feedback. + * If necessary, increase tx fifo preloading. If not enough, + * decrease maximum ampdu size for each mcs till underflows stop + * Return 1 if pre-loading not active, -1 if not an underflow event, + * 0 if pre-loading module took care of the event. + */ +static int brcms_c_ffpld_check_txfunfl(struct brcms_c_info *wlc, int fid) +{ + struct ampdu_info *ampdu = wlc->ampdu; + u32 phy_rate = mcs_2_rate(FFPLD_MAX_MCS, true, false); + u32 txunfl_ratio; + u8 max_mpdu; + u32 current_ampdu_cnt = 0; + u16 max_pld_size; + u32 new_txunfl; + struct brcms_fifo_info *fifo = (ampdu->fifo_tb + fid); + uint xmtfifo_sz; + u16 cur_txunfl; + + /* return if we got here for a different reason than underflows */ + cur_txunfl = brcms_b_read_shm(wlc->hw, + M_UCODE_MACSTAT + + offsetof(struct macstat, txfunfl[fid])); + new_txunfl = (u16) (cur_txunfl - fifo->prev_txfunfl); + if (new_txunfl == 0) { + brcms_dbg_ht(wlc->hw->d11core, + "TX status FRAG set but no tx underflows\n"); + return -1; + } + fifo->prev_txfunfl = cur_txunfl; + + if (!ampdu->tx_max_funl) + return 1; + + /* check if fifo is big enough */ + if (brcms_b_xmtfifo_sz_get(wlc->hw, fid, &xmtfifo_sz)) + return -1; + + if ((TXFIFO_SIZE_UNIT * (u32) xmtfifo_sz) <= ampdu->ffpld_rsvd) + return 1; + + max_pld_size = TXFIFO_SIZE_UNIT * xmtfifo_sz - ampdu->ffpld_rsvd; + fifo->accum_txfunfl += new_txunfl; + + /* we need to wait for at least 10 underflows */ + if (fifo->accum_txfunfl < 10) + return 0; + + brcms_dbg_ht(wlc->hw->d11core, "ampdu_count %d tx_underflows %d\n", + current_ampdu_cnt, fifo->accum_txfunfl); + + /* + compute the current ratio of tx unfl per ampdu. + When the current ampdu count becomes too + big while the ratio remains small, we reset + the current count in order to not + introduce too big of a latency in detecting a + large amount of tx underflows later. + */ + + txunfl_ratio = current_ampdu_cnt / fifo->accum_txfunfl; + + if (txunfl_ratio > ampdu->tx_max_funl) { + if (current_ampdu_cnt >= FFPLD_MAX_AMPDU_CNT) + fifo->accum_txfunfl = 0; + + return 0; + } + max_mpdu = min_t(u8, fifo->mcs2ampdu_table[FFPLD_MAX_MCS], + AMPDU_NUM_MPDU_LEGACY); + + /* In case max value max_pdu is already lower than + the fifo depth, there is nothing more we can do. + */ + + if (fifo->ampdu_pld_size >= max_mpdu * FFPLD_MPDU_SIZE) { + fifo->accum_txfunfl = 0; + return 0; + } + + if (fifo->ampdu_pld_size < max_pld_size) { + + /* increment by TX_FIFO_PLD_INC bytes */ + fifo->ampdu_pld_size += FFPLD_PLD_INCR; + if (fifo->ampdu_pld_size > max_pld_size) + fifo->ampdu_pld_size = max_pld_size; + + /* update scb release size */ + brcms_c_scb_ampdu_update_config_all(ampdu); + + /* + * compute a new dma xfer rate for max_mpdu @ max mcs. + * This is the minimum dma rate that can achieve no + * underflow condition for the current mpdu size. + * + * note : we divide/multiply by 100 to avoid integer overflows + */ + fifo->dmaxferrate = + (((phy_rate / 100) * + (max_mpdu * FFPLD_MPDU_SIZE - fifo->ampdu_pld_size)) + / (max_mpdu * FFPLD_MPDU_SIZE)) * 100; + + brcms_dbg_ht(wlc->hw->d11core, + "DMA estimated transfer rate %d; " + "pre-load size %d\n", + fifo->dmaxferrate, fifo->ampdu_pld_size); + } else { + + /* decrease ampdu size */ + if (fifo->mcs2ampdu_table[FFPLD_MAX_MCS] > 1) { + if (fifo->mcs2ampdu_table[FFPLD_MAX_MCS] == 255) + fifo->mcs2ampdu_table[FFPLD_MAX_MCS] = + AMPDU_NUM_MPDU_LEGACY - 1; + else + fifo->mcs2ampdu_table[FFPLD_MAX_MCS] -= 1; + + /* recompute the table */ + brcms_c_ffpld_calc_mcs2ampdu_table(ampdu, fid); + + /* update scb release size */ + brcms_c_scb_ampdu_update_config_all(ampdu); + } + } + fifo->accum_txfunfl = 0; + return 0; +} + +void +brcms_c_ampdu_tx_operational(struct brcms_c_info *wlc, u8 tid, + u8 ba_wsize, /* negotiated ba window size (in pdu) */ + uint max_rx_ampdu_bytes) /* from ht_cap in beacon */ +{ + struct scb_ampdu *scb_ampdu; + struct scb_ampdu_tid_ini *ini; + struct ampdu_info *ampdu = wlc->ampdu; + struct scb *scb = &wlc->pri_scb; + scb_ampdu = &scb->scb_ampdu; + + if (!ampdu->ini_enable[tid]) { + brcms_err(wlc->hw->d11core, "%s: Rejecting tid %d\n", + __func__, tid); + return; + } + + ini = &scb_ampdu->ini[tid]; + ini->tid = tid; + ini->scb = scb_ampdu->scb; + ini->ba_wsize = ba_wsize; + scb_ampdu->max_rx_ampdu_bytes = max_rx_ampdu_bytes; +} + +void brcms_c_ampdu_reset_session(struct brcms_ampdu_session *session, + struct brcms_c_info *wlc) +{ + session->wlc = wlc; + skb_queue_head_init(&session->skb_list); + session->max_ampdu_len = 0; /* determined from first MPDU */ + session->max_ampdu_frames = 0; /* determined from first MPDU */ + session->ampdu_len = 0; + session->dma_len = 0; +} + +/* + * Preps the given packet for AMPDU based on the session data. If the + * frame cannot be accomodated in the current session, -ENOSPC is + * returned. + */ +int brcms_c_ampdu_add_frame(struct brcms_ampdu_session *session, + struct sk_buff *p) +{ + struct brcms_c_info *wlc = session->wlc; + struct ampdu_info *ampdu = wlc->ampdu; + struct scb *scb = &wlc->pri_scb; + struct scb_ampdu *scb_ampdu = &scb->scb_ampdu; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(p); + struct ieee80211_tx_rate *txrate = tx_info->status.rates; + struct d11txh *txh = (struct d11txh *)p->data; + unsigned ampdu_frames; + u8 ndelim, tid; + u8 *plcp; + uint len; + u16 mcl; + bool fbr_iscck; + bool rr; + + ndelim = txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM]; + plcp = (u8 *)(txh + 1); + fbr_iscck = !(le16_to_cpu(txh->XtraFrameTypes) & 0x03); + len = fbr_iscck ? BRCMS_GET_CCK_PLCP_LEN(txh->FragPLCPFallback) : + BRCMS_GET_MIMO_PLCP_LEN(txh->FragPLCPFallback); + len = roundup(len, 4) + (ndelim + 1) * AMPDU_DELIMITER_LEN; + + ampdu_frames = skb_queue_len(&session->skb_list); + if (ampdu_frames != 0) { + struct sk_buff *first; + + if (ampdu_frames + 1 > session->max_ampdu_frames || + session->ampdu_len + len > session->max_ampdu_len) + return -ENOSPC; + + /* + * We aren't really out of space if the new frame is of + * a different priority, but we want the same behaviour + * so return -ENOSPC anyway. + * + * XXX: The old AMPDU code did this, but is it really + * necessary? + */ + first = skb_peek(&session->skb_list); + if (p->priority != first->priority) + return -ENOSPC; + } + + /* + * Now that we're sure this frame can be accomodated, update the + * session information. + */ + session->ampdu_len += len; + session->dma_len += p->len; + + tid = (u8)p->priority; + + /* Handle retry limits */ + if (txrate[0].count <= ampdu->rr_retry_limit_tid[tid]) { + txrate[0].count++; + rr = true; + } else { + txrate[1].count++; + rr = false; + } + + if (ampdu_frames == 0) { + u8 plcp0, plcp3, is40, sgi, mcs; + uint fifo = le16_to_cpu(txh->TxFrameID) & TXFID_QUEUE_MASK; + struct brcms_fifo_info *f = &du->fifo_tb[fifo]; + + if (rr) { + plcp0 = plcp[0]; + plcp3 = plcp[3]; + } else { + plcp0 = txh->FragPLCPFallback[0]; + plcp3 = txh->FragPLCPFallback[3]; + + } + + /* Limit AMPDU size based on MCS */ + is40 = (plcp0 & MIMO_PLCP_40MHZ) ? 1 : 0; + sgi = plcp3_issgi(plcp3) ? 1 : 0; + mcs = plcp0 & ~MIMO_PLCP_40MHZ; + session->max_ampdu_len = min(scb_ampdu->max_rx_ampdu_bytes, + ampdu->max_txlen[mcs][is40][sgi]); + + session->max_ampdu_frames = scb_ampdu->max_pdu; + if (mcs_2_rate(mcs, true, false) >= f->dmaxferrate) { + session->max_ampdu_frames = + min_t(u16, f->mcs2ampdu_table[mcs], + session->max_ampdu_frames); + } + } + + /* + * Treat all frames as "middle" frames of AMPDU here. First and + * last frames must be fixed up after all MPDUs have been prepped. + */ + mcl = le16_to_cpu(txh->MacTxControlLow); + mcl &= ~TXC_AMPDU_MASK; + mcl |= (TXC_AMPDU_MIDDLE << TXC_AMPDU_SHIFT); + mcl &= ~(TXC_STARTMSDU | TXC_SENDRTS | TXC_SENDCTS); + txh->MacTxControlLow = cpu_to_le16(mcl); + txh->PreloadSize = 0; /* always default to 0 */ + + skb_queue_tail(&session->skb_list, p); + + return 0; +} + +void brcms_c_ampdu_finalize(struct brcms_ampdu_session *session) +{ + struct brcms_c_info *wlc = session->wlc; + struct ampdu_info *ampdu = wlc->ampdu; + struct sk_buff *first, *last; + struct d11txh *txh; + struct ieee80211_tx_info *tx_info; + struct ieee80211_tx_rate *txrate; + u8 ndelim; + u8 *plcp; + uint len; + uint fifo; + struct brcms_fifo_info *f; + u16 mcl; + bool fbr; + bool fbr_iscck; + struct ieee80211_rts *rts; + bool use_rts = false, use_cts = false; + u16 dma_len = session->dma_len; + u16 mimo_ctlchbw = PHY_TXC1_BW_20MHZ; + u32 rspec = 0, rspec_fallback = 0; + u32 rts_rspec = 0, rts_rspec_fallback = 0; + u8 plcp0, is40, mcs; + u16 mch; + u8 preamble_type = BRCMS_GF_PREAMBLE; + u8 fbr_preamble_type = BRCMS_GF_PREAMBLE; + u8 rts_preamble_type = BRCMS_LONG_PREAMBLE; + u8 rts_fbr_preamble_type = BRCMS_LONG_PREAMBLE; + + if (skb_queue_empty(&session->skb_list)) + return; + + first = skb_peek(&session->skb_list); + last = skb_peek_tail(&session->skb_list); + + /* Need to fix up last MPDU first to adjust AMPDU length */ + txh = (struct d11txh *)last->data; + fifo = le16_to_cpu(txh->TxFrameID) & TXFID_QUEUE_MASK; + f = &du->fifo_tb[fifo]; + + mcl = le16_to_cpu(txh->MacTxControlLow); + mcl &= ~TXC_AMPDU_MASK; + mcl |= (TXC_AMPDU_LAST << TXC_AMPDU_SHIFT); + txh->MacTxControlLow = cpu_to_le16(mcl); + + /* remove the null delimiter after last mpdu */ + ndelim = txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM]; + txh->RTSPLCPFallback[AMPDU_FBR_NULL_DELIM] = 0; + session->ampdu_len -= ndelim * AMPDU_DELIMITER_LEN; + + /* remove the pad len from last mpdu */ + fbr_iscck = ((le16_to_cpu(txh->XtraFrameTypes) & 0x3) == 0); + len = fbr_iscck ? BRCMS_GET_CCK_PLCP_LEN(txh->FragPLCPFallback) : + BRCMS_GET_MIMO_PLCP_LEN(txh->FragPLCPFallback); + session->ampdu_len -= roundup(len, 4) - len; + + /* Now fix up the first MPDU */ + tx_info = IEEE80211_SKB_CB(first); + txrate = tx_info->status.rates; + txh = (struct d11txh *)first->data; + plcp = (u8 *)(txh + 1); + rts = (struct ieee80211_rts *)&txh->rts_frame; + + mcl = le16_to_cpu(txh->MacTxControlLow); + /* If only one MPDU leave it marked as last */ + if (first != last) { + mcl &= ~TXC_AMPDU_MASK; + mcl |= (TXC_AMPDU_FIRST << TXC_AMPDU_SHIFT); + } + mcl |= TXC_STARTMSDU; + if (ieee80211_is_rts(rts->frame_control)) { + mcl |= TXC_SENDRTS; + use_rts = true; + } + if (ieee80211_is_cts(rts->frame_control)) { + mcl |= TXC_SENDCTS; + use_cts = true; + } + txh->MacTxControlLow = cpu_to_le16(mcl); + + fbr = txrate[1].count > 0; + if (!fbr) + plcp0 = plcp[0]; + else + plcp0 = txh->FragPLCPFallback[0]; + + is40 = (plcp0 & MIMO_PLCP_40MHZ) ? 1 : 0; + mcs = plcp0 & ~MIMO_PLCP_40MHZ; + + if (is40) { + if (CHSPEC_SB_UPPER(wlc_phy_chanspec_get(wlc->band->pi))) + mimo_ctlchbw = PHY_TXC1_BW_20MHZ_UP; + else + mimo_ctlchbw = PHY_TXC1_BW_20MHZ; + } + + /* rebuild the rspec and rspec_fallback */ + rspec = RSPEC_MIMORATE; + rspec |= plcp[0] & ~MIMO_PLCP_40MHZ; + if (plcp[0] & MIMO_PLCP_40MHZ) + rspec |= (PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT); + + fbr_iscck = !