diff options
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/recv.c')
-rw-r--r-- | drivers/net/wireless/ath/ath9k/recv.c | 296 |
1 files changed, 281 insertions, 15 deletions
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c index ca6065b71b4..da0cfe90c38 100644 --- a/drivers/net/wireless/ath/ath9k/recv.c +++ b/drivers/net/wireless/ath/ath9k/recv.c @@ -116,9 +116,6 @@ static void ath_opmode_init(struct ath_softc *sc) /* configure operational mode */ ath9k_hw_setopmode(ah); - /* Handle any link-level address change. */ - ath9k_hw_setmac(ah, common->macaddr); - /* calculate and install multicast filter */ mfilt[0] = mfilt[1] = ~0; ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]); @@ -295,7 +292,7 @@ static void ath_edma_start_recv(struct ath_softc *sc) ath_opmode_init(sc); - ath9k_hw_startpcureceive(sc->sc_ah); + ath9k_hw_startpcureceive(sc->sc_ah, (sc->sc_flags & SC_OP_SCANNING)); } static void ath_edma_stop_recv(struct ath_softc *sc) @@ -501,7 +498,7 @@ int ath_startrecv(struct ath_softc *sc) start_recv: spin_unlock_bh(&sc->rx.rxbuflock); ath_opmode_init(sc); - ath9k_hw_startpcureceive(ah); + ath9k_hw_startpcureceive(ah, (sc->sc_flags & SC_OP_SCANNING)); return 0; } @@ -700,12 +697,16 @@ static bool ath_edma_get_buffers(struct ath_softc *sc, bf = SKB_CB_ATHBUF(skb); BUG_ON(!bf); - dma_sync_single_for_device(sc->dev, bf->bf_buf_addr, + dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr, common->rx_bufsize, DMA_FROM_DEVICE); ret = ath9k_hw_process_rxdesc_edma(ah, NULL, skb->data); - if (ret == -EINPROGRESS) + if (ret == -EINPROGRESS) { + /*let device gain the buffer again*/ + dma_sync_single_for_device(sc->dev, bf->bf_buf_addr, + common->rx_bufsize, DMA_FROM_DEVICE); return false; + } __skb_unlink(skb, &rx_edma->rx_fifo); if (ret == -EINVAL) { @@ -814,13 +815,263 @@ static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc, * 1. accessing the frame * 2. requeueing the same buffer to h/w */ - dma_sync_single_for_device(sc->dev, bf->bf_buf_addr, + dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr, common->rx_bufsize, DMA_FROM_DEVICE); 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) +{ + 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->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) { @@ -842,15 +1093,21 @@ 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; + u64 tsf = 0; + u32 tsf_lower = 0; 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); + tsf = ath9k_hw_gettsf64(ah); + tsf_lower = tsf & 0xffffffff; + do { /* If handling rx interrupt and flush is in progress => exit */ if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0)) @@ -869,7 +1126,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp) 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); @@ -883,8 +1140,17 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp) if (flush) goto requeue; - retval = ath9k_cmn_rx_skb_preprocess(common, hw, skb, &rs, - rxs, &decrypt_error); + rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp; + if (rs.rs_tstamp > tsf_lower && + unlikely(rs.rs_tstamp - tsf_lower > 0x10000000)) + rxs->mactime -= 0x100000000ULL; + + if (rs.rs_tstamp < tsf_lower && + unlikely(tsf_lower - rs.rs_tstamp > 0x10000000)) + rxs->mactime += 0x100000000ULL; + + retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs, + rxs, &decrypt_error); if (retval) goto requeue; @@ -908,8 +1174,8 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp) 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; |