mac80211: add MCS information to radiotap

This adds the MCS information we currently get
from the drivers into radiotap.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/net/ieee80211_radiotap.h b/include/net/ieee80211_radiotap.h
index af49f8ab7f8166de6c7b135e6296968ed094e0d1..b0be5fb9de19675ef765ec9e69ecde771b62a15b 100644 (file)
--- a/include/net/ieee80211_radiotap.h
+++ b/include/net/ieee80211_radiotap.h
@@ -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. */

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index f36d70f5b06279a99d0fec1dbdfa9474561691f2..7185c9316be2600d9dd37aef8a3071f5cab66d66 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -85,6 +85,9 @@ ieee80211_rx_radiotap_len(struct ieee80211_local *local,
        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 ieee80211_local *local,
                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;
+       }
 }
 
 /*