(le16_to_cpu(txh->XtraFrameTypes) & 0x03); + if (fbr_iscck) { + rspec_fallback = + cck_rspec(cck_phy2mac_rate(txh->FragPLCPFallback[0])); + } else { + rspec_fallback = RSPEC_MIMORATE; + rspec_fallback |= txh->FragPLCPFallback[0] & ~MIMO_PLCP_40MHZ; + if (txh->FragPLCPFallback[0] & MIMO_PLCP_40MHZ) + rspec_fallback |= PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT; + } + + if (use_rts || use_cts) { + rts_rspec = + brcms_c_rspec_to_rts_rspec(wlc, rspec, + false, mimo_ctlchbw); + rts_rspec_fallback = + brcms_c_rspec_to_rts_rspec(wlc, rspec_fallback, + false, mimo_ctlchbw); + } + + BRCMS_SET_MIMO_PLCP_LEN(plcp, session->ampdu_len); + /* mark plcp to indicate ampdu */ + BRCMS_SET_MIMO_PLCP_AMPDU(plcp); + + /* reset the mixed mode header durations */ + if (txh->MModeLen) { + u16 mmodelen = brcms_c_calc_lsig_len(wlc, rspec, + session->ampdu_len); + txh->MModeLen = cpu_to_le16(mmodelen); + preamble_type = BRCMS_MM_PREAMBLE; + } + if (txh->MModeFbrLen) { + u16 mmfbrlen = brcms_c_calc_lsig_len(wlc, rspec_fallback, + session->ampdu_len); + txh->MModeFbrLen = cpu_to_le16(mmfbrlen); + fbr_preamble_type = BRCMS_MM_PREAMBLE; + } + + /* set the preload length */ + if (mcs_2_rate(mcs, true, false) >= f->dmaxferrate) { + dma_len = min(dma_len, f->ampdu_pld_size); + txh->PreloadSize = cpu_to_le16(dma_len); + } else { + txh->PreloadSize = 0; + } + + mch = le16_to_cpu(txh->MacTxControlHigh); + + /* update RTS dur fields */ + if (use_rts || use_cts) { + u16 durid; + if ((mch & TXC_PREAMBLE_RTS_MAIN_SHORT) == + TXC_PREAMBLE_RTS_MAIN_SHORT) + rts_preamble_type = BRCMS_SHORT_PREAMBLE; + + if ((mch & TXC_PREAMBLE_RTS_FB_SHORT) == + TXC_PREAMBLE_RTS_FB_SHORT) + rts_fbr_preamble_type = BRCMS_SHORT_PREAMBLE; + + durid = brcms_c_compute_rtscts_dur(wlc, use_cts, rts_rspec, + rspec, rts_preamble_type, + preamble_type, + session->ampdu_len, true); + rts->duration = cpu_to_le16(durid); + durid = brcms_c_compute_rtscts_dur(wlc, use_cts, + rts_rspec_fallback, + rspec_fallback, + rts_fbr_preamble_type, + fbr_preamble_type, + session->ampdu_len, true); + txh->RTSDurFallback = cpu_to_le16(durid); + /* set TxFesTimeNormal */ + txh->TxFesTimeNormal = rts->duration; + /* set fallback rate version of TxFesTimeNormal */ + txh->TxFesTimeFallback = txh->RTSDurFallback; + } + + /* set flag and plcp for fallback rate */ + if (fbr) { + mch |= TXC_AMPDU_FBR; + txh->MacTxControlHigh = cpu_to_le16(mch); + BRCMS_SET_MIMO_PLCP_AMPDU(plcp); + BRCMS_SET_MIMO_PLCP_AMPDU(txh->FragPLCPFallback); + } + + brcms_dbg_ht(wlc->hw->d11core, "wl%d: count %d ampdu_len %d\n", + wlc->pub->unit, skb_queue_len(&session->skb_list), + session->ampdu_len); +} + +static void +brcms_c_ampdu_rate_status(struct brcms_c_info *wlc, + struct ieee80211_tx_info *tx_info, + struct tx_status *txs, u8 mcs) +{ + struct ieee80211_tx_rate *txrate = tx_info->status.rates; + int i; + + /* clear the rest of the rates */ + for (i = 2; i < IEEE80211_TX_MAX_RATES; i++) { + txrate[i].idx = -1; + txrate[i].count = 0; + } +} + +static void +brcms_c_ampdu_dotxstatus_complete(struct ampdu_info *ampdu, struct scb *scb, + struct sk_buff *p, struct tx_status *txs, + u32 s1, u32 s2) +{ + struct scb_ampdu *scb_ampdu; + struct brcms_c_info *wlc = ampdu->wlc; + struct scb_ampdu_tid_ini *ini; + u8 bitmap[8], queue, tid; + struct d11txh *txh; + u8 *plcp; + struct ieee80211_hdr *h; + u16 seq, start_seq = 0, bindex, index, mcl; + u8 mcs = 0; + bool ba_recd = false, ack_recd = false; + u8 suc_mpdu = 0, tot_mpdu = 0; + uint supr_status; + bool retry = true; + u16 mimoantsel = 0; + u8 retry_limit; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(p); + +#ifdef DEBUG + u8 hole[AMPDU_MAX_MPDU]; + memset(hole, 0, sizeof(hole)); +#endif + + scb_ampdu = &scb->scb_ampdu; + tid = (u8) (p->priority); + + ini = &scb_ampdu->ini[tid]; + retry_limit = ampdu->retry_limit_tid[tid]; + memset(bitmap, 0, sizeof(bitmap)); + queue = txs->frameid & TXFID_QUEUE_MASK; + supr_status = txs->status & TX_STATUS_SUPR_MASK; + + if (txs->status & TX_STATUS_ACK_RCV) { + WARN_ON(!(txs->status & TX_STATUS_INTERMEDIATE)); + start_seq = txs->sequence >> SEQNUM_SHIFT; + bitmap[0] = (txs->status & TX_STATUS_BA_BMAP03_MASK) >> + TX_STATUS_BA_BMAP03_SHIFT; + + WARN_ON(s1 & TX_STATUS_INTERMEDIATE); + WARN_ON(!(s1 & TX_STATUS_AMPDU)); + + bitmap[0] |= + (s1 & TX_STATUS_BA_BMAP47_MASK) << + TX_STATUS_BA_BMAP47_SHIFT; + bitmap[1] = (s1 >> 8) & 0xff; + bitmap[2] = (s1 >> 16) & 0xff; + bitmap[3] = (s1 >> 24) & 0xff; + + bitmap[4] = s2 & 0xff; + bitmap[5] = (s2 >> 8) & 0xff; + bitmap[6] = (s2 >> 16) & 0xff; + bitmap[7] = (s2 >> 24) & 0xff; + + ba_recd = true; + } else { + if (supr_status) { + if (supr_status == TX_STATUS_SUPR_BADCH) { + brcms_dbg_ht(wlc->hw->d11core, + "%s: Pkt tx suppressed, illegal channel possibly %d\n", + __func__, CHSPEC_CHANNEL( + wlc->default_bss->chanspec)); + } else { + if (supr_status != TX_STATUS_SUPR_FRAG) + brcms_err(wlc->hw->d11core, + "%s: supr_status 0x%x\n", + __func__, supr_status); + } + /* no need to retry for badch; will fail again */ + if (supr_status == TX_STATUS_SUPR_BADCH || + supr_status == TX_STATUS_SUPR_EXPTIME) { + retry = false; + } else if (supr_status == TX_STATUS_SUPR_EXPTIME) { + /* TX underflow: + * try tuning pre-loading or ampdu size + */ + } else if (supr_status == TX_STATUS_SUPR_FRAG) { + /* + * if there were underflows, but pre-loading + * is not active, notify rate adaptation. + */ + brcms_c_ffpld_check_txfunfl(wlc, queue); + } + } else if (txs->phyerr) { + brcms_dbg_ht(wlc->hw->d11core, + "%s: ampdu tx phy error (0x%x)\n", + __func__, txs->phyerr); + } + } + + /* loop through all pkts and retry if not acked */ + while (p) { + tx_info = IEEE80211_SKB_CB(p); + txh = (struct d11txh *) p->data; + mcl = le16_to_cpu(txh->MacTxControlLow); + plcp = (u8 *) (txh + 1); + h = (struct ieee80211_hdr *)(plcp + D11_PHY_HDR_LEN); + seq = le16_to_cpu(h->seq_ctrl) >> SEQNUM_SHIFT; + + trace_brcms_txdesc(&wlc->hw->d11core->dev, txh, sizeof(*txh)); + + if (tot_mpdu == 0) { + mcs = plcp[0] & MIMO_PLCP_MCS_MASK; + mimoantsel = le16_to_cpu(txh->ABI_MimoAntSel); + } + + index = TX_SEQ_TO_INDEX(seq); + ack_recd = false; + if (ba_recd) { + bindex = MODSUB_POW2(seq, start_seq, SEQNUM_MAX); + brcms_dbg_ht(wlc->hw->d11core, + "tid %d seq %d, start_seq %d, bindex %d set %d, index %d\n", + tid, seq, start_seq, bindex, + isset(bitmap, bindex), index); + /* if acked then clear bit and free packet */ + if ((bindex < AMPDU_TX_BA_MAX_WSIZE) + && isset(bitmap, bindex)) { + ini->txretry[index] = 0; + + /* + * ampdu_ack_len: + * number of acked aggregated frames + */ + /* ampdu_len: number of aggregated frames */ + brcms_c_ampdu_rate_status(wlc, tx_info, txs, + mcs); + tx_info->flags |= IEEE80211_TX_STAT_ACK; + tx_info->flags |= IEEE80211_TX_STAT_AMPDU; + tx_info->status.ampdu_ack_len = + tx_info->status.ampdu_len = 1; + + skb_pull(p, D11_PHY_HDR_LEN); + skb_pull(p, D11_TXH_LEN); + + ieee80211_tx_status_irqsafe(wlc->pub->ieee_hw, + p); + ack_recd = true; + suc_mpdu++; + } + } + /* either retransmit or send bar if ack not recd */ + if (!ack_recd) { + if (retry && (ini->txretry[index] < (int)retry_limit)) { + int ret; + ini->txretry[index]++; + ret = brcms_c_txfifo(wlc, queue, p); + /* + * We shouldn't be out of space in the DMA + * ring here since we're reinserting a frame + * that was just pulled out. + */ + WARN_ONCE(ret, "queue %d out of txds\n", queue); + } else { + /* Retry timeout */ + ieee80211_tx_info_clear_status(tx_info); + tx_info->status.ampdu_ack_len = 0; + tx_info->status.ampdu_len = 1; + tx_info->flags |= + IEEE80211_TX_STAT_AMPDU_NO_BACK; + skb_pull(p, D11_PHY_HDR_LEN); + skb_pull(p, D11_TXH_LEN); + brcms_dbg_ht(wlc->hw->d11core, + "BA Timeout, seq %d\n", + seq); + ieee80211_tx_status_irqsafe(wlc->pub->ieee_hw, + p); + } + } + tot_mpdu++; + + /* break out if last packet of ampdu */ + if (((mcl & TXC_AMPDU_MASK) >> TXC_AMPDU_SHIFT) == + TXC_AMPDU_LAST) + break; + + p = dma_getnexttxp(wlc->hw->di[queue], DMA_RANGE_TRANSMITTED); + } + + /* update rate state */ + brcms_c_antsel_antsel2id(wlc->asi, mimoantsel); +} + +void +brcms_c_ampdu_dotxstatus(struct ampdu_info *ampdu, struct scb *scb, + struct sk_buff *p, struct tx_status *txs) +{ + struct brcms_c_info *wlc = ampdu->wlc; + u32 s1 = 0, s2 = 0; + + /* BMAC_NOTE: For the split driver, second level txstatus comes later + * So if the ACK was received then wait for the second level else just + * call the first one + */ + if (txs->status & TX_STATUS_ACK_RCV) { + u8 