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iwlwifi: move RX handlers to iwl-rx.c 

This patch moves RX handlers to iwl-rx.c

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Emmanuel Grumbach 2008-06-30 17:23:09 +08:00 committed by John W. Linville
parent 37deb2a0ba
commit 1781a07fbe
5 changed files with 861 additions and 860 deletions
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703
drivers/net/wireless/iwlwifi/iwl-4965.c
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@ -1929,707 +1929,6 @@ static void iwl4965_temperature_calib(struct iwl_priv *priv,
queue_work(priv->workqueue, &priv->txpower_work); queue_work(priv->workqueue, &priv->txpower_work);
} }
static void iwl4965_add_radiotap(struct iwl_priv *priv,
struct sk_buff *skb,
struct iwl4965_rx_phy_res *rx_start,
struct ieee80211_rx_status *stats,
u32 ampdu_status)
{
s8 signal = stats->signal;
s8 noise = 0;
int rate = stats->rate_idx;
u64 tsf = stats->mactime;
__le16 antenna;
__le16 phy_flags_hw = rx_start->phy_flags;
struct iwl4965_rt_rx_hdr {
struct ieee80211_radiotap_header rt_hdr;
__le64 rt_tsf; /* TSF */
u8 rt_flags; /* radiotap packet flags */
u8 rt_rate; /* rate in 500kb/s */
__le16 rt_channelMHz; /* channel in MHz */
__le16 rt_chbitmask; /* channel bitfield */
s8 rt_dbmsignal; /* signal in dBm, kluged to signed */
s8 rt_dbmnoise;
u8 rt_antenna; /* antenna number */
} __attribute__ ((packed)) *iwl4965_rt;
/* TODO: We won't have enough headroom for HT frames. Fix it later. */
if (skb_headroom(skb) < sizeof(*iwl4965_rt)) {
if (net_ratelimit())
printk(KERN_ERR "not enough headroom [%d] for "
"radiotap head [%zd]\n",
skb_headroom(skb), sizeof(*iwl4965_rt));
return;
}
/* put radiotap header in front of 802.11 header and data */
iwl4965_rt = (void *)skb_push(skb, sizeof(*iwl4965_rt));
/* initialise radiotap header */
iwl4965_rt->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
iwl4965_rt->rt_hdr.it_pad = 0;
/* total header + data */
put_unaligned(cpu_to_le16(sizeof(*iwl4965_rt)),
&iwl4965_rt->rt_hdr.it_len);
/* Indicate all the fields we add to the radiotap header */
put_unaligned(cpu_to_le32((1 << IEEE80211_RADIOTAP_TSFT) |
(1 << IEEE80211_RADIOTAP_FLAGS) |
(1 << IEEE80211_RADIOTAP_RATE) |
(1 << IEEE80211_RADIOTAP_CHANNEL) |
(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) |
(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE) |
(1 << IEEE80211_RADIOTAP_ANTENNA)),
&iwl4965_rt->rt_hdr.it_present);
/* Zero the flags, we'll add to them as we go */
iwl4965_rt->rt_flags = 0;
put_unaligned(cpu_to_le64(tsf), &iwl4965_rt->rt_tsf);
iwl4965_rt->rt_dbmsignal = signal;
iwl4965_rt->rt_dbmnoise = noise;
/* Convert the channel frequency and set the flags */
put_unaligned(cpu_to_le16(stats->freq), &iwl4965_rt->rt_channelMHz);
if (!(phy_flags_hw & RX_RES_PHY_FLAGS_BAND_24_MSK))
put_unaligned(cpu_to_le16(IEEE80211_CHAN_OFDM |
IEEE80211_CHAN_5GHZ),
&iwl4965_rt->rt_chbitmask);
else if (phy_flags_hw & RX_RES_PHY_FLAGS_MOD_CCK_MSK)
put_unaligned(cpu_to_le16(IEEE80211_CHAN_CCK |
IEEE80211_CHAN_2GHZ),
&iwl4965_rt->rt_chbitmask);
else /* 802.11g */
put_unaligned(cpu_to_le16(IEEE80211_CHAN_OFDM |
IEEE80211_CHAN_2GHZ),
&iwl4965_rt->rt_chbitmask);
if (rate == -1)
iwl4965_rt->rt_rate = 0;
else
iwl4965_rt->rt_rate = iwl_rates[rate].ieee;
/*
* "antenna number"
*
* It seems that the antenna field in the phy flags value
* is actually a bitfield. This is undefined by radiotap,
* it wants an actual antenna number but I always get "7"
* for most legacy frames I receive indicating that the
* same frame was received on all three RX chains.
*
* I think this field should be removed in favour of a
* new 802.11n radiotap field "RX chains" that is defined
* as a bitmask.
*/
antenna = phy_flags_hw & RX_RES_PHY_FLAGS_ANTENNA_MSK;
iwl4965_rt->rt_antenna = le16_to_cpu(antenna) >> 4;
/* set the preamble flag if appropriate */
if (phy_flags_hw & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
iwl4965_rt->rt_flags |= IEEE80211_RADIOTAP_F_SHORTPRE;
stats->flag |= RX_FLAG_RADIOTAP;
}
static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
{
/* 0 - mgmt, 1 - cnt, 2 - data */
int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
priv->rx_stats[idx].cnt++;
priv->rx_stats[idx].bytes += len;
}
/*
* returns non-zero if packet should be dropped
*/
static int iwl4965_set_decrypted_flag(struct iwl_priv *priv,
struct ieee80211_hdr *hdr,
u32 decrypt_res,
struct ieee80211_rx_status *stats)
{
u16 fc = le16_to_cpu(hdr->frame_control);
if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
return 0;
if (!(fc & IEEE80211_FCTL_PROTECTED))
return 0;
IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res);
switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
case RX_RES_STATUS_SEC_TYPE_TKIP:
/* The uCode has got a bad phase 1 Key, pushes the packet.
