Add rx flag to radiotap header which tells whether
Space-Time Block Code was used. At the moment only
1 stream STBC is supported.
TODO: Pass information from the driver on how many STBC
streams have been received.
Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@xxxxxxxxxxx>
---
include/net/ieee80211_radiotap.h | 6 ++++++
include/net/mac80211.h | 2 ++
net/mac80211/main.c | 3 ++-
net/mac80211/rx.c | 2 ++
4 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/include/net/ieee80211_radiotap.h b/include/net/ieee80211_radiotap.h
index e07d7d7..0254cbd 100644
--- a/include/net/ieee80211_radiotap.h
+++ b/include/net/ieee80211_radiotap.h
@@ -271,6 +271,7 @@ enum ieee80211_radiotap_type {
#define IEEE80211_RADIOTAP_MCS_HAVE_GI 0x04
#define IEEE80211_RADIOTAP_MCS_HAVE_FMT 0x08
#define IEEE80211_RADIOTAP_MCS_HAVE_FEC 0x10
+#define IEEE80211_RADIOTAP_MCS_HAVE_STBC 0x20
#define IEEE80211_RADIOTAP_MCS_BW_MASK 0x03
#define IEEE80211_RADIOTAP_MCS_BW_20 0
@@ -280,6 +281,11 @@ enum ieee80211_radiotap_type {
#define IEEE80211_RADIOTAP_MCS_SGI 0x04
#define IEEE80211_RADIOTAP_MCS_FMT_GF 0x08
#define IEEE80211_RADIOTAP_MCS_FEC_LDPC 0x10
+#define IEEE80211_RADIOTAP_MCS_STBC_MASK 0x60
+#define IEEE80211_RADIOTAP_MCS_STBC_0 0
+#define IEEE80211_RADIOTAP_MCS_STBC_1 1
+#define IEEE80211_RADIOTAP_MCS_STBC_2 2
+#define IEEE80211_RADIOTAP_MCS_STBC_3 3
/* For IEEE80211_RADIOTAP_AMPDU_STATUS */
#define IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN 0x0001
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 1fe1844..efa9fb1 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -808,6 +808,7 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
* on this subframe
* @RX_FLAG_AMPDU_DELIM_CRC_KNOWN: The delimiter CRC field is known (the CRC
* is stored in the @ampdu_delimiter_crc field)
+ * @RX_FLAG_STBC: Space-Time Block Code was used
*/
enum mac80211_rx_flags {
RX_FLAG_MMIC_ERROR = BIT(0),
@@ -835,6 +836,7 @@ enum mac80211_rx_flags {
RX_FLAG_80MHZ = BIT(23),
RX_FLAG_80P80MHZ = BIT(24),
RX_FLAG_160MHZ = BIT(25),
+ RX_FLAG_STBC = BIT(26),
};
/**
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 8a7bfc4..44191a3 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -589,7 +589,8 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
IEEE80211_RADIOTAP_MCS_HAVE_GI |
- IEEE80211_RADIOTAP_MCS_HAVE_BW;
+ IEEE80211_RADIOTAP_MCS_HAVE_BW |
+ IEEE80211_RADIOTAP_MCS_HAVE_STBC;
local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index c8447af..955a70f 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -267,6 +267,8 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
*pos |= IEEE80211_RADIOTAP_MCS_BW_40;
if (status->flag & RX_FLAG_HT_GF)
*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
+ if (status->flag & RX_FLAG_STBC)
+ *pos |= IEEE80211_RADIOTAP_MCS_STBC_1;
pos++;
*pos++ = status->rate_idx;
}
--
1.7.10.4
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