From: Johannes Berg <johannes.berg@xxxxxxxxx>
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@xxxxxxxxx>
---
include/net/ieee80211_radiotap.h | 24 ++++++++++++++++++++++++
include/net/mac80211.h | 5 +++++
net/mac80211/main.c | 2 ++
net/mac80211/rx.c | 40 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 71 insertions(+)
diff --git a/include/net/ieee80211_radiotap.h b/include/net/ieee80211_radiotap.h
index 7f0df13..c399963 100644
--- a/include/net/ieee80211_radiotap.h
+++ b/include/net/ieee80211_radiotap.h
@@ -186,6 +186,10 @@ struct ieee80211_radiotap_header {
* IEEE80211_RADIOTAP_AMPDU_STATUS u32, u16, u8, u8 unitless
*
* Contains the AMPDU information for the subframe.
+ *
+ * IEEE80211_RADIOTAP_VHT u16, u8, u8, u8[4], u8, u8, u16
+ *
+ * Contains VHT information about this frame.
*/
enum ieee80211_radiotap_type {
IEEE80211_RADIOTAP_TSFT = 0,
@@ -209,6 +213,7 @@ enum ieee80211_radiotap_type {
IEEE80211_RADIOTAP_MCS = 19,
IEEE80211_RADIOTAP_AMPDU_STATUS = 20,
+ IEEE80211_RADIOTAP_VHT = 21,
/* valid in every it_present bitmap, even vendor namespaces */
IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
@@ -282,6 +287,25 @@ enum ieee80211_radiotap_type {
#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR 0x0010
#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN 0x0020
+/* For IEEE80211_RADIOTAP_VHT */
+#define IEEE80211_RADIOTAP_VHT_KNOWN_STBC 0x0001
+#define IEEE80211_RADIOTAP_VHT_KNOWN_TXOP_PS_NA 0x0002
+#define IEEE80211_RADIOTAP_VHT_KNOWN_GI 0x0004
+#define IEEE80211_RADIOTAP_VHT_KNOWN_SGI_NSYM_DIS 0x0008
+#define IEEE80211_RADIOTAP_VHT_KNOWN_LDPC_EXTRA_OFDM_SYM 0x0010
+#define IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED 0x0020
+#define IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH 0x0040
+#define IEEE80211_RADIOTAP_VHT_KNOWN_GROUP_ID 0x0080
+#define IEEE80211_RADIOTAP_VHT_KNOWN_PARTIAL_AID 0x0100
+
+#define IEEE80211_RADIOTAP_VHT_FLAG_STBC 0x01
+#define IEEE80211_RADIOTAP_VHT_FLAG_TXOP_PS_NA 0x02
+#define IEEE80211_RADIOTAP_VHT_FLAG_SGI 0x04
+#define IEEE80211_RADIOTAP_VHT_FLAG_SGI_NSYM_M10_9 0x08
+#define IEEE80211_RADIOTAP_VHT_FLAG_LDPC_EXTRA_OFDM_SYM 0x10
+#define IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED 0x20
+
+
/* helpers */
static inline int ieee80211_get_radiotap_len(unsigned char *data)
{
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index db7680a..e806f1d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1473,6 +1473,10 @@ enum ieee80211_hw_flags {
* include _FMT. Use %IEEE80211_RADIOTAP_MCS_HAVE_* values, only
* adding _BW is supported today.
*
+ * @radiotap_vht_details: lists which VHT MCS information the HW reports,
+ * the default is _GI | _BANDWIDTH.
+ * Use the %IEEE80211_RADIOTAP_VHT_KNOWN_* values.
+ *
* @netdev_features: netdev features to be set in each netdev created
* from this HW. Note only HW checksum features are currently
* compatible with mac80211. Other feature bits will be rejected.
@@ -1499,6 +1503,7 @@ struct ieee80211_hw {
u8 max_tx_aggregation_subframes;
u8 offchannel_tx_hw_queue;
u8 radiotap_mcs_details;
+ u16 radiotap_vht_details;
netdev_features_t netdev_features;
};
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 6e93340..c4ed83b 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -638,6 +638,8 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
IEEE80211_RADIOTAP_MCS_HAVE_GI |
IEEE80211_RADIOTAP_MCS_HAVE_BW;
+ local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
+ IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 825f33c..9b13b8b 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -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)
--
1.8.0
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