diff options
Diffstat (limited to 'drivers/net/wireless/ath9k/xmit.c')
| -rw-r--r-- | drivers/net/wireless/ath9k/xmit.c | 2878 |
1 files changed, 1265 insertions, 1613 deletions
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c index c92f0c6e4adc..007ca91188d1 100644 --- a/drivers/net/wireless/ath9k/xmit.c +++ b/drivers/net/wireless/ath9k/xmit.c @@ -55,94 +55,19 @@ static u32 bits_per_symbol[][2] = { #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_send_normal(struct ath_softc *sc, struct ath_txq *txq, + struct ath_atx_tid *tid, + struct list_head *bf_head); +static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf, + struct list_head *bf_q, + int txok, int sendbar); 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; + struct list_head *head); +static void ath_buf_set_rate(struct ath_softc *sc, 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, - "qnum: %d, txq depth: %d\n", txq->axq_qnum, txq->axq_depth); - - if (txq->axq_link == NULL) { - ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr); - DPRINTF(sc, ATH_DBG_XMIT, - "TXDP[%u] = %llx (%p)\n", - txq->axq_qnum, ito64(bf->bf_daddr), bf->bf_desc); - } else { - *txq->axq_link = bf->bf_daddr; - DPRINTF(sc, ATH_DBG_XMIT, "link[%u] (%p)=%llx (%p)\n", - 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); -} - -static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb, - struct ath_xmit_status *tx_status) -{ - struct ieee80211_hw *hw = sc->hw; - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info); - int hdrlen, padsize; - - DPRINTF(sc, ATH_DBG_XMIT, "TX complete: skb: %p\n", skb); - - if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK || - tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED) { - kfree(tx_info_priv); - tx_info->rate_driver_data[0] = NULL; - } - - if (tx_status->flags & ATH_TX_BAR) { - tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK; - tx_status->flags &= ~ATH_TX_BAR; - } - - if (!(tx_status->flags & (ATH_TX_ERROR | ATH_TX_XRETRY))) { - /* Frame was ACKed */ - tx_info->flags |= IEEE80211_TX_STAT_ACK; - } - - tx_info->status.rates[0].count = tx_status->retries + 1; - - hdrlen = ieee80211_get_hdrlen_from_skb(skb); - padsize = hdrlen & 3; - if (padsize && hdrlen >= 24) { - /* - * Remove MAC header padding before giving the frame back to - * mac80211. - */ - memmove(skb->data + padsize, skb->data, hdrlen); - skb_pull(skb, padsize); - } - - ieee80211_tx_status(hw, skb); -} - -/* Check if it's okay to send out aggregates */ +/*********************/ +/* Aggregation logic */ +/*********************/ static int ath_aggr_query(struct ath_softc *sc, struct ath_node *an, u8 tidno) { @@ -156,232 +81,19 @@ static int ath_aggr_query(struct ath_softc *sc, struct ath_node *an, u8 tidno) return 0; } -static void ath_get_beaconconfig(struct ath_softc *sc, int if_id, - struct ath_beacon_config *conf) -{ - struct ieee80211_hw *hw = sc->hw; - - /* fill in beacon config data */ - - conf->beacon_interval = hw->conf.beacon_int; - conf->listen_interval = 100; - conf->dtim_count = 1; - conf->bmiss_timeout = ATH_DEFAULT_BMISS_LIMIT * conf->listen_interval; -} - -/* Calculate Atheros packet type from IEEE80211 packet header */ - -static enum ath9k_pkt_type get_hw_packet_type(struct sk_buff *skb) -{ - struct ieee80211_hdr *hdr; - enum ath9k_pkt_type htype; - __le16 fc; - - hdr = (struct ieee80211_hdr *)skb->data; - fc = hdr->frame_control; - - 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 bool is_pae(struct sk_buff *skb) -{ - struct ieee80211_hdr *hdr; - __le16 fc; - - hdr = (struct ieee80211_hdr *)skb->data; - fc = hdr->frame_control; - - if (ieee80211_is_data(fc)) { - if (ieee80211_is_nullfunc(fc) || - /* Port Access Entity (IEEE 802.1X) */ - (skb->protocol == cpu_to_be16(ETH_P_PAE))) { - return true; - } - } - - return false; -} - -static int get_hw_crypto_keytype(struct sk_buff *skb) -{ - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - - if (tx_info->control.hw_key) { - if (tx_info->control.hw_key->alg == ALG_WEP) - return ATH9K_KEY_TYPE_WEP; - else if (tx_info->control.hw_key->alg == ALG_TKIP) - return ATH9K_KEY_TYPE_TKIP; - else if (tx_info->control.hw_key->alg == ALG_CCMP) - return ATH9K_KEY_TYPE_AES; - } - - return ATH9K_KEY_TYPE_CLEAR; -} - -/* Called only when tx aggregation is enabled and HT is supported */ - -static void assign_aggr_tid_seqno(struct sk_buff *skb, - struct ath_buf *bf) -{ - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - struct ieee80211_hdr *hdr; - struct ath_node *an; - struct ath_atx_tid *tid; - __le16 fc; - u8 *qc; - - if (!tx_info->control.sta) - return; - - an = (struct ath_node *)tx_info->control.sta->drv_priv; - hdr = (struct ieee80211_hdr *)skb->data; - fc = hdr->frame_control; - - /* Get tidno */ - - if (ieee80211_is_data_qos(fc)) { - qc = ieee80211_get_qos_ctl(hdr); - bf->bf_tidno = qc[0] & 0xf; - } - - /* Get seqno */ - /* 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. - * - * If fragmentation is on, the sequence number is - * not overridden, since it has been - * incremented by the fragmentation routine. - * - * FIXME: check if the fragmentation threshold exceeds - * IEEE80211 max. - */ - tid = ATH_AN_2_TID(an, bf->bf_tidno); - hdr->seq_ctrl = cpu_to_le16(tid->seq_next << - IEEE80211_SEQ_SEQ_SHIFT); - bf->bf_seqno = tid->seq_next; - INCR(tid->seq_next, IEEE80211_SEQ_MAX); -} - -static int setup_tx_flags(struct ath_softc *sc, struct sk_buff *skb, - struct ath_txq *txq) -{ - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - int flags = 0; - - flags |= ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */ - flags |= ATH9K_TXDESC_INTREQ; - - if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK) - flags |= ATH9K_TXDESC_NOACK; - if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) - flags |= ATH9K_TXDESC_RTSENA; - - return flags; -} - -static struct ath_buf *ath_tx_get_buffer(struct ath_softc *sc) -{ - struct ath_buf *bf = NULL; - - spin_lock_bh(&sc->tx.txbuflock); - - if (unlikely(list_empty(&sc->tx.txbuf))) { - spin_unlock_bh(&sc->tx.txbuflock); - return NULL; - } - - bf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list); - list_del(&bf->list); - - spin_unlock_bh(&sc->tx.txbuflock); - - return bf; -} - -/* 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; - unsigned long flags; - - /* - * 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); - - /* - * Return the list of ath_buf of this mpdu to free queue - */ - spin_lock_irqsave(&sc->tx.txbuflock, flags); - list_splice_tail_init(bf_q, &sc->tx.txbuf); - spin_unlock_irqrestore(&sc->tx.txbuflock, flags); -} - -/* - * 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; @@ -389,22 +101,16 @@ static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid) 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->tx.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) +static void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid) { struct ath_txq *txq = &sc->tx.txq[tid->ac->qnum]; @@ -419,63 +125,39 @@ void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid) 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) +static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid) { - 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 (ds->ds_txstat.ts_flags == ATH9K_TX_SW_ABORTED) - return 0; + struct ath_txq *txq = &sc->tx.txq[tid->ac->qnum]; + struct ath_buf *bf; + struct list_head bf_head; + INIT_LIST_HEAD(&bf_head); - 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); - } + ASSERT(tid->paused > 0); + spin_lock_bh(&txq->axq_lock); - while (bf) { - ba_index = ATH_BA_INDEX(seq_st, bf->bf_seqno); - if (!txok || (isaggr && !ATH_BA_ISSET(ba, ba_index))) - nbad++; + tid->paused--; - bf = bf->bf_next; + if (tid->paused > 0) { + spin_unlock_bh(&txq->axq_lock); + return; } - 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++; + while (!list_empty(&tid->buf_q)) { + bf = list_first_entry(&tid->buf_q, struct ath_buf, list); + ASSERT(!bf_isretried(bf)); + list_move_tail(&bf->list, &bf_head); + ath_tx_send_normal(sc, txq, tid, &bf_head); + } - skb = bf->bf_mpdu; - hdr = (struct