diff options
Diffstat (limited to 'drivers/net/wireless/ath9k/xmit.c')
| -rw-r--r-- | drivers/net/wireless/ath9k/xmit.c | 2807 |
1 files changed, 2807 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c new file mode 100644 index 000000000000..3a4757942b3f --- /dev/null +++ b/drivers/net/wireless/ath9k/xmit.c @@ -0,0 +1,2807 @@ +/* + * Copyright (c) 2008 Atheros Communications Inc. + * + * 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. + */ + +/* + * Implementation of transmit path. + */ + +#include "core.h" + +#define BITS_PER_BYTE 8 +#define OFDM_PLCP_BITS 22 +#define HT_RC_2_MCS(_rc) ((_rc) & 0x0f) +#define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1) +#define L_STF 8 +#define L_LTF 8 +#define L_SIG 4 +#define HT_SIG 8 +#define HT_STF 4 +#define HT_LTF(_ns) (4 * (_ns)) +#define SYMBOL_TIME(_ns) ((_ns) << 2) /* ns * 4 us */ +#define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) /* ns * 3.6 us */ +#define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2) +#define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18) + +#define OFDM_SIFS_TIME 16 + +static u32 bits_per_symbol[][2] = { + /* 20MHz 40MHz */ + { 26, 54 }, /* 0: BPSK */ + { 52, 108 }, /* 1: QPSK 1/2 */ + { 78, 162 }, /* 2: QPSK 3/4 */ + { 104, 216 }, /* 3: 16-QAM 1/2 */ + { 156, 324 }, /* 4: 16-QAM 3/4 */ + { 208, 432 }, /* 5: 64-QAM 2/3 */ + { 234, 486 }, /* 6: 64-QAM 3/4 */ + { 260, 540 }, /* 7: 64-QAM 5/6 */ + { 52, 108 }, /* 8: BPSK */ + { 104, 216 }, /* 9: QPSK 1/2 */ + { 156, 324 }, /* 10: QPSK 3/4 */ + { 208, 432 }, /* 11: 16-QAM 1/2 */ + { 312, 648 }, /* 12: 16-QAM 3/4 */ + { 416, 864 }, /* 13: 64-QAM 2/3 */ + { 468, 972 }, /* 14: 64-QAM 3/4 */ + { 520, 1080 }, /* 15: 64-QAM 5/6 */ +}; + +#define IS_HT_RATE(_rate) ((_rate) & 0x80) + +/* + * Insert a chain of ath_buf (descriptors) on a txq and + * assume the descriptors are already chained together by caller. + * NB: must be called with txq lock held + */ + +static void ath_tx_txqaddbuf(struct ath_softc *sc, + struct ath_txq *txq, struct list_head *head) +{ + struct ath_hal *ah = sc->sc_ah; + struct ath_buf *bf; + /* + * Insert the frame on the outbound list and + * pass it on to the hardware. + */ + + if (list_empty(head)) + return; + + bf = list_first_entry(head, struct ath_buf, list); + + list_splice_tail_init(head, &txq->axq_q); + txq->axq_depth++; + txq->axq_totalqueued++; + txq->axq_linkbuf = list_entry(txq->axq_q.prev, struct ath_buf, list); + + DPRINTF(sc, ATH_DBG_QUEUE, + "%s: txq depth = %d\n", __func__, txq->axq_depth); + + if (txq->axq_link == NULL) { + ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr); + DPRINTF(sc, ATH_DBG_XMIT, + "%s: TXDP[%u] = %llx (%p)\n", + __func__, txq->axq_qnum, + ito64(bf->bf_daddr), bf->bf_desc); + } else { + *txq->axq_link = bf->bf_daddr; + DPRINTF(sc, ATH_DBG_XMIT, "%s: link[%u] (%p)=%llx (%p)\n", + __func__, + txq->axq_qnum, txq->axq_link, + ito64(bf->bf_daddr), bf->bf_desc); + } + txq->axq_link = &(bf->bf_lastbf->bf_desc->ds_link); + ath9k_hw_txstart(ah, txq->axq_qnum); +} + +/* Get transmit rate index using rate in Kbps */ + +static int ath_tx_findindex(const struct ath9k_rate_table *rt, int rate) +{ + int i; + int ndx = 0; + + for (i = 0; i < rt->rateCount; i++) { + if (rt->info[i].rateKbps == rate) { + ndx = i; + break; + } + } + + return ndx; +} + +/* Check if it's okay to send out aggregates */ + +static int ath_aggr_query(struct ath_softc *sc, + struct ath_node *an, u8 tidno) +{ + struct ath_atx_tid *tid; + tid = ATH_AN_2_TID(an, tidno); + + if (tid->addba_exchangecomplete || tid->addba_exchangeinprogress) + return 1; + else + return 0; +} + +static enum ath9k_pkt_type get_hal_packet_type(struct ieee80211_hdr *hdr) +{ + enum ath9k_pkt_type htype; + __le16 fc; + + fc = hdr->frame_control; + + /* Calculate Atheros packet type from IEEE80211 packet header */ + + if (ieee80211_is_beacon(fc)) + htype = ATH9K_PKT_TYPE_BEACON; + else if (ieee80211_is_probe_resp(fc)) + htype = ATH9K_PKT_TYPE_PROBE_RESP; + else if (ieee80211_is_atim(fc)) + htype = ATH9K_PKT_TYPE_ATIM; + else if (ieee80211_is_pspoll(fc)) + htype = ATH9K_PKT_TYPE_PSPOLL; + else + htype = ATH9K_PKT_TYPE_NORMAL; + + return htype; +} + +static void fill_min_rates(struct sk_buff *skb, struct ath_tx_control *txctl) +{ + struct ieee80211_hdr *hdr; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + struct ath_tx_info_priv *tx_info_priv; + __le16 fc; + + hdr = (struct ieee80211_hdr *)skb->data; + fc = hdr->frame_control; + tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0]; + + if (ieee80211_is_mgmt(fc) || ieee80211_is_ctl(fc)) { + txctl->use_minrate = 1; + txctl->min_rate = tx_info_priv->min_rate; + } else if (ieee80211_is_data(fc)) { + if (ieee80211_is_nullfunc(fc) || + /* Port Access Entity (IEEE 802.1X) */ + (skb->protocol == cpu_to_be16(0x888E))) { + txctl->use_minrate = 1; + txctl->min_rate = tx_info_priv->min_rate; + } + if (is_multicast_ether_addr(hdr->addr1)) + txctl->mcast_rate = tx_info_priv->min_rate; + } + +} + +/* This function will setup additional txctl information, mostly rate stuff */ +/* FIXME: seqno, ps */ +static int ath_tx_prepare(struct ath_softc *sc, + struct sk_buff *skb, + struct ath_tx_control *txctl) +{ + struct ieee80211_hw *hw = sc->hw; + struct ieee80211_hdr *hdr; + struct ath_rc_series *rcs; + struct ath_txq *txq = NULL; + const struct ath9k_rate_table *rt; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + struct ath_tx_info_priv *tx_info_priv; + int hdrlen; + u8 rix, antenna; + __le16 fc; + u8 *qc; + + txctl->dev = sc; + hdr = (struct ieee80211_hdr *)skb->data; + hdrlen = ieee80211_get_hdrlen_from_skb(skb); + fc = hdr->frame_control; + + rt = sc->sc_currates; + BUG_ON(!rt); + + /* Fill misc fields */ + + spin_lock_bh(&sc->node_lock); + txctl->an = ath_node_get(sc, hdr->addr1); + /* create a temp node, if the node is not there already */ + if (!txctl->an) + txctl->an = ath_node_attach(sc, hdr->addr1, 0); + spin_unlock_bh(&sc->node_lock); + + if (ieee80211_is_data_qos(fc)) { + qc = ieee80211_get_qos_ctl(hdr); + txctl->tidno = qc[0] & 0xf; + } + + txctl->if_id = 0; + txctl->frmlen = skb->len + FCS_LEN - (hdrlen & 3); + txctl->txpower = MAX_RATE_POWER; /* FIXME */ + + /* Fill Key related fields */ + + txctl->keytype = ATH9K_KEY_TYPE_CLEAR; + txctl->keyix = ATH9K_TXKEYIX_INVALID; + + if (tx_info->control.hw_key) { + txctl->keyix = tx_info->control.hw_key->hw_key_idx; + txctl->frmlen += tx_info->control.hw_key->icv_len; + + if (tx_info->control.hw_key->alg == ALG_WEP) + txctl->keytype = ATH9K_KEY_TYPE_WEP; + else if (tx_info->control.hw_key->alg == ALG_TKIP) + txctl->keytype = ATH9K_KEY_TYPE_TKIP; + else if (tx_info->control.hw_key->alg == ALG_CCMP) + txctl->keytype = ATH9K_KEY_TYPE_AES; + } + + /* Fill packet type */ + + txctl->atype = get_hal_packet_type(hdr); + + /* Fill qnum */ + + if (unlikely(txctl->flags & ATH9K_TXDESC_CAB)) { + txctl->qnum = 0; + txq = sc->sc_cabq; + } else { + txctl->qnum = ath_get_hal_qnum(skb_get_queue_mapping(skb), sc); + txq = &sc->sc_txq[txctl->qnum]; + } + spin_lock_bh(&txq->axq_lock); + + /* Try to avoid running out of descriptors */ + if (txq->axq_depth >= (ATH_TXBUF - 20) && + !(txctl->flags & ATH9K_TXDESC_CAB)) { + DPRINTF(sc, ATH_DBG_FATAL, + "%s: TX queue: %d is full, depth: %d\n", + __func__, + txctl->qnum, + txq->axq_depth); + ieee80211_stop_queue(hw, skb_get_queue_mapping(skb)); + txq->stopped = 1; + spin_unlock_bh(&txq->axq_lock); + return -1; + } + + spin_unlock_bh(&txq->axq_lock); + + /* Fill rate */ + + fill_min_rates(skb, txctl); + + /* Fill flags */ + + txctl->flags |= ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */ + + if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK) + txctl->flags |= ATH9K_TXDESC_NOACK; + if (tx_info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) + txctl->flags |= ATH9K_TXDESC_RTSENA; + + /* + * Setup for rate calculations. + */ + tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0]; + rcs = tx_info_priv->rcs; + + if (ieee80211_is_data(fc) && !txctl->use_minrate) { + + /* Enable HT only for DATA frames and not for EAPOL */ + txctl->ht = (hw->conf.ht_conf.ht_supported && + (tx_info->flags & IEEE80211_TX_CTL_AMPDU)); + + if (is_multicast_ether_addr(hdr->addr1)) { + rcs[0].rix = (u8) + ath_tx_findindex(rt, txctl->mcast_rate); + + /* + * mcast packets are not re-tried. + */ + rcs[0].tries = 1; + } + /* For HT capable stations, we save tidno for later use. + * We also override seqno set by upper layer with the one + * in tx aggregation state. + * + * First, the fragmentation stat is determined. + * If fragmentation is on, the sequence number is + * not overridden, since it has been + * incremented by the fragmentation routine. + */ + if (likely(!