From: Felix Fietkau <nbd@openwrt.org>
Date: Tue, 16 Apr 2013 11:38:43 +0000 (+0200)
Subject: mac80211: fix CTS protection handling
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=991fec091061b901e4fdcc8af4fd25d24a5a7bab;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

mac80211: fix CTS protection handling

The rates[0] CTS and RTS flags are only set after rate control has been
called, so minstrel cannot use them to for setting the number of
retries. This patch adds two new flags to explicitly indicate RTS/CTS use.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 05dbb9788504..4f693a5c54de 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -655,7 +655,9 @@ struct ieee80211_tx_info {
 					struct ieee80211_tx_rate rates[
 						IEEE80211_TX_MAX_RATES];
 					s8 rts_cts_rate_idx;
-					/* 3 bytes free */
+					u8 use_rts:1;
+					u8 use_cts_prot:1;
+					/* 2 bytes free */
 				};
 				/* only needed before rate control */
 				unsigned long jiffies;
diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c
index 1c36c9b4fa4a..eda290fb8bd2 100644
--- a/net/mac80211/rc80211_minstrel.c
+++ b/net/mac80211/rc80211_minstrel.c
@@ -209,9 +209,9 @@ minstrel_get_retry_count(struct minstrel_rate *mr,
 {
 	unsigned int retry = mr->adjusted_retry_count;
 
-	if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
+	if (info->control.use_rts)
 		retry = max(2U, min(mr->retry_count_rtscts, retry));
-	else if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
+	else if (info->control.use_cts_prot)
 		retry = max(2U, min(mr->retry_count_cts, retry));
 	return retry;
 }
@@ -460,6 +460,8 @@ minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband,
 		} while ((tx_time < mp->segment_size) &&
 				(++mr->retry_count < mp->max_retry));
 		mr->adjusted_retry_count = mr->retry_count;
+		if (!(sband->bitrates[i].flags & IEEE80211_RATE_ERP_G))
+			mr->retry_count_cts = mr->retry_count;
 	}
 
 	for (i = n; i < sband->n_bitrates; i++) {
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 15c1b286e280..6ca857f8f424 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -656,6 +656,9 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
 		txrc.rts = rts = true;
 	}
 
+	info->control.use_rts = rts;
+	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
+
 	/*
 	 * Use short preamble if the BSS can handle it, but not for
 	 * management frames unless we know the receiver can handle
@@ -766,6 +769,11 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
 		 */
 		if (rc_rate->flags & IEEE80211_TX_RC_MCS) {
 			WARN_ON(rc_rate->idx > 76);
+
+			if (!(rc_rate->flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
+			    tx->sdata->vif.bss_conf.use_cts_prot)
+				rc_rate->flags |=
+					IEEE80211_TX_RC_USE_CTS_PROTECT;
 			continue;
 		}