ieee80211_hdr *)skb->data; - hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY); + spin_unlock_bh(&txq->axq_lock); } -/* Update block ack window */ - static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid, int seqno) { @@ -492,290 +174,142 @@ static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid, } } -/* - * 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) +static void ath_tx_addto_baw(struct ath_softc *sc, struct ath_atx_tid *tid, + struct ath_buf *bf) { - struct ath_rate_table *rate_table = sc->cur_rate_table; - u32 nbits, nsymbits, duration, nsymbols; - u8 rc; - int streams, pktlen; - - pktlen = bf_isaggr(bf) ? bf->bf_al : bf->bf_frmlen; - rc = rate_table->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, rate_table, pktlen, - rix, shortPreamble); + int index, cindex; - /* 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 (bf_isretried(bf)) + return; - if (!half_gi) - duration = SYMBOL_TIME(nsymbols); - else - duration = SYMBOL_TIME_HALFGI(nsymbols); + index = ATH_BA_INDEX(tid->seq_start, bf->bf_seqno); + cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1); - /* 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); + ASSERT(tid->tx_buf[cindex] == NULL); + tid->tx_buf[cindex] = bf; - return duration; + 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); + } } -/* Rate module function to set rate related fields in tx descriptor */ +/* + * 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. + */ +static void ath_tid_drain(struct ath_softc *sc, struct ath_txq *txq, + struct ath_atx_tid *tid) -static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf) { - struct ath_hal *ah = sc->sc_ah; - struct ath_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]; - struct sk_buff *skb; - struct ieee80211_tx_info *tx_info; - struct ieee80211_tx_rate *rates; - struct ieee80211_hdr *hdr; - int i, flags, rtsctsena = 0; - u32 ctsduration = 0; - u8 rix = 0, cix, ctsrate = 0; - __le16 fc; - - memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4); - - skb = (struct sk_buff *)bf->bf_mpdu; - hdr = (struct ieee80211_hdr *)skb->data; - fc = hdr->frame_control; - tx_info = IEEE80211_SKB_CB(skb); - rates = tx_info->control.rates; - - if (ieee80211_has_morefrags(fc) || - (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) { - rates[1].count = rates[2].count = rates[3].count = 0; - rates[1].idx = rates[2].idx = rates[3].idx = 0; - rates[0].count = ATH_TXMAXTRY; - } + struct ath_buf *bf; + struct list_head bf_head; + INIT_LIST_HEAD(&bf_head); - /* get the cix for the lowest valid rix */ - rt = sc->cur_rate_table; - for (i = 3; i >= 0; i--) { - if (rates[i].count && (rates[i].idx >= 0)) { - rix = rates[i].idx; + for (;;) { + if (list_empty(&tid->buf_q)) break; - } - } - flags = (bf->bf_flags & (ATH9K_TXDESC_RTSENA | ATH9K_TXDESC_CTSENA)); - cix = rt->info[rix].ctrl_rate; - - /* - * 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 && !(bf->bf_flags & ATH9K_TXDESC_NOACK) - && (rt->info[rix].phy == WLAN_RC_PHY_OFDM || - WLAN_RC_PHY_HT(rt->info[rix].phy))) { - 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].ctrl_rate; - 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)) { - /* 802.11g protection not needed, use our default behavior */ - if (!rtsctsena) - flags = ATH9K_TXDESC_RTSENA; - } - - /* 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].ctrl_rate; - rtsctsena = 1; - } - - /* For AR5416 - RTS cannot be followed by a frame larger than 8K */ - if (bf_isaggr(bf) && (bf->bf_al > ah->ah_caps.rts_aggr_limit)) - 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 - */ - ctsrate = rt->info[cix].ratecode | - (bf_isshpreamble(bf) ? rt->info[cix].short_preamble : 0); - - for (i = 0; i < 4; i++) { - if (!rates[i].count || (rates[i].idx < 0)) - continue; - - rix = rates[i].idx; - - series[i].Rate = rt->info[rix].ratecode | - (bf_isshpreamble(bf) ? rt->info[rix].short_preamble : 0); - - series[i].Tries = rates[i].count; - - series[i].RateFlags = ( - (rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) ? - ATH9K_RATESERIES_RTS_CTS : 0) | - ((rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ? - ATH9K_RATESERIES_2040 : 0) | - ((rates[i].flags & IEEE80211_TX_RC_SHORT_GI) ? - ATH9K_RATESERIES_HALFGI : 0); - - series[i].PktDuration = ath_pkt_duration(sc, rix, bf, - (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) != 0, - (rates[i].flags & IEEE80211_TX_RC_SHORT_GI), - bf_isshpreamble(bf)); + bf = list_first_entry(&tid->buf_q, struct ath_buf, list); + list_move_tail(&bf->list, &bf_head); - series[i].ChSel = sc->sc_tx_chainmask; + if (bf_isretried(bf)) + ath_tx_update_baw(sc, tid, bf->bf_seqno); - if (rtsctsena) - series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS; + spin_unlock(&txq->axq_lock); + ath_tx_complete_buf(sc, bf, &bf_head, 0, 0); + spin_lock(&txq->axq_lock); } - /* 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); + tid->seq_next = tid->seq_start; + tid->baw_tail = tid->baw_head; } -/* - * 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) +static void ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf) { - struct ath_buf *bf; - - 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 */ - - /* update starting sequence number for subsequent ADDBA request */ - INCR(tid->seq_start, IEEE80211_SEQ_MAX); + struct sk_buff *skb; + struct ieee80211_hdr *hdr; - /* 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); + bf->bf_state.bf_type |= BUF_RETRY; + bf->bf_retries++; - return 0; + skb = bf->bf_mpdu; + hdr = (struct ieee80211_hdr *)skb->data; + hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY); } -/* 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) +static struct ath_buf* ath_clone_txbuf(struct ath_softc *sc, struct ath_buf *bf) { - struct ath_txq *txq = &sc->tx.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); + struct ath_buf *tbf; - tid->paused--; + spin_lock_bh(&sc->tx.txbuflock); + ASSERT(!list_empty((&sc->tx.txbuf))); + tbf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list); + list_del(&tbf->list); + spin_unlock_bh(&sc->tx.txbuflock); - if (tid->paused > 0) { - spin_unlock_bh(&txq->axq_lock); - return; - } + ATH_TXBUF_RESET(tbf); - 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); - } + tbf->bf_mpdu = bf->bf_mpdu; + tbf->bf_buf_addr = bf->bf_buf_addr; + *(tbf->bf_desc) = *(bf->bf_desc); + tbf->bf_state = bf->bf_state; + tbf->bf_dmacontext = bf->bf_dmacontext; - spin_unlock_bh(&txq->axq_lock); + return tbf; } -/* 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) +static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq, + struct ath_buf *bf, struct list_head *bf_q, + int txok) { struct ath_node *an = NULL; struct sk_buff *skb; - struct ieee80211_tx_info *tx_info; + struct ieee80211_sta *sta; + struct ieee80211_hdr *hdr; struct ath_atx_tid *tid = NULL; - struct ath_buf *bf_last = bf->bf_lastbf; + struct ath_buf *bf_next, *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; skb = (struct sk_buff *)bf->bf_mpdu; - tx_info = IEEE80211_SKB_CB(skb); + hdr = (struct ieee80211_hdr *)skb->data; - if (tx_info->control.sta) { - an = (struct ath_node *)tx_info->control.sta->drv_priv; - tid = ATH_AN_2_TID(an, bf->bf_tidno); + rcu_read_lock(); + + sta = ieee80211_find_sta(sc->hw, hdr->addr1); + if (!sta) { + rcu_read_unlock(); + return; } + an = (struct ath_node *)sta->drv_priv; + tid = ATH_AN_2_TID(an, bf->bf_tidno); + 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); + 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 == - NL80211_IFTYPE_STATION) - needreset = 1; - } + if (isaggr && txok) { + if (ATH_DS_TX_BA(ds)) { + 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 == NL80211_IFTYPE_STATION) + needreset = 1; } } @@ -792,7 +326,6 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc, } else if (!isaggr && txok) { /* transmit completion */ } else { - if (!