(txctl->flags & ATH9K_TXDESC_FRAG_IS_ON)) && + txctl->ht && (sc->sc_flags & SC_OP_TXAGGR)) { + struct ath_atx_tid *tid; + + tid = ATH_AN_2_TID(txctl->an, txctl->tidno); + + hdr->seq_ctrl = cpu_to_le16(tid->seq_next << + IEEE80211_SEQ_SEQ_SHIFT); + txctl->seqno = tid->seq_next; + INCR(tid->seq_next, IEEE80211_SEQ_MAX); + } + } else { + /* for management and control frames, + * or for NULL and EAPOL frames */ + if (txctl->min_rate) + rcs[0].rix = ath_rate_findrateix(sc, txctl->min_rate); + else + rcs[0].rix = 0; + rcs[0].tries = ATH_MGT_TXMAXTRY; + } + rix = rcs[0].rix; + + if (ieee80211_has_morefrags(fc) || + (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) { + /* + ** Force hardware to use computed duration for next + ** fragment by disabling multi-rate retry, which + ** updates duration based on the multi-rate + ** duration table. + */ + rcs[1].tries = rcs[2].tries = rcs[3].tries = 0; + rcs[1].rix = rcs[2].rix = rcs[3].rix = 0; + /* reset tries but keep rate index */ + rcs[0].tries = ATH_TXMAXTRY; + } + + /* + * Determine if a tx interrupt should be generated for + * this descriptor. We take a tx interrupt to reap + * descriptors when the h/w hits an EOL condition or + * when the descriptor is specifically marked to generate + * an interrupt. We periodically mark descriptors in this + * way to insure timely replenishing of the supply needed + * for sending frames. Defering interrupts reduces system + * load and potentially allows more concurrent work to be + * done but if done to aggressively can cause senders to + * backup. + * + * NB: use >= to deal with sc_txintrperiod changing + * dynamically through sysctl. + */ + spin_lock_bh(&txq->axq_lock); + if ((++txq->axq_intrcnt >= sc->sc_txintrperiod)) { + txctl->flags |= ATH9K_TXDESC_INTREQ; + txq->axq_intrcnt = 0; + } + spin_unlock_bh(&txq->axq_lock); + + if (is_multicast_ether_addr(hdr->addr1)) { + antenna = sc->sc_mcastantenna + 1; + sc->sc_mcastantenna = (sc->sc_mcastantenna + 1) & 0x1; + } + + return 0; +} + +/* To complete a chain of buffers associated a frame */ + +static void ath_tx_complete_buf(struct ath_softc *sc, + struct ath_buf *bf, + struct list_head *bf_q, + int txok, int sendbar) +{ + struct sk_buff *skb = bf->bf_mpdu; + struct ath_xmit_status tx_status; + + /* + * Set retry information. + * NB: Don't use the information in the descriptor, because the frame + * could be software retried. + */ + tx_status.retries = bf->bf_retries; + tx_status.flags = 0; + + if (sendbar) + tx_status.flags = ATH_TX_BAR; + + if (!txok) { + tx_status.flags |= ATH_TX_ERROR; + + if (bf_isxretried(bf)) + tx_status.flags |= ATH_TX_XRETRY; + } + /* Unmap this frame */ + pci_unmap_single(sc->pdev, + bf->bf_dmacontext, + skb->len, + PCI_DMA_TODEVICE); + /* complete this frame */ + ath_tx_complete(sc, skb, &tx_status, bf->bf_node); + + /* + * Return the list of ath_buf of this mpdu to free queue + */ + spin_lock_bh(&sc->sc_txbuflock); + list_splice_tail_init(bf_q, &sc->sc_txbuf); + spin_unlock_bh(&sc->sc_txbuflock); +} + +/* + * queue up a dest/ac pair for tx scheduling + * NB: must be called with txq lock held + */ + +static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid) +{ + struct ath_atx_ac *ac = tid->ac; + + /* + * if tid is paused, hold off + */ + if (tid->paused) + return; + + /* + * add tid to ac atmost once + */ + if (tid->sched) + return; + + tid->sched = true; + list_add_tail(&tid->list, &ac->tid_q); + + /* + * add node ac to txq atmost once + */ + if (ac->sched) + return; + + ac->sched = true; + list_add_tail(&ac->list, &txq->axq_acq); +} + +/* pause a tid */ + +static void ath_tx_pause_tid(struct ath_softc *sc, struct ath_atx_tid *tid) +{ + struct ath_txq *txq = &sc->sc_txq[tid->ac->qnum]; + + spin_lock_bh(&txq->axq_lock); + + tid->paused++; + + spin_unlock_bh(&txq->axq_lock); +} + +/* resume a tid and schedule aggregate */ + +void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid) +{ + struct ath_txq *txq = &sc->sc_txq[tid->ac->qnum]; + + ASSERT(tid->paused > 0); + spin_lock_bh(&txq->axq_lock); + + tid->paused--; + + if (tid->paused > 0) + goto unlock; + + if (list_empty(&tid->buf_q)) + goto unlock; + + /* + * Add this TID to scheduler and try to send out aggregates + */ + ath_tx_queue_tid(txq, tid); + ath_txq_schedule(sc, txq); +unlock: + spin_unlock_bh(&txq->axq_lock); +} + +/* Compute the number of bad frames */ + +static int ath_tx_num_badfrms(struct ath_softc *sc, + struct ath_buf *bf, int txok) +{ + struct ath_node *an = bf->bf_node; + int isnodegone = (an->an_flags & ATH_NODE_CLEAN); + struct ath_buf *bf_last = bf->bf_lastbf; + struct ath_desc *ds = bf_last->bf_desc; + u16 seq_st = 0; + u32 ba[WME_BA_BMP_SIZE >> 5]; + int ba_index; + int nbad = 0; + int isaggr = 0; + + if (isnodegone || ds->ds_txstat.ts_flags == ATH9K_TX_SW_ABORTED) + return 0; + + isaggr = bf_isaggr(bf); + if (isaggr) { + seq_st = ATH_DS_BA_SEQ(ds); + memcpy(ba, ATH_DS_BA_BITMAP(ds), WME_BA_BMP_SIZE >> 3); + } + + while (bf) { + ba_index = ATH_BA_INDEX(seq_st, bf->bf_seqno); + if (!txok || (isaggr && !ATH_BA_ISSET(ba, ba_index))) + nbad++; + + bf = bf->bf_next; + } + + return nbad; +} + +static void ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf) +{ + struct sk_buff *skb; + struct ieee80211_hdr *hdr; + + bf->bf_state.bf_type |= BUF_RETRY; + bf->bf_retries++; + + skb = bf->bf_mpdu; + hdr = (struct ieee80211_hdr *)skb->data; + hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY); +} + +/* Update block ack window */ + +static void ath_tx_update_baw(struct ath_softc *sc, + struct ath_atx_tid *tid, int seqno) +{ + int index, cindex; + + index = ATH_BA_INDEX(tid->seq_start, seqno); + cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1); + + tid->tx_buf[cindex] = NULL; + + while (tid->baw_head != tid->baw_tail && !tid->tx_buf[tid->baw_head]) { + INCR(tid->seq_start, IEEE80211_SEQ_MAX); + INCR(tid->baw_head, ATH_TID_MAX_BUFS); + } +} + +/* + * ath_pkt_dur - compute packet duration (NB: not NAV) + * + * rix - rate index + * pktlen - total bytes (delims + data + fcs + pads + pad delims) + * width - 0 for 20 MHz, 1 for 40 MHz + * half_gi - to use 4us v/s 3.6 us for symbol time + */ + +static u32 ath_pkt_duration(struct ath_softc *sc, + u8 rix, + struct ath_buf *bf, + int width, + int half_gi, + bool shortPreamble) +{ + const struct ath9k_rate_table *rt = sc->sc_currates; + u32 nbits, nsymbits, duration, nsymbols; + u8 rc; + int streams, pktlen; + + pktlen = bf_isaggr(bf) ? bf->bf_al : bf->bf_frmlen; + rc = rt->info[rix].rateCode; + + /* + * for legacy rates, use old function to compute packet duration + */ + if (!IS_HT_RATE(rc)) + return ath9k_hw_computetxtime(sc->sc_ah, + rt, + pktlen, + rix, + shortPreamble); + /* + * find number of symbols: PLCP + data + */ + nbits = (pktlen << 3) + OFDM_PLCP_BITS; + nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; + nsymbols = (nbits + nsymbits - 1) / nsymbits; + + if (!half_gi) + duration = SYMBOL_TIME(nsymbols); + else + duration = SYMBOL_TIME_HALFGI(nsymbols); + + /* + * addup duration for legacy/ht training and signal fields + */ + streams = HT_RC_2_STREAMS(rc); + duration += L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams); + return duration; +} + +/* Rate module function to set rate related fields in tx descriptor */ + +static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf) +{ + struct ath_hal *ah = sc->sc_ah; + const struct ath9k_rate_table *rt; + struct ath_desc *ds = bf->bf_desc; + struct ath_desc *lastds = bf->bf_lastbf->bf_desc; + struct ath9k_11n_rate_series series[4]; + int i, flags, rtsctsena = 0, dynamic_mimops = 0; + u32 ctsduration = 0; + u8 rix = 0, cix, ctsrate = 0; + u32 aggr_limit_with_rts = ah->ah_caps.rts_aggr_limit; + struct ath_node *an = (struct ath_node *) bf->bf_node; + + /* + * get the cix for the lowest valid rix. + */ + rt = sc->sc_currates; + for (i = 4; i--;) { + if (bf->bf_rcs[i].tries) { + rix = bf->bf_rcs[i].rix; + break; + } + } + flags = (bf->bf_flags & (ATH9K_TXDESC_RTSENA | ATH9K_TXDESC_CTSENA)); + cix = rt->info[rix].controlRate; + + /* + * If 802.11g protection is enabled, determine whether + * to use RTS/CTS or just CTS. Note that this is only + * done for OFDM/HT unicast frames. + */ + if (sc->sc_protmode != PROT_M_NONE && + (rt->info[rix].phy == PHY_OFDM || + rt->info[rix].phy == PHY_HT) && + (bf->bf_flags & ATH9K_TXDESC_NOACK) == 0) { + if (sc->sc_protmode == PROT_M_RTSCTS) + flags = ATH9K_TXDESC_RTSENA; + else if (sc->sc_protmode == PROT_M_CTSONLY) + flags = ATH9K_TXDESC_CTSENA; + + cix = rt->info[sc->sc_protrix].controlRate; + rtsctsena = 1; + } + + /* For 11n, the default behavior is to enable RTS for + * hw retried frames. We enable the global flag here and + * let rate series flags determine which rates will actually + * use RTS. + */ + if ((ah->ah_caps.hw_caps & ATH9K_HW_CAP_HT) && bf_isdata(bf)) { + BUG_ON(!an); + /* + * 802.11g protection not needed, use our default behavior + */ + if (!rtsctsena) + flags = ATH9K_TXDESC_RTSENA; + /* + * For dynamic MIMO PS, RTS needs to precede the first aggregate + * and the second aggregate should have any protection at all. + */ + if (an->an_smmode == ATH_SM_PWRSAV_DYNAMIC) { + if (!bf_isaggrburst(bf)) { + flags = ATH9K_TXDESC_RTSENA; + dynamic_mimops = 1; + } else { + flags = 0; + } + } + } + + /* + * Set protection if aggregate protection on + */ + if (sc->sc_config.ath_aggr_prot && + (!bf_isaggr(bf) || (bf_isaggr(bf) && bf->bf_al < 8192))) { + flags = ATH9K_TXDESC_RTSENA; + cix = rt->info[sc->sc_protrix].controlRate; + rtsctsena = 1; + } + + /* + * For AR5416 - RTS cannot be followed by a frame larger than 8K. + */ + if (bf_isaggr(bf) && (bf->bf_al > aggr_limit_with_rts)) { + /* + * Ensure that in the case of SM Dynamic power save + * while we are bursting the second aggregate the + * RTS is cleared. + */ + flags &= ~(ATH9K_TXDESC_RTSENA); + } + + /* + * CTS transmit rate is derived from the transmit rate + * by looking in the h/w rate table. We must also factor + * in whether or not a short preamble is to be used. + */ + /* NB: cix is set above where RTS/CTS is enabled */ + BUG_ON(cix == 0xff); + ctsrate = rt->info[cix].rateCode | + (bf_isshpreamble(bf) ? rt->info[cix].shortPreamble : 0); + + /* + * Setup HAL rate series + */ + memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4); + + for (i = 0; i < 4; i++) { + if (!bf->bf_rcs[i].tries) + continue; + + rix = bf->bf_rcs[i].rix; + + series[i].Rate = rt->info[rix].rateCode | + (bf_isshpreamble(bf) ? rt->info[rix].shortPreamble : 0); + + series[i].Tries = bf->bf_rcs[i].tries; + + series[i].RateFlags = ( + (bf->bf_rcs[i].flags & ATH_RC_RTSCTS_FLAG) ? + ATH9K_RATESERIES_RTS_CTS : 0) | + ((bf->bf_rcs[i].flags & ATH_RC_CW40_FLAG) ? + ATH9K_RATESERIES_2040 : 0) | + ((bf->bf_rcs[i].flags & ATH_RC_SGI_FLAG) ? + ATH9K_RATESERIES_HALFGI : 0); + + series[i].PktDuration = ath_pkt_duration( + sc, rix, bf, + (bf->bf_rcs[i].flags & ATH_RC_CW40_FLAG) != 0, + (bf->bf_rcs[i].flags & ATH_RC_SGI_FLAG), + bf_isshpreamble(bf)); + + if ((an->an_smmode == ATH_SM_PWRSAV_STATIC) && + (bf->bf_rcs[i].flags & ATH_RC_DS_FLAG) == 0) { + /* + * When sending to an HT node that has enabled static + * SM/MIMO power save, send at single stream rates but + * use maximum allowed transmit chains per user, + * hardware, regulatory, or country limits for + * better range. + */ + series[i].ChSel = sc->sc_tx_chainmask; + } else { + if (bf_isht(bf)) + series[i].ChSel = + ath_chainmask_sel_logic(sc, an); + else + series[i].ChSel = sc->sc_tx_chainmask; + } + + if (rtsctsena) + series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS; + + /* + * Set RTS for all rates if node is in dynamic powersave + * mode and we are using dual stream rates. + */ + if (dynamic_mimops && (bf->bf_rcs[i].flags & ATH_RC_DS_FLAG)) + series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS; + } + + /* + * For non-HT devices, calculate RTS/CTS duration in software + * and disable multi-rate retry. + */ + if (flags && !(ah->ah_caps.hw_caps & ATH9K_HW_CAP_HT)) { + /* + * Compute the transmit duration based on the frame + * size and the size of an ACK frame. We call into the + * HAL to do the computation since it depends on the + * characteristics of the actual PHY being used. + * + * NB: CTS is assumed the same size as an ACK so we can + * use the precalculated ACK durations. + */ + if (flags & ATH9K_TXDESC_RTSENA) { /* SIFS + CTS */ + ctsduration += bf_isshpreamble(bf) ? + rt->info[cix].spAckDuration : + rt->info[cix].lpAckDuration; + } + + ctsduration += series[0].PktDuration; + + if ((bf->bf_flags & ATH9K_TXDESC_NOACK) == 0) { /* SIFS + ACK */ + ctsduration += bf_isshpreamble(bf) ? + rt->info[rix].spAckDuration : + rt->info[rix].lpAckDuration; + } + + /* + * Disable multi-rate retry when using RTS/CTS by clearing + * series 1, 2 and 3. + */ + memset(&series[1], 0, sizeof(struct ath9k_11n_rate_series) * 3); + } + + /* + * set dur_update_en for l-sig computation except for PS-Poll frames + */ + ath9k_hw_set11n_ratescenario(ah, ds, lastds, + !bf_ispspoll(bf), + ctsrate, + ctsduration, + series, 4, flags); + if (sc->sc_config.ath_aggr_prot && flags) + ath9k_hw_set11n_burstduration(ah, ds, 8192); +} + +/* + * Function to send a normal HT (non-AMPDU) frame + * NB: must be called with txq lock held + */ + +static int ath_tx_send_normal(struct ath_softc *sc, + struct ath_txq *txq, + struct ath_atx_tid *tid, + struct list_head *bf_head) +{ + struct ath_buf *bf; + struct sk_buff *skb; + struct ieee80211_tx_info *tx_info; + struct ath_tx_info_priv *tx_info_priv; + + BUG_ON(list_empty(bf_head)); + + bf = list_first_entry(bf_head, struct ath_buf, list); + bf->bf_state.bf_type &= ~BUF_AMPDU; /* regular HT frame */ + + skb = (struct sk_buff *)bf->bf_mpdu; + tx_info = IEEE80211_SKB_CB(skb); + tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0]; + memcpy(bf->bf_rcs, tx_info_priv->rcs, 4 * sizeof(tx_info_priv->rcs[0])); + + /* update starting sequence number for subsequent ADDBA request */ + INCR(tid->seq_start, IEEE80211_SEQ_MAX); + + /* Queue to h/w without aggregation */ + bf->bf_nframes = 1; + bf->bf_lastbf = bf->bf_lastfrm; /* one single frame */ + ath_buf_set_rate(sc, bf); + ath_tx_txqaddbuf(sc, txq, bf_head); + + return 0; +} + +/* flush tid's software queue and send frames as non-ampdu's */ + +static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid) +{ + struct ath_txq *txq = &sc->sc_txq[tid->ac->qnum]; + struct ath_buf *bf; + struct list_head bf_head; + INIT_LIST_HEAD(&bf_head); + + ASSERT(tid->paused > 0); + spin_lock_bh(&txq->axq_lock); + + tid->paused--; + + if (tid->paused > 0) { + spin_unlock_bh(&txq->axq_lock); + return; + } + + while (!list_empty(&tid->buf_q)) { + bf = list_first_entry(&tid->buf_q, struct ath_buf, list); + ASSERT(!bf_isretried(bf)); + list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list); + ath_tx_send_normal(sc, txq, tid, &bf_head); + } + + spin_unlock_bh(&txq->axq_lock); +} + +/* Completion routine of an aggregate */ + +static void ath_tx_complete_aggr_rifs(struct ath_softc *sc, + struct ath_txq *txq, + struct ath_buf *bf, + struct list_head *bf_q, + int txok) +{ + struct ath_node *an = bf->bf_node; + struct ath_atx_tid *tid = ATH_AN_2_TID(an, bf->bf_tidno); + struct ath_buf *bf_last = bf->bf_lastbf; + struct ath_desc *ds = bf_last->bf_desc; + struct ath_buf *bf_next, *bf_lastq = NULL; + struct list_head bf_head, bf_pending; + u16 seq_st = 0; + u32 ba[WME_BA_BMP_SIZE >> 5]; + int isaggr, txfail, txpending, sendbar = 0, needreset = 0; + int isnodegone = (an->an_flags & ATH_NODE_CLEAN); + + isaggr = bf_isaggr(bf); + if (isaggr) { + if (txok) { + if (ATH_DS_TX_BA(ds)) { + /* + * extract starting sequence and + * block-ack bitmap + */ + seq_st = ATH_DS_BA_SEQ(ds); + memcpy(ba, + ATH_DS_BA_BITMAP(ds), + WME_BA_BMP_SIZE >> 3); + } else { + memset(ba, 0, WME_BA_BMP_SIZE >> 3); + + /* + * AR5416 can become deaf/mute when BA + * issue happens. Chip needs to be reset. + * But AP code may have sychronization issues + * when perform internal reset in this routine. + * Only enable reset in STA mode for now. + */ + if (sc->sc_ah->ah_opmode == ATH9K_M_STA) + needreset = 1; + } + } else { + memset(ba, 0, WME_BA_BMP_SIZE >> 3); + } + } + + INIT_LIST_HEAD(&bf_pending); + INIT_LIST_HEAD(&bf_head); + + while (bf) { + txfail = txpending = 0; + bf_next = bf->bf_next; + + if (ATH_BA_ISSET(ba, ATH_BA_INDEX(seq_st, bf->bf_seqno))) { + /* transmit completion, subframe is + * acked by block ack */ + } else if (!isaggr && txok) { + /* transmit completion */ + } else { + + if (!tid->cleanup_inprogress && !isnodegone && + ds->ds_txstat.ts_flags != ATH9K_TX_SW_ABORTED) { + if (bf->bf_retries < ATH_MAX_SW_RETRIES) { + ath_tx_set_retry(sc, bf); + txpending = 1; + } else { + bf->bf_state.bf_type |= BUF_XRETRY; + txfail = 1; + sendbar = 1; + } + } else { + /* + * cleanup in progress, just fail + * the un-acked sub-frames + */ + txfail = 1; + } + } + /* + * Remove ath_buf's of this sub-frame from aggregate queue. + */ + if (bf_next == NULL) { /* last subframe in the aggregate */ + ASSERT(bf->bf_lastfrm == bf_last); + + /* + * The last descriptor of the last sub frame could be + * a holding descriptor for h/w. If that's the case, + * bf->bf_lastfrm won't be in the bf_q. + * Make sure we handle bf_q properly here. + */ + + if (!list_empty(bf_q)) { + bf_lastq = list_entry(bf_q->prev, + struct ath_buf, list); + list_cut_position(&bf_head, + bf_q, &bf_lastq->list); + } else { + /* + * XXX: if the last subframe only has one + * descriptor which is also being used as + * a holding descriptor. Then the ath_buf + * is not in the bf_q at all. + */ + INIT_LIST_HEAD(&bf_head); + } + } else { + ASSERT(!list_empty(bf_q)); + list_cut_position(&bf_head, + bf_q, &bf->bf_lastfrm->list); + } + + if (!txpending) { + /* + * complete the acked-ones/xretried ones; update + * block-ack window + */ + spin_lock_bh(&txq->axq_lock); + ath_tx_update_baw(sc, tid, bf->bf_seqno); + spin_unlock_bh(&txq->axq_lock); + + /* complete this sub-frame */ + ath_tx_complete_buf(sc, bf, &bf_head, !txfail, sendbar); + } else { + /* + * retry the un-acked ones + */ + /* + * XXX: if the last descriptor is holding descriptor, + * in order to requeue the frame to software queue, we + * need to allocate a new descriptor and + * copy the content of holding descriptor to it. + */ + if (bf->bf_next == NULL && + bf_last->bf_status & ATH_BUFSTATUS_STALE) { + struct ath_buf *tbf; + + /* allocate new descriptor */ + spin_lock_bh(&sc->sc_txbuflock); + ASSERT(!list_empty((&sc->sc_txbuf))); + tbf = list_first_entry(&sc->sc_txbuf, + struct ath_buf, list); + list_del(&tbf->list); + spin_unlock_bh(&sc->sc_txbuflock); + + ATH_TXBUF_RESET(tbf); + + /* copy descriptor content */ + tbf->bf_mpdu = bf_last->bf_mpdu; + tbf->bf_node = bf_last->bf_node; + tbf->bf_buf_addr = bf_last->bf_buf_addr; + *(tbf->bf_desc) = *(bf_last->bf_desc); + + /* link it to the frame */ + if (bf_lastq) { + bf_lastq->bf_desc->ds_link = + tbf->bf_daddr; + bf->bf_lastfrm = tbf; + ath9k_hw_cleartxdesc(sc->sc_ah, + bf->bf_lastfrm->bf_desc); + } else { + tbf->bf_state = bf_last->bf_state; + tbf->bf_lastfrm = tbf; + ath9k_hw_cleartxdesc(sc->sc_ah, + tbf->bf_lastfrm->bf_desc); + + /* copy the DMA context */ + tbf->bf_dmacontext = + bf_last->bf_dmacontext; + } + list_add_tail(&tbf->list, &bf_head); + } else { + /* + * Clear descriptor status words for + * software retry + */ + ath9k_hw_cleartxdesc(sc->sc_ah, + bf->bf_lastfrm->bf_desc); + } + + /* + * Put this buffer to the temporary pending + * queue to retain ordering + */ + list_splice_tail_init(&bf_head, &bf_pending); + } + + bf = bf_next; + } + + /* + * node is already gone. no more assocication + * with the node. the node might have been freed + * any node acces can result in panic.note tid + * is part of the node. + */ + if (isnodegone) + return; + + if (tid->cleanup_inprogress) { + /* check to see if we're done with cleaning the h/w queue */ + spin_lock_bh(&txq->axq_lock); + + if (tid->baw_head == tid->baw_tail) { + tid->addba_exchangecomplete = 0; + tid->addba_exchangeattempts = 0; + spin_unlock_bh(&txq->axq_lock); + + tid->cleanup_inprogress = false; + + /* send buffered frames as singles */ + ath_tx_flush_tid(sc, tid); + } else + spin_unlock_bh(&txq->axq_lock); + + return; + } + + /* + * prepend un-acked frames to the beginning of the pending frame queue + */ + if (!list_empty(&bf_pending)) { + spin_lock_bh(&txq->axq_lock); + /* Note: we _prepend_, we _do_not_ at to + * the end of the queue ! */ + list_splice(&bf_pending, &tid->buf_q); + ath_tx_queue_tid(txq, tid); + spin_unlock_bh(&txq->axq_lock); + } + + if (needreset) + ath_reset(sc, false); + + return; +} + +/* Process completed xmit descriptors from the specified queue */ + +static int ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq) +{ + struct ath_hal *ah = sc->sc_ah; + struct ath_buf *bf, *lastbf, *bf_held = NULL; + struct list_head bf_head; + struct ath_desc *ds, *tmp_ds; + struct sk_buff *skb; + struct ieee80211_tx_info *tx_info; + struct ath_tx_info_priv *tx_info_priv; + int nacked, txok, nbad = 0, isrifs = 0; + int status; + + DPRINTF(sc, ATH_DBG_QUEUE, + "%s: tx queue %d (%x), link %p\n", __func__, + txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum), + txq->axq_link); + + nacked = 0; + for (;;) { + spin_lock_bh(&txq->axq_lock); + txq->axq_intrcnt = 0; /* reset periodic desc intr count */ + if (list_empty(&txq->axq_q)) { + txq->axq_link = NULL; + txq->axq_linkbuf = NULL; + spin_unlock_bh(&txq->axq_lock); + break; + } + bf = list_first_entry(&txq->axq_q, struct ath_buf, list); + + /* + * There is a race condition that a BH gets scheduled + * after sw writes TxE and before hw re-load the last + * descriptor to get the newly chained one. + * Software must keep the last DONE descriptor as a + * holding descriptor - software does so by marking + * it with the STALE flag. + */ + bf_held = NULL; + if (bf->bf_status & ATH_BUFSTATUS_STALE) { + bf_held = bf; + if (list_is_last(&bf_held->list, &txq->axq_q)) { + /* FIXME: + * The holding descriptor is the last + * descriptor in queue. It's safe to remove + * the last holding descriptor in BH context. + */ + spin_unlock_bh(&txq->axq_lock); + break; + } else { + /* Lets work with the next buffer now */ + bf = list_entry(bf_held->list.next, + struct ath_buf, list); + } + } + + lastbf = bf->bf_lastbf; + ds = lastbf->bf_desc; /* NB: last decriptor */ + + status = ath9k_hw_txprocdesc(ah, ds); + if (status == -EINPROGRESS) { + spin_unlock_bh(&txq->axq_lock); + break; + } + if (bf->bf_desc == txq->axq_lastdsWithCTS) + txq->axq_lastdsWithCTS = NULL; + if (ds == txq->axq_gatingds) + txq->axq_gatingds = NULL; + + /* + * Remove ath_buf's of the same transmit unit from txq, + * however leave the last descriptor back as the holding + * descriptor for hw. + */ + lastbf->bf_status |= ATH_BUFSTATUS_STALE; + INIT_LIST_HEAD(&bf_head); + + if (!list_is_singular(&lastbf->list)) + list_cut_position(&bf_head, + &txq->axq_q, lastbf->list.prev); + + txq->axq_depth--; + + if (bf_isaggr(bf)) + txq->axq_aggr_depth--; + + txok = (ds->ds_txstat.ts_status == 0); + + spin_unlock_bh(&txq->axq_lock); + + if (bf_held) { + list_del(&bf_held->list); + spin_lock_bh(&sc->sc_txbuflock); + list_add_tail(&bf_held->list, &sc->sc_txbuf); + spin_unlock_bh(&sc->sc_txbuflock); + } + + if (!bf_isampdu(bf)) { + /* + * This frame is sent out as a single frame. + * Use hardware retry status for this frame. + */ + bf->bf_retries = ds->ds_txstat.ts_longretry; + if (ds->ds_txstat.ts_status & ATH9K_TXERR_XRETRY) + bf->bf_state.bf_type |= BUF_XRETRY; + nbad = 0; + } else { + nbad = ath_tx_num_badfrms(sc, bf, txok); + } + skb = bf->bf_mpdu; + tx_info = IEEE80211_SKB_CB(skb); + tx_info_priv = (struct ath_tx_info_priv *) + tx_info->driver_data[0]; + if (ds->ds_txstat.ts_status & ATH9K_TXERR_FILT) + tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED; + if ((ds->ds_txstat.ts_status & ATH9K_TXERR_FILT) == 0 && + (bf->bf_flags & ATH9K_TXDESC_NOACK) == 0) { + if (ds->ds_txstat.ts_status == 0) + nacked++; + + if (bf_isdata(bf)) { + if (isrifs) + tmp_ds = bf->bf_rifslast->bf_desc; + else + tmp_ds = ds; + memcpy(&tx_info_priv->tx, + &tmp_ds->ds_txstat, + sizeof(tx_info_priv->tx)); + tx_info_priv->n_frames = bf->bf_nframes; + tx_info_priv->n_bad_frames = nbad; + } + } + + /* + * Complete this transmit unit + */ + if (bf_isampdu(bf)) + ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, txok); + else + ath_tx_complete_buf(sc, bf, &bf_head, txok, 0); + + /* Wake up mac80211 queue */ + + spin_lock_bh(&txq->axq_lock); + if (txq->stopped && ath_txq_depth(sc, txq->axq_qnum) <= + (ATH_TXBUF - 20)) { + int qnum; + qnum = ath_get_mac80211_qnum(txq->axq_qnum, sc); + if (qnum != -1) { + ieee80211_wake_queue(sc->hw, qnum); + txq->stopped = 0; + } + + } + + /* + * schedule any pending packets if aggregation is enabled + */ + if (sc->sc_flags & SC_OP_TXAGGR) + ath_txq_schedule(sc, txq); + spin_unlock_bh(&txq->axq_lock); + } + return nacked; +} + +static void ath_tx_stopdma(struct ath_softc *sc, struct ath_txq *txq) +{ + struct ath_hal *ah = sc->sc_ah; + + (void) ath9k_hw_stoptxdma(ah, txq->axq_qnum); + DPRINTF(sc, ATH_DBG_XMIT, "%s: tx queue [%u] %x, link %p\n", + __func__, txq->axq_qnum, + ath9k_hw_gettxbuf(ah, txq->axq_qnum), txq->axq_link); +} + +/* Drain only the data queues */ + +static void ath_drain_txdataq(struct ath_softc *sc, bool retry_tx) +{ + struct ath_hal *ah = sc->sc_ah; + int i; + int npend = 0; + + /* XXX return value */ + if (!(sc->sc_flags & SC_OP_INVALID)) { + for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) { + if (ATH_TXQ_SETUP(sc, i)) { + ath_tx_stopdma(sc, &sc->sc_txq[i]); + + /* The TxDMA may not really be stopped. + * Double check the hal tx pending count */ + npend += ath9k_hw_numtxpending(ah, + sc->sc_txq[i].axq_qnum); + } + } + } + + if (npend) { + int status; + + /* TxDMA not stopped, reset the hal */ + DPRINTF(sc, ATH_DBG_XMIT, + "%s: Unable to stop TxDMA. Reset HAL!