mac80211: propagate STBC / LDPC flags to radiotap

This capabilities weren't propagated to the radiotap header.
We don't set here the VHT_KNOWN / MCS_HAVE flag because not
all the low level drivers will know how to properly flag
the frames, hence the low level driver will be in charge
of setting IEEE80211_RADIOTAP_MCS_HAVE_FEC,
IEEE80211_RADIOTAP_MCS_HAVE_STBC and / or
IEEE80211_RADIOTAP_VHT_KNOWN_STBC according to its
capabilities.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 13 insertions, 0 deletions

diff --git a/include/net/ieee80211_radiotap.h b/include/net/ieee80211_radiotap.h
index 8b5b71433297..b0fd9476c538 100644
--- a/include/net/ieee80211_radiotap.h
+++ b/include/net/ieee80211_radiotap.h
@@ -316,6 +316,10 @@ enum ieee80211_radiotap_type {
 #define IEEE80211_RADIOTAP_VHT_FLAG_LDPC_EXTRA_OFDM_SYM         0x10
 #define IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED                  0x20
 
+#define IEEE80211_RADIOTAP_CODING_LDPC_USER0                    0x01
+#define IEEE80211_RADIOTAP_CODING_LDPC_USER1                    0x02
+#define IEEE80211_RADIOTAP_CODING_LDPC_USER2                    0x04
+#define IEEE80211_RADIOTAP_CODING_LDPC_USER3                    0x08
 
 /* helpers */
 static inline int ieee80211_get_radiotap_len(unsigned char *data)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index a119da52665f..4f0f29dce0aa 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -827,6 +827,7 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
  *      on this subframe
  * @RX_FLAG_AMPDU_DELIM_CRC_KNOWN: The delimiter CRC field is known (the CRC
  *      is stored in the @ampdu_delimiter_crc field)
+ * @RX_FLAG_LDPC: LDPC was used
  * @RX_FLAG_STBC_MASK: STBC 2 bit bitmask. 1 - Nss=1, 2 - Nss=2, 3 - Nss=3
  * @RX_FLAG_10MHZ: 10 MHz (half channel) was used
  * @RX_FLAG_5MHZ: 5 MHz (quarter channel) was used
@@ -863,6 +864,7 @@ enum mac80211_rx_flags {
         RX_FLAG_AMPDU_DELIM_CRC_KNOWN   = BIT(20),
         RX_FLAG_MACTIME_END             = BIT(21),
         RX_FLAG_VHT                     = BIT(22),
+        RX_FLAG_LDPC                    = BIT(23),
         RX_FLAG_STBC_MASK               = BIT(26) | BIT(27),
         RX_FLAG_10MHZ                   = BIT(28),
         RX_FLAG_5MHZ                    = BIT(29),
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index e81cab3ca157..593062109c50 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -279,6 +279,8 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
                         *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
                 if (status->flag & RX_FLAG_HT_GF)
                         *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
+                if (status->flag & RX_FLAG_LDPC)
+                        *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
                 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
                 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
                 pos++;
@@ -328,6 +330,9 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
                 /* flags */
                 if (status->flag & RX_FLAG_SHORT_GI)
                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
+                /* in VHT, STBC is binary */
+                if (status->flag & RX_FLAG_STBC_MASK)
+                        *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
                 pos++;
                 /* bandwidth */
                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
@@ -344,6 +349,8 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
                 *pos = (status->rate_idx << 4) | status->vht_nss;
                 pos += 4;
                 /* coding field */
+                if (status->flag & RX_FLAG_LDPC)
+                        *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
                 pos++;
                 /* group ID */
                 pos++;