(tid->state & AGGR_CLEANUP) && ds->ds_txstat.ts_flags != ATH9K_TX_SW_ABORTED) { if (bf->bf_retries < ATH_MAX_SW_RETRIES) { @@ -811,37 +344,12 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc, 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); - } + if (bf_next == NULL) { + INIT_LIST_HEAD(&bf_head); } else { ASSERT(!list_empty(bf_q)); - list_cut_position(&bf_head, - bf_q, &bf->bf_lastfrm->list); + list_move_tail(&bf->list, &bf_head); } if (!txpending) { @@ -853,62 +361,22 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc, 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. - */ + /* retry the un-acked ones */ if (bf->bf_next == NULL && bf_last->bf_status & ATH_BUFSTATUS_STALE) { struct ath_buf *tbf; - /* allocate new descriptor */ - spin_lock_bh(&sc->tx.txbuflock); - ASSERT(!list_empty((&sc->tx.txbuf))); - tbf = list_first_entry(&sc->tx.txbuf, - struct ath_buf, list); - list_del(&tbf->list); - spin_unlock_bh(&sc->tx.txbuflock); - - ATH_TXBUF_RESET(tbf); - - /* copy descriptor content */ - tbf->bf_mpdu = bf_last->bf_mpdu; - 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; - } + tbf = ath_clone_txbuf(sc, bf_last); + ath9k_hw_cleartxdesc(sc->sc_ah, tbf->bf_desc); 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); + ath9k_hw_cleartxdesc(sc->sc_ah, bf->bf_desc); } /* @@ -922,332 +390,33 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc, } if (tid->state & AGGR_CLEANUP) { - /* 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->state &= ~AGGR_ADDBA_COMPLETE; tid->addba_exchangeattempts = 0; - spin_unlock_bh(&txq->axq_lock); - tid->state &= ~AGGR_CLEANUP; /* send buffered frames as singles */ ath_tx_flush_tid(sc, tid); - } else - spin_unlock_bh(&txq->axq_lock); - + } + rcu_read_unlock(); return; } - /* - * prepend un-acked frames to the beginning of the pending frame queue - */ + /* 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); } + rcu_read_unlock(); + if (needreset) ath_reset(sc, false); - - return; -} - -static void ath_tx_rc_status(struct ath_buf *bf, struct ath_desc *ds, int nbad) -{ - struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu; - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info); - - tx_info_priv->update_rc = false; - 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 (bf_isdata(bf)) { - memcpy(&tx_info_priv->tx, &ds->ds_txstat, - sizeof(tx_info_priv->tx)); - tx_info_priv->n_frames = bf->bf_nframes; - tx_info_priv->n_bad_frames = nbad; - tx_info_priv->update_rc = true; - } - } } -/* Process completed xmit descriptors from the specified queue */ - -static void 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; - int txok, nbad = 0; - int status; - - DPRINTF(sc, ATH_DBG_QUEUE, "tx queue %d (%x), link %p\n", - txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum), - txq->axq_link); - - 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); - - /* - * 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->tx.txbuflock); - list_add_tail(&bf_held->list, &sc->tx.txbuf); - spin_unlock_bh(&sc->tx.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); - } - - ath_tx_rc_status(bf, ds, 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); - } -} - -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, "tx queue [%u] %x, link %p\n", - 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, status, npend = 0; - - 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->tx.txq[i]); - /* The TxDMA may not really be stopped. - * Double check the hal tx pending count */ - npend += ath9k_hw_numtxpending(ah, - sc->tx.txq[i].axq_qnum); - } - } - } - - if (npend) { - /* TxDMA not stopped, reset the hal */ - DPRINTF(sc, ATH_DBG_XMIT, "Unable to stop TxDMA. Reset HAL!\n"); - - spin_lock_bh(&sc->sc_resetlock); - if (!ath9k_hw_reset(ah, - sc->sc_ah->ah_curchan, - sc->tx_chan_width, - sc->sc_tx_chainmask, sc->sc_rx_chainmask, - sc->sc_ht_extprotspacing, true, &status)) { - - DPRINTF(sc, ATH_DBG_FATAL, - "Unable to reset hardware; hal status %u\n", - 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->tx.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_atx_tid *tid, - struct list_head *bf_head, - struct ath_tx_control *txctl) -{ - struct ath_buf *bf; - - BUG_ON(list_empty(bf_head)); - - bf = list_first_entry(bf_head, struct ath_buf, list); - bf->bf_state.bf_type |= BUF_AMPDU; - - /* - * 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) || - txctl->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(txctl->txq, tid); - return 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, txctl->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, +static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf, struct ath_atx_tid *tid) { struct ath_rate_table *rate_table = sc->cur_rate_table; @@ -1255,15 +424,14 @@ static u32 ath_lookup_rate(struct ath_softc *sc, struct ieee80211_tx_info *tx_info; struct ieee80211_tx_rate *rates; struct ath_tx_info_priv *tx_info_priv; - u32 max_4ms_framelen, frame_length; + u32 max_4ms_framelen, frmlen; u16 aggr_limit, legacy = 0, maxampdu; int i; skb = (struct sk_buff *)bf->bf_mpdu; tx_info = IEEE80211_SKB_CB(skb); rates = tx_info->control.rates; - tx_info_priv = - (struct ath_tx_info_priv *)tx_info->rate_driver_data[0]; + tx_info_priv = (struct ath_tx_info_priv *)tx_info->rate_driver_data[0]; /* * Find the lowest frame length among the rate series that will have a @@ -1279,9 +447,8 @@ static u32 ath_lookup_rate(struct ath_softc *sc, break; } - frame_length = - rate_table->info[rates[i].idx].max_4ms_framelen; - max_4ms_framelen = min(max_4ms_framelen, frame_length); + frmlen = rate_table->info[rates[i].idx].max_4ms_framelen; + max_4ms_framelen = min(max_4ms_framelen, frmlen); } } @@ -1293,8 +460,7 @@ static u32 ath_lookup_rate(struct ath_softc *sc, if (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE || legacy) return 0; - aggr_limit = min(max_4ms_framelen, - (u32)ATH_AMPDU_LIMIT_DEFAULT); + aggr_limit = min(max_4ms_framelen, (u32)ATH_AMPDU_LIMIT_DEFAULT); /* * h/w can accept aggregates upto 16 bit lengths (65535). @@ -1309,14 +475,12 @@ static u32 ath_lookup_rate(struct ath_softc *sc, } /* - * returns the number of delimiters to be added to + * Returns the number of delimiters to be added to * meet the minimum required mpdudensity. - * caller should make sure that the rate is HT rate . + * caller should make sure that the rate is HT rate . */ -static int ath_compute_num_delims(struct ath_softc *sc, - struct ath_atx_tid *tid, - struct ath_buf *bf, - u16 frmlen) +static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid, + struct ath_buf *bf, u16 frmlen) { struct ath_rate_table *rt = sc->cur_rate_table; struct sk_buff *skb = bf->bf_mpdu; @@ -1370,9 +534,7 @@ static int ath_compute_num_delims(struct ath_softc *sc, 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); } @@ -1380,37 +542,23 @@ static int ath_compute_num_delims(struct ath_softc *sc, 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) + struct ath_atx_tid *tid, + struct list_head *bf_q) { #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; + struct ath_buf *bf, *bf_first, *bf_prev = NULL; + int rl = 0, nframes = 0, ndelim, prev_al = 0; 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; - 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 - */ + /* 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; @@ -1421,29 +569,23 @@ static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc, rl = 1; } - /* - * do not exceed aggregation limit - */ + /* do not exceed aggregation limit */ al_delta = ATH_AGGR_DELIM_SZ + bf->bf_frmlen; - if (nframes && (aggr_limit < - (al + bpad + al_delta + prev_al))) { + 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)) { + /* do not exceed subframe limit */ + if (nframes >= min((int)h_baw, ATH_AMPDU_SUBFRAME_DEFAULT)) { status = ATH_AGGR_LIMITED; break; } + nframes++; - /* - * add padding for previous frame to aggregation length - */ + /* add padding for previous frame to aggregation length */ al += bpad + al_delta; /* @@ -1451,69 +593,35 @@ static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc, * density for this node. */ ndelim = ath_compute_num_delims(sc, tid, bf_first, bf->bf_frmlen); - bpad = PADBYTES(al_delta) + (ndelim << 2); bf->bf_next = NULL; - bf->bf_lastfrm->bf_desc->ds_link = 