Merge branch 'master' of git://github.com/chunkeey/carl9170fw

[carl9170fw.git] / carlfw / src / wlan.c

diff --git a/carlfw/src/wlan.c b/carlfw/src/wlan.c
index b8d4ec436fca3f54ed5708c80407c4b9fc75e4cb..d3328d67e74a9be0a57cc467ce3af72548114e6c 100644 (file)
--- a/carlfw/src/wlan.c
+++ b/carlfw/src/wlan.c
@@ -457,20 +457,12 @@ static bool wlan_tx_status(struct dma_queue *queue,
                fw.wlan.cab_queue_len[super->s.vif_id]--;
 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 
-       if (unlikely(ieee80211_is_back_req(super->f.data.i3e.frame_control))) {
-               /*
-                * As explained above, the hardware seems to be
-                * incapable of matching BA to BARs. This is a
-                * problem especially with mac80211, because it
-                * does resent failed BARs which of course cause
-                * some mayhem in the receiver buffer at the HT
-                * peer on the other end.
-                */
-               success = true;
-       }
-
        wlan_tx_complete(super, success);
 
+       if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) {
+               fw.wlan.queued_bar--;
+       }
+
        /* recycle freed descriptors */
        dma_reclaim(&fw.pta.down_queue, desc);
        down_trigger();
@@ -505,6 +497,10 @@ void __hot wlan_tx(struct dma_desc *desc)
 {
        struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
 
+       if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) {
+               fw.wlan.queued_bar++;
+       }
+
        /* initialize rate control struct */
        super->s.rix = 0;
        super->s.cnt = 1;
@@ -578,8 +574,10 @@ static void wlan_send_buffered_ba(void)
        /* format outgoing BA */
        ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
        ba->duration = cpu_to_le16(0);
-       memcpy(ba->ta, ctx->ta, 6);
-       memcpy(ba->ra, ctx->ra, 6);
+
+       /* the BAR contains all necessary MACs. All we need is to swap them */
+       memcpy(ba->ra, ctx->ta, 6);
+       memcpy(ba->ta, ctx->ra, 6);
 
        /*
         * Unfortunately, we cannot look into the hardware's scoreboard.
@@ -588,7 +586,11 @@ static void wlan_send_buffered_ba(void)
         */
        memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 
-       ba->control = ctx->control;
+       /*
+        * Both, the original firmare and ath9k set the NO ACK flag in
+        * the BA Ack Policy subfield.
+        */
+       ba->control = ctx->control | cpu_to_le16(1);
        ba->start_seq_num = ctx->start_seq_num;
        wlan_tx_fw(&baf->s, NULL);
 }
@@ -640,9 +642,8 @@ static void handle_bar(struct dma_desc *desc __unused, struct ieee80211_hdr *hdr
 
        ctx = wlan_get_bar_cache_buffer();
 
-       /* Brilliant! The BAR provides all necessary MACs! */
-       memcpy(ctx->ra, bar->ta, 6);
-       memcpy(ctx->ta, bar->ra, 6);
+       memcpy(ctx->ra, bar->ra, 6);
+       memcpy(ctx->ta, bar->ta, 6);
        ctx->control = bar->control;
        ctx->start_seq_num = bar->start_seq_num;
 }
@@ -700,12 +701,22 @@ static unsigned int wlan_rx_filter(struct dma_desc *desc)
                switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
                case IEEE80211_STYPE_BACK_REQ:
                        handle_bar(desc, hdr, data_len, mac_err);
-                       /* fallthrough */
                        rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
                        break;
                case IEEE80211_STYPE_PSPOLL:
                        rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
                        break;
+               case IEEE80211_STYPE_BACK:
+                       if (fw.wlan.queued_bar) {
+                               /*
+                                * Don't filter block acks when the application
+                                * has queued BARs. This is because the firmware
+                                * can't do the accouting and the application
+                                * has to sort out if the BA belongs to any BARs.
+                                */
+                               break;
+                       }
+                       /* otherwise fall through */
                default:
                        rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
                        break;