iwlwifi: implement txq invalidate byte count table

This is required to overcome a bug in 5000 HW byte count table.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -955,6 +955,26 @@ static void iwl5000_txq_update_byte_cnt_tbl(struct iwl_priv *priv,
 	}
 }
 
+static void iwl5000_txq_inval_byte_cnt_tbl(struct iwl_priv *priv,
+					   struct iwl_tx_queue *txq)
+{
+	int txq_id = txq->q.id;
+	struct iwl5000_shared *shared_data = priv->shared_virt;
+	u8 sta = 0;
+
+	if (txq_id != IWL_CMD_QUEUE_NUM)
+		sta = txq->cmd[txq->q.read_ptr].cmd.tx.sta_id;
+
+	shared_data->queues_byte_cnt_tbls[txq_id].tfd_offset[txq->q.read_ptr].
+					val = cpu_to_le16(1 | (sta << 12));
+
+	if (txq->q.write_ptr < IWL50_MAX_WIN_SIZE) {
+		shared_data->queues_byte_cnt_tbls[txq_id].
+			tfd_offset[IWL50_QUEUE_SIZE + txq->q.read_ptr].
+				val = cpu_to_le16(1 | (sta << 12));
+	}
+}
+
 static u16 iwl5000_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
 {
 	u16 size = (u16)sizeof(struct iwl_addsta_cmd);
@@ -1248,6 +1268,7 @@ static struct iwl_lib_ops iwl5000_lib = {
 	.free_shared_mem = iwl5000_free_shared_mem,
 	.shared_mem_rx_idx = iwl5000_shared_mem_rx_idx,
 	.txq_update_byte_cnt_tbl = iwl5000_txq_update_byte_cnt_tbl,
+	.txq_inval_byte_cnt_tbl = iwl5000_txq_inval_byte_cnt_tbl,
 	.txq_set_sched = iwl5000_txq_set_sched,
 	.rx_handler_setup = iwl5000_rx_handler_setup,
 	.is_valid_rtc_data_addr = iwl5000_hw_valid_rtc_data_addr,

drivers/net/wireless/iwlwifi/iwl-core.h

@@ -107,10 +107,12 @@ struct iwl_lib_ops {
 	void (*txq_update_byte_cnt_tbl)(struct iwl_priv *priv,
 					struct iwl_tx_queue *txq,
 					u16 byte_cnt);
+	void (*txq_inval_byte_cnt_tbl)(struct iwl_priv *priv,
+				       struct iwl_tx_queue *txq);
+	void (*txq_set_sched)(struct iwl_priv *priv, u32 mask);
 	/* setup Rx handler */
 	void (*rx_handler_setup)(struct iwl_priv *priv);
 	/* nic Tx fifo handling */
-	void (*txq_set_sched)(struct iwl_priv *priv, u32 mask);
 	/* alive notification after init uCode load */
 	void (*init_alive_start)(struct iwl_priv *priv);
 	/* alive notification */

drivers/net/wireless/iwlwifi/iwl-tx.c

@@ -1080,8 +1080,11 @@ int iwl_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
 		tx_info = &txq->txb[txq->q.read_ptr];
 		ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb[0]);
 		tx_info->skb[0] = NULL;
-		iwl_hw_txq_free_tfd(priv, txq);
 
+		if (priv->cfg->ops->lib->txq_inval_byte_cnt_tbl)
+			priv->cfg->ops->lib->txq_inval_byte_cnt_tbl(priv, txq);
+
+		iwl_hw_txq_free_tfd(priv, txq);
 		nfreed++;
 	}
 	return nfreed;