mac80211: add LDPC encoding to ieee80211_parse_tx_radiotap

This patch adds support for LDPC encoding to the radiotap tx parse
function. Piror to this change adding the LDPC flag to the radiotap
header did not encode frames with LDPC.
Signed-off-by: Philipp Borgers <borgers@mi.fu-berlin.de>
Link: https://lore.kernel.org/r/20201219170710.11706-1-borgers@mi.fu-berlin.deSigned-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/tx.c

@@ -2120,6 +2120,10 @@ bool ieee80211_parse_tx_radiotap(struct sk_buff *skb,
 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
 			    mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
 				rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
+
+			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC &&
+			    mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC)
+				info->flags |= IEEE80211_TX_CTL_LDPC;
 			break;
 
 		case IEEE80211_RADIOTAP_VHT: