--- /dev/null
+/*
+ * 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, plcp3, is40, sgi, 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];
+ plcp3 = plcp[3];
+ } else {
+ plcp0 = txh->FragPLCPFallback[0];
+ plcp3 = txh->FragPLCPFallback[3];
+ }
+ is40 = (plcp0 & MIMO_PLCP_40MHZ) ? 1 : 0;
+ sgi = plcp3_issgi(plcp3) ? 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 update_rate = true, retry = true, tx_error = false;
+ u16 mimoantsel = 0;
+ u8 antselid = 0;
+ u8 retry_limit, rr_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];
+ rr_retry_limit = ampdu->rr_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) {
+ if (TX_STATUS_SUPR_UF == supr_status)
+ update_rate = false;
+
+ 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) {
+ update_rate = false;
+ 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.
+ */
+ if (brcms_c_ffpld_check_txfunfl(wlc, queue) > 0)
+ tx_error = true;
+ }
+ } else if (txs->phyerr) {
+ update_rate = false;
+ 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 */
+ antselid = 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 scb_ampdu *scb_ampdu;
+ struct brcms_c_info *wlc = ampdu->wlc;
+ struct scb_ampdu_tid_ini *ini;
+ u32 s1 = 0, s2 = 0;
+ struct ieee80211_tx_info *tx_info;
+
+ tx_info = IEEE80211_SKB_CB(p);
+
+ /* 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) {
+ scb_ampdu = &scb->scb_ampdu;
+ ini = &scb_ampdu->ini[p->priority];
+ 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) {
+ tx_info = IEEE80211_SKB_CB(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);
+}
Code Review / kvmfornfv.git / blobdiff