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mac80211: support (partial) VHT radiotap information

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Add some information that we have about VHT to radiotap.
This at least lets one see the MCS and NSS information.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
2012-11-22 23:00:18 +01:00
parent f2d9d270c1
commit 5164892184
4 changed files with 71 additions and 0 deletions
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40
net/mac80211/rx.c
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@@ -111,6 +111,11 @@ ieee80211_rx_radiotap_space(struct ieee80211_local *local,
len += 8;
}
if (status->flag & RX_FLAG_VHT) {
len = ALIGN(len, 2);
len += 12;
}
if (status->vendor_radiotap_len) {
if (WARN_ON_ONCE(status->vendor_radiotap_align == 0))
status->vendor_radiotap_align = 1;
@@ -297,6 +302,41 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
*pos++ = 0;
}
if (status->flag & RX_FLAG_VHT) {
u16 known = local->hw.radiotap_vht_details;
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
/* known field - how to handle 80+80? */
if (status->flag & RX_FLAG_80P80MHZ)
known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
put_unaligned_le16(known, pos);
pos += 2;
/* flags */
if (status->flag & RX_FLAG_SHORT_GI)
*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
pos++;
/* bandwidth */
if (status->flag & RX_FLAG_80MHZ)
*pos++ = 4;
else if (status->flag & RX_FLAG_80P80MHZ)
*pos++ = 0; /* marked not known above */
else if (status->flag & RX_FLAG_160MHZ)
*pos++ = 11;
else if (status->flag & RX_FLAG_40MHZ)
*pos++ = 1;
else /* 20 MHz */
*pos++ = 0;
/* MCS/NSS */
*pos = (status->rate_idx << 4) | status->vht_nss;
pos += 4;
/* coding field */
pos++;
/* group ID */
pos++;
/* partial_aid */
pos += 2;
}
if (status->vendor_radiotap_len) {
/* ensure 2 byte alignment for the vendor field as required */
if ((pos - (u8 *)rthdr) & 1)