status_delay = 0; + + /* wait till the next 8 bytes of txstatus is available */ + s1 = bcma_read32(wlc->hw->d11core, D11REGOFFS(frmtxstatus)); + while ((s1 & TXS_V) == 0) { + udelay(1); + status_delay++; + if (status_delay > 10) + return; /* error condition */ + s1 = bcma_read32(wlc->hw->d11core, + D11REGOFFS(frmtxstatus)); + } + + s2 = bcma_read32(wlc->hw->d11core, D11REGOFFS(frmtxstatus2)); + } + + if (scb) { + brcms_c_ampdu_dotxstatus_complete(ampdu, scb, p, txs, s1, s2); + } else { + /* loop through all pkts and free */ + u8 queue = txs->frameid & TXFID_QUEUE_MASK; + struct d11txh *txh; + u16 mcl; + while (p) { + txh = (struct d11txh *) p->data; + trace_brcms_txdesc(&wlc->hw->d11core->dev, txh, + sizeof(*txh)); + mcl = le16_to_cpu(txh->MacTxControlLow); + brcmu_pkt_buf_free_skb(p); + /* break out if last packet of ampdu */ + if (((mcl & TXC_AMPDU_MASK) >> TXC_AMPDU_SHIFT) == + TXC_AMPDU_LAST) + break; + p = dma_getnexttxp(wlc->hw->di[queue], + DMA_RANGE_TRANSMITTED); + } + } +} + +void brcms_c_ampdu_macaddr_upd(struct brcms_c_info *wlc) +{ + char template[T_RAM_ACCESS_SZ * 2]; + + /* driver needs to write the ta in the template; ta is at offset 16 */ + memset(template, 0, sizeof(template)); + memcpy(template, wlc->pub->cur_etheraddr, ETH_ALEN); + brcms_b_write_template_ram(wlc->hw, (T_BA_TPL_BASE + 16), + (T_RAM_ACCESS_SZ * 2), + template); +} + +bool brcms_c_aggregatable(struct brcms_c_info *wlc, u8 tid) +{ + return wlc->ampdu->ini_enable[tid]; +} + +void brcms_c_ampdu_shm_upd(struct ampdu_info *ampdu) +{ + struct brcms_c_info *wlc = ampdu->wlc; + + /* + * Extend ucode internal watchdog timer to + * match larger received frames + */ + if ((ampdu->rx_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) == + IEEE80211_HT_MAX_AMPDU_64K) { + brcms_b_write_shm(wlc->hw, M_MIMO_MAXSYM, MIMO_MAXSYM_MAX); + brcms_b_write_shm(wlc->hw, M_WATCHDOG_8TU, WATCHDOG_8TU_MAX); + } else { + brcms_b_write_shm(wlc->hw, M_MIMO_MAXSYM, MIMO_MAXSYM_DEF); + brcms_b_write_shm(wlc->hw, M_WATCHDOG_8TU, WATCHDOG_8TU_DEF); + } +} + +/* + * callback function that helps invalidating ampdu packets in a DMA queue + */ +static void dma_cb_fn_ampdu(void *txi, void *arg_a) +{ + struct ieee80211_sta *sta = arg_a; + struct ieee80211_tx_info *tx_info = (struct ieee80211_tx_info *)txi; + + if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && + (tx_info->rate_driver_data[0] == sta || sta == NULL)) + tx_info->rate_driver_data[0] = NULL; +} + +/* + * When a remote party is no longer available for ampdu communication, any + * pending tx ampdu packets in the driver have to be flushed. + */ +void brcms_c_ampdu_flush(struct brcms_c_info *wlc, + struct ieee80211_sta *sta, u16 tid) +{ + brcms_c_inval_dma_pkts(wlc->hw, sta, dma_cb_fn_ampdu); +} |