#define ATH_MAX_ANTENNA 3
#define ATH_RXBUF 512
-#define ATH_RX_TIMEOUT 40 /* 40 milliseconds */
#define WME_NUM_TID 16
-#define IEEE80211_BAR_CTL_TID_M 0xF000 /* tid mask */
-#define IEEE80211_BAR_CTL_TID_S 12 /* tid shift */
-
-enum ATH_RX_TYPE {
- ATH_RX_NON_CONSUMED = 0,
- ATH_RX_CONSUMED
-};
/* per frame rx status block */
struct ath_recv_status {
struct ath_recv_status rx_status; /* cached rx status */
};
-/* Per-TID aggregate receiver state for a node */
-struct ath_arx_tid {
- struct ath_node *an;
- struct ath_rxbuf *rxbuf; /* re-ordering buffer */
- struct timer_list timer;
- spinlock_t tidlock;
- int baw_head; /* seq_next at head */
- int baw_tail; /* tail of block-ack window */
- int seq_reset; /* need to reset start sequence */
- int addba_exchangecomplete;
- u16 seq_next; /* next expected sequence */
- u16 baw_size; /* block-ack window size */
-};
-
-/* Per-node receiver aggregate state */
-struct ath_arx {
- struct ath_arx_tid tid[WME_NUM_TID];
-};
-
int ath_startrecv(struct ath_softc *sc);
bool ath_stoprecv(struct ath_softc *sc);
void ath_flushrecv(struct ath_softc *sc);
u32 ath_calcrxfilter(struct ath_softc *sc);
-void ath_rx_node_init(struct ath_softc *sc, struct ath_node *an);
-void ath_rx_node_cleanup(struct ath_softc *sc, struct ath_node *an);
void ath_handle_rx_intr(struct ath_softc *sc);
int ath_rx_init(struct ath_softc *sc, int nbufs);
void ath_rx_cleanup(struct ath_softc *sc);
int ath_rx_tasklet(struct ath_softc *sc, int flush);
-int ath_rx_input(struct ath_softc *sc,
- struct ath_node *node,
- struct sk_buff *skb,
- struct ath_recv_status *rx_status,
- enum ATH_RX_TYPE *status);
int _ath_rx_indicate(struct ath_softc *sc,
struct sk_buff *skb,
struct ath_recv_status *status,
u16 keyix);
-int ath_rx_subframe(struct ath_node *an, struct sk_buff *skb,
- struct ath_recv_status *status);
-
/******/
/* TX */
/******/
/* Per-node aggregation state */
struct ath_node_aggr {
struct ath_atx tx; /* node transmit state */
- struct ath_arx rx; /* node receive state */
};
/* driver-specific node state */
bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno);
void ath_tx_aggr_teardown(struct ath_softc *sc,
struct ath_node *an, u8 tidno);
-void ath_rx_aggr_teardown(struct ath_softc *sc,
- struct ath_node *an, u8 tidno);
-int ath_rx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
- u16 tid, u16 *ssn);
-int ath_rx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid);
int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
u16 tid, u16 *ssn);
int ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid);
ath9k_hw_rxena(ah);
}
-/* Process received BAR frame */
-
-static int ath_bar_rx(struct ath_softc *sc,
- struct ath_node *an,
- struct sk_buff *skb)
-{
- struct ieee80211_bar *bar;
- struct ath_arx_tid *rxtid;
- struct sk_buff *tskb;
- struct ath_recv_status *rx_status;
- int tidno, index, cindex;
- u16 seqno;
-
- /* look at BAR contents */
-
- bar = (struct ieee80211_bar *)skb->data;
- tidno = (le16_to_cpu(bar->control) & IEEE80211_BAR_CTL_TID_M)
- >> IEEE80211_BAR_CTL_TID_S;
- seqno = le16_to_cpu(bar->start_seq_num) >> IEEE80211_SEQ_SEQ_SHIFT;
-
- /* process BAR - indicate all pending RX frames till the BAR seqno */