* Decryption will be done in SW. */
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
RX_RES_STATUS_BAD_KEY_TTAK)
break;
case RX_RES_STATUS_SEC_TYPE_WEP:
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
RX_RES_STATUS_BAD_ICV_MIC) {
/* bad ICV, the packet is destroyed since the
* decryption is inplace, drop it */
IWL_DEBUG_RX("Packet destroyed\n");
return -1;
}
case RX_RES_STATUS_SEC_TYPE_CCMP:
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
RX_RES_STATUS_DECRYPT_OK) {
IWL_DEBUG_RX("hw decrypt successfully!!!\n");
stats->flag |= RX_FLAG_DECRYPTED;
}
break;
default:
break;
}
return 0;
}
static u32 iwl4965_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
{
u32 decrypt_out = 0;
if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
RX_RES_STATUS_STATION_FOUND)
decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
/* packet was not encrypted */
if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
RX_RES_STATUS_SEC_TYPE_NONE)
return decrypt_out;
/* packet was encrypted with unknown alg */
if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
RX_RES_STATUS_SEC_TYPE_ERR)
return decrypt_out;
/* decryption was not done in HW */
if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
RX_MPDU_RES_STATUS_DEC_DONE_MSK)
return decrypt_out;
switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
case RX_RES_STATUS_SEC_TYPE_CCMP:
/* alg is CCM: check MIC only */
if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
/* Bad MIC */
decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
else
decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
break;
case RX_RES_STATUS_SEC_TYPE_TKIP:
if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
/* Bad TTAK */
decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
break;
}
/* fall through if TTAK OK */
default:
if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
else
decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
break;
};
IWL_DEBUG_RX("decrypt_in:0x%x decrypt_out = 0x%x\n",
decrypt_in, decrypt_out);
return decrypt_out;
}
static void iwl4965_handle_data_packet(struct iwl_priv *priv, int is_data,
int include_phy,
struct iwl_rx_mem_buffer *rxb,
struct ieee80211_rx_status *stats)
{
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
(struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
struct ieee80211_hdr *hdr;
u16 len;
__le32 *rx_end;
unsigned int skblen;
u32 ampdu_status;
u32 ampdu_status_legacy;
if (!include_phy && priv->last_phy_res[0])
rx_start = (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
if (!rx_start) {
IWL_ERROR("MPDU frame without a PHY data\n");
return;
}
if (include_phy) {
hdr = (struct ieee80211_hdr *)((u8 *) & rx_start[1] +
rx_start->cfg_phy_cnt);
len = le16_to_cpu(rx_start->byte_count);
rx_end = (__le32 *) ((u8 *) & pkt->u.raw[0] +
sizeof(struct iwl4965_rx_phy_res) +
rx_start->cfg_phy_cnt + len);
} else {
struct iwl4965_rx_mpdu_res_start *amsdu =
(struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
hdr = (struct ieee80211_hdr *)(pkt->u.raw +
sizeof(struct iwl4965_rx_mpdu_res_start));
len = le16_to_cpu(amsdu->byte_count);
rx_start->byte_count = amsdu->byte_count;
rx_end = (__le32 *) (((u8 *) hdr) + len);
}
/* In monitor mode allow 802.11 ACk frames (10 bytes) */
if (len > priv->hw_params.max_pkt_size ||
len < ((priv->iw_mode == IEEE80211_IF_TYPE_MNTR) ? 10 : 16)) {
IWL_WARNING("byte count out of range [16,4K] : %d\n", len);
return;
}
ampdu_status = le32_to_cpu(*rx_end);
skblen = ((u8 *) rx_end - (u8 *) & pkt->u.raw[0]) + sizeof(u32);
if (!include_phy) {
/* New status scheme, need to translate */
ampdu_status_legacy = ampdu_status;
ampdu_status = iwl4965_translate_rx_status(priv, ampdu_status);
}
/* start from MAC */
skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
skb_put(rxb->skb, len); /* end where data ends */
/* We only process data packets if the interface is open */
if (unlikely(!priv->is_open)) {
IWL_DEBUG_DROP_LIMIT
("Dropping packet while interface is not open.\n");
return;
}
stats->flag = 0;
hdr = (struct ieee80211_hdr *)rxb->skb->data;
/* in case of HW accelerated crypto and bad decryption, drop */
if (!priv->hw_params.sw_crypto &&
iwl4965_set_decrypted_flag(priv, hdr, ampdu_status, stats))
return;
if (priv->add_radiotap)
iwl4965_add_radiotap(priv, rxb->skb, rx_start, stats, ampdu_status);
iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
priv->alloc_rxb_skb--;
rxb->skb = NULL;
}
/* Calc max signal level (dBm) among 3 possible receivers */
static int iwl4965_calc_rssi(struct iwl_priv *priv,
struct iwl4965_rx_phy_res *rx_resp)
{
/* data from PHY/DSP regarding signal strength, etc.,
* contents are always there, not configurable by host. */
struct iwl4965_rx_non_cfg_phy *ncphy =
(struct iwl4965_rx_non_cfg_phy *)rx_resp->non_cfg_phy;
u32 agc = (le16_to_cpu(ncphy->agc_info) & IWL_AGC_DB_MASK)
>> IWL_AGC_DB_POS;
u32 valid_antennae =
(le16_to_cpu(rx_resp->phy_flags) & RX_PHY_FLAGS_ANTENNAE_MASK)
>> RX_PHY_FLAGS_ANTENNAE_OFFSET;
u8 max_rssi = 0;
u32 i;
/* Find max rssi among 3 possible receivers.
* These values are measured by the digital signal processor (DSP).
* They should stay fairly constant even as the signal strength varies,
* if the radio's automatic gain control (AGC) is working right.
* AGC value (see below) will provide the "interesting" info. */
for (i = 0; i < 3; i++)
if (valid_antennae & (1 << i))
max_rssi = max(ncphy->rssi_info[i << 1], max_rssi);
IWL_DEBUG_STATS("Rssi In A %d B %d C %d Max %d AGC dB %d\n",
ncphy->rssi_info[0], ncphy->rssi_info[2], ncphy->rssi_info[4],
max_rssi, agc);
/* dBm = max_rssi dB - agc dB - constant.
* Higher AGC (higher radio gain) means lower signal. */
return (max_rssi - agc - IWL_RSSI_OFFSET);
}
static void iwl4965_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
{
unsigned long flags;
spin_lock_irqsave(&priv->sta_lock, flags);
priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
priv->stations[sta_id].sta.sta.modify_mask = 0;
priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
spin_unlock_irqrestore(&priv->sta_lock, flags);
iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
}
static void iwl4965_update_ps_mode(struct iwl_priv *priv, u16 ps_bit, u8 *addr)
{
/* FIXME: need locking over ps_status ??? */
u8 sta_id = iwl_find_station(priv, addr);
if (sta_id != IWL_INVALID_STATION) {
u8 sta_awake = priv->stations[sta_id].
ps_status == STA_PS_STATUS_WAKE;
if (sta_awake && ps_bit)
priv->stations[sta_id].ps_status = STA_PS_STATUS_SLEEP;
else if (!sta_awake && !ps_bit) {
iwl4965_sta_modify_ps_wake(priv, sta_id);
priv->stations[sta_id].ps_status = STA_PS_STATUS_WAKE;
}
}
}
#ifdef CONFIG_IWLWIFI_DEBUG
/**
* iwl4965_dbg_report_frame - dump frame to syslog during debug sessions
*
* You may hack this function to show different aspects of received frames,
* including selective frame dumps.
* group100 parameter selects whether to show 1 out of 100 good frames.
*
* TODO: This was originally written for 3945, need to audit for
* proper operation with 4965.
*/
static void iwl4965_dbg_report_frame(struct iwl_priv *priv,
struct iwl_rx_packet *pkt,
struct ieee80211_hdr *header, int group100)
{
u32 to_us;
u32 print_summary = 0;
u32 print_dump = 0; /* set to 1 to dump all frames' contents */
u32 hundred = 0;
u32 dataframe = 0;
__le16 fc;
u16 seq_ctl;
u16 channel;
u16 phy_flags;
int rate_sym;
u16 length;
u16 status;
u16 bcn_tmr;
u32 tsf_low;
u64 tsf;
u8 rssi;
u8 agc;
u16 sig_avg;
u16 noise_diff;
struct iwl4965_rx_frame_stats *rx_stats = IWL_RX_STATS(pkt);
struct iwl4965_rx_frame_hdr *rx_hdr = IWL_RX_HDR(pkt);
struct iwl4965_rx_frame_end *rx_end = IWL_RX_END(pkt);
u8 *data = IWL_RX_DATA(pkt);
if (likely(!(priv->debug_level & IWL_DL_RX)))
return;
/* MAC header */
fc = header->frame_control;
seq_ctl = le16_to_cpu(header->seq_ctrl);
/* metadata */
channel = le16_to_cpu(rx_hdr->channel);
phy_flags = le16_to_cpu(rx_hdr->phy_flags);
rate_sym = rx_hdr->rate;
length = le16_to_cpu(rx_hdr->len);
/* end-of-frame status and timestamp */
status = le32_to_cpu(rx_end->status);
bcn_tmr = le32_to_cpu(rx_end->beacon_timestamp);
tsf_low = le64_to_cpu(rx_end->timestamp) & 0x0ffffffff;
tsf = le64_to_cpu(rx_end->timestamp);
/* signal statistics */
rssi = rx_stats->rssi;
agc = rx_stats->agc;
sig_avg = le16_to_cpu(rx_stats->sig_avg);
noise_diff = le16_to_cpu(rx_stats->noise_diff);
to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
/* if data frame is to us and all is good,
* (optionally) print summary for only 1 out of every 100 */
if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
dataframe = 1;
if (!group100)
print_summary = 1; /* print each frame */
else if (priv->framecnt_to_us < 100) {
priv->framecnt_to_us++;
print_summary = 0;
} else {
priv->framecnt_to_us = 0;
print_summary = 1;
hundred = 1;
}
} else {
/* print summary for all other frames */
print_summary = 1;
}
if (print_summary) {
char *title;
int rate_idx;
u32 bitrate;
if (hundred)
title = "100Frames";
else if (ieee80211_has_retry(fc))
title = "Retry";
else if (ieee80211_is_assoc_resp(fc))
title = "AscRsp";
else if (ieee80211_is_reassoc_resp(fc))
title = "RasRsp";
else if (ieee80211_is_probe_resp(fc)) {
title = "PrbRsp";
print_dump = 1; /* dump frame contents */
} else if (ieee80211_is_beacon(fc)) {
title = "Beacon";
print_dump = 1; /* dump frame contents */
} else if (ieee80211_is_atim(fc))
title = "ATIM";
else if (ieee80211_is_auth(fc))
title = "Auth";
else if (ieee80211_is_deauth(fc))
title = "DeAuth";
else if (ieee80211_is_disassoc(fc))
title = "DisAssoc";
else
title = "Frame";
rate_idx = iwl_hwrate_to_plcp_idx(rate_sym);
if (unlikely(rate_idx == -1))
bitrate = 0;
else
bitrate = iwl_rates[rate_idx].ieee / 2;
/* print frame summary.
