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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: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-01-27 14:13:17 +01:00 committed by John W. Linville
parent ebefce3d13
commit 6d744bacee
2 changed files with 42 additions and 0 deletions
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25
include/net/ieee80211_radiotap.h
View File

@ -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. */

17
net/mac80211/rx.c
View File

@ -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;
}
}
/*