[RFC 4/4] mac80211: add utility function for tx_rate - rate_info conversion

[Jonas Jelonek <jelonek.jonas@gmail.com>]

This patch adds an utility function to mac80211 for conversion between
ieee80211_tx_rate (mac80211.h) and rate_info (cfg80211.h).

struct ieee80211_tx_rate is space limited to annotate rates up to IEEE
802.11ac. The new struct rate_info is able to annotate IEEE 802.11ax
rates and beyond. Several drivers internally still use ieee80211_tx_rate
but mac80211 expects rate_info in struct ieee80211_rate_status. This
struct is in turn required to allow, e.g., tx-power status report or
dynamic number of mrr stages.

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
---
 include/net/mac80211.h |  4 ++++
 net/mac80211/util.c    | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index ce3241313e06..cecba460a518 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1050,6 +1050,10 @@ ieee80211_rate_get_vht_nss(const struct ieee80211_tx_rate *rate)
 	return (rate->idx >> 4) + 1;
 }
 
+void ieee80211_rate_get_rate_info(const struct ieee80211_tx_rate *rate,
+				  struct wiphy *wiphy, u8 band,
+				  struct rate_info *rate_info);
+
 /**
  * struct ieee80211_tx_info - skb transmit information
  *
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index a292e63377c3..466d49ff8dcf 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -4870,3 +4870,38 @@ void ieee80211_fragment_element(struct sk_buff *skb, u8 *len_pos)
 
 	*len_pos = elem_len;
 }
+
+
+void ieee80211_rate_get_rate_info(const struct ieee80211_tx_rate *rate,
+				  struct wiphy *wiphy, u8 band,
+				  struct rate_info *rate_info)
+{
+	memset(rate_info, 0, sizeof(struct rate_info));
+
+	if (rate->flags & IEEE80211_TX_RC_MCS) { /* 802.11n */
+		rate_info->flags |= RATE_INFO_FLAGS_MCS;
+		rate_info->mcs = rate->idx;
+	} else if (rate->flags & IEEE80211_TX_RC_VHT_MCS) { /* 802.11ac */
+		rate_info->flags |= RATE_INFO_FLAGS_VHT_MCS;
+		rate_info->mcs = ieee80211_rate_get_vht_mcs(rate);
+		rate_info->nss = ieee80211_rate_get_vht_nss(rate);
+	} else { /* 802.11a/b/g */
+		rate_info->legacy = wiphy->bands[band]->bitrates[rate->idx].bitrate;
+		rate_info->bw = RATE_INFO_BW_20;
+		return;
+	}
+
+	if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+		rate_info->bw = RATE_INFO_BW_40;
+	else if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
+		rate_info->bw = RATE_INFO_BW_80;
+	else if (rate->flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
+		rate_info->bw = RATE_INFO_BW_160;
+	else
+		rate_info->bw = RATE_INFO_BW_20;
+
+	if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
+		rate_info->flags |= RATE_INFO_FLAGS_SHORT_GI;
+
+}
+EXPORT_SYMBOL(ieee80211_rate_get_rate_info);
-- 
2.30.2