* MAC addresses show just the last byte (for brevity),
* but you can hack it to show more, if you'd like to. */
if (dataframe)
IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
"len=%u, rssi=%d, chnl=%d, rate=%u, \n",
title, le16_to_cpu(fc), header->addr1[5],
length, rssi, channel, bitrate);
else {
/* src/dst addresses assume managed mode */
IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, "
"src=0x%02x, rssi=%u, tim=%lu usec, "
"phy=0x%02x, chnl=%d\n",
title, le16_to_cpu(fc), header->addr1[5],
header->addr3[5], rssi,
tsf_low - priv->scan_start_tsf,
phy_flags, channel);
}
}
if (print_dump)
iwl_print_hex_dump(priv, IWL_DL_RX, data, length);
}
#else
static inline void iwl4965_dbg_report_frame(struct iwl_priv *priv,
struct iwl_rx_packet *pkt,
struct ieee80211_hdr *header,
int group100)
{
}
#endif
/* Called for REPLY_RX (legacy ABG frames), or
* REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
void iwl4965_rx_reply_rx(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct ieee80211_hdr *header;
struct ieee80211_rx_status rx_status;
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
/* Use phy data (Rx signal strength, etc.) contained within
* this rx packet for legacy frames,
* or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
int include_phy = (pkt->hdr.cmd == REPLY_RX);
struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
(struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) :
(struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
__le32 *rx_end;
unsigned int len = 0;
u16 fc;
u8 network_packet;
rx_status.mactime = le64_to_cpu(rx_start->timestamp);
rx_status.freq =
ieee80211_channel_to_frequency(le16_to_cpu(rx_start->channel));
rx_status.band = (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
rx_status.rate_idx =
iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start->rate_n_flags));
if (rx_status.band == IEEE80211_BAND_5GHZ)
rx_status.rate_idx -= IWL_FIRST_OFDM_RATE;
rx_status.antenna = 0;
rx_status.flag = 0;
if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
rx_start->cfg_phy_cnt);
return;
}
if (!include_phy) {
if (priv->last_phy_res[0])
rx_start = (struct iwl4965_rx_phy_res *)
&priv->last_phy_res[1];
else
rx_start = NULL;
}
if (!rx_start) {
IWL_ERROR("MPDU frame without a PHY data\n");
return;
}
if (include_phy) {
header = (struct ieee80211_hdr *)((u8 *) & rx_start[1]
+ rx_start->cfg_phy_cnt);
len = le16_to_cpu(rx_start->byte_count);
rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
sizeof(struct iwl4965_rx_phy_res) + len);
} else {
struct iwl4965_rx_mpdu_res_start *amsdu =
(struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
header = (void *)(pkt->u.raw +
sizeof(struct iwl4965_rx_mpdu_res_start));
len = le16_to_cpu(amsdu->byte_count);
rx_end = (__le32 *) (pkt->u.raw +
sizeof(struct iwl4965_rx_mpdu_res_start) + len);
}
if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
!(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
le32_to_cpu(*rx_end));
return;
}
priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);
/* Find max signal strength (dBm) among 3 antenna/receiver chains */
rx_status.signal = iwl4965_calc_rssi(priv, rx_start);
/* Meaningful noise values are available only from beacon statistics,
* which are gathered only when associated, and indicate noise
* only for the associated network channel ...
* Ignore these noise values while scanning (other channels) */
if (iwl_is_associated(priv) &&
!test_bit(STATUS_SCANNING, &priv->status)) {
rx_status.noise = priv->last_rx_noise;
rx_status.qual = iwl4965_calc_sig_qual(rx_status.signal,
rx_status.noise);
} else {
rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
rx_status.qual = iwl4965_calc_sig_qual(rx_status.signal, 0);
}
/* Reset beacon noise level if not associated. */
if (!iwl_is_associated(priv))
priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
/* Set "1" to report good data frames in groups of 100 */
/* FIXME: need to optimze the call: */
iwl4965_dbg_report_frame(priv, pkt, header, 1);
IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
rx_status.signal, rx_status.noise, rx_status.signal,
(unsigned long long)rx_status.mactime);
if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR) {
iwl4965_handle_data_packet(priv, 1, include_phy,
rxb, &rx_status);
return;
}
network_packet = iwl4965_is_network_packet(priv, header);
if (network_packet) {
priv->last_rx_rssi = rx_status.signal;
priv->last_beacon_time = priv->ucode_beacon_time;
priv->last_tsf = le64_to_cpu(rx_start->timestamp);
}
fc = le16_to_cpu(header->frame_control);
switch (fc & IEEE80211_FCTL_FTYPE) {
case IEEE80211_FTYPE_MGMT:
if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
iwl4965_update_ps_mode(priv, fc & IEEE80211_FCTL_PM,
header->addr2);
iwl4965_handle_data_packet(priv, 0, include_phy, rxb, &rx_status);
break;
case IEEE80211_FTYPE_CTL:
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_BACK_REQ:
IWL_DEBUG_HT("IEEE80211_STYPE_BACK_REQ arrived\n");
iwl4965_handle_data_packet(priv, 0, include_phy,
rxb, &rx_status);
break;
default:
break;
}
break;
case IEEE80211_FTYPE_DATA: {
DECLARE_MAC_BUF(mac1);
DECLARE_MAC_BUF(mac2);
DECLARE_MAC_BUF(mac3);
if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
iwl4965_update_ps_mode(priv, fc & IEEE80211_FCTL_PM,
header->addr2);
if (unlikely(!network_packet))
IWL_DEBUG_DROP("Dropping (non network): "
"%s, %s, %s\n",
print_mac(mac1, header->addr1),
print_mac(mac2, header->addr2),
print_mac(mac3, header->addr3));
else if (unlikely(iwl4965_is_duplicate_packet(priv, header)))
IWL_DEBUG_DROP("Dropping (dup): %s, %s, %s\n",
print_mac(mac1, header->addr1),
print_mac(mac2, header->addr2),
