mac80211: add radiotap MCS information From: Johannes Berg This adds the MCS information we currently get from the drivers into radiotap. Signed-off-by: Johannes Berg --- include/net/ieee80211_radiotap.h | 20 ++++++++++++++++++++ net/mac80211/rx.c | 17 +++++++++++++++++ 2 files changed, 37 insertions(+) --- wireless-testing.orig/net/mac80211/rx.c 2010-12-17 19:34:51.000000000 +0100 +++ wireless-testing/net/mac80211/rx.c 2010-12-18 18:46:22.000000000 +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 2010-10-27 07:42:08.000000000 +0200 +++ wireless-testing/include/net/ieee80211_radiotap.h 2010-12-18 18:39:14.000000000 +0100 @@ -199,6 +199,8 @@ 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 +247,24 @@ 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. */