X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=carlfw%2Fsrc%2Fwlan.c;h=d3328d67e74a9be0a57cc467ce3af72548114e6c;hb=3ea9a05ea4197045ff042588b06f3a270db9b8a3;hp=50c48f9d27d5f440bb5e6a9d5c14eb1719cb7448;hpb=2bd700be49afc4c07cf45d0b537980e35322173b;p=carl9170fw.git

diff --git a/carlfw/src/wlan.c b/carlfw/src/wlan.c
index 50c48f9..d3328d6 100644
--- a/carlfw/src/wlan.c
+++ b/carlfw/src/wlan.c
@@ -345,6 +345,16 @@ static bool wlan_tx_status(struct dma_queue *queue,
 	/* update hangcheck */
 	fw.wlan.last_super_num[qidx] = 0;
 
+	/*
+	 * Note:
+	 * There could be a corner case when the TXFAIL is set
+	 * even though the frame was properly ACKed by the peer:
+	 *   a BlockAckReq with the immediate policy will cause
+	 *   the receiving peer to produce a BlockACK unfortunately
+	 *   the MAC in this chip seems to be expecting a legacy
+	 *   ACK and marks the BAR as failed!
+	 */
+
 	if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
 		txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
 
@@ -449,6 +459,10 @@ static bool wlan_tx_status(struct dma_queue *queue,
 
 	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();
@@ -483,6 +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;
@@ -554,10 +572,12 @@ static void wlan_send_buffered_ba(void)
 	baf->f.hdr.phy.mcs = AR9170_TXRX_PHY_RATE_OFDM_6M;
 
 	/* format outgoing BA */
-	ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_NULLFUNC);
+	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.
@@ -567,8 +587,8 @@ static void wlan_send_buffered_ba(void)
 	memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 
 	/*
-	 * NB:
-	 * not entirely sure if this is 100% correct?!
+	 * 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;
@@ -622,16 +642,9 @@ 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);
-
-	/*
-	 * NB:
-	 * not entirely sure if this is 100% correct to force the
-	 * imm ack bit or not...
-	 */
-	ctx->control = bar->control | cpu_to_le16(1);
+	memcpy(ctx->ra, bar->ra, 6);
+	memcpy(ctx->ta, bar->ta, 6);
+	ctx->control = bar->control;
 	ctx->start_seq_num = bar->start_seq_num;
 }
 
@@ -688,12 +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;