-
- rxtid = &an->an_aggr.rx.tid[tidno];
-
- spin_lock_bh(&rxtid->tidlock);
-
- /* get relative index */
-
- index = ATH_BA_INDEX(rxtid->seq_next, seqno);
-
- /* drop BAR if old sequence (index is too large) */
-
- if ((index > rxtid->baw_size) &&
- (index > (IEEE80211_SEQ_MAX - (rxtid->baw_size << 2))))
- /* discard frame, ieee layer may not treat frame as a dup */
- goto unlock_and_free;
-
- /* complete receive processing for all pending frames upto BAR seqno */
-
- cindex = (rxtid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
- while ((rxtid->baw_head != rxtid->baw_tail) &&
- (rxtid->baw_head != cindex)) {
- tskb = rxtid->rxbuf[rxtid->baw_head].rx_wbuf;
- rx_status = &rxtid->rxbuf[rxtid->baw_head].rx_status;
- rxtid->rxbuf[rxtid->baw_head].rx_wbuf = NULL;
-
- if (tskb != NULL)
- ath_rx_subframe(an, tskb, rx_status);
-
- INCR(rxtid->baw_head, ATH_TID_MAX_BUFS);
- INCR(rxtid->seq_next, IEEE80211_SEQ_MAX);
- }
-
- /* ... and indicate rest of the frames in-order */
-
- while (rxtid->baw_head != rxtid->baw_tail &&
- rxtid->rxbuf[rxtid->baw_head].rx_wbuf != NULL) {
- tskb = rxtid->rxbuf[rxtid->baw_head].rx_wbuf;
- rx_status = &rxtid->rxbuf[rxtid->baw_head].rx_status;
- rxtid->rxbuf[rxtid->baw_head].rx_wbuf = NULL;
-
- ath_rx_subframe(an, tskb, rx_status);
-
- INCR(rxtid->baw_head, ATH_TID_MAX_BUFS);
- INCR(rxtid->seq_next, IEEE80211_SEQ_MAX);
- }
-
-unlock_and_free:
- spin_unlock_bh(&rxtid->tidlock);
- /* free bar itself */
- dev_kfree_skb(skb);
- return IEEE80211_FTYPE_CTL;
-}
-
-/* Function to handle a subframe of aggregation when HT is enabled */
-
-static int ath_ampdu_input(struct ath_softc *sc,
- struct ath_node *an,
- struct sk_buff *skb,
- struct ath_recv_status *rx_status)
-{
- struct ieee80211_hdr *hdr;
- struct ath_arx_tid *rxtid;
- struct ath_rxbuf *rxbuf;
- u8 type, subtype;
- u16 rxseq;
- int tid = 0, index, cindex, rxdiff;
- __le16 fc;
- u8 *qc;
-
- hdr = (struct ieee80211_hdr *)skb->data;
- fc = hdr->frame_control;
-
- /* collect stats of frames with non-zero version */
-
- if ((le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_VERS) != 0) {
- dev_kfree_skb(skb);
- return -1;
- }
-
- type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
- subtype = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE;
-
- if (ieee80211_is_back_req(fc))
- return ath_bar_rx(sc, an, skb);
-
- /* special aggregate processing only for qos unicast data frames */
-
- if (!ieee80211_is_data(fc) ||
- !ieee80211_is_data_qos(fc) ||
- is_multicast_ether_addr(hdr->addr1))
- return ath_rx_subframe(an, skb, rx_status);
-
- /* lookup rx tid state */
-
- if (ieee80211_is_data_qos(fc)) {
- qc = ieee80211_get_qos_ctl(hdr);
- tid = qc[0] & 0xf;
- }
-
- if (sc->sc_ah->ah_opmode == ATH9K_M_STA) {
- /* Drop the frame not belonging to me. */
- if (memcmp(hdr->addr1, sc->sc_myaddr, ETH_ALEN)) {
- dev_kfree_skb(skb);
- return -1;
- }
- }
-
- rxtid = &an->an_aggr.rx.tid[tid];
-
- spin_lock(&rxtid->tidlock);
-
- rxdiff = (rxtid->baw_tail - rxtid->baw_head) &
- (ATH_TID_MAX_BUFS - 1);
-
- /*
- * If the ADDBA exchange has not been completed by the source,
- * process via legacy path (i.e. no reordering buffer is needed)
- */
