mac80211: use rate index in TX control

This patch modifies struct ieee80211_tx_control to give band
info and the rate index (instead of rate pointers) to drivers.
This mostly serves to reduce the TX control structure size to
make it fit into skb->cb so that the fragmentation code can
put it there and we can think about passing it to drivers that
way in the future.

The rt2x00 driver update was done by Ivo, thanks.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 9 insertions, 16 deletions

diff --git a/net/mac80211/rate.h b/net/mac80211/rate.h
index 5b45f33cb766..a29148dcca99 100644
--- a/net/mac80211/rate.h
+++ b/net/mac80211/rate.h
@@ -19,14 +19,15 @@
 #include "ieee80211_i.h"
 #include "sta_info.h"
 
-/* TODO: kdoc */
+/**
+ * struct rate_selection - rate selection for rate control algos
+ * @rate: selected transmission rate index
+ * @nonerp: Non-ERP rate to use instead if ERP cannot be used
+ * @probe: rate for probing (or -1)
+ *
+ */
 struct rate_selection {
-        /* Selected transmission rate */
-        struct ieee80211_rate *rate;
-        /* Non-ERP rate to use if mac80211 decides it cannot use an ERP rate */
-        struct ieee80211_rate *nonerp;
-        /* probe with this rate, or NULL for no probing */
-        struct ieee80211_rate *probe;
+        s8 rate_idx, nonerp_idx, probe_idx;
 };
 
 struct rate_control_ops {
@@ -138,7 +139,7 @@ static inline int rate_supported(struct sta_info *sta,
         return (sta == NULL || sta->supp_rates[band] & BIT(index));
 }
 
-static inline int
+static inline s8
 rate_lowest_index(struct ieee80211_local *local,
                   struct ieee80211_supported_band *sband,
                   struct sta_info *sta)
@@ -155,14 +156,6 @@ rate_lowest_index(struct ieee80211_local *local,
         return 0;
 }
 
-static inline struct ieee80211_rate *
-rate_lowest(struct ieee80211_local *local,
-            struct ieee80211_supported_band *sband,
-            struct sta_info *sta)
-{
-        return &sband->bitrates[rate_lowest_index(local, sband, sta)];
-}
-
 
 /* functions for rate control related to a device */
 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,