0; + bf->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); + /* link buffers of this frame to the aggregate */ 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++; - + ath9k_hw_set11n_aggr_middle(sc->sc_ah, bf->bf_desc, ndelim); + list_move_tail(&bf->list, bf_q); if (bf_prev) { bf_prev->bf_next = bf; - bf_prev->bf_lastfrm->bf_desc->ds_link = bf->bf_daddr; + bf_prev->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) +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; + struct ath_buf *bf; 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)) @@ -1521,379 +629,183 @@ static void ath_tx_sched_aggr(struct ath_softc *sc, INIT_LIST_HEAD(&bf_q); - status = ath_tx_form_aggr(sc, tid, &bf_q, &bf_lastaggr, ¶m, - &prev_frames); + status = ath_tx_form_aggr(sc, tid, &bf_q); /* - * no frames picked up to be aggregated; block-ack - * window is not open + * 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; + bf->bf_lastbf = list_entry(bf_q.prev, struct ath_buf, list); - /* - * if only one frame, send as non-aggregate - */ + /* 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); - } - + ath9k_hw_clr11n_aggr(sc->sc_ah, bf->bf_desc); ath_buf_set_rate(sc, bf); ath_tx_txqaddbuf(sc, txq, &bf_q); continue; } - /* - * setup first desc with rate and aggr info - */ + /* setup first desc of aggregate */ 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); - } + /* anchor last desc of aggregate */ + ath9k_hw_set11n_aggr_last(sc->sc_ah, bf->bf_lastbf->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) - -{ - 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 - */ - spin_unlock(&txq->axq_lock); - - /* complete this sub-frame */ - ath_tx_complete_buf(sc, bf, &bf_head, 0, 0); - - 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) -{ - 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); - } - } -} - -static int ath_tx_setup_buffer(struct ath_softc *sc, struct ath_buf *bf, - struct sk_buff *skb, - struct ath_tx_control *txctl) +int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta, + u16 tid, u16 *ssn) { - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; - struct ath_tx_info_priv *tx_info_priv; - int hdrlen; - __le16 fc; - - tx_info_priv = kzalloc(sizeof(*tx_info_priv), GFP_ATOMIC); - if (unlikely(!tx_info_priv)) - return -ENOMEM; - tx_info->rate_driver_data[0] = tx_info_priv; - hdrlen = ieee80211_get_hdrlen_from_skb(skb); - fc = hdr->frame_control; - - ATH_TXBUF_RESET(bf); - - /* Frame type */ - - bf->bf_frmlen = skb->len + FCS_LEN - (hdrlen & 3); - - 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); - (sc->hw->conf.ht.enabled && !is_pae(skb) && - (tx_info->flags & IEEE80211_TX_CTL_AMPDU)) ? - (bf->bf_state.bf_type |= BUF_HT) : - (bf->bf_state.bf_type &= ~BUF_HT); - - bf->bf_flags = setup_tx_flags(sc, skb, txctl->txq); - - /* Crypto */ - - bf->bf_keytype = get_hw_crypto_keytype(skb); - - if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR) { - bf->bf_frmlen += tx_info->control.hw_key->icv_len; - bf->bf_keyix = tx_info->control.hw_key->hw_key_idx; - } else { - bf->bf_keyix = ATH9K_TXKEYIX_INVALID; - } - - /* Assign seqno, tidno */ - - if (ieee80211_is_data_qos(fc) && (sc->sc_flags & SC_OP_TXAGGR)) - assign_aggr_tid_seqno(skb, bf); + struct ath_atx_tid *txtid; + struct ath_node *an; - /* DMA setup */ - bf->bf_mpdu = skb; + an = (struct ath_node *)sta->drv_priv; - bf->bf_dmacontext = pci_map_single(sc->pdev, skb->data, - skb->len, PCI_DMA_TODEVICE); - if (unlikely(pci_dma_mapping_error(sc->pdev, bf->bf_dmacontext))) { - bf->bf_mpdu = NULL; - DPRINTF(sc, ATH_DBG_CONFIG, - "pci_dma_mapping_error() on TX\n"); - return -ENOMEM; + if (sc->sc_flags & SC_OP_TXAGGR) { + txtid = ATH_AN_2_TID(an, tid); + txtid->state |= AGGR_ADDBA_PROGRESS; + ath_tx_pause_tid(sc, txtid); } - bf->bf_buf_addr = bf->bf_dmacontext; return 0; } -/* FIXME: tx power */ -static void ath_tx_start_dma(struct ath_softc *sc, struct ath_buf *bf, - struct ath_tx_control *txctl) +int ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid) { - struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu; - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - struct ath_node *an = NULL; + struct ath_node *an = (struct ath_node *)sta->drv_priv; + struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid); + struct ath_txq *txq = &sc->tx.txq[txtid->ac->qnum]; + struct ath_buf *bf; struct list_head bf_head; - struct ath_desc *ds; - struct ath_atx_tid *tid; - struct ath_hal *ah = sc->sc_ah; - int frm_type; - - frm_type = get_hw_packet_type(skb); - INIT_LIST_HEAD(&bf_head); - list_add_tail(&bf->list, &bf_head); - - /* setup descriptor */ - - ds = bf->bf_desc; - ds->ds_link = 0; - ds->ds_data = bf->bf_buf_addr; - - /* Formulate first tx descriptor with tx controls */ - - ath9k_hw_set11n_txdesc(ah, ds, bf->bf_frmlen, frm_type, MAX_RATE_POWER, - bf->bf_keyix, bf->bf_keytype, bf->bf_flags); - - ath9k_hw_filltxdesc(ah, ds, - skb->len, /* segment length */ - true, /* first segment */ - true, /* last segment */ - ds); /* first descriptor */ - bf->bf_lastfrm = bf; + if (txtid->state & AGGR_CLEANUP) + return 0; - spin_lock_bh(&txctl->txq->axq_lock); + if (!(txtid->state & AGGR_ADDBA_COMPLETE)) { + txtid->addba_exchangeattempts = 0; + return 0; + } - if (bf_isht(bf) && (sc->sc_flags & SC_OP_TXAGGR) && - tx_info->control.sta) { - an = (struct ath_node *)tx_info->control.sta->drv_priv; - tid = ATH_AN_2_TID(an, bf->bf_tidno); + ath_tx_pause_tid(sc, txtid); - if (ath_aggr_query(sc, an, bf->bf_tidno)) { - /* - * Try aggregation if it's a unicast data frame - * and the destination is HT capable. - */ - ath_tx_send_ampdu(sc, tid, &bf_head, txctl); - } else { + /* 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)) { /* - * Send this frame as regular when ADDBA - * exchange is neither complete nor pending. + * NB: it's based on the assumption that + * software retried frame will always stay + * at the head of software queue. */ - ath_tx_send_normal(sc, txctl->txq, - tid, &bf_head); + break; } - } else { - bf->bf_lastbf = bf; - bf->bf_nframes = 1; + list_move_tail(&bf->list, &bf_head); + ath_tx_update_baw(sc, txtid, bf->bf_seqno); + ath_tx_complete_buf(sc, bf, &bf_head, 0, 0); + } + spin_unlock_bh(&txq->axq_lock); - ath_buf_set_rate(sc, bf); - ath_tx_txqaddbuf(sc, txctl->txq, &bf_head); + if (txtid->baw_head != txtid->baw_tail) { + txtid->state |= AGGR_CLEANUP; + } else { + txtid->state &= ~AGGR_ADDBA_COMPLETE; + txtid->addba_exchangeattempts = 0; + ath_tx_flush_tid(sc, txtid); } - spin_unlock_bh(&txctl->txq->axq_lock); + return 0; } -/* Upon failure caller should free skb */ -int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb, - struct ath_tx_control *txctl) +void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid) { - struct ath_buf *bf; - int r; + struct ath_atx_tid *txtid; + struct ath_node *an; - /* Check if a tx buffer is available */ + an = (struct ath_node *)sta->drv_priv; - bf = ath_tx_get_buffer(sc); - if (!bf) { - DPRINTF(sc, ATH_DBG_XMIT, "TX buffers are full\n"); - return -1; + if (sc->sc_flags & SC_OP_TXAGGR) { + txtid = ATH_AN_2_TID(an, tid); + txtid->baw_size = + IEEE80211_MIN_AMPDU_BUF << sta->ht_cap.ampdu_factor; + txtid->state |= AGGR_ADDBA_COMPLETE; + txtid->state &= ~AGGR_ADDBA_PROGRESS; + ath_tx_resume_tid(sc, txtid); } +} - r = ath_tx_setup_buffer(sc, bf, skb, txctl); - if (unlikely(r)) { - struct ath_txq *txq = txctl->txq; - - DPRINTF(sc, ATH_DBG_FATAL, "TX mem alloc failure\n"); +bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno) +{ + struct ath_atx_tid *txtid; - /* upon ath_tx_processq() this TX queue will be resumed, we - * guarantee this will happen by knowing beforehand that - * we will at least have to run TX completionon one buffer - * on the queue */ - spin_lock_bh(&txq->axq_lock); - if (ath_txq_depth(sc, txq->axq_qnum) > 1) { - ieee80211_stop_queue(sc->hw, - skb_get_queue_mapping(skb)); - txq->stopped = 1; - } - spin_unlock_bh(&txq->axq_lock); + if (!(sc->sc_flags & SC_OP_TXAGGR)) + return false; - spin_lock_bh(&sc->tx.txbuflock); - list_add_tail(&bf->list, &sc->tx.txbuf); - spin_unlock_bh(&sc->tx.txbuflock); + txtid = ATH_AN_2_TID(an, tidno); - return r; + if (!