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path: root/drivers/net/wireless/ath/ath9k/recv.c
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Diffstat (limited to 'drivers/net/wireless/ath/ath9k/recv.c')
-rw-r--r--drivers/net/wireless/ath/ath9k/recv.c313
1 files changed, 51 insertions, 262 deletions
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 355dd1834e1d..477365e5ae69 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -48,6 +48,7 @@ static struct ieee80211_hw * ath_get_virt_hw(struct ath_softc *sc,
static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
{
struct ath_hw *ah = sc->sc_ah;
+ struct ath_common *common = ath9k_hw_common(ah);
struct ath_desc *ds;
struct sk_buff *skb;
@@ -62,11 +63,13 @@ static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
BUG_ON(skb == NULL);
ds->ds_vdata = skb->data;
- /* setup rx descriptors. The rx.bufsize here tells the harware
+ /*
+ * setup rx descriptors. The rx_bufsize here tells the hardware
* how much data it can DMA to us and that we are prepared
- * to process */
+ * to process
+ */
ath9k_hw_setuprxdesc(ah, ds,
- sc->rx.bufsize,
+ common->rx_bufsize,
0);
if (sc->rx.rxlink == NULL)
@@ -86,190 +89,6 @@ static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
sc->rx.rxotherant = 0;
}
-/*
- * Extend 15-bit time stamp from rx descriptor to
- * a full 64-bit TSF using the current h/w TSF.
-*/
-static u64 ath_extend_tsf(struct ath_softc *sc, u32 rstamp)
-{
- u64 tsf;
-
- tsf = ath9k_hw_gettsf64(sc->sc_ah);
- if ((tsf & 0x7fff) < rstamp)
- tsf -= 0x8000;
- return (tsf & ~0x7fff) | rstamp;
-}
-
-/*
- * 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 ath_rx_prepare(struct sk_buff *skb, struct ath_desc *ds,
- struct ieee80211_rx_status *rx_status, bool *decrypt_error,
- struct ath_softc *sc)
-{
- struct ieee80211_hdr *hdr;
- u8 ratecode;
- __le16 fc;
- struct ieee80211_hw *hw;
- struct ieee80211_sta *sta;
- struct ath_node *an;
- int last_rssi = ATH_RSSI_DUMMY_MARKER;
-
-
- hdr = (struct ieee80211_hdr *)skb->data;
- fc = hdr->frame_control;
- memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
- hw = ath_get_virt_hw(sc, hdr);
-
- 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. Enable this if you want to see
- * error frames in Monitor mode.
- */
- if (sc->sc_ah->opmode != NL80211_IFTYPE_MONITOR)
- goto rx_next;
- } else if (ds->ds_rxstat.rs_status != 0) {
- if (ds->ds_rxstat.rs_status & ATH9K_RXERR_CRC)
- rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
- if (ds->ds_rxstat.rs_status & ATH9K_RXERR_PHY)
- goto rx_next;
-
- if (ds->ds_rxstat.rs_status & ATH9K_RXERR_DECRYPT) {
- *decrypt_error = true;
- } else if (ds->ds_rxstat.rs_status & ATH9K_RXERR_MIC) {
- 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->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 (sc->sc_ah->opmode == NL80211_IFTYPE_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;
- }
- }
- }
-
- ratecode = ds->ds_rxstat.rs_rate;
-
- if (ratecode & 0x80) {
- /* HT rate */
- rx_status->flag |= RX_FLAG_HT;
- if (ds->ds_rxstat.rs_flags & ATH9K_RX_2040)
- rx_status->flag |= RX_FLAG_40MHZ;
- if (ds->ds_rxstat.rs_flags & ATH9K_RX_GI)
- rx_status->flag |= RX_FLAG_SHORT_GI;
- rx_status->rate_idx = ratecode & 0x7f;
- } else {
