mac80211/drivers: rewrite the rate control API

So after the previous changes we were still unhappy with how
convoluted the API is and decided to make things simpler for
everybody. This completely changes the rate control API, now
taking into account 802.11n with MCS rates and more control,
most drivers don't support that though.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 19 insertions, 7 deletions

diff --git a/drivers/net/wireless/b43legacy/xmit.c b/drivers/net/wireless/b43legacy/xmit.c
index 65e833781608..12fca99f7578 100644
--- a/drivers/net/wireless/b43legacy/xmit.c
+++ b/drivers/net/wireless/b43legacy/xmit.c
@@ -188,7 +188,7 @@ static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
                                struct b43legacy_txhdr_fw3 *txhdr,
                                const unsigned char *fragment_data,
                                unsigned int fragment_len,
-                               const struct ieee80211_tx_info *info,
+                               struct ieee80211_tx_info *info,
                                u16 cookie)
 {
         const struct ieee80211_hdr *wlhdr;
@@ -201,6 +201,7 @@ static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
         u32 mac_ctl = 0;
         u16 phy_ctl = 0;
         struct ieee80211_rate *tx_rate;
+        struct ieee80211_tx_rate *rates;
 
         wlhdr = (const struct ieee80211_hdr *)fragment_data;
 
@@ -274,7 +275,7 @@ static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
         /* PHY TX Control word */
         if (rate_ofdm)
                 phy_ctl |= B43legacy_TX4_PHY_OFDM;
-        if (dev->short_preamble)
+        if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
                 phy_ctl |= B43legacy_TX4_PHY_SHORTPRMBL;
         switch (info->antenna_sel_tx) {
         case 0:
@@ -291,6 +292,7 @@ static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
         }
 
         /* MAC control */
+        rates = info->control.rates;
         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
                 mac_ctl |= B43legacy_TX4_MAC_ACK;
         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
@@ -299,12 +301,22 @@ static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
                 mac_ctl |= B43legacy_TX4_MAC_STMSDU;
         if (rate_fb_ofdm)
                 mac_ctl |= B43legacy_TX4_MAC_FALLBACKOFDM;
-        if (info->flags & IEEE80211_TX_CTL_LONG_RETRY_LIMIT)
+
+        /* Overwrite rates[0].count to make the retry calculation
+         * in the tx status easier. need the actual retry limit to
+         * detect whether the fallback rate was used.
+         */
+        if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
+            (rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) {
+                rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count;
                 mac_ctl |= B43legacy_TX4_MAC_LONGFRAME;
+        } else {
+                rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count;
+        }
 
         /* Generate the RTS or CTS-to-self frame */
-        if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
-            (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
+        if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
+            (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) {
                 unsigned int len;
                 struct ieee80211_hdr *hdr;
                 int rts_rate;
@@ -319,7 +331,7 @@ static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
                 if (rts_rate_fb_ofdm)
                         mac_ctl |= B43legacy_TX4_MAC_CTSFALLBACKOFDM;
 
-                if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT) {
+                if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
                         ieee80211_ctstoself_get(dev->wl->hw,
                                                 info->control.vif,
                                                 fragment_data,
@@ -362,7 +374,7 @@ int b43legacy_generate_txhdr(struct b43legacy_wldev *dev,
                               u8 *txhdr,
                               const unsigned char *fragment_data,
                               unsigned int fragment_len,
-                              const struct ieee80211_tx_info *info,
+                              struct ieee80211_tx_info *info,
                               u16 cookie)
 {
         return generate_txhdr_fw3(dev, (struct b43legacy_txhdr_fw3 *)txhdr,