Called from a work proc, this examines the last transmit rate change
to see if it warrants an event transmission.
Signed-off-by: Paul Stewart <pstew@xxxxxxxxxx>
---
net/mac80211/rate.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++
net/mac80211/rate.h | 8 +++++
2 files changed, 82 insertions(+), 0 deletions(-)
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index 4f772de..5e39494 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -399,3 +399,77 @@ void rate_control_deinitialize(struct ieee80211_local *local)
rate_control_put(ref);
}
+u32 ieee80211_rate_calculate(struct ieee80211_local *local,
+ struct ieee80211_if_managed *ifmgd)
+{
+ u32 rate_val;
+ u32 modulation, streams, base_rate, mcs, gi_div;
+ struct ieee80211_tx_rate *rate_ptr = &ifmgd->last_cqm_tx_rate;
+ struct ieee80211_supported_band *sband;
+ static int mod_table[8] = { 1, 2, 3, 4, 6, 8, 9, 10 };
+
+ if (!(rate_ptr->flags & IEEE80211_TX_RC_MCS)) {
+ sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+ return sband->bitrates[ifmgd->last_cqm_tx_rate.idx].bitrate;
+ }
+
+ mcs = rate_ptr->idx;
+
+ /* MCS values over 32 are not yet supported */
+ if (mcs >= 32)
+ return 0;
+
+ modulation = mcs & 7;
+ streams = (mcs >> 3) + 1;
+ base_rate = (rate_ptr->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ?
+ 13500000 : 6500000;
+ gi_div = (rate_ptr->flags & IEEE80211_TX_RC_SHORT_GI) ? 9 : 10;
+ rate_val = base_rate * mod_table[modulation] * streams / gi_div;
+
+ return ((rate_val + 5000) / 10000) * 100;
+}
+
+void ieee80211_cqm_bitrate_notify(struct ieee80211_local *local)
+{
+ struct ieee80211_sub_if_data *sdata;
+ struct ieee80211_if_managed *ifmgd;
+ struct ieee80211_bss_conf *bss_conf;
+ u32 bitrate, threshold;
+ int prev_state, new_state;
+
+ WARN_ON(!mutex_is_locked(&local->iflist_mtx));
+
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ if (!netif_running(sdata->dev) ||
+ sdata->vif.type != NL80211_IFTYPE_STATION)
+ continue;
+
+ ifmgd = &sdata->u.mgd;
+ bss_conf = &sdata->vif.bss_conf;
+
+ if (!(ifmgd->flags & IEEE80211_STA_TX_RATE_CHANGED) ||
+ bss_conf->cqm_bitrate_thold == 0)
+ continue;
+
+ bitrate = ieee80211_rate_calculate(local, ifmgd);
+ threshold = bss_conf->cqm_bitrate_thold;
+ prev_state = (ifmgd->last_cqm_bitrate < threshold);
+ new_state = (bitrate < threshold);
+
+ /*
+ * Trigger a bitrate notification if one of the following is
+ * true:
+ * - We haven't sent one since the threshold was reconfigured
+ * - We have crossed the threshold in either direction
+ * - We are below threshold, and the bitrate has decreased yet
+ * again.
+ */
+ if (ifmgd->last_cqm_bitrate == 0 || prev_state != new_state ||
+ (new_state && bitrate < ifmgd->last_cqm_bitrate)) {
+ cfg80211_cqm_bitrate_notify(sdata->dev, bitrate,
+ GFP_KERNEL);
+ ifmgd->last_cqm_bitrate = bitrate;
+ }
+ ifmgd->flags &= ~IEEE80211_STA_TX_RATE_CHANGED;
+ }
+}
diff --git a/net/mac80211/rate.h b/net/mac80211/rate.h
index 168427b..33e4ca3 100644
--- a/net/mac80211/rate.h
+++ b/net/mac80211/rate.h
@@ -120,6 +120,14 @@ int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
void rate_control_deinitialize(struct ieee80211_local *local);
+/* Notify listeners about transmit rate changes */
+void ieee80211_cqm_bitrate_notify(struct ieee80211_local *local);
+
+/* Convert rate into cfg80211-compatible struct? */
+void ieee80211_rate_convert_cfg(struct ieee80211_local *local,
+ struct ieee80211_if_managed *ifmgd,
+ struct rate_info *rate);
+
/* Rate control algorithms */
#ifdef CONFIG_MAC80211_RC_PID
extern int rc80211_pid_init(void);
--
1.7.1
--
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