ath9k: Add new Atheros IEEE 802.11n driver
This adds the new mac80211 11n ath9k Atheros driver. Only STA support
is currently enabled and tested.
Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Jack Howarth <howarth@bromo.msbb.uc.edu>
Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
new file mode 100644
index 0000000..8e14e64
--- /dev/null
+++ b/drivers/net/wireless/ath9k/recv.c
@@ -0,0 +1,1318 @@
+/*
+ * Copyright (c) 2008 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Implementation of receive path.
+ */
+
+#include "core.h"
+
+/*
+ * Setup and link descriptors.
+ *
+ * 11N: we can no longer afford to self link the last descriptor.
+ * MAC acknowledges BA status as long as it copies frames to host
+ * buffer (or rx fifo). This can incorrectly acknowledge packets
+ * to a sender if last desc is self-linked.
+ *
+ * NOTE: Caller should hold the rxbuf lock.
+ */
+
+static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ struct ath_desc *ds;
+ struct sk_buff *skb;
+
+ ATH_RXBUF_RESET(bf);
+
+ ds = bf->bf_desc;
+ ds->ds_link = 0; /* link to null */
+ ds->ds_data = bf->bf_buf_addr;
+
+ /* XXX For RADAR?
+ * virtual addr of the beginning of the buffer. */
+ skb = bf->bf_mpdu;
+ ASSERT(skb != NULL);
+ ds->ds_vdata = skb->data;
+
+ /* setup rx descriptors */
+ ath9k_hw_setuprxdesc(ah,
+ ds,
+ skb_tailroom(skb), /* buffer size */
+ 0);
+
+ if (sc->sc_rxlink == NULL)
+ ath9k_hw_putrxbuf(ah, bf->bf_daddr);
+ else
+ *sc->sc_rxlink = bf->bf_daddr;
+
+ sc->sc_rxlink = &ds->ds_link;
+ 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_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;
+
+ 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;
+ }
+
+ 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_bh(&rxtid->tidlock);
+}
+
+static struct sk_buff *ath_rxbuf_alloc(struct ath_softc *sc,
+ u32 len)
+{
+ struct sk_buff *skb;
+ u32 off;
+
+ /*
+ * Cache-line-align. This is important (for the
+ * 5210 at least) as not doing so causes bogus data
+ * in rx'd frames.
+ */
+
+ skb = dev_alloc_skb(len + sc->sc_cachelsz - 1);
+ if (skb != NULL) {
+ off = ((unsigned long) skb->data) % sc->sc_cachelsz;
+ if (off != 0)
+ skb_reserve(skb, sc->sc_cachelsz - off);
+ } else {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: skbuff alloc of size %u failed\n",
+ __func__, len);
+ return NULL;
+ }
+
+ return skb;
+}
+
+static void ath_rx_requeue(struct ath_softc *sc, struct sk_buff *skb)
+{
+ struct ath_buf *bf = ATH_RX_CONTEXT(skb)->ctx_rxbuf;
+
+ ASSERT(bf != NULL);
+
+ spin_lock_bh(&sc->sc_rxbuflock);
+ if (bf->bf_status & ATH_BUFSTATUS_STALE) {
+ /*
+ * This buffer is still held for hw acess.
+ * Mark it as free to be re-queued it later.
+ */
+ bf->bf_status |= ATH_BUFSTATUS_FREE;
+ } else {
+ /* XXX: we probably never enter here, remove after
+ * verification */
+ list_add_tail(&bf->list, &sc->sc_rxbuf);
+ ath_rx_buf_link(sc, bf);
+ }
+ spin_unlock_bh(&sc->sc_rxbuflock);
+}
+
+/*
+ * The skb indicated to upper stack won't be returned to us.
+ * So we have to allocate a new one and queue it by ourselves.