- if (!rxtid->addba_exchangecomplete) {
- spin_unlock(&rxtid->tidlock);
- return ath_rx_subframe(an, skb, rx_status);
- }
-
- /* extract sequence number from recvd frame */
-
- rxseq = le16_to_cpu(hdr->seq_ctrl) >> IEEE80211_SEQ_SEQ_SHIFT;
-
- if (rxtid->seq_reset) {
- rxtid->seq_reset = 0;
- rxtid->seq_next = rxseq;
- }
-
- index = ATH_BA_INDEX(rxtid->seq_next, rxseq);
-
- /* drop frame if old sequence (index is too large) */
-
- if (index > (IEEE80211_SEQ_MAX - (rxtid->baw_size << 2))) {
- /* discard frame, ieee layer may not treat frame as a dup */
- spin_unlock(&rxtid->tidlock);
- dev_kfree_skb(skb);
- return IEEE80211_FTYPE_DATA;
- }
-
- /* sequence number is beyond block-ack window */
-
- if (index >= rxtid->baw_size) {
-
- /* complete receive processing for all pending frames */
-
- while (index >= rxtid->baw_size) {
-
- rxbuf = rxtid->rxbuf + rxtid->baw_head;
-
- if (rxbuf->rx_wbuf != NULL) {
- ath_rx_subframe(an, rxbuf->rx_wbuf,
- &rxbuf->rx_status);
- rxbuf->rx_wbuf = NULL;
- }
-
- INCR(rxtid->baw_head, ATH_TID_MAX_BUFS);
- INCR(rxtid->seq_next, IEEE80211_SEQ_MAX);
-
- index--;
- }
- }
-
- /* add buffer to the recv ba window */
-
- cindex = (rxtid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
- rxbuf = rxtid->rxbuf + cindex;
-
- if (rxbuf->rx_wbuf != NULL) {
- spin_unlock(&rxtid->tidlock);
- /* duplicate frame */
- dev_kfree_skb(skb);
- return IEEE80211_FTYPE_DATA;
- }
-
- rxbuf->rx_wbuf = skb;
- rxbuf->rx_time = get_timestamp();
- rxbuf->rx_status = *rx_status;
-
- /* advance tail if sequence received is newer
- * than any received so far */
-
- if (index >= rxdiff) {
- rxtid->baw_tail = cindex;
- INCR(rxtid->baw_tail, ATH_TID_MAX_BUFS);
- }
-
- /* indicate all in-order received frames */
-
- while (rxtid->baw_head != rxtid->baw_tail) {
- rxbuf = rxtid->rxbuf + rxtid->baw_head;
- if (!rxbuf->rx_wbuf)
- break;
-
- ath_rx_subframe(an, rxbuf->rx_wbuf, &rxbuf->rx_status);
- rxbuf->rx_wbuf = NULL;
-
- INCR(rxtid->baw_head, ATH_TID_MAX_BUFS);
- INCR(rxtid->seq_next, IEEE80211_SEQ_MAX);
- }
-
- /*
- * start a timer to flush all received frames if there are pending
- * receive frames
- */
- if (rxtid->baw_head != rxtid->baw_tail)
- mod_timer(&rxtid->timer, ATH_RX_TIMEOUT);
- else
- del_timer_sync(&rxtid->timer);
-
- spin_unlock(&rxtid->tidlock);
- return IEEE80211_FTYPE_DATA;
-}
-
-/* Timer to flush all received sub-frames */
-
-static void ath_rx_timer(unsigned long data)
-{
- struct ath_arx_tid *rxtid = (struct ath_arx_tid *)data;
- struct ath_node *an = rxtid->an;
- struct ath_rxbuf *rxbuf;
- int nosched;
-
- spin_lock_bh(&rxtid->tidlock);
- while (rxtid->baw_head != rxtid->baw_tail) {
- rxbuf = rxtid->rxbuf + rxtid->baw_head;
- if (!rxbuf->rx_wbuf) {
- INCR(rxtid->baw_head, ATH_TID_MAX_BUFS);
- INCR(rxtid->seq_next, IEEE80211_SEQ_MAX);
- continue;
- }
-
- /*
- * Stop if the next one is a very recent frame.
- *
- * Call get_timestamp in every iteration to protect against the
- * case in which a new frame is received while we are executing
- * this function. Using a timestamp obtained before entering
- * the loop could lead to a very large time interval
- * (a negative value typecast to unsigned), breaking the
- * function's logic.