(txtid->state & AGGR_ADDBA_COMPLETE)) { + if (!(txtid->state & AGGR_ADDBA_PROGRESS) && + (txtid->addba_exchangeattempts < ADDBA_EXCHANGE_ATTEMPTS)) { + txtid->addba_exchangeattempts++; + return true; + } } - ath_tx_start_dma(sc, bf, txctl); - - return 0; + return false; } -/* Initialize TX queue and h/w */ +/********************/ +/* Queue Management */ +/********************/ -int ath_tx_init(struct ath_softc *sc, int nbufs) +static u32 ath_txq_depth(struct ath_softc *sc, int qnum) { - int error = 0; - - do { - spin_lock_init(&sc->tx.txbuflock); - - /* Setup tx descriptors */ - error = ath_descdma_setup(sc, &sc->tx.txdma, &sc->tx.txbuf, - "tx", nbufs, 1); - if (error != 0) { - DPRINTF(sc, ATH_DBG_FATAL, - "Failed to allocate tx descriptors: %d\n", - error); - break; - } - - /* XXX allocate beacon state together with vap */ - error = ath_descdma_setup(sc, &sc->beacon.bdma, &sc->beacon.bbuf, - "beacon", ATH_BCBUF, 1); - if (error != 0) { - DPRINTF(sc, ATH_DBG_FATAL, - "Failed to allocate beacon descriptors: %d\n", - error); - break; - } + return sc->tx.txq[qnum].axq_depth; +} - } while (0); +static void ath_get_beaconconfig(struct ath_softc *sc, int if_id, + struct ath_beacon_config *conf) +{ + struct ieee80211_hw *hw = sc->hw; - if (error != 0) - ath_tx_cleanup(sc); + /* fill in beacon config data */ - return error; + conf->beacon_interval = hw->conf.beacon_int; + conf->listen_interval = 100; + conf->dtim_count = 1; + conf->bmiss_timeout = ATH_DEFAULT_BMISS_LIMIT * conf->listen_interval; } -/* Reclaim all tx queue resources */ - -int ath_tx_cleanup(struct ath_softc *sc) +static void ath_txq_drain_pending_buffers(struct ath_softc *sc, + struct ath_txq *txq) { - /* cleanup beacon descriptors */ - if (sc->beacon.bdma.dd_desc_len != 0) - ath_descdma_cleanup(sc, &sc->beacon.bdma, &sc->beacon.bbuf); - - /* cleanup tx descriptors */ - if (sc->tx.txdma.dd_desc_len != 0) - ath_descdma_cleanup(sc, &sc->tx.txdma, &sc->tx.txbuf); + struct ath_atx_ac *ac, *ac_tmp; + struct ath_atx_tid *tid, *tid_tmp; - return 0; + 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); + } + } } -/* 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; @@ -1959,43 +871,7 @@ struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype) return &sc->tx.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->tx.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->tx.hwq_map)) { - DPRINTF(sc, ATH_DBG_FATAL, - "HAL AC %u out of range, max %zu!\n", - haltype, ARRAY_SIZE(sc->tx.hwq_map)); - return 0; - } - txq = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, haltype); - if (txq != NULL) { - sc->tx.hwq_map[haltype] = txq->axq_qnum; - return 1; - } else - return 0; -} - -int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype) +static int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype) { int qnum; @@ -2021,8 +897,6 @@ int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype) return qnum; } -/* Get a transmit queue, if available */ - struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb) { struct ath_txq *txq = NULL; @@ -2033,7 +907,6 @@ struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb) spin_lock_bh(&txq->axq_lock); - /* Try to avoid running out of descriptors */ if (txq->axq_depth >= (ATH_TXBUF - 20)) { DPRINTF(sc, ATH_DBG_FATAL, "TX queue: %d is full, depth: %d\n", @@ -2049,8 +922,6 @@ struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb) return txq; } -/* Update parameters for a transmit queue */ - int ath_txq_update(struct ath_softc *sc, int qnum, struct ath9k_tx_queue_info *qinfo) { @@ -2082,7 +953,7 @@ int ath_txq_update(struct ath_softc *sc, int qnum, "Unable to update hardware queue %u!\n", qnum); error = -EIO; } else { - ath9k_hw_resettxqueue(ah, qnum); /* push to h/w */ + ath9k_hw_resettxqueue(ah, qnum); } return error; @@ -2111,36 +982,19 @@ int ath_cabq_update(struct ath_softc *sc) return 0; } -/* 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->tx.txq[i]); - } -} - -void ath_tx_draintxq(struct ath_softc *sc, - struct ath_txq *txq, bool retry_tx) +/* + * Drain a given TX queue (could be Beacon or Data) + * + * This assumes output has been stopped and + * we do not need to block ath_tx_tasklet. + */ +void ath_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); @@ -2175,7 +1029,7 @@ void ath_tx_draintxq(struct ath_softc *sc, spin_unlock_bh(&txq->axq_lock); if (bf_isampdu(bf)) - ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, 0); + ath_tx_complete_aggr(sc, txq, bf, &bf_head, 0); else ath_tx_complete_buf(sc, bf, &bf_head, 0, 0); } @@ -2190,44 +1044,272 @@ void ath_tx_draintxq(struct ath_softc *sc, } } -/* Drain the transmit queues and reclaim resources */ +void ath_drain_all_txq(struct ath_softc *sc, bool retry_tx) +{ + struct ath_hal *ah = sc->sc_ah; + struct ath_txq *txq; + int i, npend = 0; + + if (sc->sc_flags & SC_OP_INVALID) + return; + + /* Stop beacon queue */ + ath9k_hw_stoptxdma(sc->sc_ah, sc->beacon.beaconq); + + /* Stop data queues */ + for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) { + if (ATH_TXQ_SETUP(sc, i)) { + txq = &sc->tx.txq[i]; + ath9k_hw_stoptxdma(ah, txq->axq_qnum); + npend += ath9k_hw_numtxpending(ah, txq->axq_qnum); + } + } + + if (npend) { + int r; + + DPRINTF(sc, ATH_DBG_XMIT, "Unable to stop TxDMA. Reset HAL!\n"); + + spin_lock_bh(&sc->sc_resetlock); + r = ath9k_hw_reset(ah, sc->sc_ah->ah_curchan, true); + if (r) + DPRINTF(sc, ATH_DBG_FATAL, + "Unable to reset hardware; reset status %u\n", + r); + spin_unlock_bh(&sc->sc_resetlock); + } + + for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) { + if (ATH_TXQ_SETUP(sc, i)) + ath_draintxq(sc, &sc->tx.txq[i], retry_tx); + } +} + +void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq) +{ + ath9k_hw_releasetxqueue(sc->sc_ah, txq->axq_qnum); + sc->tx.txqsetup &= ~(1<<txq->axq_qnum); +} -void ath_draintxq(struct ath_softc *sc, bool retry_tx) +void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq) { - /* 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->beacon.beaconq); - DPRINTF(sc, ATH_DBG_XMIT, "beacon queue %x\n", - ath9k_hw_gettxbuf(sc->sc_ah, sc->beacon.beaconq)); + struct ath_atx_ac *ac; + struct ath_atx_tid *tid; + + if (list_empty(&txq->axq_acq)) + return; + + ac = list_first_entry(&txq->axq_acq, struct ath_atx_ac, list); + list_del(&ac->list); + ac->sched = false; + + do { + 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) + continue; + + if ((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); + + break; + } while (!list_empty(&ac->tid_q)); + + if (!list_empty(&ac->tid_q)) { + if (!ac->sched) { + ac->sched = true; + list_add_tail(&ac->list, &txq->axq_acq); + } } +} - ath_drain_txdataq(sc, retry_tx); +int ath_tx_setup(struct ath_softc *sc, int haltype) +{ + struct ath_txq *txq; + + if (haltype >= ARRAY_SIZE(sc->tx.hwq_map)) { + DPRINTF(sc, ATH_DBG_FATAL, + "HAL AC %u out of range, max %zu!\n", + haltype, ARRAY_SIZE(sc->tx.hwq_map)); + return 0; + } + txq = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, haltype); + if (txq != NULL) { + sc->tx.hwq_map[haltype] = txq->axq_qnum; + return 1; + } else + return 0; } -u32 ath_txq_depth(struct ath_softc *sc, int qnum) +/***********/ +/* TX, DMA */ +/***********/ + +/* + * Insert a chain of ath_buf (descriptors) on a txq and + * assume the descriptors are already chained together by caller. + */ +static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq, + struct list_head *head) { - return sc->tx.txq[qnum].axq_depth; + 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, + "qnum: %d, txq depth: %d\n", txq->axq_qnum, txq->axq_depth); + + if (txq->axq_link == NULL) { + ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr); + DPRINTF(sc, ATH_DBG_XMIT, + "TXDP[%u] = %llx (%p)\n", + txq->axq_qnum, ito64(bf->bf_daddr), bf->bf_desc); + } else { + *txq->axq_link = bf->bf_daddr; + DPRINTF(sc, ATH_DBG_XMIT, "link[%u] (%p)=%llx (%p)\n", + 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); } -u32 ath_txq_aggr_depth(struct ath_softc *sc, int qnum) +static struct ath_buf *ath_tx_get_buffer(struct ath_softc *sc) { - return sc->tx.txq[qnum].axq_aggr_depth; + struct ath_buf *bf = NULL; + + spin_lock_bh(&sc->tx.txbuflock); + + if (unlikely(list_empty(&sc->tx.txbuf))) { + spin_unlock_bh(&sc->tx.txbuflock); + return NULL; + } + + bf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list); + list_del(&bf->list); + + spin_unlock_bh(&sc->tx.txbuflock); + + return bf; } -bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno) +static void ath_tx_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid, + struct list_head *bf_head, + struct ath_tx_control *txctl) { - struct ath_atx_tid *txtid; + struct ath_buf *bf; - if (!