+ */
+static int ath_rx_indicate(struct ath_softc *sc,
+ struct sk_buff *skb,
+ struct ath_recv_status *status,
+ u16 keyix)
+{
+ struct ath_buf *bf = ATH_RX_CONTEXT(skb)->ctx_rxbuf;
+ struct sk_buff *nskb;
+ int type;
+
+ /* indicate frame to the stack, which will free the old skb. */
+ type = ath__rx_indicate(sc, skb, status, keyix);
+
+ /* allocate a new skb and queue it to for H/W processing */
+ nskb = ath_rxbuf_alloc(sc, sc->sc_rxbufsize);
+ if (nskb != NULL) {
+ bf->bf_mpdu = nskb;
+ bf->bf_buf_addr = ath_skb_map_single(sc,
+ nskb,
+ PCI_DMA_FROMDEVICE,
+ /* XXX: Remove get_dma_mem_context() */
+ get_dma_mem_context(bf, bf_dmacontext));
+ ATH_RX_CONTEXT(nskb)->ctx_rxbuf = bf;
+
+ /* queue the new wbuf to H/W */
+ ath_rx_requeue(sc, nskb);
+ }
+
+ return type;
+}
+
+static void ath_opmode_init(struct ath_softc *sc)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ u32 rfilt, mfilt[2];
+
+ /* configure rx filter */
+ rfilt = ath_calcrxfilter(sc);
+ ath9k_hw_setrxfilter(ah, rfilt);
+
+ /* configure bssid mask */
+ if (ah->ah_caps.halBssIdMaskSupport)
+ ath9k_hw_setbssidmask(ah, sc->sc_bssidmask);
+
+ /* configure operational mode */
+ ath9k_hw_setopmode(ah);
+
+ /* Handle any link-level address change. */
+ ath9k_hw_setmac(ah, sc->sc_myaddr);
+
+ /* calculate and install multicast filter */
+ mfilt[0] = mfilt[1] = ~0;
+
+ ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
+ DPRINTF(sc, ATH_DBG_CONFIG ,
+ "%s: RX filter 0x%x, MC filter %08x:%08x\n",
+ __func__, rfilt, mfilt[0], mfilt[1]);
+}
+
+int ath_rx_init(struct ath_softc *sc, int nbufs)
+{
+ struct sk_buff *skb;
+ struct ath_buf *bf;
+ int error = 0;
+
+ do {
+ spin_lock_init(&sc->sc_rxflushlock);
+ sc->sc_rxflush = 0;
+ spin_lock_init(&sc->sc_rxbuflock);
+
+ /*
+ * Cisco's VPN software requires that drivers be able to
+ * receive encapsulated frames that are larger than the MTU.
+ * Since we can't be sure how large a frame we'll get, setup
+ * to handle the larges on possible.
+ */
+ sc->sc_rxbufsize = roundup(IEEE80211_MAX_MPDU_LEN,
+ min(sc->sc_cachelsz,
+ (u16)64));
+
+ DPRINTF(sc, ATH_DBG_CONFIG, "%s: cachelsz %u rxbufsize %u\n",
+ __func__, sc->sc_cachelsz, sc->sc_rxbufsize);
+
+ /* Initialize rx descriptors */
+
+ error = ath_descdma_setup(sc, &sc->sc_rxdma, &sc->sc_rxbuf,
+ "rx", nbufs, 1);
+ if (error != 0) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: failed to allocate rx descriptors: %d\n",
+ __func__, error);
+ break;
+ }
+
+ /* Pre-allocate a wbuf for each rx buffer */
+
+ list_for_each_entry(bf, &sc->sc_rxbuf, list) {
+ skb = ath_rxbuf_alloc(sc, sc->sc_rxbufsize);
+ if (skb == NULL) {
+ error = -ENOMEM;
+ break;
+ }
+
+ bf->bf_mpdu = skb;
+ bf->bf_buf_addr =
+ ath_skb_map_single(sc, skb, PCI_DMA_FROMDEVICE,
+ get_dma_mem_context(bf, bf_dmacontext));
+ ATH_RX_CONTEXT(skb)->ctx_rxbuf = bf;
+ }
+ sc->sc_rxlink = NULL;
+
+ } while (0);
