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path: root/drivers/net/wireless/intel/iwlwifi/mvm/scan.c
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Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/mvm/scan.c')
-rw-r--r--drivers/net/wireless/intel/iwlwifi/mvm/scan.c216
1 files changed, 213 insertions, 3 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/scan.c b/drivers/net/wireless/intel/iwlwifi/mvm/scan.c
index 49ec515b5bad..a7ec172eeade 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/scan.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/scan.c
@@ -226,6 +226,14 @@ iwl_mvm_scan_type _iwl_mvm_get_scan_type(struct iwl_mvm *mvm,
.global_cnt = 0,
};
+ /*
+ * A scanning AP interface probably wants to generate a survey to do
+ * ACS (automatic channel selection).
+ * Force a non-fragmented scan in that case.
+ */
+ if (vif && ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_AP)
+ return IWL_SCAN_TYPE_WILD;
+
ieee80211_iterate_active_interfaces_atomic(mvm->hw,
IEEE80211_IFACE_ITER_NORMAL,
iwl_mvm_scan_iterator,
@@ -852,11 +860,13 @@ static inline bool iwl_mvm_scan_use_ebs(struct iwl_mvm *mvm,
* 4. it's not a p2p find operation.
* 5. we are not in low latency mode,
* or if fragmented ebs is supported by the FW
+ * 6. the VIF is not an AP interface (scan wants survey results)
*/
return ((capa->flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT) &&
mvm->last_ebs_successful && IWL_MVM_ENABLE_EBS &&
vif->type != NL80211_IFTYPE_P2P_DEVICE &&
- (!low_latency || iwl_mvm_is_frag_ebs_supported(mvm)));
+ (!low_latency || iwl_mvm_is_frag_ebs_supported(mvm)) &&
+ ieee80211_vif_type_p2p(vif) != NL80211_IFTYPE_AP);
}
static inline bool iwl_mvm_is_regular_scan(struct iwl_mvm_scan_params *params)
@@ -2124,7 +2134,8 @@ static u16 iwl_mvm_scan_umac_flags_v2(struct iwl_mvm *mvm,
static u8 iwl_mvm_scan_umac_flags2(struct iwl_mvm *mvm,
struct iwl_mvm_scan_params *params,
- struct ieee80211_vif *vif, int type)
+ struct ieee80211_vif *vif, int type,
+ u16 gen_flags)
{
u8 flags = 0;
@@ -2144,6 +2155,13 @@ static u8 iwl_mvm_scan_umac_flags2(struct iwl_mvm *mvm,
IWL_UCODE_TLV_CAPA_SCAN_DONT_TOGGLE_ANT))
flags |= IWL_UMAC_SCAN_GEN_PARAMS_FLAGS2_DONT_TOGGLE_ANT;
+ /* Passive and AP interface -> ACS (automatic channel selection) */
+ if (gen_flags & IWL_UMAC_SCAN_GEN_FLAGS_V2_FORCE_PASSIVE &&
+ ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_AP &&
+ iwl_fw_lookup_notif_ver(mvm->fw, SCAN_GROUP, CHANNEL_SURVEY_NOTIF,
+ 0) >= 1)
+ flags |= IWL_UMAC_SCAN_GEN_FLAGS2_COLLECT_CHANNEL_STATS;
+
return flags;
}
@@ -2513,7 +2531,8 @@ static int iwl_mvm_scan_umac_v14_and_above(struct iwl_mvm *mvm,
gen_flags = iwl_mvm_scan_umac_flags_v2(mvm, params, vif, type);
if (version >= 15)
- gen_flags2 = iwl_mvm_scan_umac_flags2(mvm, params, vif, type);
+ gen_flags2 = iwl_mvm_scan_umac_flags2(mvm, params, vif, type,
+ gen_flags);
else
gen_flags2 = 0;
@@ -3602,3 +3621,194 @@ int iwl_mvm_int_mlo_scan(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
return iwl_mvm_int_mlo_scan_start(mvm, vif, channels, n_channels);
}
+
+static int iwl_mvm_chanidx_from_phy(struct iwl_mvm *mvm,
+ enum nl80211_band band,
+ u16 phy_chan_num)
+{
+ struct ieee80211_supported_band *sband = mvm->hw->wiphy->bands[band];
+ int chan_idx;
+
+ if (WARN_ON_ONCE(!sband))
+ return -EINVAL;
+
+ for (chan_idx = 0; chan_idx < sband->n_channels; chan_idx++) {
+ struct ieee80211_channel *channel = &sband->channels[chan_idx];
+
+ if (channel->hw_value == phy_chan_num)
+ return chan_idx;
+ }
+
+ return -EINVAL;
+}
+
+static u32 iwl_mvm_div_by_db(u32 value, u8 db)
+{
+ /*
+ * 2^32 * 10**(i / 10) for i = [1, 10], skipping 0 and simply stopping
+ * at 10 dB and looping instead of using a much larger table.
+ *
+ * Using 64 bit math is overkill, but means the helper does not require
+ * a limit on the input range.
+ */
+ static const u32 db_to_val[] = {
+ 0xcb59185e, 0xa1866ba8, 0x804dce7a, 0x65ea59fe, 0x50f44d89,
+ 0x404de61f, 0x331426af, 0x2892c18b, 0x203a7e5b, 0x1999999a,
+ };
+
+ while (value && db > 0) {
+ u8 change = min_t(u8, db, ARRAY_SIZE(db_to_val));
+
+ value = (((u64)value) * db_to_val[change - 1]) >> 32;
+
+ db -= change;
+ }
+
+ return value;
+}
+
+VISIBLE_IF_IWLWIFI_KUNIT s8
+iwl_mvm_average_dbm_values(const struct iwl_umac_scan_channel_survey_notif *notif)
+{
+ s8 average_magnitude;
+ u32 average_factor;
+ s8 sum_magnitude = -128;
+ u32 sum_factor = 0;
+ int i, count = 0;
+
+ /*
+ * To properly average the decibel values (signal values given in dBm)
+ * we need to do the math in linear space. Doing a linear average of
+ * dB (dBm) values is a bit annoying though due to the large range of
+ * at least -10 to -110 dBm that will not fit into a 32 bit integer.
+ *
+ * A 64 bit integer should be sufficient, but then we still have the
+ * problem that there are no directly usable utility functions
+ * available.
+ *
+ * So, lets not deal with that and instead do much of the calculation
+ * with a 16.16 fixed point integer along with a base in dBm. 16.16 bit
+ * gives us plenty of head-room for adding up a few values and even
+ * doing some math on it. And the tail should be accurate enough too
+ * (1/2^16 is somewhere around -48 dB, so effectively zero).
+ *
+ * i.e. the real value of sum is:
+ * sum = sum_factor / 2^16 * 10^(sum_magnitude / 10) mW
+ *
+ * However, that does mean we need to be able to bring two values to
+ * a common base, so we need a helper for that.
+ *
+ * Note that this function takes an input with unsigned negative dBm
+ * values but returns a signed dBm (i.e. a negative value).
+ */
+
+ for (i = 0; i < ARRAY_SIZE(notif->noise); i++) {
+ s8 val_magnitude;
+ u32 val_factor;
+
+ if (notif->noise[i] == 0xff)
+ continue;
+
+ val_factor = 0x10000;
+ val_magnitude = -notif->noise[i];
+
+ if (val_magnitude <= sum_magnitude) {
+ u8 div_db = sum_magnitude - val_magnitude;
+
+ val_factor = iwl_mvm_div_by_db(val_factor, div_db);
+ val_magnitude = sum_magnitude;
+ } else {
+ u8 div_db = val_magnitude - sum_magnitude;
+
+ sum_factor = iwl_mvm_div_by_db(sum_factor, div_db);
+ sum_magnitude = val_magnitude;
+ }
+
+ sum_factor += val_factor;
+ count++;
+ }
+
+ /* No valid noise measurement, return a very high noise level */
+ if (count == 0)
+ return 0;
+
+ average_magnitude = sum_magnitude;
+ average_factor = sum_factor / count;
+
+ /*
+ * average_factor will be a number smaller than 1.0 (0x10000) at this
+ * point. What we need to do now is to adjust average_magnitude so that
+ * average_factor is between -0.5 dB and 0.5 dB.
+ *
+ * Just do -1 dB steps and find the point where
+ * -0.5 dB * -i dB = 0x10000 * 10^(-0.5/10) / i dB
+ * = div_by_db(0xe429, i)
+ * is smaller than average_factor.
+ */
+ for (i = 0; average_factor < iwl_mvm_div_by_db(0xe429, i); i++) {
+ /* nothing */
+ }
+
+ return average_magnitude - i;
+}
+EXPORT_SYMBOL_IF_IWLWIFI_KUNIT(iwl_mvm_average_dbm_values);
+
+void iwl_mvm_rx_channel_survey_notif(struct iwl_mvm *mvm,
+ struct iwl_rx_cmd_buffer *rxb)
+{
+ struct iwl_rx_packet *pkt = rxb_addr(rxb);
+ const struct iwl_umac_scan_channel_survey_notif *notif =
+ (void *)pkt->data;
+ struct iwl_mvm_acs_survey_channel *info;
+ enum nl80211_band band;
+ int chan_idx;
+
+ lockdep_assert_held(&mvm->mutex);
+
+ if (!mvm->acs_survey) {
+ size_t n_channels = 0;
+
+ for (band = 0; band < NUM_NL80211_BANDS; band++) {
+ if (!mvm->hw->wiphy->bands[band])
+ continue;
+
+ n_channels += mvm->hw->wiphy->bands[band]->n_channels;
+ }
+
+ mvm->acs_survey = kzalloc(struct_size(mvm->acs_survey,
+ channels, n_channels),
+ GFP_KERNEL);
+
+ if (!mvm->acs_survey)
+ return;
+
+ mvm->acs_survey->n_channels = n_channels;
+ n_channels = 0;
+ for (band = 0; band < NUM_NL80211_BANDS; band++) {
+ if (!mvm->hw->wiphy->bands[band])
+ continue;
+
+ mvm->acs_survey->bands[band] =
+ &mvm->acs_survey->channels[n_channels];
+ n_channels += mvm->hw->wiphy->bands[band]->n_channels;
+ }
+ }
+
+ band = iwl_mvm_nl80211_band_from_phy(le32_to_cpu(notif->band));
+ chan_idx = iwl_mvm_chanidx_from_phy(mvm, band,
+ le32_to_cpu(notif->channel));
+ if (WARN_ON_ONCE(chan_idx < 0))
+ return;
+
+ IWL_DEBUG_SCAN(mvm, "channel survey received for freq %d\n",
+ mvm->hw->wiphy->bands[band]->channels[chan_idx].center_freq);
+
+ info = &mvm->acs_survey->bands[band][chan_idx];
+
+ /* Times are all in ms */
+ info->time = le32_to_cpu(notif->active_time);
+ info->time_busy = le32_to_cpu(notif->busy_time);
+ info->time_rx = le32_to_cpu(notif->rx_time);
+ info->time_tx = le32_to_cpu(notif->tx_time);
+ info->noise = iwl_mvm_average_dbm_values(notif);
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-08-01 15:05:36 +0300