From: Johannes Berg <johannes.berg@xxxxxxxxx>
This adds the MCS information we currently get
from the drivers into radiotap.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
include/net/ieee80211_radiotap.h | 25 +++++++++++++++++++++++++
net/mac80211/rx.c | 17 +++++++++++++++++
2 files changed, 42 insertions(+)
--- wireless-testing.orig/net/mac80211/rx.c 2011-01-23 11:38:27.000000000 +0100
+++ wireless-testing/net/mac80211/rx.c 2011-01-27 14:10:46.000000000 +0100
@@ -85,6 +85,9 @@ ieee80211_rx_radiotap_len(struct ieee802
if (len & 1) /* padding for RX_FLAGS if necessary */
len++;
+ if (status->flag & RX_FLAG_HT) /* HT info */
+ len += 3;
+
return len;
}
@@ -193,6 +196,20 @@ ieee80211_add_rx_radiotap_header(struct
rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
put_unaligned_le16(rx_flags, pos);
pos += 2;
+
+ if (status->flag & RX_FLAG_HT) {
+ rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
+ *pos++ = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
+ IEEE80211_RADIOTAP_MCS_HAVE_GI |
+ IEEE80211_RADIOTAP_MCS_HAVE_BW;
+ *pos = 0;
+ if (status->flag & RX_FLAG_SHORT_GI)
+ *pos |= IEEE80211_RADIOTAP_MCS_SGI;
+ if (status->flag & RX_FLAG_40MHZ)
+ *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
+ pos++;
+ *pos++ = status->rate_idx;
+ }
}
/*
--- wireless-testing.orig/include/net/ieee80211_radiotap.h 2011-01-23 11:38:27.000000000 +0100
+++ wireless-testing/include/net/ieee80211_radiotap.h 2011-01-27 14:10:46.000000000 +0100
@@ -178,6 +178,11 @@ struct ieee80211_radiotap_header {
*
* Number of unicast retries a transmitted frame used.
*
+ * IEEE80211_RADIOTAP_MCS u8, u8, u8 unitless
+ *
+ * Contains a bitmap of known fields/flags, the flags, and
+ * the MCS index.
+ *
*/
enum ieee80211_radiotap_type {
IEEE80211_RADIOTAP_TSFT = 0,
@@ -199,6 +204,8 @@ enum ieee80211_radiotap_type {
IEEE80211_RADIOTAP_RTS_RETRIES = 16,
IEEE80211_RADIOTAP_DATA_RETRIES = 17,
+ IEEE80211_RADIOTAP_MCS = 19,
+
/* valid in every it_present bitmap, even vendor namespaces */
IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,
@@ -245,6 +252,24 @@ enum ieee80211_radiotap_type {
#define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */
#define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
+
+/* For IEEE80211_RADIOTAP_MCS */
+#define IEEE80211_RADIOTAP_MCS_HAVE_BW 0x01
+#define IEEE80211_RADIOTAP_MCS_HAVE_MCS 0x02
+#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_BW_MASK 0x03
+#define IEEE80211_RADIOTAP_MCS_BW_20 0
+#define IEEE80211_RADIOTAP_MCS_BW_40 1
+#define IEEE80211_RADIOTAP_MCS_BW_20L 2
+#define IEEE80211_RADIOTAP_MCS_BW_20U 3
+#define IEEE80211_RADIOTAP_MCS_SGI 0x04
+#define IEEE80211_RADIOTAP_MCS_FMT_GF 0x08
+#define IEEE80211_RADIOTAP_MCS_FEC_LDPC 0x10
+
+
/* Ugly macro to convert literal channel numbers into their mhz equivalents
* There are certianly some conditions that will break this (like feeding it '30')
* but they shouldn't arise since nothing talks on channel 30. */
--
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