+
+ if (error)
+ ath_rx_cleanup(sc);
+
+ return error;
+}
+
+/* Reclaim all rx queue resources */
+
+void ath_rx_cleanup(struct ath_softc *sc)
+{
+ struct sk_buff *skb;
+ struct ath_buf *bf;
+
+ list_for_each_entry(bf, &sc->sc_rxbuf, list) {
+ skb = bf->bf_mpdu;
+ if (skb)
+ dev_kfree_skb(skb);
+ }
+
+ /* cleanup rx descriptors */
+
+ if (sc->sc_rxdma.dd_desc_len != 0)
+ ath_descdma_cleanup(sc, &sc->sc_rxdma, &sc->sc_rxbuf);
+}
+
+/*
+ * Calculate the receive filter according to the
+ * operating mode and state:
+ *
+ * o always accept unicast, broadcast, and multicast traffic
+ * o maintain current state of phy error reception (the hal
+ * may enable phy error frames for noise immunity work)
+ * o probe request frames are accepted only when operating in
+ * hostap, adhoc, or monitor modes
+ * o enable promiscuous mode according to the interface state
+ * o accept beacons:
+ * - when operating in adhoc mode so the 802.11 layer creates
+ * node table entries for peers,
+ * - when operating in station mode for collecting rssi data when
+ * the station is otherwise quiet, or
+ * - when operating as a repeater so we see repeater-sta beacons
+ * - when scanning
+ */
+
+u32 ath_calcrxfilter(struct ath_softc *sc)
+{
+#define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
+ u32 rfilt;
+
+ rfilt = (ath9k_hw_getrxfilter(sc->sc_ah) & RX_FILTER_PRESERVE)
+ | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
+ | ATH9K_RX_FILTER_MCAST;
+
+ /* If not a STA, enable processing of Probe Requests */
+ if (sc->sc_opmode != ATH9K_M_STA)
+ rfilt |= ATH9K_RX_FILTER_PROBEREQ;
+
+ /* Can't set HOSTAP into promiscous mode */
+ if (sc->sc_opmode == ATH9K_M_MONITOR) {
+ rfilt |= ATH9K_RX_FILTER_PROM;
+ /* ??? To prevent from sending ACK */
+ rfilt &= ~ATH9K_RX_FILTER_UCAST;
+ }
+
+ if (sc->sc_opmode == ATH9K_M_STA || sc->sc_opmode == ATH9K_M_IBSS ||
+ sc->sc_scanning)
+ rfilt |= ATH9K_RX_FILTER_BEACON;
+
+ /* If in HOSTAP mode, want to enable reception of PSPOLL frames
+ & beacon frames */
+ if (sc->sc_opmode == ATH9K_M_HOSTAP)
+ rfilt |= (ATH9K_RX_FILTER_BEACON | ATH9K_RX_FILTER_PSPOLL);
+ return rfilt;
+#undef RX_FILTER_PRESERVE
+}
+
+/* Enable the receive h/w following a reset. */
+
+int ath_startrecv(struct ath_softc *sc)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ struct ath_buf *bf, *tbf;
+
+ spin_lock_bh(&sc->sc_rxbuflock);
+ if (list_empty(&sc->sc_rxbuf))
+ goto start_recv;
+
+ sc->sc_rxlink = NULL;
+ list_for_each_entry_safe(bf, tbf, &sc->sc_rxbuf, list) {
+ if (bf->bf_status & ATH_BUFSTATUS_STALE) {
+ /* restarting h/w, no need for holding descriptors */
+ bf->bf_status &= ~ATH_BUFSTATUS_STALE;
+ /*
+ * Upper layer may not be done with the frame yet so
+ * we can't just re-queue it to hardware. Remove it
+ * from h/w queue. It'll be re-queued when upper layer
+ * returns the frame and ath_rx_requeue_mpdu is called.
