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Commit 6d744bac authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
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mac80211: add MCS information to radiotap 



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

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent ebefce3d

include/net/ieee80211_radiotap.h

+25 −0
Original line number Diff line number Diff line
@@ -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. */

net/mac80211/rx.c

+17 −0
Original line number Diff line number Diff line
@@ -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;

	}

}



/*