print_mac(mac3, header->addr3));
else
iwl4965_handle_data_packet(priv, 1, include_phy, rxb,
&rx_status);
break;
}
default:
break;
}
}
/** /**
* iwl4965_tx_status_reply_compressed_ba - Update tx status from block-ack * iwl4965_tx_status_reply_compressed_ba - Update tx status from block-ack
* *
@ -3253,7 +2552,7 @@ static void iwl4965_rx_reply_tx(struct iwl_priv *priv,
static void iwl4965_rx_handler_setup(struct iwl_priv *priv) static void iwl4965_rx_handler_setup(struct iwl_priv *priv)
{ {
/* Legacy Rx frames */ /* Legacy Rx frames */
priv->rx_handlers[REPLY_RX] = iwl4965_rx_reply_rx; priv->rx_handlers[REPLY_RX] = iwl_rx_reply_rx;
/* Tx response */ /* Tx response */
priv->rx_handlers[REPLY_TX] = iwl4965_rx_reply_tx; priv->rx_handlers[REPLY_TX] = iwl4965_rx_reply_tx;
/* block ack */ /* block ack */

6
drivers/net/wireless/iwlwifi/iwl-core.h
View File

@ -372,7 +372,11 @@ extern void iwl_rf_kill_ct_config(struct iwl_priv *priv);
extern int iwl_send_statistics_request(struct iwl_priv *priv, u8 flags); extern int iwl_send_statistics_request(struct iwl_priv *priv, u8 flags);
extern int iwl_verify_ucode(struct iwl_priv *priv); extern int iwl_verify_ucode(struct iwl_priv *priv);
extern int iwl_send_lq_cmd(struct iwl_priv *priv, extern int iwl_send_lq_cmd(struct iwl_priv *priv,
struct iwl_link_quality_cmd *lq, u8 flags); struct iwl_link_quality_cmd *lq, u8 flags);
extern void iwl_rx_reply_rx(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb);
extern void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb);
static inline int iwl_send_rxon_assoc(struct iwl_priv *priv) static inline int iwl_send_rxon_assoc(struct iwl_priv *priv)
{ {

7
drivers/net/wireless/iwlwifi/iwl-dev.h
View File

@ -591,11 +591,6 @@ extern int iwl_send_add_sta(struct iwl_priv *priv,
struct iwl_addsta_cmd *sta, u8 flags); struct iwl_addsta_cmd *sta, u8 flags);
u8 iwl_add_station_flags(struct iwl_priv *priv, const u8 *addr, int is_ap, u8 iwl_add_station_flags(struct iwl_priv *priv, const u8 *addr, int is_ap,
u8 flags, struct ieee80211_ht_info *ht_info); u8 flags, struct ieee80211_ht_info *ht_info);
extern int iwl4965_is_network_packet(struct iwl_priv *priv,
struct ieee80211_hdr *header);
extern int iwl4965_is_duplicate_packet(struct iwl_priv *priv,
struct ieee80211_hdr *header);
extern int iwl4965_calc_sig_qual(int rssi_dbm, int noise_dbm);
extern unsigned int iwl4965_fill_beacon_frame(struct iwl_priv *priv, extern unsigned int iwl4965_fill_beacon_frame(struct iwl_priv *priv,
struct ieee80211_hdr *hdr, struct ieee80211_hdr *hdr,
const u8 *dest, int left); const u8 *dest, int left);
@ -625,8 +620,6 @@ extern void iwl_txq_ctx_stop(struct iwl_priv *priv);
extern unsigned int iwl4965_hw_get_beacon_cmd(struct iwl_priv *priv, extern unsigned int iwl4965_hw_get_beacon_cmd(struct iwl_priv *priv,
struct iwl_frame *frame, u8 rate); struct iwl_frame *frame, u8 rate);
extern void iwl4965_disable_events(struct iwl_priv *priv); extern void iwl4965_disable_events(struct iwl_priv *priv);
extern void iwl4965_rx_reply_rx(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb);
extern int iwl4965_hw_channel_switch(struct iwl_priv *priv, u16 channel); extern int iwl4965_hw_channel_switch(struct iwl_priv *priv, u16 channel);
extern int iwl_queue_space(const struct iwl_queue *q); extern int iwl_queue_space(const struct iwl_queue *q);

853
drivers/net/wireless/iwlwifi/iwl-rx.c
View File

@ -27,6 +27,7 @@
* *
*****************************************************************************/ *****************************************************************************/
#include <linux/etherdevice.h>
#include <net/mac80211.h> #include <net/mac80211.h>
#include "iwl-eeprom.h" #include "iwl-eeprom.h"
#include "iwl-dev.h" #include "iwl-dev.h"
@ -541,3 +542,855 @@ void iwl_rx_statistics(struct iwl_priv *priv,
priv->cfg->ops->lib->temperature(priv, &pkt->u.stats); priv->cfg->ops->lib->temperature(priv, &pkt->u.stats);
} }
EXPORT_SYMBOL(iwl_rx_statistics); EXPORT_SYMBOL(iwl_rx_statistics);
#define PERFECT_RSSI (-20) /* dBm */
#define WORST_RSSI (-95) /* dBm */
#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
/* Calculate an indication of rx signal quality (a percentage, not dBm!).
* See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
* about formulas used below. */
static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
{
int sig_qual;
int degradation = PERFECT_RSSI - rssi_dbm;
/* If we get a noise measurement, use signal-to-noise ratio (SNR)
* as indicator; formula is (signal dbm - noise dbm).
* SNR at or above 40 is a great signal (100%).
* Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
* Weakest usable signal is usually 10 - 15 dB SNR. */
if (noise_dbm) {
if (rssi_dbm - noise_dbm >= 40)
return 100;
else if (rssi_dbm < noise_dbm)
return 0;
sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
/* Else use just the signal level.
* This formula is a least squares fit of data points collected and
* compared with a reference system that had a percentage (%) display
* for signal quality. */
} else
sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
(15 * RSSI_RANGE + 62 * degradation)) /
(RSSI_RANGE * RSSI_RANGE);
if (sig_qual > 100)
sig_qual = 100;
else if (sig_qual < 1)
sig_qual = 0;
return sig_qual;
}
#ifdef CONFIG_IWLWIFI_DEBUG
/**
* iwl_dbg_report_frame - dump frame to syslog during debug sessions
*
* You may hack this function to show different aspects of received frames,
* including selective frame dumps.
* group100 parameter selects whether to show 1 out of 100 good frames.
*
* TODO: This was originally written for 3945, need to audit for
* proper operation with 4965.