+ */
+ if (!(bf->bf_status & ATH_BUFSTATUS_FREE)) {
+ list_del(&bf->list);
+ continue;
+ }
+ }
+ /* chain descriptors */
+ ath_rx_buf_link(sc, bf);
+ }
+
+ /* We could have deleted elements so the list may be empty now */
+ if (list_empty(&sc->sc_rxbuf))
+ goto start_recv;
+
+ bf = list_first_entry(&sc->sc_rxbuf, struct ath_buf, list);
+ ath9k_hw_putrxbuf(ah, bf->bf_daddr);
+ ath9k_hw_rxena(ah); /* enable recv descriptors */
+
+start_recv:
+ spin_unlock_bh(&sc->sc_rxbuflock);
+ ath_opmode_init(sc); /* set filters, etc. */
+ ath9k_hw_startpcureceive(ah); /* re-enable PCU/DMA engine */
+ return 0;
+}
+
+/* Disable the receive h/w in preparation for a reset. */
+
+bool ath_stoprecv(struct ath_softc *sc)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ u64 tsf;
+ bool stopped;
+
+ ath9k_hw_stoppcurecv(ah); /* disable PCU */
+ ath9k_hw_setrxfilter(ah, 0); /* clear recv filter */
+ stopped = ath9k_hw_stopdmarecv(ah); /* disable DMA engine */
+ mdelay(3); /* 3ms is long enough for 1 frame */
+ tsf = ath9k_hw_gettsf64(ah);
+ sc->sc_rxlink = NULL; /* just in case */
+ return stopped;
+}
+
+/* Flush receive queue */
+
+void ath_flushrecv(struct ath_softc *sc)
+{
+ /*
+ * ath_rx_tasklet may be used to handle rx interrupt and flush receive
+ * queue at the same time. Use a lock to serialize the access of rx
+ * queue.
+ * ath_rx_tasklet cannot hold the spinlock while indicating packets.
+ * Instead, do not claim the spinlock but check for a flush in
+ * progress (see references to sc_rxflush)
+ */
+ spin_lock_bh(&sc->sc_rxflushlock);
+ sc->sc_rxflush = 1;
+
+ ath_rx_tasklet(sc, 1);
+
+ sc->sc_rxflush = 0;
+ spin_unlock_bh(&sc->sc_rxflushlock);
+}
+
+/* Process an individual frame */
+
+int ath_rx_input(struct ath_softc *sc,
+ struct ath_node *an,
+ int is_ampdu,
+ struct sk_buff *skb,
+ struct ath_recv_status *rx_status,
+ enum ATH_RX_TYPE *status)
+{
+ if (is_ampdu && sc->sc_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)
+{
+#define PA2DESC(_sc, _pa) \
+ ((struct ath_desc *)((caddr_t)(_sc)->sc_rxdma.dd_desc + \
+ ((_pa) - (_sc)->sc_rxdma.dd_desc_paddr)))
+
+ struct ath_buf *bf, *bf_held = NULL;
+ struct ath_desc *ds;
+ struct ieee80211_hdr *hdr;
+ struct sk_buff *skb = NULL;
+ struct ath_recv_status rx_status;
+ struct ath_hal *ah = sc->sc_ah;
+ int type, rx_processed = 0;
+ u32 phyerr;
+ u8 chainreset = 0;
+ int retval;
+ __le16 fc;
+
+ do {
+ /* If handling rx interrupt and flush is in progress => exit */
+ if (sc->sc_rxflush && (flush == 0))
+ break;
+
+ spin_lock_bh(&sc->sc_rxbuflock);
+ if (list_empty(&sc->sc_rxbuf)) {
+ sc->sc_rxlink = NULL;
+ spin_unlock_bh(&sc->sc_rxbuflock);
+ break;
+ }
+
+ bf = list_first_entry(&sc->sc_rxbuf, struct ath_buf, list);
+
+ /*
+ * There is a race condition that BH gets scheduled after sw
+ * writes RxE 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 (bf->bf_status & ATH_BUFSTATUS_STALE) {
+ bf_held = bf;
+ if (list_is_last(&bf_held->list, &sc->sc_rxbuf)) {
+ /*
+ * The holding descriptor is the last
+ * descriptor in queue. It's safe to
+ * remove the last holding descriptor
+ * in BH context.
+ */
+ list_del(&bf_held->list);
+ bf_held->bf_status &= ~ATH_BUFSTATUS_STALE;
+ sc->sc_rxlink = NULL;
+
+ if (bf_held->bf_status & ATH_BUFSTATUS_FREE) {
+ list_add_tail(&bf_held->list,
+ &sc->sc_rxbuf);
+ ath_rx_buf_link(sc, bf_held);
+ }
+ spin_unlock_bh(&sc->sc_rxbuflock);
+ break;
+ }
+ bf = list_entry(bf->list.next, struct ath_buf, list);
+ }
+
+ ds = bf->bf_desc;
+ ++rx_processed;
+
+ /*
+ * Must provide the virtual address of the current
+ * descriptor, the physical address, and the virtual
+ * address of the next descriptor in the h/w chain.
+ * This allows the HAL to look ahead to see if the
+ * hardware is done with a descriptor by checking the
+ * done bit in the following descriptor and the address
+ * of the current descriptor the DMA engine is working
+ * on. All this is necessary because of our use of
+ * a self-linked list to avoid rx overruns.
+ */
+ retval = ath9k_hw_rxprocdesc(ah,
+ ds,
+ bf->bf_daddr,
+ PA2DESC(sc, ds->ds_link),
+ 0);
+ if (retval == -EINPROGRESS) {
+ struct ath_buf *tbf;
+ struct ath_desc *tds;
+
+ if (list_is_last(&bf->list, &sc->sc_rxbuf)) {
+ spin_unlock_bh(&sc->sc_rxbuflock);
+ break;
+ }
+
+ tbf = list_entry(bf->list.next, struct ath_buf, list);
+
+ /*
+ * On some hardware the descriptor status words could
+ * get corrupted, including the done bit. Because of
+ * this, check if the next descriptor's done bit is
+ * set or not.
+ *
+ * If the next descriptor's done bit is set, the current
+ * descriptor has been corrupted. Force s/w to discard
+ * this descriptor and continue...
+ */
+
+ tds = tbf->bf_desc;
+ retval = ath9k_hw_rxprocdesc(ah,
+ tds, tbf->bf_daddr,
+ PA2DESC(sc, tds->ds_link), 0);
+ if (retval == -EINPROGRESS) {
+ spin_unlock_bh(&sc->sc_rxbuflock);
+ break;
+ }
+ }
+
+ /* XXX: we do not support frames spanning
+ * multiple descriptors */
+ bf->bf_status |= ATH_BUFSTATUS_DONE;
+
+ skb = bf->bf_mpdu;
+ if (skb == NULL) { /* XXX ??? can this happen */
+ spin_unlock_bh(&sc->sc_rxbuflock);
+ continue;
+ }
+ /*
+ * Now we know it's a completed frame, we can indicate the
+ * frame. Remove the previous holding descriptor and leave
+ * this one in the queue as the new holding descriptor.
+ */
+ if (bf_held) {
+ list_del(&bf_held->list);
+ bf_held->bf_status &= ~ATH_BUFSTATUS_STALE;
+ if (bf_held->bf_status & ATH_BUFSTATUS_FREE) {
+ list_add_tail(&bf_held->list, &sc->sc_rxbuf);
+ /* try to requeue this descriptor */
+ ath_rx_buf_link(sc, bf_held);
+ }
+ }
+
+ bf->bf_status |= ATH_BUFSTATUS_STALE;
+ bf_held = bf;
+ /*
+ * Release the lock here in case ieee80211_input() return
+ * the frame immediately by calling ath_rx_mpdu_requeue().
