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author | Johannes Berg <johannes.berg@intel.com> | 2010-04-06 04:12:42 -0700 |
---|---|---|
committer | Reinette Chatre <reinette.chatre@intel.com> | 2010-04-16 13:47:37 -0700 |
commit | b6e4c55aaee4fd40526a6816e60c68dd62e565c4 (patch) | |
tree | 64bbff3fc159290e41173d0a227375eafe941943 /drivers/net/wireless/iwlwifi/iwl-agn-lib.c | |
parent | 811ecc995b18eb58067ffa75b961ece3b84a1f03 (diff) | |
download | kernel_samsung_smdk4412-b6e4c55aaee4fd40526a6816e60c68dd62e565c4.zip kernel_samsung_smdk4412-b6e4c55aaee4fd40526a6816e60c68dd62e565c4.tar.gz kernel_samsung_smdk4412-b6e4c55aaee4fd40526a6816e60c68dd62e565c4.tar.bz2 |
iwlwifi: trigger scan synchronously
Scan requesting doesn't need to be asynchronous
since all code paths leading up to it can sleep.
Make the scan request a new util operation that
is hw-specific (to account for 3945 vs. agn)
and call it right in place.
This patch moves a lot of code into iwlagn as
it need not be in iwlcore.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-agn-lib.c')
-rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-agn-lib.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c index c465c85..048c615 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c @@ -1111,3 +1111,398 @@ void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv, memcpy(&priv->_agn.last_phy_res, pkt->u.raw, sizeof(struct iwl_rx_phy_res)); } + +static int iwl_get_single_channel_for_scan(struct iwl_priv *priv, + enum ieee80211_band band, + struct iwl_scan_channel *scan_ch) +{ + const struct ieee80211_supported_band *sband; + const struct iwl_channel_info *ch_info; + u16 passive_dwell = 0; + u16 active_dwell = 0; + int i, added = 0; + u16 channel = 0; + + sband = iwl_get_hw_mode(priv, band); + if (!sband) { + IWL_ERR(priv, "invalid band\n"); + return added; + } + + active_dwell = iwl_get_active_dwell_time(priv, band, 0); + passive_dwell = iwl_get_passive_dwell_time(priv, band); + + if (passive_dwell <= active_dwell) + passive_dwell = active_dwell + 1; + + /* only scan single channel, good enough to reset the RF */ + /* pick the first valid not in-use channel */ + if (band == IEEE80211_BAND_5GHZ) { + for (i = 14; i < priv->channel_count; i++) { + if (priv->channel_info[i].channel != + le16_to_cpu(priv->staging_rxon.channel)) { + channel = priv->channel_info[i].channel; + ch_info = iwl_get_channel_info(priv, + band, channel); + if (is_channel_valid(ch_info)) + break; + } + } + } else { + for (i = 0; i < 14; i++) { + if (priv->channel_info[i].channel != + le16_to_cpu(priv->staging_rxon.channel)) { + channel = + priv->channel_info[i].channel; + ch_info = iwl_get_channel_info(priv, + band, channel); + if (is_channel_valid(ch_info)) + break; + } + } + } + if (channel) { + scan_ch->channel = cpu_to_le16(channel); + scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; + scan_ch->active_dwell = cpu_to_le16(active_dwell); + scan_ch->passive_dwell = cpu_to_le16(passive_dwell); + /* Set txpower levels to defaults */ + scan_ch->dsp_atten = 110; + if (band == IEEE80211_BAND_5GHZ) + scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; + else + scan_ch->tx_gain = ((1 << 5) | (5 << 3)); + added++; + } else + IWL_ERR(priv, "no valid channel found\n"); + return added; +} + +static int iwl_get_channels_for_scan(struct iwl_priv *priv, + enum ieee80211_band band, + u8 is_active, u8 n_probes, + struct iwl_scan_channel *scan_ch) +{ + struct ieee80211_channel *chan; + const struct ieee80211_supported_band *sband; + const struct iwl_channel_info *ch_info; + u16 passive_dwell = 0; + u16 active_dwell = 0; + int added, i; + u16 channel; + + sband = iwl_get_hw_mode(priv, band); + if (!sband) + return 0; + + active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); + passive_dwell = iwl_get_passive_dwell_time(priv, band); + + if (passive_dwell <= active_dwell) + passive_dwell = active_dwell + 1; + + for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { + chan = priv->scan_request->channels[i]; + + if (chan->band != band) + continue; + + channel = ieee80211_frequency_to_channel(chan->center_freq); + scan_ch->channel = cpu_to_le16(channel); + + ch_info = iwl_get_channel_info(priv, band, channel); + if (!is_channel_valid(ch_info)) { + IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n", + channel); + continue; + } + + if (!is_active || is_channel_passive(ch_info) || + (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)) + scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; + else + scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; + + if (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); + + /* Set txpower levels to defaults */ + scan_ch->dsp_atten = 110; + + /* NOTE: if we were doing 6Mb OFDM for scans we'd use + * power level: + * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; + */ + if (band == IEEE80211_BAND_5GHZ) + scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; + else + scan_ch->tx_gain = ((1 << 5) | (5 << 3)); + + IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", + channel, le32_to_cpu(scan_ch->type), + (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? + "ACTIVE" : "PASSIVE", + (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? + active_dwell : passive_dwell); + + scan_ch++; + added++; + } + + IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added); + return added; +} + +void iwlagn_request_scan(struct iwl_priv *priv) +{ + struct iwl_host_cmd cmd = { + .id = REPLY_SCAN_CMD, + .len = sizeof(struct iwl_scan_cmd), + .flags = CMD_SIZE_HUGE, + }; + struct iwl_scan_cmd *scan; + struct ieee80211_conf *conf = NULL; + u32 rate_flags = 0; + u16 cmd_len; + u16 rx_chain = 0; + enum ieee80211_band band; + u8 n_probes = 0; + u8 rx_ant = priv->hw_params.valid_rx_ant; + u8 rate; + bool is_active = false; + int chan_mod; + u8 active_chains; + + conf = ieee80211_get_hw_conf(priv->hw); + + cancel_delayed_work(&priv->scan_check); + + if (!iwl_is_ready(priv)) { + IWL_WARN(priv, "request scan called when driver not ready.\n"); + goto done; + } + + /* Make sure the scan wasn't canceled before this queued work + * was given the chance to run... */ + if (!test_bit(STATUS_SCANNING, &priv->status)) + goto done; + + /* This should never be called or scheduled if there is currently + * a scan active in the hardware. */ + if (test_bit(STATUS_SCAN_HW, &priv->status)) { + IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. " + "Ignoring second request.\n"); + goto done; + } + + if (test_bit(STATUS_EXIT_PENDING, &priv->status)) { + IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n"); + goto done; + } + + if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { + IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n"); + goto done; + } + + if (iwl_is_rfkill(priv)) { + IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n"); + goto done; + } + + if (!test_bit(STATUS_READY, &priv->status)) { + IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n"); + goto done; + } + + if (!priv->scan_cmd) { + priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) + + IWL_MAX_SCAN_SIZE, GFP_KERNEL); + if (!priv->scan_cmd) { + IWL_DEBUG_SCAN(priv, + "fail to allocate memory for scan\n"); + goto done; + } + } + scan = priv->scan_cmd; + memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); + + scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; + scan->quiet_time = IWL_ACTIVE_QUIET_TIME; + + if (iwl_is_associated(priv)) { + u16 interval = 0; + u32 extra; + u32 suspend_time = 100; + u32 scan_suspend_time = 100; + unsigned long flags; + + IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); + spin_lock_irqsave(&priv->lock, flags); + interval = priv->beacon_int; + spin_unlock_irqrestore(&priv->lock, flags); + + scan->suspend_time = 0; + scan->max_out_time = cpu_to_le32(200 * 1024); + if (!interval) + interval = suspend_time; + + extra = (suspend_time / interval) << 22; + scan_suspend_time = (extra | + ((suspend_time % interval) * 1024)); + scan->suspend_time = cpu_to_le32(scan_suspend_time); + IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", + scan_suspend_time, interval); + } + + if (priv->is_internal_short_scan) { + IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n"); + } else 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; + scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; + + switch (priv->scan_band) { + case IEEE80211_BAND_2GHZ: + scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; + chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK) + >> RXON_FLG_CHANNEL_MODE_POS; + if (chan_mod == CHANNEL_MODE_PURE_40) { + rate = IWL_RATE_6M_PLCP; + } else { + rate = IWL_RATE_1M_PLCP; + rate_flags = RATE_MCS_CCK_MSK; + } + scan->good_CRC_th = 0; + break; + case IEEE80211_BAND_5GHZ: + rate = IWL_RATE_6M_PLCP; + /* + * If active scaning is requested but a certain channel + * is marked passive, we can do active scanning if we + * detect transmissions. + */ + scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0; + + /* Force use of chains B and C (0x6) for scan Rx + * Avoid A (0x1) for the device has off-channel reception + * on A-band. + */ + if (priv->cfg->off_channel_workaround) + rx_ant = ANT_BC; + break; + default: + IWL_WARN(priv, "Invalid scan band count\n"); + goto done; + } + + band = priv->scan_band; + + priv->scan_tx_ant[band] = + iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]); + rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); + scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); + + /* In power save mode use one chain, otherwise use all chains */ + if (test_bit(STATUS_POWER_PMI, &priv->status)) { + /* rx_ant has been set to all valid chains previously */ + active_chains = rx_ant & + ((u8)(priv->chain_noise_data.active_chains)); + if (!active_chains) + active_chains = rx_ant; + + IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", + priv->chain_noise_data.active_chains); + + rx_ant = first_antenna(active_chains); + } + /* MIMO is not used here, but value is required */ + rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS; + rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; + rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; + rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; + scan->rx_chain = cpu_to_le16(rx_chain); + if (!priv->is_internal_short_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)); + } else { + cmd_len = iwl_fill_probe_req(priv, + (struct ieee80211_mgmt *)scan->data, + NULL, 0, + IWL_MAX_SCAN_SIZE - sizeof(*scan)); + + } + scan->tx_cmd.len = cpu_to_le16(cmd_len); + if (iwl_is_monitor_mode(priv)) + scan->filter_flags = RXON_FILTER_PROMISC_MSK; + + scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | + RXON_FILTER_BCON_AWARE_MSK); + + if (priv->is_internal_short_scan) { + scan->channel_count = + iwl_get_single_channel_for_scan(priv, band, + (void *)&scan->data[le16_to_cpu( + scan->tx_cmd.len)]); + } else { + scan->channel_count = + 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) { + IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); + goto done; + } + + cmd.len += le16_to_cpu(scan->tx_cmd.len) + + scan->channel_count * sizeof(struct iwl_scan_channel); + cmd.data = scan; + scan->len = cpu_to_le16(cmd.len); + + set_bit(STATUS_SCAN_HW, &priv->status); + if (iwl_send_cmd_sync(priv, &cmd)) + goto done; + + queue_delayed_work(priv->workqueue, &priv->scan_check, + IWL_SCAN_CHECK_WATCHDOG); + + return; + + done: + /* Cannot perform scan. Make sure we clear scanning + * bits from status so next scan request can be performed. + * If we don't clear scanning status bit here all next scan + * will fail + */ + clear_bit(STATUS_SCAN_HW, &priv->status); + clear_bit(STATUS_SCANNING, &priv->status); + /* inform mac80211 scan aborted */ + queue_work(priv->workqueue, &priv->scan_completed); +} |