*/
static void iwl_dbg_report_frame(struct iwl_priv *priv,
struct iwl_rx_packet *pkt,
struct ieee80211_hdr *header, int group100)
{
u32 to_us;
u32 print_summary = 0;
u32 print_dump = 0; /* set to 1 to dump all frames' contents */
u32 hundred = 0;
u32 dataframe = 0;
__le16 fc;
u16 seq_ctl;
u16 channel;
u16 phy_flags;
int rate_sym;
u16 length;
u16 status;
u16 bcn_tmr;
u32 tsf_low;
u64 tsf;
u8 rssi;
u8 agc;
u16 sig_avg;
u16 noise_diff;
struct iwl4965_rx_frame_stats *rx_stats = IWL_RX_STATS(pkt);
struct iwl4965_rx_frame_hdr *rx_hdr = IWL_RX_HDR(pkt);
struct iwl4965_rx_frame_end *rx_end = IWL_RX_END(pkt);
u8 *data = IWL_RX_DATA(pkt);
if (likely(!(priv->debug_level & IWL_DL_RX)))
return;
/* MAC header */
fc = header->frame_control;
seq_ctl = le16_to_cpu(header->seq_ctrl);
/* metadata */
channel = le16_to_cpu(rx_hdr->channel);
phy_flags = le16_to_cpu(rx_hdr->phy_flags);
rate_sym = rx_hdr->rate;
length = le16_to_cpu(rx_hdr->len);
/* end-of-frame status and timestamp */
status = le32_to_cpu(rx_end->status);
bcn_tmr = le32_to_cpu(rx_end->beacon_timestamp);
tsf_low = le64_to_cpu(rx_end->timestamp) & 0x0ffffffff;
tsf = le64_to_cpu(rx_end->timestamp);
/* signal statistics */
rssi = rx_stats->rssi;
agc = rx_stats->agc;
sig_avg = le16_to_cpu(rx_stats->sig_avg);
noise_diff = le16_to_cpu(rx_stats->noise_diff);
to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
/* if data frame is to us and all is good,
* (optionally) print summary for only 1 out of every 100 */
if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
dataframe = 1;
if (!group100)
print_summary = 1; /* print each frame */
else if (priv->framecnt_to_us < 100) {
priv->framecnt_to_us++;
print_summary = 0;
} else {
priv->framecnt_to_us = 0;
print_summary = 1;
hundred = 1;
}
} else {
/* print summary for all other frames */
print_summary = 1;
}
if (print_summary) {
char *title;
int rate_idx;
u32 bitrate;
if (hundred)
title = "100Frames";
else if (ieee80211_has_retry(fc))
title = "Retry";
else if (ieee80211_is_assoc_resp(fc))
title = "AscRsp";
else if (ieee80211_is_reassoc_resp(fc))
title = "RasRsp";
else if (ieee80211_is_probe_resp(fc)) {
title = "PrbRsp";
print_dump = 1; /* dump frame contents */
} else if (ieee80211_is_beacon(fc)) {
title = "Beacon";
print_dump = 1; /* dump frame contents */
} else if (ieee80211_is_atim(fc))
title = "ATIM";
else if (ieee80211_is_auth(fc))
title = "Auth";
else if (ieee80211_is_deauth(fc))
title = "DeAuth";
else if (ieee80211_is_disassoc(fc))
title = "DisAssoc";
else
title = "Frame";
rate_idx = iwl_hwrate_to_plcp_idx(rate_sym);
if (unlikely(rate_idx == -1))
bitrate = 0;
else
bitrate = iwl_rates[rate_idx].ieee / 2;
/* print frame summary.
* MAC addresses show just the last byte (for brevity),
* but you can hack it to show more, if you'd like to. */
if (dataframe)
IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
"len=%u, rssi=%d, chnl=%d, rate=%u, \n",
title, le16_to_cpu(fc), header->addr1[5],
length, rssi, channel, bitrate);
else {
/* src/dst addresses assume managed mode */
IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, "
"src=0x%02x, rssi=%u, tim=%lu usec, "
"phy=0x%02x, chnl=%d\n",
title, le16_to_cpu(fc), header->addr1[5],
header->addr3[5], rssi,
tsf_low - priv->scan_start_tsf,
phy_flags, channel);
}
}
if (print_dump)
iwl_print_hex_dump(priv, IWL_DL_RX, data, length);
}
#else
static inline void iwl_dbg_report_frame(struct iwl_priv *priv,
struct iwl_rx_packet *pkt,
struct ieee80211_hdr *header,
int group100)
{
}
#endif
static void iwl_add_radiotap(struct iwl_priv *priv,
struct sk_buff *skb,
struct iwl4965_rx_phy_res *rx_start,
struct ieee80211_rx_status *stats,
u32 ampdu_status)
{
s8 signal = stats->signal;
s8 noise = 0;
int rate = stats->rate_idx;
u64 tsf = stats->mactime;
__le16 antenna;
__le16 phy_flags_hw = rx_start->phy_flags;
struct iwl4965_rt_rx_hdr {
struct ieee80211_radiotap_header rt_hdr;
__le64 rt_tsf; /* TSF */
u8 rt_flags; /* radiotap packet flags */
u8 rt_rate; /* rate in 500kb/s */
__le16 rt_channelMHz; /* channel in MHz */
__le16 rt_chbitmask; /* channel bitfield */
s8 rt_dbmsignal; /* signal in dBm, kluged to signed */
s8 rt_dbmnoise;
u8 rt_antenna; /* antenna number */
} __attribute__ ((packed)) *iwl4965_rt;
/* TODO: We won't have enough headroom for HT frames. Fix it later. */
if (skb_headroom(skb) < sizeof(*iwl4965_rt)) {
if (net_ratelimit())
printk(KERN_ERR "not enough headroom [%d] for "
"radiotap head [%zd]\n",
skb_headroom(skb), sizeof(*iwl4965_rt));
return;
}
/* put radiotap header in front of 802.11 header and data */
iwl4965_rt = (void *)skb_push(skb, sizeof(*iwl4965_rt));
/* initialise radiotap header */
iwl4965_rt->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
iwl4965_rt->rt_hdr.it_pad = 0;
/* total header + data */
put_unaligned(cpu_to_le16(sizeof(*iwl4965_rt)),
&iwl4965_rt->rt_hdr.it_len);
/* Indicate all the fields we add to the radiotap header */
put_unaligned(cpu_to_le32((1 << IEEE80211_RADIOTAP_TSFT) |
(1 << IEEE80211_RADIOTAP_FLAGS) |
(1 << IEEE80211_RADIOTAP_RATE) |
(1 << IEEE80211_RADIOTAP_CHANNEL) |
(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) |
(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE) |
(1 << IEEE80211_RADIOTAP_ANTENNA)),
&iwl4965_rt->rt_hdr.it_present);
/* Zero the flags, we'll add to them as we go */
iwl4965_rt->rt_flags = 0;
put_unaligned(cpu_to_le64(tsf), &iwl4965_rt->rt_tsf);
iwl4965_rt->rt_dbmsignal = signal;
iwl4965_rt->rt_dbmnoise = noise;
/* Convert the channel frequency and set the flags */
put_unaligned(cpu_to_le16(stats->freq), &iwl4965_rt->rt_channelMHz);
if (!(phy_flags_hw & RX_RES_PHY_FLAGS_BAND_24_MSK))
put_unaligned(cpu_to_le16(IEEE80211_CHAN_OFDM |
IEEE80211_CHAN_5GHZ),
&iwl4965_rt->rt_chbitmask);
else if (phy_flags_hw & RX_RES_PHY_FLAGS_MOD_CCK_MSK)
put_unaligned(cpu_to_le16(IEEE80211_CHAN_CCK |
IEEE80211_CHAN_2GHZ),
&iwl4965_rt->rt_chbitmask);
else /* 802.11g */
put_unaligned(cpu_to_le16(IEEE80211_CHAN_OFDM |
IEEE80211_CHAN_2GHZ),
&iwl4965_rt->rt_chbitmask);
if (rate == -1)
iwl4965_rt->rt_rate = 0;
else
iwl4965_rt->rt_rate = iwl_rates[rate].ieee;
/*
* "antenna number"
*
* It seems that the antenna field in the phy flags value
* is actually a bitfield. This is undefined by radiotap,
* it wants an actual antenna number but I always get "7"
* for most legacy frames I receive indicating that the
* same frame was received on all three RX chains.
*
* I think this field should be removed in favour of a
* new 802.11n radiotap field "RX chains" that is defined
* as a bitmask.
*/
antenna = phy_flags_hw & RX_RES_PHY_FLAGS_ANTENNA_MSK;
iwl4965_rt->rt_antenna = le16_to_cpu(antenna) >> 4;
/* set the preamble flag if appropriate */
if (phy_flags_hw & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
iwl4965_rt->rt_flags |= IEEE80211_RADIOTAP_F_SHORTPRE;
stats->flag |= RX_FLAG_RADIOTAP;
}
static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
{
/* 0 - mgmt, 1 - cnt, 2 - data */
int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
priv->rx_stats[idx].cnt++;
priv->rx_stats[idx].bytes += len;
}
/*
* returns non-zero if packet should be dropped
*/
static int iwl_set_decrypted_flag(struct iwl_priv *priv,
struct ieee80211_hdr *hdr,
u32 decrypt_res,
struct ieee80211_rx_status *stats)
{
u16 fc = le16_to_cpu(hdr->frame_control);
if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
return 0;
if (!(fc & IEEE80211_FCTL_PROTECTED))
return 0;
IWL_DEBUG_RX("decrypt_res:0x%x\n", decrypt_res);
switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
case RX_RES_STATUS_SEC_TYPE_TKIP:
/* The uCode has got a bad phase 1 Key, pushes the packet.