+ */
+ spin_unlock_bh(&sc->sc_rxbuflock);
+
+ if (flush) {
+ /*
+ * If we're asked to flush receive queue, directly
+ * chain it back at the queue without processing it.
+ */
+ goto rx_next;
+ }
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ fc = hdr->frame_control;
+ memzero(&rx_status, sizeof(struct ath_recv_status));
+
+ if (ds->ds_rxstat.rs_more) {
+ /*
+ * Frame spans multiple descriptors; this
+ * cannot happen yet as we don't support
+ * jumbograms. If not in monitor mode,
+ * discard the frame.
+ */
+#ifndef ERROR_FRAMES
+ /*
+ * Enable this if you want to see
+ * error frames in Monitor mode.
+ */
+ if (sc->sc_opmode != ATH9K_M_MONITOR)
+ goto rx_next;
+#endif
+ /* fall thru for monitor mode handling... */
+ } else if (ds->ds_rxstat.rs_status != 0) {
+ if (ds->ds_rxstat.rs_status & ATH9K_RXERR_CRC)
+ rx_status.flags |= ATH_RX_FCS_ERROR;
+ if (ds->ds_rxstat.rs_status & ATH9K_RXERR_PHY) {
+ phyerr = ds->ds_rxstat.rs_phyerr & 0x1f;
+ goto rx_next;
+ }
+
+ if (ds->ds_rxstat.rs_status & ATH9K_RXERR_DECRYPT) {
+ /*
+ * Decrypt error. We only mark packet status
+ * here and always push up the frame up to let
+ * mac80211 handle the actual error case, be
+ * it no decryption key or real decryption
+ * error. This let us keep statistics there.
+ */
+ rx_status.flags |= ATH_RX_DECRYPT_ERROR;
+ } else if (ds->ds_rxstat.rs_status & ATH9K_RXERR_MIC) {
+ /*
+ * Demic error. We only mark frame status here
+ * and always push up the frame up to let
+ * mac80211 handle the actual error case. This
+ * let us keep statistics there. Hardware may
+ * post a false-positive MIC error.
+ */
+ if (ieee80211_is_ctl(fc))
+ /*
+ * Sometimes, we get invalid
+ * MIC failures on valid control frames.
+ * Remove these mic errors.
+ */
+ ds->ds_rxstat.rs_status &=
+ ~ATH9K_RXERR_MIC;
+ else
+ rx_status.flags |= ATH_RX_MIC_ERROR;
+ }
+ /*
+ * Reject error frames with the exception of
+ * decryption and MIC failures. For monitor mode,
+ * we also ignore the CRC error.
+ */
+ if (sc->sc_opmode == ATH9K_M_MONITOR) {
+ if (ds->ds_rxstat.rs_status &
+ ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
+ ATH9K_RXERR_CRC))
+ goto rx_next;
+ } else {
+ if (ds->ds_rxstat.rs_status &
+ ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
+ goto rx_next;
+ }
+ }
+ }
+ /*
+ * The status portion of the descriptor could get corrupted.
+ */
+ if (sc->sc_rxbufsize < ds->ds_rxstat.rs_datalen)
+ goto rx_next;
+ /*
+ * Sync and unmap the frame. At this point we're
+ * committed to passing the sk_buff somewhere so
+ * clear buf_skb; this means a new sk_buff must be
+ * allocated when the rx descriptor is setup again
+ * to receive another frame.
+ */
+ skb_put(skb, ds->ds_rxstat.rs_datalen);
+ skb->protocol = cpu_to_be16(ETH_P_CONTROL);
+ rx_status.tsf = ath_extend_tsf(sc, ds->ds_rxstat.rs_tstamp);
+ rx_status.rateieee =
+ sc->sc_hwmap[ds->ds_rxstat.rs_rate].ieeerate;
+ rx_status.rateKbps =
+ sc->sc_hwmap[ds->ds_rxstat.rs_rate].rateKbps;
+ rx_status.ratecode = ds->ds_rxstat.rs_rate;
+
+ /* HT rate */
+ if (rx_status.ratecode & 0x80) {
+ /* TODO - add table to avoid division */
+ if (ds->ds_rxstat.rs_flags & ATH9K_RX_2040) {
+ rx_status.flags |= ATH_RX_40MHZ;
+ rx_status.rateKbps =
+ (rx_status.rateKbps * 27) / 13;
+ }
+ if (ds->ds_rxstat.rs_flags & ATH9K_RX_GI)
+ rx_status.rateKbps =
+ (rx_status.rateKbps * 10) / 9;
+ else
+ rx_status.flags |= ATH_RX_SHORT_GI;
+ }
+
+ /* sc->sc_noise_floor is only available when the station
+ attaches to an AP, so we use a default value
+ if we are not yet attached. */
+
+ /* XXX we should use either sc->sc_noise_floor or
+ * ath_hal_getChanNoise(ah, &sc->sc_curchan)
+ * to calculate the noise floor.
+ * However, the value returned by ath_hal_getChanNoise
+ * seems to be incorrect (-31dBm on the last test),
+ * so we will use a hard-coded value until we
+ * figure out what is going on.
+ */
+ rx_status.abs_rssi =
+ ds->ds_rxstat.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
+
+ pci_dma_sync_single_for_cpu(sc->pdev,
+ bf->bf_buf_addr,
+ skb_tailroom(skb),
+ PCI_DMA_FROMDEVICE);
+ pci_unmap_single(sc->pdev,
+ bf->bf_buf_addr,
+ sc->sc_rxbufsize,
+ PCI_DMA_FROMDEVICE);
+
+ /* XXX: Ah! make me more readable, use a helper */
+ if (ah->ah_caps.halHTSupport) {
+ if (ds->ds_rxstat.rs_moreaggr == 0) {
+ rx_status.rssictl[0] =
+ ds->ds_rxstat.rs_rssi_ctl0;
+ rx_status.rssictl[1] =
+ ds->ds_rxstat.rs_rssi_ctl1;
+ rx_status.rssictl[2] =
+ ds->ds_rxstat.rs_rssi_ctl2;
+ rx_status.rssi = ds->ds_rxstat.rs_rssi;
+ if (ds->ds_rxstat.rs_flags & ATH9K_RX_2040) {
+ rx_status.rssiextn[0] =
+ ds->ds_rxstat.rs_rssi_ext0;
+ rx_status.rssiextn[1] =
+ ds->ds_rxstat.rs_rssi_ext1;
+ rx_status.rssiextn[2] =
+ ds->ds_rxstat.rs_rssi_ext2;
+ rx_status.flags |=
+ ATH_RX_RSSI_EXTN_VALID;
+ }
+ rx_status.flags |= ATH_RX_RSSI_VALID |
+ ATH_RX_CHAIN_RSSI_VALID;
+ }
+ } else {
+ /*
+ * Need to insert the "combined" rssi into the
+ * status structure for upper layer processing
+ */
+ rx_status.rssi = ds->ds_rxstat.rs_rssi;
+ rx_status.flags |= ATH_RX_RSSI_VALID;
+ }
+
+ /* Pass frames up to the stack. */
+
+ type = ath_rx_indicate(sc, skb,
+ &rx_status, ds->ds_rxstat.rs_keyix);
+
+ /*
+ * change the default rx antenna if rx diversity chooses the
+ * other antenna 3 times in a row.