- */
- if ((get_timestamp() - rxbuf->rx_time) <
- (ATH_RX_TIMEOUT * HZ / 1000))
- break;
-
- ath_rx_subframe(an, rxbuf->rx_wbuf,
- &rxbuf->rx_status);
- rxbuf->rx_wbuf = NULL;
-
- INCR(rxtid->baw_head, ATH_TID_MAX_BUFS);
- INCR(rxtid->seq_next, IEEE80211_SEQ_MAX);
- }
-
- /*
- * start a timer to flush all received frames if there are pending
- * receive frames
- */
- if (rxtid->baw_head != rxtid->baw_tail)
- nosched = 0;
- else
- nosched = 1; /* no need to re-arm the timer again */
-
- spin_unlock_bh(&rxtid->tidlock);
-}
-
-/* Free all pending sub-frames in the re-ordering buffer */
-
-static void ath_rx_flush_tid(struct ath_softc *sc, struct ath_arx_tid *rxtid,
- int drop)
-{
- struct ath_rxbuf *rxbuf;
- unsigned long flag;
-
- spin_lock_irqsave(&rxtid->tidlock, flag);
- while (rxtid->baw_head != rxtid->baw_tail) {
- rxbuf = rxtid->rxbuf + rxtid->baw_head;
- if (!rxbuf->rx_wbuf) {
- INCR(rxtid->baw_head, ATH_TID_MAX_BUFS);
- INCR(rxtid->seq_next, IEEE80211_SEQ_MAX);
- continue;
- }
-
- if (drop)
- dev_kfree_skb(rxbuf->rx_wbuf);
- else
- ath_rx_subframe(rxtid->an,
- rxbuf->rx_wbuf,
- &rxbuf->rx_status);
-
- rxbuf->rx_wbuf = NULL;
-
- INCR(rxtid->baw_head, ATH_TID_MAX_BUFS);
- INCR(rxtid->seq_next, IEEE80211_SEQ_MAX);
- }
- spin_unlock_irqrestore(&rxtid->tidlock, flag);
-}
-
static struct sk_buff *ath_rxbuf_alloc(struct ath_softc *sc,
u32 len)
{
spin_unlock_bh(&sc->sc_rxflushlock);
}
-/* Process an individual frame */
-
-int ath_rx_input(struct ath_softc *sc,
- struct ath_node *an,
- struct sk_buff *skb,
- struct ath_recv_status *rx_status,
- enum ATH_RX_TYPE *status)
-{
- if (sc->sc_flags & SC_OP_RXAGGR) {
- *status = ATH_RX_CONSUMED;
- return ath_ampdu_input(sc, an, skb, rx_status);
- } else {
- *status = ATH_RX_NON_CONSUMED;
- return -1;
- }
-}
-
/* Process receive queue, as well as LED, etc. */
int ath_rx_tasklet(struct ath_softc *sc, int flush)
return 0;
#undef PA2DESC
}
-
-/* Process ADDBA request in per-TID data structure */
-
-int ath_rx_aggr_start(struct ath_softc *sc,
- struct ieee80211_sta *sta,
- u16 tid,
- u16 *ssn)
-{
- struct ath_arx_tid *rxtid;
- struct ath_node *an;
- struct ieee80211_hw *hw = sc->hw;
- struct ieee80211_supported_band *sband;
- u16 buffersize = 0;
-
- an = (struct ath_node *)sta->drv_priv;
- sband = hw->wiphy->bands[hw->conf.channel->band];
- buffersize = IEEE80211_MIN_AMPDU_BUF <<
- sband->ht_cap.ampdu_factor; /* FIXME */
-
- rxtid = &an->an_aggr.rx.tid[tid];
-
- spin_lock_bh(&rxtid->tidlock);
- if (sc->sc_flags & SC_OP_RXAGGR) {
- /* Allow aggregation reception
- * Adjust rx BA window size. Peer might indicate a
- * zero buffer size for a _dont_care_ condition.
- */
- if (buffersize)
- rxtid->baw_size = min(buffersize, rxtid->baw_size);
-
- /* set rx sequence number */
- rxtid->seq_next = *ssn;
-
- /* Allocate the receive buffers for this TID */
- DPRINTF(sc, ATH_DBG_AGGR,
- "%s: Allcating rxbuffer for TID %d\n", __func__, tid);
-
- if (rxtid->rxbuf == NULL) {
- /*
- * If the rxbuff is not NULL at this point, we *probably*
- * already allocated the buffer on a previous ADDBA,
- * and this is a subsequent ADDBA that got through.