- int i = 0, cur_band, n_rates;
-
- cur_band = hw->conf.channel->band;
- n_rates = sc->sbands[cur_band].n_bitrates;
-
- for (i = 0; i < n_rates; i++) {
- if (sc->sbands[cur_band].bitrates[i].hw_value ==
- ratecode) {
- rx_status->rate_idx = i;
- break;
- }
-
- if (sc->sbands[cur_band].bitrates[i].hw_value_short ==
- ratecode) {
- rx_status->rate_idx = i;
- rx_status->flag |= RX_FLAG_SHORTPRE;
- break;
- }
- }
- }
-
- rcu_read_lock();
- /* XXX: use ieee80211_find_sta! */
- sta = ieee80211_find_sta_by_hw(sc->hw, hdr->addr2);
- if (sta) {
- an = (struct ath_node *) sta->drv_priv;
- if (ds->ds_rxstat.rs_rssi != ATH9K_RSSI_BAD &&
- !ds->ds_rxstat.rs_moreaggr)
- ATH_RSSI_LPF(an->last_rssi, ds->ds_rxstat.rs_rssi);
- last_rssi = an->last_rssi;
- }
- rcu_read_unlock();
-
- if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
- ds->ds_rxstat.rs_rssi = ATH_EP_RND(last_rssi,
- ATH_RSSI_EP_MULTIPLIER);
- if (ds->ds_rxstat.rs_rssi < 0)
- ds->ds_rxstat.rs_rssi = 0;
- else if (ds->ds_rxstat.rs_rssi > 127)
- ds->ds_rxstat.rs_rssi = 127;
-
- /* Update Beacon RSSI, this is used by ANI. */
- if (ieee80211_is_beacon(fc))
- sc->sc_ah->stats.avgbrssi = ds->ds_rxstat.rs_rssi;
-
- rx_status->mactime = ath_extend_tsf(sc, ds->ds_rxstat.rs_tstamp);
- rx_status->band = hw->conf.channel->band;
- rx_status->freq = hw->conf.channel->center_freq;
- rx_status->noise = sc->ani.noise_floor;
- rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + ds->ds_rxstat.rs_rssi;
- rx_status->antenna = ds->ds_rxstat.rs_antenna;
-
- /*
- * Theory for reporting quality:
- *
- * At a hardware RSSI of 45 you will be able to use MCS 7 reliably.
- * At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
- * At a hardware RSSI of 35 you should be able use 54 Mbps reliably.
- *
- * MCS 7 is the highets MCS index usable by a 1-stream device.
- * MCS 15 is the highest MCS index usable by a 2-stream device.
- *
- * All ath9k devices are either 1-stream or 2-stream.
- *
- * How many bars you see is derived from the qual reporting.
- *
- * A more elaborate scheme can be used here but it requires tables
- * of SNR/throughput for each possible mode used. For the MCS table
- * you can refer to the wireless wiki:
- *
- * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
- *
- */
- if (conf_is_ht(&hw->conf))
- rx_status->qual = ds->ds_rxstat.rs_rssi * 100 / 45;
- else
- rx_status->qual = ds->ds_rxstat.rs_rssi * 100 / 35;
-
- /* rssi can be more than 45 though, anything above that
- * should be considered at 100% */
- if (rx_status->qual > 100)
- rx_status->qual = 100;
-
- rx_status->flag |= RX_FLAG_TSFT;
-
- return 1;
-rx_next:
- return 0;
-}
-
static void ath_opmode_init(struct ath_softc *sc)
{
struct ath_hw *ah = sc->sc_ah;
@@ -307,11 +126,11 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
sc->sc_flags &= ~SC_OP_RXFLUSH;
spin_lock_init(&sc->rx.rxbuflock);
- sc->rx.bufsize = roundup(IEEE80211_MAX_MPDU_LEN,
- min(common->cachelsz, (u16)64));
+ common->rx_bufsize = roundup(IEEE80211_MAX_MPDU_LEN,
+ min(common->cachelsz, (u16)64));
ath_print(common, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n",
- common->cachelsz, sc->rx.bufsize);
+ common->cachelsz, common->rx_bufsize);
/* Initialize rx descriptors */
@@ -324,7 +143,7 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
}
list_for_each_entry(bf, &sc->rx.rxbuf, list) {
- skb = ath_rxbuf_alloc(common, sc->rx.bufsize, GFP_KERNEL);
+ skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_KERNEL);
if (skb == NULL) {
error = -ENOMEM;
goto err;
@@ -332,7 +151,7 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
bf->bf_mpdu = skb;
bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
- sc->rx.bufsize,
+ common->rx_bufsize,
DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(sc->dev,
bf->bf_buf_addr))) {
@@ -356,6 +175,8 @@ err:
void ath_rx_cleanup(struct ath_softc *sc)
{
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath_common *common = ath9k_hw_common(ah);
struct sk_buff *skb;
struct ath_buf *bf;
@@ -363,7 +184,7 @@ void ath_rx_cleanup(struct ath_softc *sc)
skb = bf->bf_mpdu;
if (skb) {
dma_unmap_single(sc->dev, bf->bf_buf_addr,
- sc->rx.bufsize, DMA_FROM_DEVICE);
+ common->rx_bufsize, DMA_FROM_DEVICE);
dev_kfree_skb(skb);
}
}
@@ -616,8 +437,9 @@ static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb)
}
}
-static void ath_rx_send_to_mac80211(struct ath_softc *sc, struct sk_buff *skb,
- struct ieee80211_rx_status *rx_status)
+static void ath_rx_send_to_mac80211(struct ieee80211_hw *hw,
+ struct ath_softc *sc, struct sk_buff *skb,
+ struct ieee80211_rx_status *rxs)
{
struct ieee80211_hdr *hdr;
@@ -637,19 +459,14 @@ static void ath_rx_send_to_mac80211(struct ath_softc *sc, struct sk_buff *skb,
if (aphy == NULL)
continue;
nskb = skb_copy(skb, GFP_ATOMIC);
- if (nskb) {
- memcpy(IEEE80211_SKB_RXCB(nskb), rx_status,
- sizeof(*rx_status));
- ieee80211_rx(aphy->hw, nskb);
- }
+ if (!nskb)
+ continue;
+ ieee80211_rx(aphy->hw, nskb);
}
- memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
ieee80211_rx(sc->hw, skb);
- } else {
+ } else
/* Deliver unicast frames based on receiver address */
- memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
- ieee80211_rx(ath_get_virt_hw(sc, hdr), skb);
- }
+ ieee80211_rx(hw, skb);
}
int ath_rx_tasklet(struct ath_softc *sc, int flush)
@@ -660,15 +477,20 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
struct ath_buf *bf;
struct ath_desc *ds;
+ struct ath_rx_status *rx_stats;
struct sk_buff *skb = NULL, *requeue_skb;
- struct ieee80211_rx_status rx_status;
+ struct ieee80211_rx_status *rxs;
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
+ /*
+ * The hw can techncically differ from common->hw when using ath9k
+ * virtual wiphy so to account for that we iterate over the active
+ * wiphys and find the appropriate wiphy and therefore hw.
+ */
+ struct ieee80211_hw *hw = NULL;
struct ieee80211_hdr *hdr;
- int hdrlen, padsize, retval;
+ int retval;
bool decrypt_error = false;
- u8 keyix;
- __le16 fc;
spin_lock_bh(&sc->rx.rxbuflock);
@@ -740,9 +562,15 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
* 2. requeueing the same buffer to h/w
*/
dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
- sc->rx.bufsize,
+ common->rx_bufsize,
DMA_FROM_DEVICE);
+ hdr = (struct ieee80211_hdr *) skb->data;
+ rxs = IEEE80211_SKB_RXCB(skb);
+
+ hw = ath_get_virt_hw(sc, hdr);
+ rx_stats = &ds->ds_rxstat;
+
/*
* If we're asked to flush receive queue, directly
* chain it back at the queue without processing it.
@@ -750,19 +578,14 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
if (flush)
goto requeue;
- if (!ds->ds_rxstat.rs_datalen)
- goto requeue;
-
- /* The status portion of the descriptor could get corrupted. */
- if (sc->rx.bufsize < ds->ds_rxstat.rs_datalen)
- goto requeue;
-
- if (!ath_rx_prepare(skb, ds, &rx_status, &decrypt_error, sc))
+ retval = ath9k_cmn_rx_skb_preprocess(common, hw, skb, rx_stats,
+ rxs, &decrypt_error);
+ if (retval)
goto requeue;
/* Ensure we always have an skb to requeue once we are done
* processing the current buffer's skb */
- requeue_skb = ath_rxbuf_alloc(common, sc->rx.bufsize, GFP_ATOMIC);
+ requeue_skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_ATOMIC);
/* If there is no memory we ignore the current RX'd frame,
* tell hardware it can give us a new frame using the old
@@ -773,60 +596,26 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
/* Unmap the frame */
dma_unmap_single(sc->dev, bf->bf_buf_addr,
- sc->rx.bufsize,
+ common->rx_bufsize,
DMA_FROM_DEVICE);
- skb_put(skb, ds->ds_rxstat.rs_datalen);
-
- /* 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;
-
- /* 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 - hdrlen % 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 = hdrlen & 3;
- if (padsize && hdrlen >= 24) {
- memmove(skb->data + padsize, skb->data, hdrlen);
- skb_pull(skb, padsize);
- }
-
- keyix = ds->ds_rxstat.rs_keyix;
+ skb_put(skb, rx_stats->rs_datalen);
- if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error) {
- rx_status.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, sc->keymap))
- rx_status.flag |= RX_FLAG_DECRYPTED;
- }
- if (ah->sw_mgmt_crypto &&
- (rx_status.flag & RX_FLAG_DECRYPTED) &&
- ieee80211_is_mgmt(fc)) {
- /* Use software decrypt for management frames. */
- rx_status.flag &= ~RX_FLAG_DECRYPTED;
- }
+ ath9k_cmn_rx_skb_postprocess(common, skb, rx_stats,
+ rxs, decrypt_error);
/* We will now give hardware our shiny new allocated skb */
bf->bf_mpdu = requeue_skb;
bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
- sc->rx.bufsize,
- DMA_FROM_DEVICE);
+ common->rx_bufsize,
+ DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(sc->dev,
bf->bf_buf_addr))) {
dev_kfree_skb_any(requeue_skb);
bf->bf_mpdu = NULL;
ath_print(common, ATH_DBG_FATAL,
"dma_mapping_error() on RX\n");
- ath_rx_send_to_mac80211(sc, skb, &rx_status);
+ ath_rx_send_to_mac80211(hw, sc, skb, rxs);
break;
}
bf->bf_dmacontext = bf->bf_buf_addr;
@@ -837,7 +626,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
*/
if (sc->rx.defant != ds->ds_rxstat.rs_antenna) {
if (++sc->rx.rxotherant >= 3)
- ath_setdefantenna(sc, ds->ds_rxstat.rs_antenna);
+ ath_setdefantenna(sc, rx_stats->rs_antenna);
} else {
sc->rx.rxotherant = 0;
}
@@ -847,7 +636,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
SC_OP_WAIT_FOR_PSPOLL_DATA)))
ath_rx_ps(sc, skb);
- ath_rx_send_to_mac80211(sc, skb, &rx_status);
+ ath_rx_send_to_mac80211(hw, sc, skb, rxs);
requeue:
list_move_tail(&bf->list, &sc->rx.rxbuf);