+ */
+ if (sc->sc_defant != ds->ds_rxstat.rs_antenna) {
+ if (++sc->sc_rxotherant >= 3)
+ ath_setdefantenna(sc,
+ ds->ds_rxstat.rs_antenna);
+ } else {
+ sc->sc_rxotherant = 0;
+ }
+
+#ifdef CONFIG_SLOW_ANT_DIV
+ if ((rx_status.flags & ATH_RX_RSSI_VALID) &&
+ ieee80211_is_beacon(fc)) {
+ ath_slow_ant_div(&sc->sc_antdiv, hdr, &ds->ds_rxstat);
+ }
+#endif
+ /*
+ * For frames successfully indicated, the buffer will be
+ * returned to us by upper layers by calling
+ * ath_rx_mpdu_requeue, either synchronusly or asynchronously.
+ * So we don't want to do it here in this loop.
+ */
+ continue;
+
+rx_next:
+ bf->bf_status |= ATH_BUFSTATUS_FREE;
+ } while (TRUE);
+
+ if (chainreset) {
+ DPRINTF(sc, ATH_DBG_CONFIG,
+ "%s: Reset rx chain mask. "
+ "Do internal reset\n", __func__);
+ ASSERT(flush == 0);
+ ath_internal_reset(sc);
+ }
+
+ return 0;
+#undef PA2DESC
+}
+
+/* Process ADDBA request in per-TID data structure */
+
+int ath_rx_aggr_start(struct ath_softc *sc,
+ const u8 *addr,
+ 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;
+
+ spin_lock_bh(&sc->node_lock);
+ an = ath_node_find(sc, (u8 *) addr);
+ spin_unlock_bh(&sc->node_lock);
+
+ if (!an) {
+ DPRINTF(sc, ATH_DBG_AGGR,
+ "%s: Node not found to initialize RX aggregation\n",
+ __func__);
+ return -1;
+ }
+
+ sband = hw->wiphy->bands[hw->conf.channel->band];
+ buffersize = IEEE80211_MIN_AMPDU_BUF <<
+ sband->ht_info.ampdu_factor; /* FIXME */
+
+ rxtid = &an->an_aggr.rx.tid[tid];
+
+ spin_lock_bh(&rxtid->tidlock);
+ if (sc->sc_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) */
+ memzero(rxtid->rxbuf, 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,
+ const u8 *addr,
+ u16 tid)
+{
+ struct ath_node *an;
+
+ spin_lock_bh(&sc->node_lock);
+ an = ath_node_find(sc, (u8 *) addr);
+ spin_unlock_bh(&sc->node_lock);
+
+ if (!an) {
+ DPRINTF(sc, ATH_DBG_AGGR,
+ "%s: RX aggr stop for non-existent node\n", __func__);
+ return -1;
+ }
+
+ 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)
+{
+ if (sc->sc_rxaggr) {
+ 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)
+{
+ if (sc->sc_rxaggr) {
+ 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;
+ }
+ }
+
+}
+
+/* Cleanup per-node receive state */
+
+void ath_rx_node_free(struct ath_softc *sc, struct ath_node *an)
+{
+ ath_rx_node_cleanup(sc, an);
+}
+
+dma_addr_t ath_skb_map_single(struct ath_softc *sc,
+ struct sk_buff *skb,
+ int direction,
+ dma_addr_t *pa)
+{
+ /*
+ * NB: do NOT use skb->len, which is 0 on initialization.
+ * Use skb's entire data area instead.
+ */
+ *pa = pci_map_single(sc->pdev, skb->data,
+ skb_end_pointer(skb) - skb->head, direction);
+ return *pa;
+}
+
+void ath_skb_unmap_single(struct ath_softc *sc,
+ struct sk_buff *skb,
+ int direction,
+ dma_addr_t *pa)
+{
+ /* Unmap skb's entire data area */
+ pci_unmap_single(sc->pdev, *pa,
+ skb_end_pointer(skb) - skb->head, direction);
+}