(sc->sc_flags & SC_OP_TXAGGR)) - return false; + bf = list_first_entry(bf_head, struct ath_buf, list); + bf->bf_state.bf_type |= BUF_AMPDU; - txtid = ATH_AN_2_TID(an, 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) || + txctl->txq->axq_depth >= ATH_AGGR_MIN_QDEPTH) { + /* + * Add this frame to software queue for scheduling later + * for aggregation. + */ + list_move_tail(&bf->list, &tid->buf_q); + ath_tx_queue_tid(txctl->txq, tid); + return; + } - if (!(txtid->state & AGGR_ADDBA_COMPLETE)) { - if (!(txtid->state & AGGR_ADDBA_PROGRESS) && - (txtid->addba_exchangeattempts < ADDBA_EXCHANGE_ATTEMPTS)) { - txtid->addba_exchangeattempts++; + /* 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; + ath_buf_set_rate(sc, bf); + ath_tx_txqaddbuf(sc, txctl->txq, bf_head); +} + +static void 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; + + bf = list_first_entry(bf_head, struct ath_buf, list); + bf->bf_state.bf_type &= ~BUF_AMPDU; + + /* update starting sequence number for subsequent ADDBA request */ + INCR(tid->seq_start, IEEE80211_SEQ_MAX); + + bf->bf_nframes = 1; + bf->bf_lastbf = bf; + ath_buf_set_rate(sc, bf); + ath_tx_txqaddbuf(sc, txq, bf_head); +} + +static enum ath9k_pkt_type get_hw_packet_type(struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr; + enum ath9k_pkt_type htype; + __le16 fc; + + hdr = (struct ieee80211_hdr *)skb->data; + fc = hdr->frame_control; + + 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 bool is_pae(struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr; + __le16 fc; + + hdr = (struct ieee80211_hdr *)skb->data; + fc = hdr->frame_control; + + if (ieee80211_is_data(fc)) { + if (ieee80211_is_nullfunc(fc) || + /* Port Access Entity (IEEE 802.1X) */ + (skb->protocol == cpu_to_be16(ETH_P_PAE))) { return true; } } @@ -2235,175 +1317,803 @@ bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno) return false; } -/* Start TX aggregation */ +static int get_hw_crypto_keytype(struct sk_buff *skb) +{ + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); -int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta, - u16 tid, u16 *ssn) + if (tx_info->control.hw_key) { + if (tx_info->control.hw_key->alg == ALG_WEP) + return ATH9K_KEY_TYPE_WEP; + else if (tx_info->control.hw_key->alg == ALG_TKIP) + return ATH9K_KEY_TYPE_TKIP; + else if (tx_info->control.hw_key->alg == ALG_CCMP) + return ATH9K_KEY_TYPE_AES; + } + + return ATH9K_KEY_TYPE_CLEAR; +} + +static void assign_aggr_tid_seqno(struct sk_buff *skb, + struct ath_buf *bf) { - struct ath_atx_tid *txtid; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + struct ieee80211_hdr *hdr; struct ath_node *an; + struct ath_atx_tid *tid; + __le16 fc; + u8 *qc; - an = (struct ath_node *)sta->drv_priv; + if (!tx_info->control.sta) + return; - if (sc->sc_flags & SC_OP_TXAGGR) { - txtid = ATH_AN_2_TID(an, tid); - txtid->state |= AGGR_ADDBA_PROGRESS; - ath_tx_pause_tid(sc, txtid); + an = (struct ath_node *)tx_info->control.sta->drv_priv; + hdr = (struct ieee80211_hdr *)skb->data; + fc = hdr->frame_control; + + if (ieee80211_is_data_qos(fc)) { + qc = ieee80211_get_qos_ctl(hdr); + bf->bf_tidno = qc[0] & 0xf; } - return 0; + /* + * 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. + * + * If fragmentation is on, the sequence number is + * not overridden, since it has been + * incremented by the fragmentation routine. + * + * FIXME: check if the fragmentation threshold exceeds + * IEEE80211 max. + */ + tid = ATH_AN_2_TID(an, bf->bf_tidno); + hdr->seq_ctrl = cpu_to_le16(tid->seq_next << + IEEE80211_SEQ_SEQ_SHIFT); + bf->bf_seqno = tid->seq_next; + INCR(tid->seq_next, IEEE80211_SEQ_MAX); } -/* Stop tx aggregation */ - -int ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid) +static int setup_tx_flags(struct ath_softc *sc, struct sk_buff *skb, + struct ath_txq *txq) { - struct ath_node *an = (struct ath_node *)sta->drv_priv; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + int flags = 0; - ath_tx_aggr_teardown(sc, an, tid); - return 0; + flags |= ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */ + flags |= ATH9K_TXDESC_INTREQ; + + if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK) + flags |= ATH9K_TXDESC_NOACK; + if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) + flags |= ATH9K_TXDESC_RTSENA; + + return flags; } -/* Resume tx aggregation */ +/* + * 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) +{ + struct ath_rate_table *rate_table = sc->cur_rate_table; + u32 nbits, nsymbits, duration, nsymbols; + u8 rc; + int streams, pktlen; -void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid) + pktlen = bf_isaggr(bf) ? bf->bf_al : bf->bf_frmlen; + rc = rate_table->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, rate_table, 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; +} + +static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf) { - struct ath_atx_tid *txtid; - struct ath_node *an; + struct ath_hal *ah = sc->sc_ah; + struct ath_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]; + struct sk_buff *skb; + struct ieee80211_tx_info *tx_info; + struct ieee80211_tx_rate *rates; + struct ieee80211_hdr *hdr; + struct ieee80211_hw *hw = sc->hw; + int i, flags, rtsctsena = 0, enable_g_protection = 0; + u32 ctsduration = 0; + u8 rix = 0, cix, ctsrate = 0; + __le16 fc; - an = (struct ath_node *)sta->drv_priv; + memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4); - if (sc->sc_flags & SC_OP_TXAGGR) { - txtid = ATH_AN_2_TID(an, tid); - txtid->baw_size = - IEEE80211_MIN_AMPDU_BUF << sta->ht_cap.ampdu_factor; - txtid->state |= AGGR_ADDBA_COMPLETE; - txtid->state &= ~AGGR_ADDBA_PROGRESS; - ath_tx_resume_tid(sc, txtid); + skb = (struct sk_buff *)bf->bf_mpdu; + hdr = (struct ieee80211_hdr *)skb->data; + fc = hdr->frame_control; + tx_info = IEEE80211_SKB_CB(skb); + rates = tx_info->control.rates; + + if (ieee80211_has_morefrags(fc) || + (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) { + rates[1].count = rates[2].count = rates[3].count = 0; + rates[1].idx = rates[2].idx = rates[3].idx = 0; + rates[0].count = ATH_TXMAXTRY; + } + + /* get the cix for the lowest valid rix */ + rt = sc->cur_rate_table; + for (i = 3; i >= 0; i--) { + if (rates[i].count && (rates[i].idx >= 0)) { + rix = rates[i].idx; + break; + } + } + + flags = (bf->bf_flags & (ATH9K_TXDESC_RTSENA | ATH9K_TXDESC_CTSENA)); + cix = rt->info[rix].ctrl_rate; + + /* All protection frames are transmited at 2Mb/s for 802.11g, + * otherwise we transmit them at 1Mb/s */ + if (hw->conf.channel->band == IEEE80211_BAND_2GHZ && + !conf_is_ht(&hw->conf)) + enable_g_protection = 1; + + /* + * 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 && !