* Decryption will be done in SW. */
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
RX_RES_STATUS_BAD_KEY_TTAK)
break;
case RX_RES_STATUS_SEC_TYPE_WEP:
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
RX_RES_STATUS_BAD_ICV_MIC) {
/* bad ICV, the packet is destroyed since the
* decryption is inplace, drop it */
IWL_DEBUG_RX("Packet destroyed\n");
return -1;
}
case RX_RES_STATUS_SEC_TYPE_CCMP:
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
RX_RES_STATUS_DECRYPT_OK) {
IWL_DEBUG_RX("hw decrypt successfully!!!\n");
stats->flag |= RX_FLAG_DECRYPTED;
}
break;
default:
break;
}
return 0;
}
static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
{
u32 decrypt_out = 0;
if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
RX_RES_STATUS_STATION_FOUND)
decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
/* packet was not encrypted */
if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
RX_RES_STATUS_SEC_TYPE_NONE)
return decrypt_out;
/* packet was encrypted with unknown alg */
if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
RX_RES_STATUS_SEC_TYPE_ERR)
return decrypt_out;
/* decryption was not done in HW */
if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
RX_MPDU_RES_STATUS_DEC_DONE_MSK)
return decrypt_out;
switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
case RX_RES_STATUS_SEC_TYPE_CCMP:
/* alg is CCM: check MIC only */
if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
/* Bad MIC */
decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
else
decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
break;
case RX_RES_STATUS_SEC_TYPE_TKIP:
if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
/* Bad TTAK */
decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
break;
}
/* fall through if TTAK OK */
default:
if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
else
decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
break;
};
IWL_DEBUG_RX("decrypt_in:0x%x decrypt_out = 0x%x\n",
decrypt_in, decrypt_out);
return decrypt_out;
}
static void iwl_handle_data_packet(struct iwl_priv *priv, int is_data,
int include_phy,
struct iwl_rx_mem_buffer *rxb,
struct ieee80211_rx_status *stats)
{
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
(struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
struct ieee80211_hdr *hdr;
u16 len;
__le32 *rx_end;
unsigned int skblen;
u32 ampdu_status;
u32 ampdu_status_legacy;
if (!include_phy && priv->last_phy_res[0])
rx_start = (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
if (!rx_start) {
IWL_ERROR("MPDU frame without a PHY data\n");
return;
}
if (include_phy) {
hdr = (struct ieee80211_hdr *)((u8 *) &rx_start[1] +
rx_start->cfg_phy_cnt);
len = le16_to_cpu(rx_start->byte_count);
rx_end = (__le32 *) ((u8 *) &pkt->u.raw[0] +
sizeof(struct iwl4965_rx_phy_res) +
rx_start->cfg_phy_cnt + len);
} else {
struct iwl4965_rx_mpdu_res_start *amsdu =
(struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
hdr = (struct ieee80211_hdr *)(pkt->u.raw +
sizeof(struct iwl4965_rx_mpdu_res_start));
len = le16_to_cpu(amsdu->byte_count);
rx_start->byte_count = amsdu->byte_count;
rx_end = (__le32 *) (((u8 *) hdr) + len);
}
/* In monitor mode allow 802.11 ACk frames (10 bytes) */
if (len > priv->hw_params.max_pkt_size ||
len < ((priv->iw_mode == IEEE80211_IF_TYPE_MNTR) ? 10 : 16)) {
IWL_WARNING("byte count out of range [16,4K] : %d\n", len);
return;
}
ampdu_status = le32_to_cpu(*rx_end);
skblen = ((u8 *) rx_end - (u8 *) &pkt->u.raw[0]) + sizeof(u32);
if (!include_phy) {
/* New status scheme, need to translate */
ampdu_status_legacy = ampdu_status;
ampdu_status = iwl_translate_rx_status(priv, ampdu_status);
}
/* start from MAC */
skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
skb_put(rxb->skb, len); /* end where data ends */
/* We only process data packets if the interface is open */
if (unlikely(!priv->is_open)) {
IWL_DEBUG_DROP_LIMIT
("Dropping packet while interface is not open.\n");
return;
}
stats->flag = 0;
hdr = (struct ieee80211_hdr *)rxb->skb->data;
/* in case of HW accelerated crypto and bad decryption, drop */
if (!priv->hw_params.sw_crypto &&
iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
return;
if (priv->add_radiotap)
iwl_add_radiotap(priv, rxb->skb, rx_start, stats, ampdu_status);
iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
priv->alloc_rxb_skb--;
rxb->skb = NULL;
}
/* Calc max signal level (dBm) among 3 possible receivers */
static int iwl_calc_rssi(struct iwl_priv *priv,
struct iwl4965_rx_phy_res *rx_resp)
{
/* data from PHY/DSP regarding signal strength, etc.,
* contents are always there, not configurable by host. */
struct iwl4965_rx_non_cfg_phy *ncphy =
(struct iwl4965_rx_non_cfg_phy *)rx_resp->non_cfg_phy;
u32 agc = (le16_to_cpu(ncphy->agc_info) & IWL_AGC_DB_MASK)
>> IWL_AGC_DB_POS;
u32 valid_antennae =
(le16_to_cpu(rx_resp->phy_flags) & RX_PHY_FLAGS_ANTENNAE_MASK)
>> RX_PHY_FLAGS_ANTENNAE_OFFSET;
u8 max_rssi = 0;
u32 i;
/* Find max rssi among 3 possible receivers.
* These values are measured by the digital signal processor (DSP).
* They should stay fairly constant even as the signal strength varies,
* if the radio's automatic gain control (AGC) is working right.
* AGC value (see below) will provide the "interesting" info. */
for (i = 0; i < 3; i++)
if (valid_antennae & (1 << i))
max_rssi = max(ncphy->rssi_info[i << 1], max_rssi);
IWL_DEBUG_STATS("Rssi In A %d B %d C %d Max %d AGC dB %d\n",
ncphy->rssi_info[0], ncphy->rssi_info[2], ncphy->rssi_info[4],
max_rssi, agc);
/* dBm = max_rssi dB - agc dB - constant.
* Higher AGC (higher radio gain) means lower signal. */
return max_rssi - agc - IWL_RSSI_OFFSET;
}
static void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
{
unsigned long flags;
spin_lock_irqsave(&priv->sta_lock, flags);
priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
priv->stations[sta_id].sta.sta.modify_mask = 0;
priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
spin_unlock_irqrestore(&priv->sta_lock, flags);
iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
}
static void iwl_update_ps_mode(struct iwl_priv *priv, u16 ps_bit, u8 *addr)
{
/* FIXME: need locking over ps_status ??? */
u8 sta_id = iwl_find_station(priv, addr);
if (sta_id != IWL_INVALID_STATION) {
u8 sta_awake = priv->stations[sta_id].
