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iwlwifi: improve scan support 

This modifies iwlwifi to
 * no longer build its own probe request, but use mac80211's
 * therefore, support arbitrary scan IEs (up to the max len)
 * support multiple scan SSIDs
 * support passive scanning

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-04-20 14:36:56 -07:00 committed by John W. Linville
parent 9b3bf06aba
commit 1ecf9fc131
6 changed files with 73 additions and 177 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/iwlwifi/iwl-commands.h
View File

@ -2474,6 +2474,7 @@ struct iwl_ssid_ie {
#define TX_CMD_LIFE_TIME_INFINITE cpu_to_le32(0xFFFFFFFF)
#define IWL_GOOD_CRC_TH cpu_to_le16(1)
#define IWL_MAX_SCAN_SIZE 1024
#define IWL_MAX_PROBE_REQUEST 200
/*
* REPLY_SCAN_CMD = 0x80 (command)

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

@ -1309,8 +1309,10 @@ int iwl_setup_mac(struct iwl_priv *priv)
BIT(NL80211_IFTYPE_ADHOC);
hw->wiphy->custom_regulatory = true;
hw->wiphy->max_scan_ssids = 1;
hw->wiphy->max_scan_ie_len = 0; /* XXX for now */
hw->wiphy->max_scan_ssids = PROBE_OPTION_MAX;
/* we create the 802.11 header and a zero-length SSID element */
hw->wiphy->max_scan_ie_len = IWL_MAX_PROBE_REQUEST - 24 - 2;
/* Default value; 4 EDCA QOS priorities */
hw->queues = 4;

4
drivers/net/wireless/iwlwifi/iwl-core.h
View File

@ -396,8 +396,8 @@ int iwl_scan_cancel(struct iwl_priv *priv);
int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms);
int iwl_scan_initiate(struct iwl_priv *priv);
int iwl_mac_hw_scan(struct ieee80211_hw *hw, struct cfg80211_scan_request *req);
u16 iwl_fill_probe_req(struct iwl_priv *priv, enum ieee80211_band band,
struct ieee80211_mgmt *frame, int left);
u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
const u8 *ie, int ie_len, int left);
void iwl_setup_rx_scan_handlers(struct iwl_priv *priv);
u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
enum ieee80211_band band,

4
drivers/net/wireless/iwlwifi/iwl-dev.h
View File

@ -889,9 +889,7 @@ struct iwl_priv {
unsigned long scan_start_tsf;
void *scan;
int scan_bands;
int one_direct_scan;
u8 direct_ssid_len;
u8 direct_ssid[IW_ESSID_MAX_SIZE];
struct cfg80211_scan_request *scan_request;
u8 scan_tx_ant[IEEE80211_NUM_BANDS];
u8 mgmt_tx_ant;