\n", __func__); + + spin_lock_bh(&sc->sc_resetlock); + if (!ath9k_hw_reset(ah, + sc->sc_ah->ah_curchan, + sc->sc_ht_info.tx_chan_width, + sc->sc_tx_chainmask, sc->sc_rx_chainmask, + sc->sc_ht_extprotspacing, true, &status)) { + + DPRINTF(sc, ATH_DBG_FATAL, + "%s: unable to reset hardware; hal status %u\n", + __func__, + status); + } + spin_unlock_bh(&sc->sc_resetlock); + } + + for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) { + if (ATH_TXQ_SETUP(sc, i)) + ath_tx_draintxq(sc, &sc->sc_txq[i], retry_tx); + } +} + +/* Add a sub-frame to block ack window */ + +static void ath_tx_addto_baw(struct ath_softc *sc, + struct ath_atx_tid *tid, + struct ath_buf *bf) +{ + int index, cindex; + + if (bf_isretried(bf)) + return; + + index = ATH_BA_INDEX(tid->seq_start, bf->bf_seqno); + cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1); + + ASSERT(tid->tx_buf[cindex] == NULL); + tid->tx_buf[cindex] = bf; + + if (index >= ((tid->baw_tail - tid->baw_head) & + (ATH_TID_MAX_BUFS - 1))) { + tid->baw_tail = cindex; + INCR(tid->baw_tail, ATH_TID_MAX_BUFS); + } +} + +/* + * Function to send an A-MPDU + * NB: must be called with txq lock held + */ + +static int ath_tx_send_ampdu(struct ath_softc *sc, + struct ath_txq *txq, + struct ath_atx_tid *tid, + struct list_head *bf_head, + struct ath_tx_control *txctl) +{ + struct ath_buf *bf; + struct sk_buff *skb; + struct ieee80211_tx_info *tx_info; + struct ath_tx_info_priv *tx_info_priv; + + BUG_ON(list_empty(bf_head)); + + bf = list_first_entry(bf_head, struct ath_buf, list); + bf->bf_state.bf_type |= BUF_AMPDU; + bf->bf_seqno = txctl->seqno; /* save seqno and tidno in buffer */ + bf->bf_tidno = txctl->tidno; + + /* + * Do not queue to h/w when any of the following conditions is true: + * - there are pending frames in software queue + * - the TID is currently paused for ADDBA/BAR request + * - seqno is not within block-ack window + * - h/w queue depth exceeds low water mark + */ + if (!list_empty(&tid->buf_q) || tid->paused || + !BAW_WITHIN(tid->seq_start, tid->baw_size, bf->bf_seqno) || + txq->axq_depth >= ATH_AGGR_MIN_QDEPTH) { + /* + * Add this frame to software queue for scheduling later + * for aggregation. + */ + list_splice_tail_init(bf_head, &tid->buf_q); + ath_tx_queue_tid(txq, tid); + return 0; + } + + skb = (struct sk_buff *)bf->bf_mpdu; + tx_info = IEEE80211_SKB_CB(skb); + tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0]; + memcpy(bf->bf_rcs, tx_info_priv->rcs, 4 * sizeof(tx_info_priv->rcs[0])); + + /* Add sub-frame to BAW */ + ath_tx_addto_baw(sc, tid, bf); + + /* Queue to h/w without aggregation */ + bf->bf_nframes = 1; + bf->bf_lastbf = bf->bf_lastfrm; /* one single frame */ + ath_buf_set_rate(sc, bf); + ath_tx_txqaddbuf(sc, txq, bf_head); + return 0; +} + +/* + * looks up the rate + * returns aggr limit based on lowest of the rates + */ + +static u32 ath_lookup_rate(struct ath_softc *sc, + struct ath_buf *bf) +{ + const struct ath9k_rate_table *rt = sc->sc_currates; + struct sk_buff *skb; + struct ieee80211_tx_info *tx_info; + struct ath_tx_info_priv *tx_info_priv; + u32 max_4ms_framelen, frame_length; + u16 aggr_limit, legacy = 0, maxampdu; + int i; + + + skb = (struct sk_buff *)bf->bf_mpdu; + tx_info = IEEE80211_SKB_CB(skb); + tx_info_priv = (struct ath_tx_info_priv *) + tx_info->driver_data[0]; + memcpy(bf->bf_rcs, + tx_info_priv->rcs, 4 * sizeof(tx_info_priv->rcs[0])); + + /* + * Find the lowest frame length among the rate series that will have a + * 4ms transmit duration. + * TODO - TXOP limit needs to be considered. + */ + max_4ms_framelen = ATH_AMPDU_LIMIT_MAX; + + for (i = 0; i < 4; i++) { + if (bf->bf_rcs[i].tries) { + frame_length = bf->bf_rcs[i].max_4ms_framelen; + + if (rt->info[bf->bf_rcs[i].rix].phy != PHY_HT) { + legacy = 1; + break; + } + + max_4ms_framelen = min(max_4ms_framelen, frame_length); + } + } + + /* + * limit aggregate size by the minimum rate if rate selected is + * not a probe rate, if rate selected is a probe rate then + * avoid aggregation of this packet. + */ + if (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE || legacy) + return 0; + + aggr_limit = min(max_4ms_framelen, + (u32)ATH_AMPDU_LIMIT_DEFAULT); + + /* + * h/w can accept aggregates upto 16 bit lengths (65535). + * The IE, however can hold upto 65536, which shows up here + * as zero. Ignore 65536 since we are constrained by hw. + */ + maxampdu = sc->sc_ht_info.maxampdu; + if (maxampdu) + aggr_limit = min(aggr_limit, maxampdu); + + return aggr_limit; +} + +/* + * returns the number of delimiters to be added to + * meet the minimum required mpdudensity. + * caller should make sure that the rate is HT rate . + */ + +static int ath_compute_num_delims(struct ath_softc *sc, + struct ath_buf *bf, + u16 frmlen) +{ + const struct ath9k_rate_table *rt = sc->sc_currates; + u32 nsymbits, nsymbols, mpdudensity; + u16 minlen; + u8 rc, flags, rix; + int width, half_gi, ndelim, mindelim; + + /* Select standard number of delimiters based on frame length alone */ + ndelim = ATH_AGGR_GET_NDELIM(frmlen); + + /* + * If encryption enabled, hardware requires some more padding between + * subframes. + * TODO - this could be improved to be dependent on the rate. + * The hardware can keep up at lower rates, but not higher rates + */ + if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR) + ndelim += ATH_AGGR_ENCRYPTDELIM; + + /* + * Convert desired mpdu density from microeconds to bytes based + * on highest rate in rate series (i.e. first rate) to determine + * required minimum length for subframe. Take into account + * whether high rate is 20 or 40Mhz and half or full GI. + */ + mpdudensity = sc->sc_ht_info.mpdudensity; + + /* + * If there is no mpdu density restriction, no further calculation + * is needed. + */ + if (mpdudensity == 0) + return ndelim; + + rix = bf->bf_rcs[0].rix; + flags = bf->bf_rcs[0].flags; + rc = rt->info[rix].rateCode; + width = (flags & ATH_RC_CW40_FLAG) ? 1 : 0; + half_gi = (flags & ATH_RC_SGI_FLAG) ? 1 : 0; + + if (half_gi) + nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity); + else + nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity); + + if (nsymbols == 0) + nsymbols = 1; + + nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; + minlen = (nsymbols * nsymbits) / BITS_PER_BYTE; + + /* Is frame shorter than required minimum length? */ + if (frmlen < minlen) { + /* Get the minimum number of delimiters required. */ + mindelim = (minlen - frmlen) / ATH_AGGR_DELIM_SZ; + ndelim = max(mindelim, ndelim); + } + + return ndelim; +} + +/* + * For aggregation from software buffer queue. + * NB: must be called with txq lock held + */ + +static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc, + struct ath_atx_tid *tid, + struct list_head *bf_q, + struct ath_buf **bf_last, + struct aggr_rifs_param *param, + int *prev_frames) +{ +#define PADBYTES(_len) ((4 - ((_len) % 4)) % 4) + struct ath_buf *bf, *tbf, *bf_first, *bf_prev = NULL; + struct list_head bf_head; + int rl = 0, nframes = 0, ndelim; + u16 aggr_limit = 0, al = 0, bpad = 0, + al_delta, h_baw = tid->baw_size / 2; + enum ATH_AGGR_STATUS status = ATH_AGGR_DONE; + int prev_al = 0, is_ds_rate = 0; + INIT_LIST_HEAD(&bf_head); + + BUG_ON(list_empty(&tid->buf_q)); + + bf_first = list_first_entry(&tid->buf_q, struct ath_buf, list); + + do { + bf = list_first_entry(&tid->buf_q, struct ath_buf, list); + + /* + * do not step over block-ack window + */ + if (!BAW_WITHIN(tid->seq_start, tid->baw_size, bf->bf_seqno)) { + status = ATH_AGGR_BAW_CLOSED; + break; + } + + if (!rl) { + aggr_limit = ath_lookup_rate(sc, bf); + rl = 1; + /* + * Is rate dual stream + */ + is_ds_rate = + (bf->bf_rcs[0].flags & ATH_RC_DS_FLAG) ? 1 : 0; + } + + /* + * do not exceed aggregation limit + */ + al_delta = ATH_AGGR_DELIM_SZ + bf->bf_frmlen; + + if (nframes && (aggr_limit < + (al + bpad + al_delta + prev_al))) { + status = ATH_AGGR_LIMITED; + break; + } + + /* + * do not exceed subframe limit + */ + if ((nframes + *prev_frames) >= + min((int)h_baw, ATH_AMPDU_SUBFRAME_DEFAULT)) { + status = ATH_AGGR_LIMITED; + break; + } + + /* + * add padding for previous frame to aggregation length + */ + al += bpad + al_delta; + + /* + * Get the delimiters needed to meet the MPDU + * density for this node. + */ + ndelim = ath_compute_num_delims(sc, bf_first, bf->bf_frmlen); + + bpad = PADBYTES(al_delta) + (ndelim << 2); + + bf->bf_next = NULL; + bf->bf_lastfrm->bf_desc->ds_link = 0; + + /* + * this packet is part of an aggregate + * - remove all descriptors belonging to this frame from + * software queue + * - add it to block ack window + * - set up descriptors for aggregation + */ + list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list); + ath_tx_addto_baw(sc, tid, bf); + + list_for_each_entry(tbf, &bf_head, list) { + ath9k_hw_set11n_aggr_middle(sc->sc_ah, + tbf->bf_desc, ndelim); + } + + /* + * link buffers of this frame to the aggregate + */ + list_splice_tail_init(&bf_head, bf_q); + nframes++; + + if (bf_prev) { + bf_prev->bf_next = bf; + bf_prev->bf_lastfrm->bf_desc->ds_link = bf->bf_daddr; + } + bf_prev = bf; + +#ifdef AGGR_NOSHORT + /* + * terminate aggregation on a small packet boundary + */ + if (bf->bf_frmlen < ATH_AGGR_MINPLEN) { + status = ATH_AGGR_SHORTPKT; + break; + } +#endif + } while (!list_empty(&tid->buf_q)); + + bf_first->bf_al = al; + bf_first->bf_nframes = nframes; + *bf_last = bf_prev; + return status; +#undef PADBYTES +} + +/* + * process pending frames possibly doing a-mpdu aggregation + * NB: must be called with txq lock held + */ + +static void ath_tx_sched_aggr(struct ath_softc *sc, + struct ath_txq *txq, struct ath_atx_tid *tid) +{ + struct ath_buf *bf, *tbf, *bf_last, *bf_lastaggr = NULL; + enum ATH_AGGR_STATUS status; + struct list_head bf_q; + struct aggr_rifs_param param = {0, 0, 0, 0, NULL}; + int prev_frames = 0; + + do { + if (list_empty(&tid->buf_q)) + return; + + INIT_LIST_HEAD(&bf_q); + + status = ath_tx_form_aggr(sc, tid, &bf_q, &bf_lastaggr, ¶m, + &prev_frames); + + /* + * no frames picked up to be aggregated; block-ack + * window is not open + */ + if (list_empty(&bf_q)) + break; + + bf = list_first_entry(&bf_q, struct ath_buf, list); + bf_last = list_entry(bf_q.prev, struct ath_buf, list); + bf->bf_lastbf = bf_last; + + /* + * if only one frame, send as non-aggregate + */ + if (bf->bf_nframes == 1) { + ASSERT(bf->bf_lastfrm == bf_last); + + bf->bf_state.bf_type &= ~BUF_AGGR; + /* + * clear aggr bits for every descriptor + * XXX TODO: is there a way to optimize it? + */ + list_for_each_entry(tbf, &bf_q, list) { + ath9k_hw_clr11n_aggr(sc->sc_ah, tbf->bf_desc); + } + + ath_buf_set_rate(sc, bf); + ath_tx_txqaddbuf(sc, txq, &bf_q); + continue; + } + + /* + * setup first desc with rate and aggr info + */ + bf->bf_state.bf_type |= BUF_AGGR; + ath_buf_set_rate(sc, bf); + ath9k_hw_set11n_aggr_first(sc->sc_ah, bf->bf_desc, bf->bf_al); + + /* + * anchor last frame of aggregate correctly + */ + ASSERT(bf_lastaggr); + ASSERT(bf_lastaggr->bf_lastfrm == bf_last); + tbf = bf_lastaggr; + ath9k_hw_set11n_aggr_last(sc->sc_ah, tbf->bf_desc); + + /* XXX: We don't enter into this loop, consider removing this */ + while (!list_empty(&bf_q) && !list_is_last(&tbf->list, &bf_q)) { + tbf = list_entry(tbf->list.next, struct ath_buf, list); + ath9k_hw_set11n_aggr_last(sc->sc_ah, tbf->bf_desc); + } + + txq->axq_aggr_depth++; + + /* + * Normal aggregate, queue to hardware + */ + ath_tx_txqaddbuf(sc, txq, &bf_q); + + } while (txq->axq_depth < ATH_AGGR_MIN_QDEPTH && + status != ATH_AGGR_BAW_CLOSED); +} + +/* Called with txq lock held */ + +static void ath_tid_drain(struct ath_softc *sc, + struct ath_txq *txq, + struct ath_atx_tid *tid, + bool bh_flag) +{ + struct ath_buf *bf; + struct list_head bf_head; + INIT_LIST_HEAD(&bf_head); + + for (;;) { + if (list_empty(&tid->buf_q)) + break; + bf = list_first_entry(&tid->buf_q, struct ath_buf, list); + + list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list); + + /* update baw for software retried frame */ + if (bf_isretried(bf)) + ath_tx_update_baw(sc, tid, bf->bf_seqno); + + /* + * do not indicate packets while holding txq spinlock. + * unlock is intentional here + */ + if (likely(bh_flag)) + spin_unlock_bh(&txq->axq_lock); + else + spin_unlock(&txq->axq_lock); + + /* complete this sub-frame */ + ath_tx_complete_buf(sc, bf, &bf_head, 0, 0); + + if (likely(bh_flag)) + spin_lock_bh(&txq->axq_lock); + else + spin_lock(&txq->axq_lock); + } + + /* + * TODO: For frame(s) that are in the retry state, we will reuse the + * sequence number(s) without setting the retry bit. The + * alternative is to give up on these and BAR the receiver's window + * forward. + */ + tid->seq_next = tid->seq_start; + tid->baw_tail = tid->baw_head; +} + +/* + * Drain all pending buffers + * NB: must be called with txq lock held + */ + +static void ath_txq_drain_pending_buffers(struct ath_softc *sc, + struct ath_txq *txq, + bool bh_flag) +{ + struct ath_atx_ac *ac, *ac_tmp; + struct ath_atx_tid *tid, *tid_tmp; + + list_for_each_entry_safe(ac, ac_tmp, &txq->axq_acq, list) { + list_del(&ac->list); + ac->sched = false; + list_for_each_entry_safe(tid, tid_tmp, &ac->tid_q, list) { + list_del(&tid->list); + tid->sched = false; + ath_tid_drain(sc, txq, tid, bh_flag); + } + } +} + +static int ath_tx_start_dma(struct ath_softc *sc, + struct sk_buff *skb, + struct scatterlist *sg, + u32 n_sg, + struct ath_tx_control *txctl) +{ + struct ath_node *an = txctl->an; + struct ath_buf *bf = NULL; + struct list_head bf_head; + struct ath_desc *ds; + struct ath_hal *ah = sc->sc_ah; + struct ath_txq *txq; + struct ath_tx_info_priv *tx_info_priv; + struct ath_rc_series *rcs; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + __le16 fc = hdr->frame_control; + + if (unlikely(txctl->flags & ATH9K_TXDESC_CAB)) + txq = sc->sc_cabq; + else + txq = &sc->sc_txq[txctl->qnum]; + + /* For each sglist entry, allocate an ath_buf for DMA */ + INIT_LIST_HEAD(&bf_head); + spin_lock_bh(&sc->sc_txbuflock); + if (unlikely(list_empty(&sc->sc_txbuf))) { + spin_unlock_bh(&sc->sc_txbuflock); + return -ENOMEM; + } + + bf = list_first_entry(&sc->sc_txbuf, struct ath_buf, list); + list_del(&bf->list); + spin_unlock_bh(&sc->sc_txbuflock); + + list_add_tail(&bf->list, &bf_head); + + /* set up this buffer */ + ATH_TXBUF_RESET(bf); + bf->bf_frmlen = txctl->frmlen; + + ieee80211_is_data(fc) ? + (bf->bf_state.bf_type |= BUF_DATA) : + (bf->bf_state.bf_type &= ~BUF_DATA); + ieee80211_is_back_req(fc) ? + (bf->bf_state.bf_type |= BUF_BAR) : + (bf->bf_state.bf_type &= ~BUF_BAR); + ieee80211_is_pspoll(fc) ? + (bf->bf_state.bf_type |= BUF_PSPOLL) : + (bf->bf_state.bf_type &= ~BUF_PSPOLL); + (sc->sc_flags & SC_OP_PREAMBLE_SHORT) ? + (bf->bf_state.bf_type |= BUF_SHORT_PREAMBLE) : + (bf->bf_state.bf_type &= ~BUF_SHORT_PREAMBLE); + + bf->bf_flags = txctl->flags; + bf->bf_keytype = txctl->keytype; + tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0]; + rcs = tx_info_priv->rcs; + bf->bf_rcs[0] = rcs[0]; + bf->bf_rcs[1] = rcs[1]; + bf->bf_rcs[2] = rcs[2]; + bf->bf_rcs[3] = rcs[3]; + bf->bf_node = an; + bf->bf_mpdu = skb; + bf->bf_buf_addr = sg_dma_address(sg); + + /* setup descriptor */ + ds = bf->bf_desc; + ds->ds_link = 0; + ds->ds_data = bf->bf_buf_addr; + + /* + * Save the DMA context in the first ath_buf + */ + bf->bf_dmacontext = txctl->dmacontext; + + /* + * Formulate first tx descriptor with tx controls. + */ + ath9k_hw_set11n_txdesc(ah, + ds, + bf->bf_frmlen, /* frame length */ + txctl->atype, /* Atheros packet type */ + min(txctl->txpower, (u16)60), /* txpower */ + txctl->keyix, /* key cache index */ + txctl->keytype, /* key type */ + txctl->flags); /* flags */ + ath9k_hw_filltxdesc(ah, + ds, + sg_dma_len(sg), /* segment length */ + true, /* first segment */ + (n_sg == 1) ? true : false, /* last segment */ + ds); /* first descriptor */ + + bf->bf_lastfrm = bf; + (txctl->ht) ? + (bf->bf_state.bf_type |= BUF_HT) : + (bf->bf_state.bf_type &= ~BUF_HT); + + spin_lock_bh(&txq->axq_lock); + + if (txctl->ht && (sc->sc_flags & SC_OP_TXAGGR)) { + struct ath_atx_tid *tid = ATH_AN_2_TID(an, txctl->tidno); + if (ath_aggr_query(sc, an, txctl->tidno)) { + /* + * Try aggregation if it's a unicast data frame + * and the destination is HT capable. + */ + ath_tx_send_ampdu(sc, txq, tid, &bf_head, txctl); + } else { + /* + * Send this frame as regular when ADDBA exchange + * is neither complete nor pending. + */ + ath_tx_send_normal(sc, txq, tid, &bf_head); + } + } else { + bf->bf_lastbf = bf; + bf->bf_nframes = 1; + ath_buf_set_rate(sc, bf); + + if (ieee80211_is_back_req(fc)) { + /* This is required for resuming tid + * during BAR completion */ + bf->bf_tidno = txctl->tidno; + } + + ath_tx_txqaddbuf(sc, txq, &bf_head); + } + spin_unlock_bh(&txq->axq_lock); + return 0; +} + +static void xmit_map_sg(struct ath_softc *sc, + struct sk_buff *skb, + struct ath_tx_control *txctl) +{ + struct ath_xmit_status tx_status; + struct ath_atx_tid *tid; + struct scatterlist sg; + + txctl->dmacontext = pci_map_single(sc->pdev, skb->data, + skb->len, PCI_DMA_TODEVICE); + + /* setup S/G list */ + memset(&sg, 0, sizeof(struct scatterlist)); + sg_dma_address(&sg) = txctl->dmacontext; + sg_dma_len(&sg) = skb->len; + + if (ath_tx_start_dma(sc, skb, &sg, 1, txctl) != 0) { + /* + * We have to do drop frame here. + */ + pci_unmap_single(sc->pdev, txctl->dmacontext, + skb->len, PCI_DMA_TODEVICE); + + tx_status.retries = 0; + tx_status.flags = ATH_TX_ERROR; + + if (txctl->ht && (sc->sc_flags & SC_OP_TXAGGR)) { + /* Reclaim the seqno. */ + tid = ATH_AN_2_TID((struct ath_node *) + txctl->an, txctl->tidno); + DECR(tid->seq_next, IEEE80211_SEQ_MAX); + } + ath_tx_complete(sc, skb, &tx_status, txctl->an); + } +} + +/* Initialize TX queue and h/w */ + +int ath_tx_init(struct ath_softc *sc, int nbufs) +{ + int error = 0; + + do { + spin_lock_init(&sc->sc_txbuflock); + + /* Setup tx descriptors */ + error = ath_descdma_setup(sc, &sc->sc_txdma, &sc->sc_txbuf, + "tx", nbufs, 1); + if (error != 0) { + DPRINTF(sc, ATH_DBG_FATAL, + "%s: failed to allocate tx descriptors: %d\n", + __func__, error); + break; + } + + /* XXX allocate beacon state together with vap */ + error = ath_descdma_setup(sc, &sc->sc_bdma, &sc->sc_bbuf, + "beacon", ATH_BCBUF, 1); + if (error != 0) { + DPRINTF(sc, ATH_DBG_FATAL, + "%s: failed to allocate " + "beacon descripotrs: %d\n", + __func__, error); + break; + } + + } while (0); + + if (error != 0) + ath_tx_cleanup(sc); + + return error; +} + +/* Reclaim all tx queue resources */ + +int ath_tx_cleanup(struct ath_softc *sc) +{ + /* cleanup beacon descriptors */ + if (sc->sc_bdma.dd_desc_len != 0) + ath_descdma_cleanup(sc, &sc->sc_bdma, &sc->sc_bbuf); + + /* cleanup tx descriptors */ + if (sc->sc_txdma.dd_desc_len != 0) + ath_descdma_cleanup(sc, &sc->sc_txdma, &sc->sc_txbuf); + + return 0; +} + +/* Setup a h/w transmit queue */ + +struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype) +{ + struct ath_hal *ah = sc->sc_ah; + struct ath9k_tx_queue_info qi; + int qnum; + + memset(&qi, 0, sizeof(qi)); + qi.tqi_subtype = subtype; + qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT; + qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT; + qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT; + qi.tqi_physCompBuf = 0; + + /* + * Enable interrupts only for EOL and DESC conditions. + * We mark tx descriptors to receive a DESC interrupt + * when a tx queue gets deep; otherwise waiting for the + * EOL to reap descriptors. Note that this is done to + * reduce interrupt load and this only defers reaping + * descriptors, never transmitting frames. Aside from + * reducing interrupts this also permits more concurrency. + * The only potential downside is if the tx queue backs + * up in which case the top half of the kernel may backup + * due to a lack of tx descriptors. + * + * The UAPSD queue is an exception, since we take a desc- + * based intr on the EOSP frames. + */ + if (qtype == ATH9K_TX_QUEUE_UAPSD) + qi.tqi_qflags = TXQ_FLAG_TXDESCINT_ENABLE; + else + qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE | + TXQ_FLAG_TXDESCINT_ENABLE; + qnum = ath9k_hw_setuptxqueue(ah, qtype, &qi); + if (qnum == -1) { + /* + * NB: don't print a message, this happens + * normally on parts with too few tx queues + */ + return NULL; + } + if (qnum >= ARRAY_SIZE(sc->sc_txq)) { + DPRINTF(sc, ATH_DBG_FATAL, + "%s: hal qnum %u out of range, max %u!\n", + __func__, qnum, (unsigned int)ARRAY_SIZE(sc->sc_txq)); + ath9k_hw_releasetxqueue(ah, qnum); + return NULL; + } + if (!ATH_TXQ_SETUP(sc, qnum)) { + struct ath_txq *txq = &sc->sc_txq[qnum]; + + txq->axq_qnum = qnum; + txq->axq_link = NULL; + INIT_LIST_HEAD(&txq->axq_q); + INIT_LIST_HEAD(&txq->axq_acq); + spin_lock_init(&txq->axq_lock); + txq->axq_depth = 0; + txq->axq_aggr_depth = 0; + txq->axq_totalqueued = 0; + txq->axq_intrcnt = 0; + txq->axq_linkbuf = NULL; + sc->sc_txqsetup |= 1<<qnum; + } + return &sc->sc_txq[qnum]; +} + +/* Reclaim resources for a setup queue */ + +void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq) +{ + ath9k_hw_releasetxqueue(sc->sc_ah, txq->axq_qnum); + sc->sc_txqsetup &= ~(1<<txq->axq_qnum); +} + +/* + * Setup a hardware data transmit queue for the specified + * access control. The hal may not support all requested + * queues in which case it will return a reference to a + * previously setup queue. We record the mapping from ac's + * to h/w queues for use by ath_tx_start and also track + * the set of h/w queues being used to optimize work in the + * transmit interrupt handler and related routines. + */ + +int ath_tx_setup(struct ath_softc *sc, int haltype) +{ + struct ath_txq *txq; + + if (haltype >= ARRAY_SIZE(sc->sc_haltype2q)) { + DPRINTF(sc, ATH_DBG_FATAL, + "%s: HAL AC %u out of range, max %zu!\n", + __func__, haltype, ARRAY_SIZE(sc->sc_haltype2q)); + return 0; + } + txq = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, haltype); + if (txq != NULL) { + sc->sc_haltype2q[haltype] = txq->axq_qnum; + return 1; + } else + return 0; +} + +int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype) +{ + int qnum; + + switch (qtype) { + case ATH9K_TX_QUEUE_DATA: + if (haltype >= ARRAY_SIZE(sc->sc_haltype2q)) { + DPRINTF(sc, ATH_DBG_FATAL, + "%s: HAL AC %u out of range, max %zu!\n", + __func__, + haltype, ARRAY_SIZE(sc->sc_haltype2q)); + return -1; + } + qnum = sc->sc_haltype2q[haltype]; + break; + case ATH9K_TX_QUEUE_BEACON: + qnum = sc->sc_bhalq; + break; + case ATH9K_TX_QUEUE_CAB: + qnum = sc->sc_cabq->axq_qnum; + break; + default: + qnum = -1; + } + return qnum; +} + +/* Update parameters for a transmit queue */ + +int ath_txq_update(struct ath_softc *sc, int qnum, + struct ath9k_tx_queue_info *qinfo) +{ + struct ath_hal *ah = sc->sc_ah; + int error = 0; + struct ath9k_tx_queue_info qi; + + if (qnum == sc->sc_bhalq) { + /* + * XXX: for beacon queue, we just save the parameter. + * It will be picked up by ath_beaconq_config when + * it's necessary. + */ + sc->sc_beacon_qi = *qinfo; + return 0; + } + + ASSERT(sc->sc_txq[qnum].axq_qnum == qnum); + + ath9k_hw_get_txq_props(ah, qnum, &qi); + qi.tqi_aifs = qinfo->tqi_aifs; + qi.tqi_cwmin = qinfo->tqi_cwmin; + qi.tqi_cwmax = qinfo->tqi_cwmax; + qi.tqi_burstTime = qinfo->tqi_burstTime; + qi.tqi_readyTime = qinfo->tqi_readyTime; + + if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) { + DPRINTF(sc, ATH_DBG_FATAL, + "%s: unable to update hardware queue %u!\n", + __func__, qnum); + error = -EIO; + } else { + ath9k_hw_resettxqueue(ah, qnum); /* push to h/w */ + } + + return error; +} + +int ath_cabq_update(struct ath_softc *sc) +{ + struct ath9k_tx_queue_info qi; + int qnum = sc->sc_cabq->axq_qnum; + struct ath_beacon_config conf; + + ath9k_hw_get_txq_props(sc->sc_ah, qnum, &qi); + /* + * Ensure the readytime % is within the bounds. + */ + if (sc->sc_config.cabqReadytime < ATH9K_READY_TIME_LO_BOUND) + sc->sc_config.cabqReadytime = ATH9K_READY_TIME_LO_BOUND; + else if (sc->sc_config.cabqReadytime > ATH9K_READY_TIME_HI_BOUND) + sc->sc_config.cabqReadytime = ATH9K_READY_TIME_HI_BOUND; + + ath_get_beaconconfig(sc, ATH_IF_ID_ANY, &conf); + qi.tqi_readyTime = + (conf.beacon_interval * sc->sc_config.cabqReadytime) / 100; + ath_txq_update(sc, qnum, &qi); + + return 0; +} + +int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb) +{ + struct ath_tx_control txctl; + int error = 0; + + memset(&txctl, 0, sizeof(struct ath_tx_control)); + error = ath_tx_prepare(sc, skb, &txctl); + if (error == 0) + /* + * Start DMA mapping. + * ath_tx_start_dma() will be called either synchronously + * or asynchrounsly once DMA is complete. + */ + xmit_map_sg(sc, skb, &txctl); + else + ath_node_put(sc, txctl.an, ATH9K_BH_STATUS_CHANGE); + + /* failed packets will be dropped by the caller */ + return error; +} + +/* Deferred processing of transmit interrupt */ + +void ath_tx_tasklet(struct ath_softc *sc) +{ + int i; + u32 qcumask = ((1 << ATH9K_NUM_TX_QUEUES) - 1); + + ath9k_hw_gettxintrtxqs(sc->sc_ah, &qcumask); + + /* + * Process each active queue. + */ + for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) { + if (ATH_TXQ_SETUP(sc, i) && (qcumask & (1 << i))) + ath_tx_processq(sc, &sc->sc_txq[i]); + } +} + +void ath_tx_draintxq(struct ath_softc *sc, + struct ath_txq *txq, bool retry_tx) +{ + struct ath_buf *bf, *lastbf; + struct list_head bf_head; + + INIT_LIST_HEAD(&bf_head); + + /* + * NB: this assumes output has been stopped and + * we do not need to block ath_tx_tasklet + */ + for (;;) { + spin_lock_bh(&txq->axq_lock); + + if (list_empty(&txq->axq_q)) { + txq->axq_link = NULL; + txq->axq_linkbuf = NULL; + spin_unlock_bh(&txq->axq_lock); + break; + } + + bf = list_first_entry(&txq->axq_q, struct ath_buf, list); + + if (bf->bf_status & ATH_BUFSTATUS_STALE) { + list_del(&bf->list); + spin_unlock_bh(&txq->axq_lock); + + spin_lock_bh(&sc->sc_txbuflock); + list_add_tail(&bf->list, &sc->sc_txbuf); + spin_unlock_bh(&sc->sc_txbuflock); + continue; + } + + lastbf = bf->bf_lastbf; + if (!retry_tx) + lastbf->bf_desc->ds_txstat.ts_flags = + ATH9K_TX_SW_ABORTED; + + /* remove ath_buf's of the same mpdu from txq */ + list_cut_position(&bf_head, &txq->axq_q, &lastbf->list); + txq->axq_depth--; + + spin_unlock_bh(&txq->axq_lock); + + if (bf_isampdu(bf)) + ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, 0); + else + ath_tx_complete_buf(sc, bf, &bf_head, 0, 0); + } + + /* flush any pending frames if aggregation is enabled */ + if (sc->sc_flags & SC_OP_TXAGGR) { + if (!retry_tx) { + spin_lock_bh(&txq->axq_lock); + ath_txq_drain_pending_buffers(sc, txq, + ATH9K_BH_STATUS_CHANGE); + spin_unlock_bh(&txq->axq_lock); + } + } +} + +/* Drain the transmit queues and reclaim resources */ + +void ath_draintxq(struct ath_softc *sc, bool retry_tx) +{ + /* stop beacon queue. The beacon will be freed when + * we go to INIT state */ + if (!(sc->sc_flags & SC_OP_INVALID)) { + (void) ath9k_hw_stoptxdma(sc->sc_ah, sc->sc_bhalq); + DPRINTF(sc, ATH_DBG_XMIT, "%s: beacon queue %x\n", __func__, + ath9k_hw_gettxbuf(sc->sc_ah, sc->sc_bhalq)); + } + + ath_drain_txdataq(sc, retry_tx); +} + +u32 ath_txq_depth(struct ath_softc *sc, int qnum) +{ + return sc->sc_txq[qnum].axq_depth; +} + +u32 ath_txq_aggr_depth(struct ath_softc *sc, int qnum) +{ + return sc->sc_txq[qnum].axq_aggr_depth; +} + +/* Check if an ADDBA is required. A valid node must be passed. */ +enum ATH_AGGR_CHECK ath_tx_aggr_check(struct ath_softc *sc, + struct ath_node *an, + u8 tidno) +{ + struct ath_atx_tid *txtid; + DECLARE_MAC_BUF(mac); + + if (!