ps_status == STA_PS_STATUS_WAKE;
if (sta_awake && ps_bit)
priv->stations[sta_id].ps_status = STA_PS_STATUS_SLEEP;
else if (!sta_awake && !ps_bit) {
iwl_sta_modify_ps_wake(priv, sta_id);
priv->stations[sta_id].ps_status = STA_PS_STATUS_WAKE;
}
}
}
#define IWL_PACKET_RETRY_TIME HZ
static int iwl_is_duplicate_packet(struct iwl_priv *priv,
struct ieee80211_hdr *header)
{
u16 sc = le16_to_cpu(header->seq_ctrl);
u16 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
u16 frag = sc & IEEE80211_SCTL_FRAG;
u16 *last_seq, *last_frag;
unsigned long *last_time;
switch (priv->iw_mode) {
case IEEE80211_IF_TYPE_IBSS:{
struct list_head *p;
struct iwl4965_ibss_seq *entry = NULL;
u8 *mac = header->addr2;
int index = mac[5] & (IWL_IBSS_MAC_HASH_SIZE - 1);
__list_for_each(p, &priv->ibss_mac_hash[index]) {
entry = list_entry(p, struct iwl4965_ibss_seq, list);
if (!compare_ether_addr(entry->mac, mac))
break;
}
if (p == &priv->ibss_mac_hash[index]) {
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (!entry) {
IWL_ERROR("Cannot malloc new mac entry\n");
return 0;
}
memcpy(entry->mac, mac, ETH_ALEN);
entry->seq_num = seq;
entry->frag_num = frag;
entry->packet_time = jiffies;
list_add(&entry->list, &priv->ibss_mac_hash[index]);
return 0;
}
last_seq = &entry->seq_num;
last_frag = &entry->frag_num;
last_time = &entry->packet_time;
break;
}
case IEEE80211_IF_TYPE_STA:
last_seq = &priv->last_seq_num;
last_frag = &priv->last_frag_num;
last_time = &priv->last_packet_time;
break;
default:
return 0;
}
if ((*last_seq == seq) &&
time_after(*last_time + IWL_PACKET_RETRY_TIME, jiffies)) {
if (*last_frag == frag)
goto drop;
if (*last_frag + 1 != frag)
/* out-of-order fragment */
goto drop;
} else
*last_seq = seq;
*last_frag = frag;
*last_time = jiffies;
return 0;
drop:
return 1;
}
static int iwl_is_network_packet(struct iwl_priv *priv,
struct ieee80211_hdr *header)
{
/* Filter incoming packets to determine if they are targeted toward
* this network, discarding packets coming from ourselves */
switch (priv->iw_mode) {
case IEEE80211_IF_TYPE_IBSS: /* Header: Dest. | Source | BSSID */
/* packets from our adapter are dropped (echo) */
if (!compare_ether_addr(header->addr2, priv->mac_addr))
return 0;
/* {broad,multi}cast packets to our IBSS go through */
if (is_multicast_ether_addr(header->addr1))
return !compare_ether_addr(header->addr3, priv->bssid);
/* packets to our adapter go through */
return !compare_ether_addr(header->addr1, priv->mac_addr);
case IEEE80211_IF_TYPE_STA: /* Header: Dest. | AP{BSSID} | Source */
/* packets from our adapter are dropped (echo) */
if (!compare_ether_addr(header->addr3, priv->mac_addr))
return 0;
/* {broad,multi}cast packets to our BSS go through */
if (is_multicast_ether_addr(header->addr1))
return !compare_ether_addr(header->addr2, priv->bssid);
/* packets to our adapter go through */
return !compare_ether_addr(header->addr1, priv->mac_addr);
default:
break;
}
return 1;
}
/* Called for REPLY_RX (legacy ABG frames), or
* REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
void iwl_rx_reply_rx(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct ieee80211_hdr *header;
struct ieee80211_rx_status rx_status;
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
/* Use phy data (Rx signal strength, etc.) contained within
* this rx packet for legacy frames,
* or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
int include_phy = (pkt->hdr.cmd == REPLY_RX);
struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
(struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) :
(struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
__le32 *rx_end;
unsigned int len = 0;
u16 fc;
u8 network_packet;
rx_status.mactime = le64_to_cpu(rx_start->timestamp);
rx_status.freq =
ieee80211_channel_to_frequency(le16_to_cpu(rx_start->channel));
rx_status.band = (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
rx_status.rate_idx =
iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start->rate_n_flags));
if (rx_status.band == IEEE80211_BAND_5GHZ)
rx_status.rate_idx -= IWL_FIRST_OFDM_RATE;
rx_status.antenna = 0;
rx_status.flag = 0;
if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
rx_start->cfg_phy_cnt);
return;
}
if (!include_phy) {
if (priv->last_phy_res[0])
rx_start = (struct iwl4965_rx_phy_res *)
&priv->last_phy_res[1];
else
rx_start = NULL;
}
if (!rx_start) {
IWL_ERROR("MPDU frame without a PHY data\n");
return;
}
if (include_phy) {
header = (struct ieee80211_hdr *)((u8 *) &rx_start[1]
+ rx_start->cfg_phy_cnt);
len = le16_to_cpu(rx_start->byte_count);
rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
sizeof(struct iwl4965_rx_phy_res) + len);
} else {
struct iwl4965_rx_mpdu_res_start *amsdu =
(struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
header = (void *)(pkt->u.raw +
sizeof(struct iwl4965_rx_mpdu_res_start));
len = le16_to_cpu(amsdu->byte_count);
rx_end = (__le32 *) (pkt->u.raw +
sizeof(struct iwl4965_rx_mpdu_res_start) + len);
}
if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
!(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
le32_to_cpu(*rx_end));
return;
}
priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);
/* Find max signal strength (dBm) among 3 antenna/receiver chains */
rx_status.signal = iwl_calc_rssi(priv, rx_start);
/* Meaningful noise values are available only from beacon statistics,
* which are gathered only when associated, and indicate noise
* only for the associated network channel ...
* Ignore these noise values while scanning (other channels) */
if (iwl_is_associated(priv) &&
!test_bit(STATUS_SCANNING, &priv->status)) {
rx_status.noise = priv->last_rx_noise;
rx_status.qual = iwl_calc_sig_qual(rx_status.signal,
rx_status.noise);
} else {
rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
rx_status.qual = iwl_calc_sig_qual(rx_status.signal, 0);
}
/* Reset beacon noise level if not associated. */
if (!iwl_is_associated(priv))
priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
/* Set "1" to report good data frames in groups of 100 */
/* FIXME: need to optimze the call: */
iwl_dbg_report_frame(priv, pkt, header, 1);
IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
rx_status.signal, rx_status.noise, rx_status.signal,
(unsigned long long)rx_status.mactime);
if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR) {
iwl_handle_data_packet(priv, 1, include_phy,
rxb, &rx_status);
return;
}
network_packet = iwl_is_network_packet(priv, header);
if (network_packet) {
priv->last_rx_rssi = rx_status.signal;
priv->last_beacon_time = priv->ucode_beacon_time;
priv->last_tsf = le64_to_cpu(rx_start->timestamp);
}
fc = le16_to_cpu(header->frame_control);
switch (fc & IEEE80211_FCTL_FTYPE) {
case IEEE80211_FTYPE_MGMT:
if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
iwl_update_ps_mode(priv, fc & IEEE80211_FCTL_PM,
header->addr2);
iwl_handle_data_packet(priv, 0, include_phy, rxb, &rx_status);
break;
case IEEE80211_FTYPE_CTL:
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_BACK_REQ:
IWL_DEBUG_HT("IEEE80211_STYPE_BACK_REQ arrived\n");
iwl_handle_data_packet(priv, 0, include_phy,
rxb, &rx_status);
break;
default:
break;
}
break;
case IEEE80211_FTYPE_DATA: {
DECLARE_MAC_BUF(mac1);
DECLARE_MAC_BUF(mac2);