187
drivers/net/wireless/iwlwifi/iwl-scan.c
View File

@ -448,13 +448,6 @@ int iwl_mac_hw_scan(struct ieee80211_hw *hw,
unsigned long flags;
struct iwl_priv *priv = hw->priv;
int ret;
u8 *ssid = NULL;
size_t ssid_len = 0;
if (req->n_ssids) {
ssid = req->ssids[0].ssid;
ssid_len = req->ssids[0].ssid_len;
}
IWL_DEBUG_MAC80211(priv, "enter\n");
@ -488,13 +481,7 @@ int iwl_mac_hw_scan(struct ieee80211_hw *hw,
goto out_unlock;
}
if (ssid_len) {
priv->one_direct_scan = 1;
priv->direct_ssid_len = ssid_len;
memcpy(priv->direct_ssid, ssid, priv->direct_ssid_len);
} else {
priv->one_direct_scan = 0;
}
priv->scan_request = req;
ret = iwl_scan_initiate(priv);
@ -532,74 +519,15 @@ void iwl_bg_scan_check(struct work_struct *data)
}
EXPORT_SYMBOL(iwl_bg_scan_check);
/**
* iwl_supported_rate_to_ie - fill in the supported rate in IE field
*
* return : set the bit for each supported rate insert in ie
*/
static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
u16 basic_rate, int *left)
{
u16 ret_rates = 0, bit;
int i;
u8 *cnt = ie;
u8 *rates = ie + 1;
for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
if (bit & supported_rate) {
ret_rates |= bit;
rates[*cnt] = iwl_rates[i].ieee |
((bit & basic_rate) ? 0x80 : 0x00);
(*cnt)++;
(*left)--;
if ((*left <= 0) ||
(*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
break;
}
}
return ret_rates;
}
static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
u8 *pos, int *left)
{
struct ieee80211_ht_cap *ht_cap;
if (!sband || !sband->ht_cap.ht_supported)
return;
if (*left < sizeof(struct ieee80211_ht_cap))
return;
*pos++ = sizeof(struct ieee80211_ht_cap);
ht_cap = (struct ieee80211_ht_cap *) pos;
ht_cap->cap_info = cpu_to_le16(sband->ht_cap.cap);
memcpy(&ht_cap->mcs, &sband->ht_cap.mcs, 16);
ht_cap->ampdu_params_info =
(sband->ht_cap.ampdu_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) |
((sband->ht_cap.ampdu_density << 2) &
IEEE80211_HT_AMPDU_PARM_DENSITY);
*left -= sizeof(struct ieee80211_ht_cap);
}
/**
* iwl_fill_probe_req - fill in all required fields and IE for probe request
*/
u16 iwl_fill_probe_req(struct iwl_priv *priv,
enum ieee80211_band band,
struct ieee80211_mgmt *frame,
int left)
u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
const u8 *ies, int ie_len, int left)
{
int len = 0;
u8 *pos = NULL;
u16 active_rates, ret_rates, cck_rates, active_rate_basic;
const struct ieee80211_supported_band *sband =
iwl_get_hw_mode(priv, band);
/* Make sure there is enough space for the probe request,
* two mandatory IEs and the data */
@ -627,62 +555,12 @@ u16 iwl_fill_probe_req(struct iwl_priv *priv,
len += 2;
/* fill in supported rate */
left -= 2;
if (left < 0)
return 0;
if (WARN_ON(left < ie_len))
return len;
*pos++ = WLAN_EID_SUPP_RATES;
*pos = 0;
/* exclude 60M rate */
active_rates = priv->rates_mask;
active_rates &= ~IWL_RATE_60M_MASK;
active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
cck_rates = IWL_CCK_RATES_MASK & active_rates;
ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
active_rate_basic, &left);
active_rates &= ~ret_rates;
ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
active_rate_basic, &left);
active_rates &= ~ret_rates;
len += 2 + *pos;
pos += (*pos) + 1;
if (active_rates == 0)
goto fill_end;
/* fill in supported extended rate */
/* ...next IE... */
left -= 2;
if (left < 0)
return 0;
/* ... fill it in... */
*pos++ = WLAN_EID_EXT_SUPP_RATES;
*pos = 0;
iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
if (*pos > 0) {
len += 2 + *pos;
pos += (*pos) + 1;
} else {
pos--;
}
fill_end:
left -= 2;
if (left < 0)
return 0;
*pos++ = WLAN_EID_HT_CAPABILITY;
*pos = 0;
iwl_ht_cap_to_ie(sband, pos, &left);
if (*pos > 0)
len += 2 + *pos;
memcpy(pos, ies, ie_len);
len += ie_len;
left -= ie_len;
return (u16)len;
}
@ -703,10 +581,10 @@ static void iwl_bg_request_scan(struct work_struct *data)
u32 rate_flags = 0;
u16 cmd_len;
enum ieee80211_band band;
u8 n_probes = 2;
u8 n_probes = 0;
u8 rx_chain = priv->hw_params.valid_rx_ant;
u8 rate;
DECLARE_SSID_BUF(ssid);
bool is_active = false;
conf = ieee80211_get_hw_conf(priv->hw);
@ -796,19 +674,25 @@ static void iwl_bg_request_scan(struct work_struct *data)
scan_suspend_time, interval);
}
/* We should add the ability for user to lock to PASSIVE ONLY */
if (priv->one_direct_scan) {
IWL_DEBUG_SCAN(priv, "Start direct scan for '%s'\n",
print_ssid(ssid, priv->direct_ssid,
priv->direct_ssid_len));
scan->direct_scan[0].id = WLAN_EID_SSID;
scan->direct_scan[0].len = priv->direct_ssid_len;
memcpy(scan->direct_scan[0].ssid,
priv->direct_ssid, priv->direct_ssid_len);
n_probes++;
} else {
IWL_DEBUG_SCAN(priv, "Start indirect scan.\n");
}
if (priv->scan_request->n_ssids) {
int i, p = 0;
IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
for (i = 0; i < priv->scan_request->n_ssids; i++) {
/* always does wildcard anyway */
if (!priv->scan_request->ssids[i].ssid_len)
continue;
scan->direct_scan[p].id = WLAN_EID_SSID;
scan->direct_scan[p].len =
priv->scan_request->ssids[i].ssid_len;
memcpy(scan->direct_scan[p].ssid,
priv->scan_request->ssids[i].ssid,
priv->scan_request->ssids[i].ssid_len);
n_probes++;
p++;
}
is_active = true;
} else
IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
@ -850,10 +734,11 @@ static void iwl_bg_request_scan(struct work_struct *data)
cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
(rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
(0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
cmd_len = iwl_fill_probe_req(priv, band,
(struct ieee80211_mgmt *)scan->data,
IWL_MAX_SCAN_SIZE - sizeof(*scan));
cmd_len = iwl_fill_probe_req(priv,
(struct ieee80211_mgmt *)scan->data,
priv->scan_request->ie,
priv->scan_request->ie_len,
IWL_MAX_SCAN_SIZE - sizeof(*scan));
scan->tx_cmd.len = cpu_to_le16(cmd_len);
@ -864,8 +749,7 @@ static void iwl_bg_request_scan(struct work_struct *data)
RXON_FILTER_BCON_AWARE_MSK);
scan->channel_count =
iwl_get_channels_for_scan(priv, band, 1, /* active */
n_probes,
iwl_get_channels_for_scan(priv, band, is_active, n_probes,
(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
if (scan->channel_count == 0) {
@ -928,6 +812,7 @@ void iwl_bg_scan_completed(struct work_struct *work)
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
priv->scan_request = NULL;
ieee80211_scan_completed(priv->hw, false);
/* Since setting the TXPOWER may have been deferred while

48
drivers/net/wireless/iwlwifi/iwl3945-base.c
View File

@ -2942,9 +2942,9 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
int rc = 0;
struct iwl3945_scan_cmd *scan;
struct ieee80211_conf *conf = NULL;
u8 n_probes = 2;
u8 n_probes = 0;
enum ieee80211_band band;
DECLARE_SSID_BUF(ssid);
bool is_active = false;
conf = ieee80211_get_hw_conf(priv->hw);
@ -3043,18 +3043,25 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
scan_suspend_time, interval);
}
/* We should add the ability for user to lock to PASSIVE ONLY */
if (priv->one_direct_scan) {
IWL_DEBUG_SCAN(priv, "Kicking off one direct scan for '%s'\n",
print_ssid(ssid, priv->direct_ssid,
priv->direct_ssid_len));
scan->direct_scan[0].id = WLAN_EID_SSID;
scan->direct_scan[0].len = priv->direct_ssid_len;
memcpy(scan->direct_scan[0].ssid,
priv->direct_ssid, priv->direct_ssid_len);
n_probes++;
if (priv->scan_request->n_ssids) {
int i, p = 0;
IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
for (i = 0; i < priv->scan_request->n_ssids; i++) {
/* always does wildcard anyway */
if (!priv->scan_request->ssids[i].ssid_len)
continue;
scan->direct_scan[p].id = WLAN_EID_SSID;
scan->direct_scan[p].len =
priv->scan_request->ssids[i].ssid_len;
memcpy(scan->direct_scan[p].ssid,
priv->scan_request->ssids[i].ssid,
priv->scan_request->ssids[i].ssid_len);
n_probes++;
p++;
}
is_active = true;
} else
IWL_DEBUG_SCAN(priv, "Kicking off one indirect scan.\n");
IWL_DEBUG_SCAN(priv, "Kicking off passive scan.\n");
/* We don't build a direct scan probe request; the uCode will do
* that based on the direct_mask added to each channel entry */
@ -3079,9 +3086,11 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
}
scan->tx_cmd.len = cpu_to_le16(
iwl_fill_probe_req(priv, band,
(struct ieee80211_mgmt *)scan->data,
IWL_MAX_SCAN_SIZE - sizeof(*scan)));
iwl_fill_probe_req(priv,
(struct ieee80211_mgmt *)scan->data,
priv->scan_request->ie,
priv->scan_request->ie_len,
IWL_MAX_SCAN_SIZE - sizeof(*scan)));
/* select Rx antennas */
scan->flags |= iwl3945_get_antenna_flags(priv);
@ -3090,8 +3099,7 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
scan->filter_flags = RXON_FILTER_PROMISC_MSK;
scan->channel_count =
iwl3945_get_channels_for_scan(priv, band, 1, /* active */
n_probes,
iwl3945_get_channels_for_scan(priv, band, is_active, n_probes,
(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
if (scan->channel_count == 0) {
@ -4119,7 +4127,9 @@ static int iwl3945_setup_mac(struct iwl_priv *priv)
hw->wiphy->custom_regulatory = true;
hw->wiphy->max_scan_ssids = 1; /* WILL FIX */
hw->wiphy->max_scan_ssids = PROBE_OPTION_MAX_3945;
/* we create the 802.11 header and a zero-length SSID element */
hw->wiphy->max_scan_ie_len = IWL_MAX_PROBE_REQUEST - 24 - 2;
/* Default value; 4 EDCA QOS priorities */
hw->queues = 4;