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iwl3945: enable active scanning on active channels

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This patch enables active scanning on active channels.

Signed-off-by: Abhijeet Kolekar <abhijeet.kolekar@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:
Abhijeet Kolekar 2008-09-03 11:26:58 +08:00 committed by John W. Linville
parent 05ecc2c103
commit f934052065
1 changed files with 26 additions and 28 deletions
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54
drivers/net/wireless/iwlwifi/iwl3945-base.c
View file

@ -4782,8 +4782,11 @@ static void iwl3945_free_channel_map(struct iwl3945_priv *priv)
/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
* sending probe req. This should be set long enough to hear probe responses
* from more than one AP. */
#define IWL_ACTIVE_DWELL_TIME_24 (20) /* all times in msec */
#define IWL_ACTIVE_DWELL_TIME_52 (10)
#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
#define IWL_ACTIVE_DWELL_TIME_52 (20)
#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
/* For faster active scanning, scan will move to the next channel if fewer than
* PLCP_QUIET_THRESH packets are heard on this channel within
@ -4792,7 +4795,7 @@ static void iwl3945_free_channel_map(struct iwl3945_priv *priv)
* no other traffic).
* Disable "quiet" feature by setting PLCP_QUIET_THRESH to 0. */
#define IWL_PLCP_QUIET_THRESH __constant_cpu_to_le16(1) /* packets */
#define IWL_ACTIVE_QUIET_TIME __constant_cpu_to_le16(5) /* msec */
#define IWL_ACTIVE_QUIET_TIME __constant_cpu_to_le16(10) /* msec */
/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
* Must be set longer than active dwell time.
@ -4802,13 +4805,18 @@ static void iwl3945_free_channel_map(struct iwl3945_priv *priv)
#define IWL_PASSIVE_DWELL_BASE (100)
#define IWL_CHANNEL_TUNE_TIME 5
#define IWL_SCAN_PROBE_MASK(n) cpu_to_le32((BIT(n) | (BIT(n) - BIT(1))))
static inline u16 iwl3945_get_active_dwell_time(struct iwl3945_priv *priv,
enum ieee80211_band band)
enum ieee80211_band band,
u8 n_probes)
{
if (band == IEEE80211_BAND_5GHZ)
return IWL_ACTIVE_DWELL_TIME_52;
return IWL_ACTIVE_DWELL_TIME_52 +
IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
else
return IWL_ACTIVE_DWELL_TIME_24;
return IWL_ACTIVE_DWELL_TIME_24 +
IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
}
static u16 iwl3945_get_passive_dwell_time(struct iwl3945_priv *priv,
@ -4833,7 +4841,7 @@ static u16 iwl3945_get_passive_dwell_time(struct iwl3945_priv *priv,
static int iwl3945_get_channels_for_scan(struct iwl3945_priv *priv,
enum ieee80211_band band,
u8 is_active, u8 direct_mask,
u8 is_active, u8 n_probes,
struct iwl3945_scan_channel *scan_ch)
{
const struct ieee80211_channel *channels = NULL;
@ -4849,7 +4857,7 @@ static int iwl3945_get_channels_for_scan(struct iwl3945_priv *priv,
channels = sband->channels;
active_dwell = iwl3945_get_active_dwell_time(priv, band);
active_dwell = iwl3945_get_active_dwell_time(priv, band, n_probes);
passive_dwell = iwl3945_get_passive_dwell_time(priv, band);
if (passive_dwell <= active_dwell)
@ -4874,8 +4882,8 @@ static int iwl3945_get_channels_for_scan(struct iwl3945_priv *priv,
else
scan_ch->type = 1; /* active */
if (scan_ch->type & 1)
scan_ch->type |= (direct_mask << 1);
if ((scan_ch->type & 1) && n_probes)
scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
scan_ch->active_dwell = cpu_to_le16(active_dwell);
scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
@ -6092,7 +6100,7 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
int rc = 0;
struct iwl3945_scan_cmd *scan;
struct ieee80211_conf *conf = NULL;
u8 direct_mask;
u8 n_probes = 2;
enum ieee80211_band band;
conf = ieee80211_get_hw_conf(priv->hw);
@ -6200,7 +6208,7 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
scan->direct_scan[0].len = priv->direct_ssid_len;
memcpy(scan->direct_scan[0].ssid,
priv->direct_ssid, priv->direct_ssid_len);
direct_mask = 1;
n_probes++;
} else if (!iwl3945_is_associated(priv) && priv->essid_len) {
IWL_DEBUG_SCAN
("Kicking off one direct scan for '%s' when not associated\n",
@ -6208,11 +6216,9 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
scan->direct_scan[0].id = WLAN_EID_SSID;
scan->direct_scan[0].len = priv->essid_len;
memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len);
direct_mask = 1;
} else {
n_probes++;
} else
IWL_DEBUG_SCAN("Kicking off one indirect scan.\n");
direct_mask = 0;
}
/* We don't build a direct scan probe request; the uCode will do
* that based on the direct_mask added to each channel entry */
@ -6245,18 +6251,10 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR)
scan->filter_flags = RXON_FILTER_PROMISC_MSK;
if (direct_mask)
scan->channel_count =
iwl3945_get_channels_for_scan(
priv, band, 1, /* active */
direct_mask,
(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
else
scan->channel_count =
iwl3945_get_channels_for_scan(
priv, band, 0, /* passive */
direct_mask,
(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
scan->channel_count =
iwl3945_get_channels_for_scan(priv, band, 1, /* active */
n_probes,
(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
cmd.len += le16_to_cpu(scan->tx_cmd.len) +
scan->channel_count * sizeof(struct iwl3945_scan_channel);