[RFC 2/4] mac80211: add tx-power annotation in control path

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

This patch adds members to ieee80211_tx_info and ieee80211_sta_rates
structures to allow tx-power annotation per packet/per mrr stage.
The added members are always tx-power indices referring to the tx-power
set described by ieee80211_hw->txpower_ranges.

The annotation in ieee80211_tx_info is for probing and compatibility
reasons only, e.g. drivers that only support RC/TPC per packet and do
not yet use ieee80211_sta_rates.

Signed-off-by: Thomas Huehn <thomas.huehn@hs-nordhausen.de>
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
---
 include/net/mac80211.h | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 9612714d715f..659662f8b5dd 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1072,6 +1072,8 @@ ieee80211_rate_get_vht_nss(const struct ieee80211_tx_rate *rate)
  * @control.use_cts_prot: use RTS/CTS
  * @control.short_preamble: use short preamble (CCK only)
  * @control.skip_table: skip externally configured rate table
+ * @control.txpower_idx: Tx-power level index for whole packet,
+ * 	referring to an idx described by ieee80211_hw->txpower_ranges
  * @control.jiffies: timestamp for expiry on powersave clients
  * @control.vif: virtual interface (may be NULL)
  * @control.hw_key: key to encrypt with (may be NULL)
@@ -1120,7 +1122,8 @@ struct ieee80211_tx_info {
 					u8 use_cts_prot:1;
 					u8 short_preamble:1;
 					u8 skip_table:1;
-					/* 2 bytes free */
+					u8 txpower_idx;
+					/* 1 byte free */
 				};
 				/* only needed before rate control */
 				unsigned long jiffies;
@@ -1181,9 +1184,10 @@ ieee80211_info_get_tx_time_est(struct ieee80211_tx_info *info)
  *
  * @rate_idx The actual used rate.
  * @try_count How often the rate was tried.
- * @tx_power_idx An idx into the ieee80211_hw->tx_power_levels list of the
- * 	corresponding wifi hardware. The idx shall point to the power level
- * 	that was used when sending the packet.
+ * @tx_power_idx An idx into the the tx-power set described by
+ * 	ieee80211_hw->txpower_ranges for the corresponding wifi hardware.
+ * 	The idx shall point to the tx-power level that was used when sending
+ * 	the packet.
  */
 struct ieee80211_rate_status {
 	struct rate_info rate_idx;
@@ -2097,6 +2101,8 @@ enum ieee80211_sta_rx_bandwidth {
  * @rcu_head: RCU head used for freeing the table on update
  * @rate: transmit rates/flags to be used by default.
  *	Overriding entries per-packet is possible by using cb tx control.
+ * @rate.txpower_idx: An idx pointing to a tx-power level described by
+ * 	ieee80211_hw->txpower_ranges that should be used for the mrr stage.
  */
 struct ieee80211_sta_rates {
 	struct rcu_head rcu_head;
@@ -2106,6 +2112,7 @@ struct ieee80211_sta_rates {
 		u8 count_cts;
 		u8 count_rts;
 		u16 flags;
+		u8 txpower_idx;
 	} rate[IEEE80211_TX_RATE_TABLE_SIZE];
 };
 
-- 
2.30.2