- * Don't allocate, but use the value in the pointer,
- * we zero it out when we de-allocate.
- */
- rxtid->rxbuf = kmalloc(ATH_TID_MAX_BUFS *
- sizeof(struct ath_rxbuf), GFP_ATOMIC);
- }
- if (rxtid->rxbuf == NULL) {
- DPRINTF(sc, ATH_DBG_AGGR,
- "%s: Unable to allocate RX buffer, "
- "refusing ADDBA\n", __func__);
- } else {
- /* Ensure the memory is zeroed out (all internal
- * pointers are null) */
- memset(rxtid->rxbuf, 0, ATH_TID_MAX_BUFS *
- sizeof(struct ath_rxbuf));
- DPRINTF(sc, ATH_DBG_AGGR,
- "%s: Allocated @%p\n", __func__, rxtid->rxbuf);
-
- /* Allow aggregation reception */
- rxtid->addba_exchangecomplete = 1;
- }
- }
- spin_unlock_bh(&rxtid->tidlock);
-
- return 0;
-}
-
-/* Process DELBA */
-
-int ath_rx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
-{
- struct ath_node *an = (struct ath_node *)sta->drv_priv;
-
- ath_rx_aggr_teardown(sc, an, tid);
- return 0;
-}
-
-/* Rx aggregation tear down */
-
-void ath_rx_aggr_teardown(struct ath_softc *sc, struct ath_node *an, u8 tid)
-{
- struct ath_arx_tid *rxtid = &an->an_aggr.rx.tid[tid];
-
- if (!rxtid->addba_exchangecomplete)
- return;
-
- del_timer_sync(&rxtid->timer);
- ath_rx_flush_tid(sc, rxtid, 0);
- rxtid->addba_exchangecomplete = 0;
-
- /* De-allocate the receive buffer array allocated when addba started */
-
- if (rxtid->rxbuf) {
- DPRINTF(sc, ATH_DBG_AGGR,
- "%s: Deallocating TID %d rxbuff @%p\n",
- __func__, tid, rxtid->rxbuf);
- kfree(rxtid->rxbuf);
-
- /* Set pointer to null to avoid reuse*/
- rxtid->rxbuf = NULL;
- }
-}
-
-/* Initialize per-node receive state */
-
-void ath_rx_node_init(struct ath_softc *sc, struct ath_node *an)
-{
- struct ath_arx_tid *rxtid;
- int tidno;
-
- /* Init per tid rx state */
- for (tidno = 0, rxtid = &an->an_aggr.rx.tid[tidno];
- tidno < WME_NUM_TID;
- tidno++, rxtid++) {
- rxtid->an = an;
- rxtid->seq_reset = 1;
- rxtid->seq_next = 0;
- rxtid->baw_size = WME_MAX_BA;
- rxtid->baw_head = rxtid->baw_tail = 0;
-
- /*
- * Ensure the buffer pointer is null at this point
- * (needs to be allocated when addba is received)
- */
-
- rxtid->rxbuf = NULL;
- setup_timer(&rxtid->timer, ath_rx_timer,
- (unsigned long)rxtid);
- spin_lock_init(&rxtid->tidlock);
-
- /* ADDBA state */
- rxtid->addba_exchangecomplete = 0;
- }
-}
-
-void ath_rx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
-{
- struct ath_arx_tid *rxtid;
- int tidno, i;
-
- /* Init per tid rx state */
- for (tidno = 0, rxtid = &an->an_aggr.rx.tid[tidno];
- tidno < WME_NUM_TID;
- tidno++, rxtid++) {
-
- if (!rxtid->addba_exchangecomplete)
- continue;
-
- /* must cancel timer first */
- del_timer_sync(&rxtid->timer);
-
- /* drop any pending sub-frames */
- ath_rx_flush_tid(sc, rxtid, 1);
-
- for (i = 0; i < ATH_TID_MAX_BUFS; i++)
- ASSERT(rxtid->rxbuf[i].rx_wbuf == NULL);
-
- rxtid->addba_exchangecomplete = 0;
- }
-}
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff