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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-02-24 14:31:04 -0500
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-02-24 14:33:45 -0500
commit109d28152b6e9d5de64cd23e3bc08885ccb3d1ef (patch)
treeb7b8863faa05254781acfb85cc41da3eef467c6b /drivers/net/wireless/iwlwifi/iwl-rx.c
parent168cf9af699e87d5a6f44b684583714ecabb8e71 (diff)
parent60b341b778cc2929df16c0a504c91621b3c6a4ad (diff)
Merge tag 'v2.6.33' for its firewire changes since last branch point
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-rx.c')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-rx.c61
1 files changed, 8 insertions, 53 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index 6090bc15a6d5..2dbce85404aa 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -345,10 +345,8 @@ void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
345 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma, 345 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
346 PAGE_SIZE << priv->hw_params.rx_page_order, 346 PAGE_SIZE << priv->hw_params.rx_page_order,
347 PCI_DMA_FROMDEVICE); 347 PCI_DMA_FROMDEVICE);
348 __free_pages(rxq->pool[i].page, 348 __iwl_free_pages(priv, rxq->pool[i].page);
349 priv->hw_params.rx_page_order);
350 rxq->pool[i].page = NULL; 349 rxq->pool[i].page = NULL;
351 priv->alloc_rxb_page--;
352 } 350 }
353 } 351 }
354 352
@@ -416,9 +414,7 @@ void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
416 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma, 414 pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
417 PAGE_SIZE << priv->hw_params.rx_page_order, 415 PAGE_SIZE << priv->hw_params.rx_page_order,
418 PCI_DMA_FROMDEVICE); 416 PCI_DMA_FROMDEVICE);
419 priv->alloc_rxb_page--; 417 __iwl_free_pages(priv, rxq->pool[i].page);
420 __free_pages(rxq->pool[i].page,
421 priv->hw_params.rx_page_order);
422 rxq->pool[i].page = NULL; 418 rxq->pool[i].page = NULL;
423 } 419 }
424 list_add_tail(&rxq->pool[i].list, &rxq->rx_used); 420 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
@@ -654,47 +650,6 @@ void iwl_reply_statistics(struct iwl_priv *priv,
654} 650}
655EXPORT_SYMBOL(iwl_reply_statistics); 651EXPORT_SYMBOL(iwl_reply_statistics);
656 652
657#define PERFECT_RSSI (-20) /* dBm */
658#define WORST_RSSI (-95) /* dBm */
659#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
660
661/* Calculate an indication of rx signal quality (a percentage, not dBm!).
662 * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
663 * about formulas used below. */
664static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
665{
666 int sig_qual;
667 int degradation = PERFECT_RSSI - rssi_dbm;
668
669 /* If we get a noise measurement, use signal-to-noise ratio (SNR)
670 * as indicator; formula is (signal dbm - noise dbm).
671 * SNR at or above 40 is a great signal (100%).
672 * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
673 * Weakest usable signal is usually 10 - 15 dB SNR. */
674 if (noise_dbm) {
675 if (rssi_dbm - noise_dbm >= 40)
676 return 100;
677 else if (rssi_dbm < noise_dbm)
678 return 0;
679 sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
680
681 /* Else use just the signal level.
682 * This formula is a least squares fit of data points collected and
683 * compared with a reference system that had a percentage (%) display
684 * for signal quality. */
685 } else
686 sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
687 (15 * RSSI_RANGE + 62 * degradation)) /
688 (RSSI_RANGE * RSSI_RANGE);
689
690 if (sig_qual > 100)
691 sig_qual = 100;
692 else if (sig_qual < 1)
693 sig_qual = 0;
694
695 return sig_qual;
696}
697
698/* Calc max signal level (dBm) among 3 possible receivers */ 653/* Calc max signal level (dBm) among 3 possible receivers */
699static inline int iwl_calc_rssi(struct iwl_priv *priv, 654static inline int iwl_calc_rssi(struct iwl_priv *priv,
700 struct iwl_rx_phy_res *rx_resp) 655 struct iwl_rx_phy_res *rx_resp)
@@ -973,7 +928,10 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
973 if (ieee80211_is_mgmt(fc) || 928 if (ieee80211_is_mgmt(fc) ||
974 ieee80211_has_protected(fc) || 929 ieee80211_has_protected(fc) ||
975 ieee80211_has_morefrags(fc) || 930 ieee80211_has_morefrags(fc) ||
976 le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) 931 le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG ||
932 (ieee80211_is_data_qos(fc) &&
933 *ieee80211_get_qos_ctl(hdr) &
934 IEEE80211_QOS_CONTROL_A_MSDU_PRESENT))
977 ret = skb_linearize(skb); 935 ret = skb_linearize(skb);
978 else 936 else
979 ret = __pskb_pull_tail(skb, min_t(u16, IWL_LINK_HDR_MAX, len)) ? 937 ret = __pskb_pull_tail(skb, min_t(u16, IWL_LINK_HDR_MAX, len)) ?
@@ -1105,11 +1063,8 @@ void iwl_rx_reply_rx(struct iwl_priv *priv,
1105 if (iwl_is_associated(priv) && 1063 if (iwl_is_associated(priv) &&
1106 !test_bit(STATUS_SCANNING, &priv->status)) { 1064 !test_bit(STATUS_SCANNING, &priv->status)) {
1107 rx_status.noise = priv->last_rx_noise; 1065 rx_status.noise = priv->last_rx_noise;
1108 rx_status.qual = iwl_calc_sig_qual(rx_status.signal,
1109 rx_status.noise);
1110 } else { 1066 } else {
1111 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE; 1067 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
1112 rx_status.qual = iwl_calc_sig_qual(rx_status.signal, 0);
1113 } 1068 }
1114 1069
1115 /* Reset beacon noise level if not associated. */ 1070 /* Reset beacon noise level if not associated. */
@@ -1122,8 +1077,8 @@ void iwl_rx_reply_rx(struct iwl_priv *priv,
1122 iwl_dbg_report_frame(priv, phy_res, len, header, 1); 1077 iwl_dbg_report_frame(priv, phy_res, len, header, 1);
1123#endif 1078#endif
1124 iwl_dbg_log_rx_data_frame(priv, len, header); 1079 iwl_dbg_log_rx_data_frame(priv, len, header);
1125 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, noise %d, qual %d, TSF %llu\n", 1080 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, noise %d, TSF %llu\n",
1126 rx_status.signal, rx_status.noise, rx_status.qual, 1081 rx_status.signal, rx_status.noise,
1127 (unsigned long long)rx_status.mactime); 1082 (unsigned long long)rx_status.mactime);
1128 1083
1129 /* 1084 /*