DECLARE_MAC_BUF(mac3);
if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
iwl_update_ps_mode(priv, fc & IEEE80211_FCTL_PM,
header->addr2);
if (unlikely(!network_packet))
IWL_DEBUG_DROP("Dropping (non network): "
"%s, %s, %s\n",
print_mac(mac1, header->addr1),
print_mac(mac2, header->addr2),
print_mac(mac3, header->addr3));
else if (unlikely(iwl_is_duplicate_packet(priv, header)))
IWL_DEBUG_DROP("Dropping (dup): %s, %s, %s\n",
print_mac(mac1, header->addr1),
print_mac(mac2, header->addr2),
print_mac(mac3, header->addr3));
else
iwl_handle_data_packet(priv, 1, include_phy, rxb,
&rx_status);
break;
}
default:
break;
}
}
EXPORT_SYMBOL(iwl_rx_reply_rx);
/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
* This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
priv->last_phy_res[0] = 1;
memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
sizeof(struct iwl4965_rx_phy_res));
}
EXPORT_SYMBOL(iwl_rx_reply_rx_phy);

152
drivers/net/wireless/iwlwifi/iwl4965-base.c
View File

@ -613,36 +613,6 @@ static void iwl4965_activate_qos(struct iwl_priv *priv, u8 force)
} }
} }
int iwl4965_is_network_packet(struct iwl_priv *priv, struct ieee80211_hdr *header)
{
/* Filter incoming packets to determine if they are targeted toward
* this network, discarding packets coming from ourselves */
switch (priv->iw_mode) {
case IEEE80211_IF_TYPE_IBSS: /* Header: Dest. | Source | BSSID */
/* packets from our adapter are dropped (echo) */
if (!compare_ether_addr(header->addr2, priv->mac_addr))
return 0;
/* {broad,multi}cast packets to our IBSS go through */
if (is_multicast_ether_addr(header->addr1))
return !compare_ether_addr(header->addr3, priv->bssid);
/* packets to our adapter go through */
return !compare_ether_addr(header->addr1, priv->mac_addr);
case IEEE80211_IF_TYPE_STA: /* Header: Dest. | AP{BSSID} | Source */
/* packets from our adapter are dropped (echo) */
if (!compare_ether_addr(header->addr3, priv->mac_addr))
return 0;
/* {broad,multi}cast packets to our BSS go through */
if (is_multicast_ether_addr(header->addr1))
return !compare_ether_addr(header->addr2, priv->bssid);
/* packets to our adapter go through */
return !compare_ether_addr(header->addr1, priv->mac_addr);
default:
break;
}
return 1;
}
static void iwl4965_sequence_reset(struct iwl_priv *priv) static void iwl4965_sequence_reset(struct iwl_priv *priv)
{ {
/* Reset ieee stats */ /* Reset ieee stats */
@ -906,72 +876,6 @@ static void iwl4965_set_rate(struct iwl_priv *priv)
(IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF; (IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
} }
#define IWL_PACKET_RETRY_TIME HZ
int iwl4965_is_duplicate_packet(struct iwl_priv *priv, struct ieee80211_hdr *header)
{
u16 sc = le16_to_cpu(header->seq_ctrl);
u16 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
u16 frag = sc & IEEE80211_SCTL_FRAG;
u16 *last_seq, *last_frag;
unsigned long *last_time;
switch (priv->iw_mode) {
case IEEE80211_IF_TYPE_IBSS:{
struct list_head *p;
struct iwl4965_ibss_seq *entry = NULL;
u8 *mac = header->addr2;
int index = mac[5] & (IWL_IBSS_MAC_HASH_SIZE - 1);
__list_for_each(p, &priv->ibss_mac_hash[index]) {
entry = list_entry(p, struct iwl4965_ibss_seq, list);
if (!compare_ether_addr(entry->mac, mac))
break;
}
if (p == &priv->ibss_mac_hash[index]) {
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (!entry) {
IWL_ERROR("Cannot malloc new mac entry\n");
return 0;
}
memcpy(entry->mac, mac, ETH_ALEN);
entry->seq_num = seq;
entry->frag_num = frag;
entry->packet_time = jiffies;
list_add(&entry->list, &priv->ibss_mac_hash[index]);
return 0;
}
last_seq = &entry->seq_num;
last_frag = &entry->frag_num;
last_time = &entry->packet_time;
break;
}
case IEEE80211_IF_TYPE_STA:
last_seq = &priv->last_seq_num;
last_frag = &priv->last_frag_num;
last_time = &priv->last_packet_time;
break;
default:
return 0;
}
if ((*last_seq == seq) &&
time_after(*last_time + IWL_PACKET_RETRY_TIME, jiffies)) {
if (*last_frag == frag)
goto drop;
if (*last_frag + 1 != frag)
/* out-of-order fragment */
goto drop;
} else
*last_seq = seq;
*last_frag = frag;
*last_time = jiffies;
return 0;
drop:
return 1;
}
#ifdef CONFIG_IWL4965_SPECTRUM_MEASUREMENT #ifdef CONFIG_IWL4965_SPECTRUM_MEASUREMENT
#include "iwl-spectrum.h" #include "iwl-spectrum.h"
@ -1350,17 +1254,6 @@ static void iwl4965_rx_card_state_notif(struct iwl_priv *priv,
wake_up_interruptible(&priv->wait_command_queue); wake_up_interruptible(&priv->wait_command_queue);
} }
/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
* This will be used later in iwl4965_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
static void iwl4965_rx_reply_rx_phy(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
priv->last_phy_res[0] = 1;
memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
sizeof(struct iwl4965_rx_phy_res));
}
/** /**
* iwl4965_setup_rx_handlers - Initialize Rx handler callbacks * iwl4965_setup_rx_handlers - Initialize Rx handler callbacks
* *
@ -1398,8 +1291,8 @@ static void iwl4965_setup_rx_handlers(struct iwl_priv *priv)
priv->rx_handlers[MISSED_BEACONS_NOTIFICATION] = priv->rx_handlers[MISSED_BEACONS_NOTIFICATION] =
iwl_rx_missed_beacon_notif; iwl_rx_missed_beacon_notif;
/* Rx handlers */ /* Rx handlers */
priv->rx_handlers[REPLY_RX_PHY_CMD] = iwl4965_rx_reply_rx_phy; priv->rx_handlers[REPLY_RX_PHY_CMD] = iwl_rx_reply_rx_phy;
priv->rx_handlers[REPLY_RX_MPDU_CMD] = iwl4965_rx_reply_rx; priv->rx_handlers[REPLY_RX_MPDU_CMD] = iwl_rx_reply_rx;
/* Set up hardware specific Rx handlers */ /* Set up hardware specific Rx handlers */
priv->cfg->ops->lib->rx_handler_setup(priv); priv->cfg->ops->lib->rx_handler_setup(priv);
} }
@ -1530,47 +1423,6 @@ void iwl_rx_handle(struct iwl_priv *priv)
iwl_rx_queue_restock(priv); iwl_rx_queue_restock(priv);
} }
#define PERFECT_RSSI (-20) /* dBm */
#define WORST_RSSI (-95) /* dBm */
#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
/* Calculate an indication of rx signal quality (a percentage, not dBm!).
* See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
* about formulas used below. */
int iwl4965_calc_sig_qual(int rssi_dbm, int noise_dbm)
{
int sig_qual;
int degradation = PERFECT_RSSI - rssi_dbm;
/* If we get a noise measurement, use signal-to-noise ratio (SNR)
* as indicator; formula is (signal dbm - noise dbm).
* SNR at or above 40 is a great signal (100%).
* Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
* Weakest usable signal is usually 10 - 15 dB SNR. */
if (noise_dbm) {
if (rssi_dbm - noise_dbm >= 40)
return 100;
else if (rssi_dbm < noise_dbm)
return 0;
sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
/* Else use just the signal level.
* This formula is a least squares fit of data points collected and
* compared with a reference system that had a percentage (%) display
* for signal quality. */
} else
sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
(15 * RSSI_RANGE + 62 * degradation)) /
(RSSI_RANGE * RSSI_RANGE);
if (sig_qual > 100)
sig_qual = 100;
else if (sig_qual < 1)
sig_qual = 0;
return sig_qual;
}
#ifdef CONFIG_IWLWIFI_DEBUG #ifdef CONFIG_IWLWIFI_DEBUG
static void iwl4965_print_rx_config_cmd(struct iwl_priv *priv) static void iwl4965_print_rx_config_cmd(struct iwl_priv *priv)
{ {