mac80211: add multi-rate retry support

This patch adjusts the rate control API to allow multi-rate retry
if supported by the driver. The ieee80211_hw struct specifies how
many alternate rate selections the driver supports.

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

1 files changed, 7 insertions, 6 deletions

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index d7153bbcdb2b..1460537faf33 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -454,15 +454,16 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
                 if (unlikely(rsel.probe_idx >= 0)) {
                         info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
                         tx->flags |= IEEE80211_TX_PROBE_LAST_FRAG;
-                        info->control.alt_retry_rate_idx = tx->rate_idx;
+                        info->control.retries[0].rate_idx = tx->rate_idx;
+                        info->control.retries[0].limit = tx->local->hw.max_altrate_tries;
                         tx->rate_idx = rsel.probe_idx;
-                } else
-                        info->control.alt_retry_rate_idx = -1;
+                } else if (info->control.retries[0].limit == 0)
+                        info->control.retries[0].rate_idx = -1;
 
                 if (unlikely(tx->rate_idx < 0))
                         return TX_DROP;
         } else
-                info->control.alt_retry_rate_idx = -1;
+                info->control.retries[0].rate_idx = -1;
 
         if (tx->sdata->bss_conf.use_cts_prot &&
             (tx->flags & IEEE80211_TX_FRAGMENTED) && (rsel.nonerp_idx >= 0)) {
@@ -521,7 +522,7 @@ ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
                  * frames.
                  * TODO: The last fragment could still use multiple retry
                  * rates. */
-                info->control.alt_retry_rate_idx = -1;
+                info->control.retries[0].rate_idx = -1;
         }
 
         /* Use CTS protection for unicast frames sent using extended rates if
@@ -551,7 +552,7 @@ ieee80211_tx_h_misc(struct ieee80211_tx_data *tx)
                 int idx;
 
                 /* Do not use multiple retry rates when using RTS/CTS */
-                info->control.alt_retry_rate_idx = -1;
+                info->control.retries[0].rate_idx = -1;
 
                 /* Use min(data rate, max base rate) as CTS/RTS rate */
                 rate = &sband->bitrates[tx->rate_idx];