(bf->bf_flags & ATH9K_TXDESC_NOACK) + && (rt->info[rix].phy == WLAN_RC_PHY_OFDM || + WLAN_RC_PHY_HT(rt->info[rix].phy))) { + 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[enable_g_protection].ctrl_rate; + 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)) { + /* 802.11g protection not needed, use our default behavior */ + if (!rtsctsena) + flags = ATH9K_TXDESC_RTSENA; + } + + /* 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[enable_g_protection].ctrl_rate; + rtsctsena = 1; + } + + /* For AR5416 - RTS cannot be followed by a frame larger than 8K */ + if (bf_isaggr(bf) && (bf->bf_al > ah->ah_caps.rts_aggr_limit)) + 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 + */ + ctsrate = rt->info[cix].ratecode | + (bf_isshpreamble(bf) ? rt->info[cix].short_preamble : 0); + + for (i = 0; i < 4; i++) { + if (!rates[i].count || (rates[i].idx < 0)) + continue; + + rix = rates[i].idx; + + series[i].Rate = rt->info[rix].ratecode | + (bf_isshpreamble(bf) ? rt->info[rix].short_preamble : 0); + + series[i].Tries = rates[i].count; + + series[i].RateFlags = ( + (rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) ? + ATH9K_RATESERIES_RTS_CTS : 0) | + ((rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ? + ATH9K_RATESERIES_2040 : 0) | + ((rates[i].flags & IEEE80211_TX_RC_SHORT_GI) ? + ATH9K_RATESERIES_HALFGI : 0); + + series[i].PktDuration = ath_pkt_duration(sc, rix, bf, + (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) != 0, + (rates[i].flags & IEEE80211_TX_RC_SHORT_GI), + bf_isshpreamble(bf)); + + series[i].ChSel = sc->sc_tx_chainmask; + + if (rtsctsena) + series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS; } + + /* 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); } -/* - * 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. - */ +static int ath_tx_setup_buffer(struct ath_softc *sc, struct ath_buf *bf, + struct sk_buff *skb, + struct ath_tx_control *txctl) +{ + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct ath_tx_info_priv *tx_info_priv; + int hdrlen; + __le16 fc; + + tx_info_priv = kzalloc(sizeof(*tx_info_priv), GFP_ATOMIC); + if (unlikely(!tx_info_priv)) + return -ENOMEM; + tx_info->rate_driver_data[0] = tx_info_priv; + hdrlen = ieee80211_get_hdrlen_from_skb(skb); + fc = hdr->frame_control; + + ATH_TXBUF_RESET(bf); + + bf->bf_frmlen = skb->len + FCS_LEN - (hdrlen & 3); + + if (ieee80211_is_data(fc)) + bf->bf_state.bf_type |= BUF_DATA; + if (ieee80211_is_back_req(fc)) + bf->bf_state.bf_type |= BUF_BAR; + if (ieee80211_is_pspoll(fc)) + bf->bf_state.bf_type |= BUF_PSPOLL; + if (sc->sc_flags & SC_OP_PREAMBLE_SHORT) + bf->bf_state.bf_type |= BUF_SHORT_PREAMBLE; + if ((conf_is_ht(&sc->hw->conf) && !is_pae(skb) && + (tx_info->flags & IEEE80211_TX_CTL_AMPDU))) + bf->bf_state.bf_type |= BUF_HT; + + bf->bf_flags = setup_tx_flags(sc, skb, txctl->txq); + + bf->bf_keytype = get_hw_crypto_keytype(skb); + if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR) { + bf->bf_frmlen += tx_info->control.hw_key->icv_len; + bf->bf_keyix = tx_info->control.hw_key->hw_key_idx; + } else { + bf->bf_keyix = ATH9K_TXKEYIX_INVALID; + } + + if (ieee80211_is_data_qos(fc) && (sc->sc_flags & SC_OP_TXAGGR)) + assign_aggr_tid_seqno(skb, bf); + + bf->bf_mpdu = skb; + + bf->bf_dmacontext = dma_map_single(sc->dev, skb->data, + skb->len, DMA_TO_DEVICE); + if (unlikely(dma_mapping_error(sc->dev, bf->bf_dmacontext))) { + bf->bf_mpdu = NULL; + DPRINTF(sc, ATH_DBG_CONFIG, + "dma_mapping_error() on TX\n"); + return -ENOMEM; + } + + bf->bf_buf_addr = bf->bf_dmacontext; + return 0; +} -void ath_tx_aggr_teardown(struct ath_softc *sc, struct ath_node *an, u8 tid) +/* FIXME: tx power */ +static void ath_tx_start_dma(struct ath_softc *sc, struct ath_buf *bf, + struct ath_tx_control *txctl) { - struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid); - struct ath_txq *txq = &sc->tx.txq[txtid->ac->qnum]; - struct ath_buf *bf; + struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + struct ath_node *an = NULL; struct list_head bf_head; + struct ath_desc *ds; + struct ath_atx_tid *tid; + struct ath_hal *ah = sc->sc_ah; + int frm_type; + + frm_type = get_hw_packet_type(skb); + INIT_LIST_HEAD(&bf_head); + list_add_tail(&bf->list, &bf_head); - if (txtid->state & AGGR_CLEANUP) /* cleanup is in progress */ - return; + ds = bf->bf_desc; + ds->ds_link = 0; + ds->ds_data = bf->bf_buf_addr; - if (!(txtid->state & AGGR_ADDBA_COMPLETE)) { - txtid->addba_exchangeattempts = 0; - return; - } + ath9k_hw_set11n_txdesc(ah, ds, bf->bf_frmlen, frm_type, MAX_RATE_POWER, + bf->bf_keyix, bf->bf_keytype, bf->bf_flags); - /* TID must be paused first */ - ath_tx_pause_tid(sc, txtid); + ath9k_hw_filltxdesc(ah, ds, + skb->len, /* segment length */ + true, /* first segment */ + true, /* last segment */ + ds); /* first descriptor */ - /* 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)) { + spin_lock_bh(&txctl->txq->axq_lock); + + if (bf_isht(bf) && (sc->sc_flags & SC_OP_TXAGGR) && + tx_info->control.sta) { + an = (struct ath_node *)tx_info->control.sta->drv_priv; + tid = ATH_AN_2_TID(an, bf->bf_tidno); + + if (ath_aggr_query(sc, an, bf->bf_tidno)) { /* - * NB: it's based on the assumption that - * software retried frame will always stay - * at the head of software queue. + * Try aggregation if it's a unicast data frame + * and the destination is HT capable. */ - break; + ath_tx_send_ampdu(sc, tid, &bf_head, txctl); + } else { + /* + * Send this frame as regular when ADDBA + * exchange is neither complete nor pending. + */ + ath_tx_send_normal(sc, txctl->txq, + tid, &bf_head); } - list_cut_position(&bf_head, - &txtid->buf_q, &bf->bf_lastfrm->list); - ath_tx_update_baw(sc, txtid, bf->bf_seqno); + } else { + bf->bf_lastbf = bf; + bf->bf_nframes = 1; - /* complete this sub-frame */ - ath_tx_complete_buf(sc, bf, &bf_head, 0, 0); + ath_buf_set_rate(sc, bf); + ath_tx_txqaddbuf(sc, txctl->txq, &bf_head); } - if (txtid->baw_head != txtid->baw_tail) { - spin_unlock_bh(&txq->axq_lock); - txtid->state |= AGGR_CLEANUP; - } else { - txtid->state &= ~AGGR_ADDBA_COMPLETE; - txtid->addba_exchangeattempts = 0; + spin_unlock_bh(&txctl->txq->axq_lock); +} + +/* Upon failure caller should free skb */ +int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb, + struct ath_tx_control *txctl) +{ + struct ath_buf *bf; + int r; + + bf = ath_tx_get_buffer(sc); + if (!bf) { + DPRINTF(sc, ATH_DBG_XMIT, "TX buffers are full\n"); + return -1; + } + + r = ath_tx_setup_buffer(sc, bf, skb, txctl); + if (unlikely(r)) { + struct ath_txq *txq = txctl->txq; + + DPRINTF(sc, ATH_DBG_FATAL, "TX mem alloc failure\n"); + + /* upon ath_tx_processq() this TX queue will be resumed, we + * guarantee this will happen by knowing beforehand that + * we will at least have to run TX completionon one buffer + * on the queue */ + spin_lock_bh(&txq->axq_lock); + if (ath_txq_depth(sc, txq->axq_qnum) > 1) { + ieee80211_stop_queue(sc->hw, + skb_get_queue_mapping(skb)); + txq->stopped = 1; + } spin_unlock_bh(&txq->axq_lock); - ath_tx_flush_tid(sc, txtid); + + spin_lock_bh(&sc->tx.txbuflock); + list_add_tail(&bf->list, &sc->tx.txbuf); + spin_unlock_bh(&sc->tx.txbuflock); + + return r; } -} -/* - * Tx scheduling logic - * NB: must be called with txq lock held - */ + ath_tx_start_dma(sc, bf, txctl); -void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq) + return 0; +} + +void ath_tx_cabq(struct ath_softc *sc, struct sk_buff *skb) { - struct ath_atx_ac *ac; - struct ath_atx_tid *tid; + int hdrlen, padsize; + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct ath_tx_control txctl; - /* 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; + memset(&txctl, 0, sizeof(struct ath_tx_control)); /* - * process a single tid per destination + * As a temporary workaround, assign seq# here; this will likely need + * to be cleaned up to work better with Beacon transmission and virtual + * BSSes. */ - do { - /* nothing to schedule */ - if (list_empty(&ac->tid_q)) + 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->tx.seq_no += 0x10; + hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); + hdr->seq_ctrl |= cpu_to_le16(sc->tx.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, "TX CABQ padding failed\n"); + dev_kfree_skb_any(skb); return; + } + skb_push(skb, padsize); + memmove(skb->data, skb->data + padsize, hdrlen); + } - tid = list_first_entry(&ac->tid_q, struct ath_atx_tid, list); - list_del(&tid->list); - tid->sched = false; + txctl.txq = sc->beacon.cabq; - if (tid->paused) /* check next tid to keep h/w busy */ - continue; + DPRINTF(sc, ATH_DBG_XMIT, "transmitting CABQ packet, skb: %p\n", skb); - if ((txq->axq_depth % 2) == 0) - ath_tx_sched_aggr(sc, txq, tid); + if (ath_tx_start(sc, skb, &txctl) != 0) { + DPRINTF(sc, ATH_DBG_XMIT, "CABQ TX failed\n"); + goto exit; + } + + return; +exit: + dev_kfree_skb_any(skb); +} + +/*****************/ +/* TX Completion */ +/*****************/ + +static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb, + struct ath_xmit_status *tx_status) +{ + struct ieee80211_hw *hw = sc->hw; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info); + int hdrlen, padsize; + + DPRINTF(sc, ATH_DBG_XMIT, "TX complete: skb: %p\n", skb); + + if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK || + tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED) { + kfree(tx_info_priv); + tx_info->rate_driver_data[0] = NULL; + } + + if (tx_status->flags & ATH_TX_BAR) { + tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK; + tx_status->flags &= ~ATH_TX_BAR; + } + + if (!(tx_status->flags & (ATH_TX_ERROR | ATH_TX_XRETRY))) { + /* Frame was ACKed */ + tx_info->flags |= IEEE80211_TX_STAT_ACK; + } + tx_info->status.rates[0].count = tx_status->retries + 1; + + hdrlen = ieee80211_get_hdrlen_from_skb(skb); + padsize = hdrlen & 3; + if (padsize && hdrlen >= 24) { /* - * add tid to round-robin queue if more frames - * are pending for the tid + * Remove MAC header padding before giving the frame back to + * mac80211. */ - if (!list_empty(&tid->buf_q)) - ath_tx_queue_tid(txq, tid); + memmove(skb->data + padsize, skb->data, hdrlen); + skb_pull(skb, padsize); + } - /* only schedule one TID at a time */ - break; - } while (!list_empty(&ac->tid_q)); + ieee80211_tx_status(hw, skb); +} + +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; + unsigned long flags; /* - * schedule AC if more TIDs need processing + * Set retry information. + * NB: Don't use the information in the descriptor, because the frame + * could be software retried. */ - if (!list_empty(&ac->tid_q)) { + 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; + } + + dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE); + ath_tx_complete(sc, skb, &tx_status); + + /* + * Return the list of ath_buf of this mpdu to free queue + */ + spin_lock_irqsave(&sc->tx.txbuflock, flags); + list_splice_tail_init(bf_q, &sc->tx.txbuf); + spin_unlock_irqrestore(&sc->tx.txbuflock, flags); +} + +static int ath_tx_num_badfrms(struct ath_softc *sc, struct ath_buf *bf, + int txok) +{ + 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 (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_rc_status(struct ath_buf *bf, struct ath_desc *ds, int nbad) +{ + struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info); + + tx_info_priv->update_rc = false; + 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 (bf_isdata(bf)) { + memcpy(&tx_info_priv->tx, &ds->ds_txstat, + sizeof(tx_info_priv->tx)); + tx_info_priv->n_frames = bf->bf_nframes; + tx_info_priv->n_bad_frames = nbad; + tx_info_priv->update_rc = true; + } + } +} + +static void ath_wake_mac80211_queue(struct ath_softc *sc, struct ath_txq *txq) +{ + int qnum; + + spin_lock_bh(&txq->axq_lock); + if (txq->stopped && + ath_txq_depth(sc, txq->axq_qnum) <= (ATH_TXBUF - 20)) { + qnum = ath_get_mac80211_qnum(txq->axq_qnum, sc); + if (qnum != -1) { + ieee80211_wake_queue(sc->hw, qnum); + txq->stopped = 0; + } + } + spin_unlock_bh(&txq->axq_lock); +} + +static void 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; + int txok, nbad = 0; + int status; + + DPRINTF(sc, ATH_DBG_QUEUE, "tx queue %d (%x), link %p\n", + txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum), + txq->axq_link); + + 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); + /* - * add dest ac to txq if not already added + * 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. */ - if (!ac->sched) { - ac->sched = true; - list_add_tail(&ac->list, &txq->axq_acq); + bf_held = NULL; + if (bf->bf_status & ATH_BUFSTATUS_STALE) { + bf_held = bf; + if (list_is_last(&bf_held->list, &txq->axq_q)) { + txq->axq_link = NULL; + txq->axq_linkbuf = NULL; + spin_unlock_bh(&txq->axq_lock); + + /* + * The holding descriptor is the last + * descriptor in queue. It's safe to remove + * the last holding descriptor in BH context. + */ + spin_lock_bh(&sc->tx.txbuflock); + list_move_tail(&bf_held->list, &sc->tx.txbuf); + spin_unlock_bh(&sc->tx.txbuflock); + + break; + } else { + bf = list_entry(bf_held->list.next, + struct ath_buf, list); + } + } + + lastbf = bf->bf_lastbf; + ds = lastbf->bf_desc; + + 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) { + spin_lock_bh(&sc->tx.txbuflock); + list_move_tail(&bf_held->list, &sc->tx.txbuf); + spin_unlock_bh(&sc->tx.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); + } + + ath_tx_rc_status(bf, ds, nbad); + + if (bf_isampdu(bf)) + ath_tx_complete_aggr(sc, txq, bf, &bf_head, txok); + else + ath_tx_complete_buf(sc, bf, &bf_head, txok, 0); + + ath_wake_mac80211_queue(sc, txq); + + spin_lock_bh(&txq->axq_lock); + if (sc->sc_flags & SC_OP_TXAGGR) + ath_txq_schedule(sc, txq); + spin_unlock_bh(&txq->axq_lock); + } +} + + +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); + + for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) { + if (ATH_TXQ_SETUP(sc, i) && (qcumask & (1 << i))) + ath_tx_processq(sc, &sc->tx.txq[i]); } } -/* Initialize per-node transmit state */ +/*****************/ +/* Init, Cleanup */ +/*****************/ + +int ath_tx_init(struct ath_softc *sc, int nbufs) +{ + int error = 0; + + do { + spin_lock_init(&sc->tx.txbuflock); + + error = ath_descdma_setup(sc, &sc->tx.txdma, &sc->tx.txbuf, + "tx", nbufs, 1); + if (error != 0) { + DPRINTF(sc, ATH_DBG_FATAL, + "Failed to allocate tx descriptors: %d\n", + error); + break; + } + + error = ath_descdma_setup(sc, &sc->beacon.bdma, &sc->beacon.bbuf, + "beacon", ATH_BCBUF, 1); + if (error != 0) { + DPRINTF(sc, ATH_DBG_FATAL, + "Failed to allocate beacon descriptors: %d\n", + error); + break; + } + + } while (0); + + if (error != 0) + ath_tx_cleanup(sc); + + return error; +} + +int ath_tx_cleanup(struct ath_softc *sc) +{ + if (sc->beacon.bdma.dd_desc_len != 0) + ath_descdma_cleanup(sc, &sc->beacon.bdma, &sc->beacon.bbuf); + + if (sc->tx.txdma.dd_desc_len != 0) + ath_descdma_cleanup(sc, &sc->tx.txdma, &sc->tx.txbuf); + + return 0; +} void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an) { @@ -2411,9 +2121,6 @@ void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an) struct ath_atx_ac *ac; int tidno, acno; - /* - * Init per tid tx state - */ for (tidno = 0, tid = &an->tid[tidno]; tidno < WME_NUM_TID; tidno++, tid++) { @@ -2423,22 +2130,16 @@ void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an) tid->baw_size = WME_MAX_BA; tid->baw_head = tid->baw_tail = 0; tid->sched = false; - tid->paused = false; + tid->paused = false; tid->state &= ~AGGR_CLEANUP; INIT_LIST_HEAD(&tid->buf_q); - acno = TID_TO_WME_AC(tidno); tid->ac = &an->ac[acno]; - - /* ADDBA state */ tid->state &= ~AGGR_ADDBA_COMPLETE; tid->state &= ~AGGR_ADDBA_PROGRESS; tid->addba_exchangeattempts = 0; } - /* - * Init per ac tx state - */ for (acno = 0, ac = &an->ac[acno]; acno < WME_NUM_AC; acno++, ac++) { ac->sched = false; @@ -2465,14 +2166,13 @@ void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an) } } -/* Cleanupthe pending buffers for the node. */ - void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an) { 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->tx.txq[i]; @@ -2503,51 +2203,3 @@ void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an) } } } - -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; - - memset(&txctl, 0, sizeof(struct ath_tx_control)); - - /* - * 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->tx.seq_no += 0x10; - hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); - hdr->seq_ctrl |= cpu_to_le16(sc->tx.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, "TX CABQ padding failed\n"); - dev_kfree_skb_any(skb); - return; - } - skb_push(skb, padsize); - memmove(skb->data, skb->data + padsize, hdrlen); - } - - txctl.txq = sc->beacon.cabq; - - DPRINTF(sc, ATH_DBG_XMIT, "transmitting CABQ packet, skb: %p\n", skb); - - if (ath_tx_start(sc, skb, &txctl) != 0) { - DPRINTF(sc, ATH_DBG_XMIT, "CABQ TX failed\n"); - goto exit; - } - - return; -exit: - dev_kfree_skb_any(skb); -} |