diff options
| -rw-r--r-- | include/linux/ieee80211.h | 2 | ||||
| -rw-r--r-- | include/net/mac80211.h | 6 | ||||
| -rw-r--r-- | net/mac80211/tx.c | 14 |
3 files changed, 21 insertions, 1 deletions
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h index f2965ff3d7c1..3b02f038d509 100644 --- a/include/linux/ieee80211.h +++ b/include/linux/ieee80211.h @@ -1705,6 +1705,8 @@ struct ieee80211_mcs_info { #define IEEE80211_HT_MCS_TX_MAX_STREAMS 4 #define IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION 0x10 +#define IEEE80211_HT_MCS_CHAINS(mcs) ((mcs) == 32 ? 1 : (1 + ((mcs) >> 3))) + /* * 802.11n D5.0 20.3.5 / 20.6 says: * - indices 0 to 7 and 32 are single spatial stream diff --git a/include/net/mac80211.h b/include/net/mac80211.h index d4ef2a605cb4..72375eceb786 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -1178,7 +1178,11 @@ struct ieee80211_tx_info { u8 use_cts_prot:1; u8 short_preamble:1; u8 skip_table:1; - /* 2 bytes free */ + + /* for injection only (bitmap) */ + u8 antennas:2; + + /* 14 bits free */ }; /* only needed before rate control */ unsigned long jiffies; diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 932516f8cc13..a984fc54644e 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -2162,6 +2162,11 @@ bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, rate_found = true; break; + case IEEE80211_RADIOTAP_ANTENNA: + /* this can appear multiple times, keep a bitmap */ + info->control.antennas |= BIT(*iterator.this_arg); + break; + case IEEE80211_RADIOTAP_DATA_RETRIES: rate_retries = *iterator.this_arg; break; @@ -2256,8 +2261,17 @@ bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, } if (rate_flags & IEEE80211_TX_RC_MCS) { + /* reset antennas if not enough */ + if (IEEE80211_HT_MCS_CHAINS(rate) > + hweight8(info->control.antennas)) + info->control.antennas = 0; + info->control.rates[0].idx = rate; } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { + /* reset antennas if not enough */ + if (vht_nss > hweight8(info->control.antennas)) + info->control.antennas = 0; + ieee80211_rate_set_vht(info->control.rates, vht_mcs, vht_nss); } else if (sband) { |