#define SKB_CB_ATHBUF(__skb) (*((struct ath_buf **)__skb->cb))
+static inline bool ath9k_check_auto_sleep(struct ath_softc *sc)
+{
+ return sc->ps_enabled &&
+ (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP);
+}
+
static struct ieee80211_hw * ath_get_virt_hw(struct ath_softc *sc,
struct ieee80211_hdr *hdr)
{
hdr = (struct ieee80211_hdr *)skb->data;
/* Process Beacon and CAB receive in PS state */
- if ((sc->ps_flags & PS_WAIT_FOR_BEACON) &&
- ieee80211_is_beacon(hdr->frame_control))
+ if (((sc->ps_flags & PS_WAIT_FOR_BEACON) || ath9k_check_auto_sleep(sc))
+ && ieee80211_is_beacon(hdr->frame_control))
ath_rx_ps_beacon(sc, skb);
else if ((sc->ps_flags & PS_WAIT_FOR_CAB) &&
(ieee80211_is_data(hdr->frame_control) ||
return bf;
}
+/* Assumes you've already done the endian to CPU conversion */
+static bool ath9k_rx_accept(struct ath_common *common,
+ struct ieee80211_hdr *hdr,
+ struct ieee80211_rx_status *rxs,
+ struct ath_rx_status *rx_stats,
+ bool *decrypt_error)
+{
+ struct ath_hw *ah = common->ah;
+ __le16 fc;
+ u8 rx_status_len = ah->caps.rx_status_len;
+
+ fc = hdr->frame_control;
+
+ if (!rx_stats->rs_datalen)
+ return false;
+ /*
+ * rs_status follows rs_datalen so if rs_datalen is too large
+ * we can take a hint that hardware corrupted it, so ignore
+ * those frames.
+ */
+ if (rx_stats->rs_datalen > (common->rx_bufsize - rx_status_len))
+ return false;
+
+ /*
+ * rs_more indicates chained descriptors which can be used
+ * to link buffers together for a sort of scatter-gather
+ * operation.
+ * reject the frame, we don't support scatter-gather yet and
+ * the frame is probably corrupt anyway
+ */
+ if (rx_stats->rs_more)
+ return false;
+
+ /*
+ * The rx_stats->rs_status will not be set until the end of the
+ * chained descriptors so it can be ignored if rs_more is set. The
+ * rs_more will be false at the last element of the chained
+ * descriptors.
+ */
+ if (rx_stats->rs_status != 0) {
+ if (rx_stats->rs_status & ATH9K_RXERR_CRC)
+ rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
+ if (rx_stats->rs_status & ATH9K_RXERR_PHY)
+ return false;
+
+ if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
+ *decrypt_error = true;
+ } else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
+ if (ieee80211_is_ctl(fc))
+ /*
+ * Sometimes, we get invalid
+ * MIC failures on valid control frames.
+ * Remove these mic errors.
+ */
+ rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
+ else
+ rxs->flag |= RX_FLAG_MMIC_ERROR;
+ }
+ /*
+ * Reject error frames with the exception of
+ * decryption and MIC failures. For monitor mode,
+ * we also ignore the CRC error.
+ */
+ if (ah->opmode == NL80211_IFTYPE_MONITOR) {
+ if (rx_stats->rs_status &
+ ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
+ ATH9K_RXERR_CRC))
+ return false;
+ } else {
+ if (rx_stats->rs_status &
+ ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+static int ath9k_process_rate(struct ath_common *common,
+ struct ieee80211_hw *hw,
+ struct ath_rx_status *rx_stats,
+ struct ieee80211_rx_status *rxs)
+{
+ struct ieee80211_supported_band *sband;
+ enum ieee80211_band band;
+ unsigned int i = 0;
+
+ band = hw->conf.channel->band;
+ sband = hw->wiphy->bands[band];
+
+ if (rx_stats->rs_rate & 0x80) {
+ /* HT rate */
+ rxs->flag |= RX_FLAG_HT;
+ if (rx_stats->rs_flags & ATH9K_RX_2040)
+ rxs->flag |= RX_FLAG_40MHZ;
+ if (rx_stats->rs_flags & ATH9K_RX_GI)
+ rxs->flag |= RX_FLAG_SHORT_GI;
+ rxs->rate_idx = rx_stats->rs_rate & 0x7f;
+ return 0;
+ }
+
+ for (i = 0; i < sband->n_bitrates; i++) {
+ if (sband->bitrates[i].hw_value == rx_stats->rs_rate) {
+ rxs->rate_idx = i;
+ return 0;
+ }
+ if (sband->bitrates[i].hw_value_short == rx_stats->rs_rate) {
+ rxs->flag |= RX_FLAG_SHORTPRE;
+ rxs->rate_idx = i;
+ return 0;
+ }
+ }
+
+ /*
+ * No valid hardware bitrate found -- we should not get here
+ * because hardware has already validated this frame as OK.
+ */
+ ath_print(common, ATH_DBG_XMIT, "unsupported hw bitrate detected "
+ "0x%02x using 1 Mbit\n", rx_stats->rs_rate);
+
+ return -EINVAL;
+}
+
+static void ath9k_process_rssi(struct ath_common *common,
+ struct ieee80211_hw *hw,
+ struct ieee80211_hdr *hdr,
+ struct ath_rx_status *rx_stats)
+{
+ struct ath_hw *ah = common->ah;
+ struct ieee80211_sta *sta;
+ struct ath_node *an;
+ int last_rssi = ATH_RSSI_DUMMY_MARKER;
+ __le16 fc;
+
+ fc = hdr->frame_control;
+
+ rcu_read_lock();
+ /*
+ * XXX: use ieee80211_find_sta! This requires quite a bit of work
+ * under the current ath9k virtual wiphy implementation as we have
+ * no way of tying a vif to wiphy. Typically vifs are attached to
+ * at least one sdata of a wiphy on mac80211 but with ath9k virtual
+ * wiphy you'd have to iterate over every wiphy and each sdata.
+ */
+ sta = ieee80211_find_sta_by_hw(hw, hdr->addr2);
+ if (sta) {
+ an = (struct ath_node *) sta->drv_priv;
+ if (rx_stats->rs_rssi != ATH9K_RSSI_BAD &&
+ !rx_stats->rs_moreaggr)
+ ATH_RSSI_LPF(an->last_rssi, rx_stats->rs_rssi);
+ last_rssi = an->last_rssi;
+ }
+ rcu_read_unlock();
+
+ if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
+ rx_stats->rs_rssi = ATH_EP_RND(last_rssi,
+ ATH_RSSI_EP_MULTIPLIER);
+ if (rx_stats->rs_rssi < 0)
+ rx_stats->rs_rssi = 0;
+
+ /* Update Beacon RSSI, this is used by ANI. */
+ if (ieee80211_is_beacon(fc))
+ ah->stats.avgbrssi = rx_stats->rs_rssi;
+}
+
+/*
+ * For Decrypt or Demic errors, 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.
+ */
+static int ath9k_rx_skb_preprocess(struct ath_common *common,
+ struct ieee80211_hw *hw,
+ struct ieee80211_hdr *hdr,
+ struct ath_rx_status *rx_stats,
+ struct ieee80211_rx_status *rx_status,
+ bool *decrypt_error)
+{
+ struct ath_hw *ah = common->ah;
+
+ memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
+
+ /*
+ * everything but the rate is checked here, the rate check is done
+ * separately to avoid doing two lookups for a rate for each frame.
+ */
+ if (!ath9k_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error))
+ return -EINVAL;
+
+ ath9k_process_rssi(common, hw, hdr, rx_stats);
+
+ if (ath9k_process_rate(common, hw, rx_stats, rx_status))
+ return -EINVAL;
+
+ rx_status->mactime = ath9k_hw_extend_tsf(ah, rx_stats->rs_tstamp);
+ rx_status->band = hw->conf.channel->band;
+ rx_status->freq = hw->conf.channel->center_freq;
+ rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
+ rx_status->antenna = rx_stats->rs_antenna;
+ rx_status->flag |= RX_FLAG_TSFT;
+
+ return 0;
+}
+
+static void ath9k_rx_skb_postprocess(struct ath_common *common,
+ struct sk_buff *skb,
+ struct ath_rx_status *rx_stats,
+ struct ieee80211_rx_status *rxs,
+ bool decrypt_error)
+{
+ struct ath_hw *ah = common->ah;
+ struct ieee80211_hdr *hdr;
+ int hdrlen, padpos, padsize;
+ u8 keyix;
+ __le16 fc;
+
+ /* see if any padding is done by the hw and remove it */
+ hdr = (struct ieee80211_hdr *) skb->data;
+ hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+ fc = hdr->frame_control;
+ padpos = ath9k_cmn_padpos(hdr->frame_control);
+
+ /* The MAC header is padded to have 32-bit boundary if the
+ * packet payload is non-zero. The general calculation for
+ * padsize would take into account odd header lengths:
+ * padsize = (4 - padpos % 4) % 4; However, since only
+ * even-length headers are used, padding can only be 0 or 2
+ * bytes and we can optimize this a bit. In addition, we must
+ * not try to remove padding from short control frames that do
+ * not have payload. */
+ padsize = padpos & 3;
+ if (padsize && skb->len>=padpos+padsize+FCS_LEN) {
+ memmove(skb->data + padsize, skb->data, padpos);
+ skb_pull(skb, padsize);
+ }
+
+ keyix = rx_stats->rs_keyix;
+
+ if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error &&
+ ieee80211_has_protected(fc)) {
+ rxs->flag |= RX_FLAG_DECRYPTED;
+ } else if (ieee80211_has_protected(fc)
+ && !decrypt_error && skb->len >= hdrlen + 4) {
+ keyix = skb->data[hdrlen + 3] >> 6;
+
+ if (test_bit(keyix, common->keymap))
+ rxs->flag |= RX_FLAG_DECRYPTED;
+ }
+ if (ah->sw_mgmt_crypto &&
+ (rxs->flag & RX_FLAG_DECRYPTED) &&
+ ieee80211_is_mgmt(fc))
+ /* Use software decrypt for management frames. */
+ rxs->flag &= ~RX_FLAG_DECRYPTED;
+}
int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
{
enum ath9k_rx_qtype qtype;
bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
int dma_type;
+ u8 rx_status_len = ah->caps.rx_status_len;
if (edma)
- dma_type = DMA_FROM_DEVICE;
- else
dma_type = DMA_BIDIRECTIONAL;
+ else
+ dma_type = DMA_FROM_DEVICE;
qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP;
spin_lock_bh(&sc->rx.rxbuflock);
if (!skb)
continue;
- hdr = (struct ieee80211_hdr *) skb->data;
+ hdr = (struct ieee80211_hdr *) (skb->data + rx_status_len);
rxs = IEEE80211_SKB_RXCB(skb);
hw = ath_get_virt_hw(sc, hdr);
if (flush)
goto requeue;
- retval = ath9k_cmn_rx_skb_preprocess(common, hw, skb, &rs,
- rxs, &decrypt_error);
+ retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
+ rxs, &decrypt_error);
if (retval)
goto requeue;
if (ah->caps.rx_status_len)
skb_pull(skb, ah->caps.rx_status_len);
- ath9k_cmn_rx_skb_postprocess(common, skb, &rs,
- rxs, decrypt_error);
+ ath9k_rx_skb_postprocess(common, skb, &rs,
+ rxs, decrypt_error);
/* We will now give hardware our shiny new allocated skb */
bf->bf_mpdu = requeue_skb;
sc->rx.rxotherant = 0;
}
- if (unlikely(sc->ps_flags & (PS_WAIT_FOR_BEACON |
- PS_WAIT_FOR_CAB |
- PS_WAIT_FOR_PSPOLL_DATA)))
+ if (unlikely(ath9k_check_auto_sleep(sc) ||
+ (sc->ps_flags & (PS_WAIT_FOR_BEACON |
+ PS_WAIT_FOR_CAB |
+ PS_WAIT_FOR_PSPOLL_DATA))))
ath_rx_ps(sc, skb);
ath_rx_send_to_mac80211(hw, sc, skb, rxs);
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