(sc->sc_flags & SC_OP_TXAGGR)) + return AGGR_NOT_REQUIRED; + + /* ADDBA exchange must be completed before sending aggregates */ + txtid = ATH_AN_2_TID(an, tidno); + + if (txtid->addba_exchangecomplete) + return AGGR_EXCHANGE_DONE; + + if (txtid->cleanup_inprogress) + return AGGR_CLEANUP_PROGRESS; + + if (txtid->addba_exchangeinprogress) + return AGGR_EXCHANGE_PROGRESS; + + if (!txtid->addba_exchangecomplete) { + if (!txtid->addba_exchangeinprogress && + (txtid->addba_exchangeattempts < ADDBA_EXCHANGE_ATTEMPTS)) { + txtid->addba_exchangeattempts++; + return AGGR_REQUIRED; + } + } + + return AGGR_NOT_REQUIRED; +} + +/* Start TX aggregation */ + +int ath_tx_aggr_start(struct ath_softc *sc, + const u8 *addr, + u16 tid, + u16 *ssn) +{ + struct ath_atx_tid *txtid; + struct ath_node *an; + + spin_lock_bh(&sc->node_lock); + an = ath_node_find(sc, (u8 *) addr); + spin_unlock_bh(&sc->node_lock); + + if (!an) { + DPRINTF(sc, ATH_DBG_AGGR, + "%s: Node not found to initialize " + "TX aggregation\n", __func__); + return -1; + } + + if (sc->sc_flags & SC_OP_TXAGGR) { + txtid = ATH_AN_2_TID(an, tid); + txtid->addba_exchangeinprogress = 1; + ath_tx_pause_tid(sc, txtid); + } + + return 0; +} + +/* Stop tx aggregation */ + +int ath_tx_aggr_stop(struct ath_softc *sc, + const u8 *addr, + u16 tid) +{ + struct ath_node *an; + + spin_lock_bh(&sc->node_lock); + an = ath_node_find(sc, (u8 *) addr); + spin_unlock_bh(&sc->node_lock); + + if (!an) { + DPRINTF(sc, ATH_DBG_AGGR, + "%s: TX aggr stop for non-existent node\n", __func__); + return -1; + } + + ath_tx_aggr_teardown(sc, an, tid); + return 0; +} + +/* + * Performs transmit side cleanup when TID changes from aggregated to + * unaggregated. + * - Pause the TID and mark cleanup in progress + * - Discard all retry frames from the s/w queue. + */ + +void ath_tx_aggr_teardown(struct ath_softc *sc, + struct ath_node *an, u8 tid) +{ + struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid); + struct ath_txq *txq = &sc->sc_txq[txtid->ac->qnum]; + struct ath_buf *bf; + struct list_head bf_head; + INIT_LIST_HEAD(&bf_head); + + DPRINTF(sc, ATH_DBG_AGGR, "%s: teardown TX aggregation\n", __func__); + + if (txtid->cleanup_inprogress) /* cleanup is in progress */ + return; + + if (!txtid->addba_exchangecomplete) { + txtid->addba_exchangeattempts = 0; + return; + } + + /* TID must be paused first */ + ath_tx_pause_tid(sc, txtid); + + /* drop all software retried frames and mark this TID */ + spin_lock_bh(&txq->axq_lock); + while (!list_empty(&txtid->buf_q)) { + bf = list_first_entry(&txtid->buf_q, struct ath_buf, list); + if (!bf_isretried(bf)) { + /* + * NB: it's based on the assumption that + * software retried frame will always stay + * at the head of software queue. + */ + break; + } + list_cut_position(&bf_head, + &txtid->buf_q, &bf->bf_lastfrm->list); + ath_tx_update_baw(sc, txtid, bf->bf_seqno); + + /* complete this sub-frame */ + ath_tx_complete_buf(sc, bf, &bf_head, 0, 0); + } + + if (txtid->baw_head != txtid->baw_tail) { + spin_unlock_bh(&txq->axq_lock); + txtid->cleanup_inprogress = true; + } else { + txtid->addba_exchangecomplete = 0; + txtid->addba_exchangeattempts = 0; + spin_unlock_bh(&txq->axq_lock); + ath_tx_flush_tid(sc, txtid); + } +} + +/* + * Tx scheduling logic + * NB: must be called with txq lock held + */ + +void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq) +{ + struct ath_atx_ac *ac; + struct ath_atx_tid *tid; + + /* nothing to schedule */ + if (list_empty(&txq->axq_acq)) + return; + /* + * get the first node/ac pair on the queue + */ + ac = list_first_entry(&txq->axq_acq, struct ath_atx_ac, list); + list_del(&ac->list); + ac->sched = false; + + /* + * process a single tid per destination + */ + do { + /* nothing to schedule */ + if (list_empty(&ac->tid_q)) + return; + + tid = list_first_entry(&ac->tid_q, struct ath_atx_tid, list); + list_del(&tid->list); + tid->sched = false; + + if (tid->paused) /* check next tid to keep h/w busy */ + continue; + + if (!(tid->an->an_smmode == ATH_SM_PWRSAV_DYNAMIC) || + ((txq->axq_depth % 2) == 0)) { + ath_tx_sched_aggr(sc, txq, tid); + } + + /* + * add tid to round-robin queue if more frames + * are pending for the tid + */ + if (!list_empty(&tid->buf_q)) + ath_tx_queue_tid(txq, tid); + + /* only schedule one TID at a time */ + break; + } while (!list_empty(&ac->tid_q)); + + /* + * schedule AC if more TIDs need processing + */ + if (!list_empty(&ac->tid_q)) { + /* + * add dest ac to txq if not already added + */ + if (!ac->sched) { + ac->sched = true; + list_add_tail(&ac->list, &txq->axq_acq); + } + } +} + +/* Initialize per-node transmit state */ + +void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an) +{ + if (sc->sc_flags & SC_OP_TXAGGR) { + struct ath_atx_tid *tid; + struct ath_atx_ac *ac; + int tidno, acno; + + sc->sc_ht_info.maxampdu = ATH_AMPDU_LIMIT_DEFAULT; + + /* + * Init per tid tx state + */ + for (tidno = 0, tid = &an->an_aggr.tx.tid[tidno]; + tidno < WME_NUM_TID; + tidno++, tid++) { + tid->an = an; + tid->tidno = tidno; + tid->seq_start = tid->seq_next = 0; + tid->baw_size = WME_MAX_BA; + tid->baw_head = tid->baw_tail = 0; + tid->sched = false; + tid->paused = false; + tid->cleanup_inprogress = false; + INIT_LIST_HEAD(&tid->buf_q); + + acno = TID_TO_WME_AC(tidno); + tid->ac = &an->an_aggr.tx.ac[acno]; + + /* ADDBA state */ + tid->addba_exchangecomplete = 0; + tid->addba_exchangeinprogress = 0; + tid->addba_exchangeattempts = 0; + } + + /* + * Init per ac tx state + */ + for (acno = 0, ac = &an->an_aggr.tx.ac[acno]; + acno < WME_NUM_AC; acno++, ac++) { + ac->sched = false; + INIT_LIST_HEAD(&ac->tid_q); + + switch (acno) { + case WME_AC_BE: + ac->qnum = ath_tx_get_qnum(sc, + ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_BE); + break; + case WME_AC_BK: + ac->qnum = ath_tx_get_qnum(sc, + ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_BK); + break; + case WME_AC_VI: + ac->qnum = ath_tx_get_qnum(sc, + ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_VI); + break; + case WME_AC_VO: + ac->qnum = ath_tx_get_qnum(sc, + ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_VO); + break; + } + } + } +} + +/* Cleanupthe pending buffers for the node. */ + +void ath_tx_node_cleanup(struct ath_softc *sc, + struct ath_node *an, bool bh_flag) +{ + int i; + struct ath_atx_ac *ac, *ac_tmp; + struct ath_atx_tid *tid, *tid_tmp; + struct ath_txq *txq; + for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) { + if (ATH_TXQ_SETUP(sc, i)) { + txq = &sc->sc_txq[i]; + + if (likely(bh_flag)) + spin_lock_bh(&txq->axq_lock); + else + spin_lock(&txq->axq_lock); + + list_for_each_entry_safe(ac, + ac_tmp, &txq->axq_acq, list) { + tid = list_first_entry(&ac->tid_q, + struct ath_atx_tid, list); + if (tid && tid->an != an) + continue; + list_del(&ac->list); + ac->sched = false; + + list_for_each_entry_safe(tid, + tid_tmp, &ac->tid_q, list) { + list_del(&tid->list); + tid->sched = false; + ath_tid_drain(sc, txq, tid, bh_flag); + tid->addba_exchangecomplete = 0; + tid->addba_exchangeattempts = 0; + tid->cleanup_inprogress = false; + } + } + + if (likely(bh_flag)) + spin_unlock_bh(&txq->axq_lock); + else + spin_unlock(&txq->axq_lock); + } + } +} + +/* Cleanup per node transmit state */ + +void ath_tx_node_free(struct ath_softc *sc, struct ath_node *an) +{ + if (sc->sc_flags & SC_OP_TXAGGR) { + struct ath_atx_tid *tid; + int tidno, i; + + /* Init per tid rx state */ + for (tidno = 0, tid = &an->an_aggr.tx.tid[tidno]; + tidno < WME_NUM_TID; + tidno++, tid++) { + + for (i = 0; i < ATH_TID_MAX_BUFS; i++) + ASSERT(tid->tx_buf[i] == NULL); + } + } +} + +void ath_tx_cabq(struct ath_softc *sc, struct sk_buff *skb) +{ + int hdrlen, padsize; + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct ath_tx_control txctl; + + /* + * As a temporary workaround, assign seq# here; this will likely need + * to be cleaned up to work better with Beacon transmission and virtual + * BSSes. + */ + if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; + if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) + sc->seq_no += 0x10; + hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); + hdr->seq_ctrl |= cpu_to_le16(sc->seq_no); + } + + /* Add the padding after the header if this is not already done */ + hdrlen = ieee80211_get_hdrlen_from_skb(skb); + if (hdrlen & 3) { + padsize = hdrlen % 4; + if (skb_headroom(skb) < padsize) { + DPRINTF(sc, ATH_DBG_XMIT, "%s: TX CABQ padding " + "failed\n", __func__); + dev_kfree_skb_any(skb); + return; + } + skb_push(skb, padsize); + memmove(skb->data, skb->data + padsize, hdrlen); + } + + DPRINTF(sc, ATH_DBG_XMIT, "%s: transmitting CABQ packet, skb: %p\n", + __func__, + skb); + + memset(&txctl, 0, sizeof(struct ath_tx_control)); + txctl.flags = ATH9K_TXDESC_CAB; + if (ath_tx_prepare(sc, skb, &txctl) == 0) { + /* + * Start DMA mapping. + * ath_tx_start_dma() will be called either synchronously + * or asynchrounsly once DMA is complete. + */ + xmit_map_sg(sc, skb, &txctl); + } else { + ath_node_put(sc, txctl.an, ATH9K_BH_STATUS_CHANGE); + DPRINTF(sc, ATH_DBG_XMIT, "%s: TX CABQ failed\n", __func__); + dev_kfree_skb_any(skb); + } +} + |