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authorFelix Fietkau <nbd@nbd.name>2016-06-29 10:44:39 +0200
committerFelix Fietkau <nbd@nbd.name>2016-07-02 19:34:50 +0200
commitd002aee42c4894b19eab811f1b7c158d0d435ba7 (patch)
tree1172c7ef6b81140fa352619fd792cc40f07d205d /package/kernel/mac80211
parent898fff8253599c16df0d4a312784ee5158e5629d (diff)
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mac80211: enable STBC and LDPC for VHT rates
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'package/kernel/mac80211')
-rw-r--r--package/kernel/mac80211/patches/310-mac80211-minstrel-Enable-STBC-and-LDPC-for-VHT-Rates.patch81
1 files changed, 81 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/310-mac80211-minstrel-Enable-STBC-and-LDPC-for-VHT-Rates.patch b/package/kernel/mac80211/patches/310-mac80211-minstrel-Enable-STBC-and-LDPC-for-VHT-Rates.patch
new file mode 100644
index 0000000000..25929c9813
--- /dev/null
+++ b/package/kernel/mac80211/patches/310-mac80211-minstrel-Enable-STBC-and-LDPC-for-VHT-Rates.patch
@@ -0,0 +1,81 @@
+From: Chaitanya T K <chaitanya.mgit@gmail.com>
+Date: Mon, 27 Jun 2016 15:23:26 +0530
+Subject: [PATCH] mac80211: minstrel: Enable STBC and LDPC for VHT Rates
+
+If peer support reception of STBC and LDPC, enable them for better
+performance.
+
+Signed-off-by: Chaitanya TK <chaitanya.mgit@gmail.com>
+---
+
+--- a/include/linux/ieee80211.h
++++ b/include/linux/ieee80211.h
+@@ -1550,6 +1550,7 @@ struct ieee80211_vht_operation {
+ #define IEEE80211_VHT_CAP_RXSTBC_3 0x00000300
+ #define IEEE80211_VHT_CAP_RXSTBC_4 0x00000400
+ #define IEEE80211_VHT_CAP_RXSTBC_MASK 0x00000700
++#define IEEE80211_VHT_CAP_RXSTBC_SHIFT 8
+ #define IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE 0x00000800
+ #define IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE 0x00001000
+ #define IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT 13
+--- a/net/mac80211/rc80211_minstrel_ht.c
++++ b/net/mac80211/rc80211_minstrel_ht.c
+@@ -1166,13 +1166,14 @@ minstrel_ht_update_caps(void *priv, stru
+ struct minstrel_ht_sta_priv *msp = priv_sta;
+ struct minstrel_ht_sta *mi = &msp->ht;
+ struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
+- u16 sta_cap = sta->ht_cap.cap;
++ u16 ht_cap = sta->ht_cap.cap;
+ struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
+ int use_vht;
+ int n_supported = 0;
+ int ack_dur;
+ int stbc;
+ int i;
++ bool ldpc = false;
+
+ /* fall back to the old minstrel for legacy stations */
+ if (!sta->ht_cap.ht_supported)
+@@ -1210,16 +1211,24 @@ minstrel_ht_update_caps(void *priv, stru
+ }
+ mi->sample_tries = 4;
+
+- /* TODO tx_flags for vht - ATM the RC API is not fine-grained enough */
+ if (!use_vht) {
+- stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >>
++ stbc = (ht_cap & IEEE80211_HT_CAP_RX_STBC) >>
+ IEEE80211_HT_CAP_RX_STBC_SHIFT;
+- mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT;
+
+- if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING)
+- mi->tx_flags |= IEEE80211_TX_CTL_LDPC;
++ if (ht_cap & IEEE80211_HT_CAP_LDPC_CODING)
++ ldpc = true;
++ } else {
++ stbc = (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK) >>
++ IEEE80211_VHT_CAP_RXSTBC_SHIFT;
++
++ if (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)
++ ldpc = true;
+ }
+
++ mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT;
++ if (ldpc)
++ mi->tx_flags |= IEEE80211_TX_CTL_LDPC;
++
+ for (i = 0; i < ARRAY_SIZE(mi->groups); i++) {
+ u32 gflags = minstrel_mcs_groups[i].flags;
+ int bw, nss;
+@@ -1232,10 +1241,10 @@ minstrel_ht_update_caps(void *priv, stru
+
+ if (gflags & IEEE80211_TX_RC_SHORT_GI) {
+ if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
+- if (!(sta_cap & IEEE80211_HT_CAP_SGI_40))
++ if (!(ht_cap & IEEE80211_HT_CAP_SGI_40))
+ continue;
+ } else {
+- if (!(sta_cap & IEEE80211_HT_CAP_SGI_20))
++ if (!(ht_cap & IEEE80211_HT_CAP_SGI_20))
+ continue;
+ }
+ }